CSI-RS Measurement Configuration for CoMP Interference Resolution
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Solution Overview
Problem
In current CoMP systems, the measurement accuracy of cell-specific reference signals (CRS) is compromised due to resource interference, making it difficult for base stations to distinguish and manage measurement results from different cells effectively.
Innovation Solution
The method involves including physical cell identity and CSI-RS configuration information in measurement configuration messages, allowing user equipment (UE) to differentiate between cells with the same physical cell identity and report accurate CSI-RS measurements to the base station, thereby avoiding resource interference and enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CRS measurement is used in CoMP system, then measurement can be performed using existing reference signals, but measurement accuracy deteriorates due to resource interference from other cells
Solution Approach 1:
The patent extracts the measurement function from CRS to a dedicated reference signal (CSI-RS). By separating the measurement purpose from the general-purpose CRS, the measurement reference signal can be specifically optimized for measurement accuracy without being interfered with by data transmissions in the same time-frequency resources, thus resolving the contradiction between system compatibility and measurement precision.
Solution Approach 2:
The patent introduces a new reference signal (CSI-RS) as an intermediary between the measurement requirement and the existing CRS system. This intermediary signal serves the measurement function while avoiding the interference problem of CRS, allowing the system to maintain compatibility with existing CoMP structures while achieving improved measurement accuracy.
2Device complexity
If multiple cells use the same physical cell identity, then resource allocation is simplified, but the base station cannot distinguish measurement results from different cells
Solution Approach 1:
The patent implements a feedback mechanism where the base station provides measurement configuration information including cell identity to the UE, and the UE returns measurement results that are associated with the provided cell identity. This feedback loop ensures that even when multiple cells share the same physical cell identity, the base station can distinguish measurement results through the configured cell identity parameter, resolving the information loss problem while maintaining simplified resource allocation.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the UE with measurement configuration information that includes cell identity before measurement occurs. This preliminary configuration establishes a mapping relationship between cells and measurement results in advance, enabling the base station to distinguish measurement results from different cells without increasing resource allocation complexity during actual operation.
3Productivity
If other cells use time-frequency resources occupied by CSI-RS for data transmission, then resource utilization is improved, but measurement accuracy deteriorates due to interference
Solution Approach 1:
The patent segments the time-frequency resources by dedicating specific resources exclusively to CSI-RS transmission. This segmentation creates protected measurement resources that are separated from data transmission resources, ensuring that measurement accuracy is not compromised by data transmissions in the same resources, while other time-frequency resources remain available for data transmission to maintain overall resource utilization.
Data Source
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AI summary
Disclosed are a cell measurement method and a related device. The cell measurement method includes: a base station sends a measurement configuration message to a user equipment, wherein the measurement configuration message comprises a physical cell identity, channel state information - reference signal (CSI-RS) configuration information corresponding to each of a plurality of cells indicated by the physical cell identity, and a configuration index number of the CSI-RS configuration information; and receiving, by the base station from the UE, a CSI-RSRP and the configuration index number, wherein the CSI-RSRP is obtained from measuring on a CSI-RS corresponding to a first cell of the plurality of cells based on a resource of the first cell according to CSI-RS configuration information corresponding to the first cell.