Disclosure of Invention
The invention provides a method, a device and a system for updating TDD configuration, aiming at the problem that updating is not timely caused by an updating mode of TDD configuration in the related technology, and at least solving the problem.
According to an aspect of the present invention, there is provided a TDD configuration updating method, including: a terminal (User Equipment, abbreviated as UE) receives a TDD reconfiguration notification Media Access Control (MAC) Control Element (Control Element, abbreviated as CE), where the MAC CE includes information indicating TDD configuration; and the terminal feeds back at a specified position, and starts to use the TDD configuration indicated in the MAC CE within a preset time after receiving the MAC CE.
Preferably, the MAC CE including the information indicating the TDD configuration includes: the MAC CE comprises TDD uplink/downlink configuration sequence numbers.
Preferably, the MAC CE further includes at least one of: information indicating the predetermined length of time; an identification bit for identifying whether the MAC CE is transmitted for the first time; a UL Grant for indicating the specified location.
Preferably, the designated location comprises at least one of: the terminal performs Hybrid Automatic Repeat Request (HARQ) feedback on the received MAC CE; a location indicated by the UL Grant; and presetting the position of the uplink subframe.
Preferably, the UL Grant indicates the same rule for the specified location as is used for determining the location of the scheduled transmission from the UL Grant in the random access response.
Preferably, the predetermined period of time is determined by at least one of: predetermining the predetermined time period; and determining the preset time length according to the information which indicates the preset time length and is included in the MAC CE.
Preferably, before the terminal performs feedback at the designated location, the method further includes: and the terminal acquires an R domain of the MAC subheader corresponding to the MAC CE, wherein the R domain of the MAC subheader corresponding to the MAC CE is used for identifying whether the MAC CE is transmitted for the first time.
Preferably, before the terminal performs feedback at the designated location, the method further includes: the terminal receives DCI, wherein the DCI comprises the MAC CE contained in the information for identifying the current PDSCH transmission and the identification information indicating whether the TDD configuration information is transmitted for the first time.
Preferably, after the terminal receives the DCI, the method further includes: and under the condition that the DCI marks that the information indicating the TDD configuration is not transmitted for the first time, the terminal does not transmit the received HARQ feedback corresponding to the MAC CE.
Preferably, if the terminal receives the MAC CE for the first time in the current RRC connection, the terminal performs at least one of the following restrictions: the terminal limits the physical layer downlink measurement to a preset downlink subframe for execution; the terminal limits the periodic CQI/PMI/RI/SRS transmission to be executed on a preset uplink subframe; if the sub-frame of SPS downlink transmission is changed into an uplink sub-frame, the terminal skips the SPS downlink transmission reception of the sub-frame, or the terminal receives the SPS downlink transmission at the same downlink assignment DL assignment position of the nearest downlink sub-frame or the nearest preset downlink sub-frame behind the uplink sub-frame; and if the sub-frame of the SPS uplink transmission is changed into a downlink sub-frame, the terminal does not carry out the SPS uplink transmission, or the terminal carries out the SPS uplink transmission at the same UL Grant position of the latest uplink sub-frame or the latest preset uplink sub-frame behind the downlink sub-frame.
Preferably, before the terminal receives the TDD reconfiguration notification MAC CE, the method further includes: the terminal receives first signaling for indicating that the TDD configuration update method is enabled.
Preferably, the first signaling is carried by using MAC CE or RRC signaling.
Preferably, after the terminal receives the TDD reconfiguration notification MAC CE, the method further includes: in case the terminal receives the first signaling, the terminal performs at least one of the following restrictions: the terminal limits the physical layer downlink measurement to a preset downlink subframe for execution; the terminal limits the periodic CQI/PMI/RI/SRS transmission to be executed on a preset uplink subframe; if the sub-frame of the SPS downlink transmission is changed into an uplink sub-frame, the terminal skips the SPS downlink transmission reception of the sub-frame, or the terminal receives the SPS downlink transmission at the same DL assignment position of the nearest downlink sub-frame or the nearest preset downlink sub-frame behind the uplink sub-frame; and if the subframe of the SPS uplink transmission is changed into a downlink subframe, the terminal does not carry out the SPS uplink transmission, or the terminal carries out the SPS uplink transmission at the same ULGrant position of the latest uplink subframe or the latest preset uplink subframe behind the downlink subframe.
Preferably, after the terminal receives the first signaling for indicating the TDD configuration update method is enabled, the method further includes: and when the terminal executes the random access process and receives the RAR, the terminal sends the scheduled transmission according to the TDD uplink/downlink configuration notified in the system message or the RRC reconfiguration message.
Preferably, after the terminal performs at least one of the above restrictions, the method further includes: the terminal cancels the restriction of execution on the condition that the terminal receives a second signaling for indicating the end of TDD configuration update.
Preferably, the second signaling is carried by using MAC CE or RRC signaling.
Preferably, the feedback of the terminal at the designated position includes: the terminal sends HARQ feedback to the MAC PDU at the designated position, wherein the MAC PDU is the received MAC PDU where the MAC CE is located; or, the terminal sends MAC layer signaling for indicating correct reception of the MAC CE to a network side.
Preferably, the predetermined duration is less than a BCCH modification period.
According to another aspect of the present invention, there is provided a TDD configuration updating method, including: a network side sends a TDD reconfiguration notification MAC CE, wherein the MAC CE comprises information indicating TDD configuration; and if the network side receives the feedback that the terminal correctly receives the MAC CE at the designated position, the network side confirms the preset time length after the terminal receives the MAC CE and starts to use the TDD configuration indicated in the MAC CE.
Preferably, in a case that the network side does not receive the feedback that the terminal correctly receives the MAC CE at the specified location, the method further includes: and the network side decides whether to retransmit the MAC CE.
Preferably, the MAC CE including the information indicating the TDD configuration includes: the MAC CE comprises TDD uplink/downlink configuration sequence numbers.
Preferably, the MAC CE further includes at least one of: information indicating the predetermined length of time; an identification bit for identifying whether the MAC CE is transmitted for the first time; a UL Grant for indicating the specified location.
Preferably, the designated location comprises at least one of: the terminal carries out hybrid automatic repeat request HARQ feedback on the received MAC CE; a location indicated by the UL Grant; and presetting the position of the uplink subframe.
Preferably, the UL Grant indicates the same rule for the specified location as is used for determining the location of the scheduled transmission from the UL Grant in the random access response.
Preferably, the predetermined period of time is determined by at least one of: predetermining the predetermined time period; and determining the preset time length according to the information which indicates the preset time length and is included in the MAC CE.
Preferably, the sending, by the network side, the TDD reconfiguration notification MAC CE further includes: and the network side uses the R domain of the MAC subheader corresponding to the MAC CE to identify whether the MAC CE is transmitted for the first time.
