Method and apparatus for multiple transmit receive point transmissions

Abstract

The invention discloses a method and a device for transmission of a multi-transmission receiving point (multi-TRP), and the method and the device are used for the transmission of the multi-transmission receiving point (multi-TRP). In one embodiment, a method performed by a user equipment (UE) includes receiving, by the UE, a timing advance (TA) command from at least one of a first TRP and a second TRP, the command including a first TA value and a second TA value; updating, by the UE, the first TA value and the second TA value individually or simultaneously; and / or according to the determination of the different TRP or the determination of the UE, processing or avoiding the overlapping of the uplink signals sent by the UE to the different TRP in the time domain.

Description

Technical Field

[0001] The present application relates to the field of wireless communication systems, and more specifically, to methods and apparatus for multiple-transmission reception point (multi-TRP) transmissions, such as wireless communication systems operating in multiple-input multiple-output (MIMO) systems. More specifically, the purpose of the present application is to provide some solutions for updating two timing advance (TA) values ​​and avoiding overlap of uplink (UL) transmissions in multi-TRP scenarios. Background Art

[0002] MIMO is an effective method to enhance the capacity of wireless links by multiplexing transmit and receive antennas. MIMO is a practical technology for simultaneously sending and receiving multiple data signals on the same wireless channel, which greatly improves the performance of spectrum efficiency. Some progress has been made to enable efficient use of multi-TRP transmission, which is also one of the key technologies of MIMO.

[0003] In a multi-TRP scenario, user equipment (UE) can receive downlink (DL) signals from different TRPs or send uplink (UL) signals to different TRPs. However, due to the different distances between the UE and different TRPs, the time at which different TRPs receive UL signals is different. In the current specification, even with multiple TRPs, each UE still maintains only one timing advance (TA) value. Maintaining only one TA value means that the advance times of different UL signals sent by the UE to different TRPs are the same. Sending UL signals with the same advance time may degrade the performance of the UL signal because its orthogonality is reduced compared to the UL signals sent by other UEs. Summary of the invention

[0004] The purpose of the present application is to propose a method and apparatus for multiple-transmission reception point (multi-TRP) transmission.

[0005] In a first aspect of the present application, a method for multi-TRP transmission performed by a user equipment (UE) includes: receiving, by the UE, a timing advance (TA) command from at least one of a first TRP and a second TRP, wherein the TA command includes a first TA value and a second TA value; updating, by the UE, the first TA value and the second TA value individually or simultaneously; and / or processing or avoiding overlap in the time domain of uplink signals transmitted by the UE to different TRPs based on determinations of different TRPs or the UE.

[0006] In a second aspect of the present application, a method for multi-TRP transmission performed by a network includes: controlling the UE to receive a TA command including a first TA value and a second TA value, the TA command coming from at least one of a first TRP and a second TRP; controlling the UE to update the first TA value and the second TA value separately or simultaneously; and / or controlling the UE to process or avoid overlap in the time domain of uplink signals transmitted to different TRPs according to the determination of different TRPs or the determination of the UE.

[0007] In a third aspect of the present application, a user equipment (UE) includes a memory, a transceiver, and a processor connected to the memory and the transceiver. The processor is configured to execute the above method.

[0008] In a fourth aspect of the present application, a network includes a memory, a transceiver, and a processor connected to the memory and the transceiver. The processor is configured to execute the above method.

[0009] In a fifth aspect of the present application, a non-transitory machine-readable storage medium stores instructions thereon, and when a computer executes the instructions, the instructions cause the computer to execute the above method.

[0010] In a sixth aspect of the present application, a chip includes a processor configured to call and run a computer program stored in a memory so that a device equipped with the chip executes the above method.

[0011] In a seventh aspect of the present application, a computer-readable storage medium stores a computer program, wherein the computer program enables a computer to execute the above method.

[0012] In an eighth aspect of the present application, a computer program product comprises a computer program, wherein the computer program enables a computer to execute the above method.

[0013] In a ninth aspect of the present application, a computer program is provided, wherein the computer program enables a computer to execute the above method. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or related technologies, the following briefly introduces the drawings to be described in the embodiments. Obviously, the drawings are only some embodiments of the present application, and ordinary technicians in this field can obtain other drawings based on these drawings without paying any price.

[0015] Figure 1 It is a schematic diagram of the multi-TRP transmission operation according to an embodiment of the present application.

[0016] Figure 2 It is a block diagram of one or more user equipment (UE) and a base station (e.g., gNB) in a communication network system according to an embodiment of the present application.

[0017] Figure 3 It is a flowchart of a multi-TRP transmission method performed by a UE according to an embodiment of the present application.

