Relay UE SLRB Mapping for Unambiguous SideLink Routing
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Solution Overview
Problem
In a UE-to-UE relaying architecture, existing technologies face challenges in ensuring unambiguous data routing between remote UEs due to the lack of coordinated identifier management for upper layer bearers and lower layer channels, particularly in scenarios where physical distance or obstructions hinder direct communication.
Innovation Solution
The method involves establishing RLC channels between remote UEs and a relay UE, with end-to-end identifiers being used to uniquely map incoming transmissions to outgoing transmissions, ensuring correct data routing by including identifiers in the adaptation layer or lower layers like the MAC layer, and negotiating these identifiers during channel and SLRB setup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a relay UE is introduced to forward data between remote UEs, then communication coverage is extended to distant or obstructed scenarios, but identifier management complexity increases due to the need to map upper layer bearers to lower layer channels
Solution Approach 1:
The patent applies preliminary action by pre-establishing mapping relationships between upper layer bearers and lower layer channels during the SLRB setup phase. The relay UE stores these mappings in advance, so when data needs to be forwarded, the routing is already determined without requiring complex real-time identifier management. This resolves the contradiction by preparing identifier mappings beforehand, extending communication coverage while maintaining manageable complexity.
2Measurement precision
If end-to-end identifiers are used in upper layers, then data routing accuracy is improved, but the need to coordinate identifier assignment between multiple UEs increases system complexity
Solution Approach 1:
The patent uses the relay UE as an intermediary to manage end-to-end identifier assignments. The relay UE coordinates with both remote UEs to ensure unique identifier allocation, acting as a central authority that simplifies the overall system. This resolves the contradiction by concentrating identifier management responsibilities in a single intermediary node, maintaining high routing accuracy while reducing distributed coordination complexity.
Solution Approach 2:
The patent enables self-service by allowing each UE to autonomously manage its own identifier assignments within its local context. Remote UEs can independently select identifiers that do not conflict with their own communications, and the relay UE independently maps these to appropriate channels. This resolves the contradiction by distributing identifier management responsibilities, achieving accurate routing through local autonomy without requiring complex global coordination.
3Adaptability or versatility
If hop-by-hop channel termination is implemented in lower layers, then flexible relay routing is enabled, but the mapping between upper layer bearers and lower layer channels becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the bearer-to-channel mapping into separate, independent mappings for each hop. The relay UE maintains distinct mapping relationships for the first hop (remote UE 1 to relay UE) and the second hop (relay UE to remote UE 2), rather than managing a complex end-to-end mapping. This resolves the contradiction by segmenting the mapping problem into manageable pieces, enabling flexible relay routing while reducing overall mapping complexity.
Data Source
AI summary
A method executed by a relay UE is provided. The relay UE receives an incoming SideLink (SL) transmission from the first remote UE on the first RLC channel, wherein the first RLC channel is associated with an SL Radio Bearer (SLRB) ID, in which the incoming SL transmission includes the first identifier, which includes the SLRB ID and a first UE ID. The relay UE sends an outgoing SL transmission to a second remote UE on a second RLC channel according to the SLRB ID and the first UE ID.