MIMO Rate Matching for Code Block Length Variance
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Solution Overview
Problem
In Multiple-Input Multiple-Output (MIMO) communication systems, existing technologies face challenges in efficiently formatting and transmitting data across multiple channels, particularly in LTE-A systems with up to eight transmit antenna ports, leading to complexity and variance in code block lengths, which affects link adaptation and system performance.
Innovation Solution
A method and system that select a transmission mode between spatial multiplexing and transmit diversity, setting a rate matching parameter based on the number of spatial layers, ensuring each time-frequency resource element contains data from only one code block, thereby simplifying processing and improving link adaptation by reducing variance in code block lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted using multiple transmit antennas in MIMO schemes, then system throughput and resilience are improved, but code block length variance increases and processing complexity increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the rate matching parameter based on the transmission mode. When spatial multiplexing is detected, a first rate matching parameter is used, while when transmit diversity is detected, a second rate matching parameter is used. This parameter adaptation resolves the contradiction by optimizing code block formatting for each specific transmission mode, thereby maintaining high throughput while reducing processing complexity through mode-specific optimization.
Solution Approach 2:
The patent implements dynamics by making the rate matching parameter adaptive rather than fixed. The system dynamically selects between different rate matching parameters based on real-time detection of transmission modes. This dynamic adjustment allows the system to handle varying code block lengths appropriately for different MIMO schemes, resolving the contradiction between maintaining high productivity and reducing processing complexity.
2Device complexity
If rate matching parameter is fixed, then system complexity is reduced, but link adaptation accuracy deteriorates
Solution Approach 1:
The patent resolves this contradiction by implementing a dynamic rate matching parameter that adapts to different transmission modes. Rather than using a fixed parameter, the system selects between a first rate matching parameter for spatial multiplexing and a second rate matching parameter for transmit diversity. This dynamic approach maintains low system complexity through simple mode-based selection while achieving high link adaptation accuracy through mode-specific optimization.
Solution Approach 2:
The patent applies local quality by using different rate matching parameters for different transmission modes. Each transmission mode receives a locally optimized parameter tailored to its specific requirements. This allows the system to maintain simplicity overall while achieving precision locally for each transmission mode, thereby resolving the contradiction between system complexity and link adaptation accuracy.
3Productivity
If code blocks are mapped onto multiple spatial layers, then data transmission efficiency is improved, but variance in code block lengths increases
Solution Approach 1:
The patent resolves this contradiction by changing the rate matching parameter based on transmission mode. For spatial multiplexing with multiple spatial layers, a first rate matching parameter is used that accommodates the varied code block lengths resulting from layer mapping. For transmit diversity, a second rate matching parameter is used. This parameter adaptation allows the system to maintain code block length uniformity despite the efficiency gains from mapping onto multiple spatial layers.
Data Source
AI summary
A method in a Multiple-Input Multiple-Output (MIMO) transmitter includes selecting a transmission mode from a group of modes including a spatial multiplexing mode and a transmit diversity mode. A rate matching parameter is set depending on at least the selected transmission mode. Data for transmission is formatted in one or more transport blocks, each transport block including multiple code blocks having respective lengths, in symbols, that are respective integer multiples of the rate matching parameter. The code blocks of a given transport block are mapped onto time-frequency resource elements in accordance with the selected transmission mode, such that each resource element contains data originating from only a respective one of the code blocks of the given transport block. The code blocks of the given transport block are transmitted over the time-frequency resource elements to a receiver.