Dynamic Code Word Transmission Mode Selection for 5G MIMO
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Solution Overview
Problem
Existing communication technologies, particularly in 5G MIMO systems, face challenges in flexibly determining the code word transmission mode, leading to performance losses due to differences in channel quality across multiple transmission points.
Innovation Solution
A method where a network side device determines the number of DMRS port groups occupied by downlink transmission data to dynamically choose between single and double code word transmission modes based on the number of transmission layers supported by each transmission point, allowing for flexible configuration of the code word transmission mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single code word transmission is used for multi-transmission point transmission with rank 2-4, then device complexity is reduced, but transmission reliability deteriorates due to inability to match channels from different TRPs/panels
Solution Approach 1:
The patent implements dynamic selection between single code word transmission mode and multiple code word transmission mode based on the number of DMRS port groups. When DMRS port groups are scattered across multiple TRPs/panels, the system dynamically switches to multiple code word transmission mode to match channels from different TRPs/panels, thereby resolving the contradiction between device complexity and transmission reliability.
Solution Approach 2:
The patent changes the transmission parameter (code word transmission mode) based on the configuration of DMRS port groups. By monitoring whether DMRS port groups are scattered across multiple TRPs/panels, the system adjusts the code word transmission mode accordingly, allowing flexible adaptation to different transmission scenarios and resolving the contradiction between simplicity and performance.
2Reliability
If multiple code word transmission mode is used for all transmission scenarios, then transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies different transmission modes to different local scenarios based on DMRS port group distribution. When DMRS port groups are concentrated in one TRP/panel, single code word transmission mode is used. When scattered across multiple TRPs/panels, multiple code word transmission mode is applied locally. This localized adaptation resolves the contradiction by applying complexity only where necessary.
Solution Approach 2:
The system dynamically determines the appropriate code word transmission mode based on real-time DMRS port group configuration. Rather than using multiple code word transmission mode for all scenarios, the system adapts its behavior based on whether DMRS port groups are scattered, thereby improving reliability only when needed while maintaining simplicity in other cases.
3Ease of operation
If unified MCS is used for data layers from different TRPs/panels, then ease of operation is improved, but manufacturing precision deteriorates due to channel quality differences
Solution Approach 1:
The patent segments the data transmission into separate code words, each associated with specific DMRS port groups from particular TRPs/panels. This segmentation allows different MCS to be applied to different code words based on their respective channel qualities, thereby resolving the contradiction between ease of operation and channel matching accuracy by treating each TRP/panel's contribution separately.
Solution Approach 2:
The system changes the MCS parameter for different code words based on the channel quality of corresponding TRPs/panels. By allowing different MCS values for different code words rather than using a unified MCS, the system achieves accurate channel matching while maintaining operational simplicity through automated determination based on DMRS port group distribution.
Data Source
AI summary
The present application relates to the field of communications, and provides a transmission method and apparatus. The method includes a network side device determines a number of Demodulation Reference Signal (DMRS) port groups N occupied by downlink transmission data sent to a terminal, N being greater than or equal to 1; the network side device determines, according to the number of the DMRS port groups occupied by the downlink transmission data, a code word transmission mode corresponding to the downlink transmission data; and the network side device performs data processing on the downlink transmission data according to the code word transmission mode, and transmits the processed downlink transmission data by means of transmission points corresponding to the N DMRS port groups.