L2 Relay UE System Information Delivery Optimization
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently providing system information (SI) to remote user equipment (UE) through a layer 2 (L2) relay, especially when the remote UE is out of coverage or in an RRC idle/inactive state, leading to increased power consumption in relay UEs due to unsolicited re-broadcasting of SI.
Innovation Solution
The implementation of an L2 relay system that enables on-demand SI retrieval and reduction of SI information forwarded to remote UEs based on their state, using decode and forward relay technology and PC5 interface for sidelink communication, allowing for efficient SI acquisition and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If relay UE performs unsolicited re-broadcasting of system information, then remote UE can obtain system information, but power consumption of relay UE increases
Solution Approach 1:
The relay UE performs unsolicited re-broadcasting of system information in advance before the remote UE requests it. This ensures the remote UE can immediately obtain system information without waiting for a request-response cycle, resolving the contradiction by proactively delivering information to avoid repeated transmissions and reduce overall power consumption.
Solution Approach 2:
The patent extracts and forwards only the essential system information blocks (SIB1, SIB2, and other necessary SIBs) that the remote UE needs, rather than broadcasting all system information. This selective extraction reduces the amount of data the relay UE must transmit and process, thereby reducing power consumption while still delivering necessary information.
2Loss of information
If relay UE forwards complete system information, then remote UE receives all SI, but data transmission overhead increases
Solution Approach 1:
The relay UE selectively extracts and forwards only the necessary system information blocks (SIB1, SIB2, and other essential SIBs) that the remote UE needs for basic network access and operation. Less critical SIBs are omitted from the relayed transmission, reducing data overhead while maintaining information completeness for essential operations.
Solution Approach 2:
The patent applies different quality levels of system information forwarding based on the remote UE's state and requirements. For example, when the remote UE is in idle state, only essential SIBs are forwarded, while more complete information may be provided when the UE is in connected state. This local adaptation optimizes the balance between information completeness and transmission overhead.
Data Source
AI summary
Systems, apparatus and methods enable layer 2 (L2) relaying optimizations for a remote user equipment (UE) to receive system information (SI) from a relay UE. The relay UE may establish a sidelink communication channel with the remote UE that is in a radio resource control (RRC) idle state, an RRC inactive state, or an out-of-coverage (OOC) state with respect to the base station. The relay UE decodes a relay SI request received through the sidelink communication channel from the first remote UE. The relay SI request indicates requested system information. The Relay UE obtains the requested system information or a subset of the requested system information from a memory device or from the base station and encodes a relay SI response to send to the first remote UE. The relay SI response includes the requested system information or the subset of the requested system information.