SSB-RO Group Mapping Period for PRACH Repetition Access
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Solution Overview
Problem
The challenge of determining an SSB-RO group association pattern period in a PRACH repetition sending scenario is critical to enhance uplink coverage, as beam propagation issues and unfavorable environments can lead to unreliable network access.
Innovation Solution
A method to determine an SSB-RO group association pattern period by mapping N SSBs to M RO groups, ensuring consistent mapping across K consecutive time periods, with specific time period determination based on SSB and PRACH configuration periods, and optimizing RO group patterns to reduce implementation complexity and improve resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH repetition sending is performed to increase uplink coverage capability, then network access reliability is improved, but the complexity of determining SSB-RO group association pattern period increases
Solution Approach 1:
The patent changes the parameter of time period determination by defining the first time period as the shortest duration satisfying specific mapping conditions, and establishing relationships between the first time period, SSB configuration period, and PRACH configuration period through integer multiples. This parameterization approach simplifies the determination process while ensuring reliable network access through PRACH repetition sending.
Solution Approach 2:
The patent segments the SSB-RO association into groups by introducing RO groups where multiple ROs are associated with the same SSB. By defining mapping between SSBs and RO groups rather than individual SSB-RO mappings, the system reduces complexity in determining association patterns while maintaining reliable access through repeated transmissions across multiple ROs within each group.
2Length of stationary object
If mapping between SSBs and ROs is performed frequently to ensure coverage, then uplink coverage capability is improved, but implementation complexity increases
Solution Approach 1:
The patent implements periodic action by defining the first time period as a recurring interval where SSB-RO group mapping is performed. The mapping relationship remains consistent across K consecutive first time periods, creating a periodic pattern that ensures adequate coverage while reducing implementation complexity through repetition of established mappings rather than continuous reconfiguration.
Solution Approach 2:
The patent creates universal RO groups that can serve multiple SSBs, where one RO group includes at least two ROs all associated with the same SSB. This multi-functional RO group structure allows the same grouping pattern to be reused across different time periods and SSB configurations, reducing implementation complexity while maintaining comprehensive coverage.
Data Source
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AI summary
A communication method and a related apparatus are provided. In the method, an SSB-RO group association pattern period (namely, a first time period) in a PRACH repetition sending scenario is defined. To be specific, the first time period is shortest duration in all duration that satisfies that mapping between N SSBs and M RO groups is performed at least once and that the mapping between the N SSBs and the M RO groups is the same in each of K consecutive first time periods. The first time period may be determined based on an SSB configuration period and/or a PRACH configuration period. The method in this application helps reduce implementation complexity.