Relay UE Sidelink Paging for Out-of-Coverage UEs
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in effectively transmitting paging messages to user equipment (UEs) that are out of coverage or in idle/inactive states, leading to failed transmissions due to channel state issues or physical barriers, which affects latency and reliability in services like emergency messaging.
Innovation Solution
The method involves a relay UE that receives a paging relay request message from a base station and transmits the paging message to a target UE through sidelink channels, utilizing physical sidelink control and shared channels, with SCI messages indicating time-frequency resources, enabling reliable communication even when direct Uu interface transmissions fail.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct Uu interface transmission is used for paging messages, then transmission simplicity is maintained, but transmission reliability deteriorates for UEs out of coverage or in idle/inactive states
Solution Approach 1:
The patent introduces a relay UE as an intermediary node between the base station and the target UE. The relay UE receives the paging message from the base station via Uu interface and forwards it to the target UE via sidelink, enabling reliable delivery to UEs out of coverage without requiring direct base station-to-UE connection.
Solution Approach 2:
The patent segments the paging transmission path into two independent segments: (1) base station to relay UE via Uu interface, and (2) relay UE to target UE via sidelink. This segmentation allows each segment to be optimized independently and provides alternative paths when direct transmission fails.
2Adaptability or versatility
If relay UE is introduced for paging transmission, then coverage extension is achieved, but system complexity increases
Solution Approach 1:
The patent enables UEs to autonomously determine whether to act as relay based on their channel conditions and configuration. The relay UE self-configures the sidelink resources and messaging format without requiring complex centralized control, reducing overall system complexity while extending coverage adaptably.
3Reliability
If sidelink channels are used for paging message transmission, then channel state limitations are bypassed, but resource allocation complexity increases
Solution Approach 1:
The patent implements preliminary configuration of sidelink resources through RRC signaling before actual paging transmission. The relay UE and target UE pre-establish resource pools, bandwidth parts, and physical layer parameters, enabling rapid and reliable paging message delivery without complex real-time resource allocation decisions.
Data Source
AI summary
The method of wireless communication may include a relay user equipment (UE) and a target UE. The relay UE may receive, from a base station, a paging relay request message including a paging message for the target UE, the paging relay request message requesting the relay UE to transmit the paging message to the target UE, and transmit a sidelink control information (SCI) type 1 (SCI-1) and/or an SCI type 2 (SCI-2) and the paging message to the target UE through one or more sidelink channels based on the received paging relay request message. The target UE may decode the paging message received from the relay UE.