The terms "first," "second," and the like in the description and in the claims, as well as in the drawings of the specification, are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
It is to be understood that the terminology used in the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" may include plural referents unless the context clearly dictates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It should be noted that, unless otherwise specified, various technical features in the embodiments of the present invention may be regarded as being capable of being combined or coupled with each other as long as the combination or coupling is not technically impossible to implement. While certain exemplary, optional, or preferred features may be described in combination with other features in various embodiments of the invention for a more complete description of the invention, it is not necessary for such combination to be considered, and it is to be understood that the exemplary, optional, or preferred features and the other features may be separable or separable from each other, provided that such separation or separation is not technically impractical. Some functional descriptions of technical features in method embodiments may be understood as performing the function, method, or step, and some functional descriptions of technical features in apparatus embodiments may be understood as performing the function, method, or step using the apparatus.
The techniques described herein may be used for various wireless Communication networks, such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA) networks, Single-carrier Frequency-Division Multiple Access (SC-FDMA), and other networks, the terms "network" and "System" are generally used interchangeably, CDMA networks may implement wireless technologies such as Universal Terrestrial Radio Access (UTRA), Telecommunications Industry Association (TIA), broadband a technologies including wcdma variants and other technologies from CDMA Industry Association, including Global IS-Telecommunications System (IS) and Mobile Communication systems such as gsm-Telecommunications System (TIA) 95, GSM) or the like. OFDMA systems may implement wireless technologies such as evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE802.11 (Wireless Fidelity), IEEE802.16 (Worldwide Interoperability for Microwave Access, WiMAX), IEEE802.20, Flash-OFDMA, and the like. UTRA and E-UTRA technologies are part of the Universal Mobile Telecommunications System (UMTS). 3GPP Long Term Evolution (LTE) and LTE-advanced (LTE-A) are newer versions of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE-A, and GSM are described in documents from an organization named "third Generation partnership project" (3 GPP). UMB is described in a document from an organization called "third generation partnership project 2" (3GPP 2). The techniques described herein may be used for the wireless networks and radio access technologies mentioned above, as well as other wireless networks and radio access technologies. For clarity, certain aspects of the technology are described below with respect to LTE or LTE-a (or collectively "LTE/-a"), and such LTE/-a terminology is used in much of the description below.
It should be noted that the wireless communication network may include a plurality of base stations capable of supporting communication for a plurality of user equipments. The user equipment may communicate with the base station via the downlink and uplink. The downlink (or forward link) refers to the communication link from the base stations to the user equipment, and the uplink (or reverse link) refers to the communication link from the user equipment to the base stations.
User equipment (e.g., a cellular telephone or smartphone) may utilize a wireless communication system to transmit and receive data for two-way communication. The user equipment may include a transmitter for data transmission and a receiver for data reception. For data transmission, a transmitter may modulate a transmit Local Oscillator (LO) signal with data to obtain a modulated Radio Frequency (RF) signal, amplify the modulated RF signal to obtain an output RF signal having an appropriate transmit power level, and transmit the output RF signal to a base station via an antenna. For data reception, the receiver may obtain a received RF signal via an antenna, amplify and downconvert the received RF signal with a receive LO signal, and process the downconverted signal to recover data transmitted by the base station.
The user equipment may support communication (e.g., LTE/TE-a and NR) with multiple wireless systems of different Radio Access Technologies (RATs). Each wireless system may have certain characteristics and requirements to efficiently support simultaneous communication for wireless systems utilizing different RATs. User equipment may include mobile stations, terminals, access terminals, subscriber units, stations, and so on. The user device may also be a cellular phone, a smart phone, a tablet computer, a wireless modem, a Personal Digital Assistant (PDA), a handheld device, a laptop computer, a smartbook, a netbook, a cordless phone, a Wireless Local Loop (WLL) site, a bluetooth device, and so forth. The user equipment may be capable of communicating with a wireless System, and may also be capable of receiving signals from a broadcast station, satellites in one or more Global Navigation Satellite Systems (GNSS), and/or the like. The user equipment may support one or more RATs for wireless communication, such as GSM, WCDMA, cdma2000, LTE/LTE-a, 802.11, and so on. The terms "radio access technology", "RAT", "radio technology", "air interface" and "standard" are often used interchangeably.
The user equipment may support carrier aggregation, which is an operation on multiple carriers. Carrier aggregation may also be referred to as multi-carrier operation. A carrier may refer to a range of frequencies used for communication and may be associated with certain characteristics. For example, a carrier may be associated with system information and/or control information describing operation on the carrier. A carrier may also be referred to as a Component Carrier (CC), a frequency channel, a cell, and so on. One band may include one or more carriers. Illustratively, each carrier may cover up to 20 MHz. The user equipment may be configured with up to 5 carriers in one or two bands. The user equipment may include multiple receivers to simultaneously receive multiple downlink signals at different frequencies. These multiple downlink signals may be transmitted by one or more base stations on multiple carriers at different frequencies for carrier aggregation. Each receiver may receive one or more downlink signals transmitted to the user equipment on one or more carriers. A UE operating in a Carrier aggregation scenario is configured for certain functions, such as control and feedback functions, of aggregating multiple carriers on the same Carrier, which may be referred to as a Primary Carrier or Primary Component Carrier (PCC). The remaining carriers supported by means of the primary Carrier are referred to as associated secondary carriers or Secondary Component Carriers (SCCs). The primary carrier is transmitted by the primary cell. The secondary carrier is transmitted by the secondary cell. In some embodiments, there may be multiple primary carriers. In addition, secondary carriers may be added or removed without affecting the basic operation of the UE. In carrier aggregation, control functions may be aggregated from at least two carriers onto one carrier to form a primary carrier and one or more associated secondary carriers. A communication link may be established for the primary carrier and each secondary carrier. Subsequently, communication may be controlled based on the primary carrier. In carrier aggregation, the user equipment may also transmit a UE capability information message indicating supported bands and carrier aggregation bandwidth classes to the serving base station. Depending on the UE capabilities, the serving base station may configure the UE using an RRC connection reconfiguration procedure. The RRC connection reconfiguration procedure allows the serving base station to add and remove secondary cells (currently up to four secondary cells) of the serving base station transmitting on the secondary carrier, and to modify the primary cell of the serving base station transmitting on the primary carrier. During handover, the serving base station may add and remove secondary cells at the target primary cell using an RRC connection reconfiguration procedure. The serving base station may use the activation/deactivation MAC control element to activate or deactivate data transmission of the secondary cell. Currently, the UE monitors a Master Information Block (MIB) and a system information block SIB from the primary cell. The primary cell is responsible for sending MIB and some SIBs of the secondary cell to the UE. The primary cell transmits a secondary cell MIB and some SIBs through a radio resource configuration common secondary cell (radio resource configcommonconsell) information element and a radio resource dedicated secondary cell (radio resource dedicatedcell) information element. In some embodiments of the invention, the primary carrier or the primary component carrier may be configured as a first spectrum, which may be a licensed spectrum; the associated secondary carrier or secondary component carrier may be configured as a second spectrum, the second spectrum being an unlicensed spectrum.
