PRACH RO Bundling for Coherent Preamble Detection
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Solution Overview
Problem
Existing methods for improving preamble detection performance in wireless communication systems by frequency hopping result in poor coherent combination effects and deteriorated detection performance due to varying channels and phase jumps across different ROs in an RO group.
Innovation Solution
A method that combines frequency hopping with coherent detection by grouping ROs into bundles, ensuring that preambles in the same bundle experience similar channels and phase jumps, allowing for coherent combination before frequency hopping across different bundles to improve detection success probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frequency hopping is performed across multiple ROs in an RO group, then frequency diversity gain is obtained and the probability of all channels being in deep fading is reduced, but preambles on different ROs experience different channels and phase jumps resulting in poor coherent combination effects and deteriorated coherent detection performance
Solution Approach 1:
The patent segments the RO group into multiple RO bundles, where each bundle contains multiple ROs. Frequency hopping is performed at the bundle level rather than individual RO level. This segmentation allows preambles within each bundle to experience similar channel conditions for coherent combination, while different bundles experience different channels for frequency diversity.
Solution Approach 2:
The patent introduces RO bundles as an intermediary layer between individual ROs and the frequency hopping mechanism. This intermediary structure enables coherent combination within bundles while maintaining frequency diversity across bundles, effectively mediating between the requirements for coherent detection and frequency diversity.
2Productivity
If preambles are sent repeatedly on multiple ROs in frequency hopping manner, then the probability that network device receives preamble is improved, but preambles on different ROs experience different channels resulting in poor coherent combination effects
Solution Approach 1:
The patent segments repeated preamble transmissions into bundles, where each bundle contains multiple ROs. This segmentation enables coherent combination within each bundle while maintaining frequency hopping between bundles, thus improving transmission efficiency without sacrificing coherent combination quality.
Solution Approach 2:
The patent implements periodic frequency hopping at the bundle level, where preambles are transmitted periodically across different bundles. This periodic action maintains frequency diversity while ensuring that transmissions within each period (bundle) experience similar channel conditions for coherent combination.
Data Source
AI summary
A transmission method and a communication apparatus are provided. The transmission method includes: receiving an SSB and PRACH resource configuration information; determining time-frequency positions of a plurality of ROs in an RO bundle based on the SSB and the PRACH resource configuration information, wherein the RO bundle comprises a plurality of ROs in time domain, the plurality of ROs in the RO bundle correspond to different time domain positions, and the plurality of ROs in the RO bundle correspond to a same frequency position; and sending a preamble separately on the plurality of ROs in the RO bundle based on the time-frequency positions of the plurality of ROs in the RO bundle.