Preferably, the sending, by the network side, the TDD reconfiguration notification MAC CE further includes: and the network side transmits DCI, wherein the DCI comprises the MAC CE contained in the information for identifying the current PDSCH transmission and the identification information indicating whether the TDD configuration information is transmitted for the first time.
Preferably, the receiving, by the network side, the feedback that the terminal correctly receives the MAC CE at the specified location includes: the network side receives ACK feedback which is sent by the terminal and receives the MAC CE at the appointed position; and/or the network side receives MAC layer signaling for indicating that the MAC CE is correctly received at the specified position.
Preferably, after the network side transmits the TDD reconfiguration notification MAC CE, the method further includes: and under the condition of executing the random access process, the network side sends RAR and receives scheduled transmission according to TDD uplink/downlink configuration notified by the system message.
The scheduled transmission is less than the BCCH modification period.
According to another aspect of the present invention, there is provided a TDD configuration updating apparatus, located in a terminal, including: a receiving module, configured to receive a TDD reconfiguration notification MAC CE, where the MAC CE includes information indicating TDD configuration; and the execution module is used for feeding back at a specified position and starting to use the TDD configuration indicated in the MAC CE within a preset time after the MAC CE is received.
According to another aspect of the present invention, there is also provided a TDD configuration updating apparatus, located on a network side, including: a sending module, configured to send a TDD reconfiguration notification MAC CE, where the MAC CE includes information indicating TDD configuration; a confirming module, configured to receive, at a specified location, a feedback that a terminal correctly receives the MAC CE, and then the network side confirms a predetermined time after the terminal receives the MAC CE, and starts to use the TDD configuration indicated in the MAC CE.
According to another aspect of the present invention, a TDD configuration updating system is provided, which includes the TDD configuration updating apparatus located at the terminal, and further includes the TDD configuration updating apparatus located at the network side.
By the invention, the terminal is adopted to receive the TDD reconfiguration notification MAC CE, wherein the MAC CE comprises information indicating TDD configuration; the terminal feeds back at the designated position, and starts to use the TDD configuration mode indicated in the MAC CE within the preset time after receiving the MAC CE, so that the problem of untimely update caused by the updating mode of the TDD configuration in the related technology is solved, the updating efficiency of the TDD configuration is improved, and the communication resource utilization rate of the TDD system is improved.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In order to solve the above problem, a method for dynamically changing TDD configuration is needed, which has smaller time granularity and more flexibility than that of TDD configuration change in the existing system, and ensures that the problem that Hybrid Automatic Repeat Request (HARQ) feedback cannot be sent before and after a change boundary due to TDD configuration change is avoided. Certain specific users may be assigned a certain TDD configuration while ensuring that other users are not affected. And the base station (e.g., eNB) has the same understanding as the terminal as to when to start adopting the new TDD uplink/downlink configuration.
Therefore, this embodiment provides a TDD configuration updating method, fig. 2 is a flowchart of the TDD configuration updating method according to the embodiment of the present invention, and as shown in fig. 2, the method includes the following steps:
step S202, the terminal receives a TDD reconfiguration notification MAC CE, wherein the MAC CE contains information indicating TDD configuration;
step S204, the terminal performs feedback at the designated location, and starts to use the TDD configuration indicated in the MAC CE for a predetermined time after receiving the MAC CE.
In this embodiment, through the above steps, the terminal starts to use the TDD configuration indicated in the MAC CE after receiving the predetermined time after the TDD reconfiguration notification MAC CE, compared with a manner that communication can be performed according to the modified TDD configuration after waiting for the next BCCH modification period whenever the TDD configuration is modified in the related art, the time granularity for changing the TDD configuration is smaller and more flexible, the new TDD configuration effective speed is not affected by different times for initiating the TDD configuration modification, and the network side and the terminal have the same understanding on when the new TDD configuration starts to be adopted, which solves the problem in the related art that the updating manner of the TDD configuration causes untimely updating, improves the updating efficiency of the TDD configuration, and improves the communication resource utilization rate of the TDD system.
Preferably, the information indicating the TDD configuration included in the MAC CE may be a TDD uplink/downlink configuration sequence number.
As a preferred embodiment, some other indication information may also be included in the MAC CE, for example: information indicating the predetermined time duration, an identification bit for identifying whether the MAC CE is transmitted for the first time, and an uplink Grant (UL Grant), which may be used to indicate the designated location.
Preferably, the designated position may be a position where the terminal performs HARQ feedback on the received MAC CE (that is, a position where the terminal performs HARQ feedback on a MAC Protocol Data Unit (PDU) where the MAC CE is located), and/or a position indicated by the UL Grant, and/or a position of a preset fixed uplink subframe.
Wherein, if the UL Grant is adopted to indicate the designated position, the rule of the UL Grant indicating the designated position is the same as the rule used for determining the position of the scheduled transmission according to the UL Grant in the random access response. For example, according to the existing protocol, the rule that the UE determines the scheduled transmission (i.e., Msg 3) according to the UL Grant in the random access response is that if the UE receives the random access response at subframe n and contains the UL Grant, the UE sends Msg3 at the first or second available uplink subframe n + k, where k is greater than or equal to 6. In this embodiment, the rule for determining the designated position according to the UL Grant is the same as the rule for determining the Msg3 transmission position according to the UL Grant in the random access response, and specifically may be: if the UE receives the TDD reconfiguration notification MAC CE in the subframe n and the subframe n includes the UL Grant, the UE sends a MAC layer signaling for correctly receiving the TDD reconfiguration notification in the first or second available uplink subframe n + k, where k is greater than or equal to 6, and when the UE determines the first or second available uplink subframe, the UE adopts the TDD uplink/downlink configuration indicated in the TDD reconfiguration notification MAC CE.
Preferably, the predetermined time period may be determined by: the predetermined duration, and/or the predetermined duration is determined based on information included in the MAC CE indicating the predetermined duration.
Preferably, the terminal may determine whether the MAC CE is transmitted for the first time, and the determination method may include the following steps: the method comprises the steps of determining whether the MAC CE is transmitted for the first time according to an identification bit which is included in the MAC CE and used for identifying whether the MAC CE is transmitted for the first time; the terminal acquires an R domain of an MAC subheader corresponding to the MAC CE, wherein the R domain is used for identifying whether the MAC CE is transmitted for the first time; in the third method, the terminal receives Downlink Control Information (DCI), where the DCI includes a MAC CE used to identify Information transmitted on a current Physical Downlink Shared Channel (PDSCH) and identification Information indicating whether TDD configuration Information is first transmitted. If the DCI identifier indicates that the TDD configured information is not first transmitted, the terminal may not transmit a Hybrid Automatic Repeat Request (HARQ) feedback corresponding to the received MAC CE.
