CSI-RS Resource Segmentation for Interference Coordination
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Solution Overview
Problem
In ultra-dense wireless communication networks, the increase in interference signals due to dense cell deployment limits network capacity, and existing technologies like CoMP struggle to effectively eliminate inter-cell interference, especially since few terminals support the required transmission mode TM 10.
Innovation Solution
A method and apparatus for channel state information measurement that allows access points to periodically send CSI-RS in a time or frequency division manner, enabling the network side device to obtain independent CSI from each access point, thereby avoiding codebook mismatch and facilitating interference coordination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple CSI-RS are configured for CoMP technology, then inter-cell interference can be coordinated, but terminal compatibility deteriorates since few terminals support transmission mode TM 10
Solution Approach 1:
The patent segments the CSI-RS resources by assigning different resource configurations (different subframe offsets, frequency shifts, or resource block allocations) to different access points. This allows the terminal to measure channel state information from multiple access points using a single CSI-RS configuration, enabling CoMP without requiring TM 10 support. The segmentation of radio resources resolves the contradiction by making multi-AP measurement compatible with existing terminal capabilities.
Solution Approach 2:
The patent changes the parameters of CSI-RS transmission by introducing access point-specific configuration parameters such as subframeOffset, frequencyShift, and resourceBlockAllocation. These parameter variations allow different access points to transmit CSI-RS on different resources while the terminal uses a unified measurement approach. This parameter differentiation enables interference coordination while maintaining terminal compatibility.
2Productivity
If dense cell deployment is performed to increase spatial reuse rate, then network capacity is improved, but interference signals are increased making the system interference-limited
Solution Approach 1:
The patent implements a feedback mechanism where the terminal measures channel state information from multiple access points using CSI-RS and feeds back this information to the network side device. The network side device uses this feedback to coordinate transmission among access points, adjusting precoding weights and resource allocation to minimize interference. This closed-loop feedback system enables dense deployment while controlling interference through informed coordination.
Solution Approach 2:
The patent performs preliminary channel measurement and interference assessment by having the terminal measure CSI from multiple access points before actual data transmission. The network side device uses these preliminary measurements to pre-coordinate transmission parameters, select serving access points, and configure interference management strategies. This preliminary action prevents interference problems rather than reacting to them, enabling high-capacity dense deployment.
Data Source
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AI summary
Embodiments of this application provide a channel state information measurement method and apparatus and a network side device. The measurement method includes: A network side device configures channel state information reference signal CSI-RS transmit information of M access points, where the CSI-RS transmit information is used to indicate the M access points to periodically send a CSI-RS to a first user equipment at a preset interval, the preset interval is a time interval and/or a subband interval, and M is an integer greater than 1. The network side device obtains channel state information CSI corresponding to each of the M access points, where the CSI corresponding to the access point includes first CSI, and the first CSI is information that is measured based on the CSI-RS corresponding to the access point and fed back by the first user equipment. When the preset interval is the subband interval, a PMI in the CSI corresponding to the access point is fed back at a granularity of a subband.