Random Access Failure Reporting for Adaptive BWP and UL LBT Recovery
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Solution Overview
Problem
Existing communication systems face inefficiencies in data transmission due to consistent uplink listen before talk (LBT) failures, which are not effectively addressed by current bandwidth part (BWP) and random access configurations, leading to increased latency and reduced data transmission efficiency.
Innovation Solution
A communication method and system that enables a terminal device to report random access failure information to a network device, allowing for optimization of random access, uplink LBT failure, and BWP configurations, thereby reducing latency and preventing consistent LBT failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device performs random access on all BWPs having PRACH resources, then the random access coverage is improved, but the latency in consistent UL LBT failure recovery increases
Solution Approach 1:
The patent segments the random access process by identifying specific BWPs with PRACH resources rather than attempting random access on all BWPs. The network device configures the terminal with a subset of suitable BWPs for random access, dividing the overall access space into manageable segments that reduce search time and recovery latency while maintaining adequate coverage.
Solution Approach 2:
The network device performs preliminary configuration by pre-identifying and configuring appropriate BWPs with PRACH resources before the terminal needs to perform random access. This preliminary action of selecting and configuring optimal BWPs in advance reduces the time required during actual random access operations and LBT failure recovery scenarios.
2Speed
If the counter reaches a maximum preset quantity quickly, then the consistent UL LBT failure detection speed is improved, but the false detection rate increases
Solution Approach 1:
The patent implements dynamic adjustment of the counter threshold based on detection outcomes. When a consistent UL LBT failure is detected, the network device can adjust the maximum preset quantity of the counter adaptively. This dynamic mechanism allows the system to maintain high detection speed while reducing false detections by learning from past detection results and adjusting sensitivity accordingly.
Solution Approach 2:
The system incorporates feedback mechanisms where detection results are fed back to adjust future detection parameters. The network device uses feedback from random access outcomes and LBT failure patterns to optimize the counter threshold, ensuring that the detection speed remains high while false detection rates are minimized through continuous parameter optimization.
3Reliability
If the BWP switching process is performed frequently, then the random access success rate is improved, but the data transmission efficiency deteriorates
Solution Approach 1:
The network device performs preliminary configuration of multiple BWPs with PRACH resources in advance, so that when random access is needed, the terminal can quickly switch to a pre-configured suitable BWP without extensive searching. This preliminary preparation improves random access success rate while minimizing the frequency and duration of BWP switching operations, thereby preserving data transmission efficiency.
Solution Approach 2:
The system changes BWP parameters (such as bandwidth, subcarrier spacing, or cyclic prefix length) based on channel conditions and access requirements. By dynamically adjusting BWP parameters rather than frequently switching between fixed BWPs, the system improves random access success under varying conditions while reducing the overhead and efficiency loss associated with frequent switching.
Data Source
AI summary
A communication method includes obtaining first information, and sending the first information to a network device. The first information includes information of a random access failure that occurs in response to a terminal device performing random access. The first information is useable to update at least one or more of a random access configuration, an uplink listen before talk (LBT) failure configuration, or a bandwidth part (BWP) configuration.