CQI Feedback for Sliding-Window Superposition Coding
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Solution Overview
Problem
In cellular communication systems, existing technologies face challenges in effectively transmitting and processing channel quality information (CQI) under the influence of interference signals from neighboring cells, particularly in multi-cell environments where sliding-window superposition coding (SWSC) is applied.
Innovation Solution
The method involves estimating channels for both serving and interference base stations, generating CQI-related information based on these estimates, and transmitting this information to indicate achievable rate regions, allowing for effective CQI feedback and processing in terminals and base stations, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sliding-window superposition coding is applied in multi-cell environments, then interference signals from neighboring cells are reduced, but accurate transmission of achievable rate region information becomes challenging due to interference
Solution Approach 1:
The CQI feedback is segmented into multiple components: CQI for serving cell, CQI for interfering cells, and WSC indicator. This segmentation allows separate estimation and reporting of channel quality for different sources, enabling the base station to reconstruct the achievable rate region information even in the presence of interference signals.
Solution Approach 2:
The patent implements a feedback mechanism where the terminal estimates channels of both serving and interfering base stations, generates CQI-related information indicating the achievable rate region, and feeds this back to the base station. The base station then uses this feedback to determine optimal modulation and coding schemes, creating a closed-loop system that maintains accurate rate region information despite interference.
2Loss of information
If CQI is transmitted in traditional formats, then feedback overhead is limited, but the achievable rate region information under SWSC cannot be accurately indicated
Solution Approach 1:
The patent extends the traditional one-dimensional CQI feedback by adding a new dimension through the WSC indicator and multi-cell CQI components. This dimensional expansion allows the feedback to carry additional information about the achievable rate region under SWSC without fundamentally changing the underlying feedback mechanism, thus managing complexity while improving information accuracy.
3Ease of operation
If channel estimation is performed only for serving base station, then processing complexity is reduced, but interference management performance deteriorates
Solution Approach 1:
The terminal performs preliminary channel estimation for both serving and interfering base stations before generating CQI feedback. By estimating interfering channels in advance, the system prepares the necessary information for interference cancellation and rate region calculation, enabling effective interference management without significantly increasing real-time processing complexity at the base station.
Data Source
AI summary
The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.According to various embodiments of the present disclosure, a CQI transmission method of a terminal in a wireless communication system includes: estimating a channel of a serving base station and an interference base station to which sliding-window superposition coding (SWSC) is applied; generating channel quality information (CQI)-related information on the serving base station and the interference base station based on the estimated channel to indicate an achievable rate region; and transmitting the generated CQI-related information. However, the present disclosure is not limited to the above embodiment, and therefore other embodiments are possible.