Transport Block to Codeword Mapping via DCI Bit Fields
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Solution Overview
Problem
Current mobile communication systems face challenges in accurately determining the correspondence between transport blocks and codewords, leading to incorrect decoding results and inefficient use of system resources, particularly in 5G networks with diverse service scenarios like eMBB, URLLC, and mMTC.
Innovation Solution
A method is introduced where terminal devices determine the correspondence between transport blocks and codewords based on specific information within the downlink control information (DCI), using bit fields such as C-DAI, T-DAI, MCS, and RV, to accurately map transport blocks to their corresponding codewords, enabling separate feedback of HARQ information and improving resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device uses default mapping (transport block to codeword 0) without explicit indication, then the device complexity is reduced, but the reliability of decoding feedback deteriorates due to incorrect mapping determination
Solution Approach 1:
The patent applies preliminary action by pre-defining mapping rules between transport blocks and codewords based on DCI format types and search space sets. The terminal device determines the mapping relationship in advance through configuration information and predefined rules, eliminating the need for complex real-time determination while ensuring correct mapping. This resolves the contradiction by establishing the mapping relationship beforehand through standardized rules rather than requiring complex device logic.
2Reliability
If the terminal device determines correct correspondence between transport block and codeword using DCI bit fields, then the reliability of HARQ feedback is improved, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The patent applies parameter changes by utilizing existing DCI parameters (such as DCI format type, search space set identifier, and bit field values) to determine the transport block to codeword mapping relationship. Instead of adding complex new mechanisms, the solution changes the interpretation and usage of existing parameters to encode mapping information. This resolves the contradiction by extracting mapping information from already-present DCI parameters without requiring additional complex processing logic.
3Loss of information
If multiple transport blocks are mapped to the same codeword to reduce overhead, then the loss of information is reduced, but the productivity deteriorates due to inability to provide separate feedback for each transport block
Solution Approach 1:
The patent applies segmentation by enabling separate mapping of different transport blocks to different codewords based on DCI indications. This allows the terminal device to decode and provide separate HARQ feedback for each transport block independently. The segmentation of feedback information per transport block improves transmission efficiency by allowing selective retransmission of only failed blocks, resolving the contradiction between information completeness and transmission efficiency.
Data Source
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AI summary
This application provides a method for determining a correspondence between a transport block and a codeword, a related device, and a system. The method includes: A terminal device receives first downlink control information DCI, where the first DCI is used to indicate the terminal device to receive a first transport block on a first time-frequency resource; and the terminal device determines, based on first information, that the first transport block is mapped to a first codeword, where the first information includes at least one of the following: first search space in which the first DCI is located, a first DCI format corresponding to the first DCI, a first radio network identifier RNTI used for scrambling the first DCI, or a first bit field included in the first DCI. According to the foregoing method, a mapping relationship between a transport block and a codeword can be properly determined.