[0018] Figure 4 It is a flowchart of a multi-TRP transmission method performed by a base station according to an embodiment of the present application.

[0019] Figure 5 It is a schematic diagram of separately updating TA1 and TA2 according to an embodiment of the present application.

[0020] Figure 6 It is a schematic diagram of simultaneously updating TA1 and TA2 according to an embodiment of the present application.

[0021] Figure 7 This is an example schematic diagram of the MAC CE content according to an embodiment of the present application.

[0022] Figure 8 This is another example schematic diagram of the MAC CE content according to an embodiment of the present application.

[0023] Fig. 9 This is a schematic diagram of the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application.

[0024] Fig.10 This is another schematic diagram of the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application.

[0025] Fig.11 This is a schematic diagram of the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application.

[0026] Fig.12This is a schematic diagram of the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application.

[0027] Fig.13 This is a schematic diagram of the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application.

[0028] Fig.14 This is a schematic diagram of the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application.

[0029] Fig.15 This is an example schematic diagram of an indication signaling report according to an embodiment of the present application.

[0030] Fig.16 is a block diagram of a wireless communication system according to an embodiment of the present application. DETAILED DESCRIPTION

[0031] The following is a detailed description of the technical content, structural features, objectives and effects of the present application in conjunction with the accompanying drawings. Specifically, the terms in the embodiments of the present application are only used to describe the purpose of specific embodiments, and are not intended to limit the present application.

[0032] Multiple-input multiple-output (MIMO) is one of the key technologies in new radio (NR) systems and has been successfully commercialized. In MIMO communication systems, both user equipment (UE) and base stations contain a large number of antenna units. Especially for base stations, these antenna units can be distributed on different panels, such as Figure 1 shown. Figure 1 It is described that in multiple-transmission reception point (multi-TRP) transmission operation, each panel is placed in a different position so that the base station can better communicate with the UE. Specifically, in the current specification, the panels in different positions are referred to as multi-TRP. By exploiting spatial diversity, multi-TRP transmission can benefit downlink (DL) and uplink (UL) channels, thereby improving the throughput and reliability of transmission in the event of unpredictable blocking between TRP and UE, especially in frequency range 2 (FR2).

[0033] In the work-item description (WID) of Release 18, two timing advanced (TA) values ​​are introduced in the multi-TRP scenario. The two TA values ​​allow the UE to send different UL signals to different TRPs with different advance times, thereby ensuring the performance of the UL signal. However, the two TA values ​​also bring some problems. The first problem is how to update and distinguish the two TA values. The second problem is UL transmission overlap.

[0034] The main idea of ​​some embodiments of the present application is to provide a solution for updating two TA values ​​and avoiding UL transmission overlap. In order to update the two TA values, separate update and simultaneous update methods are proposed. In order to indicate two TA values, an exemplary method for enhancing the traditional MAC CE is proposed. In order to distinguish the two TA values ​​in the enhanced MAC CE, explicit and implicit methods are proposed. In order to avoid UL transmission overlap, an exemplary method for reasonably allocating resources for TRP in the time domain is proposed. In addition, in order to avoid UL transmission overlap, a UE discarding and fallback method is also proposed. Indication signaling report is proposed to let TRP know about overlapping events.

[0035] Figure 2 It is described that in some embodiments, according to one embodiment of the present application, a communication network system 40 of one or more user equipment (UE) 10 and a base station (e.g., gNB) 20 (or referred to as a network). The communication network system 40 includes one or more UEs 10 and base stations 20. One or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 connected to the memory 12 and the transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 connected to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement the functions, processes, and / or methods described herein. The layers of the wireless interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled to the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled to the processor 11 or 21, and the transceiver 13 or 23 is responsible for sending and / or receiving wireless signals.

[0036] The processor 11 or 21 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits and / or data processing devices. The memory 12 or 22 may include a read-only memory (ROM), a random access memory (RAM), a flash memory, a memory card, a storage medium and / or other storage devices. The transceiver 13 or 23 may include a baseband circuit for processing radio frequency signals. When the embodiment is implemented in software, the techniques described herein may be implemented by modules (e.g., procedures, functions, etc.) that perform the functions described herein. These modules may be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 may be implemented inside the processor 11 or 21, or outside the processor 11 or 21, in which case it may be communicatively coupled to the processor 11 or 21 in various known ways.

[0037] In some embodiments, the transceiver 13 is configured to receive a timing advance (TA) command from at least one of a first TRP and a second TRP, the TA command including a first TA value and a second TA value; the processor 11 is configured to update the first TA value and the second TA value individually or simultaneously; and / or the processor 11 is configured to process or avoid overlap in the time domain of uplink signals sent by the transceiver 13 to different TRPs based on a determination of different TRPs or a determination of the UE 10.

