Uplink Control Information Encoding via Reed-Muller Segmentation
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Solution Overview
Problem
The increasing amount of uplink control information in wireless communication systems, particularly in 3GPP LTE, poses challenges due to restrictive radio resources and higher transmission errors, necessitating an efficient coding and modulation scheme for reliable transmission.
Innovation Solution
The method involves determining the number of Reed-Muller encoders based on the number of bits in the uplink control information, generating sub-sequences, and using these encoders to produce coded sequences that are then mapped into modulation symbols for transmission, with the option to adjust the modulation scheme and prioritize bits like HARQ ACK/NACK and CSI, ensuring efficient use of the uplink channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of uplink control information is increased to support MIMO and carrier aggregation, then channel capacity is improved, but transmission error rate increases and radio resources become more restrictive
Solution Approach 1:
The patent divides the uplink control information bit sequence into multiple sub-sequences, with each sub-sequence being encoded by a separate Reed-Muller encoder. This segmentation allows the system to handle increased control information volume while maintaining reliable transmission through distributed encoding across multiple code blocks.
Solution Approach 2:
The patent changes the coding parameters by using Reed-Muller codes with adjustable block lengths (e.g., (32, O) codes where O varies from 2 to 22 bits). By adapting the code parameters to match the actual control information size, the system achieves optimal error correction performance for different amounts of control information while maintaining transmission reliability.
2Quantity of substance
If multiple Reed-Muller encoders are used to handle increased control information, then coding capacity is improved, but system complexity increases
Solution Approach 1:
The patent segments the control information into multiple sub-sequences that can be processed by multiple Reed-Muller encoders in parallel. This segmentation approach increases coding capacity to handle larger control information volumes while keeping each individual encoder's complexity manageable through standardized code structures.
Solution Approach 2:
The patent employs Reed-Muller codes as a universal coding scheme that can handle various control information sizes (from 2 to 22 bits) by adjusting the code parameters. This multi-functional approach allows the same encoder family to serve multiple coding capacity requirements without requiring entirely different encoding systems.
3Loss of information
If different types of control information are transmitted simultaneously, then information completeness is improved, but error priority management becomes more difficult
Solution Approach 1:
The patent applies different coding priorities to different types of control information by mapping HARQ ACK/NACK bits to specific positions in the coded sequence with higher protection, while CSI bits receive appropriate but differentiated protection levels. This local quality approach ensures that critical information like HARQ feedback receives enhanced error protection while maintaining overall information completeness.
Solution Approach 2:
The patent segments different types of control information (HARQ ACK/NACK, CSI, scheduling requests) into separate bit sequences that are independently encoded and then multiplexed. This segmentation enables differentiated error protection strategies for each information type while maintaining the completeness of the overall control information transmission.
Data Source
AI summary
Provided is a method and an apparatus for transmitting uplink control information in a wireless communication system. A wireless device determines the number of a plurality of Reed-Muller (RM) encoders based on the number of bits of a bit sequence indicating uplink control information, and divides the bit sequence based on the determined number of the plurality of RM encoders to generate a plurality of sub-sequences. The wireless device inputs the plurality of sub-sequences into the respective plurality of RM encoders to generate a coded sequence, maps the coded sequence according to a modulation method to generate a plurality of modulated symbols, and transmits the plurality of modulated symbols on an uplink channel.