METHOD AND APPARATUS FOR HARQ-ACK INFORMATION BIT GENERATION AND ORDERINGTECHNICAL FIELDEmbodiments of the present disclosure generally relate to wireless communication technology, and more particularly to the generation and ordering of hybrid automatic repeat request acknowledgement (HARQ-ACK) information bits.
BACKGROUNDA wireless communication system may include one or multiple network communication devices, such as base stations, which may support wireless communication for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology. The wireless communication system may support wireless communication with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like) . Additionally, the wireless communication system may support wireless communication across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) (which is also known as new radio (NR) ) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .
In a wireless communication system, a base station (BS) and a UE may communicate via downlink (DL) channels and uplink (UL) channels. For example, a UE may monitor a physical downlink control channel (PDCCH) in one or more search spaces. The PDCCH may carry downlink control information (DCI) , which may schedule uplink channels, such as a physical uplink shared channel (PUSCH) , or downlink channels, such as a physical downlink shared channel (PDSCH) . The UE may transmit HARQ-ACK feedback (e.g., HARQ-ACK information bit (s) ) for the scheduled PDSCH to the BS.
Carrier aggregation (CA) technology may be used in a wireless communication system to, for example, increase data rates. For example, CA technology may refer to aggregating spectrum resources (e.g., carriers or cells) from the same frequency band or different frequency bands. In a CA scenario, multiple cells may be configured for a UE and DL or UL channels may be carried on one or more cells of the multiple cells.
The industry desires technologies for handling HARQ-ACK feedback determination, generation and ordering in a CA scenario.
SUMMARYAn article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” or “one or both of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. ” Further, as used herein, including in the claims, a “set” may include one or more elements.
Some embodiments of the present disclosure provide a UE. The UE may include at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: receive, from a BS, a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for the UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells; determine the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs; order the HARQ-ACK information bits corresponding to the plurality of PDSCHs; and transmit, to the BS, the ordered HARQ-ACK information bits.
Some embodiments of the present disclosure provide a processor. The processor may include at least one controller coupled with at least one memory and configured to cause the processor to: receive, from a BS, a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for a UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells; determine the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs; order the HARQ-ACK information bits corresponding to the plurality of PDSCHs; and transmit, to the BS, the ordered HARQ-ACK information bits.
Some embodiments of the present disclosure provide a BS. The BS may include: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the BS to: transmit, to a UE, a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for the UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells; determine the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs and bit positions of the HARQ-ACK information bits corresponding to the plurality of PDSCHs; and receive the HARQ-ACK information bits corresponding to the plurality of PDSCHs.
Some embodiments of the present disclosure provide a method for wireless communication. The method may include: receiving, from a BS, a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for a UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells; determining the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs; ordering the HARQ-ACK information bits corresponding to the plurality of PDSCHs; and transmitting, to the BS, the ordered HARQ-ACK information bits.
Some embodiments of the present disclosure provide an apparatus. According to some embodiments of the present disclosure, the apparatus may include: at least one non-transitory computer-readable medium having stored thereon computer-executable instructions; at least one receiving circuitry; at least one transmitting circuitry; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry and the at least one transmitting circuitry, wherein the at least one non-transitory computer-readable medium and the computer executable instructions may be configured to, with the at least one processor, cause the apparatus to perform a method according to some embodiments of the present disclosure.
BRIEF DESCRIPTION OF THE DRAWINGSIn order to describe the manner in which the advantages and features of the disclosure can be obtained, a description of the disclosure is rendered by reference to specific embodiments thereof, which are illustrated in the appended drawings. These drawings depict only exemplary embodiments of the disclosure and are not therefore to be considered limiting of its scope.
FIG. 1 illustrates a schematic diagram of a wireless communication system in accordance with some embodiments of the present disclosure;
FIGs. 2-4 illustrate schematic diagrams of a DCI format scheduling a plurality of PDSCHs in accordance with some embodiments of the present disclosure;
FIGs. 5 and 6 illustrate flowcharts of methods for wireless communication in accordance with some embodiments of the present disclosure;
FIG. 7 illustrates a block diagram of an exemplary apparatus in accordance with some embodiments of the present disclosure;
FIG. 8 illustrates an example of a UE in accordance with some embodiments of the present disclosure;
FIG. 9 illustrates an example of a processor in accordance with some embodiments of the present disclosure; and
FIG. 10 illustrates an example of a network equipment (NE) in accordance with some embodiments of the present disclosure.
DETAILED DESCRIPTIONThe detailed description of the appended drawings is intended as a description of the preferred embodiments of the present disclosure and is not intended to represent the only form in which the present disclosure may be practiced. It should be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the present disclosure.
Reference will now be made in detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. To facilitate understanding, embodiments are provided under a specific network architecture (s) and new service scenarios, such as the 3rd generation partnership project (3GPP) 5G NR or 6G, 3GPP LTE, and so on. It is contemplated that along with the developments of network architectures and new service scenarios, all embodiments in the present disclosure are also applicable to similar technical problems; and moreover, the terminologies recited in the present disclosure may change, which should not affect the principles of the present disclosure.
Currently, in a communication system, a single DCI format can schedule a single PDSCH or PUSCH on a single cell, or can schedule one or multiple PDSCHs or PUSCHs on a single cell, or can schedule a single PDSCH or PUSCH on one or multiple cells. These scheduling mechanisms have drawbacks, such as requiring much signaling overhead and not being able to exploit the scheduling benefit from FR1 to FR2.
It would be beneficial if a single DCI can schedule a plurality of cells with one or multiple PDSCHs or PUSCHs per cell. Various issues may need to be addressed when such scheduling mechanism is supported. For example, the UE and the BS may have different understandings of the size or the ordering of the HARQ-ACK information bits for the PDSCHs or PUSCHs scheduled by the DCI. The present disclosure provides solutions to solve these issues while supporting such scheduling mechanism. The solutions thus provided ensure that the HARQ-ACK information bits for the scheduled PDSCHs are correctly generated and ordered, thereby synchronizing the understanding of the HARQ-ACK information bits at the UE and the BS.
FIG. 1 illustrates a schematic diagram of wireless communication system 100 in accordance with some embodiments of the present disclosure.
The wireless communication system 100 may include one or more NEs 102 (e.g., one or more BSs) , one or more UEs 104, and a core network (CN) 106. The wireless communication system 100 may support various radio access technologies. In some implementations, the wireless communication system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network. In some other implementations, the wireless communication system 100 may be a NR network, such as a 5G network, a 5G-Advanced (5G-A) network, or a 5G ultra-wideband (5G-UWB) network. In other implementations, the wireless communication system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , and IEEE 802.20. The wireless communication system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communication system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
The one or more NEs 102 may be dispersed throughout a geographic region to form the wireless communication system 100. One or more of the NEs 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a network function, a network entity, a radio access network (RAN) , a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless or wired connection. For example, an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area. For example, an NE 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN) . In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas may be associated with a different NE 102.