In addition, in the network planning process, to avoid interference problem, it is preferable that the neighboring cells in the TDD system use the same TDD uplink/downlink configuration. However, when actually networking, it is sometimes difficult to make TDD uplink/downlink configurations of all cells in a region all the same, which may aggravate inter-cell interference and reduce user experience of cell edge users, if some edge users may be limited to perform scheduling, measurement, and feedback on some specific subframes, it may be ensured that the received inter-cell interference is the minimum, and communication quality of the some users is improved, dynamically changing the serving cell TDD configuration is a convenient scheme for achieving the target, and by coordinating two cells in a short time to become TDD uplink/downlink synchronization, inter-cell interference may be reduced.
Therefore, as a preferred embodiment, if the terminal finds that the MAC CE is received for the first time in a current Radio Resource Control (RRC) connection, the terminal may perform at least one of the following limitations: the terminal limits the physical layer downlink measurement to a preset downlink subframe for execution; the terminal restricts transmission of a periodic Channel Quality Indication (CQI)/Precoding Matrix Indication (PMI)/Rank Indication (RI)/Channel Sounding Reference Signal (SRS) on a preset uplink subframe to be executed; if a subframe of Semi-Persistent Scheduling (SPS) downlink transmission is changed into an uplink subframe, the terminal skips the SPS downlink transmission reception of the subframe, or the terminal receives the SPS downlink transmission at the same DL assignment position of the nearest downlink subframe or the nearest preset downlink subframe after the uplink subframe; and if the sub-frame of the SPS uplink transmission is changed into the downlink sub-frame, the terminal does not perform the SPS uplink transmission, or the terminal performs the SPS uplink transmission at the same UL Grant position of the latest uplink sub-frame or the latest preset uplink sub-frame behind the downlink sub-frame.
Preferably, before the terminal receives the TDD reconfiguration notification MAC CE, the terminal may further receive a first signaling for indicating the TDD configuration updating method to be enabled, and when the terminal receives the first signaling, the terminal may determine that the network side is to send the TDD reconfiguration notification MAC CE, so that the terminal may prepare for receiving the MAC CE and performing TDD configuration change.
The first signaling may be carried by using a MAC CE, Radio Resource Control (RRC) signaling, or the like.
As mentioned above, if some edge users can be limited to perform scheduling, measurement, and feedback on some specific subframes, it can be ensured that the received inter-cell interference is minimum, and the communication quality of the some users is improved. Therefore, when the terminal receives the first signaling, the terminal may also perform at least one of the following restrictions:
the terminal limits the physical layer downlink measurement to a preset downlink subframe for execution; the terminal restricts transmission of a periodic Channel Quality Indication (CQI)/coding Matrix Indication (PMI)/Rank Indication (RI)/Channel Sounding Reference Signal (SRS) on a preset uplink subframe to be executed; if a subframe of Semi-persistent scheduling (SPS) downlink transmission is changed into an uplink subframe, the terminal skips the SPS downlink transmission reception of the subframe, or the terminal receives the SPS downlink transmission at the same downlink assignment (DLassignment) position of the nearest downlink subframe or the nearest preset downlink subframe after the uplink subframe; and if the sub-frame of the SPS uplink transmission is changed into the downlink sub-frame, the terminal does not perform the SPS uplink transmission, or the terminal performs the SPS uplink transmission at the same UL Grant position of the latest uplink sub-frame or the latest preset uplink sub-frame behind the downlink sub-frame.
Preferably, after the terminal receives the first signaling for indicating the TDD configuration update method to be enabled, if the terminal performs a Random Access procedure and the terminal receives a Random Access Response (RAR), the terminal sends the scheduled transmission according to the TDD uplink/downlink configuration notified in the system message or the RRC reconfiguration message.
Preferably, after the terminal performs the restriction, if the terminal receives a second signaling indicating that the TDD configuration update is finished, the restriction may be cancelled.
The second signaling may be carried by using MAC CE or RRC signaling.
Preferably, the terminal may perform feedback at the specified position by: the terminal sends HARQ feedback to a MAC Protocol Data Unit (PDU) at the designated position, wherein the MAC PDU is the received MAC PDU where the MAC CE is located; alternatively, the terminal may send MAC layer signaling indicating correct reception of the MAC CE to the network side.
It should be noted that the predetermined duration is smaller than the modification period n of the broadcast control channel BCCH, and is usually much smaller than the modification period n, for example, the modification period n has a length of at least 640ms, and the predetermined duration is usually tens of ms or several ms.
Corresponding to the TDD configuration updating method, in this embodiment, a TDD configuration updating apparatus is further provided, where the apparatus is located in a terminal, and the apparatus is used to implement the foregoing embodiment and the preferred embodiment, and details of the foregoing description are omitted. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 3 is a block diagram of a TDD configuration updating apparatus according to an embodiment of the present invention, and as shown in fig. 3, the apparatus includes: a receiving module 32 and an executing module 34, each of which is described in detail below.
A receiving module 32, configured to receive a TDD reconfiguration notification MAC CE, where the MAC CE includes information indicating TDD configuration; and the executing module 34 is connected to the receiving module 32, and configured to perform feedback at the specified location, and start to use the TDD configuration indicated in the MAC CE for a predetermined time after receiving the MAC CE.
In this embodiment, through the above modules, after the receiving module 32 receives the predetermined time after the TDD reconfiguration notification MAC CE, the executing module 34 starts to use the TDD configuration indicated in the MAC CE, and compared with a manner that communication can be performed according to the changed TDD configuration by waiting for the next BCCH change period whenever the TDD configuration change is initiated in the related art, the time granularity for changing the TDD configuration is smaller and more flexible, the new TDD configuration effective speed is not affected by different times for initiating the TDD configuration change, and it is convenient for the network side and the terminal to have the same understanding on when the new TDD configuration starts to be adopted, thereby solving the problem that update is not timely caused by the update manner of the TDD configuration in the related art, improving the update efficiency of the TDD configuration, and improving the communication resource utilization rate of the TDD system.
In this embodiment, another TDD configuration updating method is further provided, and fig. 4 is a flowchart of another TDD configuration updating method according to an embodiment of the present invention, as shown in fig. 4, the method includes the following steps:
step S402, the network side sends TDD reconfiguration notification MAC CE, wherein, the MAC CE contains information indicating TDD configuration;
step S404, if the network side receives the feedback that the terminal correctly receives the MAC CE at the designated location, the network side confirms the predetermined time after receiving the MAC CE, and starts to use the TDD configuration indicated in the MAC CE.
