MsgA PRACH Repetition Mapping Ratio Optimization
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Solution Overview
Problem
Existing wireless communication technologies face challenges in efficiently implementing time domain repetition for MsgA transmission, particularly in 2-step random access channel (RACH) procedures, due to issues like prolonged time delays and mismatched repetition numbers for preambles and physical uplink shared channel (PUSCH) resource units (PRUs).
Innovation Solution
The proposed solution involves a method that includes receiving signaling information about the total number of preambles and PRUs in a period, determining a mapping ratio of preambles to PRUs, and associating indices of synchronization signal blocks (SSBs) with preambles and PRUs using specific group sizes and repetition numbers. This approach optimizes the use of available resources by dividing SSBs into groups based on predetermined sizes for preambles and PRUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time domain repetition is adopted for MsgA transmission to increase received power, then uplink coverage recovery is improved, but time delay increases when multiple RACH occasions and PRU time instances are located in discrete time instances
Solution Approach 1:
The patent divides SSBs into multiple groups and associates different groups with different time instances, allowing repetition transmissions to occur in organized segments across multiple occasions rather than requiring all repetitions to be contiguous, thus reducing time delay while maintaining coverage recovery
Solution Approach 2:
The patent introduces dynamic parameters including preamble repetition number, PRU repetition number, and SSB group size that can be configured based on channel conditions and coverage requirements, allowing the system to adaptively balance between repetition effectiveness and time delay
2Adaptability or versatility
If preamble repetition number and PRU repetition number are set independently, then resource utilization flexibility is improved, but resource allocation complexity increases
Solution Approach 1:
The patent applies different repetition numbers and SSB group sizes to different resource types (preamble vs. PRU) and different SSB groups, allowing localized optimization of resource allocation based on specific channel conditions and requirements for each resource type
Solution Approach 2:
The patent establishes predetermined association rules between SSB groups, preambles, and PRUs that are configured in advance through signaling, allowing the system to prepare resource allocations beforehand and reduce real-time allocation complexity during actual transmission
3Reliability
If multiple SSBs are associated with multiple preambles and PRUs through time domain repetition, then MsgA transmission reliability is improved, but full utilization of available preambles and PRU resources becomes difficult
Solution Approach 1:
The patent creates a universal mapping framework where SSB groups can be associated with multiple preambles and PRUs across different time instances, allowing the same SSB group to utilize multiple resource types and time occasions, thereby achieving both reliability through repetition and full resource utilization
Solution Approach 2:
The patent ensures continuous utilization of available preambles and PRU resources by systematically associating SSB groups with resources across multiple time instances, preventing resource idle time and maintaining continuous useful transmission actions throughout the period
Data Source
AI summary
Embodiments of the present application are related to a method and apparatus for physical random access channel (PRACH) repetitions. A method according to an embodiment of the present application includes: receiving signaling information indicating at least one of a total number of a set of preambles in a period, a total number of a set of physical uplink shared channel (PUSCH) resource units (PRUs) in the period, a preamble repetition number in the period and a PRU repetition number in the period; and determining a mapping ratio of preambles to PRUs in the period based on the received signaling information.