Mobile telecommunications system and a mobile telecommunications control method
First Claim
1. A mobile telecommunications system comprising:
- a plurality of radio base stations; and
a radio mobile station, which communicates with one of the radio base stations via a radio channel;
wherein the radio mobile station comprises;
a position information detector, which detects a current position on the radio mobile station;
a communications quality detector, which detects qualities of downlink communications of the respective radio base stations at the current position;
a distance calculator, which calculates distances from the radio mobile station to the radio base stations at the current position;
a travel direction detector, which detects a travel direction of the radio mobile station at the current position;
a travel velocity detector, which detects a velocity of the radio mobile station at the current position;
a position predictor, which predicts a position of the radio mobile station after an arbitrary time interval is elapsed, based on the travel direction and the velocity;
an information generator, which generates peripheral radio base station information, including the distances from the radio mobile station to respective radio base stations at the predicted position, and downlink communications qualities of respective radio base stations at the predicted position;
handover destination determinant, which determines one radio base station among the base stations as a handover destination, based on the calculated distances to respective radio base stations and downlink communications qualities of respective radio base stations in the peripheral radio base station information; and
handover controller, which performs a handover control with the radio base station determined by the handover destination determiner.
2 Assignments
0 Petitions
Accused Products
Abstract
Regulating the unnecessary handover control count and reducing the power consumption of a radio mobile station thereby reducing the load on an entire radio telecommunications system to maintain stable communications.
By adding a position calculator, a direction calculator and a velocity calculator to a radio mobile station and adding the information on a radio base station and the peripheral radio base stations into report information used by the radio base station, handover control considers the position, direction, and velocity as well as the downlink communications quality according to the related art. This regulates the unnecessary handover control count and reduces the load on the entire radio telecommunications system and the power consumption of the radio mobile station.
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Citations
10 Claims
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1. A mobile telecommunications system comprising:
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a plurality of radio base stations; and a radio mobile station, which communicates with one of the radio base stations via a radio channel; wherein the radio mobile station comprises; a position information detector, which detects a current position on the radio mobile station; a communications quality detector, which detects qualities of downlink communications of the respective radio base stations at the current position; a distance calculator, which calculates distances from the radio mobile station to the radio base stations at the current position; a travel direction detector, which detects a travel direction of the radio mobile station at the current position; a travel velocity detector, which detects a velocity of the radio mobile station at the current position; a position predictor, which predicts a position of the radio mobile station after an arbitrary time interval is elapsed, based on the travel direction and the velocity; an information generator, which generates peripheral radio base station information, including the distances from the radio mobile station to respective radio base stations at the predicted position, and downlink communications qualities of respective radio base stations at the predicted position; handover destination determinant, which determines one radio base station among the base stations as a handover destination, based on the calculated distances to respective radio base stations and downlink communications qualities of respective radio base stations in the peripheral radio base station information; and handover controller, which performs a handover control with the radio base station determined by the handover destination determiner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A computer-readable medium in which a mobile telecommunications control program for causing a computer to implement:
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a feature to-detect a downlink communications quality in the communications between a radio base station and a radio mobile station; a feature to detect a current position on the radio mobile station; a feature to calculate distances from the radio mobile station to the radio base stations at the current position; a feature to detect a travel direction of the radio mobile station at the current position; a feature to detect a velocity of the radio mobile station at the current position; a feature to predict a position of the radio mobile station after an arbitrary time interval is elapsed, based on the travel direction and the velocity; a feature to generate peripheral radio base station information, including distances to respective radio base stations at the predicted position, and downlink communications qualities of respective radio base station at the predicted position; a feature to determine one radio base station among the radio base stations as a handover destination based on the calculated distance to respective radio base stations and downlink communications quality of respective radio base stations in the peripheral radio base station information; and a feature to change the handover control parameter values and sending power to the radio mobile station based on the peripheral radio base station density calculated from the peripheral radio base station information and performs handover control with the determined radio base station as a handover destination.
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Specification