WTRU Relay Reselection Based on Traffic and RSRP Thresholds
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing relay selection and reselection for WTRU-to-WTRU relays, particularly in determining optimal relay connections based on traffic conditions and signal quality, leading to suboptimal data transmission performance.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to perform relay selection and reselection based on active traffic and reference signal received power (RSRP) measurements, using threshold-based criteria and data transmission gap analysis to determine when to initiate relay reselection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay selection is performed frequently to maintain optimal signal quality, then signal quality improves, but data transmission gaps increase and transmission efficiency deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting relay selection triggers based on traffic conditions. When traffic is active, relay reselection is suppressed even if signal quality degrades, unless thresholds are severely violated. When traffic is inactive, relay reselection is permitted to maintain optimal signal quality. This conditional parameter adjustment resolves the contradiction by making relay selection behavior adaptive to traffic states rather than following a fixed threshold-based approach.
2Productivity
If relay reselection is performed based on multiple criteria including active data determination, then transmission efficiency improves, but device complexity increases
Solution Approach 1:
The patent segments the relay selection process into distinct evaluation stages: first determining whether traffic is active or inactive, then applying different threshold criteria based on this classification. This segmentation allows the system to use simplified single-threshold evaluation during active traffic and more comprehensive multi-threshold evaluation during inactive traffic, thereby improving overall transmission efficiency while managing device complexity through structured decision-making.
Solution Approach 2:
The patent implements preliminary action by performing active data determination before applying relay selection threshold criteria. This preliminary classification of traffic state enables the system to pre-determine which set of selection criteria should be applied, avoiding the need to continuously evaluate all possible relay candidates regardless of traffic conditions. This preliminary step improves transmission efficiency by preventing unnecessary relay reselection evaluations during active data transmission.
3Reliability
If strict threshold criteria are applied for relay selection, then signal quality reliability improves, but the number of available relays decreases
Solution Approach 1:
The patent applies dynamics by making relay selection criteria adaptive rather than static. The threshold criteria dynamically adjust based on the determined traffic state (active or inactive) and the specific relay's signal quality characteristics. During active traffic, the system dynamically suppresses reselection to maintain current connection stability. During inactive traffic, the system dynamically permits reselection to improve signal quality. This dynamic approach ensures reliable relay connections while maintaining adaptability to different operational conditions and available relay options.
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for relay selection associated with WTRU-to-WTRU relays. A wireless transmit/receive unit (WTRU) may be configured to perform relay selection associated with WTRU-to-WTRU relays. The WTRU may (e.g., determine to) perform relay (re)selection, for example, based on active traffic and/or performed measurements (e.g., reference signal received power (RSRP) measurements). The WTRU may perform network assisted relay (re)selection. The WTRU (e.g., in coverage WTRU) may initiate a connection (e.g., RRC connection) or trigger a message (e.g., RRC message), for example, based on WTRU-to-WTRU relaying criteria. The WTRU may report measurements to the network, for example, based on multiple hops.