Codeword-Specific Downlink Control for Multi-Codeword Demodulation
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Solution Overview
Problem
In multi-codeword transmission scenarios, terminal devices struggle to correctly demodulate data due to mismatched downlink control information across different transmission nodes in non-coherent joint transmission systems, leading to high bit error rates.
Innovation Solution
Generate downlink control information specific to each code word for terminal devices, including PDSCH resource element mapping and quasi-co-location indicators, to ensure accurate demodulation across multiple transmission nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If non-coherent joint transmission is used to improve cell edge spectral efficiency, then user experience and spectral efficiency are improved, but terminal devices cannot correctly demodulate data due to mismatched downlink control information
Solution Approach 1:
The patent segments the downlink control information into code word-specific components. Each code word transmitted from different transmission nodes has its own dedicated downlink control information containing PDSCH resource element mapping and quasi-co-location indicators tailored to that specific code word's channel characteristics, allowing accurate demodulation of each code word independently
Solution Approach 2:
The patent applies local quality by providing customized downlink control information for each code word based on the specific large-scale channel experience of each transmission node. Each transmission node's downlink control information is locally optimized to match its channel conditions, rather than using a unified control information structure
2Productivity
If multiple transmission nodes transmit different code words to improve spectral efficiency, then transmission capacity increases, but bit error rates increase due to interference and mismatched control information
Solution Approach 1:
The patent applies preliminary action by providing each terminal device with the specific downlink control information for each code word before the actual data transmission occurs. This allows the terminal device to pre-configure its demodulation parameters according to the large-scale channel experience of each transmission node, reducing bit error rates during the actual multi-codeword transmission
Data Source
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AI summary
This application discloses a multi-codeword transmission method and an apparatus. The method includes: generating, by a network device, downlink control information corresponding to each of a plurality of code words to be sent to a terminal device, where the downlink control information corresponding to each code word includes at least one of the following: a physical downlink shared channel resource element mapping and quasi-co-location indicator, and an antenna port(s), scrambling identity and number of layers; and sending, by the network device, downlink control information corresponding to the plurality of code words to the terminal device. Corresponding apparatuses are further disclosed. According to the technical solutions of this application, the network device generates the downlink control information corresponding to each of the plurality of code words to be sent to the terminal device, and the terminal device may demodulate data for the plurality of code words based on downlink control information corresponding to the plurality of code words. This ensures that the terminal device correctly demodulates data in a multi-codeword transmission scenario.