US-12621851-B2 - Handling sidelink transmissions and receptions

US12621851B2US 12621851 B2US12621851 B2US 12621851B2US-12621851-B2

Abstract

A method comprising receiving an indication from a transmitting terminal device indicative of a sidelink resource reserved for receiving a subsequent sidelink transmission from the transmitting terminal device, detecting that the subsequent sidelink transmission is not received from the transmitting terminal device over the reserved sidelink resource, determining a sidelink complementary resource set window, and monitoring the sidelink complementary resource set window for receiving the subsequent sidelink transmission from the transmitting terminal device.

Inventors

Lianghai JI
Nuno Manuel Kiilerich Pratas
Ling Yu
Vinh Van Phan

Assignees

NOKIA TECHNOLOGIES OY

Dates

Publication Date: 20260505
Application Date: 20211210
Priority Date: 20210113

Claims (1)

1 . An apparatus comprising at least one processor, and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus at least to: receive an indication from a transmitting terminal device indicative of a sidelink resource reserved for receiving a subsequent sidelink transmission from the transmitting terminal device; detect that the subsequent sidelink transmission is not received from the transmitting terminal device over the reserved sidelink resource; as a response to detecting that the subsequent sidelink transmission was not received over the reserved sidelink resource, monitor a sidelink complementary resource set window for receiving the subsequent sidelink transmission from the transmitting terminal device, wherein the sidelink complementary resource set window occurs between the reserved sidelink resource and a following reserved sidelink resource or a following discontinuous reception active period of the apparatus, and does not overlap with a sidelink discontinuous reception on-duration of the apparatus, wherein a size of the sidelink complementary resource set window is dynamically adjusted by signaling received during the sidelink complementary resource set window, the signaling comprising a channel busy ratio measurement reported by the transmitting terminal device, the size of the sidelink complementary resource set window being increased when the reported channel busy ratio exceeds a configured threshold; obtain a configuration for determining the sidelink complementary resource set window, wherein the configuration comprises: a set of sidelink complementary resources defined in a time and frequency domain, the sidelink complementary resource set window being determined as a subset of the set of sidelink complementary resources based on the detecting; a time offset of the sidelink complementary resource set window with respect to the reserved sidelink resource, the time offset being defined as an amount of sidelink slots following the reserved sidelink resource; a size of the sidelink complementary resource set window; a criterion and/or requirement to use the sidelink complementary resource set window for receiving the subsequent sidelink transmission from the transmitting terminal device; and a way to use the sidelink complementary resource set window for receiving the subsequent sidelink transmission from the transmitting terminal device, wherein obtaining the configuration comprises: obtaining the configuration from a memory of the apparatus; obtaining the configuration from a base station; and obtaining the configuration from the transmitting terminal device; and determine the sidelink complementary resource set window based on the configuration and a sidelink radio condition of a previous sidelink transmission received from the transmitting terminal device, wherein the sidelink radio condition comprises a sidelink reference signal received power above a configured threshold and the sidelink complementary resource set window is not monitored when the sidelink reference signal received power is below the configured threshold.

Description

RELATED APPLICATION This application was originally filed as PCT Application No. PCT/EP2021/085169 on Dec. 10, 2021, which claims priority from EP application Ser. No. 21/151,307.2, filed on Jan. 13, 2021, each of which is incorporated herein by reference in its entirety. FIELD The following exemplary embodiments relate to wireless communication and to sidelink transmissions between terminal devices. BACKGROUND Wireless communication may take place between terminal devices via an access node. Such communication may be seen as a hierarchical communication. While it has its benefits, there may also be communication taking place directly between two or more devices without having an access node in-between. BRIEF DESCRIPTION The scope of protection sought for various embodiments is set out by the independent claims. The exemplary embodiments and features, if any, described in this specification that do not fall under the scope of the independent claims are to be interpreted as examples useful for understanding various embodiments of the invention. According to a first aspect there is provided an apparatus comprising at least one processor, and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to receive an indication from a transmitting terminal device indicative of a sidelink resource reserved for receiving a subsequent sidelink transmission from the transmitting terminal device, detect that the subsequent sidelink transmission is not received from the transmitting terminal device over the reserved sidelink resource, determine a sidelink complementary resource set window, and monitor the sidelink complementary resource set window for receiving the subsequent sidelink transmission from the transmitting terminal device. According to a second aspect there is provided an apparatus comprising at least one processor, and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to transmit an indication to a terminal device indicative of a sidelink resource reserved for transmitting a subsequent sidelink transmission, detect that the subsequent sidelink transmission will not be transmitted over the reserved sidelink resource, determine a sidelink complementary resource set window, and transmit the subsequent sidelink transmission over a resource within the sidelink complementary resource set window. According to a third aspect there is provided an apparatus comprising means for receiving an indication from a transmitting terminal device indicative of a sidelink resource reserved for receiving a subsequent sidelink transmission from the transmitting terminal device, detecting that the subsequent sidelink transmission is not received from the transmitting terminal device over the reserved sidelink resource, determining a sidelink complementary resource set window, and monitoring the sidelink complementary resource set window for receiving the subsequent sidelink transmission from the transmitting terminal device. According to a fourth aspect there is provided an apparatus comprising means for transmitting an indication to a terminal device indicative of a sidelink resource reserved for transmitting a subsequent sidelink transmission, detecting that the subsequent sidelink transmission will not be transmitted over the reserved sidelink resource, determining a sidelink complementary resource set window, and transmitting the subsequent sidelink transmission over a resource within the sidelink complementary resource set window. According to a fifth aspect there is provided a method comprising receiving an indication from a transmitting terminal device indicative of a sidelink resource reserved for receiving a subsequent sidelink transmission from the transmitting terminal device, detecting that the subsequent sidelink transmission is not received from the transmitting terminal device over the reserved sidelink resource, determining a sidelink complementary resource set window, and monitoring the sidelink complementary resource set window for receiving the subsequent sidelink transmission from the transmitting terminal device. According to a sixth aspect there is provided a method comprising transmitting an indication to a terminal device indicative of a sidelink resource reserved for transmitting a subsequent sidelink transmission, detecting that the subsequent sidelink transmission will not be transmitted over the reserved sidelink resource, determining a sidelink complementary resource set window, and transmitting the subsequent sidelink transmission over a resource within the sidelink complementary resource set window. According to a seventh aspect there is provided a computer program comprising instructions for causing an apparatus to perform at least t