In the LTE/LTE-a system, Single-carrier Frequency-Division Multiple Access (SC-FDMA)/OFDM and Cyclic Prefix (CP) are used for uplink and downlink carriers, respectively. In the 5G standard, for example, uplink and downlink carriers may be unified, that is, OFDM and CP are used for uplink and downlink. Further illustratively, the RB in 5G may be configured such that 1 resource block includes 12 subcarriers, the subcarrier spacing is based on 15kHz, and the subcarrier spacing may be N (N ═ 2^ N) times of 15kHz, or may be fixed to be 75 kHz. Specifically, the bandwidth of the conventional LTE cell operating in the frequency band is formed by RBs, and the RBs respectively have a fixed subcarrier spacing and a fixed symbol length, for example, under a normal CP, the size of the RB is 180KHz (i.e., 12 subcarrier spacings of 15 KHz), and the RB includes 7 symbols in the time domain, and the length of one symbol is approximately equal to 71.5 us. Whereas in next generation 5G mobile communication technologies (e.g. NR systems) the different subcarriers may no longer have a fixed subcarrier spacing and a fixed symbol length (which may vary dynamically) based on the traffic type. To distinguish from the RB concept in the conventional LTE system, the NR system newly defines a concept of "numerology" (reference value), which mainly includes a subcarrier spacing, a CP length, a TTI length, and the like. Currently, NR systems define three traffic types, which are eMBB, URLLC and mtc, respectively, and the "numerology" types of different traffic types may also be different, meaning that different types of subcarrier spacing, CP length or TTI length may be different. Illustratively, it can be defined that next generation mobile communications will support a single carrier bandwidth of up to 100 MHz. One resource block RB is changed in size to 900KHz (i.e., 12 75KHz subcarrier intervals) in the frequency domain and supports 0.1ms in the time domain. One radio frame is 10ms in length but is composed of 50 subframes, each of which is 0.2ms in length. It should be noted that, the signal type applicable to the NR service described throughout this document may refer to a configuration of at least one of related parameters including a carrier spacing, a CP length, and a TTI length.
Specifically, the embodiment of the present invention is applied to an LAA system that can combine all the above technical characteristics, where the LAA system may use an unlicensed spectrum resource (e.g., a 5GHz spectrum) with the assistance of a spectrum of a Long Term Evolution (LTE) system. It should be particularly noted that the following description of a specific network architecture in the embodiment of the present invention is only an example (for example, LTE/LTE-a), and should not be construed as a limitation. The method and apparatus disclosed in the present invention can be applied to the network architecture of the subsequent evolution (for example, the next generation 5G).
Fig. 1 shows a system architecture of an LTE/LTE-a system, where descriptions of network elements and interfaces are as follows:
mobility Management Entity (MME)/serving gateway (ServingGateWay, S-GW): the MME is a key control node in the third Generation partnership project (3GPP), LTE, and belongs to a core network element, and is mainly responsible for a signaling processing part, i.e., a control plane function, including functions such as access control, mobility management, attach and detach, a session management function, and gateway selection. The S-GW is an important network element of a core network in 3GPP LTE, and is mainly responsible for a user plane function of user data forwarding, that is, routing and forwarding of a data packet are performed under control of the MME.
eNB: an enodeb (enb) may be a station that communicates with user equipment, UE, and may also be referred to as a base station, a node B, an access point, etc. Each eNB may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" can refer to this particular geographic coverage area of an eNB and/or of an eNB subsystem serving this coverage area, depending on the context in which the term is used. The eNB is mainly responsible for functions of radio resource management, Quality of Service (QoS) management, data compression and encryption, and the like on the air interface side. And towards the core network side, the eNB is mainly responsible for forwarding the control plane signaling to the MME and forwarding the user plane service data to the S-GW. An eNB may provide communication coverage for a macro cell, pico cell, femto cell, and/or other types of cells. A macro cell typically covers a relatively large geographic area (e.g., a range with a radius of several kilometers) and may allow unrestricted access by UEs with service subscriptions with the network provider. Pico cells generally cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions with the network provider. Femto cells also typically cover relatively small geographic areas (e.g., homes), and may provide restricted access by UEs having a association with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs of users in a home, etc.) in addition to unrestricted access. The enbs of the macro cell may be referred to as macro enbs. An eNB for a pico cell may be referred to as a pico eNB. And, an eNB of a femto cell may be referred to as a femto eNB or a home eNB.
UE: the UE is a device in LTE that accesses the network side through the eNB, and may be a handheld terminal, a laptop, or other devices that can access the network. When a UE needs to transmit Uplink data in a specific Channel (for example, a Physical Uplink Shared Channel, PUSCH for short), the UE needs to inform an eNB, the UE has Uplink data to transmit, and after knowing that the UE needs to transmit Uplink and downlink data, the eNB performs Uplink data scheduling for the UE.
Interface S1: is the standard interface between the eNB and the core network. The eNB is connected with the MME through an S1-MME interface and is used for controlling the transmission of signaling; the eNB is connected with the S-GW through an S1-U interface and is used for transmitting user data. Wherein the S1-MME interface and the S1-U interface are collectively called S1 interface.
X2 interface: and the standard interface between the eNB and the eNB is used for realizing the intercommunication between the base stations.
A Uu interface: the Uu interface is a radio interface between the UE and the eNB, and the UE accesses the LTE network through the Uu interface.
The data communication method of the embodiment of the invention is mainly applied to information interacted between UE and a Uu interface of a base station eNB, the eNB sends first-stage uplink scheduling permission information to the UE, the first-stage uplink scheduling permission information comprises first indication information used for indicating identifiers of a plurality of uplink subframes on a scheduled second frequency spectrum, the second frequency spectrum is an unauthorized frequency spectrum, the UE determines the scheduled uplink subframes by analyzing the first-stage uplink scheduling permission information, and sends uplink data to the eNB in the determined uplink subframes.
The data communication method provided by the embodiment of the present invention will be described and explained with reference to fig. 2 to fig. 3.
Fig. 2 is a schematic flow chart of a data communication method according to an embodiment of the present invention; this embodiment is mainly described from the user equipment side, and as shown in fig. 2, the data communication method includes:
s100, receiving first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, wherein the first-stage uplink scheduling grant information includes first indication information for indicating identifiers of a plurality of uplink subframes on a scheduled second spectrum, and the second spectrum is an unlicensed spectrum;
in the embodiment of the present invention, the distribution of the uplink and downlink subframes in the unlicensed frequency band in the LAA system is determined based on the service requirement and the LBT result, for example, when the uplink service requirement is high, the uplink subframe number may be greater than the downlink subframe number, so that one downlink subframe is required to schedule a plurality of uplink subframes.
The base station side determines a plurality of uplink subframes to be scheduled, and generates first-stage uplink scheduling grant Information in an LAA system, wherein the first-stage uplink scheduling grant Information comprises first indication Information used for indicating identifiers of the plurality of uplink subframes on a scheduled second spectrum, the second spectrum is an unlicensed spectrum, and the first-stage uplink scheduling grant Information is sent to the user equipment side through Downlink Control Information (DCI) of a first Downlink subframe. And the user equipment receives first-stage uplink scheduling grant information sent by the base station through the first downlink subframe.