The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communication system 100. A UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, a receiver device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples.
A UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link 114 may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
An NE 102 may support communication with the CN 106, or with another NE 102, or both. For example, an NE 102 may interface with another NE 102 or the CN 106 through one or more backhaul links (e.g., S1, N2, N2, or network interface) . In some implementations, the NE 102 may communicate with each other directly. In some other implementations, the NE 102 may communicate with each other or indirectly (e.g., via the CN 106. In some implementations, one or more NEs 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as radio heads, smart radio heads, or transmission-reception points (TRPs) .
The CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The CN 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more NEs 102 associated with the CN 106.
The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an S1, N2, N2, or another network interface) . The packet data network may include an application server. In some implementations, one or more UEs 104 may communicate with the application server. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102. The CN 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server using the established session (e.g., the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the CN 106 (e.g., one or more network functions of the CN 106) .
In the wireless communication system 100, the NEs 102 and the UEs 104 may use resources of the wireless communication system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communication) . In some implementations, the NEs 102 and the UEs 104 may support different resource structures. For example, the NEs 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the NEs 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the NEs 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.
One or more numerologies may be supported in the wireless communication system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.
A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.
Additionally or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communication system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., orthogonal frequency-division multiplexing (OFDM) symbols) . In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.
In the wireless communication system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communication system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the NEs 102 and the UEs 104 may perform wireless communication over one or more of the operating frequency bands. In some implementations, FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communication traffic (e.g., control information, data) . In some implementations, FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g., μ =0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g., μ =1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., μ=3) , which includes 120 kHz subcarrier spacing.
A UE 104 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like. According to some embodiments of the present disclosure, a UE 104 may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network. In some embodiments of the present disclosure, a UE 104 includes wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like. Moreover, a UE 104 may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art. A UE 104 may communicate with an NE 102 (e.g., a BS) via uplink (UL) communication signals. An NE 102 may communicate with a UE 104 via downlink (DL) communication signals.
In some embodiments of the present disclosure, an NE 102 and a UE 104 may communicate over licensed spectrums, whereas in some other embodiments, an NE 102 and a UE 104 may communicate over unlicensed spectrums. The present disclosure is not intended to be limited to the implementation of any particular wireless communication system architecture or protocol.
In some embodiments of the present disclosure, the wireless communication system 100 may be designed to support a maximum of 16 component carriers (CCs) in the case of carrier aggregation (CA) or a maximum of 32 CCs in the case of dual connectivity (DC) . In some embodiments of the present disclosure, in the case of CA, one DCI format can schedule at most one cell (e.g., carrier) by cross-cell (or cross-carrier) scheduling or self-scheduling. This requires much signaling overhead for PDCCHs to schedule DL transmissions (e.g., PDSCHs) or UL transmissions (e.g., PUSCHs) when the number of cells configured for a UE is large. To reduce signaling overhead, it would be beneficial to use a single DCI format to schedule multiple PDSCHs or PUSCHs on multiple cells (or carriers) configured for the UE. In the context of the present disclosure, the term "cell" may be used interchangeably with the term "carrier. "
In some embodiments of the present disclosure, a single DCI can schedule at most 4 cells with one PDSCH or one PUSCH per cell. However, it is important to acknowledge that such scheduling scheme has a certain restriction. For example, when one cell (e.g., the DCI is transmitted on this scheduling cell) in FR1 schedules multiple cells (e.g., the PDSCHs or PUSCHs are transmitted on these scheduled cells) in FR2, a slot in the scheduling cell may be, for example, 4 or 8 times longer than a slot in scheduled cells, such that a majority of the slots on scheduled cells cannot be scheduled.
FIG. 2 illustrates a schematic diagram of a DCI format scheduling a plurality of PDSCHs in accordance with some embodiments of the present disclosure.
In some embodiments of the present disclosure, a plurality of cells (e.g., including but not limited to CCs 231-234 in FIG. 2) may be configured for a UE by a BS. Each of the plurality of CCs may correspond to a respective cell (e.g., serving cell) or carrier of the UE. Each cell (serving cell) may be associated with a (serving) cell index. The sub-carrier spacing (SCS) of CCs 231-234 may be different. For example, CC 231 may be on FR1 with a 15kHz SCS and CCs 232-234 may be on FR2 with 120kHz SCS. Therefore, one slot on CC 231 (e.g., slot 0 on CC 231 as shown in FIG. 2) may occupy 1ms and eight slots on each of CCs 232-234 (e.g., slot 0 to slot 7 on CCs 232-234 as shown in FIG. 2) may occupy 1ms.
A BS may transmit a single DCI format to schedule a plurality of PDSCHs on a plurality of cells. For example, DCI format 211 on CC 231 may schedule a single PDSCH on each of CCs 232-234. For example, as shown in FIG. 2, each of PDSCHs 221-223 may be scheduled in a single slot (e.g., slot 5) on each of CCs 232-234. However, the remaining 7 slots (e.g., slot 0 to slot 4, slot 6 and slot 7) cannot be scheduled within the 1ms duration due to different SCSs among the scheduled cells and scheduling cell. As a result, performance will be greatly degraded.
In some embodiments of the present disclosure, to fully exploit the scheduling benefit from FR1 to FR2, a single DCI can schedule a plurality of cells with one or multiple PDSCHs or PUSCHs per cell. In this way, all the slots on the scheduled cells can be scheduled. For example, referring to FIG. 2, DCI 211 can schedule a PDSCH in each of slot 0 to slot 7 on CC 232. However, various issues can arise when a single DCI schedules a plurality of cells with one or multiple PDSCHs or PUSCHs per cell.
For example, when a UE is configured to monitor a DCI format scheduling a plurality of PDSCHs on one or multiple cells with one or multiple PDSCHs per cell, one issue is how to determine the HARQ-ACK information bit ordering among HARQ-ACK information bits for the plurality of PDSCHs scheduled by the single DCI format.
FIG. 3 illustrates a schematic diagram of a DCI format scheduling a plurality of PDSCHs in accordance with some embodiments of the present disclosure. In some embodiments of the present disclosure, a plurality of cells (e.g., including but not limited to CCs 331-333 in FIG. 3) may be configured for a UE by a BS. Each of the plurality of CCs may correspond to a respective cell (e.g., serving cell) or carrier of the UE. Each cell (serving cell) may be associated with a (serving) cell index.
As shown in FIG. 3, DCI format 311 on CC 331 may schedule a plurality of PDSCHs (e.g., PDSCHs 321-326) on a plurality of cells (e.g., CCs 331-333) . How to order the HARQ-ACK information bits for PDSCHs 321-326 needs to be resolved. Otherwise, the HARQ-ACK codebook may be mismatched between the UE and the BS. That is, the HARQ-ACK codebook comprising the HARQ-ACK information bits for PDSCHs 321-326 generated by the UE may not match what the BS expects.
