Cell Reselection Priority Update for Ping-Pong Suppression
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Solution Overview
Problem
In LTE mobile communication systems, the method for selecting a cell with the highest reception level among multiple frequencies is not defined, leading to increased power consumption and frequent handovers due to the 'ping-pong phenomenon, where mobile station devices frequently switch between cells with varying reception levels.
Innovation Solution
A cell reselecting method that involves selecting base station devices meeting predetermined handover conditions based on reception levels and updating priority correlations to reduce the number of frequencies monitored and prevent ping-pong handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile station device monitors all frequencies and performs cell reselection based on the best cell principle, then the reception level is optimized, but the power consumption increases and frequent handovers occur
Solution Approach 1:
The patent changes the parameter of frequency priority by introducing a mechanism to update priority values based on cell type. CSG cells are assigned higher priorities than non-CSG cells, which dynamically adjusts the monitoring and selection behavior to reduce unnecessary frequency checks and handovers, thereby reducing power consumption while maintaining reliable reception.
Solution Approach 2:
The patent performs preliminary action by pre-establishing priority correlations between frequencies and cell types before cell reselection occurs. The mobile station device uses these pre-defined priority rules to quickly determine which frequencies to monitor and which cells to select, avoiding exhaustive monitoring of all frequencies and reducing power consumption.
2Reliability
If the mobile station device frequently switches between cells with varying reception levels, then the best reception is achieved, but the ping-pong phenomenon occurs and stability decreases
Solution Approach 1:
The patent changes the selection parameter by introducing cell type-based priority differentiation. By assigning higher priorities to CSG cells and using this priority information in the cell reselection evaluation, the system avoids frequent switching between cell types and reduces ping-pong handovers, thereby improving stability while maintaining reception quality.
Solution Approach 2:
The patent implements feedback by using the cell type information and priority correlations to evaluate and adjust cell reselection decisions. The mobile station device continuously monitors reception levels and uses the priority-based evaluation to determine whether a handover is beneficial, preventing unnecessary handovers and stabilizing the connection.
3Reliability
If the mobile station device monitors all peripheral frequencies, then the best cell can be selected, but the number of frequencies to be monitored increases
Solution Approach 1:
The patent changes the monitoring parameter by using priority-based frequency selection. Instead of monitoring all peripheral frequencies, the mobile station device prioritizes monitoring frequencies associated with CSG cells, as they have higher priorities. This reduces the number of frequencies to monitor while maintaining accurate cell selection.
Solution Approach 2:
The patent performs preliminary action by pre-establishing priority correlations between frequencies and cell types. This allows the mobile station device to quickly identify which frequencies should be monitored first based on their association with CSG cells, reducing the overall number of frequencies that need to be monitored while maintaining selection accuracy.
Data Source
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AI summary
The mobile station device has: a first step of selecting a plurality of base station devices meeting a predetermined handover condition, based on reception levels of a plurality of signals transmitted from the plurality of base station devices; and a second step of reselecting, if the plurality of base station devices selected in the first step include a plurality of base station devices for specific subscribers, a base station device to be accessed from among the plurality of base station devices for specific subscribers, by using a predetermined correlation between frequencies and priorities. Accordingly, the number of frequencies can be reduced, and the ping-pong phenomenon can be suppressed.