Joint Parameter Determination for LTE-A CQI Reporting
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently reporting channel quality information across multiple carrier systems, particularly in determining and transmitting accurate channel information feedback reports that account for the total downlink bandwidth of multiple component carriers, which affects the performance and reliability of uplink communications.
Innovation Solution
A method and apparatus for generating and transmitting channel information feedback reports based on determined parameters, such as sub-band size, bandwidth parts, and preferred sub-bands, specifically designed for multiple carrier systems, allowing for precise reporting of channel quality indicators (CQI) from user equipment (UE) to eNodeB, enabling improved downlink transmission optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If channel information feedback reports are generated for each DL component carrier separately, then the accuracy of channel quality reporting is improved, but the reporting overhead and complexity increase
Solution Approach 1:
The patent divides the channel quality reporting into separate CQI reports for each DL component carrier, while using joint parameters determined from the aggregate of all DL component carriers. This segmentation allows accurate per-carrier reporting without requiring separate parameter determination for each carrier, thus reducing overall complexity while maintaining precision.
Solution Approach 2:
The patent establishes a universal set of reporting parameters (sub-band size, bandwidth parts, preferred sub-bands) that are determined jointly for all DL component carriers associated with a UL component carrier. These universal parameters are then applied across multiple carriers, reducing the need for redundant parameter determination and lowering reporting complexity while maintaining accuracy through carrier-specific CQI generation.
2Productivity
If joint parameters are determined based on total DL bandwidth of multiple component carriers, then the efficiency of parameter determination is improved, but the adaptability to individual carrier conditions deteriorates
Solution Approach 1:
The patent applies joint parameter determination (local optimization) by establishing parameters based on the total DL bandwidth of multiple component carriers. This local approach efficiently determines parameters that are then applied to individual carriers, balancing the efficiency of joint determination with the need for carrier-specific adaptation through separate CQI report generation for each DL component carrier.
Solution Approach 2:
The patent introduces a two-level parameter determination structure: joint parameters determined at the aggregate level (total DL bandwidth dimension) and carrier-specific CQI reports generated at the individual carrier level. This dimensional separation allows efficient joint parameter determination while maintaining adaptability to individual carrier conditions through separate reporting.
3Reliability
If separate CQI reports are generated for each DL component carrier, then the downlink transmission optimization is improved, but the uplink feedback overhead increases
Solution Approach 1:
The patent merges the parameter determination process for multiple DL component carriers into a single joint determination based on total DL bandwidth. This consolidation reduces the quantity of parameters that need to be signaled and processed, thereby reducing uplink feedback overhead while still enabling separate CQI report generation for each carrier to maintain downlink transmission optimization.
Data Source
AI summary
Certain aspects of the present disclosure relate to a method for determining and reporting channel information feedback for multi-carrier operation. In one aspect, channel information feedback parameters may be determined jointly across component carriers, and channel information feedback reports may be generated and reported individually per component carrier.