US-12621808-B2 - Method for resource selection and first device

US12621808B2US 12621808 B2US12621808 B2US 12621808B2US-12621808-B2

Abstract

The disclosure provides a method for resource selection and a first device. The method is applied to a first device and includes the following. A first signaling is transmitted to a second device, where the first signaling is used to trigger the second device to transmit a resource set to the first device, and the resource set is used to assist the first device in sidelink (SL) transmission resource selection. The resource set is received from the second device. A resource for SL transmission is selected according to the resource set.

Inventors

Shichang Zhang
Zhenshan Zhao
Yi Ding
Huei-Ming Lin

Assignees

GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

Dates

Publication Date: 20260505
Application Date: 20230913

Claims (18)

1 . A method for resource selection, being applied to a first device and comprising: determining a resource in a sidelink (SL) grant in a discontinuous reception (DRX) active time for a second device as a resource for transmitting a first signaling; transmitting the first signaling to the second device, the first signaling being used to trigger the second device to transmit a resource set to the first device, and the resource set being used to assist the first device in SL transmission resource selection; receiving the resource set from the second device; and selecting a resource for SL transmission according to the resource set.
2 . The method of claim 1 , wherein a transmission time of the first signaling is in the DRX active time for the second device.
3 . The method of claim 1 , further comprising: triggering resource reselection if resources in the SL grant in the DRX active time for the second device are insufficient.
4 . The method of claim 1 , wherein determining the resource for transmitting the first signaling comprises: selecting the resource for transmitting the first signaling from a resource pool randomly the DRX active time for the second device.
5 . The method of claim 1 , wherein determining the resource for transmitting the first signaling comprises: determining a resource obtained through resource reselection of the first device as the resource for transmitting the first signaling.
6 . The method of claim 5 , wherein determining the resource obtained through the resource reselection of the first device as the resource for transmitting the first signaling comprises one of the following: determining a resource in the DRX active time for the second device after the resource reselection of the first device as the resource for transmitting the first signaling; determining at least one physical sidelink shared channel (PSSCH) resource for transmitting a first transport block (TB) after the resource reselection of the first device as the resource for transmitting the first signaling; and determining at least one physical sidelink control channel (PSCCH) resource for scheduling transmission of a first TB after the resource reselection of the first device as the resource for transmitting the first signaling.
7 . The method of claim 1 , wherein transmitting the first signaling to the second device comprises: transmitting the first signaling to the second device when a predefined condition is satisfied, wherein the predefined condition comprises at least one of: the first device having triggered or being about to trigger resource reselection; a priority of SL data to be transmitted by the first device being greater than a priority threshold; the first device determining that a number of consecutive reception failures of a PSSCH by the second device from the first device is greater than a predefined number; or a delay of the SL data to be transmitted by the first device being greater than a delay threshold.
8 . The method of claim 1 , wherein the first signaling is carried in a specific bit field of a PSCCH, a medium access control-control element (MAC CE) in a PSSCH, a second sidelink control information (SCI), or a PC5 radio resource control (RRC).
9 . A method for resource selection, being applied to a second device and comprising: receiving a first signaling from a first device in a discontinuous reception (DRX) active time for the second device, wherein a resource in a sidelink (SL) grant in the DRX active time for the second device is determined as a resource for transmitting the first signaling, the first signaling is used to trigger the second device to transmit a resource set to the first device, and the resource set is used to assist the first device in SL transmission resource selection; and transmitting the resource set to the first device according to the first signaling.
10 . The method of claim 9 , wherein the resource set comprises a resource suitable or unsuitable SL transmission by the first device.
11 . The method of claim 9 , wherein before transmitting the resource set to the first device according to the first signaling, the method further comprises: determining the resource set according to the first signaling.
12 . The method of claim 11 , wherein the first signaling comprises at least one of: a transmission resource pool of the first device; a priority prio_TX of SL data to be transmitted by the first device; a start and an end of a resource selection window for resource selection to be performed by the first device; a delay requirement of the SL data to be transmitted by the first device; a frequency-domain resource size L_subCH adopted in the resource selection to be performed by the first device; or a resource reservation period P_rsvp_TX adopted in the resource selection to be performed by the first device.
13 . The method of claim 12 , wherein determining the resource set according to the first signaling comprises: determining a resource suitable or unsuitable SL transmission by the first device in the resource selection window according to the resource selection window indicated in the first signaling.
14 . The method of claim 11 , wherein the first signaling comprises at least one of: a transmission resource pool of the first device; M resources selected by the first device, wherein M is a positive integer greater than or equal to 1; or a remaining tolerable delay for SL data transmission by the first device.
15 . The method of claim 14 , wherein determining the resource set according to the first signaling comprises: determining a resource suitable or unsuitable SL transmission by the first device from the M resources according to the M resources indicated in the first signaling.
16 . The method of claim 11 , wherein transmitting the resource set to the first device comprises: transmitting the resource set to the first device in a first time unit, and determining the resource set according to the first signaling comprises: determining a resource suitable or unsuitable SL transmission by the first device in a predefined time period after the first time unit.
17 . The method of claim 11 , wherein transmitting the resource set to the first device comprises: transmitting the resource set to the first device in a first time unit, and determining the resource set according to the first signaling comprises: determining a resource suitable or unsuitable SL transmission by the first device in a predefined time period after the first time unit; and determining a resource suitable or unsuitable SL transmission by the first device from M resources according to the M resources indicated in the first signaling.
18 . A first device, comprising: a processor; and a memory configured to store computer programs; wherein the processor is configured to invoke and execute the computer programs stored in the memory to cause the first device to: determine a resource in a sidelink (SL) grant in a discontinuous reception (DRX) active time for a second device as a resource for transmitting a first signaling; transmit the first signaling to the second device, the first signaling being used to trigger the second device to transmit a resource set to the first device, and the resource set being used to assist the first device in SL transmission resource selection; receive the resource set from the second device; and select a resource for SL transmission according to the resource set.