It should be noted that the first-stage uplink scheduling grant information may be transmitted through a downlink subframe of a licensed spectrum (i.e., the first spectrum) or may be transmitted through a downlink subframe of an unlicensed spectrum (i.e., the second spectrum). Preferably, in order to ensure the stability of the first-stage uplink scheduling grant information transmission, the downlink subframe of the licensed spectrum may be used for transmission.
Optionally, the first indication information in the embodiment of the present invention may multiplex an existing downlink control information format (dcifomat), and the user performs detection on different DCI formats in a blind detection manner, and increasing a new DCI format means increasing the number of blind detections of the user equipment, which may improve implementation complexity and power consumption of the user equipment. According to the embodiment of the invention, the multiplexing of the existing DCI format to carry the first indication information can reduce the complexity of UE blind detection, and the multiplexing of the existing DCI format does not need to generate a new DCI format, so that the control signaling overhead can be controlled at a lower level.
As an optional implementation, the first indication information may indicate whether a plurality of subframes are scheduled or not in a bitmap manner, that is, the first indication information includes a plurality of character bits, the plurality of character bits are used to indicate whether a plurality of subframes are scheduled or not, one character corresponds to one subframe, where a first character is used to indicate that the corresponding subframe is scheduled, a second character is used to indicate that the corresponding subframe is not scheduled, for example, a bit "1" may indicate that the corresponding subframe is scheduled, and a bit "0" indicates that the corresponding subframe is not scheduled.
Specifically, optionally, the plurality of character bits may be represented by setting a redundant bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information field includes at least one of a Redundancy Version (RV) field, a Channel Status Indication (CSI) request field, and a Sounding Reference Signal (SRS) request field.
For example, the sequence numbers of the scheduled uplink subframes can be represented by jointly using a 3-bit CSI request field and a 1-bit SRS request in a bit mapping manner, where a subframe corresponding to a bit set to "1" is the scheduled subframe. For example, the 4-bit information field is set to 1011, that is, the scheduled uplink subframe number is the 1 st, 3rd, 4 th subframe after receiving the uplink scheduling grant information of the first stage for 4 ms.
As another optional implementation manner, the first indication information includes a starting subframe identifier of a plurality of subframes that are scheduled to be consecutive and a total length of the plurality of subframes, and optionally, the total length of the plurality of subframes may be the number of subframes of the plurality of subframes or the total duration of the plurality of subframes.
Specifically, optionally, the starting subframe identifier and the total length of the multiple subframes may be represented by setting a redundancy bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, a frame structure includes 10 subframes, where the 10 subframes in the frame structure are respectively numbered as 1, 2, 3, and 4 … 10 according to a time sequence, and if it is required to continuously schedule a 4 th subframe to a 6 th subframe, the first indication information may include a starting subframe identifier 4 and the number of the scheduled multiple subframes 3.
As another optional implementation manner, the first indication information includes a starting subframe identifier and an ending subframe identifier of a plurality of scheduled consecutive subframes, and optionally, in one frame structure, one subframe identifier is uniquely allocated to each subframe, for example, a subframe number may be used.
Specifically, optionally, the start subframe identifier and the end subframe identifiers of the multiple subframes may be represented by setting a redundancy bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, one frame structure includes 10 subframes, where the 10 subframes in the frame structure are respectively numbered as 1, 2, 3, and 4 … 10 according to a time sequence, and if it is required to continuously schedule the 4 th subframe to the 6 th subframe, the first indication information may include an identifier of the 4 th subframe and an identifier of the 6 th subframe.
S101, according to the first indication information, determining the plurality of scheduled uplink subframes, and performing uplink data transmission on the plurality of uplink subframes.
In the embodiment of the invention, the user equipment side receives the uplink scheduling grant information transmitted by the base station through the first downlink subframe, analyzes the first indication information in the uplink scheduling grant information, and determines a plurality of scheduled uplink subframes, so that uplink data is transmitted on the determined plurality of uplink subframes.
Specifically, optionally, the scheduled multiple subframe identifiers are obtained by identifying redundant bits and/or preset idle information fields of the preset information fields in the DCI of the first downlink subframe, so as to transmit uplink data.
In the embodiment of the invention, user equipment receives first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, the first-stage uplink scheduling grant information comprises first indication information used for indicating identifiers of a plurality of uplink subframes on a scheduled second frequency spectrum, wherein the second frequency spectrum is an unlicensed frequency spectrum, the scheduled plurality of uplink subframes are determined according to the first indication information, and uplink data are sent on the determined plurality of uplink subframes. In this way, the indication information contained in the uplink scheduling grant information of the downlink subframe indicates the identifiers of the scheduled multiple uplink subframes, so that the signaling overhead is saved.
Referring to fig. 3, a flowchart of another data communication method according to an embodiment of the present invention is shown, where the embodiment is mainly described from a user equipment side, and as shown in fig. 3, the data communication method according to the embodiment includes:
s200, receiving second-stage uplink scheduling grant information sent by the base station through a second downlink subframe, wherein the second-stage uplink scheduling grant information includes second indication information for indicating that uplink multi-subframe scheduling is performed on the second spectrum.
In the embodiment of the present invention, in order to instruct the user equipment to perform uplink multi-subframe scheduling on the second spectrum, the base station sends second-stage uplink scheduling grant information to the user equipment through the second downlink subframe, where the second-stage uplink scheduling grant information includes second indication information for instructing to perform uplink multi-subframe scheduling. And the user equipment receives the second downlink subframe, acquires multi-subframe scheduling by analyzing second indication information in second-stage uplink scheduling permission information of the second downlink subframe, so that the DCI of the first subframe is analyzed in the next received first downlink subframe according to a preset encapsulation format of the multi-subframe scheduling, a plurality of scheduled uplink subframe identifications are obtained, and uplink data are sent on the uplink subframes.
Optionally, the second indication information is carried by a preset idle information field in the downlink control information DCI of the second downlink subframe; or, the second indication information is carried by redundant bits of a preset information field in the downlink control information DCI of the second downlink subframe. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, in the second-stage uplink scheduling grant information of the second downlink subframe, the redundancy bit of the preset information field in the DCI is set to a redundancy value (i.e., a value that is not defined in the original system and/or is not used in some specific scenarios), so as to indicate that the redundancy bit is a special control information for performing uplink multi-subframe scheduling. For example, including but not limited to: setting a 2-bit information field in a New Data Indicators (NDI) field to 00 (only 10, 01,11 in the information field are endowed with meanings in the original system, but 00 is not endowed with meanings), and performing uplink multi-subframe scheduling through the redundant bit indicators.
It should be noted that the second scheduling grant information may be transmitted through a downlink subframe of the licensed spectrum (i.e., the first spectrum) or may be transmitted through a downlink subframe of the unlicensed spectrum (i.e., the second spectrum). Preferably, in order to ensure the stability of the transmission of the uplink scheduling grant information in the second stage, the downlink subframe of the licensed spectrum may be used for transmission.
S201, receiving first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, where the first-stage uplink scheduling grant information includes first indication information for indicating identities of a plurality of uplink subframes on a scheduled second spectrum, where the second spectrum is an unlicensed spectrum;
s202, according to the first indication information, determining the plurality of scheduled uplink subframes, and performing uplink data transmission on the plurality of uplink subframes.
Referring to steps S100 to S101 of fig. 2, steps S201 to S202 of the embodiment of the present invention are not described herein again.
