Timer control method and apparatus, and terminal
A timer control method includes in a case of an occasion for determining that target feedback information needs to be transmitted to a second terminal and the target feedback information being unable to be transmitted through a target PSFCH, starting or prohibiting, by a first terminal, a first timer; where in a running duration of the first timer, the first terminal does not need to monitor control signaling and/or data from the second terminal; and the first terminal communicates with the second terminal through a sidelink.
1 . A timer control method, comprising:
in a case of an occasion for determining that target feedback information needs to be transmitted to a second terminal and the target feedback information being unable to be transmitted through a target physical sidelink feedback channel (PSFCH), starting or prohibiting, by a first terminal, a first timer; wherein
in a running duration of the first timer, the first terminal does not need to monitor control signaling and/or data from the second terminal; and
the first terminal communicates with the second terminal through a sidelink; wherein
the target feedback information being unable to be transmitted through the target PSFCH comprises at least one of following:
under an influence of a first factor, the target PSFCH being unable to complete transmission;
transmission of the target PSFCH not meeting packet delay budget (PDB);
a distance between the first terminal and the second terminal exceeding a communication range indicated in sidelink control information, wherein communication between the first terminal and the second terminal is groupcast communication; wherein
the first factor comprises one of following: limited power of the first terminal, congestion control, and resource unavailability of the target PSFCH.
2 . The method according to claim 1 , wherein duration of the first timer is a minimum time gap from a feedback moment to reception of corresponding retransmission information; or
the target feedback information comprises acknowledgement feedback information or negative-acknowledgement feedback information.
3 . The method according to claim 1 , wherein the target feedback information being unable to be transmitted through the target PSFCH further comprises at least one of following:
transmission of the target PSFCH conflicting with uplink transmission of the first terminal, wherein the first terminal is unable to simultaneously perform the transmission of the PSFCH and the uplink transmission, and the uplink transmission is determined to be prioritized according to a predetermined priority rule;
transmission of the target PSFCH being discarded; and
transmission of the target PSFCH reaching a maximum number of times.
4 . The method according to claim 3 , wherein the transmission on the target PSFCH being discarded comprises at least one of following:
in a case that the number of PSFCHs that need to be transmitted exceeds a maximum number of PSFCHs that are able to be transmitted by the first terminal, the transmission on the target PSFCH being discarded; and
in a case that both a PSFCH resource that needs to be transmitted and a PSFCH resource that needs to be received exist on a transmission occasion of the target PSFCH, the first terminal does not have a capability of performing transmission and reception at the same time, and the first terminal determines to receive the target PSFCH, the transmission on the target PSFCH being discarded.
5 . A data retransmission control method, comprising:
in a case that a second terminal determines that target feedback information of a first terminal is unable to be received through a target physical sidelink feedback channel (PSFCH), determining, by the second terminal, that feedback information of the first terminal is negative-acknowledgement feedback information; and
performing, by the second terminal, retransmission to the first terminal; or
in a case that a second terminal determines that target feedback information of a first terminal is unable to be received through a target PSFCH, determining, by the second terminal, that the target feedback information is acknowledgement feedback information; and
determining, by the second terminal, that there is no need to perform retransmission to the first terminal; wherein
the first terminal communicates with the second terminal through a sidelink; wherein
the second terminal determining that the target feedback information of the first terminal is unable to be received through a target PSFCH comprises one of following:
determining that reception of the target PSFCH conflicts with uplink transmission of the second terminal, wherein the second terminal is unable to simultaneously perform the reception of the PSFCH and the uplink transmission, and the uplink transmission is determined to be prioritized according to a predetermined priority rule;
determining that the number of PSFCHs that need to be received exceeds a maximum number of PSFCHs that are able to be received by the second terminal, wherein reception through the target PSFCH is unable to be performed; and
determining that both a PSFCH resource that needs to be transmitted and a PSFCH resource that needs to be received exist on a transmission occasion of the target PSFCH, wherein the second terminal does not have a capability of performing transmission and reception at the same time, and the second terminal determines to perform transmission of the target PSFCH.
