Control Channel Polar Coding Across Multiple TCI States
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently encoding and decoding control channel transmissions across multiple transmission configuration indication (TCI) states due to varying resource elements, which complicates the encoding and decoding processes.
Innovation Solution
The use of a common mother code for encoding control information across different TCI states, with parameters such as block code length and number of information bits being common, and rate matching procedures differing based on available coded bits, enables efficient transmission and decoding of control channel resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate encoding parameters are used for each TCI state, then the encoding can be optimized for each specific resource configuration, but the device complexity and processing overhead increase significantly
Solution Approach 1:
The patent applies universality by using a common mother code that can serve multiple TCI states simultaneously. The base encoder is configured with a single mother code that is then rate-matched to different resource configurations, allowing one encoder to handle multiple transmission scenarios without requiring separate encoders for each TCI state.
Solution Approach 2:
The patent segments the encoding process into two distinct stages: first, a common mother code is used to generate the base codeword, and then rate matching is applied separately to adapt the codeword to different resource configurations. This segmentation allows the complex adaptation to be handled in a standardized second stage rather than requiring different encoders.
2Productivity
If rate matching is performed for each TCI state individually, then the resource utilization is optimized, but the processing time and latency increase
Solution Approach 1:
The patent applies preliminary action by performing the mother code encoding once before rate matching. The base codeword is generated in advance using the common mother code, and then rate matching is applied to adapt it to different resource configurations. This preliminary encoding step reduces the overall processing time compared to performing full encoding separately for each TCI state.
3Measurement precision
If different mother codes are used for different TCI states, then the decoding can be optimized for each resource configuration, but the decoder complexity and computational overhead increase
Solution Approach 1:
The patent applies universality in decoding by using a single mother code that the decoder can use to decode transmissions across multiple TCI states. The decoder is configured with the same mother code parameters as the encoder, allowing it to successfully decode control information regardless of which TCI state was used, as long as the rate matching parameters are known.
4Device complexity
If a common mother code is used across multiple TCI states, then the device complexity is reduced, but the adaptability to different resource configurations may be limited
Solution Approach 1:
The patent applies dynamics by making the rate matching parameters adaptive to different TCI states while keeping the mother code fixed. The system dynamically adjusts the rate matching configuration based on the available resources for each TCI state, allowing the common mother code to effectively serve different resource configurations through flexible rate matching rather than requiring different mother codes.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. An encoder may utilize a common mother code for encoding control information to each set of control channel resources of a control channel, control channel associated with multiple transmission configuration indication (TCI) states. For example, the common mother code may include utilizing same parameters when constructing the polar code for each set of control channel resources, where the parameters include a block length, a number of information bits, or both. Additionally, rate matching procedures for each control channel resource may differ (e.g., puncturing, shortening, or repetition). Additionally or alternatively, the mother code and rate matching may be determined based on a sum of all available coded bits in each control channel resource and the number of information bits. A decoder may then attempt soft combination of candidates from the different sets of control channel resources to obtain decoded control information.