MIMO Codeword-to-Layer Mapping for Control Data Multiplexing
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Solution Overview
Problem
In MIMO communications systems, existing technologies face challenges in efficiently multiplexing control and data channels, particularly in LTE-Advanced uplink transmissions with multiple MIMO layers, where optimal codeword-to-layer mapping and resource allocation are needed to ensure reliable control information transmission and maximize coverage.
Innovation Solution
The method involves selecting a set of codewords for multiplexing control and data symbols across multiple MIMO layers, with specific rules for selecting codewords based on modulation and coding schemes, channel quality, and HARQ status, and distributing control symbols accordingly to maximize spatial diversity and coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If control and data are multiplexed on the same subframe with multiple MIMO layers, then spectral efficiency is improved, but reliability of control information transmission deteriorates
Solution Approach 1:
The invention segments control information across multiple codewords and layers. Specifically, control information is divided and mapped to different codewords (e.g., first control information to first codeword, second control information to second codeword), which are then transmitted on different MIMO layers. This segmentation ensures that control information is distributed across multiple transmission paths, improving reliability while maintaining spectral efficiency through parallel transmission.
2Productivity
If multiple codewords are transmitted simultaneously on multiple MIMO layers, then data transmission rate is improved, but complexity of codeword-to-layer mapping increases
Solution Approach 1:
The invention applies local quality by assigning different mapping rules to different codewords based on their specific characteristics. For example, when a codeword carries control information, it is mapped to specific layers with appropriate redundancy; when it carries only data, it follows standard mapping procedures. This localized adaptation of mapping strategies reduces overall system complexity while maintaining high data transmission rates.
3Productivity
If control information is multiplexed with data on PUSCH, then resource utilization is improved, but interference between control and data signals increases
Solution Approach 1:
The invention resolves interference by transitioning from time-domain multiplexing to spatial-domain multiplexing. Control and data information are mapped to different MIMO layers (spatial dimensions) rather than being multiplexed in the same time-frequency resources. This dimensional separation allows simultaneous transmission of control and data on the same physical uplink shared channel without mutual interference, achieving both high resource utilization and signal quality.
Data Source
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AI summary
A system and method for system and method for multiplexing control and data channels in a multiple input, multiple output (MIMO) communications system are provided. A method for transmitting control symbols and data symbols on multiple MIMO layers includes selecting a first set of codewords from Ncw codewords, distributing control symbols onto the first set of layers, placing data symbols of the first set of codewords onto the first set of layers, placing data symbols of the (Ncw - Ncw1) remaining codewords to remaining layers if Ncw > Ncw1, and transmitting the multiple MIMO layers. The first set of codewords is associated with a first set of layers from the multiple MIMO layers, and the Ncw codewords are to be transmitted simultaneously and the first set of codewords comprises Ncw1 MIMO codewords, where Ncw and Ncw1 are integers greater than or equal to 1. The remaining layers are MIMO layers from the multiple MIMO layers not in the first set of layers.