Pico Base Station Subband Beacon Selection for Interference Reduction
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Solution Overview
Problem
In wireless communication systems, especially in macro cell coverage areas, there is a need for an effective scheme to allocate and select frequency resources for small cell base stations, particularly to improve frequency resource distribution and cell discovery for user equipment (UE) connected to or seeking to connect with small base stations.
Innovation Solution
A method involving pico base stations within a macro base station's coverage area, where beacon signals are received, their qualities measured, and suitable subbands are selected for transmission, allowing for efficient frequency resource allocation and UE connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beacon signals are transmitted in all subbands, then cell discovery and frequency resource allocation are improved, but system complexity and interference increase
Solution Approach 1:
The system divides the frequency band into multiple subbands and assigns different pico base stations to transmit beacon signals in different subbands. This segmentation allows UEs to discover cells while reducing overall system complexity and interference by distributing the beacon transmission across frequency segments rather than having all stations transmit in all subbands.
Solution Approach 2:
Different subbands are allocated to different pico base stations based on local conditions such as interference levels and traffic demands. This local quality approach allows each pico base station to optimize its beacon transmission in its specific frequency subband, improving cell discovery accuracy while managing system complexity through localized rather than global beacon transmission.
2Productivity
If pico base stations transmit beacon signals in all subbands, then frequency resource distribution is improved, but interference between cells increases
Solution Approach 1:
The frequency spectrum is segmented into multiple subbands, with each pico base station responsible for beacon transmission in specific subbands. This segmentation reduces interference between cells by ensuring that not all pico base stations transmit beacons simultaneously across the entire frequency spectrum, thus improving frequency resource allocation efficiency while controlling interference levels.
Solution Approach 2:
Pico base stations transmit beacon signals periodically in their assigned subbands rather than continuously in all subbands. This periodic action in specific subbands allows for efficient frequency resource distribution while reducing interference by limiting the temporal and spectral presence of beacon signals from each pico base station.
3Reliability
If UEs measure all subbands for cell discovery, then connection accuracy is improved, but power consumption and measurement time increase
Solution Approach 1:
The frequency band is divided into multiple subbands, allowing UEs to measure and discover cells in a segmented manner rather than measuring all subbands simultaneously or sequentially. This segmentation reduces measurement time and power consumption while maintaining connection accuracy by distributing the measurement task across multiple frequency segments.
Solution Approach 2:
The system pre-configures which pico base stations transmit beacons in which subbands, allowing UEs to perform measurements in a predetermined sequence or focus on specific subbands based on prior information. This preliminary action reduces the overall measurement time and power consumption while maintaining reliable cell discovery and connection accuracy.
Data Source
AI summary
According to one embodiment of the present invention, disclosed is a method for measuring a subband by pico base station(s) located within a coverage of a macro base station in a wireless communication system. The method is performed by a first pico base station, and comprises the steps of: receiving beacon signals from other pico base station(s) in the coverage of the macro base station via each subband of all the subbands of the whole band of the wireless communication system, and measuring the receiving quality of the beacon signal received via each subband; determining whether to select at least one subband from among said all subbands based on the measured receiving quality of the beacon signal; and transmitting, if at least one subband is selected, the beacon signal via the selected at least one subband.