Uplink Control Signaling Mapping in LTE-A PUSCH Spatial Multiplexing
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Solution Overview
Problem
There is no effective solution for transmitting uplink control signaling in the Physical Uplink Shared Channel (PUSCH) when it uses spatial multiplexing in the Long Term Evolution Advanced (LTE-A) system, particularly when two transport blocks/codewords are involved.
Innovation Solution
Select one of the two transport blocks/codewords to carry the uplink control signaling, determining the encoding scheme based on the modulation and coding scheme index of the selected block, and transmit the signaling after encoding, ensuring that the uplink control signaling can be effectively sent to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial multiplexing is used in PUSCH to transmit two transport blocks/codewords, then the data transmission capacity is improved, but there is no effective solution for transmitting uplink control signaling
Solution Approach 1:
The patent segments the control signaling transmission by assigning different control information to different transport blocks. Specifically, first control information (such as CQI/PMI) is carried on the first transport block, while second control information (such as ACK/NACK) is carried on the second transport block, enabling control signaling transmission in spatial multiplexing mode
Solution Approach 2:
The patent makes each transport block universally capable of carrying both data and control information. The first transport block can carry data plus first control information, and the second transport block can carry data plus second control information, allowing the system to maintain flexibility while supporting spatial multiplexing
2Reliability
If uplink control signaling is multiplexed with uplink data in PUSCH, then the control signaling can be transmitted, but the modulation and coding scheme must be determined which affects transmission quality
Solution Approach 1:
The patent applies different modulation and coding schemes to different transport blocks based on their specific requirements. The first transport block uses a first modulation and coding scheme determined by first downlink channel quality information, while the second transport block uses a second modulation and coding scheme determined by second downlink channel quality information, optimizing transmission quality for each block independently
Data Source
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AI summary
The present invention discloses a method for transmitting uplink control signaling in a Physical Uplink Shared Channel (PUSCH). The method includes: when two transport blocks/codewords are transmitted in the PUSCH, mapping uplink control signaling to the layer corresponding to one of the two transport blocks / codewords to transmit. The present invention also discloses an apparatus for transmitting uplink control signaling in the PUSCH. The apparatus includes: a mapping unit, used for mapping uplink control signaling to the layer corresponding to one of two transport blocks/codewords when the two transport blocks/codewords are transmitted in the PUSCH; and a transmission unit, used for transmitting the uplink control signaling. The present invention effectively solves the problem of transmitting uplink control signaling in the PUSCH when the PUSCH uses spatial multiplexing in an LTE-A system, and ensures the data capacity. The channel quality corresponding to the transport blocks selected in various ways is relatively good, thereby ensuring the transmission quality of the uplink control signaling.