Uplink Control Coding Switch for Multi-Cell HARQ and CSI
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Solution Overview
Problem
There is no specific description in prior art on how to switch between Dual Reed-Muller Coding (DRMC) and Single Reed-Muller Coding (SRMC) schemes when encoding ACK/NACK information and uplink control information, such as Scheduling Request (SR) and Channel State Information (CSI), in LTE-A mobile station apparatuses.
Innovation Solution
A mobile station apparatus that communicates with a base station on multiple serving cells, determines the number of bits for HARQ information based on downlink subframes and transmission modes, applies spatial bundling when necessary, and selects between DRMC and SRMC coding schemes based on the number of bits for HARQ and SR information, either by concatenating and coding bit sequences together or separately coding them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Dual Reed-Muller Coding (DRMC) is used to encode ACK/NACK and uplink control information, then coding reliability is improved, but processing complexity increases
Solution Approach 1:
The patent implements dynamic switching between DRMC and SRMC coding schemes based on the number of bits required for HARQ-ACK information. When the bit count exceeds a threshold, DRMC is selected for enhanced reliability; otherwise, SRMC is used to reduce processing complexity. This dynamic adaptation resolves the contradiction by adjusting the coding scheme according to actual communication needs.
Solution Approach 2:
The patent changes the coding scheme parameter (from DRMC to SRMC or vice versa) based on the information bit length parameter. This parameter-based selection allows the system to optimize between reliability and processing complexity by choosing the appropriate coding scheme for each specific transmission scenario.
2Productivity
If the number of serving cells is increased to provide more communication resources, then system capacity is improved, but the number of bits for HARQ-ACK information increases
Solution Approach 1:
The patent segments the HARQ-ACK information bits into multiple groups when the total bit count is large (exceeding the threshold). Each group is encoded separately using appropriate coding schemes, which manages the complexity of handling large numbers of bits while maintaining system capacity through multi-cell operation.
Solution Approach 2:
The patent introduces a new dimension of coding scheme selection based on bit length thresholds. By adding this dimensional consideration (bit count-based scheme selection), the system can handle increased numbers of bits from multiple serving cells without linearly increasing processing complexity.
3Device complexity
If spatial bundling is applied to reduce the number of HARQ-ACK bits, then processing load is reduced, but information precision is lost
Solution Approach 1:
The patent applies spatial bundling partially - only when the number of HARQ-ACK bits exceeds a specific threshold. This partial application of bundling reduces processing load in high-bit scenarios while preserving full information precision in low-bit scenarios where bundling is not applied, thus resolving the contradiction between processing load and information precision.
Data Source
AI summary
A mobile station apparatus transmits in a subframe, to a base station apparatus, Hybrid Automatic Repeat Request (HARQ) control information and channel state information on the indicated one physical uplink control channel resource, the HARQ control information and the channel state information being transmitted using one of a first processing method of coding and a second processing method of coding, the one of the first processing method of coding and the second processing method of coding being applied on the basis of whether a sum of a number of bits of the HARQ control information and a number of bits of the channel state information exceeds a second predetermined value.