It should be noted that, in the embodiment of the present invention, the transmission of the uplink scheduling grant information corresponding to the uplink data transmission may be divided into one-stage transmission (one-time transmission) or two-stage transmission (divided into two transmissions). If the one-phase transmission is adopted (that is, only the first phase exists), the ue may receive first-phase uplink scheduling grant information transmitted by the base station through the first downlink subframe, where the first-phase uplink scheduling grant information includes first indication information indicating identities of a plurality of uplink subframes on a scheduled second spectrum, where the second spectrum is an unlicensed spectrum, determine, according to the first indication information, the scheduled plurality of uplink subframes, and perform uplink data transmission on the determined plurality of uplink subframes. If the two-stage transmission is adopted (that is, there are not only the first stage but also the second stage), the second-stage uplink scheduling grant information may be a common and semi-static grant information, may include second indication information for indicating uplink multi-subframe scheduling on the second spectrum, and may further include Resource Block (RB) allocation information, MCS level information, and the like; the first-stage uplink scheduling grant information may be scheduling information of a specific uplink data transmission, and may include, for example, first indication information indicating an identification of a plurality of uplink subframes on the scheduled second spectrum, which may trigger the PUSCH channel to transmit on a certain subframe. The first phase and the second phase described in this embodiment are only used to indicate that the sending time of the information is different, and the first phase does not indicate that the second phase is prior to the first phase in terms of time sequence. The second-stage uplink scheduling grant information may be transmitted before the first-stage uplink scheduling grant information. The method for performing uplink scheduling in one stage is relatively simple, but in order to avoid the occurrence of scheduling failure caused by LBT failure as much as possible, the method for performing uplink scheduling in the two-stage uplink grant information mode is proved to be beneficial in the aspect of improving scheduling efficiency.
In the embodiment of the invention, user equipment receives first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, the first-stage uplink scheduling grant information comprises first indication information used for indicating identifiers of a plurality of uplink subframes on a scheduled second frequency spectrum, wherein the second frequency spectrum is an unlicensed frequency spectrum, the scheduled plurality of uplink subframes are determined according to the first indication information, and uplink data are sent on the determined plurality of uplink subframes. In this way, the indication information contained in the uplink scheduling grant information of the downlink subframe indicates the identifiers of the scheduled multiple uplink subframes, so that the signaling overhead is saved.
Referring to fig. 4, a flowchart of another data communication method according to an embodiment of the present invention is shown, where the embodiment is mainly described from a base station side, and as shown in fig. 4, the data communication method according to the embodiment of the present invention includes the following steps:
s300, generating first-stage uplink scheduling grant information, wherein the first-stage uplink scheduling grant information includes first indication information for indicating identifiers of a plurality of uplink subframes on a second spectrum scheduled by user equipment, and the second spectrum is an unlicensed spectrum;
in the embodiment of the present invention, the distribution of the uplink and downlink subframes in the unlicensed frequency band in the LAA system is determined based on the service requirement and the LBT result, for example, when the uplink service requirement is high, the uplink subframe number may be greater than the downlink subframe number, so that one downlink subframe is required to schedule a plurality of uplink subframes.
The base station side determines a plurality of uplink subframes to be scheduled, and generates first-stage uplink scheduling grant Information in an LAA system, wherein the first-stage uplink scheduling grant Information comprises first indication Information used for indicating identifiers of the plurality of uplink subframes on a scheduled second spectrum, the second spectrum is an unlicensed spectrum, and the first-stage uplink scheduling grant Information is sent to the user equipment side through Downlink Control Information (DCI) of a first Downlink subframe. And the user equipment receives first-stage uplink scheduling grant information sent by the base station through the first downlink subframe.
Optionally, the first indication information in the embodiment of the present invention may multiplex an existing downlink control information format (dcifomat), and the user performs detection on different DCI formats in a blind detection manner, and increasing a new DCI format means increasing the number of blind detections of the user equipment, which may improve implementation complexity and power consumption of the user equipment. According to the embodiment of the invention, the multiplexing of the existing DCI format to carry the first indication information can reduce the complexity of UE blind detection, and the multiplexing of the existing DCI format does not need to generate a new DCI format, so that the control signaling overhead can be controlled at a lower level.
As an optional implementation, the first indication information may indicate whether a plurality of subframes are scheduled or not in a bitmap manner, that is, the first indication information includes a plurality of character bits, the plurality of character bits are used to indicate whether a plurality of subframes are scheduled or not, one character corresponds to one subframe, where a first character is used to indicate that the corresponding subframe is scheduled, a second character is used to indicate that the corresponding subframe is not scheduled, for example, a bit "1" may indicate that the corresponding subframe is scheduled, and a bit "0" indicates that the corresponding subframe is not scheduled.
Specifically, optionally, the plurality of character bits may be represented by setting a redundant bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information field includes at least one of a Redundancy Version (RV) field, a Channel Status Indication (CSI) request field, and a Sounding Reference Signal (SRS) request field.
For example, the sequence numbers of the scheduled uplink subframes can be represented by jointly using a 3-bit CSI request field and a 1-bit SRS request in a bit mapping manner, where a subframe corresponding to a bit set to "1" is the scheduled subframe. For example, the 4-bit information field is set to 1011, that is, the scheduled uplink subframe number is the 1 st, 3rd, 4 th subframe after receiving the uplink scheduling grant information of the first stage for 4 ms.
As another optional implementation manner, the first indication information includes a starting subframe identifier of a plurality of subframes that are scheduled to be consecutive and a total length of the plurality of subframes, and optionally, the total length of the plurality of subframes may be the number of subframes of the plurality of subframes or the total duration of the plurality of subframes.
Specifically, optionally, the starting subframe identifier and the total length of the multiple subframes may be represented by setting a redundancy bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, a frame structure includes 10 subframes, where the 10 subframes in the frame structure are respectively numbered as 1, 2, 3, and 4 … 10 according to a time sequence, and if it is required to continuously schedule a 4 th subframe to a 6 th subframe, the first indication information may include a starting subframe identifier 4 and the number of the scheduled multiple subframes 3.
As another optional implementation manner, the first indication information includes a starting subframe identifier and an ending subframe identifier of a plurality of scheduled consecutive subframes, and optionally, in one frame structure, one subframe identifier is uniquely allocated to each subframe, for example, a subframe number may be used.
Specifically, optionally, the start subframe identifier and the end subframe identifiers of the multiple subframes may be represented by setting a redundancy bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, one frame structure includes 10 subframes, where the 10 subframes in the frame structure are respectively numbered as 1, 2, 3, and 4 … 10 according to a time sequence, and if it is required to continuously schedule the 4 th subframe to the 6 th subframe, the first indication information may include an identifier of the 4 th subframe and an identifier of the 6 th subframe.
S301, sending the first-stage uplink scheduling grant information to the ue through a first downlink subframe.
In this embodiment of the present invention, the first-stage uplink scheduling grant information may be sent through a downlink subframe of a licensed spectrum (i.e., a first spectrum), or may be sent through a downlink subframe of an unlicensed spectrum (i.e., a second spectrum). Preferably, in order to ensure the stability of the first-stage uplink scheduling grant information transmission, the downlink subframe of the licensed spectrum may be used for transmission.
