Uplink Reed-Muller Encoding for CSI and ACK Collision Handling
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Solution Overview
Problem
In LTE and future mobile communication standards, the simultaneous transmission of channel state information (CSI) and acknowledgement information often collides, leading to incorrect decoding of CSI due to higher error rate requirements, resulting in suboptimal system performance.
Innovation Solution
A communication device and method that employs a demultiplexing circuit to separate information bits, a vector selection circuit to choose appropriate code vectors, and a Reed-Muller encoding circuit to encode different types of information bits based on their error rate requirements, optimizing the encoding process for CSI and acknowledgement information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If simultaneous transmission of multi-carrier acknowledgement information and multi-carrier CSI is supported using PUCCH format 3 packets, then the system can transmit both types of information together, but the decoding accuracy deteriorates due to different error rate requirements causing collision between the two information types
Solution Approach 1:
The patent segments the information bits into two separate groups: first group containing n11 bits of acknowledgement information and n12 bits of CSI, second group containing n21 bits of acknowledgement information and n22 bits of CSI. Each group is independently encoded with appropriate code vectors, allowing different error rate protections for different information types while maintaining simultaneous transmission capability.
Solution Approach 2:
The patent applies different encoding qualities to different parts of the information. By selecting and permuting code vectors specifically for each group based on their error rate requirements, the system provides locally optimized protection - higher protection for acknowledgement information and appropriate protection for CSI, rather than applying uniform encoding to all information.
2Device complexity
If uniform encoding is applied to all information bits, then the encoding process is simple, but the system cannot meet different error rate requirements for different information types leading to suboptimal performance
Solution Approach 1:
The encoding process is segmented into distinct stages: demultiplexing information into groups, selecting code vectors for each group, permuting code vectors according to specific rules, and independent encoding of each group. This segmented approach increases reliability by allowing differentiated error protection while keeping each encoding stage relatively simple and manageable.
Solution Approach 2:
The patent changes the encoding parameters dynamically based on information type. By selecting different code vectors and applying different permutation rules to different groups of information bits, the system adapts the encoding parameters to match the specific error rate requirements of each information type, thereby improving overall reliability without excessive complexity.
3Reliability
If CSI is dropped when colliding with acknowledgement information, then the transmission conflict is resolved, but the network cannot timely receive CSI for adjusting communication parameters affecting system performance
Solution Approach 1:
The patent merges the transmission of acknowledgement information and CSI into a single simultaneous transmission using PUCCH format 3 packets. By combining both information types in the same transmission resource and using group-based encoding with differentiated error protection, the system ensures both information types are transmitted together without dropping CSI, thereby maintaining both transmission reliability and system performance.
Data Source
AI summary
A communication device for uplink transmission with a first type of information and a second type of information includes a demultiplexing circuit, a vector selection circuit, a permutation circuit and a Reed-Muller encoding circuit. The demultiplexing circuit generates a first group of information bits and a second group of information bits according to the first type of information and the second type of information. The vector selection circuit selects code vectors from a predetermined vector set for the first group of information bits and the second group of information bits. The permutation circuit permutes the code vectors according to the first group of information bits and according to the second group of information bits. The Reed-Muller encoding circuit encodes the first group of information bits and the second group of information bits with the permuted code vectors for providing different levels of protection.