[0038] In some embodiments, the processor 21 is configured to control the UE 10 to receive a TA command from at least one of the first TRP and the second TRP, wherein the TA command includes a first TA value and a second TA value; the processor 21 is configured to control the UE 10 to update the first TA value and the second TA value separately or simultaneously; and / or the processor 21 is configured to control the UE 10 to process or avoid overlap in the time domain of uplink signals sent by the transceiver 13 to different TRPs based on a determination of different TRPs or a determination of the UE 10.

[0039] Figure 3It is a flowchart of a multi-TRP transmission method 300 performed by a UE according to an embodiment of the present application. In some embodiments, the multi-TRP transmission method 300 performed by the UE includes: step 310, the UE receives a timing advance (TA) command from at least one of a first TRP and a second TRP, the TA command including a first TA value and a second TA value; step 320, the UE updates the first TA value and the second TA value separately or simultaneously; and / or step 330, the UE processes or avoids the overlap of uplink signals sent by the UE to different TRPs in the time domain according to the determination of different TRPs or the determination of the UE.

[0040] Figure 4 It is a flowchart of a multi-TRP transmission method 400 performed by a base station (or network) according to an embodiment of the present application. In some embodiments, the multi-TRP transmission method 400 performed by the network includes: step 410, controlling the UE to receive a TA command from at least one of the first TRP and the second TRP, wherein the TA command includes a first TA value and a second TA value; step 420, controlling the UE to update the first TA value and the second TA value separately or simultaneously; and / or step 430, controlling the UE to process or avoid the overlap of uplink signals sent by the UE to different TRPs in the time domain according to the determination of different TRPs or the determination of the UE.

[0041] In some embodiments, the method further includes: receiving, by the UE, a first physical downlink shared channel (PDSCH) sent by the first TRP, carrying a TA command including a first TA value; receiving, by the UE, a second PDSCH sent by the second TRP, carrying a TA command including a second TA value; and when the UE receives the first TA value from the first TRP and the second TA value from the second TRP, the UE separately updates the first TA value and the second TA value. In some embodiments, the TA command includes a first field for indicating the first TRP and the second TRP, the first field including a TRP index field, an index of a control resource set (CORESET) pool field, a sounding reference signal (SRS) resource set index field, or a channel state information-reference signal (CSI-RS) resource set index field.

[0042] In some embodiments, the method further includes: receiving, by the UE, a first PDSCH sent by the first TRP, carrying a TA command including a first TA value and a second TA value; and when the UE receives the first TA value and the second TA value from the first TRP, the UE simultaneously updates the first TA value and the second TA value. In some embodiments, the TA command includes a second field for indicating the second TA value. In some embodiments, the TA command includes a third field for indicating the first TRP and the second TRP, the third field including a TRP index field, an index of a CORESET pool field, an SRS resource set index field, or a CSI-RS resource set index field.

[0043] In some embodiments, the TA command is an absolute TA command media access control control element (MAC CE) or a relative TA command MAC CE. In some embodiments, the UE distinguishes the TA value corresponding to the first TRP and the TA value corresponding to the second TRP according to the TRP index field in the TA command. In some embodiments, the UE distinguishes the first TRP and the second TRP according to the transmission configuration indication (TCI) state information of the first PDSCH or the second PDSCH carrying the TA command, or the scrambling sequence information of the first PDSCH or the second PDSCH carrying the TA command.

[0044] In some embodiments, for determining different TRPs, the uplink signal resources allocated by the network to the UE meet the condition: Δt P +Δt Rx +Δt s >T1, where Δt P =Δt P1 +Δt P2 , Δt P1 is the signal propagation time from the UE to the first TRP, Δt P2 is the signal propagation time from the UE to the second TRP, Δt Rx is the time difference between the start time of the first TRP receiving the first uplink signal and the start time of the second TRP receiving the second uplink signal, and T1 is the duration of the first uplink signal resource.

[0045] In some embodiments, for the determination of the UE, if the uplink signals transmitted by the UE to different TRPs overlap in the time domain, the UE selects one of the uplink signals to transmit to the corresponding TRP. In some embodiments, the UE selects the uplink signal to be transmitted to the corresponding TRP according to a time priority rule or an importance priority rule. In some embodiments, for the time priority rule, if the transmission time of the first uplink signal corresponding to the first TRP is earlier than the transmission time of the second uplink signal corresponding to the second TRP, the UE selects to transmit the first uplink signal to the first TRP and use the first TA value without transmitting the second uplink signal. In some embodiments, for the importance priority rule, if the first uplink signal corresponding to the first TRP is more important than the second uplink signal corresponding to the second TRP, the UE selects to transmit the first uplink signal to the first TRP and use the first TA value without transmitting the second uplink signal.

