LTE Mobile Station HARQ Coding Switch for ACK/NACK and SR
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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 determines the number of bits for HARQ information based on downlink subframes, applies spatial bundling when necessary, and selects between DRMC and SRMC coding schemes based on the number of bits for HARQ and SR information, using either concatenation or separate coding of bit sequences for efficient encoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of bits for HARQ information increases due to more downlink subframes or serving cells, then more ACK/NACK information can be transmitted, but the coding scheme selection becomes more complex and ambiguous
Solution Approach 1:
The patent applies parameter changes by dynamically selecting between DRMC and SRMC coding schemes based on the number of bits for HARQ information. When the bit count exceeds a predetermined threshold, SRMC is selected; otherwise, DRMC is used. This parameter-based selection resolves the complexity by providing clear decision criteria.
Solution Approach 2:
The coding scheme is made dynamic rather than fixed, allowing the system to adapt between DRMC and SRMC based on real-time conditions (number of HARQ bits). This dynamic adaptation eliminates ambiguity in coding scheme selection while handling variable quantities of HARQ information.
2Productivity
If spatial bundling is applied to reduce the number of bits, then transmission efficiency improves, but the processing complexity increases due to additional bundling operations
Solution Approach 1:
Spatial bundling is applied conditionally based on the number of bits for HARQ information. When the bit count exceeds the threshold, spatial bundling is performed to reduce bits before encoding. This parameter-driven approach optimizes transmission efficiency while managing processing complexity through selective application.
3Adaptability or versatility
If both ACK/NACK information and uplink control information are encoded together, then resource utilization improves, but the coding scheme selection becomes more ambiguous
Solution Approach 1:
The patent resolves coding scheme selection ambiguity by using the number of bits for HARQ information as the primary decision parameter. Whether encoding ACK/NACK alone or combined with uplink control information, the same bit-count-based criteria determine whether to use DRMC or SRMC, providing consistent and unambiguous selection rules.
Data Source
AI summary
A mobile station apparatus efficiently switches coding schemes when coding both information indicating an ACK/NACK and first control information. A mobile station apparatus 200 determines a number of bits of information on a HARQ based on a number of downlink subframes corresponding to the information on a HARQ transmitted in a certain uplink subframe, a number of set serving cells, and a transmission mode set in each serving cell, applies spatial bundling to the information on a HARQ in a case where the determined number of bits of the information on a HARQ exceeds a predetermined value, and selects one of a first coding scheme and a second coding scheme based on the number of bits of the information on a HARQ to which spatial bundling has been applied and a number of bits of a scheduling request and codes both the information on a HARQ and the scheduling request.