When a plurality of PDSCHs is co-scheduled by a single DCI on a plurality of cells having different SCSs, the problem of HARQ-ACK information bit ordering may become more complicated.
FIG. 4 illustrates a schematic diagram of a DCI format scheduling a plurality of PDSCHs in accordance with some embodiments of the present disclosure. In some embodiments of the present disclosure, a plurality of cells (e.g., including but not limited to CCs 431-433 in FIG. 4) may be configured for a UE. Each of the plurality of CCs may correspond to a respective cell (e.g., serving cell) or carrier of the UE. Each cell (serving cell) may be associated with a (serving) cell index.
The SCSs of CCs 431-433 may be different. For example, CC 431 may use 15kHz SCS, CC 432 may use 30kHz SCS and CC 433 may use 60kHz SCS. As shown in FIG. 4, DCI format 411 on CC 431 may schedule a plurality of PDSCHs (e.g., PDSCHs 421-427) on a plurality of cells (e.g., CCs 431-433) . How to order the HARQ-ACK information bits for PDSCHs 421-427 needs to be resolved.
Another issue is how to determine the number of HARQ-ACK information bits when a UE is configured to monitor a DCI format scheduling a plurality of PDSCHs on one or multiple cells with one or multiple PDSCHs per cell. This issue emerges because when a UE misses a DCI format for scheduling a plurality of PDSCHs on one or multiple cells, the UE cannot know how many PDSCHs are scheduled by the BS for the UE. In this sense, the HARQ-ACK codebook may be mismatched between the UE and the BS. That is, the HARQ-ACK codebook comprising the HARQ-ACK information bits for the scheduled PDSCHs generated by the UE may not match what the BS expects.
Embodiments of the present disclosure propose solutions for solving the above issues. For example, methods for generating HARQ-ACK information bits for PDSCHs co-scheduled by a single DCI format are provided. For example, methods for determining the number of HARQ-ACK information bits for PDSCHs co-scheduled by a single DCI format are provided. For example, methods for ordering HARQ-ACK information bits for PDSCHs co-scheduled by a single DCI format are provided. More details on the embodiments of the present disclosure will be illustrated in the following text in combination with the appended drawings.
In some embodiments of the present disclosure, a BS may configure, for a UE, a set of cells (denoted as cell set #1) which can be used for multi-cell scheduling. For example, the BS may transmit a configuration of cells in cell set #1 to the UE. The BS may transmit, to the UE, a DCI format (denoted as DCI #A) for scheduling a plurality of PDSCHs on one or more cells (denoted as cell set #2) among cell set #1, wherein DCI #A may schedule one or more PDSCHs among the plurality of PDSCHs on each cell of cell set #2.
Various methods can be employed for determining the number of HARQ-ACK information bits (denoted as X) corresponding to the plurality of PDSCHs co-scheduled by DCI #A. The UE may generate HARQ-ACK information bits for the plurality of PDSCHs co-scheduled by DCI #A, and then add padding bits (if necessary) based on the value of X. For example, the UE may transmit X HARQ-ACK information bits to the BS for the plurality of PDSCHs co-scheduled by DCI #A.
In some embodiments of the present disclosure, the value of X may be dependent on the maximum payload size of a DCI format. For example, the payload size of a DCI format cannot exceed 140 bits without a 24-bit CRC. The possible values of X can include 4, 8, 12, 16, 32, etc. The value of X may be configured for the UE by the BS via, for example, RRC signaling.
In some embodiments of the present disclosure, the value of X may be dependent on a maximum number of transport blocks (TBs) schedulable by a DCI format on each cell of cell set #1. For example, assuming that cell set #1 includes N cells and denoting the maximum number of TBs schedulable by a DCI format on cell i (i={1, 2, …, N} ) as Xi, X may be equal to X1+X2+…+XN. Various method can be used for determining the value of Xi.
In some examples, the BS may configure the value of Xi for each cell within cell set #1. For example, the value of Xi may be configured for the UE by the BS via RRC signaling. In some examples, Xi can be equal to 1, 2, 4, 8, 16, 32, etc.
In some examples, the UE may determine the value of Xi for each cell within cell set #1 based on other configurations. For example, the value of Xi may be determined based on the maximum number of PDSCHs schedulable by a DCI format on cell i (denoted as Mi) or both Mi and the maximum number of codewords per PDSCH on cell i (denoted as Ki) , depending on whether spatial bundling is configured for cell i or not. For example, when spatial bundling is not configured for cell i, Xi may be equal to Mi×Ki. Otherwise, when spatial bundling is configured for cell i, Xi may be equal to Mi. In some embodiments, the BS may configure the maximum number of PDSCHs schedulable by a DCI format on each cell of cell set #1 for the UE via, for example, RRC signaling. That is, for each cell within cell set #1, the BS may configure the value of Mi for the UE.
In some embodiments of the present disclosure, the value of X may be dependent on the number of cells (e.g., N) in cell set #1 and the maximum value among the maximum number of TBs (e.g., Xi, i= {1, 2, …, N} ) schedulable by a DCI format on each cell of cell set #1. For example, X may be equal to N×max {X1, X2, …, XN} . The methods for determining the value Xi as described above may apply here. For instance, in some examples, the BS may configure the value of Xi for each cell within cell set #1 via, for example, RRC signaling. Xi can be equal to 1, 2, 4, 8, 16, 32, etc. In some other examples, the UE may determine the value of Xi for each cell within cell set #1 based on other configurations. For example, the value of Xi may be determined based on Mi or Mi and Ki, depending on whether spatial bundling is configured for cell i or not. The BS may configure the value of Mi for the UE.
In some embodiments of the present disclosure, the value of X may be dependent on other combinations of Xi, i= {1, 2, …, N} . For example, X may be dependent on the value of N and an average value of {X1, X2, …, XN} (i.e., (X1+X2+…+XN) /N) . For example, X may be dependent on the value of N and a middle value of {X1, X2, …, XN} . Other combinations that may be conceived of by persons skilled in the art can also be employed.
In some embodiments of the present disclosure, the value of X may be dependent on the number of cells (e.g., N) in cell set #1, the maximum value (denoted as M) among the maximum number of PDSCHs schedulable by a DCI format on each cell of cell set #1, and whether at least one cell of cell set #1 is configured with a maximum of 2 codewords per PDSCH without spatial bundling.
For example, X may be equal to N×M×K, where M=max {M1, M2, …, MN} and K= 2 or 1. For example, K is equal to 2 if at least one cell in cell set #1 is configured with a maximum of 2 codewords per PDSCH without spatial bundling; and K is equal to 1 if no cell in cell set #1 is configured with a maximum of 2 codewords per PDSCH or if at least one cell in cell set #1 is configured with a maximum of 2 codewords per PDSCH with spatial bundling.