[0046] In some embodiments, for the determination of the UE, if the uplink signals transmitted by the UE to different TRPs overlap in the time domain, the UE selects to transmit one of the uplink signals to the corresponding TRP and uses the corresponding TA value, and transmits a segment of another uplink signal to another TRP and uses another TA value. In some embodiments, the UE selects the truncated signal according to the time priority rule or the importance priority rule. In some embodiments, if the first uplink signal and the second uplink signal are both PUSCHs carrying data, the UE transmits a segment of the first uplink signal to the first TRP and uses the first TA value, and transmits the complete content of the second uplink signal to the second TRP and uses the second TA value.

[0047] In some embodiments, for the determination of the UE, if the uplink signals transmitted by the UE to different TRPs overlap in the time domain, the UE merges the information carried in one uplink signal into another uplink signal, and transmits the uplink signal containing the merged information to one TRP and uses the corresponding TA value. In some embodiments, if the first uplink signal and the second uplink signal are respectively a PUSCH carrying data and a PUCCH carrying HARQ, the UE merges the HARQ information into the data information, and transmits the first uplink signal to the first TRP and uses the first TA value.

[0048] In some embodiments, for the determination of the UE, if the uplink signals transmitted by the UE to different TRPs overlap in the time domain but the different TRPs of the received signals do not overlap in the time domain, the UE falls back to the current multi-TRP mode using a single TA value. In some embodiments, if there is an overlap in the time domain, the UE first transmits the first uplink signal to the first TRP and uses the first TA value, and then transmits the second uplink signal to the second TRP also using the first TA value.

[0049] In some embodiments, if the UE realizes that the transmission time of uplink signals for different TRPs overlaps, the UE reports indication signaling to the network. In some embodiments, after the UE transmits the uplink signal using a discard method or a fallback method, the UE reports indication signaling to the network. In some embodiments, the indication signaling is a MAC CE or TRP indication that provides a difference between the first TA value and the second TA value. In some embodiments, in order to report the indication signaling, the UE needs to send a scheduling request to the network via a PUCCH. In some embodiments, the network provides the UE with a specific scheduling request configuration to report the indication signaling.

[0050] In the current specification, the Absolute Timing Advance Command (TA Command) MAC CE is included in the Random Access Response (such as message 2 (msg2)) to indicate the absolute TA value of the PUSCH scheduled by the RAR uplink grant (such as message 3 (msg3)) when the UE is in the random access procedure. When the UE is in connected mode, the Timing Advance Command MAC CE is used to indicate the relative TA value for uplink signal transmission. In both types of MAC CEs, the Timing Advance Command field can only indicate 1 TA value. In the case of multiple TRPs with 2 TA values, there are two ways to update the TA value.

[0051] Figure 5 It is a schematic diagram of updating TA1 and TA2 separately according to an embodiment of the present application. Figure 5 It is shown that in some embodiments, a first exemplary method is to update TA1 and TA2 separately. Figure 5 As shown, TRP1 sends the TA1 value through PDSCH1 of the timing advance command MAC CE carrying the TA1 value, and TRP2 sends the TA2 value through PDSCH2 of the timing advance command MAC CE carrying the TA2 value. When the UE receives these MAC CEs, the UE updates the two TA values ​​separately.

[0052] Figure 6 This is a schematic diagram of simultaneously updating TA1 and TA2 according to an embodiment of the present application. Figure 6It is shown that in some embodiments, the second exemplary method is to update TA1 and TA2 simultaneously. Figure 6 As shown, TRP1 sends TA1 and TA2 values ​​via PDSCH1 of the timing advance command MAC CE carrying the TA1 and TA2 values. When the UE receives these MAC CEs, the UE updates the two TA values ​​simultaneously. In another embodiment, TRP2 sends TA1 and TA2 values ​​via PDSCH2 of the timing advance command MAC CE carrying the TA1 and TA2 values. When the UE receives these MAC CEs, the UE updates the two TA values ​​simultaneously.

[0053] Figure 7 This is an example schematic diagram of MAC CE content according to an embodiment of the present application. Figure 7 It is shown that, in some embodiments, for the first exemplary method (updating 2 TA values), both the absolute timing advance command MAC CE and the relative timing advance command MAC CE in the current specification can be reused to update 2 TA values. On the other hand, a new field can be added to these two MAC CEs to explicitly indicate TRP. This new field can be an explicit TRP index, a CORESET pool index, an SRS resource set index, or a CSI-RS resource set index. Figure 7 An example of the new Timing Advance Command MAC CE is shown.

