Small Cell Detection via Base Station Positioning and Mobility Assessment
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Solution Overview
Problem
In heterogeneous wireless communication networks, existing mechanisms for small cell detection in LTE and LTE-advanced systems face inefficiencies due to non-uniform cell distribution, leading to poor accuracy and increased power consumption, especially in hotspot areas where user equipment may fail to detect nearby small cells, resulting in suboptimal network coverage and throughput.
Innovation Solution
A device and method that utilize location information acquisition through round trip time and angle of arrival measurements, allowing the base station to independently position user equipment and evaluate its mobility state, thereby optimizing small cell detection and handover processes without overburdening user equipment resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If user equipment performs frequent inter-frequency small cell detection measurements, then detection accuracy improves, but power consumption increases and available resources are occupied
Solution Approach 1:
The patent changes the measurement parameters by introducing measurement gaps with specific configurations (measurementGapPattern0 and measurementGapPattern1) that allow the UE to perform inter-frequency measurements only during designated time periods. This parameter change enables the system to balance measurement accuracy with power consumption by controlling when measurements occur rather than continuously measuring
Solution Approach 2:
The patent implements periodic measurement action through configured measurement gaps that occur at regular intervals. The UE performs inter-frequency small cell detection measurements during these periodic measurement gaps rather than continuously, which reduces power consumption while maintaining adequate detection accuracy through timely periodic measurements
2Measurement precision
If user equipment continuously monitors for small cells, then detection accuracy improves, but available resources are greatly occupied
Solution Approach 1:
The patent applies periodic action by configuring measurement gaps that occur at specific intervals (e.g., every 40ms or 80ms) rather than continuous monitoring. This periodic measurement approach maintains detection accuracy by regularly checking for small cells while freeing up radio resources and processing capacity between measurement periods for other communication tasks
Solution Approach 2:
The patent introduces dynamic measurement configuration where the network can adjust measurement gap patterns and measurement parameters based on UE mobility state and service requirements. This dynamic approach optimizes resource usage by adapting measurement frequency to actual needs rather than using fixed continuous monitoring
3Use of energy by moving object
If measurement cycle is increased to reduce power consumption, then power consumption decreases, but detection accuracy and delay worsen
Solution Approach 1:
The patent implements dynamic measurement cycle adjustment based on UE mobility state. For high-speed UEs, longer measurement cycles are used to reduce power consumption since these UEs are less likely to camp on small cells. For low-speed or stationary UEs, shorter measurement cycles maintain detection accuracy. The network dynamically configures appropriate measurement gap patterns based on reported UE mobility information
Solution Approach 2:
The patent applies local quality by differentiating measurement requirements based on UE-specific characteristics such as mobility state and service type. Different UE instances receive different measurement configurations tailored to their local conditions, allowing power-efficient long cycles for high-speed UEs while maintaining short cycles for stationary UEs needing high detection accuracy
4Adaptability or versatility
If user equipment performs inter-frequency measurements, then small cell detection capability improves, but complexity on user equipment side increases
Solution Approach 1:
The patent introduces the network as an intermediary that manages the complexity of inter-frequency measurements. The network configures measurement gaps, provides frequency lists for measurement, and processes measurement reports. This intermediary role shields the UE from implementing complex measurement logic, reducing UE complexity while maintaining comprehensive small cell detection capability through network-coordinated measurements
Data Source
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AI summary
Disclosed are a device and method in a radio communication system. The device comprises: a location information acquisition unit (102) for use in acquiring location information of a mobile terminal; a mobile state assessment unit (104) for use in assessing a mobile state of the mobile terminal on the basis of the location information of the mobile terminal at different time; and, an execution unit (106) for use in executing, on the basis of the location information of the mobile terminal and a change in the mobile state, a corresponding operation related to microcell discovery.