Description

CROSS REFERENCE TO RELATED APPLICATION(S) This application is a continuation of International Application No. PCT/CN2021/081789, filed Mar. 19, 2021, the entire disclosure of which is incorporated herein by reference. TECHNICAL FIELD Implementations of the disclosure relate to the field of wireless communication technologies, and more particularly, to a method for resource selection and a first device. BACKGROUND As a key technology for 5th generation (5G) mobile networks, device-to-device (D2D) communication includes vehicle-to-vehicle (V2V) communication or vehicle-to-everything (V2X) communication. Sidelink (SL) transmission technologies are introduced in D2D communication. Different from receiving and transmitting communication data via a base station in traditional cellular systems, D2D communication adopts terminal-to-terminal direct communication and thus has a higher spectral efficiency and a lower transmission delay. At present, the 3rd generation partnership project (3GPP) defines two transmission modes in V2X technologies. In one transmission mode, the terminal transmits data on an SL according to a resource allocated by the base station, where the base station can allocate to the terminal a resource for single transmission or a resource for semi-static transmission. In the other transmission mode, the terminal determines a candidate resource set according to an existing listening process, and then autonomously selects a resource for SL transmission from the candidate resource set. In the second transmission mode, there are problems such as hidden terminals and half-duplex constraints. To solve these problems, an enhanced resource selection scheme is proposed. In the enhanced resource selection scheme, on the basis of resource listening in the second transmission mode, one terminal (UE-A) may transmit a resource set to another terminal (UE-B) to assist UE-B in resource selection. In addition, in the second transmission mode, the terminal needs to continuously listen resources in the listening process to determine which resources are available, which results in excessive power consumption of the terminal. For energy saving, a discontinuous reception (DRX) mechanism is considered to be introduced in an SL system. With the introduction of the SL DRX mechanism, for the enhanced resource selection scheme, when a terminal transmits data or a signaling to another terminal, the other terminal may be in the sleep state, which may affect the transmission performance of the whole system, and may also cause the terminal to be unable to considering resource sets of other terminals in resource selection. Therefore, it is necessary to further optimize the enhanced resource selection scheme. SUMMARY In a first aspect, a method for resource selection is provided. The method is applied to a first device and includes the following. A first signaling is transmitted to a second device, where the first signaling is used to trigger the second device to transmit a resource set to the first device, and the resource set is used to assist the first device in sidelink (SL) transmission resource selection. The resource set is received from the second device. A resource for SL transmission is selected according to the resource set. In a second aspect, a method for resource selection is provided. The method is applied to a second device and includes the following. A first signaling is received from a first device in a discontinuous reception (DRX) active time for the second device, where the first signaling is used to trigger the second device to transmit a resource set to the first device, and the resource set is used to assist the first device in SL transmission resource selection. The resource set is transmitted to the first device according to the first signaling. In a third aspect, a first device is provided. The first device includes a processor, a transceiver, and a memory configured to store computer programs. The processor is configured to invoke and execute the computer programs stored in the memory to: cause the transceiver to transmit a first signaling to a second device, where the first signaling is used to trigger the second device to transmit a resource set to the first device, and the resource set is used to assist the first device in SL transmission resource selection, cause the transceiver to receive the resource set from the second device, and select a resource for SL transmission according to the resource set. Other features and aspects of the disclosed features will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, which illustrate, by way of example, the features in accordance with implementations of the disclosure. The summary is not intended to limit the scope of any implementations described herein. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a first schematic diagram illustrating an application scenario provided in implementations of the disc