Random Access RLF Logic for Partial Timing Advance Uplink
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Solution Overview
Problem
Existing methods for determining radio link failure (RLF) in wireless communication systems, particularly in scenarios where a signal is used for triggering signaling comprising a Timing Advance (TA) for only part of uplink transmission, lead to impaired service performance and unnecessary RLF triggering.
Innovation Solution
A method for determining RLF that considers the application of a time length to uplink transmission for a cell, where the RLF determination is dependent on whether the time length is applied to the entire or partial uplink transmission, using a counter that increments upon signal transmission, and adjusting actions based on this condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a counter that is increased by 1 after the signal is transmitted reaching an integer is used for determining radio link failure, then the radio link failure determination is simplified, but the service performance is impaired when the TA is used for only part of uplink transmission
Solution Approach 1:
The patent applies different RLF determination rules to different parts of uplink transmission based on whether TA is applied to partial or full uplink transmission. When TA is applied to partial uplink transmission, the counter is not used for RLF determination, while when TA is applied to full uplink transmission, the counter-based method is used. This local differentiation resolves the contradiction by adapting the RLF determination method to the specific transmission scenario.
Solution Approach 2:
The patent dynamically adjusts the RLF determination method based on the TA application scope. The system transitions between different RLF determination approaches (counter-based vs. alternative methods) depending on whether the TA is applied to partial or full uplink transmission, making the RLF determination process adaptive to changing transmission conditions rather than using a fixed approach.
2Ease of operation
If the counter-based RLF determination method is used, then the RLF detection is straightforward, but unnecessary RLF triggering occurs when TA is applied to only part of uplink transmission
Solution Approach 1:
The patent implements local quality by applying different RLF determination strategies to different transmission scenarios. For partial TA application scenarios, the counter-based method is replaced with alternative determination methods that do not trigger unnecessary RLF, while maintaining the simple counter-based approach for full TA application scenarios where it is appropriate.
Solution Approach 2:
The patent segments the uplink transmission into different categories based on TA application scope (partial vs. full). This segmentation allows the system to apply appropriate RLF determination methods to each segment, preventing unnecessary RLF triggering in partial TA scenarios while maintaining effective RLF detection in full TA scenarios.
3Device complexity
If a unified RLF determination method is used for all scenarios, then the system is easier to implement, but it cannot optimize performance for specific scenarios like m-TRP, LTM, V2X, IAB, and NTN
Solution Approach 1:
The patent creates a universal RLF determination framework that can adapt to multiple scenarios (m-TRP, LTM, V2X, IAB, NTN) through a single unified mechanism. The framework uses the TA application scope as a universal criterion to determine which RLF determination method to apply, making the system versatile across different communication scenarios without requiring separate implementations for each scenario.
Solution Approach 2:
The patent implements dynamic adaptability by allowing the RLF determination method to change based on the specific scenario and TA application scope. The system automatically adjusts its behavior for different scenarios (m-TRP, LTM, V2X, IAB, NTN) without requiring manual configuration, achieving scenario-specific optimization through a single dynamic framework.
Data Source
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AI summary
The present application discloses a method and apparatus used in a communication node for wireless communication. The method comprises: the communication node initiating a first random access procedure; in the first random access procedure, transmitting a first signal; monitoring second signaling, wherein the first signal is used for triggering the second signaling, and the second signaling is used for determining a first time length; after the first signal is transmitted, increasing a first counter by 1; and in response to the first counter reaching a target integer, executing a first action set, wherein if the first time length is applied to only part of uplink transmission for a first cell, the first action set does not comprise determining a radio link failure, if the first time length is applied to the uplink transmission for the first cell, the first action set comprises determining the radio link failure, the first cell is an SpCell, and the uplink transmission comprises at least one of PUCCH transmission or PUSCH transmission or SRS transmission.