[0054] Figure 8 This is another example schematic diagram of MAC CE content according to an embodiment of the present application. Figure 8 It is shown that, in some embodiments, for the second exemplary method, the absolute timing advance command MAC CE and the relative timing advance command MAC CE need to be enhanced based on the current specification. The first way is to add a new field to indicate the second TA value. Figure 8 (a) shows an example of the first method. The second method is to add a new field based on the first method to explicitly indicate the TRP. This new field can be an explicit TRP index, a CORESET pool index, an SRS resource set index, or a CSI-RS resource set index. Figure 8 (b) shows an example of the second approach.

[0055] When the UE receives the absolute timing advance command (TA command) MAC CE and the relative timing advance command MAC CE, the UE needs to distinguish which TA belongs to which TRP. The methods of distinction include explicit and implicit methods. For the explicit method, the UE can distinguish which TRP the TA belongs to based on the TRP index field in the MAC CE. For the implicit method, the UE can distinguish which TRP the TA belongs to based on the TCI status information of the PDSCH carrying the MAC CE or the scrambling sequence information of the PDSCH carrying the MAC CE.

[0056] In the current specification, since there is only 1 TA, the advance time for the UE to send uplink (UL) signals to different TRPs is the same. In this case, the UL signals sent by the UE to different TRPs do not overlap in transmission time. However, after the introduction of 2 TAs, the advance time for the UE to send UL signals to different TRPs is different. In this case, the UL signals sent by the UE to different TRPs may overlap in transmission time. For a single-transmit (Tx) UE, it is not possible to send UL signals simultaneously. In addition, for UEs with multi-panel simultaneous transmission capabilities, the WID of Release 18 prohibits the UE from sending different UL channels, such as PUSCH and PUCCH, simultaneously. Therefore, some methods are proposed to avoid or handle this overlapping situation.

[0057] Fig. 9 It is a schematic diagram illustrating the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application. Fig. 9 In some embodiments, Fig. 9 (a) shows the case of 1 TA, Fig. 9 (b) shows the case of 2 TAs. UL signal 1 is sent from the UE to TRP1, and UL signal 2 is sent from the UE to TRP2. There is no overlap in the time domain when TRP1 receives UL signal 1 and TRP2 receives UL signal 2. In the case of 1 TA, the UE can send UL signal 1 and UL signal 2 sequentially. Therefore, there is no overlap in the time domain when the UE sends UL signal 1 and UL signal 2. However, in the case of 2 TAs, assuming that TA2 is larger than TA1, the UE needs to send UL signal 2 earlier. Therefore, when the UE sends UL signal 1 and UL signal 2, overlap occurs in the time domain.

[0058] Fig.10 It is a schematic diagram illustrating the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application. Fig.10 It is shown that, in some embodiments, if the time difference Δt between the start time of UE sending UL signal 1 and the start time of UE sending UL signal 2 is TxIf the duration T1 of UL signal 1 is greater than that of UL signal 1, the transmission time of UL signal 1 and UL signal 2 will not overlap. According to the analysis, the formula is: t P1 +Δt Tx =t P2 +Δt Rx , where t P1 is the signal propagation time from UE to TRP1, t P2 is the signal propagation time from UE to TRP2, Δt Rx is the time difference between the start time of TRP1 receiving UL signal 1 and the start time of TRP2 receiving UL signal 2. Therefore: Δt Tx =(t P2 -t P1 )+Δt Rx =Δt P +Δt Rx Therefore, if Δt P +Δt Rx >T1, then the transmission time of UL signal 1 and UL signal 2 will not overlap. In some embodiments, the switching time of UE between different beams also needs to be considered. Therefore, the condition of no overlap becomes: Δt P +Δt Rx +Δt s >T1. Usually, the signal propagation time is related to the TA value. For example, according to the definition of Long Term Evolution (LTE) and New Radio (NR), the signal propagation time is half of the TA value.

[0059] For the network, the signal propagation time depends on the measurement results of the previous UL signals (such as PRACH, SRS, etc.). The switching time of different beams depends on the capabilities of the UE. The duration of the UL signal and the difference in the reception time of different UL signals depend on the network's resource allocation. Therefore, if the network knows these parameters in the above conditions, signal overlap can be avoided. It is recommended that the network avoid overlap of UE sending signals to different TRPs by reasonably allocating UL signal resources to the UE to meet the following conditions: Δt P +Δt Rx +Δt s >T1.

