CRC Generation Using Walsh Allocation and Implicit Terminal ID
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Solution Overview
Problem
In mobile communication systems using time division multiplexing and code division multiplexing, the existing control message format for packet data channels is inefficient, leading to excessive power consumption and reduced transmission efficiency due to the need to broadcast Walsh Code Space Identification information to all terminals, even when only a subset of resources is needed.
Innovation Solution
A modified control message format is introduced, incorporating an additional Walsh Code Allocation field to reduce the number of bits and improve error detection capability, which includes generating error detection codes using control information, a Walsh space indication identifier of another terminal, and a terminal identifier, and adding these codes to the control message for data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Walsh Code Space Identification information is broadcast to all terminals using maximum power, then all terminals can receive the information, but power consumption increases significantly
Solution Approach 1:
The patent applies local quality by differentiating the treatment of information based on the terminal's specific situation. Instead of uniformly broadcasting to all terminals with maximum power, the system provides Walsh Code Space Identification information selectively - only to terminals that need it and can receive it efficiently. This localized approach reduces overall power consumption while maintaining reliability for those who require the information.
Solution Approach 2:
The patent implements partial action by broadcasting Walsh Code Space Identification information only when necessary and only to the extent needed. Rather than continuously broadcasting to all terminals regardless of their needs, the system performs partial broadcasting - only when Walsh code allocation changes occur and only to terminals that require updates. This reduces unnecessary power consumption while maintaining system reliability.
2Quantity of substance
If all available Walsh codes are utilized in PDCH during each time interval, then resource allocation is maximized, but transmission efficiency decreases when only a subset of resources is needed
Solution Approach 1:
The patent applies dynamics by making the Walsh code allocation flexible and adaptive rather than static and fixed. The system dynamically adjusts which Walsh codes are allocated to PDCH based on actual data transmission needs. When only a subset of resources is required, the system allocates only that subset rather than forcing all available Walsh codes into use. This dynamic allocation improves transmission efficiency by matching resource usage to actual demand while maintaining the capability to utilize all resources when needed.
Solution Approach 2:
The patent implements parameter changes by modifying the Walsh code allocation parameters based on system conditions. The system changes the number and identification of Walsh codes allocated to PDCH according to the actual data volume and terminal requirements. This parameter adjustment allows the system to optimize between full resource utilization and transmission efficiency by adapting the allocation parameters to match current operational needs.
3Loss of information
If base station informs all terminals of Walsh code changes by broadcasting WSI on PDCCH, then all terminals receive updated information, but transmission efficiency of the entire system is reduced
Solution Approach 1:
The patent applies the extraction principle by removing the unnecessary broadcasting step from the information delivery process. Instead of extracting and broadcasting WSI information to all terminals through PDCCH, the system extracts only the essential information needed by specific terminals and delivers it directly through PDCH. This eliminates the redundant PDCCH broadcasting step, maintaining complete information delivery to relevant terminals while improving overall system transmission efficiency by avoiding unnecessary transmissions to all terminals.
Solution Approach 2:
The patent implements self-service by enabling terminals to autonomously determine their own Walsh code allocations based on information received through PDCH. Rather than requiring the base station to actively inform all terminals of changes through PDCCH broadcasting, terminals independently acquire the necessary Walsh code space identification information from their allocated PDCH resources. This self-service approach maintains information delivery completeness while eliminating the efficiency-costly broadcasting mechanism.
Data Source
AI summary
In a mobile communication system, an error detection code or a quality frame indicator (e.g., CRC) is generated using selectively frame information, and at least one of a WCA identifier of another terminal, and a corresponding terminal identifier. And the terminal identifier can be implicitly transmitted to the receiver.