Channel State Information Transmission Across Multiple Subframes
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Solution Overview
Problem
In mobile communication systems, transmitting channel state information (CQI) without degrading reception quality is challenging, especially when the number of bits required exceeds the available capacity in each subframe, leading to potential degradation in reception quality.
Innovation Solution
A user equipment terminal encodes and transmits channel state information over multiple transmission time intervals using a single carrier scheme, allowing for efficient transmission of CQI information without degrading reception quality, while a base station apparatus receives and decodes this information to assign resources accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel state information is transmitted in a single subframe, then transmission efficiency is improved, but reception quality deteriorates when the number of bits exceeds subframe capacity
Solution Approach 1:
The patent divides channel state information transmission across multiple subframes when the information volume exceeds the capacity of a single subframe. This segmentation allows the system to maintain transmission efficiency by spreading bits over multiple time intervals while preserving reception quality through complete information delivery, thereby resolving the contradiction between transmission efficiency and reception quality.
2Measurement precision
If more channel state information bits are transmitted, then channel state accuracy is improved, but transmission capacity is exceeded in single subframe
Solution Approach 1:
The patent transitions from a single-dimension (single subframe) transmission approach to a multi-dimensional approach by utilizing multiple subframes in the time domain. This dimensional expansion allows the system to transmit larger quantities of channel state information bits without exceeding the capacity constraints of any single transmission interval, thereby maintaining both channel state accuracy and adhering to transmission capacity limits.
3Reliability
If channel state information is transmitted over multiple subframes, then reception quality is maintained, but transmission time increases
Solution Approach 1:
The patent implements a dynamic transmission strategy where the number of subframes used for channel state information transmission is adaptively determined based on the volume of information to be transmitted. When the bit count fits within a single subframe, transmission is completed in one interval; when it exceeds capacity, the system dynamically extends transmission across multiple subframes. This dynamic approach maintains reception quality while minimizing transmission time by avoiding unnecessary time extensions.
Data Source
AI summary
A user equipment terminal estimates a channel state, encodes channel state information representing the estimated channel state, and transmits the channel state information over plural transmission time intervals. A base station apparatus receives the channel state information over plural transmission time intervals, decodes the channel state information, and assigns resources based on the channel state information. The present invention provides the user equipment terminal, the base station apparatus, and a channel state information communication method.