[0060] In some embodiments, a TRP may not know the TA value from the UE to another TRP, and a TRP may not be able to predict the reception time of the UL signal from the UE to another TRP. Therefore, it is necessary for the UE to decide how to send UL signals to different TRPs.

[0061] Fig.11 It is a schematic diagram illustrating the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application. Fig.11As shown, for the exemplary overall discarding method, in some embodiments, if the UL signals sent by the UE to different TRPs overlap in the time domain, the UE can select a signal to send to the corresponding TRP according to certain rules, such as a time priority rule or an importance priority rule. For the time priority rule, such as Fig.11 As shown in (a), if both UL signal 1 and UL signal 2 are PUSCHs with data, and the transmission time of UL signal 1 is earlier than the transmission time of UL signal 2, the UE chooses to send UL signal 1 to TRP1 (using TA1) instead of sending UL signal 2 to TRP2. For the importance priority rule, Fig.11 As shown in (b), if UL signal 1 is a PUSCH with data and UL signal 2 is a PUCCH with HARQ, the UE chooses to send UL signal 2 to TRP2 (using TA2) instead of sending UL signal 1 to TRP1.

[0062] Fig.12 It is a schematic diagram illustrating the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application. Fig.12 In some embodiments, if the UL signals sent by the UE to different TRPs overlap in the time domain, the UE may choose to send one signal to the corresponding TRP and send a segment of another UL signal to another TRP. The selection of which signal to truncate may also follow a time priority rule or an importance priority rule. For example, for an exemplary segment discarding method, Fig.12 As shown, if both UL signal 1 and UL signal 2 are PUSCHs with data, the UE can send the fragmented UL signal 1 to TRP1 (using TA1) and send the complete UL signal 2 to TRP2 (using TA2). It should be noted that the truncated signal is UL signal 1 instead of UL signal 2, because in the PUSCH with time domain overlap, DMRS is more important than data.

[0063] Fig.13 It is a schematic diagram illustrating the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application. Fig.13 In some embodiments, if the UL signals sent by the UE to different TRPs overlap in the time domain, the UE may merge the information carried in one UL signal into another UL signal, and send the UL signal carrying the merged information to one TRP using the corresponding TA. For example, for an exemplary merging method, such as Fig.13 As shown, if UL signal 1 is a PUSCH with data and UL signal 2 is a PUCCH with HARQ (possibly 2 bits), the UE can merge the HARQ information into the data information and send UL signal 1 to TRP1 (using TA1).

[0064] Fig.14 It is a schematic diagram illustrating the transmission time of the UL signal sent by the UE to different TRPs according to an embodiment of the present application. Fig.14 As shown, for an exemplary fallback method, in some embodiments, if the UL signals sent by the UE to different TRPs have overlap in the time domain, but are received by different TRPs without overlap in the time domain, the UE can fall back to the current standard mode, i.e., the multi-TRP mode with 1 TA. Fig.14 As shown, if there is overlap in the time domain, the UE can send UL signal 1 to TRP1 (using TA1), and then send UL signal 2 to TRP2 using TA1 as well. Although this mechanism reduces the reception performance of UL signal 2, the resources of UL signal 2 are not wasted. This means that this exemplary method can save time and frequency resources.

[0065] Fig.15 It is a schematic diagram illustrating an indication signaling report according to an embodiment of the present application. Fig.15 It is shown that in some embodiments, if the UE realizes that the transmission time of the UL signals sent to different TRPs overlaps, the UE can report the indication signaling to the network. After the UE transmits the UL signal using the discard or fallback method, the indication signaling can also be reported to the network. This indication signaling can let the network know that the resource allocation in the time domain is unreasonable. In addition, its content can be a MAC CE that provides the difference between the two TA values. Fig.15 An example of a MAC CE is shown, where the R field can contain other information, such as a TRP indication. In order to report this indication signaling, the UE needs to send a scheduling request to the network via the PUCCH. Therefore, it is recommended that the network provide the UE with a specifically configured scheduling request for reporting this indication signaling.

[0066] In summary, some embodiments of the present application provide methods for solving the problem of updating two TA values ​​and avoiding UL transmission overlap. In order to update two TA values, methods of separate updating and simultaneous updating are proposed. In order to indicate two TA values, an exemplary method of enhancing the traditional MAC CE is proposed. In order to distinguish two TA values ​​in the enhanced MAC CE, explicit and implicit methods are proposed. In order to avoid UL transmission overlap, an exemplary method of reasonably allocating resources for TRP in the time domain is proposed. In addition, in order to avoid UL transmission overlap, a UE discarding and fallback method is also proposed. Indication signaling report is proposed to let TRP know about overlapping events. The beneficial effects of some embodiments of the present application include at least one of the following: 1. A method of updating two TA values ​​separately and simultaneously is introduced. 2. MAC CE is enhanced to indicate two TA values. 3. Explicit and implicit methods of distinguishing two TA values ​​from MAC CE are introduced. 4. A method of allocating resources to TRP to avoid UL transmission overlap is proposed. 5. A method of overall discarding, segment discarding, merging and / or fallback for UE to avoid UL transmission overlap is introduced. 6. A reporting mechanism is introduced to enable UE to report overlapping events to TRP.

