PRACH RO Set Determination for Clear SSB Mapping
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Solution Overview
Problem
The existing communication systems face poor performance in PRACH transmission with repetitions due to unclear determination of RO sets resulting from varying SSB-RO association based on different parameter values, leading to preamble collisions and inefficient random access procedures.
Innovation Solution
A method and apparatus for determining ROs or RO sets used for PRACH transmission based on associations with synchronization signal blocks (SSBs) or PRACH resource configurations, clarifying the mapping between SSBs and ROs to ensure clear RO sets for PRACH repetitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different parameter values are used for SSB-RO association configuration, then the system can adapt to different network conditions, but the RO determination becomes unclear leading to preamble collisions
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting SSB-RO association parameters (such as msg1-FDM, msg1-TimeFDM, and ssb-perRACH-OccasionAndCB-PreamblesPerSSB) based on network conditions. The network device configures different parameter sets that define how synchronization signal blocks map to random access channel occasions, allowing the system to adapt to varying traffic loads and channel conditions while maintaining clear RO determination through standardized mapping rules.
Solution Approach 2:
The patent segments the random access procedure by dividing ROs into distinct sets associated with different SSBs. Each SSB-RO association configuration creates separate mapping relationships, allowing the system to handle different network conditions through segmented parameter sets. This segmentation prevents confusion by ensuring each SSB has clearly defined associated ROs according to the configured parameters.
2Adaptability or versatility
If SSB-RO association is configured with multiple parameter options, then network flexibility is improved, but random access efficiency decreases due to preamble collisions
Solution Approach 1:
The patent resolves this contradiction by enabling dynamic parameter changes based on network conditions. The network device can configure different SSB-RO association parameter sets (such as adjusting msg1-FDM values or ssb-perRACH-OccasionAndCB-PreamblesPerSSB ratios) to optimize for either flexibility or efficiency depending on the scenario. This parameter adaptability allows the system to maintain high random access efficiency by preventing preamble collisions through appropriate parameter selection.
3Adaptability or versatility
If RO sets are not clearly determined, then configuration flexibility is maintained, but PRACH transmission performance deteriorates
Solution Approach 1:
The patent applies preliminary action by having the network device pre-configure SSB-RO association parameters before the terminal performs random access. The terminal uses these pre-configured parameters to determine RO sets in advance according to standardized mapping rules (such as Formula 1 for calculating RO indices). This preliminary configuration ensures clear RO determination while maintaining configuration flexibility, as the parameters can be adjusted for different scenarios but are established beforehand to guide terminal behavior.
Data Source
AI summary
This application pertains to the field of communication technologies, and discloses an RO determining method and apparatus, a terminal, and a storage medium. The RO determining method in embodiments of this application includes: determining, by a terminal based on ROs or RO sets respectively associated with at least one SSB or based on a PRACH resource configuration, ROs or RO sets used for PRACH transmission.