In this embodiment, through the above steps, after the network side determines that the terminal starts to use the TDD configuration indicated in the MAC CE after receiving the feedback that the terminal correctly receives the TDD reconfiguration notification MAC CE for a predetermined time period, compared with a manner that the terminal can perform communication according to the changed TDD configuration by waiting for the next BCCH change period whenever the TDD configuration change is initiated in the related art, the time granularity for changing the TDD configuration is smaller and more flexible, the new TDD configuration validation speed is not affected by the difference in the time for initiating the TDD configuration change, and the network side and the terminal have the same understanding on when the new TDD configuration starts to be adopted, which solves the problem in the related art that the update is not timely due to the update manner of the TDD configuration, improves the update efficiency of the TDD configuration, and improves the communication resource utilization rate of the TDD system.
Preferably, if the network side does not receive the feedback that the terminal correctly receives the MAC CE at the designated location, the network side may decide whether to retransmit the MAC CE.
Preferably, the information indicating the TDD configuration included in the MAC CE may be a TDD uplink/downlink configuration sequence number.
As a preferred embodiment, some other indication information may also be included in the MAC CE, for example: information indicating the predetermined time duration, an identification bit for identifying whether the MAC CE is transmitted for the first time, and an uplink Grant (UL Grant), which may be used to indicate the designated location.
Preferably, the designated location may be a location at which the terminal performs HARQ feedback on the received MAC CE, and/or a location indicated by the UL Grant, and/or a location of a preset fixed uplink subframe.
Wherein, if the UL Grant is adopted to indicate the designated position, the rule of the UL Grant indicating the designated position is the same as the rule of the position used for determining the scheduled transmission position according to the UL Grant in the random access response. For example, according to the existing protocol, the rule that the UE determines the scheduled transmission (i.e., Msg 3) according to the UL Grant in the random access response is that if the UE receives the random access response at subframe n and contains the UL Grant, the UE sends Msg3 at the first or second available uplink subframe n + k, where k is greater than or equal to 6. In this embodiment, the rule for determining the designated position according to the UL Grant is the same as the rule for determining the Msg3 transmission position according to the UL Grant in the random access response, and specifically includes: if the UE receives the TDD reconfiguration notification MAC CE in the subframe n and the subframe n includes the UL Grant, the UE sends a MAC layer signaling for correctly receiving the TDD reconfiguration notification in the first or second available uplink subframe n + k, where k is greater than or equal to 6, and when the UE determines the first or second available uplink subframe, the UE adopts the TDD uplink/downlink configuration indicated in the TDD reconfiguration notification MAC CE.
Preferably, the predetermined time period may be determined by: the predetermined duration, and/or the predetermined duration is determined based on information included in the MAC CE indicating the predetermined duration.
Preferably, the network side may indicate whether the MAC CE is first transmitted, and the indication method may include the following steps: the method comprises the steps of indicating whether the MAC CE is transmitted for the first time according to an identification bit which is included in the MAC CE and used for identifying whether the MAC CE is transmitted for the first time; the network side identifies whether the MAC CE is transmitted for the first time in the R domain of the MAC subheader corresponding to the MAC CE; in the third method, the network side sends Downlink Control Information (DCI), where the DCI includes a MAC CE used to identify Information transmitted on a current Physical Downlink Shared Channel (PDSCH) and identification Information indicating whether TDD configuration Information is first sent.
Preferably, the network side may receive the feedback of the terminal at the specified position in the following manner: the network side receives the Acknowledgement Character (ACK) feedback for receiving the MAC CE from the terminal at the designated location, or receives the MAC layer signaling for indicating the correct reception of the MAC CE at the designated location.
Preferably, in the case of performing the random access procedure, the network side performs sending of a Random Access Response (RAR) and receiving of scheduled transmission according to TDD uplink/downlink configuration notified by the system message.
It should be noted that the predetermined duration is smaller than the modification period n of the broadcast control channel BCCH, and is usually much smaller than the modification period n, for example, the modification period n is at least 640ms, and the predetermined duration is usually tens of ms or several ms.
Corresponding to the above another TDD configuration updating method, in this embodiment, another TDD configuration updating apparatus is further provided, located on the network side, and is used to implement the foregoing embodiment and preferred embodiment, which have already been described and are not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 5 is a block diagram of another TDD configuration updating apparatus according to an embodiment of the present invention, and as shown in fig. 5, the apparatus includes: a sending module 52 and an acknowledgement module 54, each of which is described in detail below.
A sending module 52, configured to send a TDD reconfiguration notification MAC CE, where the MAC CE includes information indicating TDD configuration; a confirming module 54, connected to the sending module 52, configured to receive, at a specified location, the feedback that the terminal correctly receives the MAC CE, and then the network side confirms a predetermined time after the terminal receives the MAC CE, and starts to use the TDD configuration indicated in the MAC CE.
In this embodiment, through the above modules, after the network side sends the TDD reconfiguration notification MAC CE through the sending module 52, and the confirmation module 54 confirms that after the predetermined duration after the terminal receives the feedback of correctly receiving the TDD reconfiguration notification MAC CE, the terminal starts to use the TDD configuration indicated in the MAC CE, compared with the manner that communication can be performed according to the changed TDD configuration whenever the change of the TDD configuration is initiated by waiting for the next BCCH change period in the related art, the time granularity for changing the TDD configuration is smaller and more flexible, the new TDD configuration effective speed is not affected by different times for initiating the TDD configuration change, and the network side and the terminal have the same understanding on when to start to adopt the new TDD configuration, the problem that update is not timely due to the update manner of the TDD configuration in the related art is solved, and the update efficiency of the TDD configuration is improved, the utilization rate of communication resources of the TDD system is improved.
In this embodiment, a TDD configuration updating system is further provided, fig. 6 is a block diagram of a structure of the TDD configuration updating system according to an embodiment of the present invention, and as shown in fig. 6, the system includes the TDD configuration updating apparatus located in the terminal 30 as shown in fig. 3, and further includes the TDD configuration updating apparatus located in the network side 50 as shown in fig. 5.
The following description is given in conjunction with the preferred embodiments, which combine the above embodiments and their preferred embodiments.
In the following preferred embodiment, a method of dynamically changing TDD configuration is provided.
Example one
In the preferred embodiment, a method for dynamically changing TDD uplink/downlink configuration is provided, where the method includes:
receiving a TDD reconfiguration notification Media Access Control (MAC) Control Element (CE);
if the decoding is correct, the feedback is performed at the designated position, and the TDD reconfiguration indicated in the MACCE is notified by using the TDD reconfiguration at the preset time.
