Downlink Signal Transport Block to Codeword Mapping Swap Flag
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Solution Overview
Problem
In multiple antenna communication systems, existing methods fail to efficiently specify the mapping relationship between transport blocks and codewords, especially when the size of information transmitted through a specific codeword is 0, leading to inefficiencies in data transmission.
Innovation Solution
A method is introduced where two or less transport blocks are mapped to two or less codewords, and these codewords are mapped to four or less layers for transmission through a downlink data channel, with a swap flag specifying the mapping relationship between transport blocks and codewords, allowing for flexible mapping based on the swap flag and transport block sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a swap flag is used to specify the mapping relationship between transport blocks and codewords, then the mapping flexibility is improved, but the control signal overhead increases
Solution Approach 1:
The patent changes the parameter representation by using a swap flag that indicates whether to apply a predefined mapping pattern or its inverse, rather than explicitly signaling all possible mapping configurations. This reduces the control signal overhead while maintaining mapping flexibility through parameter inversion.
Solution Approach 2:
The patent applies inversion by defining a swap flag where one bit value indicates the normal mapping relationship while the opposite bit value indicates the inverted mapping relationship. This allows the system to efficiently specify different mapping configurations without increasing signal overhead, as the same flag structure can represent both the original and inverted mappings.
2Reliability
If the mapping relationship is explicitly specified for all cases including when transport block size is 0, then the transmission reliability is improved, but the processing complexity increases
Solution Approach 1:
The patent applies local quality by treating the case where transport block size is 0 differently from normal cases. When the transport block size is 0, the mapping relationship is implicitly determined without requiring explicit swap flag processing, thereby reducing processing complexity while maintaining reliable mapping specification for all cases.
3Productivity
If multiple codewords are transmitted simultaneously through multiple antennas, then the system capacity is improved, but the difficulty of detecting and measuring mapping relationships increases
Solution Approach 1:
The patent reduces the difficulty of detecting mapping relationships in multi-codeword transmission by using a swap flag that indicates whether to apply a predefined mapping pattern or its inverse. This allows the receiving end to efficiently determine the correct mapping relationship by simply checking the swap flag value and applying the corresponding pattern, rather than having to detect and measure complex mapping relationships for multiple codewords.
Data Source
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AI summary
A method for specifying a transport block-to-codeword mapping relationship and a method for transmitting a downlink signal using the same are described. If a swap flag has a first logic value, a first transport block is mapped to a first codeword and a second transport block is mapped to a second codeword. If the swap flag has a second logic value, the first transport block is mapped to the second codeword and the second transport block is mapped to the first codeword. If the size of any one of two transport blocks is 0, the swap flag is not used.