UE-to-Network Relay RRC Setup Without PC5-S Encapsulation
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Solution Overview
Problem
Existing UE-to-network relay technologies face challenges in efficiently establishing RRC connections with increased latency and resource consumption due to reliance on PC5-S and PC5-PDCP entities, which are not well-defined for Layer 2 relaying, leading to strained sidelink capacity and computing resource overload.
Innovation Solution
Implementing signaling schemes that bypass encapsulation of RRC connection messages through PC5-S containers and avoid using PC5-SDAP or PC5-PDCP entities, thereby reducing resource consumption and latency by directly handling RRC messages through adaptation layers and Uu bearers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC connection messages are encapsulated through PC5-S containers and processed via PC5-SDAP or PC5-PDCP entities, then the connection can be established through defined protocols, but resource consumption and latency increase due to the complexity of these entities
Solution Approach 1:
The patent extracts the RRC connection message from the complex PC5-S encapsulation pathway and transmits it directly through the PC5 physical layer without involving PC5-SDAP or PC5-PDCP entities. This extraction eliminates unnecessary processing steps while maintaining connection establishment reliability
Solution Approach 2:
The patent introduces an adaptation layer as an intermediary between the RRC message and the PC5 physical layer. This adaptation layer handles the message forwarding without requiring full PC5-S protocol stack processing, thereby reducing latency while maintaining protocol compatibility
2Reliability
If RRC connection messages are encapsulated through PC5-S containers and processed via PC5-SDAP or PC5-PDCP entities, then the connection can be established through defined protocols, but computing resources become overloaded
Solution Approach 1:
The patent extracts the essential RRC connection message transmission function from the resource-intensive PC5-S protocol stack. By bypassing PC5-SDAP and PC5-PDCP entities, the solution eliminates significant computing overhead while preserving the core connection establishment capability
Solution Approach 2:
The adaptation layer performs self-service by directly handling RRC message forwarding without requiring the full PC5 protocol stack. This self-service approach allows the system to maintain reliable connection establishment while consuming minimal computing resources
3Adaptability or versatility
If existing PC5-S and PC5-PDCP entities are used for Layer 2 relaying, then protocol compatibility is maintained, but sidelink capacity becomes strained
Solution Approach 1:
The adaptation layer serves as an intermediary that maintains protocol compatibility with existing PC5-S and PC5-PDCP entities while handling RRC message forwarding independently. This intermediary approach preserves adaptability to existing protocols while preventing sidelink capacity strain by avoiding unnecessary entity involvement
Solution Approach 2:
The patent segments the RRC message transmission pathway from the full PC5 protocol stack. By separating the essential message forwarding function from the complex protocol entities, the solution maintains protocol compatibility where needed while eliminating capacity-straining processing steps
Data Source
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AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a remote user equipment (UE) may establish, via a sidelink signaling interface, a unicast link between the remote UE and a relay UE; establish a connection with a base station via the relay UE, wherein a message associated with establishing the connection is communicated via the unicast link; establish one or more bearers based at least in part on a radio bearer configuration received from the base station via the connection; establish, with the relay UE, one or more sidelink access stratum entities for the one or more bearers using one or more sidelink radio resource control messages based at least in part on an access stratum configuration received from the base station via the connection; and receive or transmit control-plane or user-plane traffic via the one or more bearers.