PDCCH Mapping Across Multiple TCI States With Common Polar Coding
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Solution Overview
Problem
Current wireless communication systems face challenges in mapping a Physical Downlink Control Channel (PDCCH) across multiple transmission configuration indication (TCI) states, leading to potential issues in detectability and decoding due to different polar codes being used for each TCI part, which can result in reduced flexibility and reliability.
Innovation Solution
The solution involves encoding the PDCCH using a common mother polar code for each set of control channel elements (CCEs) mapped to different TCI states, allowing for soft combining across TCI states and ensuring each TCI part is self-decodable, even if one part is blocked.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different polar codes are used for each TCI part of PDCCH, then each TCI part can be independently decoded, but the detectability and reliability of PDCCH is reduced
Solution Approach 1:
The patent merges the coding process by using a common mother polar code for encoding PDCCH across multiple TCI states. This combining approach improves detectability and reliability while maintaining that each TCI part remains self-decodable through proper code design
2Adaptability or versatility
If PDCCH is mapped across multiple TCI states, then flexibility and coverage are improved, but the complexity of encoding and decoding increases
Solution Approach 1:
The patent applies universality by using a single common mother polar code that serves multiple TCI states simultaneously. This universal coding approach maintains mapping flexibility across different TCI states while reducing encoding and decoding complexity compared to using separate codes for each state
3Reliability
If a common mother polar code is used for encoding PDCCH across multiple TCI states, then detectability and reliability are enhanced, but the code design becomes more constrained
Solution Approach 1:
The patent applies local quality by ensuring that while a common mother polar code is used for encoding, each TCI part is designed to be self-decodable. This allows the system to maintain decoding reliability through the common code while adapting locally to ensure each TCI state can be independently decoded if needed
Data Source
AI summary
Aspects of the disclosure relate to mechanisms for mapping a physical downlink control channel (PDCCH) across multiple transmission configuration indication (TCI) states. In some examples, the PDCCH may then be encoded using a common mother polar code for each of a first set of control channel elements (CCEs) mapped to a first TCI state and a remaining set of CCEs mapped to a second TCI state. First and second portions of the encoded PDCCH may then be transmitted, such that the first portion includes the first set of CCEs, and the second portion includes the remaining set of CCEs.