Data transmission method and device
A data transmission method and a device are provided. An exemplary data transmission method includes: determining a transport block size (TBS); and sending or receiving information according to the determined TBS.
1 . A data transmission method, performed by a communication device, the method comprising:
determining a Transport Block Size (TBS) according to indication information; and
sending or receiving information according to the determined TBS,
wherein the determining the TBS comprises:
determining whether to ignore an overhead of a Physical Sidelink Feedback CHannel (PSFCH) according to a period parameter of the PSFCH and Sidelink Control Information (SCI), comprising:
in response to the period parameter of the PSFCH being a first preset value, determining to ignore the overhead of the PSFCH in calculating the TBS;
in response to the period parameter of the PSFCH being a value different from the first preset value, determining to whether to ignore the overhead of the PSFCH in calculating the TBS further according to a PSFCH overhead indication field in the SCI, comprising:
in response to the PSFCH overhead indication field in SCI instructing to ignore the overhead of the PSFCH, determining to ignore the overhead of the PSFCH; and
in response to the PSFCH overhead indication field in SCI instructing not to ignore the overhead of the PSFCH, determining not to ignore the overhead of the PSFCH.
2 . The method according to claim 1 , wherein the determining the TBS further comprises one of the following:
when the TBS is calculated, ignoring the overhead of the PSFCH;
when a resource pool is not configured with the PSFCH, and when the TBS of a transport block transmitted in the resource pool is calculated, ignoring the overhead of the PSFCH; or
when the period parameter of the PSFCH configured by the resource pool is 0, and when the TBS of the transport block transmitted in the resource pool is calculated, ignoring the overhead of the PSFCH.
3 . The method according to claim 2 , wherein the overhead of the PSFCH is determined according to a configuration of the PSFCH;
the overhead of the PSFCH is determined according to a configuration of a predefined or pre-configured PSFCH; or
the overhead of the PSFCH is pre-configured or predefined.
4 . The method according to claim 1 , wherein the SCI is a first stage SCI.
5 . The method according to claim 1 , wherein the determining the TBS further comprises:
when the TBS of a transport block transmitted in a resource pool is calculated, subtracting an overhead of a Channel State Information-Reference Signal (CSI-RS) or a Tracking Reference Signal (TRS) from a scheduled resource.
6 . The method according to claim 4 , wherein the overhead of the CSI-RS or TRS is:
determined by a configuration of the CSI-RS or TRS in the scheduled resource;
a predefined, pre-configured or configured CSI-RS or TRS pattern or an overhead value; or
determined by the configuration of the CSI-RS or TRS indicated in the control information, wherein the control information is used to indicate that the TBS is re-calculated.
7 . The method according to claim 1 , wherein the determining the TBS comprises:
when an initial transmission of a transport block is configured with a Channel State Information-Reference Signal (CSI-RS) or Tracking Reference Signal (TRS), and when the TBS is calculated in a transmission process of the transport block, subtracting an overhead of the CSI-RS or TRS from a scheduled resource;
when an initial transmission of a transport block is not configured with a CSI-RS or TRS, and when the TBS is calculated in the transmission process of the transport block, ignoring the overhead of the CSI-RS or TRS; or
when a certain transmission of the transport block is configured with a Channel State Information-Reference Signal (CSI-RS) or a Tracking Reference Signal (TRS), and when the TBS is calculated in this transmission process and the later retransmission process of the transport block, subtracting the overhead of the CSI-RS or TRS from the scheduled resource.
8 . The method according to claim 1 , wherein when control information for scheduling a transport block indicates that the TBS is re-calculated and the control information is further used to configure a Channel State Information-Reference Signal (CSI-RS) or a Tracking Reference Signal (TRS), the determining the TBS comprises:
when the TBS is calculated in this transmission process and the later retransmission process of the transport block, subtracting an overhead of the CSI-RS or TRS from a scheduled resource; or
when the TBS is calculated from this transmission of the transport block to the next control information indicating TBS re-calculation, subtracting the overhead of the CSI-RS or TRS from the scheduled resource.
9 . The method according to claim 1 , wherein
wherein the indication information is further used to indicate whether to ignore an overhead of a Channel State Information-Reference Signal (CSI-RS) or a Tracking Reference Signal (TRS) when the TBS is determined.
