Terminal Layer Arrangement for ACK/NACK and CQI Separation
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Solution Overview
Problem
In LTE-Advanced systems, the increased number of ACK/NACK signals transmitted on uplinks during asymmetric carrier aggregation can lead to a higher probability of ACK/NACK intruding into CQI regions, causing CQI-related reception errors.
Innovation Solution
A terminal and communication method that prioritize arranging error detection results and downlink quality information in multiple layers based on a specific arrangement rule, ensuring that error detection results are preferentially arranged in layers different from those used for channel quality information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ACK/NACK signals are transmitted in the same layer as CQI during asymmetric carrier aggregation, then transmission resources are utilized efficiently, but CQI-related reception errors increase due to ACK/NACK intrusion into CQI regions
Solution Approach 1:
The patent segments the transmission layers into distinct regions for ACK/NACK and CQI signals. By separating these control signals into different layers, the system prevents ACK/NACK from intruding into CQI regions, thereby maintaining CQI reception quality while still utilizing multiple layers for efficient resource transmission.
Solution Approach 2:
The patent applies local quality by assigning different layers to different control signals based on their specific requirements. ACK/NACK signals are placed in layers optimized for their transmission characteristics, while CQI signals are placed in separate layers with appropriate resource allocation, ensuring each signal type receives optimal transmission quality tailored to its specific needs.
2Reliability
If multiple layers are used for transmitting control information during MIMO, then transmission diversity is improved, but the probability of ACK/NACK intruding into CQI regions increases
Solution Approach 1:
The patent segments the multiple transmission layers into distinct functional regions. By dividing the layer space and assigning specific layers to ACK/NACK and CQI respectively, the system maintains transmission diversity benefits while preventing harmful interference between control signal types through clear spatial separation.
Solution Approach 2:
The patent introduces layer separation as an intermediary mechanism between ACK/NACK and CQI signals. This intermediary structure allows both signal types to be transmitted simultaneously with diversity benefits while the layer boundary acts as a protective barrier preventing ACK/NACK from intruding into CQI regions.
Data Source
AI summary
An integrated circuit includes circuitry, which, in operation, controls transmitting downlink data to a terminal apparatus; receiving a plurality of transport blocks which are transmitted in a same time period using a same frequency band in a spatial multiplexing scheme, wherein a same acknowledgement information (ACK/NACK) relating to an error detection result of the downlink data is scrambled with different scrambling schemes respectively for the plurality of transport blocks and the respectively scrambled ACK/NACK is multiplexed with data on respective ones of the plurality of transport blocks, and channel quality information (CQI) of a downlink channel is multiplexed with the data on only one transport block of the plurality of transport blocks by the terminal apparatus; and extracting the ACK/NACK and the CQI from the received plurality of transport blocks.