[0067] Fig.16 7 is a block diagram of an exemplary wireless communication system 700 according to an embodiment of the present application. The embodiments described herein may be implemented into a system using any appropriately configured hardware and / or software. Fig.16 A system 700 is shown, which includes a radio frequency (RF) circuit 710, a baseband circuit 720, an application circuit 730, a memory / storage device 740, a display 750, a camera 760, a sensor 770, and an input / output (I / O) interface 780, which are coupled to each other at least as shown. The application circuit 730 may include circuits, such as but not limited to one or more single-core or multi-core processors. The processor may include any combination of general-purpose processors and special-purpose processors, such as a graphics processor, an application processor. The processor may be coupled to a memory / storage device and configured to execute instructions stored in the memory / storage device to enable various applications and / or operating systems to run on the system.

[0068] While the present disclosure has been described in connection with what is considered to be the most practical and preferred embodiment, it is to be understood that the present disclosure is not limited to the disclosed embodiment, but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

1. A multi-TRP transmission method, performed by a user equipment UE, characterized in that: include: Receiving, by the UE, a timing advance (TA) command from at least one of a first TRP and a second TRP, wherein the TA command includes a first TA value and a second TA value; The UE updates the first TA value and the second TA value individually or simultaneously; and / or Based on the determination of different TRPs or the determination of the UE, the overlap of the uplink signal transmitted by the UE to different TRPs in the time domain is processed or avoided.

2. The method according to claim 1, characterized in that Also includes: Receiving, by the UE, a first physical downlink shared channel PDSCH carrying the first TA value and sent by the first TRP; Receiving, by the UE, a second PDSCH carrying the second TA value and sent by the second TRP; When the UE receives the first TA value from the first TRP and the second TA value from the second TRP, the first TA value and the second TA value are updated respectively.

3. The method according to claim 1 or 2, characterized in that: The TA command includes a first field for indicating the first TRP and the second TRP, and the first field includes a TRP index field, an index of a control resource set CORESET pool field, a sounding reference signal SRS resource set index field, or a channel state information-reference signal CSI-RS resource set index field.

4. The method according to claim 1, characterized in that: Also includes: Receiving, by the UE, a first PDSCH sent by the first TRP and carrying the first TA value and the second TA value; When the UE receives the first TA value and the second TA value from the first TRP, the first TA value and the second TA value are updated simultaneously.

5. The method according to claim 4, characterized in that The TA command includes a second field for indicating the second TA value.

6. The method according to claim 5, characterized in that The TA command includes a third field for indicating the first TRP and the second TRP, and the third field includes a TRP index field, an index of a CORESET pool field, an SRS resource set index field, or a CSI-RS resource set index field.

7. The method according to any one of claims 1 to 6, characterized in that The TA command is an absolute TA command media access control element MAC CE or a relative TA command MAC CE.

8. The method according to claim 3 or 6, characterized in that: The UE distinguishes the TA value corresponding to the first TRP and the TA value corresponding to the second TRP according to the TRP index field in the TA command.

9. The method according to any one of claims 3 to 8, characterized in that The UE distinguishes the first TRP from the second TRP based on TCI status information or scrambling sequence information indicated by the transmission configuration of the first PDSCH or the second PDSCH carrying the TA command.

10. The method according to any one of claims 1 to 9, characterized in that For the determination of different TRPs, the uplink signal resources allocated by the network to the UE meet the condition: Δt P +Δt Rx +Δt s >T1, where Δt P =Δt P1 +Δt P2 , Δt P1 is the signal propagation time from the UE to the first TRP, Δt P2 is the signal propagation time from the UE to the second TRP, Δt Rx is the time difference between the start time of the first TRP receiving the first uplink signal and the start time of the second TRP receiving the second uplink signal, and T1 is the duration of the first uplink signal resource.

11. The method according to any one of claims 1 to 9, characterized in that Regarding the determination of the UE, if the uplink signals transmitted by the UE to different TRPs overlap in the time domain, the UE selects one of the uplink signals to transmit to the corresponding TRP.

12. The method according to claim 11, characterized in that The UE selects the uplink signal to be transmitted to the corresponding TRP according to the time priority rule or the importance priority rule.