The TDD reconfiguration notification MAC CE includes a TDD uplink/downlink configuration sequence number or a combination of the TDD uplink/downlink configuration sequence number and any one or more of the following:
receiving a time length from the TDD reconfiguration notification MAC CE to the TDD configuration indicated by the TDD reconfiguration notification MAC CE;
an identification bit for identifying whether the MAC CE is transmitted for the first time;
and an uplink Grant (UL Grant) for transmitting the feedback that the TDD reconfiguration is correctly received.
Preferably, the R field of the MAC subheader corresponding to the TDD reconfiguration notification MAC CE is used to identify whether the TDD reconfiguration notification MAC CE is transmitted for the first time.
Preferably, the Information transmitted on the current PDSCH is identified by Downlink Control Information (DCI) to include the TDD reconfiguration notification MAC CE and whether the TDD reconfiguration Information is transmitted for the first time.
Optionally, the DCI identifies that the TDD reconfiguration information is not first transmitted, and the UE does not transmit HARQ feedback of the MAC PDU received by the subframe.
The specified position is specifically a position for receiving HARQ feedback of a subframe where the TDD reconfiguration notification MAC CE is located, and/or a position determined according to an UL Grant in the TDD reconfiguration notification MAC CE, and/or a position of a preset fixed uplink subframe.
The rule of the position determined by the UL Grant in the MAC CE according to the TDD reconfiguration notification is the same as the rule of the position determined by the UL Grant in the random access response.
The feeding back is specifically to receive HARQ feedback of the MAC PDU where the TDD reconfiguration notification MAC CE is located, or to indicate that a new MAC layer signaling of the TDD reconfiguration notification MAC CE is correctly received.
The predetermined time is determined by a protocol or according to the time length notified in the TDD reconfiguration notification MAC CE.
Optionally, before the UE receives the TDD reconfiguration notification MAC CE, the UE receives a signaling for indicating the dynamic TDD configuration enablement.
The signaling for indicating the dynamic TDD configuration enablement is carried using MAC CE or RRC signaling.
Preferably, the UE receives the TDD reconfiguration notification MAC CE for the first time in a current Radio Resource Control (RRC) connection, or when the UE receives a signaling indicating dynamic TDD configuration enabling, it is limited that the physical layer downlink measurement can only be performed on a fixed downlink subframe.
Preferably, the UE receives the TDD reconfiguration notification MAC CE for the first time in a current Radio Resource Control (RRC) connection, or when the UE receives a signaling indicating dynamic TDD configuration enabling, the UE restricts that the periodic CQI/PMI/RI/SRS transmission can only be performed on a fixed uplink subframe.
Preferably, the UE receives the TDD reconfiguration notification MAC CE for the first time in a current Radio Resource Control (RRC) connection, or receives a signaling indicating dynamic TDD configuration enabling, and receives or skips SPS downlink transmission reception of a subframe at the same DL assignment position of a nearest downlink subframe or a nearest fixed downlink subframe after the uplink subframe if a subframe of semi-persistent scheduling (SPS) downlink transmission is changed to the uplink subframe.
Preferably, the UE receives the TDD reconfiguration notification MAC CE for the first time in a current Radio Resource Control (RRC) connection, or after receiving a signaling indicating dynamic TDD configuration enabling, if a subframe of semi-persistent scheduling (SPS) uplink transmission is changed into a downlink subframe, does not transmit or transmits at the same UL Grant position of a nearest uplink subframe or a nearest fixed uplink subframe after the downlink subframe.
Optionally, when receiving the signaling for indicating the end of the dynamic TDD configuration, the UE cancels the restriction on downlink measurement, SPS scheduling reception and transmission, and periodic CQI/PMI/RI/SRS reporting.
Preferably, the signaling indicating the end of the dynamic TDD configuration is carried by using MAC CE or RRC signaling.
In the preferred embodiment, a method for dynamically changing TDD uplink/downlink configuration is further provided, where the method includes:
the network side sends TDD reconfiguration notice MAC CE;
the network side executes different steps according to whether the TDD reconfiguration notification MAC CE is received correctly at the appointed position.
The different steps executed by the network side according to whether the feedback that the TDD reconfiguration notification MAC CE is correctly received is received at the designated location specifically include:
if the feedback that the TDD reconfiguration notification MAC CE is correctly received is received at the designated position, the UE which performs feedback after the preset time is considered to start to use the TDD configuration indicated in the TDD reconfiguration notification MAC CE;
if the feedback that the TDD reconfiguration notification MAC CE is correctly received is not received at the designated position, the network side determines whether to retransmit the TDD reconfiguration notification MAC CE.
The TDD reconfiguration notification MAC CE includes a TDD uplink/downlink configuration sequence number or a combination of the TDD uplink/downlink configuration sequence number and any one or more of the following:
the UE receives a time length from the TDD reconfiguration notification MAC CE to the beginning of using the TDD configuration indicated in the TDD reconfiguration notification MAC CE;
an identification bit for identifying whether the TDD reconfiguration notification MAC CE is first transmitted;
and an UL Grant for transmitting feedback information that the TDD reconfiguration information is correctly received.
Optionally, the R domain of the MAC subheader corresponding to the TDD reconfiguration notification MAC CE is used to identify whether the TDD reconfiguration notification MAC CE is first transmitted.
Preferably, the information for identifying the current PDSCH transmission includes the TDD reconfiguration notification and whether the TDD reconfiguration notification MAC CE is first transmitted through the DCI.
The predetermined time is specified by a protocol or specified by the TDD reconfiguration notification MAC CE.
The specified position is specifically a position of HARQ feedback of a subframe where the network side transmits the TDD reconfiguration notification MAC CE, or a position determined according to the UL Grant in the TDD reconfiguration notification MAC CE.
The rule of the position determined by the UL Grant in the MAC CE according to the TDD reconfiguration notification is the same as the rule of the position determined by the UL Grant in the random access response.
The feedback is specifically HARQ feedback for the UE to correctly receive the MAC PDU where the TDD reconfiguration MAC CE is located, or new MAC layer signaling for indicating that the UE correctly receives the TDD reconfiguration.
Preferably, when the random access procedure is executed, after receiving a random access Response (randomaccess Response), the UE sends the Msg3 according to the TDD uplink/downlink configuration notified in the system message or the RRC reconfiguration message.
Preferably, when the random access procedure is executed, the network side sends the RAR and receives the Msg3 according to the TDD uplink/downlink configuration notified by the system message.
Example two
Fig. 7 is a flowchart of a method for dynamically changing TDD uplink/downlink configuration according to a second embodiment of the present invention, as shown in fig. 7, the method includes the following steps:
step S702: the network side (e.g., eNB) sends a TDD reconfiguration notification MAC CE to the UE.