Optionally, before generating the first-stage uplink scheduling grant information, the method further includes steps S302 to S303:
s302, generating second-stage uplink scheduling grant information, wherein the second-stage uplink scheduling grant information includes second indication information for indicating the user equipment to perform uplink multi-subframe scheduling on the second spectrum;
s303, sending the second-stage uplink scheduling grant information to the ue through a second downlink subframe.
In the embodiment of the present invention, in order to instruct the user equipment to perform uplink multi-subframe scheduling on the second spectrum, the base station sends second-stage uplink scheduling grant information to the user equipment through the second downlink subframe, where the second-stage uplink scheduling grant information includes second indication information for instructing to perform uplink multi-subframe scheduling. And the user equipment receives the second downlink subframe, acquires multi-subframe scheduling by analyzing second indication information in second-stage uplink scheduling permission information of the second downlink subframe, so that the DCI of the first subframe is analyzed in the next received first downlink subframe according to a preset encapsulation format of the multi-subframe scheduling, a plurality of scheduled uplink subframe identifications are obtained, and uplink data are sent on the uplink subframes.
Optionally, the second indication information is carried by a preset idle information field in the downlink control information DCI of the second downlink subframe; or, the second indication information is carried by redundant bits of a preset information field in the downlink control information DCI of the second downlink subframe. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, in the second-stage uplink scheduling grant information of the second downlink subframe, the redundancy bit of the preset information field in the DCI is set to a redundancy value (i.e., a value that is not defined in the original system and/or is not used in some specific scenarios), so as to indicate that the redundancy bit is a special control information for performing uplink multi-subframe scheduling. For example, including but not limited to: setting a 2-bit information field in a New Data Indicators (NDI) field to 00 (only 10, 01,11 in the information field are endowed with meanings in the original system, but 00 is not endowed with meanings), and performing uplink multi-subframe scheduling through the redundant bit indicators.
It should be noted that the second scheduling grant information may be transmitted through a downlink subframe of the licensed spectrum (i.e., the first spectrum) or may be transmitted through a downlink subframe of the unlicensed spectrum (i.e., the second spectrum). Preferably, in order to ensure the stability of the transmission of the uplink scheduling grant information in the second stage, the downlink subframe of the licensed spectrum may be used for transmission.
In the embodiment of the invention, user equipment receives first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, the first-stage uplink scheduling grant information comprises first indication information used for indicating identifiers of a plurality of uplink subframes on a scheduled second frequency spectrum, wherein the second frequency spectrum is an unlicensed frequency spectrum, the scheduled plurality of uplink subframes are determined according to the first indication information, and uplink data are sent on the determined plurality of uplink subframes. In this way, the indication information contained in the uplink scheduling grant information of the downlink subframe indicates the identifiers of the scheduled multiple uplink subframes, so that the signaling overhead is saved.
The following describes a specific implementation of the data communication apparatus according to the embodiment of the present invention with reference to fig. 5 to 8. The data communication apparatus shown in fig. 5 and 6 can be applied to the user equipment side, and the data communication apparatus shown in fig. 7 to 8 can be applied to the base station side.
Referring to fig. 5, a schematic structural diagram of a data communication apparatus according to an embodiment of the present invention is provided, where the data communication apparatus may be applied to a user equipment, such as any UE in fig. 1, and as shown in fig. 4, the data communication apparatus according to the embodiment includes: a transceiver unit 100 and a processing unit 101.
A transceiver unit 100, configured to receive first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, where the first-stage uplink scheduling grant information includes first indication information indicating identities of a plurality of uplink subframes on a scheduled second spectrum, where the second spectrum is an unlicensed spectrum;
in the embodiment of the present invention, the distribution of the uplink and downlink subframes in the unlicensed frequency band in the LAA system is determined based on the service requirement and the LBT result, for example, when the uplink service requirement is high, the uplink subframe number may be greater than the downlink subframe number, so that one downlink subframe is required to schedule a plurality of uplink subframes.
The base station side determines a plurality of uplink subframes to be scheduled, and generates first-stage uplink scheduling grant information in an LAA system, wherein the first-stage uplink scheduling grant information comprises first indication information used for indicating identifiers of the plurality of uplink subframes on a scheduled second spectrum, the second spectrum is an unlicensed spectrum, and the first-stage uplink scheduling grant information is sent to the user equipment side through Downlink Control Information (DCI) of a first Downlink subframe. And the user equipment receives first-stage uplink scheduling grant information sent by the base station through the first downlink subframe.
It should be noted that the first-stage uplink scheduling grant information may be transmitted through a downlink subframe of a licensed spectrum (i.e., the first spectrum) or may be transmitted through a downlink subframe of an unlicensed spectrum (i.e., the second spectrum). Preferably, in order to ensure the stability of the first-stage uplink scheduling grant information transmission, the downlink subframe of the licensed spectrum may be used for transmission.
Optionally, the first indication information in the embodiment of the present invention may multiplex an existing downlink control information format (dcifomat), and the user performs detection on different DCI formats in a blind detection manner, and increasing a new DCI format means increasing the number of blind detections of the user equipment, which may improve implementation complexity and power consumption of the user equipment. According to the embodiment of the invention, the multiplexing of the existing DCI format to carry the first indication information can reduce the complexity of UE blind detection, and the multiplexing of the existing DCI format does not need to generate a new DCI format, so that the control signaling overhead can be controlled at a lower level.
As an optional implementation, the first indication information may indicate whether a plurality of subframes are scheduled or not in a bitmap manner, that is, the first indication information includes a plurality of character bits, the plurality of character bits are used to indicate whether a plurality of subframes are scheduled or not, one character corresponds to one subframe, where a first character is used to indicate that the corresponding subframe is scheduled, a second character is used to indicate that the corresponding subframe is not scheduled, for example, a bit "1" may indicate that the corresponding subframe is scheduled, and a bit "0" indicates that the corresponding subframe is not scheduled.
Specifically, optionally, the plurality of character bits may be represented by setting a redundant bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information field includes at least one of a Redundancy Version (RV) field, a Channel Status Indication (CSI) request field, and a Sounding Reference Signal (SRS) request field.
For example, the sequence numbers of the scheduled uplink subframes can be represented by jointly using a 3-bit CSI request field and a 1-bit SRS request in a bit mapping manner, where a subframe corresponding to a bit set to "1" is the scheduled subframe. For example, the 4-bit information field is set to 1011, that is, the scheduled uplink subframe number is the 1 st, 3rd, 4 th subframe after receiving the uplink scheduling grant information of the first stage for 4 ms.
As another optional implementation manner, the first indication information includes a starting subframe identifier of a plurality of subframes that are scheduled to be consecutive and a total length of the plurality of subframes, and optionally, the total length of the plurality of subframes may be the number of subframes of the plurality of subframes or the total duration of the plurality of subframes.
Specifically, optionally, the starting subframe identifier and the total length of the multiple subframes may be represented by setting a redundancy bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, a frame structure includes 10 subframes, where the 10 subframes in the frame structure are respectively numbered as 1, 2, 3, and 4 … 10 according to a time sequence, and if it is required to continuously schedule a 4 th subframe to a 6 th subframe, the first indication information may include a starting subframe identifier 4 and the number of the scheduled multiple subframes 3.