In some embodiments, the value of N may be configured for the UE by the BS via, for example, RRC signaling. In some embodiments, the UE may determine the value of N based on the configuration of the cells in cell set #1, which may be configured by the BS via, for example, RRC signaling. In some embodiments, the value of M (i.e., the maximum value among the maximum number of PDSCHs schedulable by a DCI format on each cell of cell set #1) may be configured for the UE by the BS via, for example, RRC signaling. In some embodiments, the UE may determine the value of M based on the configurations for Mi (i= {1, 2, …, N} ) , i.e., M=max {M1, M2, …, MN} .
In some embodiments of the present disclosure, the value of X may be dependent on the maximum number of cells (denoted as N') schedulable by a DCI format, the maximum value (e.g., M) among the maximum number of PDSCHs schedulable by a DCI format on each cell of cell set #1, and whether at least one cell of cell set #1 is configured with a maximum of 2 codewords per PDSCH without spatial bundling.
For example, X may be equal to N'×M×K. The above descriptions of M and K may apply here. For example, M=max {M1, M2, …, MN} and K= 2 or 1. K is equal to 2 if at least one cell in cell set #1 is configured with a maximum of 2 codewords per PDSCH without spatial bundling; and K is equal to 1 if no cell in cell set #1 is configured with a maximum of 2 codewords per PDSCH or if at least one cell in cell set #1 is configured with a maximum of 2 codewords per PDSCH with spatial bundling.
In some embodiments, the value of N' may be configured for the UE by the BS via, for example, RRC signaling. In some embodiments, the UE may determine the value of N' based on configuration associated with scheduled cell combinations, which may be configured by the BS via, for example, RRC signaling. For example, the BS may configure a set of scheduled cell combinations (e.g., a cell combination table) for cell set #1. The UE can determine the value of N' based on the maximum number of cells among all cell combinations in the table. For instance, cell set #1 may include 4 cells, denoted as cell #1 to cell #4. The cell combination table may include various cell combinations of cell #1 to cell #4 and the maximum number of cells among all cell combinations in the table can be smaller than or equal to 4.
In some embodiments, the value of M (i.e., the maximum value among the maximum number of PDSCHs schedulable by a DCI format on each cell of cell set #1) may be configured for the UE by the BS via, for example, RRC signaling. In some embodiments, the UE may determine the value of M based on the configurations for Mi (i={1, 2, …, N} ) , i.e., M=max {M1, M2, …, MN} .
In some embodiments of the present disclosure, the value of X may be dependent on the total number of maximum numbers of TBs schedulable by a DCI format on all cells of each scheduled cell combination among a set of scheduled cell combinations for cell set #1. For example, the value of X may be equal to the maximum value among the total number of the maximum numbers of TBs schedulable by a DCI format on all cells of each scheduled cell combination among a set of scheduled cell combinations for cell set #1. The maximum number of TBs schedulable by a DCI format on a certain cell can be determined according to the methods as described above with respect to Xi (e.g., explicitly configured by the BS or derived from other configurations) . For example, the value of X may be determined based on (e.g., be equal to) the maximum number of TBs among all the scheduled cell combinations, with the consideration of a respective maximum number of co-scheduled PDSCHs per cell and a respective maximum number of codewords per PDSCH per cell, and respective configuration of spatial bundling per cell.
For example, assuming that the set of scheduled cell combinations for cell set #1 includes J scheduled cell combinations, and cell combination j (j= {1, 2, …, J} ) in the set of scheduled cell combinations for cell set #1 includes Q cells denoted as cell Z1 to cell ZQ, and denoting the maximum number of TBs schedulable by a DCI format on cell Zq (q= {1, 2, …, Q} ) among the Q cells asthe total number of the maximum numbers of TBs schedulable by a DCI format on all cells of cell combination j (denoted as Tj) can be determined based onThe value of X may be determined based on X=max {T1, …TJ} .
The value ofcan be determined according to the methods as described above with respect to Xi. For example, for each cell in cell set #1, the BS may configure the maximum number of TBs schedulable by a DCI format on a corresponding cell via, for example, RRC signaling. For example, the UE may determine the maximum number of TBs schedulable by a DCI format on a certain cell in cell set #1 or in a certain cell combination based on other configurations (e.g., based on the maximum number of PDSCHs schedulable by a DCI format on this cell or both the maximum number of PDSCHs schedulable by a DCI format on this cell and the maximum number of codewords per PDSCH on this cell, depending on whether spatial bundling is configured for this cell or not) .
In some examples, a BS may configure a table (a set or a list) of scheduled cell combinations for a UE via, for example, RRC signaling. The table of scheduled cell combinations may include a plurality of rows (or entries) , each of which corresponds to one or multiple cell combinations. Each cell combination may include one or more cells from cell set #1.
For example, assuming that cell set #1 includes cell #1 to cell #4, the BS may configure a table of scheduled cell combinations as shown in Table 1 for the UE. It should be understood that Table 1 is for illustrative purposes, and should not be construed as limiting the embodiments of the present disclosure.
Table 1: Scheduled cell combinations
A DCI format may include an indicator pointing to one row of the scheduled cell combination table. Assuming that the table includes Y rows, the size of the indicator in the DCI format may be dependent on (e.g., equal to or greater than) : ceil (log2 (Y) ) .
Other methods that may be conceived of by persons skilled in the art to determine the value of X can also be employed.
In response to transmitting DCI #A, the BS may transmit the plurality of PDSCHs scheduled by DCI #Ato the UE on cells in cell set #2. The UE may generate HARQ-ACK information bits for the plurality of PDSCHs scheduled by DCI #A. For example, the HARQ-ACK information bit (s) for a scheduled PDSCH may be generated based on the decoding result of this PDSCH. Various methods may be employed for ordering the HARQ-ACK information bits for the plurality of PDSCHs scheduled by DCI #A. Then, the ordered HARQ-ACK information bits may be transmitted to the BS.
In some embodiments, the HARQ-ACK information bits for the plurality of PDSCHs may be ordered according to a predefined rule.
In some examples, the HARQ-ACK information bits may be arranged in a time first, frequency second manner. For example, the HARQ-ACK information bits may be firstly arranged according to a predefined order (e.g., increasing or decreasing order) of a PDSCH reception starting position (or PDSCH reception starting timing) for each cell in cell set #2, and then the arranged HARQ-ACK information bits may be concatenated according to a predefined order (e.g., ascending or descending order) of cell indices of cells in cell set #2. In the context of the present disclosure, from the perspective of a BS, the PDSCH "reception" starting position or timing may be replaced with the PDSCH "transmission" starting position or timing.
For example, the HARQ-ACK information bits for the scheduled PDSCHs may be firstly ordered in an increasing order of a PDSCH reception starting position for each cell in cell set #2, and then concatenated in an ascending order of the cell indices, i.e., from the cell with the lowest serving cell index to the cell with the highest serving cell index among the cells in cell set #2.
