Sidelink DRX Configuration via Relay UE for Multi-Path Operation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently configuring Sidelink Discontinuous Reception (DRX) for multi-path scenarios, particularly for remote UEs that are out of direct coverage or connected to different base stations, leading to increased signal overhead and delayed DRX configuration.
Innovation Solution
A method where a remote UE establishes an RRC connection with a relay UE and transmits preferred DRX configuration information to a base station through the relay UE, allowing the base station to directly configure SL DRX for both UEs, leveraging multi-path communication capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a remote UE establishes RRC connection through a relay UE in multi-path scenarios, then the DRX configuration can be applied quickly and signal overhead is reduced, but the complexity of the communication path increases
Solution Approach 1:
The relay UE acts as an intermediary between the remote UE and the base station, forwarding RRC messages and enabling the remote UE to obtain DRX configuration without direct connection. This mediator approach allows quick configuration application while managing the complexity through standardized relay protocols.
Solution Approach 2:
The communication path is segmented into multiple hops (base station -> relay UE -> remote UE), allowing the DRX configuration to be transmitted and applied in discrete steps. This segmentation enables the remote UE to receive configuration information through available paths without requiring direct connection.
2Adaptability or versatility
If a remote UE out of direct coverage uses relay UE for communication, then coverage is extended, but the signal overhead increases
Solution Approach 1:
The relay UE performs multiple functions simultaneously: it acts as a remote UE for its own communications while also serving as a base station for the remote UE, and simultaneously functions as a relay for forwarding RRC messages. This multi-functionality extends coverage without requiring additional dedicated infrastructure.
3Productivity
If the base station directly configures SL DRX for both relay UE and remote UE, then communication efficiency is improved, but the configuration complexity increases
Solution Approach 1:
The base station performs preliminary configuration by sending RRCReconfiguration messages to the relay UE containing the DRX parameters before the remote UE needs to apply them. This preliminary action allows the configuration to be prepared and transmitted in advance, improving efficiency while managing complexity through structured message formats.
Data Source
AI summary
An embodiment relates to an operation method of a remote user equipment (UE) in a wireless communication system, the method comprising: establishing, by the remote UE, a radio resource control (RRC) connection with a relay UE; and transmitting, to a base station by the remote UE, sidelink information including preferred DRX configuration information of the remote UE, wherein on the basis that both the remote UE and the relay UE are RRC_CONNECTED with the base station, the remote UE directly receives, from the base station, an SL DRX configuration of the relay UE and an SL DRX configuration of the remote UE, and applies the SL DRX configuration of the remote UE.