The TDD reconfiguration notification MAC CE includes a TDD uplink/downlink configuration sequence number or a combination of the TDD uplink/downlink configuration sequence number and any one or more of the following: the UE receives a time length from the TDD reconfiguration notification MAC CE to the beginning of using the TDD configuration indicated in the TDD reconfiguration notification MAC CE; an identification bit for identifying whether the TDD reconfiguration notification MAC CE is first transmitted; and an UL Grant for transmitting feedback information that the TDD reconfiguration information is correctly received.
Optionally, the R domain of the MAC subheader corresponding to the TDD reconfiguration notification MAC CE is used to identify whether the TDD reconfiguration notification MAC CE is first transmitted. Preferably, the information for identifying the current PDSCH transmission includes the TDD reconfiguration notification and whether the TDD reconfiguration notification MAC CE is first transmitted through the DCI.
It should be noted that, in this patent scope, the first sending of the TDD reconfiguration notification MAC CE indicates that the TDD configuration indicated by the TDD reconfiguration notification MAC CE sent to the UE last time is different from the TDD configuration indicated by the TDD reconfiguration notification MAC CE sent last time, or the TDD reconfiguration notification MAC CE is sent to the UE first time in the current RRC connection; the TDD reconfiguration notification MAC CE indicates that the TDD reconfiguration indicated by the TDD reconfiguration notification MAC CE is the same as the TDD configuration indicated by the TDD reconfiguration notification MAC CE that was last transmitted, and/or that a user is using the TDD uplink/downlink configuration indicated in the TDD reconfiguration notification MAC CE already within the service range of the base station.
Step S704: the UE receives a TDD reconfiguration notification MAC CE.
The contents of the TDD reconfiguration notification MAC CE are the same as in step S702.
Step S706: the UE judges whether the TDD reconfiguration notification is decoded correctly or not.
The UE determines whether the TDD reconfiguration notification is decoded correctly, if so, proceeds to step S708, otherwise, proceeds to step S714.
Step S708: and the UE feeds back the TDD reconfiguration notification MAC CE which is correctly received at the appointed position.
The designated position may be a position for receiving HARQ feedback of a subframe where the TDD reconfiguration notification MAC CE is located, and/or a position determined according to an UL Grant in the TDD reconfiguration notification MAC CE, and/or a position of a preset fixed uplink subframe. The rule of the position determined by the UL Grant in the MAC CE according to the TDD reconfiguration notification is the same as the rule of the position determined by the UL Grant in the random access response. The feeding back is specifically to receive HARQ feedback of the MAC PDU where the TDD reconfiguration notification MAC CE is located, or to indicate that a new MAC layer signaling of the TDD reconfiguration notification MAC CE is correctly received. The position of the fixed uplink subframe may be one of the last OFDM symbol of the UpPTS of the 1# subframe and the 2# subframe. When the DCI information on the PDCCH identifies that the TDD reconfiguration information transmitted on the PDSCH is not first transmitted, optionally, the UE does not transmit HARQ feedback of the MAC PDU received by the subframe.
It can be specified in the protocol that the UE needs to perform HARQ feedback on the first-transmitted TDD reconfiguration notification, and the UE does not need to feed back a new MAC layer signaling to the first-transmitted TDD reconfiguration notification.
It may be specified in the protocol that the UE needs to feed back a new MAC layer signaling to the TDD reconfiguration notification that is not the first transmission, and the UE may not perform HARQ feedback on the TDD reconfiguration notification that is the first transmission.
Step S710: and whether the network side receives the feedback correctly received by the UE at the specified position.
The network side determines whether the feedback correctly received by the UE is received at the designated location, if yes, the process goes to step S712, and if no, the process goes to step S714.
The specified position may be a position of HARQ feedback of a subframe where the network side transmits the TDD reconfiguration notification MAC CE, and/or a position determined according to an UL Grant in the TDD reconfiguration notification MAC CE, and/or a position of a preset fixed uplink subframe. The rule of the position determined by the UL Grant in the MAC CE according to the TDD reconfiguration notification is the same as the rule of the position determined by the UL Grant in the random access response. The feedback is specifically HARQ feedback for the UE to correctly receive the MAC PDU where the TDD reconfiguration MAC CE is located, or new MAC layer signaling for indicating that the UE correctly receives the TDD reconfiguration.
Step S712: the UE starts to use the TDD configuration indicated in the TDD reconfiguration notification MAC CE at a predetermined time, and the network considers that the UE starts to use the TDD configuration indicated in the TDD reconfiguration notification at the predetermined time.
The predetermined time may be defined by a protocol or determined according to a time length notified in the TDD reconfiguration notification MAC CE.
Step S714: the network determines whether to retransmit the TDD reconfiguration notification to the UE, and if so, proceeds to step S702.
The reason why the network side does not receive the feedback that the TDD reconfiguration notification MAC CE is correctly received may be that the UE does not correctly decode the TDD reconfiguration notification MAC CE, or that the feedback that the TDD reconfiguration notification MAC CE is correctly received may not be received by the network side due to interference or the like. At this time, the network side needs to decide whether to send the TDD reconfiguration notification to the UE again, the network side may set a counter, the counter is incremented by one each time the TDD reconfiguration notification MAC CE is sent to the UE once, and if the maximum number of times of sending is reached, the network side may no longer send the TDD reconfiguration notification to the UE at this time, and wait for sending a new TDD reconfiguration notification to the UE when the TDD uplink/downlink configuration is changed next time. Optionally, a signaling for indicating the end of the dynamic TDD configuration may also be sent to the UE, so that the UE may fall back to the conventional UE state, and perform transmission and reception according to the TDD uplink/downlink configuration notified by the system message. The network side may not maintain the timer, and considers that there is a long time from the current time point of the next TDD uplink/downlink configuration change according to an internal algorithm, and/or if it is still beneficial to the cell throughput to resend the TDD reconfiguration notification, the network side may resend the TDD reconfiguration notification to the UE. If the retransmission is determined, go to step S702; if it is determined not to retransmit, the flow ends.
EXAMPLE III
When the network side considers that the current TDD configuration is not suitable for the uplink and downlink proportion of the current traffic, or because the adjacent cell can seriously interfere with a subframe, because the subframe can seriously interfere with the adjacent cell and the like, the TDD uplink/downlink configuration of the cell needs to be adjusted according to the internal algorithm, and at the moment, the network side can send a TDD reconfiguration notice to some UE in an RRC connection state for adjusting the TDD uplink/downlink configuration used by the UE, thereby improving the resource utilization rate.
Fig. 8 is a first preferred flowchart of a method for dynamically changing TDD uplink/downlink configuration according to a third embodiment of the present invention, as shown in fig. 8, the method includes the following steps:
step S802: and the network side sends the TDD reconfiguration notification to the UE in the RRC connection state for the first time.