Referring to FIG. 3, a BS may transmit DCI format 311 and PDSCHs 321-326 scheduled by DCI format 311 to a UE. Assuming that for each of the scheduled PDSCHs, a single HARQ-ACK information bit is required, the UE may generate six HARQ-ACK information bits (denoted as b1 to b6) for PDSCHs 321-326 according to the respective decoding results of PDSCHs 321-326. Assuming that the serving cell indices of CCs 331-333 satisfy CC 331<CC 332<CC 333, the UE may order the six HARQ-ACK information bits as {b1, b2, b3, b4, b5, b6} and transmit the ordered HARQ-ACK information bits to the BS.
Referring to FIG. 4, a BS may transmit DCI format 411 and PDSCHs 421-427 scheduled by DCI format 411 to a UE. Assuming that for each of the scheduled PDSCHs, a single HARQ-ACK information bit is required, the UE may generate seven HARQ-ACK information bits (denoted as a1 to a7) for PDSCHs 421-427 according to the respective decoding results of PDSCHs 421-427. Assuming that the serving cell indices of CCs 431-433 satisfy CC 431<CC 432<CC 433, the UE may order the seven HARQ-ACK information bits as {a1, a2, a3, a4, a5, a6, a7} and transmit the ordered HARQ-ACK information bits to the BS.
In some examples, the HARQ-ACK information bits may be arranged in a frequency first, time second manner. For example, the predefined rule may include arranging the HARQ-ACK information bits firstly according to a predefined order of cell indices of each cell in cell set #2 and then according to a predefined order of the PDSCH reception starting position (or PDSCH reception starting timing) .
For example, the HARQ-ACK information bits for the scheduled PDSCHs may be firstly ordered in an ascending order of cell indices and then ordered based on the PDSCH reception starting position.
Referring to FIG. 3, the UE may order the six HARQ-ACK information bits (e.g., b1 to b6) for PDSCHs 321-326 as {b1, b4, b6, b2, b5, b3} and transmit the ordered HARQ-ACK information bits to the BS. Referring to FIG. 4, the UE may order the seven HARQ-ACK information bits (e.g., a1 to a7) for PDSCHs 421-427 as {a1, a2, a4, a5, a3, a6, a7} and transmit the ordered HARQ-ACK information bits to the BS.
For the plurality of PDSCHs scheduled by DCI #A on cells in cell set #2, the UE may generate the HARQ-ACK information bit (s) for each of the plurality of PDSCHs scheduled by DCI #A, and may add at least one padding bit (e.g., negative ACK (NACK) bit) to the generated HARQ-ACK information bits before transmitting them to the BS. In other words, in some cases, the HARQ-ACK information bits corresponding to the plurality of PDSCHs scheduled by DCI #A transmitted to the BS may include at least one padding bit. For example, the at least one padding bit may be added to align the determined number of HARQ-ACK information bits, i.e., the value of X as described above.
For example, denoting the (actual) number of HARQ-ACK information bits for the (actually) received or scheduled PDSCHs co-scheduled by DCI #A as Y, the UE may add X-Y padding bits to the Y HARQ-ACK information bits. That is, X-Y padding bits may be added such that X bits are transmitted to the BS as the feedback corresponding to the PDSCHs scheduled by DCI #A. In the case that Y is equal to or greater than X, no padding bit is added.
Various methods may be employed to add the X-Y padding bits.
In some embodiments, the UE may generate a HARQ-ACK information bit (s) for each of the plurality of PDSCHs scheduled by DCI #A, and then order the generated HARQ-ACK information bits (i.e., Y bits) for the plurality of PDSCHs according to, for example, the method as described above. When Y﹤X, the UE may add X-Y padding bits to the ordered HARQ-ACK information bits to obtain a total of X bits. In some examples, the X-Y padding bits may be added to a predefined position of the ordered Y HARQ-ACK information bits. For example, the X-Y padding bits may be appended to or added to the end of the ordered Y HARQ-ACK information bits. For example, the X-Y padding bits may be added to the beginning of the ordered Y HARQ-ACK information bits.
In some embodiments, the padding bit (s) may be added per cell. For example, the UE may generate the HARQ-ACK information bit (s) for the PDSCHs scheduled on each cell in cell set #2. The UE may add one or more padding bits to the HARQ-ACK information bit (s) for the PDSCHs scheduled on a corresponding cell in cell set #2 to align the maximum number of TBs schedulable by a DCI format on the corresponding cell in cell set #2.
For example, as mentioned above, the value of X may be equal to X1+X2+…+XN. Denoting the number of HARQ-ACK information bits generated for cell i as Yi, when cell i is not scheduled by DCI #A (e.g., not included in cell set #2) , Yi=0; otherwise, when cell i is scheduled by DCI #A (e.g., included in cell set #2) , Yi is the number of HARQ-ACK information bits actually generated by the UE for the PDSCH (s) scheduled by DCI #A on cell i.
For cell i in cell set #1, Xi-Yi padding bits may be added to the Yi HARQ-ACK information bits. For example, for each cell in cell set #1 but not in cell set #2, Xi padding bits may be added. For each cell in both cell set #1 and cell set #2, Xi-Yi padding bits may be added to the Yi HARQ-ACK information bits generated according to the decoding results of the corresponding PDSCHs.
In some examples, the Xi-Yi padding bits may be added to a predefined position of the Yi HARQ-ACK information bits. For example, the Xi-Yi padding bits may be appended to or added to the end of the Yi HARQ-ACK information bits. For example, the Xi-Yi padding bits may be added to the beginning of the Yi HARQ-ACK information bits.
For example, the value of X may be equal to N×max {X1, X2, …, XN} . For cell i in cell set #1, max {X1, X2, …, XN} -Yi padding bits may be added to the Yi HARQ-ACK information bits.
For example, the value of X may be equal to N×M×K. For cell i in cell set #1, M×K-Yi padding bits may be added to the Yi HARQ-ACK information bits.
For example, the value of X may be equal to N'×M×K. For cell i in cell set #2, M×K-Yi padding bits may be added to the Yi HARQ-ACK information bits. In some embodiments, additional padding bits may be added. For example, denoting the number of cells in cell set #2 as N” , after the above padding process for cells in cell set #2, a total of N” ×M×K bits is obtained. When N” is smaller than N', (N'-N” ) ×M×K padding bits may be further added to the N” ×M×K bits.
In some embodiments, for a DCI format (e.g., DCI #A) scheduling a plurality of PDSCHs on a set of cells (e.g., cell set #2) with one or multiple PDSCHs scheduled per cell, the reference PDSCH for determining the counter downlink assignment indicator (DAI) counting may be the earliest PDSCH among the one or multiple PDSCHs on the cell with a predefined (e.g., smallest) serving cell index among the set of cells (e.g., cell set #2) . For example, referring to FIG. 3, the reference PDSCH for the counter DAI counting may be PDSCH 321.
In some embodiments, for a DCI format (e.g., DCI #A) scheduling a plurality of PDSCHs on a set of cells (e.g., cell set #2) with one or multiple PDSCHs scheduled per cell, the earliest PDSCH among one or multiple PDSCHs on the cell with the a predefined (e.g., smallest) serving cell index among the set of cells (e.g., cell set #2) may be used to determine the last DCI format for physical uplink control channel (PUCCH) determination among DCI formats within the same PDCCH monitoring occasion.
