Communication Node Timer Coordination for Wireless Link Recovery
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Solution Overview
Problem
Current 3GPP protocols for wireless communication systems, particularly in Non-Terrestrial Networks (NTNs), face issues with timer management, leading to increased transmission delay, unnecessary signaling overhead, and delayed link recovery due to the lack of collaborative design between delay-sensitive and delay-insensitive timers, resulting in frequent Radio Link Failures (RLFs) and inefficient resource utilization.
Innovation Solution
A method is introduced where a first timer is started upon detecting a physical-layer problem in a serving cell, and a second timer is initiated to manage radio connection recovery, with the first timer being stopped when the second timer is running, thereby avoiding interference and optimizing link recovery procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If timer T310 and timer T316 are not designed collaboratively, then the existing protocol can be implemented, but transmission delay increases and link recovery is delayed
Solution Approach 1:
The patent merges the management of timer T310 and timer T316 by introducing a collaborative mechanism where the expiration of T310 can trigger stopping of T316, and the start of T316 can trigger stopping of T310. This integration resolves the technical contradiction by coordinating the two timers to work together rather than independently, thereby reducing transmission delay and improving link recovery efficiency without significantly increasing system complexity.
2Reliability
If timer T310 continues running while timer T316 is running, then both timers can perform their functions, but unnecessary signaling overhead is generated
Solution Approach 1:
The patent extracts the conflict between simultaneous timer operations by implementing a stopping mechanism: when T316 is started, T310 is stopped, and vice versa. This extraction principle eliminates the unnecessary signaling overhead generated by both timers running simultaneously while maintaining the reliability of link recovery procedures through coordinated timer management.
3Speed
If fast MCG link recovery is performed, then link recovery speed is improved, but timer coordination problems cause recovery failure
Solution Approach 1:
The patent applies preliminary action by establishing timer coordination rules before fast MCG link recovery is initiated. The mechanism pre-defines that when T316 is started for fast recovery, T310 should be stopped to prevent conflicting actions. This preliminary coordination ensures that the fast recovery procedure executes successfully without timer-related failures, thereby maintaining both high speed and high reliability.
Data Source
AI summary
Method and device in a communication node for wireless communications. A communication node determines that a physical-layer problem occurs in a first serving cell; as a response to determining that the physical-layer problem occurs in the first serving cell, starts a first timer; determines that a first condition set is satisfied; as a response to the first condition set being satisfied, transmits a first signaling; as a response to the first condition set being satisfied, starts a second timer and stops the first timer; when the second timer is in a running state, monitors a second signaling; the first condition set comprises that an RLF occurs in the first serving cell and the second timer is configured; the second timer is associated with the first serving cell; the first signaling is used to initiate a radio connection recovery; and the second signaling is used to update a radio connection.