Cell Selection Using Loading Indicators in Heterogeneous Networks
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Solution Overview
Problem
In heterogeneous wireless communication networks, interference between macrocells and picocells, as well as irregular distribution of mobile stations, leads to reduced transmission efficiency due to unused resources and decreased throughput, necessitating an effective cell selection method to enhance transmission capacity.
Innovation Solution
A method and apparatus for a mobile station to select a serving cell by considering the loading indicator and signal strength quality factor of neighboring base stations, where the loading indicator is determined by each base station and transmitted to the mobile station, allowing the mobile station to choose the best cell based on loading rates, loadable bandwidth, and effective bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If N-ary compact cells are installed in one macrocell to increase transmission capacity, then the transmission band can be ideally secured N times, but interference between heterogeneous cells and irregular distribution of mobile stations degrade the performance and reduce actual throughput
Solution Approach 1:
The patent applies local quality by allowing different cells to have different resource allocation strategies based on their local conditions. Each base station determines loading indicators specific to its cell, and mobile stations select serving cells based on local signal strength and loading conditions. This enables localized optimization of resource allocation to mitigate interference while maintaining overall system capacity.
Solution Approach 2:
The patent changes the parameter of cell selection criteria from solely signal strength to a composite parameter including both signal strength and loading indicator. This parameter change allows the system to dynamically adjust resource allocation based on current network conditions, reducing interference by directing mobile stations to less loaded cells while maintaining connection quality.
2Reliability
If mobile stations select serving cell based only on signal strength quality factor, then connection quality is maintained, but resources in some picocells remain unused and transmission efficiency decreases
Solution Approach 1:
The patent implements feedback by having base stations determine and broadcast loading indicators to mobile stations. Mobile stations use this feedback information about network load conditions combined with signal strength measurements to make informed cell selection decisions. This feedback mechanism ensures both connection quality (through signal strength consideration) and transmission efficiency (through load balancing).
Solution Approach 2:
The patent introduces dynamics by making cell selection criteria adaptive rather than static. The loading indicator provides real-time information about network conditions, allowing mobile stations to dynamically adjust their serving cell selection based on current load distribution. This dynamic approach enables the system to respond to changing conditions and optimize resource utilization.
Data Source
AI summary
An apparatus is configured to perform a method for selecting a cell to increase transmission capacity in a wireless communication system. A Mobile Station (MS) can select a cell in a heterogeneous network system. The MS can receive a loading indicator for each of a plurality of Base Stations (BS); measure signal strength information for each of the BSs; and select one of the BSs using the loading indicator and the signal strength information. Therefore, the transmission efficiency of the system can be increased.