FIG. 5 illustrates a flowchart of method 500 for wireless communication in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 5. In some examples, the method 500 may be performed by a UE, for example, a UE 104 as described with reference to FIG. 1. In some embodiments, the UE may execute a set of instructions to control the functional elements of the UE to perform the described functions or operations.
At 511, the UE may receive, from a BS, a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for the UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells. For example, the DCI format may be DCI #A as described above. For example, the first set of cells and the second set of cells may be cell set #2 and cell set #1, respectively.
At 513, the UE may determine the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs. For example, various methods for determining the value of X as mentioned above may apply here.
For example, in some embodiments, the number of HARQ-ACK information bits may be dependent on one of the following: a maximum payload size of a DCI format; a maximum number of TBs schedulable by a DCI format on each cell of the second set of cells; a number of cells in the second set of cells and a maximum value among the maximum number of TBs schedulable by a DCI format on each cell of the second set of cells; the number of cells in the second set of cells, a maximum value among the maximum number of PDSCHs schedulable by a DCI format on each cell of the second set of cells, and whether at least one cell of the second set of cells is configured with a maximum of 2 codewords per PDSCH without spatial bundling; a maximum number of cells schedulable by a DCI format, the maximum value among the maximum number of PDSCHs schedulable by a DCI format on each cell of the second set of cells, and whether at least one cell of the second set of cells is configured with a maximum of 2 codewords per PDSCH without spatial bundling; and a total number of maximum numbers of TBs schedulable by a DCI format on all cells of each scheduled cell combination among a set of scheduled cell combinations for the second set of cells.
In some embodiments, the maximum number of TBs schedulable by a DCI format on a corresponding cell may be configured for the UE by the BS. In some embodiments, the maximum number of TBs schedulable by a DCI format on a corresponding cell may be determined based on a maximum number of PDSCHs schedulable by a DCI format on the corresponding cell or both the maximum number of PDSCHs schedulable by a DCI format on the corresponding cell and a maximum number of codewords per PDSCH on the corresponding cell, depending on whether spatial bundling is configured for the corresponding cell or not.
In some embodiments, the UE may receive one or more of the following from the BS: the number of HARQ-ACK information bits; a maximum number of PDSCHs schedulable by a DCI format on each cell of the second set of cells; the number of cells in the second set of cells; the configuration of the cells in the second set of cells; a maximum value among the maximum number of PDSCHs schedulable by a DCI format on each cell of the second set of cells; a maximum number of cells schedulable by a DCI format; and a set of scheduled cell combinations for the second set of cells.
At 515, the UE may order the HARQ-ACK information bits corresponding to the plurality of PDSCHs. At 517, the UE may transmit, to the BS, the ordered HARQ-ACK information bits.
In some embodiments, the HARQ-ACK information bits corresponding to the plurality of PDSCHs may include at least one padding bit.
In some embodiments, the UE may generate a HARQ-ACK information bit (s) for each of the plurality of PDSCHs. Ordering the HARQ-ACK information bits corresponding to the plurality of PDSCHs may include ordering the generated HARQ-ACK information bit (s) for each of the plurality of PDSCHs. The UE may add the at least one padding bit to the ordered HARQ-ACK information bits to align the number of HARQ-ACK information bits.
In some embodiments, the UE may generate a HARQ-ACK information bit (s) for the one or more PDSCHs scheduled on each cell of the first set of cells. The UE may add one or more padding bits to the HARQ-ACK information bit (s) for the one or more PDSCHs scheduled on a corresponding cell of the first set of cells to align a maximum number of TBs schedulable by a DCI format on the corresponding cell of the first set of cells.
In some embodiments, the HARQ-ACK information bits corresponding to the plurality of PDSCHs may be ordered according to a predefined rule.
In some embodiments, the predefined rule may include firstly arranging the HARQ-ACK information bits according to a predefined order of a PDSCH reception starting position for each cell of the first set of cells and then concatenating the arranged HARQ-ACK information bits according to a predefined order of cell indices of the first set of cells. In some embodiments, the predefined rule may include arranging the HARQ-ACK information bits firstly according to a predefined order of cell indices of the first set of cells and then according to a predefined order of the PDSCH reception starting position.
It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary method 500 may be changed and some of the operations in exemplary method 500 may be eliminated or modified, without departing from the spirit and scope of the disclosure.
FIG. 6 illustrates a flowchart of method 600 for wireless communication in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 6. In some examples, the method 600 may be performed by a BS or an NE (for example, NE 106 as described with reference to FIG. 1) . In some embodiments, the BS or the NE may execute a set of instructions to control the functional elements of the BS or the NE to perform the described functions or operations.
At 611, a BS may transmit, to a UE, a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for the UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells. For example, the DCI format may be DCI #A as described above. For example, the first set of cells and the second set of cells may be cell set #2 and cell set #1, respectively.
At 613, the BS may determine the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs and bit positions of the HARQ-ACK information bits corresponding to the plurality of PDSCHs. For example, various methods for determining the value of X as mentioned above may apply here. For example, various methods for HARQ-ACK information bit ordering as mentioned above may apply here. At 615, the BS may receive the HARQ-ACK information bits corresponding to the plurality of PDSCHs.
In some embodiments, the number of HARQ-ACK information bits may be dependent on one of the following: a maximum payload size of a DCI format; a maximum number of TBs schedulable by a DCI format on each cell of the second set of cells; a number of cells in the second set of cells and a maximum value among the maximum number of TBs schedulable by a DCI format on each cell of the second set of cells; the number of cells in the second set of cells, a maximum value among the maximum number of PDSCHs schedulable by a DCI format on each cell of the second set of cells, and whether at least one cell of the second set of cells is configured with a maximum of 2 codewords per PDSCH without spatial bundling; a maximum number of cells schedulable by a DCI format, the maximum value among the maximum number of PDSCHs schedulable by a DCI format on each cell of the second set of cells, and whether at least one cell of the second set of cells is configured with a maximum of 2 codewords per PDSCH without spatial bundling; and a total number of maximum numbers of TBs schedulable by a DCI format on all cells of each scheduled cell combination among a set of scheduled cell combinations for the second set of cells.
In some embodiments, the maximum number of TBs schedulable by a DCI format on a corresponding cell may be configured for the UE by the BS. In some embodiments, the maximum number of TBs schedulable by a DCI format on a corresponding cell may be determined based on a maximum number of PDSCHs schedulable by a DCI format on the corresponding cell or both the maximum number of PDSCHs schedulable by a DCI format on the corresponding cell and a maximum number of codewords per PDSCH on the corresponding cell, depending on whether spatial bundling is configured for the corresponding cell or not.
