UE-to-UE Relay Signaling for End-to-End PC5 Connection Setup
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Solution Overview
Problem
Existing wireless communication technologies face challenges in establishing end-to-end data transmission between user equipment (UE) terminals that are far apart, as sidelink communication coverage is limited, and there is no effective method for implementing such connections through relay terminals.
Innovation Solution
A data transmission method and apparatus that enables end-to-end connections between UE terminals using a relay UE, involving the forwarding of sidelink-signaling radio bearers (SL-SRB) through specific PC5 RLC channels based on indication information and adaptation layer processing, with support for one-to-one, many-to-one, or many-to-many mapping configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sidelink communication is used for direct transmission between terminals, then data transmission between adjacent terminals is enabled, but coverage range is limited and transmission between distant terminals cannot be achieved
Solution Approach 1:
The patent introduces a relay terminal as an intermediary device between distant terminals. The relay terminal receives signals from one terminal and forwards them to the other terminal, enabling extended coverage while maintaining transmission reliability through a multi-hop architecture
2Area of stationary object
If a relay terminal is introduced to extend coverage, then transmission between distant terminals becomes possible, but connection establishment complexity increases due to lack of specific methods
Solution Approach 1:
The patent establishes PC5 RLC channels between the relay terminal and remote terminals in advance, before actual data transmission. This preliminary channel setup simplifies the overall connection establishment process by pre-configuring the communication paths needed for relayed transmission
Solution Approach 2:
The patent divides the end-to-end connection into separate PC5 RLC channel segments: one between the first remote terminal and relay terminal, and another between the relay terminal and second remote terminal. This segmentation allows independent configuration and management of each link, reducing overall complexity
3Reliability
If end-to-end connection is established through relay terminal, then data transmission between distant terminals is enabled, but signaling management complexity increases without specific methods
Solution Approach 1:
The patent extracts and separately manages signaling for end-to-end connections versus relay-to-relay connections. By identifying and handling end-to-end SL-SRBs specifically, the system simplifies signaling management by treating different signaling types differently rather than using a uniform complex approach
Data Source
AI summary
Disclosed in the present disclosure are a data transmission method and apparatus in a UE-to-UE relay scenario, and a device and a medium, which are used for realizing the establishment of an end-to-end connection between a first UE and a second UE by means of a relay UE and performing data transmission by means of the end-to-end connection. In the embodiments of the present disclosure, the method comprises: a relay UE supporting a U2U relay function receiving, by means of a first PC5 RLC channel, an SL-SRB sent by a first UE; and in the case that specific indication information associated with the SL-SRB represents that the SL-SRB is an end-to-end SL-SRB, or, in the case that the first PC5 RLC channel is a PC5 RLC channel dedicated to the end-to-end SL-SRB, the relay UE forwarding the SL-SRB to a second UE by means of a second PC5 RLC channel, wherein the first UE is any one of two UEs which need to establish an end-to-end connection by means of the relay UE, and the second UE is an end-to-end target communication opposite end of the first UE. On this basis, the aims of a first UE and a second UE establishing an end-to-end connection by means of a relay UE, and performing data transmission by means of the end-to-end connection can be realized.