10 . The method according to claim 1 , wherein the determining the TBS further comprises:
when the TBS is calculated in an initial transmission and retransmission processes of a transport block, determining a modulation order or code rate according to an actual Modulation and Coding Scheme (MCS) of the transport block scheduled by control information to calculate the TBS.
11 . The method according to claim 1 ,
wherein the indication information is comprised in control information for scheduling a transport block, and the indication information is used to indicate whether to re-calculate the TBS.
12 . The method according to claim 11 , wherein the indication information is used to indicate that buffer information of the transport block is cleared and the TBS is re-calculated; or
wherein the indication information is used to indicate that the TBS is not re-calculated; and
the determining the TBS further comprises; taking the TBS calculated by the latest effect control information of a transport block as the TBS of transport block scheduled by control information carrying the indication information.
13 . The method according to claim 11 , wherein when at least one of the following conditions is met, the indication information indicates that the TBS is re-calculated:
New Data Indicator (NDI) is turned over;
ACKnowledgement (ACK) information is not received after transmission of the transport block;
Negative ACKnowledgement (NACK) information is received after transmission of the transport block; or
a number of blind retransmissions of the transport block reaches a preset threshold.
14 . The method according to claim 1 , wherein the determining the TBS further comprises:
when a number of blind retransmissions of the transport block reaches a preset threshold, re-calculating the TBS.
15 . The method according to claim 1 , wherein the determining the TBS further comprises:
subtracting a target resource overhead from a scheduled resource to calculate the TBS,
wherein the target resource overhead is determined according to configuration information.
16 . The method according to claim 15 , wherein the target resource overhead is related to at least one of the following:
a resource overhead of a Channel State Information-Reference Signal (CSI-RS); or
a resource overhead of a Phase-Tracking Reference Signal (PTRS).
17 . The method according to claim 1 , wherein:
when the period parameter of the PSFCH is 0, the overhead of the PSFCH is ignored;
when the period parameter of the PSFCH is 1, the overhead of the PSFCH is not ignored; and
when the period parameter of the PSFCH is 2 or 4, whether to ignore the overhead of the PSFCH is determined according to the PSFCH overhead indication field in the SCI.
18 . A communication device, comprising:
a memory storing computer-readable instructions; and
a processor coupled to the memory and configured to execute the computer-readable instructions, wherein the computer-readable instructions, when executed by the processor, cause the processor to perform operations comprising:
determining a Transport Block Size (TBS) according to indication information; and
sending or receiving information according to the determined TBS,
wherein the determining the TBS comprises:
determining whether to ignore an overhead of a Physical Sidelink Feedback CHannel (PSFCH) according to a period parameter of the PSFCH and Sidelink Control Information (SCI), comprising:
in response to the period parameter of the PSFCH being a first preset value, determining to ignore the overhead of the PSFCH in calculating the TBS;
in response to the period parameter of the PSFCH being a value different from the first preset value, determining to whether to ignore the overhead of the PSFCH in calculating the TBS further according to a PSFCH overhead indication field in the SCI, comprising:
in response to the PSFCH overhead indication field in the SCI instructing to ignore the overhead of the PSFCH, determining to ignore the overhead of the PSFCH; and
in response to the PSFCH overhead indication field in the SCI instructing not to ignore the overhead of the PSFCH, determining not to ignore the overhead of the PSFCH.
19 . The communication device according to claim 8 , wherein the SCI is a first stage SCI.
20 . A non-transitory computer readable medium storing instructions that, when executed by a processor, cause the processor to perform a data transmission method, wherein the method comprises:
determining a Transport Block Size (TBS) according to indication information; and
sending or receiving information according to the determined TBS,
wherein the determining the TBS comprises:
determining whether to ignore an overhead of a Physical Sidelink Feedback CHannel (PSFCH) according to a period parameter of the PSFCH and Sidelink Control Information (SCI), comprising:
in response to the period parameter of the PSFCH being a first preset value, determining to ignore the overhead of the PSFCH in calculating the TBS;
in response to the period parameter of the PSFCH being a value different from the first preset value, determining to whether to ignore the overhead of the PSFCH in calculating the TBS further according to a PSFCH overhead indication field in the SCI, comprising:
in response to the PSFCH overhead indication field in the SCI instructing to ignore the overhead of the PSFCH, determining to ignore the overhead of the PSFCH; and
in response to the PSFCH overhead indication field in the SCI instructing not to ignore the overhead of the PSFCH, determining not to ignore the overhead of the PSFCH.