In some embodiments, the BS may transmit one or more of the following to the UE: the number of HARQ-ACK information bits; a maximum number of PDSCHs schedulable by a DCI format on each cell of the second set of cells; the number of cells in the second set of cells; the configuration of the cells in the second set of cells; a maximum value among the maximum number of PDSCHs schedulable by a DCI format on each cell of the second set of cells; a maximum number of cells schedulable by a DCI format; and a set of scheduled cell combinations for the second set of cells.
In some embodiments, the HARQ-ACK information bits corresponding to the plurality of PDSCHs may include at least one padding bit.
In some embodiments, the HARQ-ACK information bits corresponding to the plurality of PDSCHs may include a HARQ-ACK information bit (s) for each of the plurality of PDSCHs which are ordered according to a predefined rule and the at least one padding bit added to the ordered HARQ-ACK information bits to align the number of HARQ-ACK information bits.
In some embodiments, the HARQ-ACK information bits corresponding to the plurality of PDSCHs may include, for each cell of the first set of cells, a HARQ-ACK information bit (s) for the one or more PDSCHs scheduled on a corresponding cell of the first set of cells, and one or more padding bits added to the HARQ-ACK information bit(s) for the one or more PDSCHs scheduled on the corresponding cell of the first set of cells to align a maximum number of TBs schedulable by a DCI format on the corresponding cell of the first set of cells.
In some embodiments, the HARQ-ACK information bits corresponding to the plurality of PDSCHs may be ordered according to a predefined rule.
In some embodiments, the predefined rule may include firstly arranging the HARQ-ACK information bits according to a predefined order of a PDSCH transmission starting position for each cell of the first set of cells and then concatenating the arranged HARQ-ACK information bits according to a predefined order of cell indices of the first set of cells. In some embodiments, the predefined rule may include arranging the HARQ-ACK information bits firstly according to a predefined order of cell indices of the first set of cells and then according to a predefined order of the PDSCH transmission starting position.
It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary method 600 may be changed and some of the operations in exemplary method 600 may be eliminated or modified, without departing from the spirit and scope of the disclosure.
FIG. 7 illustrates a block diagram of exemplary apparatus 700 according to some embodiments of the present disclosure. As shown in FIG. 7, the apparatus 700 may include at least one processor 706 and at least one transceiver 702 coupled to the processor 706. The apparatus 700 may be a UE or an NE (e.g., a BS) .
Although in this figure, elements such as the at least one transceiver 702 and processor 706 are described in the singular, the plural is contemplated unless a limitation to the singular is explicitly stated. In some embodiments of the present disclosure, the transceiver 702 may be divided into two devices, such as a receiving circuitry and a transmitting circuitry. In some embodiments of the present disclosure, the apparatus 700 may further include an input device, a memory, and/or other components.
In some embodiments of the present disclosure, the apparatus 700 may be a UE. The transceiver 702 and the processor 706 may interact with each other so as to perform the operations with respect to the UE described in FIGs. 1-6. In some embodiments of the present disclosure, the apparatus 700 may be an NE (e.g., a BS) . The transceiver 702 and the processor 706 may interact with each other so as to perform the operations with respect to the BS or NE described in FIGs. 1-6.
In some embodiments of the present disclosure, the apparatus 700 may further include at least one non-transitory computer-readable medium.
For example, in some embodiments of the present disclosure, the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 706 to implement the method with respect to the UE as described above. For example, the computer-executable instructions, when executed, cause the processor 706 interacting with transceiver 702 to perform the operations with respect to the UE described in FIGs. 1-6.
In some embodiments of the present disclosure, the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 706 to implement the method with respect to the BS or NE as described above. For example, the computer-executable instructions, when executed, cause the processor 706 interacting with transceiver 702 to perform the operations with respect to the BS or NE described in FIGs. 1-6.
FIG. 8 illustrates an example of a UE 800 in accordance with aspects of the present disclosure. The UE 800 may include a processor 802, a memory 804, a controller 806, and a transceiver 808. The processor 802, the memory 804, the controller 806, or the transceiver 808, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
The processor 802, the memory 804, the controller 806, or the transceiver 808, or various combinations or components thereof may be implemented in hardware (e.g., circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
The processor 802 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 802 may be configured to operate the memory 804. In some other implementations, the memory 804 may be integrated into the processor 802. The processor 802 may be configured to execute computer-readable instructions stored in the memory 804 to cause the UE 800 to perform various functions of the present disclosure.
The memory 804 may include volatile or non-volatile memory. The memory 804 may store computer-readable, computer-executable code including instructions when executed by the processor 802 cause the UE 800 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 804 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
In some implementations, the processor 802 and the memory 804 coupled with the processor 802 may be configured to cause the UE 800 to perform one or more of the functions described herein (e.g., executing, by the processor 802, instructions stored in the memory 804) . For example, the processor 802 may support wireless communication at the UE 800 in accordance with examples as disclosed herein. For example, the UE 800 may be configured to support means for performing the operations as described with respect to FIG. 5.
For example, the UE 800 may be configured to support a means for receiving, from a BS (or an NE) , a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for a UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells; a means for determining the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs; a means for ordering the HARQ-ACK information bits corresponding to the plurality of PDSCHs; and a means for transmitting, to the BS, the ordered HARQ-ACK information bits.
The controller 806 may manage input and output signals for the UE 800. The controller 806 may also manage peripherals not integrated into the UE 800. In some implementations, the controller 806 may utilize an operating system such asor other operating systems. In some implementations, the controller 806 may be implemented as part of the processor 802.
In some implementations, the UE 800 may include at least one transceiver 808. In some other implementations, the UE 800 may have more than one transceiver 808. The transceiver 808 may represent a wireless transceiver. The transceiver 808 may include one or more receiver chains 810, one or more transmitter chains 812, or a combination thereof.
A receiver chain 810 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 810 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 810 may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receiver chain 810 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 810 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
A transmitter chain 812 may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmitter chain 812 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmitter chain 812 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 812 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
It should be appreciated by persons skilled in the art that the components in exemplary UE 800 may be changed, for example, some of the components in exemplary UE 800 may be omitted or modified or new component (s) may be added to exemplary UE 800, without departing from the spirit and scope of the disclosure. For example, in some embodiments, the UE 800 may not include the controller 806.
FIG. 9 illustrates an example of a processor 900 in accordance with aspects of the present disclosure. The processor 900 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 900 may include a controller 902 configured to perform various operations in accordance with examples as described herein. The processor 900 may optionally include at least one memory 904, which may be, for example, an L1/L2/L3 cache. Additionally, or alternatively, the processor 900 may optionally include one or more arithmetic-logic units (ALUs) 906. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
The processor 900 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 900) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
The controller 902 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 900 to cause the processor 900 to support various operations in accordance with examples as described herein. For example, the controller 902 may operate as a control unit of the processor 900, generating control signals that manage the operation of various components of the processor 900. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
The controller 902 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 904 and determine subsequent instruction (s) to be executed to cause the processor 900 to support various operations in accordance with examples as described herein. The controller 902 may be configured to track memory address of instructions associated with the memory 904. The controller 902 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 902 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 900 to cause the processor 900 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 902 may be configured to manage flow of data within the processor 900. The controller 902 may be configured to control transfer of data between registers, ALUs, and other functional units of the processor 900.
