Base Station CSI-RS Parameter Forwarding for UE CQI Measurement
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Solution Overview
Problem
In next-generation mobile communication systems, user terminals face complex processes when performing CQI measurement for adjacent cells using CSI-RS, as they need to receive broadcast signals from these cells, which interrupts signal reception from the serving cell.
Innovation Solution
A base station apparatus acquires and transmits CSI-RS parameters, including cell ID, position, and transmission power of adjacent cells to the user terminal, allowing it to specify and measure CQI without receiving broadcast signals from adjacent cells, thus simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the user terminal receives broadcast signals from adjacent cells to perform CQI measurement, then the CQI measurement for adjacent cells can be achieved, but the signal reception from the serving cell is interrupted and the processes become complex
Solution Approach 1:
The base station creates a copy of the CSI-RS parameters (cell ID, position, transmission power) from the adjacent cell and transmits this copied information to the user terminal through the serving cell's broadcast channel. This allows the terminal to obtain necessary measurement parameters without directly receiving signals from the adjacent cell, thereby avoiding the need to interrupt serving cell reception and simplifying the terminal's processing requirements
Solution Approach 2:
The serving cell acts as an intermediary that receives CSI-RS parameters from the adjacent cell and forwards them to the user terminal. This mediator approach enables the terminal to access adjacent cell information through the serving cell without establishing direct communication with the adjacent cell, thus maintaining continuous reception from the serving cell while enabling CQI measurement for adjacent cells
2Loss of information
If the user terminal receives broadcast signals from adjacent cells, then CQI measurement parameters can be obtained, but the signal reception from the serving cell must be interrupted
Solution Approach 1:
The base station pre-acquires and prepares the CSI-RS parameters (cell ID, position, transmission power) of the adjacent cell before the user terminal needs to perform CQI measurement. By having this information ready in advance through the serving cell's broadcast, the terminal can immediately conduct measurements without needing to interrupt serving cell reception to obtain parameters, thus eliminating reception interruptions and time loss
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
The present invention is designed to perform CQI measurement for adjacent cells without making the processes in the user terminal UE complex. A base station apparatus (eNodeB #1) provided in the serving cell has features of acquiring, from a base station apparatus (eNodeB #2) provided in an adjacent cell, the cell ID of the adjacent cell, and the position and transmission power of the CSI-RS, as parameters related to the CSI-RS of the adjacent cell, generating a broadcast signal including the above parameters related to the CSI-RS, and transmitting the generated signal to the user terminal (UE).