Terminal Resource Allocation for SU-MIMO Control Information
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Solution Overview
Problem
In SU-MIMO communications, the reception quality of control information (ACK/NACK signals) degrades when transmitted in a PUSCH, due to inconsistent resource allocation based on the coding rates of different code words (CWs).
Innovation Solution
A terminal apparatus and communication method that determine the resource allocation for control information in each layer based on the lower coding rate or the average of the inverses of the coding rates of the two code words, ensuring consistent reception quality across all layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If resource allocation for control information is based on the coding rate of one code word in SU-MIMO transmission, then the resource allocation is simple to determine, but the reception quality of control information degrades due to inconsistency across different layers
Solution Approach 1:
The patent applies local quality by determining resource allocation separately for each code word based on its own coding rate. Specifically, for each code word, the resource allocation is calculated using its individual coding rate, ensuring that each layer's control information receives appropriate resources matched to its channel conditions, thereby preventing reception quality degradation while maintaining operational feasibility
Solution Approach 2:
The patent changes the parameter used for resource allocation from a single unified coding rate to multiple code words' respective coding rates. By using the coding rate of each code word individually (or the lower coding rate among them) to determine resource allocation, the system adapts to varying channel conditions across different layers, resolving the reception quality issue
2Reliability
If resource allocation is optimized for each code word individually, then reception quality improves, but resource allocation complexity increases
Solution Approach 1:
The patent inverts the conventional approach by not using the higher coding rate but instead using the lower coding rate among the two code words for resource allocation. This inversion ensures that the more stringent resource requirements (imposed by the lower coding rate) are met, guaranteeing reception quality across all layers while avoiding the need for complex separate allocations for each code word
3Ease of operation
If the same resource allocation is used for all layers, then resource allocation is simple and consistent, but wasteful use of resources occurs when coding rates differ between code words
Solution Approach 1:
The patent changes the resource allocation parameter from a unified value to a value derived from the coding rates of multiple code words. By using the lower coding rate (or average of inverses of coding rates) to determine resource allocation, the system achieves both consistency in allocation methodology and efficiency in resource utilization, avoiding waste while maintaining operational simplicity
Data Source
AI summary
This invention is directed to a terminal apparatus capable of preventing the degradation of reception quality of control information even in a case of employing SU-MIMO transmission system. A terminal, which uses a plurality of different layers to transmit two code words in which control information is placed, comprises: a resource amount determining unit that determines, based on a lower one of the encoding rates of the two code words or based on the average value of the reciprocals of the encoding rates of the two code words, resource amounts of control information in the respective ones of the plurality of layers; and a transport signal forming unit that places, in the two code words, the control information modulated by use of the resource amounts, thereby forming a transport signal.