Uplink Control Information Multiplexing for Coordinated Multi-Point Systems
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Solution Overview
Problem
In coordinated multi-point wireless communication systems, existing methods face challenges in efficiently transmitting uplink control information across multiple transmission points without causing inter-cell interference and incurring large backhaul overhead.
Innovation Solution
The method involves multiplexing channel state information from multiple transmission points onto a physical uplink control channel using time-division, code-division, or frequency-division multiplexing techniques, allowing for efficient transmission while minimizing inter-cell interference and backhaul overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If channel state information from multiple transmission points is transmitted separately on different physical uplink control channels, then each transmission point can independently receive its control information, but inter-cell interference occurs and backhaul overhead increases
Solution Approach 1:
The patent merges channel state information from multiple transmission points into a single physical uplink control channel for transmission. The user equipment multiplexes CSI reports from different transmission points and sends them together on one channel, eliminating inter-cell interference while maintaining reliable delivery through unified resource allocation and interference-free transmission.
2Reliability
If channel state information from multiple transmission points is transmitted separately on different physical uplink control channels, then each transmission point can independently receive its control information, but backhaul overhead becomes large
Solution Approach 1:
The patent combines multiple CSI reports from different transmission points into a single uplink transmission. By consolidating the control information from multiple sources into one unified report sent over a single channel, the system significantly reduces backhaul overhead and resource consumption while maintaining complete information delivery to all transmission points.
3Loss of energy
If a single physical uplink control channel is used to carry CSI reports for multiple transmission points using time multiplexing, then backhaul overhead is reduced and inter-cell interference is avoided, but transmission time increases
Solution Approach 1:
The patent segments the transmission of channel state information by dividing it into different time slots or subframes. Each transmission point's CSI report is allocated to specific time resources within the multiplexed structure, allowing efficient sequential transmission that minimizes overall transmission time while maintaining low overhead and avoiding interference.
Data Source
Figure 1
AI summary
The present invention provides a method for transmitting uplink control information in coordinated multi-point system. According to an embodiment of the present invention, a method for feeding back channel state information of multiple transmission points in a coordinated multi-point cooperating set is provided, and the method includes: receiving reference signals of the multiple transmission points; based on the reference signals of the multiple transmission points, evaluating channel state information of each of the multiple transmission points; multiplexing and transmitting the channel state information of the multiple transmission points on a physical uplink control channel (PUCCH) of one of the multiple transmission points in a predetermined mapping sequence. The present invention solves the problem caused by coordinated multi-point as to how a user equipment feeds back uplink control information of multiple transmission points on a physical uplink control channel, and is beneficial to further development and application of the coordinated multi- point technology.