CoMP Channel Feedback Reporting via PUCCH and PUSCH Segmentation
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Solution Overview
Problem
In Cooperative Multipoint (CoMP) communication systems, the large size of channel feedback for multiple channels requires considerable uplink bandwidth, leading to performance degradation.
Innovation Solution
Assigning multiple Channel State Information Reference Signals (CSI-RS) resources to cells, with a first subset for periodic reporting on a Physical Uplink Control Channel (PUCCH) and a second subset for a-periodic reporting on a Physical Uplink Shared Channel (PUSCH), allowing channel feedback to be computed and transmitted efficiently with minimal overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If channel feedback for multiple CoMP channels is transmitted using traditional methods, then complete channel information is provided to the network, but uplink bandwidth consumption increases significantly
Solution Approach 1:
The patent segments the channel feedback transmission by dividing CoMP channels into two groups: first group channels are reported periodically on PUCCH, while second group channels are reported aperiodically on PUSCH. This segmentation allows the system to provide complete channel feedback information while distributing the uplink bandwidth consumption across different channels and time periods, thereby resolving the contradiction between information completeness and bandwidth consumption.
2Reliability
If periodic reporting is used for all CSI-RS resources, then feedback is provided regularly, but uplink control channel capacity is exceeded
Solution Approach 1:
The patent implements periodic action by configuring the terminal to periodically report channel feedback for first group CSI-RS resources on PUCCH, while using aperiodic reporting for second group CSI-RS resources on PUSCH. This approach maintains regular feedback for critical channels while reducing overall control channel capacity requirements by selectively applying different reporting periodicities.
3Quantity of substance
If aperiodic reporting is used for all CSI-RS resources, then uplink overhead is reduced, but feedback timeliness is degraded
Solution Approach 1:
The patent applies local quality by differentiating the reporting characteristics for different groups of CSI-RS resources. First group resources use periodic reporting with higher timeliness requirements, while second group resources use aperiodic reporting with lower overhead requirements. This localized differentiation allows the system to optimize feedback timeliness for critical channels while reducing overall uplink overhead.
Data Source
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AI summary
A method includes receiving, in a communication terminal (24), signals from a group of cells (28). The group of cells cooperates in a Coordinated Multipoint (CoMP) transmission scheme that assigns multiple Channel State Information Reference Signals (CSI-RS) resources to the cells. A first subset of the CSI-RS resources is assigned to periodically report channel feedback on a first uplink channel, and a second subset of the CSI-RS resources is assigned to a-periodically report the channel feedback on a second uplink channel. The channel feedback is computed for the multiple CSI-RS resources. The channel feedback computed for the CSI- RS resources is transmitted in the first subset on the first uplink channel, and the channel feedback computed for the CSI-RS resources in the second subset is transmitted on the second uplink channel.