Reference Signal Configuration for Heterogeneous Network Channel Optimization
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Solution Overview
Problem
In LTE R11 heterogeneous network deployment scenarios, the existing reference signal configuration methods fail to accurately configure CSI RS for UEs due to geographically separated RRHs and macro base stations, leading to suboptimal channel conditions and CRS port selection issues.
Innovation Solution
A method where a UE determines a reference signal configuration priority set and sends it to an eNB, which configures a measurement set for the UE to measure and feedback channel state information, allowing the eNB to select an optimal reference signal configuration matched to the UE's actual channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a same cell identifier corresponds to multiple transmission points (macro base station and RRHs) in heterogeneous network deployment, then the network coverage and capacity are improved, but the reference signal configuration becomes ambiguous and suboptimal channel conditions occur
Solution Approach 1:
The patent segments the reference signal configuration by introducing multiple CSI RS configuration options (first CSI RS configuration and second CSI RS configuration) corresponding to different transmission points. Each transmission point (macro base station or RRH) has its own dedicated CSI RS configuration, allowing the UE to select the appropriate configuration based on which transmission point provides the best channel conditions. This segmentation resolves the ambiguity caused by multiple TPs sharing the same cell identifier.
Solution Approach 2:
The patent implements dynamic reference signal configuration by enabling the UE to measure channel quality from multiple TPs and dynamically select the optimal CSI RS configuration. The UE determines whether to use the first or second CSI RS configuration based on real-time channel conditions, allowing the system to adapt to changing network environments and select the best serving transmission point dynamically.
2Device complexity
If CSI RS configuration is determined solely by cell identifier in R10 system, then the configuration process is simple, but it fails to account for different channel conditions of geographically separated RRHs and macro base stations
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple CSI RS configurations (first and second configurations) corresponding to different transmission points before the UE needs to select a serving TP. The eNB provides both configuration options to the UE in advance, along with measurement criteria, so that the UE can immediately perform measurements and select the optimal configuration without complex real-time decision-making delays.
Solution Approach 2:
The patent implements feedback mechanisms where the UE measures channel quality from multiple TPs using the provided CSI RS configurations and feeds back measurement results to the eNB. Based on this feedback, the eNB can determine the optimal serving transmission point and configure the appropriate CSI RS configuration for the UE, ensuring accurate channel state information while maintaining manageable system complexity.
3Quantity of substance
If multiple RRHs and macro base station share the same cell identifier, then resource utilization is improved, but the UE cannot select the optimal transmission point due to identical CRS configurations
Solution Approach 1:
The patent applies local quality by assigning different CSI RS configurations to different transmission points (macro base station and individual RRHs) even though they share the same cell identifier. Each transmission point has its own localized configuration characteristics, allowing the UE to distinguish between them and select the optimal one based on local channel conditions. This enables fine-grained differentiation while maintaining resource efficiency through shared cell identification.
Data Source
AI summary
The present invention provides a method for configuring a reference signal, a UE, and an eNB. The method includes: determining, by a UE, a reference signal configuration priority set, and sending information of the reference signal configuration priority set to an eNB; and receiving, by the UE, a reference signal configuration measurement set sent by the eNB, where the reference signal configuration measurement set is configured by the eNB according to the information of the reference signal configuration priority set, and the reference signal configuration measurement set is used for the UE to measure and feed back channel state information. In embodiments of the present invention, a reference signal configuration matched with an optimal actual channel of a UE can be selected when an RRH or a base station is geographically separated, so that the UE can acquire a good channel condition.