As another optional implementation manner, the first indication information includes a starting subframe identifier and an ending subframe identifier of a plurality of scheduled consecutive subframes, and optionally, in one frame structure, one subframe identifier is uniquely allocated to each subframe, for example, a subframe number may be used.
Specifically, optionally, the start subframe identifier and the end subframe identifiers of the multiple subframes may be represented by setting a redundancy bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, one frame structure includes 10 subframes, where the 10 subframes in the frame structure are respectively numbered as 1, 2, 3, and 4 … 10 according to a time sequence, and if it is required to continuously schedule the 4 th subframe to the 6 th subframe, the first indication information may include an identifier of the 4 th subframe and an identifier of the 6 th subframe.
A processing unit 101, configured to determine the scheduled multiple uplink subframes according to the first indication information;
the transceiver unit 100 is further configured to perform uplink data transmission on the scheduled multiple uplink subframes.
In the embodiment of the invention, the user equipment side receives the uplink scheduling grant information transmitted by the base station through the first downlink subframe, analyzes the first indication information in the uplink scheduling grant information, and determines a plurality of scheduled uplink subframes, so that uplink data is transmitted on the determined plurality of uplink subframes.
Specifically, optionally, the scheduled multiple subframe identifiers are obtained by identifying redundant bits and/or preset idle information fields of the preset information fields in the DCI of the first downlink subframe, so as to transmit uplink data.
Further optionally, the transceiver unit 100 is further configured to receive second-stage uplink scheduling grant information sent by the base station through a second downlink subframe before receiving the first-stage uplink scheduling grant information sent by the base station through the first downlink subframe, where the second-stage uplink scheduling grant information includes second indication information for indicating that uplink multi-subframe scheduling is performed on the second spectrum.
In the embodiment of the present invention, in order to instruct the user equipment to perform uplink multi-subframe scheduling on the second spectrum, the base station sends second-stage uplink scheduling grant information to the user equipment through the second downlink subframe, where the second-stage uplink scheduling grant information includes second indication information for instructing to perform uplink multi-subframe scheduling. And the user equipment receives the second downlink subframe, acquires multi-subframe scheduling by analyzing second indication information in second-stage uplink scheduling permission information of the second downlink subframe, so that the DCI of the first subframe is analyzed in the next received first downlink subframe according to a preset encapsulation format of the multi-subframe scheduling, a plurality of scheduled uplink subframe identifications are obtained, and uplink data are sent on the uplink subframes.
Optionally, the second indication information is carried by a preset idle information field in the downlink control information DCI of the second downlink subframe; or, the second indication information is carried by redundant bits of a preset information field in the downlink control information DCI of the second downlink subframe. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, in the second-stage uplink scheduling grant information of the second downlink subframe, the redundancy bit of the preset information field in the DCI is set to a redundancy value (i.e., a value that is not defined in the original system and/or is not used in some specific scenarios), so as to indicate that the redundancy bit is a special control information for performing uplink multi-subframe scheduling. For example, including but not limited to: setting a 2-bit information field in a New Data Indicators (NDI) field to 00 (only 10, 01,11 in the information field are endowed with meanings in the original system, but 00 is not endowed with meanings), and performing uplink multi-subframe scheduling through the redundant bit indicators.
It should be noted that the second scheduling grant information may be transmitted through a downlink subframe of the licensed spectrum (i.e., the first spectrum) or may be transmitted through a downlink subframe of the unlicensed spectrum (i.e., the second spectrum). Preferably, in order to ensure the stability of the transmission of the uplink scheduling grant information in the second stage, the downlink subframe of the licensed spectrum may be used for transmission.
It should be noted that, in the embodiment of the present invention, the transmission of the uplink scheduling grant information corresponding to the uplink data transmission may be divided into one-stage transmission (one-time transmission) or two-stage transmission (divided into two transmissions). If the one-phase transmission is adopted (that is, only the first phase exists), the ue may receive first-phase uplink scheduling grant information transmitted by the base station through the first downlink subframe, where the first-phase uplink scheduling grant information includes first indication information indicating identities of a plurality of uplink subframes on a scheduled second spectrum, where the second spectrum is an unlicensed spectrum, determine, according to the first indication information, the scheduled plurality of uplink subframes, and perform uplink data transmission on the determined plurality of uplink subframes. If the two-stage transmission is adopted (that is, there are not only the first stage but also the second stage), the second-stage uplink scheduling grant information may be a common and semi-static grant information, may include second indication information for indicating uplink multi-subframe scheduling on the second spectrum, and may further include Resource Block (RB) allocation information, MCS level information, and the like; the first-stage uplink scheduling grant information may be scheduling information of a specific uplink data transmission, and may include, for example, first indication information indicating an identification of a plurality of uplink subframes on the scheduled second spectrum, which may trigger the PUSCH channel to transmit on a certain subframe. The first phase and the second phase described in this embodiment are only used to indicate that the sending time of the information is different, and the first phase does not indicate that the second phase is prior to the first phase in terms of time sequence. The second-stage uplink scheduling grant information may be transmitted before the first-stage uplink scheduling grant information. The method for performing uplink scheduling in one stage is relatively simple, but in order to avoid the occurrence of scheduling failure caused by LBT failure as much as possible, the method for performing uplink scheduling in the two-stage uplink grant information mode is proved to be beneficial in the aspect of improving scheduling efficiency.
In the embodiment of the invention, user equipment receives first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, the first-stage uplink scheduling grant information comprises first indication information used for indicating identifiers of a plurality of uplink subframes on a scheduled second frequency spectrum, wherein the second frequency spectrum is an unlicensed frequency spectrum, the scheduled plurality of uplink subframes are determined according to the first indication information, and uplink data are sent on the determined plurality of uplink subframes. In this way, the indication information contained in the uplink scheduling grant information of the downlink subframe indicates the identifiers of the scheduled multiple uplink subframes, so that the signaling overhead is saved.
Referring to fig. 6, a schematic structural diagram of another data communication apparatus according to an embodiment of the present invention is provided, where the data communication apparatus may be applied to a user equipment, and the data communication apparatus 1000 includes a transceiver 1010, a memory 1020, and a processor 1030. The user equipment to which the data communication apparatus is applied may be the UE shown in fig. 1.
In particular, processor 1030 controls the operation of data communication device 1000. Memory 1020 may include read-only memory and random-access memory, and provides instructions and data to processor 1030, which may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device. A portion of the memory 1020 may also include non-volatile row random access memory (NVRAM). The various components of the data communications device 1000 are coupled together by a bus 1040, wherein the bus system 1040 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are labeled in the figure as the bus system 1040. It should be noted that the above description of the structure of the data communication apparatus can be applied to the following embodiments.
A transceiver 1010, configured to receive first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, where the first-stage uplink scheduling grant information includes first indication information indicating identities of a plurality of uplink subframes on a scheduled second spectrum, where the second spectrum is an unlicensed spectrum;
a processor 1030, configured to determine the plurality of scheduled uplink subframes according to the first indication information;
the transceiver 1010 is further configured to perform uplink data transmission on the scheduled plurality of uplink subframes.
Optionally, the first indication information includes a plurality of character bits, where the plurality of character bits are used to indicate whether a plurality of subframes are scheduled, and one character corresponds to one subframe, where a first character is used to indicate that the corresponding subframe is scheduled, and a second character is used to indicate that the corresponding subframe is not scheduled.