13. The method according to claim 12, characterized in that For the time priority rule, if the transmission time of the first uplink signal corresponding to the first TRP is earlier than the transmission time of the second uplink signal corresponding to the second TRP, the UE chooses to transmit the first uplink signal to the first TRP and use the first TA value instead of transmitting the second uplink signal.

14. The method according to claim 12, characterized in that For the importance priority rule, if the first uplink signal corresponding to the first TRP is more important than the second uplink signal corresponding to the second TRP, the UE chooses to transmit the first uplink signal to the first TRP and use the first TA value instead of transmitting the second uplink signal.

15. The method according to any one of claims 1 to 9, characterized in that Regarding the determination of the UE, if the uplink signals transmitted by the UE to different TRPs overlap in the time domain, the UE selects to transmit one of the uplink signals to the corresponding TRP and use the corresponding TA value, and at the same time transmits a fragment of another uplink signal to another TRP and uses another TA value.

16. The method according to claim 15, characterized in that The UE selects the truncated signal according to the time priority rule or the importance priority rule.

17. The method according to claim 15 or 16, characterized in that If the first uplink signal and the second uplink signal are both PUSCHs carrying data, the UE transmits a fragment of the first uplink signal to the first TRP and uses the first TA value, and transmits the entire content of the second uplink signal to the second TRP and uses the second TA value.

18. The method according to any one of claims 1 to 9, characterized in that Regarding the determination of the UE, if the uplink signals transmitted by the UE to different TRPs overlap in the time domain, the UE merges the information carried in one uplink signal into another uplink signal, and transmits the uplink signal containing the merged information to one TRP and uses the corresponding TA value.

19. The method according to claim 18, characterized in that If the first uplink signal and the second uplink signal are respectively a PUSCH carrying data and a PUCCH carrying HARQ, the UE merges the HARQ information into the data information, and transmits the first uplink signal to the first TRP and uses the first TA value.

20. The method according to any one of claims 1 to 9, characterized in that For the determination of the UE, if the uplink signals transmitted by the UE to different TRPs overlap in the time domain but the different TRPs of the received signals do not overlap in the time domain, the UE falls back to the current multi-TRP mode using a single TA value.

21. The method according to claim 20, characterized in that If there is an overlap in the time domain, the UE first transmits the first uplink signal to the first TRP and uses the first TA value, and then transmits the second uplink signal to the second TRP and also uses the first TA value.

22. The method according to any one of claims 1 to 21, characterized in that If the UE is aware that the transmission times of uplink signals for different TRPs overlap, the UE reports indication signaling to the network.

23. The method according to claim 22, characterized in that After the UE transmits the uplink signal using a discard method or a fallback method, the UE reports indication signaling to the network.

24. The method according to claim 22 or 23, characterized in that The indication signaling is a MAC CE or TRP indication providing a difference between the first TA value and the second TA value.

25. The method according to any one of claims 22 to 24, characterized in that In order to report the indication signaling, the UE needs to send a scheduling request to the network through the PUCCH.

26. The method according to claim 24, characterized in that The network provides a specific scheduling request configuration for the UE to report the indication signaling.

27. A method for transmitting multiple TRPs performed by a network, characterized in that: include: Controlling the UE to receive a TA command including a first TA value and a second TA value, wherein the TA command comes from at least one of the first TRP and the second TRP; Controlling the UE to update the first TA value and the second TA value individually or simultaneously; and / or Control the UE to process or avoid overlapping of uplink signals transmitted to different TRPs in the time domain according to the determination of different TRPs or the determination of the UE.

28. A user equipment, characterized in that: include: Memory; Transceiver; as well as a processor coupled to the memory and the transceiver; Wherein, the processor is configured to execute the method of any one of claims 1 to 26.

29. A network, characterized in that include: Memory; Transceiver; as well as a processor coupled to the memory and the transceiver; Wherein, the processor is configured to execute the method of claim 27.

30. A non-transitory machine-readable storage medium, characterized in that: Instructions are stored thereon, and when a computer executes the instructions, the instructions cause the computer to perform the method of any one of claims 1 to 27.

31. A chip, characterized in that: include: A processor configured to call and run a computer program stored in a memory so that a device equipped with the chip executes a method according to any one of claims 1 to 27.

32. A computer-readable storage medium, characterized in that: A computer program is stored therein, wherein the computer program causes a computer to execute the method of any one of claims 1 to 27.

33. A computer program product, characterized in that Comprising a computer program, wherein the computer program causes a computer to perform the method of any one of claims 1 to 27.

34. A computer program, characterized in that The computer program causes a computer to execute the method of any one of claims 1 to 27.

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