UE Interference Measurement Resource Selection for CoMP
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Solution Overview
Problem
In wireless communication systems, especially in multi-cell environments, coordinating channel state information (CSI) feedback between base stations is challenging due to large backhaul delays, which affect cooperative transmission performance and increase inter-cell interference.
Innovation Solution
A method for user equipment (UE) to receive resource block assignment information from adjacent cells, select appropriate interference measurement resources, and transmit channel quality indicators (CQI) to the serving cell, enabling efficient CSI feedback and coordination between base stations, even with large backhaul delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If coordinated multi-point (CoMP) is applied to improve throughput of UE located at cell boundary, then system performance is improved, but inter-cell interference coordination becomes more challenging due to large backhaul delays
Solution Approach 1:
The patent applies preliminary action by having the UE select and indicate the appropriate IMR type (first or second) based on anticipated interference conditions before actual interference measurement and CSI calculation. The UE receives configuration for multiple IMR types, selects the appropriate one based on resource block assignment information from adjacent cells, and provides this indication to the serving base station in advance, enabling proactive interference management despite backhaul delays
Solution Approach 2:
The patent implements dynamics by enabling the UE to dynamically switch between different IMR types (first IMR with interference from second cell, second IMR without interference from second cell) based on real-time resource block assignment information. The UE monitors adjacent cell transmissions and adapts its interference measurement approach accordingly, allowing the system to respond flexibly to changing interference conditions while maintaining CoMP performance
2Measurement precision
If interference measurement resource (IMR) selection is made to reduce inter-cell interference, then CSI accuracy is improved, but device complexity increases due to multiple IMR configurations
Solution Approach 1:
The patent applies self-service by enabling the UE to autonomously select the appropriate IMR type based on its own monitoring of resource block assignment information from adjacent cells. The UE independently determines whether to use the first IMR (with interference) or second IMR (without interference from second cell) based on whether it detects downlink data transmissions from the second cell, eliminating the need for complex network-controlled IMR selection mechanisms
Solution Approach 2:
The patent implements feedback by having the UE provide an indication of the selected IMR type to the serving base station. This feedback mechanism allows the base station to understand which interference measurement approach the UE is using, enabling appropriate CSI calculation and CoMP coordination while keeping the IMR selection process relatively simple at the UE side
Data Source
AI summary
The present invention relates to a wireless communication system. A method for a terminal reporting channel state information (CSI) in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: receiving, from a second cell, which is a serving cell and neighboring a first cell, resource block allocation information related to downlink data of the second cell; selecting, based on the resource block allocation information, either a first interface measurement resource (IMR) in which interference from the second cell is present or a second IMR in which interference from the second cell is absent; and transmitting, to the first cell, a channel quality indicator (CQI) calculated based on the IMR which has been selected.