Optionally, the first indication information includes a starting subframe identifier of a plurality of scheduled consecutive subframes and a total length of the plurality of subframes; or,
the first indication information comprises a starting subframe identification and an ending subframe identification of a scheduled continuous plurality of subframes.
The first indication information is carried by a preset idle information domain in Downlink Control Information (DCI) of the first downlink subframe; or,
the first indication information is carried by redundant bits of a preset information field in downlink control information DCI of the first downlink subframe.
The preset idle information field comprises at least one of a Redundancy Version (RV) field, a Channel State Indication (CSI) request field and a Sounding Reference Signal (SRS) request field.
Further optionally, the transceiver 1010 is further configured to receive second-stage uplink scheduling grant information sent by the base station through a second downlink subframe, where the second-stage uplink scheduling grant information includes second indication information for indicating uplink multi-subframe scheduling on a second spectrum.
The second indication information is carried by a preset idle information domain in Downlink Control Information (DCI) of the second downlink subframe; or,
the second indication information is carried by redundant bits of a preset information field in downlink control information DCI of the second downlink subframe.
The preset idle information field comprises at least one of a Redundancy Version (RV) field, a Channel State Indication (CSI) request field and a Sounding Reference Signal (SRS) request field.
Optionally, the first-stage uplink scheduling grant information is sent through a first downlink subframe of a first spectrum; the second-stage uplink scheduling grant information is sent through a second downlink subframe of the first spectrum; wherein the first spectrum is a licensed spectrum.
It should be noted that, in the embodiment of the present invention, the transmission of the uplink scheduling grant information corresponding to the uplink data transmission may be divided into one-stage transmission (one-time transmission) or two-stage transmission (divided into two transmissions). If the one-phase transmission is adopted (that is, only the first phase exists), the ue may receive first-phase uplink scheduling grant information transmitted by the base station through the first downlink subframe, where the first-phase uplink scheduling grant information includes first indication information indicating identities of a plurality of uplink subframes on a scheduled second spectrum, where the second spectrum is an unlicensed spectrum, determine, according to the first indication information, the scheduled plurality of uplink subframes, and perform uplink data transmission on the determined plurality of uplink subframes. If the two-stage transmission is adopted (that is, there are not only the first stage but also the second stage), the second-stage uplink scheduling grant information may be a common and semi-static grant information, may include second indication information for indicating uplink multi-subframe scheduling on the second spectrum, and may further include Resource Block (RB) allocation information, MCS level information, and the like; the first-stage uplink scheduling grant information may be scheduling information of a specific uplink data transmission, and may include, for example, first indication information indicating an identification of a plurality of uplink subframes on the scheduled second spectrum, which may trigger the PUSCH channel to transmit on a certain subframe. The first phase and the second phase described in this embodiment are only used to indicate that the sending time of the information is different, and the first phase does not indicate that the second phase is prior to the first phase in terms of time sequence. The second-stage uplink scheduling grant information may be transmitted before the first-stage uplink scheduling grant information. The method for performing uplink scheduling in one stage is relatively simple, but in order to avoid the occurrence of scheduling failure caused by LBT failure as much as possible, the method for performing uplink scheduling in the two-stage uplink grant information mode is proved to be beneficial in the aspect of improving scheduling efficiency.
In the embodiment of the invention, user equipment receives first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, the first-stage uplink scheduling grant information comprises first indication information used for indicating identifiers of a plurality of uplink subframes on a scheduled second frequency spectrum, wherein the second frequency spectrum is an unlicensed frequency spectrum, the scheduled plurality of uplink subframes are determined according to the first indication information, and uplink data are sent on the determined plurality of uplink subframes. In this way, the indication information contained in the uplink scheduling grant information of the downlink subframe indicates the identifiers of the scheduled multiple uplink subframes, so that the signaling overhead is saved.
Referring to fig. 7, which is a schematic structural diagram of another data communication device according to an embodiment of the present invention, the data communication device of this embodiment may be applied to a base station side, and as shown in the figure, the data communication device according to the embodiment of the present invention includes a generating unit 200 and a transmitting/receiving unit 201;
a generating unit 200, configured to generate first-stage uplink scheduling grant information, where the first-stage uplink scheduling grant information includes first indication information indicating identities of a plurality of uplink subframes on a second spectrum scheduled by a user equipment, and the second spectrum is an unlicensed spectrum;
in the embodiment of the present invention, the distribution of the uplink and downlink subframes in the unlicensed frequency band in the LAA system is determined based on the service requirement and the LBT result, for example, when the uplink service requirement is high, the uplink subframe number may be greater than the downlink subframe number, so that one downlink subframe is required to schedule a plurality of uplink subframes.
The base station side determines a plurality of uplink subframes to be scheduled, and generates first-stage uplink scheduling grant Information in an LAA system, wherein the first-stage uplink scheduling grant Information comprises first indication Information used for indicating identifiers of the plurality of uplink subframes on a scheduled second spectrum, the second spectrum is an unlicensed spectrum, and the first-stage uplink scheduling grant Information is sent to the user equipment side through Downlink Control Information (DCI) of a first Downlink subframe. And the user equipment receives first-stage uplink scheduling grant information sent by the base station through the first downlink subframe.
Optionally, the first indication information in the embodiment of the present invention may multiplex an existing downlink control information format (dcifomat), and the user performs detection on different DCI formats in a blind detection manner, and increasing a new DCI format means increasing the number of blind detections of the user equipment, which may improve implementation complexity and power consumption of the user equipment. According to the embodiment of the invention, the multiplexing of the existing DCI format to carry the first indication information can reduce the complexity of UE blind detection, and the multiplexing of the existing DCI format does not need to generate a new DCI format, so that the control signaling overhead can be controlled at a lower level.
As an optional implementation, the first indication information may indicate whether a plurality of subframes are scheduled or not in a bitmap manner, that is, the first indication information includes a plurality of character bits, the plurality of character bits are used to indicate whether a plurality of subframes are scheduled or not, one character corresponds to one subframe, where a first character is used to indicate that the corresponding subframe is scheduled, a second character is used to indicate that the corresponding subframe is not scheduled, for example, a bit "1" may indicate that the corresponding subframe is scheduled, and a bit "0" indicates that the corresponding subframe is not scheduled.
Specifically, optionally, the plurality of character bits may be represented by setting a redundant bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information field includes at least one of a Redundancy Version (RV) field, a Channel Status Indication (CSI) request field, and a Sounding Reference Signal (SRS) request field.
For example, the sequence numbers of the scheduled uplink subframes can be represented by jointly using a 3-bit CSI request field and a 1-bit SRS request in a bit mapping manner, where a subframe corresponding to a bit set to "1" is the scheduled subframe. For example, the 4-bit information field is set to 1011, that is, the scheduled uplink subframe number is the 1 st, 3rd, 4 th subframe after receiving the uplink scheduling grant information of the first stage for 4 ms.
As another optional implementation manner, the first indication information includes a starting subframe identifier of a plurality of subframes that are scheduled to be consecutive and a total length of the plurality of subframes, and optionally, the total length of the plurality of subframes may be the number of subframes of the plurality of subframes or the total duration of the plurality of subframes.
