Base Station Cell Measurement Target Control for LTE Interference
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Solution Overview
Problem
In LTE-Advanced heterogeneous networks, high-power base stations face challenges in managing uplink interference from user terminals located at the boundary of low-power base station coverage areas, leading to communication disruptions due to synchronization signal cancellation and power differences between base stations.
Innovation Solution
A communication control method that involves transmitting information between base stations to prevent certain cells from being selected as measurement targets for user terminals, and limiting transmission power in specific frequency bands or subframes to allow user terminals to perform measurements and handovers effectively, while avoiding communication disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the high-power base station limits transmission power to allow user terminals to measure the low-power base station's synchronization signal, then measurement capability is improved, but communication disruption or failure occurs in user terminals performing handover
Solution Approach 1:
The patent applies local quality by making different cells have different measurement attributes. The high-power base station marks specific cells as non-measurement targets, allowing user terminals to perform measurements on other cells without interference. This selective approach enables synchronization signal measurement in certain areas while maintaining communication reliability in others.
Solution Approach 2:
The patent segments the measurement process by dividing cells into measurement-target and non-measurement-target categories. This segmentation allows user terminals to selectively measure only appropriate cells, avoiding interference from high-power base stations while maintaining handover capability to valid targets.
2Reliability
If the high-power base station does not limit transmission power, then communication reliability is maintained, but user terminals cannot receive the low-power base station's synchronization signal due to cancellation
Solution Approach 1:
The patent extracts the problematic measurement function from the high-power base station's cells by marking them as non-measurement targets. This extraction allows the high-power base station to maintain full transmission power for communication reliability while removing the interfering measurement capability from specific cells, enabling user terminals to measure low-power base stations without cancellation.
3Ease of operation
If information is transmitted between base stations to prevent cell selection as measurement targets, then handover control is improved, but system complexity increases
Solution Approach 1:
The patent applies universality by using a standardized information element structure that can be applied across multiple base stations and cells. The non-measurement target indication mechanism is a general-purpose solution that works for any cell configuration, simplifying implementation despite the added communication overhead between base stations.
Data Source
AI summary
A communication control method in a mobile communication system, comprises: a step A of transmitting information from a base station having at least one cell to a neighboring base station, the information notifying that a particular cell of the base station is to be prevented from being selected as a measurement target for mobility control of a user terminal under control of the neighboring base station; and a step B of, when receiving the information from the base station at the step A, performing control by the neighboring base station based on the received information such that the user terminal under control of the neighboring base station avoids selecting the particular cell as the measurement target.