When the network side first sends the TDD reconfiguration notification MAC CE, if both the UE and the network side use TDD uplink/downlink configuration a, and the TDD reconfiguration notification MAC CE indicates TDD uplink/downlink configuration B, a is different from B. Two cases are included: firstly, the network side does not use the function of dynamic TDD configuration before, A is TDD uplink/downlink configuration notified in a system message, and at this time, the network side considers that the function of dynamic TDD configuration should be started and transmits a TDD reconfiguration notification to the UE which is in an RRC connection state and supports the function of dynamic TDD configuration for the first time; and secondly, the network side sends a TDD reconfiguration notice before, the dynamic TDD configuration function is enabled, A is the TDD uplink/downlink configuration indicated in the last TDD reconfiguration notice, the current network side finds that the TDD uplink/downlink configuration needs to be changed, and the TDD reconfiguration notice with the indicated configuration B is sent to the UE for the first time. Both cases belong to the range in which the network side first sends the TDD reconfiguration notification to the UE in the RRC connected state.
The TDD reconfiguration notification MAC CE includes a TDD uplink/downlink configuration sequence number, or includes a combination of the TDD uplink/downlink configuration sequence number and one or more of the following: the UE receives a time length from the TDD reconfiguration notification MAC CE to the beginning of using the TDD configuration indicated in the TDD reconfiguration notification MAC CE; an identification bit for identifying whether the TDD reconfiguration notification MAC CE is first transmitted; and an UL Grant for transmitting feedback information that the TDD reconfiguration information is correctly received. Fig. 9(a) to (d) are schematic diagrams of four TDD reconfiguration notification MAC CEs formats according to a third embodiment of the present invention, as shown in fig. 9(a) to (d), wherein TDD config represents a TDD configuration sequence number, occupies 3 bit positions, and respectively represents 7 different TDD uplink/downlink configurations by using three-bit binary numbers; the Timer represents the time length between the receiving of the MAC CE and the beginning of using the TDD configuration indicated by the MAC CE, occupies the position of 4 bits, and represents the time length of 0-15 ms by using a four-bit binary number; n represents an identification bit for identifying whether the MAC CE is first transmitted, occupies a position of 1 bit, is set to 1 or 0 if first transmitted, and is set to 0 or 1 if not correspondingly first transmitted; the ULGrant is an uplink grant which is allocated to the UE by the network side for transmitting the feedback that the TDD reconfiguration information is correctly received, and occupies a position of 20 bits. Fig. 9(a) to (d) only show examples of 4 TDD reconfiguration notification MAC CEs, other combinations are not listed in sequence, and each domain may be combined according to the content of the TDD reconfiguration notification MAC CE, it should be noted that the MAC CE must be in a byte aligned format, and the deficiency may be complemented by R (reserved bit). The positions of the domains in each figure in the same MAC CE are not limited to the schematic diagrams given herein, and the positions may be interchanged, and the number of occupied bits may also be changed.
Fig. 10 is a schematic diagram of a format of a MAC subheader corresponding to a TDD reconfiguration notification MAC CE in a MAC PDU according to a third embodiment of the present invention, as shown in fig. 10, wherein an LCID field of the MAC subheader (sub-header) is identified by one of binary numbers 01011-11010, and a bit in an R field of the MAC subheader may be used to identify whether the TDD reconfiguration notification is sent for the first time. The R field has two bits in total, and any one of the bits may be used. If there is an identification bit N in the MAC subheader to identify whether the TDD reconfiguration notification is first transmitted, the MAC CE may not include the identification bit N. Preferably, the information transmitted on the PDSCH may be identified by DCI information on the PDCCH, including the TDD reconfiguration notification and whether the TDD reconfiguration notification MAC CE is transmitted for the first time. In this step, the network side may carry the TDD reconfiguration notification transmitted on the PDSCH in the DCI information, which is the content sent for the first time. Here, it is also understood that whether HARQ feedback is required or not is carried by using DCI information on a PDCCH, and if the HARQ feedback is required, an identifier that the HARQ feedback is required is carried in the DCI information.
In this step, the network side may use any one of three manners, i.e., a TDD reconfiguration notification MAC CE, a subheader corresponding to the MAC CE, or DCI information on the PDCCH to indicate that the transmitted TDD reconfiguration notification is the first transmission.
Step S804: and the UE receives the TDD reconfiguration notice transmitted for the first time, feeds back the reconfiguration notice according to a decoding result, and starts to use new TDD uplink/downlink configuration after preset time if the decoding is correct.
The UE receives the TDD reconfiguration notification, where the TDD reconfiguration notification is transmitted for the first time in this step, but the UE does not know that the TDD reconfiguration notification can be determined only by correct decoding.
If the UE does not decode the PDSCH correctly, the UE may transmit NACK at the HARQ feedback position, and if the UE does not decode the PDCCH correctly, the UE may not transmit HARQ feedback to the network side, and under both conditions, the network side may not receive the correctly received feedback of the first TDD reconfiguration notification.
If the UE decodes correctly, it will know that the TDD reconfiguration notification is the first transmission, and no matter whether the network side uses any of the three methods for identifying whether the identifier is the first transmission, HARQ feedback is required for the TDD reconfiguration notification of the first transmission.
And the UE starts to use TDD uplink/downlink configuration indicated in the TDD reconfiguration notification after preset time, wherein the preset time is determined by protocol regulation or according to the time length notified in the TDD reconfiguration notification MAC CE. The protocol specification may be a value specified in the protocol, or may utilize a hybrid automatic repeat request round trip delay Timer (HARQ RTT Timer) in Discontinuous Reception (DRX) in existing protocols: and starting the HARQ RTT Timer when the UE receives the MAC CE, and if the UE correctly decodes the MAC CE, starting the UE to use the TDD configuration notified in the MAC CE when the HARQ RTT Timer times out.
The new TDD uplink/downlink configuration is the TDD uplink/downlink configuration indicated in the TDD reconfiguration notification.
Step S806: if the network side receives ACK feedback at the appointed position, the UE is normally scheduled according to the new TDD uplink/downlink configuration after the preset time; and if the network side does not receive the ACK feedback, determining whether to retransmit.
The network side does not receive the ACK feedback for two reasons, one is that the UE does not correctly decode the TDD reconfiguration information, and the other is that the ACK feedback causes the network to be incorrectly received as NACK due to channel interference and other problems in the transmission process. For both cases, the network side cannot confirm whether the UE correctly receives the TDD reconfiguration information. According to the counter method or other internal algorithms, if the network side decides to retransmit the TDD reconfiguration notification to the UE, it shall retransmit to the UE as soon as possible. Considering that other UEs have received correctly and start to use the new TDD configuration, the network side needs to consider which subframes the UE that does not receive correctly will monitor the PDCCH channel, and retransmit the TDD reconfiguration notification to the UE as early as possible. If the complexity is reduced, the retransmission on the network side can be restricted from occurring on a fixed downlink subframe, which is the position of the first several Orthogonal Frequency Division Multiplexing (OFDM) symbols of the DwPTS of 0# subframe/5 # subframe/1 # subframe/the position of the first several OFDM symbols of the DwPTS of 6# subframe.
