SSB-RO Mapping Periods for PRACH Repetition Access
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Solution Overview
Problem
In contention-based random access scenarios, determining an SSB-RO group association pattern period for PRACH repetition sending is complex and prone to failure due to beam propagation losses, especially when the terminal device is far away from the access network device or in unfavorable environments.
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 ROs at different time domain positions and associated with the same SSB, using specific time period calculations based on SSB and PRACH configuration periods to reduce implementation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH repetition sending is implemented to increase uplink coverage capability, then reliability is improved, but device complexity increases due to the need to determine SSB-RO group association pattern period
Solution Approach 1:
The patent changes the parameter of time period definition by introducing a first time period that is an integer multiple of both the SSB configuration period and the PRACH configuration period. This parameter change ensures that the mapping relationship between SSBs and RO groups remains consistent across multiple time periods, enabling PRACH repetition sending while maintaining manageable system complexity through standardized periodicity.
Solution Approach 2:
The patent segments the time domain by dividing it into multiple first time periods, where each first time period is an integer multiple of the SSB configuration period and PRACH configuration period. This segmentation allows the system to handle PRACH repetition sending in a structured manner, with each segment maintaining consistent SSB-RO group mapping relationships, thereby reducing overall implementation complexity.
2Reliability
If the mapping relationship between SSBs and ROs is made consistent across multiple time periods for PRACH repetition, then reliability is improved, but the number of invalid ROs increases
Solution Approach 1:
The patent introduces dynamics by allowing the system to adaptively determine the first time period based on the SSB configuration period and PRACH configuration period. The first time period is defined as an integer multiple of both periods, enabling the system to dynamically adjust the timing structure to ensure consistent SSB-RO group mapping while minimizing the impact on available RO resources through optimized periodicity selection.
Data Source
AI summary
A communication method includes receiving a system information block (SIB1) from an access network device. The SIB1 includes synchronization signal block (SSB) configuration information and physical random access channel (PRACH) configuration information. The SSB configuration information indicates a quantity N of configured SSBs and an SSB configuration period. The PRACH configuration information indicates a PRACH configuration period. The method also includes determining a first time period based on the SSB configuration period and/or the PRACH configuration period. There is a mapping relationship between the N SSBs and M random access channel occasion (RO) groups in the first time period. The M RO groups appear at least once, the M RO groups include an RO group corresponding to each of the N SSBs and each of L PRACH repetition quantities. Mapping between the N SSBs and the M RO groups is the same in each of K consecutive first time periods.