Method and device for performing sidelink communication on basis of sidelink HARQ feedback information in NR V2X
A method in which a first device performs sidelink communication is provided according to one embodiment of the present disclosure. For example, a method in which a first device operates a first timer and/or a second timer on the basis of sidelink HARQ feedback information may be provided.
1 . A method comprising:
transmitting, by a first device, to a second device, first sidelink control information through a first physical sidelink control channel;
transmitting, by the first device, to the second device, second sidelink control information and data, through a first physical sidelink shared channel related to the first physical sidelink control channel;
receiving, by the first device, from the second device, sidelink hybrid automatic repeat request feedback information regarding the first physical sidelink shared channel; and
starting, by the first device, a sidelink discontinuous reception hybrid automatic repeat request round trip time timer for the sidelink hybrid automatic repeat request feedback information regarding the first physical sidelink shared channel,
wherein a first length of the sidelink discontinuous reception hybrid automatic repeat request round trip time timer, which is determined based on deactivation of a transmission of a physical uplink control channel, is different from a second length of the sidelink discontinuous reception hybrid automatic repeat request round trip time timer, which is determined based on activation of the transmission of the physical uplink control channel.
2 . The method of claim 1 , wherein the sidelink hybrid automatic repeat request feedback information is transmitted from the first device to a base station through the physical uplink control channel after the sidelink discontinuous reception hybrid automatic repeat request round trip time timer is started and before expiration, based on the activation of the transmission of the physical uplink control channel.
3 . The method of claim 1 , wherein the first length is shorter than the second length.
4 . The method of claim 1 , wherein configuration information regarding the sidelink discontinuous reception hybrid automatic repeat request round trip time timer is received from a base station.
5 . The method of claim 4 , wherein the configuration information regarding the sidelink discontinuous reception hybrid automatic repeat request round trip time timer includes information regarding the first length or the second length of the sidelink discontinuous reception hybrid automatic repeat request round trip time timer.
6 . The method of claim 1 , wherein a sidelink discontinuous reception retransmission timer for a retransmission from the first device to the second device is started, based on the sidelink hybrid automatic repeat request feedback information being hybrid automatic repeat request negative acknowledgement information representing that the second device has failed to decode data transmitted from the first device through the first physical sidelink shared channel,
wherein the sidelink discontinuous reception retransmission timer is started at a timer point at which the sidelink discontinuous reception hybrid automatic repeat request round trip time timer expires or after the sidelink discontinuous reception hybrid automatic repeat request round trip time timer expires.
7 . The method of claim 6 , further comprising performing sidelink communication with the second device including:
transmitting, to the second device, a third physical sidelink control channel and a third physical sidelink shared channel related to the third physical sidelink control channel after the sidelink discontinuous reception retransmission timer is started.
8 . The method of claim 7 , wherein a transmission resource of the third physical sidelink control channel and the third physical sidelink shared channel is determined based on downlink control information received from a base station after the sidelink discontinuous reception retransmission timer is started.
9 . The method of claim 1 , wherein the sidelink discontinuous reception hybrid automatic repeat request round trip time timer is started after an end point of a sidelink configured grant time resource related to the first physical sidelink control channel, the first physical sidelink shared channel and the sidelink hybrid automatic repeat request feedback information.
10 . The method of claim 1 , wherein the sidelink discontinuous reception hybrid automatic repeat request round trip time timer is started after an end point of a timer resource for a reception of the sidelink hybrid automatic repeat request feedback information.
11 . The method of claim 1 , wherein a second physical sidelink control channel different from the first physical sidelink control channel and a second physical sidelink shared channel different from the first physical sidelink shared channel are not transmitted from the first device to the second device, while the sidelink discontinuous reception hybrid automatic repeat request round trip time timer is running.
12 . A first device comprising:
at least one transceiver;
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first device to perform operations comprising:
transmitting, to a second device, first sidelink control information through a first physical sidelink control channel;
transmitting, to the second device, second sidelink control information and data, through a first physical sidelink shared channel related to the first physical sidelink control channel;
receiving, from the second device, sidelink hybrid automatic repeat request feedback information regarding the first physical sidelink shared channel; and
starting a sidelink discontinuous reception hybrid automatic repeat request round trip time timer for the sidelink hybrid automatic repeat request feedback information regarding the first physical sidelink shared channel,
wherein a first length of the sidelink discontinuous reception hybrid automatic repeat request round trip time timer, which is determined based on deactivation of a transmission of a physical uplink control channel, is different from a second length of the sidelink discontinuous reception hybrid automatic repeat request round trip time timer, which is determined based on activation of the transmission of the physical uplink control channel.
13 . A device configured to control a first user equipment, the device comprising:
at least one processor; and
at least one memory connected to the at least one processor and storing instructions that, based on being executed, cause the first user equipment to perform operations comprising:
transmitting, to a second user equipment, first sidelink control information through a first physical sidelink control channel;
transmitting, to the second user equipment, second sidelink control information and data, through a first physical sidelink shared channel related to the first physical sidelink control channel;
receiving, from the second user equipment, sidelink hybrid automatic repeat request feedback information regarding the first physical sidelink shared channel; and
starting a sidelink discontinuous reception hybrid automatic repeat request round trip time timer for the sidelink hybrid automatic repeat request feedback information regarding the first physical sidelink shared channel,
wherein a first length of the sidelink discontinuous reception hybrid automatic repeat request round trip time timer, which is determined based on deactivation of a transmission of a physical uplink control channel, is different from a second length of the sidelink discontinuous reception hybrid automatic repeat request round trip time timer, which is determined based on activation of the transmission of the physical uplink control channel.