METHOD AND DEVICE IN NODES USED FOR WIRELESS COMMUNICATION
The present disclosure provides a method and a device in a node used for wireless communications. A first node performs channel detection in a first time window to determine a candidate time-frequency resource pool and then receives a first signaling, the first signaling being used to determine a first time-frequency resource set; and transmits a target signaling, the target signaling being used for reserving a candidate time-frequency resource set; the candidate time-frequency resource pool comprises the candidate time-frequency resource set; the candidate time-frequency resource set is reserved for transmission of a first TB; the channel detection is related to the first TB's type. Through designing the present disclosure manages to associate time-frequency resources covered by the channel detection with the first TB's type or duration, thus enhancing the performance of channel detection, which further optimizes sidelink transmission performance and efficiency.
1 . A first node for wireless communications, comprising:
a first receiver, performing channel detection in a first time window to determine a candidate time-frequency resource pool;
a second receiver, receiving a first signaling, the first signaling being used to determine a first time-frequency resource set;
a first transmitter, transmitting a target signaling, the target signaling being used to reserve a candidate time-frequency resource set;
wherein the candidate time-frequency resource pool comprises the candidate time-frequency resource set; time-domain resources occupied by the first time-frequency resource set belong to the first time window; the candidate time-frequency resource set is reserved for transmission of a first transport block (TB); whether the channel detection comprises a detection on the first time-frequency resource set is related to a type of the first TB, or whether the channel detection comprises a detection on the first time-frequency resource set is related to a duration of the first time window in time domain; the first signaling is Sidelink Control Information (SCI); the target signaling is SCI; the candidate time-frequency resource pool occupies a positive integer number of Physical Resource Block(s) (PRB(s)) in frequency domain; the channel detection is a measurement of a Reference Signal Received Power (RSRP) of Demodulation Reference Signal (DMRS) in a Physical Sidelink Shared Channel (PSSCH).
2 . The first node according to claim 1 , wherein the type of the first TB is related to a duration of the candidate time-frequency resource set in time domain.
3 . The first node according to claim 1 , wherein the first transmitter determines the candidate time-frequency resource set from the candidate time-frequency resource pool; the candidate time-frequency resource pool comprises K1 second-type time-frequency resource sets, and the candidate time-frequency resource set is a best one of the K1 second-type time-frequency resource sets.
4 . The first node according to claim 1 , wherein the second receiver receives a second signaling; the second signaling is used for reserving the first time-frequency resource set.
5 . The first node according to claim 1 , wherein the first transmitter transmits a first signal; the first TB is used to generate the first signal, the first signal being transmitted in the candidate time-frequency resource set.
6 . The first node according to claim 1 , wherein the phrase that whether the channel detection comprises a detection on the first time-frequency resource set is related to a type of the first TB means that: the type of the first TB is a first type, and the channel detection comprises a detection on the first time-frequency resource set; or, the type of the first TB is a second type, and the channel detection does not comprise a detection on the first time-frequency resource set; the type of the first TB being the first type means that a duration of time-domain resources occupied by the first TB in time domain is smaller than a first threshold; while the type of the first TB being the second type means that a duration of time-domain resources occupied by the first TB in time domain is no smaller than a first threshold.
7 . The first node according to claim 1 , wherein the phrase that whether the channel detection comprises a detection on the first time-frequency resource set is related to a duration of the first time window in time domain means that the duration of the first time window in time domain is smaller than a fourth threshold, and the channel detection comprises the detection on the first time-frequency resource set; or the duration of the first time window in time domain is no smaller than a fourth threshold, and the channel detection does not comprise the detection on the first time-frequency resource set; the fourth threshold is measured in milliseconds (ms).
