NR Random Access Resource Set Rollback for MSG1 Repetition
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Solution Overview
Problem
The random access process in NR communication systems faces challenges due to the introduction of MSG3 repetition and other features like SDT and RedCap, necessitating a comprehensive approach for MSG1 repetition count rollback to ensure successful access.
Innovation Solution
A resource set selection method that considers MSG1 repetition count and other features, allowing for rollback based on specific scenarios, prioritizing resource sets associated with higher repetition counts when transmission fails, to improve access success rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MSG1 repetition count is increased to improve random access success rate, then access reliability improves, but system complexity increases due to multiple features (MSG3 repetition, SDT, RedCap) that must be comprehensively considered
Solution Approach 1:
The patent segments the random access resource sets by different features (MSG1 repetition, MSG3 repetition, SDT, RedCap) into distinct categories. Each resource set is associated with specific feature combinations, allowing the system to handle multiple features through structured segmentation rather than monolithic complexity management.
Solution Approach 2:
The patent implements dynamic feature priority adjustment based on current random access status. When random access fails, the system dynamically changes the priority of features (e.g., switching from MSG1 repetition priority to MSG3 repetition priority) to adapt to different scenarios, making the system flexible rather than static.
2Reliability
If MSG1 repetition count is rolled back to high repetition count to improve success rate, then access reliability improves, but transmission time increases
Solution Approach 1:
The patent dynamically adjusts the MSG1 repetition count based on real-time random access success status. When failures occur, the system rolls back to higher repetition counts; when successful, it maintains lower counts. This dynamic adaptation optimizes the balance between reliability and transmission time rather than using a fixed repetition count.
Solution Approach 2:
The patent changes the repetition count parameter adaptively based on feature priorities and access outcomes. The system modifies the MSG1 repetition parameter (changing it from static to dynamic) according to the current feature combination and access success rate, achieving optimal performance under varying conditions.
3Reliability
If resource set selection considers all random access features comprehensively, then access reliability improves, but decision complexity increases
Solution Approach 1:
The patent segments features into priority levels and associates resource sets with specific feature combinations. This segmentation allows the system to consider multiple features systematically by evaluating them in priority order rather than simultaneously, reducing decision complexity while maintaining comprehensive consideration.
Solution Approach 2:
The patent pre-establishes feature priority relationships and resource set associations before random access occurs. By determining feature priorities in advance and pre-linking resource sets to feature combinations, the system reduces real-time decision complexity while ensuring comprehensive feature consideration during access.
Data Source
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AI summary
Embodiments of this application provide a resource set selection method and a communication apparatus, and relate to the communication field. The method and the apparatus are applicable to a random access process in NR, in which different resource set selection policies can be executed based on different scenarios, thereby facilitating normal implementation of random access in each scenario. The method includes: when a MSG1 transmission count is greater than a first threshold, determining, based on a current MSG1 repetition count, whether to roll back the current MSG1 repetition count; or when the MSG1 transmission count is greater than the first threshold, determining, based on the current MSG1 repetition count and a feature other than the MSG1 repetition count, whether to roll back the current MSG1 repetition count; and when it is determined to roll back the current MSG1 repetition count, selecting a resource set based on the post-rollback MSG1 repetition count and a feature other than the MSG1 repetition count in current random access features.