阅读说明：本技术 用于侧链路通信的消息的按需中继 (On-demand relaying of messages for sidelink communications ) 是由 T·V·恩古延 S·K·巴盖尔 K·古拉蒂 A·巴德瓦 于 2020-03-13 设计创作，主要内容包括：描述了用于无线通信的方法、系统和设备。在一些系统(例如,车联网(V2X)系统)中,源用户装备(UE)可以将数据分组多播到周围的UE。在一些情形中,接收方UE可能由于阻塞、遮蔽或干扰而未能接收到传输。接收方UE可以多播请求分组的重传的消息。成功地从源UE接收到数据分组并且从接收方UE接收到中继请求消息的任何周围UE可以确定是否中继该分组。确定是否中继分组可以基于参考信号收到功率(RSRP)阈值、可用资源、到被阻塞的UE的距离或其某种组合。在一些示例中,即使在接收方UE与原始源UE之间的路径被阻塞的情况下,接收方UE也可以成功地从中继UE接收经中继的分组。(Methods, systems, and devices for wireless communication are described. In some systems, such as a vehicle networking (V2X) system, a source User Equipment (UE) may multicast data packets to surrounding UEs. In some cases, the receiving UE may fail to receive the transmission due to blocking, shadowing, or interference. The recipient UE may multicast a message requesting retransmission of the packet. Any surrounding UEs that successfully received a data packet from the source UE and received a relay request message from the recipient UE may determine whether to relay the packet. Determining whether to relay a packet may be based on a Reference Signal Received Power (RSRP) threshold, available resources, distance to a blocked UE, or some combination thereof. In some examples, the recipient UE may successfully receive the relayed packet from the relay UE even if the path between the recipient UE and the original source UE is blocked.)