Wireless Base Station Random Access Timing Grouping
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Solution Overview
Problem
Mobile station apparatuses face a burden when executing random access procedures for uplink component carriers with different transmission timings, requiring excessive wireless resources to transmit timing information across multiple cells.
Innovation Solution
Transmitting one piece of transmission timing information per transmission timing group, allowing the mobile station apparatus to adjust uplink transmission timings efficiently without needing excessive wireless resources for timing information across all cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the mobile station apparatus executes random access procedures for all uplink component carriers to obtain transmission timing information, then the transmission timing accuracy is improved, but the device complexity and resource consumption increase
Solution Approach 1:
The patent divides component carriers into different timing adjustment groups based on their timing relationships. Cells with identical timing offsets form one group, while cells with different timing offsets form separate groups. This segmentation allows the mobile station to perform random access procedures only for representative cells in each group rather than all cells, reducing complexity while maintaining timing accuracy for all component carriers
Solution Approach 2:
The patent establishes that one piece of timing adjustment information can serve multiple component carriers within the same timing group. By making the timing adjustment information applicable universally across grouped cells, the system reduces the number of random access procedures needed while ensuring accurate timing synchronization for all uplink transmissions across multiple component carriers
2Loss of information
If transmission timing information is transmitted for each cell individually, then the timing information completeness is improved, but the wireless resource consumption increases
Solution Approach 1:
The patent merges timing adjustment information for multiple cells into a single unified timing adjustment group. By combining cells with identical timing offsets into one group and transmitting a single timing adjustment value for the entire group, the system reduces wireless resource consumption for timing information transmission while maintaining complete timing information for all component carriers through the grouping relationship
Data Source
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AI summary
A mobile station apparatus performs an efficient random access procedure. A base station apparatus includes all parameters of random access information in setting information regarding at least one of a plurality of cells and part of the parameters of the random access information in setting information regarding at least one of the plurality of cells and transmits the setting information to the mobile station apparatus. The mobile station apparatus executes the random access procedure for the cells for which the random access information is included in the transmitted setting information.