CQI Transmission Power Control for Multi-Cell HSDPA
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Solution Overview
Problem
In multi-cell HSDPA systems, existing technologies face challenges in ensuring uniform CQI reception performance across multiple cells, leading to inefficiencies in CQI transmission and system performance.
Innovation Solution
A method is introduced where control information groups are classified and compensated to secure uniform reception performance at the base station, involving the use of different block codes and transmission power adjustments for CQI transmission channels, ensuring superior error correction and consistent reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If CQI information for multiple cells is transmitted using the same block code, then the transmission process is simple, but the reception performance is non-uniform across different cells
Solution Approach 1:
The CQI information for multiple cells is segmented into different groups, with each group assigned a specific block code. This segmentation allows different error correction capabilities to be applied to different cell groups, ensuring uniform reception performance while maintaining manageable complexity through systematic classification.
Solution Approach 2:
Different block codes with varying error correction capabilities are assigned to different CQI groups based on their specific requirements. This local quality approach ensures that each cell group receives appropriate error correction treatment, achieving uniform reception performance across all cells rather than applying a one-size-fits-all approach.
2Reliability
If different block codes are used for different CQI groups, then uniform reception performance is achieved, but the system complexity increases
Solution Approach 1:
The system segments CQI information into distinct groups that can be processed with different block codes. This segmentation organizes the complexity into manageable sections, where each group follows a defined encoding rule, making the overall system complexity controllable despite using multiple block codes.
Solution Approach 2:
The system employs a universal framework that handles multiple block codes through a common classification and transmission mechanism. This multi-functionality allows the system to accommodate different error correction requirements while maintaining a unified processing architecture, thereby limiting the increase in system complexity.
3Reliability
If CQI transmission power is increased, then reception performance improves, but power consumption increases
Solution Approach 1:
Instead of uniformly increasing transmission power for all CQI information, the system changes the error correction parameter (block code type) to achieve better reception performance. This parameter change approach improves reliability through enhanced error correction capability rather than simply increasing power consumption.
Data Source
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AI summary
A control information transmission method of an user equipment in a wireless communication system supporting multi-cell transmission, comprises receiving at least two packet data from the at least two cells, receiving at least two pilot signal from at least two cells, generating at least two control information indicating channel quality for each cell. The at least two control information are encoded respectively. Power controlling the encoded at least two control information is performed respectively. Transmitting the power controlled and encoded at least two control information on at least two control channel is performed. The at least two control channel is existed on an anchor cell of the at least two cells. Transmitting ACK/NACK information in predetermined time after packet data is performed.