8 . The first node according to claim 1 , wherein the first node performs channel detection on M1 sub-channels in the first time window, M1 being a positive integer greater than K1; a result yielded by the channel detection is used for transmission of the first TB, the candidate time-frequency resource pool comprises K1 second-type time-frequency resource sets, and the K1 second-type time-frequency resource sets respectively occupy K1 sub-channels, any sub-channel among the K1 sub-channels belongs to the M1 sub-channels, K1 being no less than a product of M1 and 0.2, and an RSRP of DMRS in a PSSCH on any of the K1 sub-channels is no higher than a first decision threshold; the first decision threshold is measured in dBm, or the first decision threshold is measured in mW.
9 . The first node according to claim 4 , wherein the first signaling is used for pre-empting the first time-frequency resource set, or the first signaling is used for covering the second signaling.
10 . The first node according to claim 4 , wherein the second signaling is used to indicate multiple time-frequency resource sets, and the first time-frequency resource set is one of the multiple time-frequency resource sets; the first signaling indicates the first time-frequency resource set; and transmission of the first signaling is later than transmission of the second signaling.
11 . The first node according to claim 4 , wherein the second signaling is used to schedule a second-type signal; the first signaling is used to schedule a first-type signal, or the first signaling is used for pre-empting the first-type signal; services corresponding to the first-type signal are of a higher priority than services corresponding to the second-type signal.
12 . The first node according to claim 4 , wherein a transmitter of the first signaling is different from a transmitter of the second signaling.
13 . The first node according to claim 1 , wherein the first time window comprises a positive integer number of slot(s).
14 . The first node according to claim 1 , wherein the candidate time-frequency resource pool occupies a positive integer number of sub-channel(s) in frequency domain; frequency-domain resources occupied by the sub-channel comprise frequency-domain resources corresponding to a positive integer number of PRB(s).
15 . The first node according to claim 1 , wherein the first transport block is a Transport Block (TB).
16 . The first node according to claim 1 , wherein the channel detection is performed on M1 sub-channels in the first time window, and the channel detection is a detection of PSSCH on the M1 sub-channels in the first time window, the detection of the PSSCH on the M1 sub-channels is a detection of RSRP of DMRS based on the PSSCH.
17 . The first node according to claim 1 , wherein the phrase that whether the channel detection comprises a detection on the first time-frequency resource set is related to a type of the first TB includes a meaning that the type of the first TB is a first type, and the channel detection comprises a detection on the first time-frequency resource set; or, the type of the first TB is a second type, and the channel detection comprises no detection on the first time-frequency resource set.
18 . A second node for wireless communications, comprising:
a third receiver, receiving a target signaling, the target signaling being used for reserving a candidate time-frequency resource set;
wherein a transmitter of the target signaling performs channel detection in a first time window to determine a candidate time-frequency resource pool, and the candidate time-frequency resource set belongs to the candidate time-frequency resource pool; the transmitter of the target signaling also receives a first signaling, the first signaling being used to determine a first time-frequency resource set; time-domain resources occupied by the first time-frequency resource set belong to the first time window; the candidate time-frequency resource set is reserved for transmission of a first TB; whether the channel detection comprises a detection on the first time-frequency resource set is related to a type of the first TB, or whether the channel detection comprises a detection on the first time-frequency resource set is related to a duration of the first time window in time domain.
19 . A method in a first node for wireless communications, comprising:
performing channel detection in a first time window to determine a candidate time-frequency resource pool;
receiving a first signaling, the first signaling being used to determine a first time-frequency resource set; and
transmitting a target signaling, the target signaling being used to reserve a candidate time-frequency resource set;
wherein the candidate time-frequency resource pool comprises the candidate time-frequency resource set; time-domain resources occupied by the first time-frequency resource set belong to the first time window; the candidate time-frequency resource set is reserved for transmission of a first transport block (TB); whether the channel detection comprises a detection on the first time-frequency resource set is related to a type of the first TB, or whether the channel detection comprises a detection on the first time-frequency resource set is related to a duration of the first time window in time domain.
20 . The method according to claim 19 , wherein the type of the first TB is related to a duration of the candidate time-frequency resource set in time domain.