CSI Report Control for CoMP Interference Measurement
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Solution Overview
Problem
In modern mobile communication systems like LTE, the conventional CSI report mode is inadequate for CoMP transmission due to multiple interference assumptions, necessitating a new CSI report mode that supports Interference Measurement Resource (IMR) feedback.
Innovation Solution
A method and apparatus for controlling a CSI report in a UE, which includes determining a CSI report set with multiple CSI feedback modes, each comprising a Non-Zero Power Reference Signal (NZP RS) resource part for channel measurement and an IMR part for interference measurement, and sending RRC signaling to the UE to indicate the CSI report set, allowing for dynamic configuration of NZP CSI-RS resources and IMRs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional CSI report mode is used, then the system is simple and easy to operate, but it cannot support multiple interference assumptions required for CoMP transmission
Solution Approach 1:
The CSI report mode is segmented into multiple distinct feedback modes (e.g., first CSI feedback mode, second CSI feedback mode), each configured for specific interference measurement scenarios. This allows the system to support multiple interference assumptions while keeping each individual mode manageable and well-defined.
Solution Approach 2:
The CSI report mechanism is designed with multi-functionality to handle various CoMP transmission modes (JT, DPS, DPB, CS/CB) through a unified framework. The same CSI reporting infrastructure supports different interference measurement resource configurations and feedback formats, making the system adaptable to diverse CoMP scenarios without requiring separate mechanisms for each mode.
2Measurement precision
If IMR is introduced for interference measurement in CoMP, then interference measurement capability is improved, but the conventional CSI report mode becomes inadequate
Solution Approach 1:
The CSI report mode is made dynamic and configurable through RRC signaling, allowing the network to adapt the CSI feedback mode to match the specific IMR configuration and CoMP transmission mode being used. This dynamic configuration enables the system to maintain high measurement precision while ensuring the CSI report mode remains applicable to various IMR scenarios.
3Adaptability or versatility
If multiple CSI feedback modes are configured for different CoMP transmission modes, then adaptability to various interference scenarios is improved, but signaling complexity increases
Solution Approach 1:
Different CSI feedback modes are configured with varying parameters such as CSI process IDs, IMR resource configurations, and feedback formats according to specific CoMP transmission mode requirements. By changing these parameters dynamically through RRC signaling, the system achieves high adaptability while avoiding the need for completely separate reporting mechanisms for each mode.
Data Source
AI summary
The present invention relates to a method and an apparatus for controlling a Channel State Information (CSI) report. According to an embodiment of the present invention, a method for controlling a CSI report of a User Equipment (UE) in a base station of a Long Term Evolution (LTE) mobile communication network is provided. The method includes a step of determining a CSI report set for a UE, where the CSI report set includes multiple CSI feedback modes, and each CSI feedback mode is defined to include a Non-Zero Power Reference Signal (NZP RS) resource part for channel measurement and an Interference Measurement Resource (IMR) part for interference measurement. In addition, the method further includes a step of sending to the UE Radio Resource Control (RRC) signaling indicating the CSI report set.