6 . The method according to claim 5 , wherein the performing, by the second terminal, retransmission to the first terminal comprises:
performing, by the second terminal, retransmission on a retransmission resource; wherein
the retransmission resource is outside a running duration of a first timer of the first terminal; and/or the retransmission resource is a periodically reserved retransmission resource; wherein in the running duration of the first timer, the first terminal does not need to monitor data from the second terminal.
7 . The method according to claim 5 , wherein the in a case that a second terminal determines that target feedback information of a first terminal is unable to be received through a target PSFCH, determining, by the second terminal, that feedback information of the first terminal is negative-acknowledgement feedback information comprises:
in a case that the second terminal determines that the target feedback information of the first terminal is unable to be received through the target PSFCH, determining, by the second terminal, that the feedback information of the first terminal is the negative-acknowledgement feedback information based on one of following: protocol prescription, configuration by a network side, and configuration by the first terminal.
8 . The method according to claim 5 , wherein the performing, by the second terminal, retransmission to the first terminal comprises:
determining whether the number of retransmissions exceeds a first threshold; and if yes, stopping the retransmission, otherwise, performing the retransmission once.
9 . The method according to claim 8 , wherein the first threshold is the same as a second threshold, and the second threshold is a maximum retransmission number configured for the second terminal in a case that the feedback information of the first terminal is able to be successfully received.
10 . The method according to claim 8 , wherein the first threshold is different from a second threshold, and the second threshold is a maximum number of retransmissions configured for the second terminal in a case that the feedback information of the first terminal is able to be successfully received.
11 . The method according to claim 5 , wherein the in a case that a second terminal determines that target feedback information of a first terminal is unable to be received through a target PSFCH, determining, by the second terminal, that the target feedback information is acknowledgement feedback information comprises:
in a case that the second terminal determines that the target feedback information of the first terminal is unable to be received through the target PSFCH, determining, by the second terminal, that the target feedback information is the acknowledgement feedback information based on one of following: protocol prescription, configuration by a network side, and configuration by the first terminal.
12 . A terminal, comprising a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein the program or instructions, when executed by the processor, causes the terminal to perform:
in a case of an occasion for determining that target feedback information needs to be transmitted to a second terminal and the target feedback information being unable to be transmitted through a target physical sidelink feedback channel (PSFCH), starting or prohibiting a first timer; wherein
in a running duration of the first timer, the terminal does not need to monitor control signaling and/or data from the second terminal; and
the terminal communicates with the second terminal through a sidelink; wherein
the target feedback information being unable to be transmitted through the target PSFCH comprises at least one of following:
under an influence of a first factor, the target PSFCH being unable to complete transmission;
transmission of the target PSFCH not meeting packet delay budget (PDB);
a distance between the first terminal and the second terminal exceeding a communication range indicated in sidelink control information, wherein communication between the first terminal and the second terminal is groupcast communication; wherein
the first factor comprises one of following: limited power of the first terminal, congestion control, and resource unavailability of the target PSFCH.
13 . The terminal according to claim 12 , wherein the target feedback information being unable to be transmitted through the target PSFCH further comprises at least one of following:
transmission of the target PSFCH conflicting with uplink transmission of the terminal, wherein the terminal is unable to simultaneously perform the transmission of the PSFCH and the uplink transmission, and the uplink transmission is determined to be prioritized according to a predetermined priority rule;
transmission of the target PSFCH being discarded; and
transmission of the target PSFCH reaching a maximum number of times.
14 . The terminal according to claim 13 , wherein the transmission on the target PSFCH being discarded comprises at least one of following:
in a case that the number of PSFCHs that need to be transmitted exceeds a maximum number of PSFCHs that are able to be transmitted by the terminal, the transmission on the target PSFCH being discarded; and
in a case that both a PSFCH resource that needs to be transmitted and a PSFCH resource that needs to be received exist on a transmission occasion of the target PSFCH, the terminal does not have a capability of performing transmission and reception at the same time, and the terminal determines to receive the target PSFCH, the transmission on the target PSFCH being discarded.
15 . A terminal, comprising a processor, a memory, and a program or instructions stored in the memory and executable on the processor, wherein when the program or instructions are executed by the processor, steps of the data retransmission control method according to claim 5 are implemented.