WTRU Path Selection and Duplication for Sidelink Relay
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Solution Overview
Problem
Current New Radio (NR) sidelink relay technologies face limitations in coverage extension and Quality of Service (QoS) support, particularly in scenarios without Uu coverage, and lack multi-hop relay support, which restricts the effectiveness of NR-based sidelink communications.
Innovation Solution
A method for path selection and duplication in Wireless Transmit/Receive Units (WTRUs) that considers configuration information including radio thresholds and channel occupancy ratios, allowing for direct or sidelink paths, or combinations thereof, to optimize data transmission and ensure reliable connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-hop sidelink relay is used for coverage extension, then connectivity is achieved in limited scenarios, but coverage extension and reliability are insufficient in areas without Uu coverage
Solution Approach 1:
The patent segments the communication path into multiple hops, allowing data to be transmitted through intermediate WTRUs when direct single-hop connectivity is unavailable. This multi-hop segmentation enables coverage extension while maintaining reliability by providing alternative transmission paths.
Solution Approach 2:
The patent introduces intermediary WTRUs that act as relays between the source and destination. These intermediary nodes forward data when direct communication is not possible, thereby extending coverage while maintaining connection reliability through indirect paths.
2Reliability
If path selection is based on multiple parameters (radio threshold, signal quality, CBR), then transmission reliability is improved, but system complexity increases
Solution Approach 1:
The patent performs preliminary actions by pre-configuring path selection parameters and thresholds. The WTRU monitors and evaluates multiple parameters (radio threshold, signal quality, CBR) in advance to determine optimal paths, which simplifies real-time decision-making while maintaining high transmission reliability.
Solution Approach 2:
The patent implements dynamic path selection that adapts to changing network conditions by continuously monitoring multiple parameters. The system dynamically adjusts path choices based on real-time radio threshold, signal quality, and CBR measurements, achieving reliable transmission without requiring complex manual configuration.
3Reliability
If path duplication is implemented for service continuity, then reliability is improved, but resource consumption and system complexity increase
Solution Approach 1:
The patent implements partial path duplication by maintaining multiple potential paths but only actively using them when needed for service continuity. This approach provides reliability through redundancy while consuming resources only partially, as full duplication of all paths is not maintained simultaneously under normal conditions.
Data Source
AI summary
Methods and apparatuses for path selection and duplication are described herein. A method performed by a Wireless Transmit/Receive Unit, WTRU, may comprise receiving (1501) configuration information regarding path selection, the configuration information including configured parameters associated with network conditions and/or WTRU conditions. For example, the configured parameters may include a radio threshold, a signal quality threshold, and/or a channel busy ratio/channel occupancy ratio. CBR/CR, threshold. The WTRU may monitor (1502) the current network conditions and/or WTRU conditions. If UL data becomes available (1503) for transmission, the WTRU may determine (1504) one or more paths for transmission based on the configuration information and the current conditions. The one or more paths may comprise a direct path, a sidelink path, both a direct path and a sidelink path, or two sidelink paths.