When retransmitting, the network side needs to use any one of the three methods of whether the identifier is the first transmission or not to inform the UE that the TDD reconfiguration notification of the current transmission is not the first transmission. Preferably, when retransmitting, the network side uses the DCI information to identify that the TDD reconfiguration notification is not transmitted for the first time. Preferably, during the retransmission, the TDD reconfiguration informs the MAC CE that the UL Grant needs to be included, so that the UE can transmit the feedback information using the resource given by the UL Grant after correctly receiving the feedback information.
Step S808: and the UE receives the retransmitted TDD reconfiguration notice, and if the TDD reconfiguration notice is correctly received, the UE feeds back the TDD reconfiguration notice at the specified position.
And the UE receives the retransmitted TDD reconfiguration information, and if the retransmission TDD reconfiguration information is correctly decoded, the UE transmits a new MAC layer signaling according to the resources in the UL Grant to indicate that the UE successfully decodes the TDD reconfiguration notification no matter whether the retransmitted TDD reconfiguration information is received before. And if the UE finds that the DCI information contains an identifier for identifying that the TDD reconfiguration information is not transmitted for the first time when the PDCCH is decoded, the UE does not transmit the HARQ feedback of the received MAC PDU. And the UE immediately starts to use the TDD uplink/downlink configuration indicated in the TDD reconfiguration notification after successfully decoding the retransmitted TDD reconfiguration notification. After receiving the feedback that the retransmitted TDD reconfiguration notification is successfully received, the network side may also use the TDD uplink/downlink configuration indicated in the TDD reconfiguration notification to normally schedule the UE.
Example four
Fig. 11 is a schematic diagram of a contention-based Random Access procedure in an LTE system according to a fourth embodiment of the present invention, where, as shown in fig. 11, in a first step, a UE needs to send a Random Access Preamble (Random Access Preamble) to an eNB, and after receiving the Random Access Preamble, the eNB sends a Random Access Response (RAR) message to the UE. The UE will start monitoring the PDCCH channel 3 subframes after sending the random access preamble. If the UE successfully receives the RAR message in the subframe n corresponding to its Preamble sequence, the UE transmits Msg3 in the first or second UL subframe after 6 subframes, where Msg3 is the Scheduled Transmission in the third step in fig. 11.
If the network side has enabled the dynamic TDD function when the UE performs the random access procedure, the TDD uplink/downlink configuration used by other UEs supporting the dynamic TDD function that are already in the RRC connected state in the current cell is different from the UE performing the random access procedure. Specifically, after receiving the Random access Response (Random access Response), the UE sends Msg3 according to the TDD uplink/downlink configuration notified in the system message or the RRC reconfiguration message; and the network side sends RAR and receives Msg3 according to the TDD uplink/downlink configuration notified by the system message.
EXAMPLE five
Fig. 12 is a second preferred flowchart of a method for dynamically changing TDD uplink/downlink configuration according to a fifth embodiment of the present invention, as shown in fig. 12, the method includes the following steps:
step S1202: the UE receives signaling indicating dynamic TDD configuration enabled or the UE receives a TDD reconfiguration notification for the first time in the current RRC connection.
The signaling for indicating the dynamic TDD configuration capability may be carried using MAC CE or RRC signaling. For example, an information element indicating the dynamic TDD configuration is added to an RRC connection setup message (RRCConnectionSetup) and/or an RRC connection reconfiguration message (RRCConnectionReconfiguration) for notifying the UE to start performing the dynamic TDD configuration. Or a MAC CE may be designed to carry the signaling indicating the dynamic TDD configuration enablement.
Step S1204: and limiting the downlink physical layer measurement of the UE, the receiving and transmission of SPS scheduling and the reporting of the periodic CQI/PMI/RI/SRS to be executed only on a fixed subframe.
In the dynamic TDD configuration, because signaling may be lost or detected incorrectly, the current TDD configuration understood by the UE may be different from that understood by other UEs and that the network side desires the UE to use, so the UE may consider a certain uplink subframe as a downlink subframe and perform measurement, thereby affecting the measurement result of the UE.
Therefore, in order to reduce the influence caused by these abnormal phenomena, after the UE receives the TDD reconfiguration notification for the first time in the current RRC connection or receives the signaling indicating the dynamic TDD configuration enabling, the UE is limited to perform downlink measurement only on the fixed downlink subframe, where the fixed downlink subframe is the 0# subframe, the 5# subframe, and the first few Orthogonal Frequency Division Multiplexing (OFDM) symbols where the DwPTS of the 1# subframe is located and the first few OFDM symbols where the DwPTS of the 6# subframe is located; and/or limiting the UE to perform periodic CQI/PMI/RI/SRS reporting only on a fixed uplink subframe, wherein the fixed uplink subframe is a plurality of last OFDM symbols and a 2# subframe of a UpPTS of a 1# subframe; and/or limiting that if a subframe of semi-persistent scheduling (SPS) downlink transmission is changed into an uplink subframe, the UE receives or skips SPS downlink transmission reception of the subframe at the same DL assignment position of a nearest downlink subframe or a nearest fixed downlink subframe after the uplink subframe; and/or limiting the position of the subframe of the UE not to be transmitted or to be transmitted at the same UL Grant position of the nearest uplink subframe or the nearest fixed uplink subframe after the downlink subframe if the subframe of the semi-persistent scheduling (SPS) uplink transmission is changed into the downlink subframe.
Step S1206: the UE receives a signaling for indicating the end of the dynamic TDD configuration, cancels the limitation of downlink measurement, SPS scheduling reception and transmission and periodic CQI/PMI/RI/SRS reporting, and uses the TDD uplink/downlink configuration notified in the broadcast message.
The signaling indicating the end of the dynamic TDD configuration may be carried by using MAC CE or RRC signaling. Such as RRC connection reconfiguration signaling and/or RRC connection release signaling (RRCConnectionRelease). When receiving the signaling indicating the end of the dynamic TDD configuration, the UE cancels the limitation of downlink measurement, SPS scheduling reception and transmission, and periodic CQI/PMI/RI/SRS reporting in step S802.
In another embodiment, a software is provided, which is used to execute the technical solutions described in the above embodiments and the preferred embodiments.
In another embodiment, a storage medium is provided, wherein the software is stored in the storage medium, and the storage medium includes, but is not limited to, an optical disc, a floppy disc, a hard disc, a rewritable memory, and the like.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.