The memory 904 may include one or more caches (e.g., memory local to or included in the processor 900 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 904 may reside within or on a processor chipset (e.g., local to the processor 900) . In some other implementations, the memory 904 may reside external to the processor chipset (e.g., remote to the processor 900) .
The memory 904 may store computer-readable, computer-executable code including instructions that, when executed by the processor 900, cause the processor 900 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 902 and/or the processor 900 may be configured to execute computer-readable instructions stored in the memory 904 to cause the processor 900 to perform various functions. For example, the processor 900 and/or the controller 902 may be coupled with or to the memory 904, the processor 900, the controller 902, and the memory 904 may be configured to perform various functions described herein. In some examples, the processor 900 may include multiple processors and the memory 904 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
The one or more ALUs 906 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 906 may reside within or on a processor chipset (e.g., the processor 900) . In some other implementations, the one or more ALUs 906 may reside external to the processor chipset (e.g., the processor 900) . One or more ALUs 906 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 906 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 906 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 906 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 906 to handle conditional operations, comparisons, and bitwise operations.
The processor 900 may support wireless communication in accordance with examples as disclosed herein.
For example, the processor 900 may be configured to support means for performing the operations as described with respect to FIG. 5. For example, the processor 900 may be configured to or operable to support a means for receiving, from a BS (or an NE) , a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for a UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells; a means for determining the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs; a means for ordering the HARQ-ACK information bits corresponding to the plurality of PDSCHs; and a means for transmitting, to the BS, the ordered HARQ-ACK information bits.
For example, the processor 900 may be configured to support means for performing the operations as described with respect to FIG. 6. For example, the processor 900 may be configured to support a means for transmitting, to a UE, a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for the UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells; a means for determining the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs and bit positions of the HARQ-ACK information bits corresponding to the plurality of PDSCHs; and a means for receiving the HARQ-ACK information bits corresponding to the plurality of PDSCHs.
It should be appreciated by persons skilled in the art that the components in exemplary processor 900 may be changed, for example, some of the components in exemplary processor 900 may be omitted or modified or new component (s) may be added to exemplary processor 900, without departing from the spirit and scope of the disclosure. For example, in some embodiments, the processor 900 may not include the ALUs 906.
FIG. 10 illustrates an example of an NE 1000 in accordance with aspects of the present disclosure. The NE 1000 may include a processor 1002, a memory 1004, a controller 1006, and a transceiver 1008. The processor 1002, the memory 1004, the controller 1006, or the transceiver 1008, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
The processor 1002, the memory 1004, the controller 1006, or the transceiver 1008, or various combinations or components thereof may be implemented in hardware (e.g., circuitry) . The hardware may include a processor, a DSP, an ASIC, or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
The processor 1002 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 1002 may be configured to operate the memory 1004. In some other implementations, the memory 1004 may be integrated into the processor 1002. The processor 1002 may be configured to execute computer-readable instructions stored in the memory 1004 to cause the NE 1000 to perform various functions of the present disclosure.
The memory 1004 may include volatile or non-volatile memory. The memory 1004 may store computer-readable, computer-executable code including instructions when executed by the processor 1002 cause the NE 1000 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 1004 or another type of memory. Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.
In some implementations, the processor 1002 and the memory 1004 coupled with the processor 1002 may be configured to cause the NE 1000 to perform one or more of the functions described herein (e.g., executing, by the processor 1002, instructions stored in the memory 1004) . For example, the processor 1002 may support wireless communication at the NE 1000 in accordance with examples as disclosed herein. For example, the NE 1000 may be configured to support means for performing the operations as described with respect to FIG. 6.
For example, the NE 1000 may be configured to support a means for transmitting, to a UE, a DCI format for scheduling a plurality of PDSCHs on a first set of cells among a second set of cells configured for the UE by the BS, wherein the DCI format schedules one or more PDSCHs among the plurality of PDSCHs on each cell of the first set of cells; a means for determining the number of HARQ-ACK information bits corresponding to the plurality of PDSCHs and bit positions of the HARQ-ACK information bits corresponding to the plurality of PDSCHs; and a means for receiving the HARQ-ACK information bits corresponding to the plurality of PDSCHs.
The controller 1006 may manage input and output signals for the NE 1000. The controller 1006 may also manage peripherals not integrated into the NE 1000. In some implementations, the controller 1006 may utilize an operating system such as or other operating systems. In some implementations, the controller 1006 may be implemented as part of the processor 1002.
In some implementations, the NE 1000 may include at least one transceiver 1008. In some other implementations, the NE 1000 may have more than one transceiver 1008. The transceiver 1008 may represent a wireless transceiver. The transceiver 1008 may include one or more receiver chains 1010, one or more transmitter chains 1012, or a combination thereof.
A receiver chain 1010 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 1010 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 1010 may include at least one amplifier (e.g., an LNA) configured to amplify the received signal. The receiver chain 1010 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 1010 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
A transmitter chain 1012 may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmitter chain 1012 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as AM, FM, or digital modulation schemes like PSK or QAM. The transmitter chain 1012 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 1012 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
It should be appreciated by persons skilled in the art that the components in exemplary NE 1000 may be changed, for example, some of the components in exemplary NE 1000 may be omitted or modified or new component (s) may be added to exemplary NE 1000, without departing from the spirit and scope of the disclosure. For example, in some embodiments, the NE 1000 may not include the controller 1006.
Those having ordinary skill in the art would understand that the operations or steps of the methods described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. Additionally, in some aspects, the operations or steps of the methods may reside as one or any combination or set of codes and/or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.
While this disclosure has been described with specific embodiments thereof, it is evident that many alternatives, modifications, and variations may be apparent to those skilled in the art. The disclosure is not limited to the examples and designs described herein but is to be accorded with the broadest scope consistent with the principles and novel features disclosed herein. For example, various components of the embodiments may be interchanged, added, or substituted in other embodiments. Also, all of the elements of each figure are not necessary for the operation of the disclosed embodiments. For example, one of ordinary skill in the art of the disclosed embodiments would be enabled to make and use the teachings of the disclosure by simply employing the elements of the independent claims. Accordingly, embodiments of the disclosure as set forth herein are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit and scope of the disclosure.
In this document, the terms "includes, " "including, " or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "a, " "an, " or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element. Also, the term "another" is defined as at least a second or more. The term "having" or the like, as used herein, is defined as "including. " Expressions such as "A and/or B" or "at least one of A and B" may include any and all combinations of words enumerated along with the expression. For instance, the expression "A and/or B" or "at least one of A and B" may include A, B, or both A and B. The wording "the first, " "the second" or the like is only used to clearly illustrate the embodiments of the present disclosure, but is not used to limit the substance of the present disclosure.