Relay UE Coverage Indicators for Reliable Path Selection
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Solution Overview
Problem
In wireless communication systems, it is challenging for remote UE devices to determine whether candidate relay UE devices are in coverage when evaluating multiple paths to a target UE device, especially in situations where the relay UE devices may be out of coverage, affecting the reliability and selection of optimal relay paths.
Innovation Solution
Relay UE devices transmit coverage indicators that include information on their cell coverage status and relay capabilities, allowing remote UE devices to evaluate and select the most suitable relay path based on reliability, latency, and flexibility, using these indicators in discovery messages to communicate their ability to provide U2U or U2N relay services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UE devices do not transmit coverage indicators, then device complexity and communication overhead are reduced, but remote UE devices cannot reliably determine coverage status and select optimal relay paths
Solution Approach 1:
Relay UE devices transmit coverage indicators in advance as part of discovery messages, enabling remote UE devices to evaluate relay candidates before establishing connections. This preliminary information provision resolves the contradiction by ensuring reliable path selection without requiring complex real-time assessment mechanisms.
Solution Approach 2:
Coverage indicators serve as intermediary information elements that bridge the gap between relay UE devices and remote UE devices. These indicators carry essential coverage status and capability information, enabling reliable relay selection while maintaining protocol simplicity through standardized message structures.
2Adaptability or versatility
If relay UE devices transmit detailed coverage indicators, then remote UE devices can make informed relay path selections, but communication overhead and information processing increase
Solution Approach 1:
Coverage indicators are segmented into distinct information elements including coverage status, relay capability indicators for U2U and U2N services, and cell identification. This segmentation allows remote UE devices to process only the specific information needed for their relay selection criteria, reducing overall information processing overhead while maintaining selection flexibility.
Solution Approach 2:
Different parts of the coverage indicator serve different functions: coverage status indicators provide binary coverage information, capability indicators specify supported relay types, and cell identification provides network context. This local quality differentiation enables efficient information processing by matching indicator details to specific selection requirements.
Data Source
AI summary
Relay user equipment (UE) devices transmit coverage indicators to notify remote UE devices of coverage status and relay capability. Each coverage indicator may include an indication that the relay UE device is in coverage of cell and identification of the cell. For the examples, the coverage indicator indicates the relay capability of the relay UE device with an indication on whether the relay UE device is capable of providing U2U relay service to a target UE device. U2N relay service to a base station, or both U2U and U2N relay service. A remote UE device searching for a preferred relay UE device evaluates the conditions based on the information provided in the coverage indicators to select a preferred relay path from two or more relay paths through candidate relay UE devices.