Relay WTRU RLF Indication Logic for Multihop Recovery
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing radio-link failures (RLF) and recovery in multihop and multiconnectivity relay scenarios, particularly in determining the appropriate type of RLF indication and triggering recovery procedures effectively across relay nodes.
Innovation Solution
The system introduces a method where a wireless transmit/receive unit (WTRU) acts as a relay to another WTRU, determining the type of RLF indication based on logical channel weight and hop count, and sends specific RLF indications to trigger appropriate recovery actions, including cell reselection and relay re-establishment, depending on its operating condition and the QoS of the channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay WTRU sends a first type RLF indication to a remote WTRU, then the remote WTRU can perform timely recovery actions, but the relay WTRU may unnecessarily trigger recovery procedures when the parent relay is already handling it
Solution Approach 1:
The relay WTRU monitors RLF indications received from its parent relay and uses this feedback to determine whether to send a first type or second type indication to remote WTRUs. When a second type indication is received from the parent, the relay suppresses first type indications to remote WTRUs, preventing redundant recovery actions while maintaining reliable connectivity management.
Solution Approach 2:
The system dynamically adjusts the type of RLF indication sent by the relay WTRU based on its operating conditions and the state of the parent relay connection. The relay can switch between sending first type indications (when parent is healthy) and second type indications (when parent fails), optimizing the recovery process adaptively.
2Measurement precision
If the relay WTRU determines RLF indication type based on logical channel weight and hop count, then appropriate recovery actions are triggered, but the calculation and decision process becomes more complex
Solution Approach 1:
The relay WTRU uses predefined parameters (logical channel weight and hop count thresholds) to determine the appropriate RLF indication type. By establishing clear parameter-based decision criteria, the system achieves precise indication type selection while keeping the decision logic manageable through standardized parameter comparisons.
Solution Approach 2:
Different logical channels are assigned different weights based on their importance and QoS requirements. The relay WTRU evaluates the weighted sum of affected channels to determine indication type, allowing differentiated handling of various channel types while maintaining a systematic decision framework.
3Reliability
If the relay WTRU sends second type RLF indications to remote WTRUs, then remote WTRUs can initiate cell reselection and relay re-establishment, but the network stability may be disrupted by frequent reselections
Solution Approach 1:
The system prevents unnecessary cell reselection and relay re-establishment by having the relay WTRU suppress first type RLF indications when the parent relay has already failed (indicated by receiving a second type indication). This preliminary prevention avoids redundant recovery actions that would disrupt network stability while still maintaining reliable connectivity through the parent relay's recovery process.
Data Source
AI summary
Systems, methods, and instrumentalities are described herein related to radio-link failure (RLF) and recovery for multihop and multiconnectivity relays. A wireless transmit/receive unit (WTRU) may act as a relay to another WTRU (e.g., a remote WTRU). For example, a first WTRU may act as a relay WTRU (e.g., a WTRU to network relay) towards a second WTRU (e.g., a remote WTRU). The first WTRU may provide information associated with cell reselection and/or re-establishment to the second WTRU (e.g., if the first WTRU experiences a radio-link failure).