Specifically, optionally, the starting subframe identifier and the total length of the multiple subframes may be represented by setting a redundancy bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, a frame structure includes 10 subframes, where the 10 subframes in the frame structure are respectively numbered as 1, 2, 3, and 4 … 10 according to a time sequence, and if it is required to continuously schedule a 4 th subframe to a 6 th subframe, the first indication information may include a starting subframe identifier 4 and the number of the scheduled multiple subframes 3.
As another optional implementation manner, the first indication information includes a starting subframe identifier and an ending subframe identifier of a plurality of scheduled consecutive subframes, and optionally, in one frame structure, one subframe identifier is uniquely allocated to each subframe, for example, a subframe number may be used.
Specifically, optionally, the start subframe identifier and the end subframe identifiers of the multiple subframes may be represented by setting a redundancy bit of a preset information field and/or a preset idle information field in the DCI. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, one frame structure includes 10 subframes, where the 10 subframes in the frame structure are respectively numbered as 1, 2, 3, and 4 … 10 according to a time sequence, and if it is required to continuously schedule the 4 th subframe to the 6 th subframe, the first indication information may include an identifier of the 4 th subframe and an identifier of the 6 th subframe.
A transceiver unit 201, configured to send the first-stage uplink scheduling grant information to the user equipment through a first downlink subframe.
In this embodiment of the present invention, the first-stage uplink scheduling grant information may be sent through a downlink subframe of a licensed spectrum (i.e., a first spectrum), or may be sent through a downlink subframe of an unlicensed spectrum (i.e., a second spectrum). Preferably, in order to ensure the stability of the first-stage uplink scheduling grant information transmission, the downlink subframe of the licensed spectrum may be used for transmission.
Optionally, the generating unit 200 is further configured to generate second-stage uplink scheduling grant information before generating the first-stage uplink scheduling grant information, where the second-stage uplink scheduling grant information includes second indication information for indicating the user equipment to perform uplink multi-subframe scheduling on the second spectrum;
the transceiver unit 201 is further configured to transmit the second-stage uplink scheduling grant information to the user equipment through a second downlink subframe.
In the embodiment of the present invention, in order to instruct the user equipment to perform uplink multi-subframe scheduling on the second spectrum, the base station sends second-stage uplink scheduling grant information to the user equipment through the second downlink subframe, where the second-stage uplink scheduling grant information includes second indication information for instructing to perform uplink multi-subframe scheduling. And the user equipment receives the second downlink subframe, acquires multi-subframe scheduling by analyzing second indication information in second-stage uplink scheduling permission information of the second downlink subframe, so that the DCI of the first subframe is analyzed in the next received first downlink subframe according to a preset encapsulation format of the multi-subframe scheduling, a plurality of scheduled uplink subframe identifications are obtained, and uplink data are sent on the uplink subframes.
Optionally, the second indication information is carried by a preset idle information field in the downlink control information DCI of the second downlink subframe; or, the second indication information is carried by redundant bits of a preset information field in the downlink control information DCI of the second downlink subframe. The preset idle information domain comprises at least one of an RV domain, a CSI request domain and an SRS request domain.
For example, in the second-stage uplink scheduling grant information of the second downlink subframe, the redundancy bit of the preset information field in the DCI is set to a redundancy value (i.e., a value that is not defined in the original system and/or is not used in some specific scenarios), so as to indicate that the redundancy bit is a special control information for performing uplink multi-subframe scheduling. For example, including but not limited to: setting a 2-bit information field in a New Data Indicators (NDI) field to 00 (only 10, 01,11 in the information field are endowed with meanings in the original system, but 00 is not endowed with meanings), and performing uplink multi-subframe scheduling through the redundant bit indicators.
It should be noted that the second scheduling grant information may be transmitted through a downlink subframe of the licensed spectrum (i.e., the first spectrum) or may be transmitted through a downlink subframe of the unlicensed spectrum (i.e., the second spectrum). Preferably, in order to ensure the stability of the transmission of the uplink scheduling grant information in the second stage, the downlink subframe of the licensed spectrum may be used for transmission.
In the embodiment of the invention, user equipment receives first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, the first-stage uplink scheduling grant information comprises first indication information used for indicating identifiers of a plurality of uplink subframes on a scheduled second frequency spectrum, wherein the second frequency spectrum is an unlicensed frequency spectrum, the scheduled plurality of uplink subframes are determined according to the first indication information, and uplink data are sent on the determined plurality of uplink subframes. In this way, the indication information contained in the uplink scheduling grant information of the downlink subframe indicates the identifiers of the scheduled multiple uplink subframes, so that the signaling overhead is saved.
Referring to fig. 8, which is a schematic structural diagram of another data communication device according to an embodiment of the present invention, the data communication device according to the embodiment of the present invention may be applied to a base station side, and the data communication device includes a transceiver 2010, a memory 2020, and a processor 2030.
In particular, processor 2030 controls the operation of data communication device 2000. Memory 2020 may include both read-only memory and random-access memory and provides instructions and data to processor 2030, which may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array, or other programmable logic device. A portion of the memory 2020 may also include non-volatile row random access memory (NVRAM). The various components of the data communications device 2000 are coupled together by a bus 2040, where the bus system 2040 includes a power bus, a control bus, and a status signal bus in addition to a data bus. For clarity of illustration, however, the various buses are designated in the figure as the bus system 2040. It should be noted that the above description of the structure of the data communication apparatus can be applied to the following embodiments.
A processor 2030, configured to generate first stage uplink scheduling grant information, where the first stage uplink scheduling grant information includes first indication information indicating identities of a plurality of uplink subframes on a second spectrum scheduled by a user equipment, and the second spectrum is an unlicensed spectrum;
a transceiver 2010, configured to transmit the first-stage uplink scheduling grant information to the user equipment through a first downlink subframe.
Optionally, processor 2030 is further configured to generate second stage uplink scheduling grant information, where the second stage uplink scheduling grant information includes second indication information for indicating the user equipment to perform uplink multi-subframe scheduling on the second spectrum;
the transceiver 2010 is further configured to transmit the second-stage uplink scheduling grant information to the user equipment through a second downlink subframe.
Optionally, the first-stage uplink scheduling grant information is sent through a first downlink subframe of a first spectrum;
the second-stage uplink scheduling grant information is sent through a second downlink subframe of the first spectrum;
wherein the first spectrum is a licensed spectrum.
In the embodiment of the invention, user equipment receives first-stage uplink scheduling grant information sent by a base station through a first downlink subframe, the first-stage uplink scheduling grant information comprises first indication information used for indicating identifiers of a plurality of uplink subframes on a scheduled second frequency spectrum, wherein the second frequency spectrum is an unlicensed frequency spectrum, the scheduled plurality of uplink subframes are determined according to the first indication information, and uplink data are sent on the determined plurality of uplink subframes. In this way, the indication information contained in the uplink scheduling grant information of the downlink subframe indicates the identifiers of the scheduled multiple uplink subframes, so that the signaling overhead is saved.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The modules in the terminal of the embodiment of the invention can be combined, divided and deleted according to actual needs.
The components such as the microcontroller according to the embodiment of the present invention may be implemented by a general-purpose Integrated Circuit, such as a CPU, or an Application Specific Integrated Circuit (ASIC).
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.