Radio-parameter control in mobile radio communications system
First Claim
1. A system for controlling radio parameters for use in radio communication between a base station and a mobile station, comprising:
- a plurality of mobile stations, each of which has a position detector for detecting a current location of its own;
a plurality of base stations each forming a plurality of radio zones, in which a mobile station is allowed to communicate with a corresponding base station, wherein each of the base stations periodically transmits a down-link reference signal;
a plurality of fixed stations, which are distributed at predetermined locations in a service are a composed of the plurality of radio zones, wherein each of the fixed stations receives the down-link reference signal from a corresponding base station to produce received-signal condition data of the down-link reference signal;
a statistical analyzer for statistically analyzing the received-signal condition data received from each of the plurality of fixed stations to store statistical condition data at each of the fixed stations in a statistical condition memory;
a mobile-station movement estimator for estimating a future location of the mobile station based on detected current locations of the mobile station and the predetermined locations of the fixed stations; and
a parameter controller for controlling radio parameters for use in radio communication between the mobile station and a base station corresponding to the future location of the mobile station based on statistical condition data at the future location of the mobile station.
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Accused Products
Abstract
A radio-parameter control method allowing fine radio-parameter setting to improve communication quality is disclosed. Fixed stations are distributed at predetermined locations in a service area. A fixed station monitors reception condition of a pilot channel signal and transmits the monitored condition data back to a corresponding base station. A radio network control station statistically analyzes the monitored condition for each fixed station and estimates a future location of a mobile station. Radio parameters for use in radio communication between the mobile station and a base station corresponding to the future location of the mobile station are controlled based on statistical condition data at the future location of the mobile station.
78 Citations
11 Claims
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1. A system for controlling radio parameters for use in radio communication between a base station and a mobile station, comprising:
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a plurality of mobile stations, each of which has a position detector for detecting a current location of its own;
a plurality of base stations each forming a plurality of radio zones, in which a mobile station is allowed to communicate with a corresponding base station, wherein each of the base stations periodically transmits a down-link reference signal;
a plurality of fixed stations, which are distributed at predetermined locations in a service are a composed of the plurality of radio zones, wherein each of the fixed stations receives the down-link reference signal from a corresponding base station to produce received-signal condition data of the down-link reference signal;
a statistical analyzer for statistically analyzing the received-signal condition data received from each of the plurality of fixed stations to store statistical condition data at each of the fixed stations in a statistical condition memory;
a mobile-station movement estimator for estimating a future location of the mobile station based on detected current locations of the mobile station and the predetermined locations of the fixed stations; and
a parameter controller for controlling radio parameters for use in radio communication between the mobile station and a base station corresponding to the future location of the mobile station based on statistical condition data at the future location of the mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9)
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8. A method for controlling radio parameters for use in radio communication between a base station and a mobile station in a mobile radio communication system comprising:
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a plurality of mobile stations, each of which has a position detector for detecting a current location of its own;
a plurality of base stations each forming a plurality of radio zones, in which a mobile station is allowed to communicate with a corresponding base station, wherein each of the base stations periodically transmits a down-link reference signal; and
a plurality of fixed stations, which are distributed at predetermined locations in a service area composed of the plurality of radio zones, wherein each of the fixed stations receives the down-link reference signal from a corresponding base station to produce received-signal condition data of the down-link reference signal, wherein the method comprises;
a) receiving the current location of the mobile station;
b) receiving the received-signal condition data of the down-link reference signal from each of the fixed stations;
c) statistically analyzing the received-signal condition data to store statistical condition data at each of the fixed stations in a statistical condition memory;
d) estimating a future location of the mobile station based on detected current locations of the mobile station and the predetermined locations of the fixed stations; and
e) controlling radio parameters for use in radio communication between the mobile station and a base station corresponding to the future location of the mobile station based on statistical condition data at the future location of the mobile station.
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10. A mobile radio communications system comprising:
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a plurality of mobile stations, each of which has a position detector for detecting a current location of its own;
a plurality of base stations each forming a plurality of radio zones, in which a mobile station is allowed to communicate with a corresponding base station, wherein each of the base stations periodically transmits a down-link reference signal;
a plurality of fixed stations, which are distributed at predetermined locations in a service area composed of the plurality of radio zones, wherein each of the fixed stations receives the down-link reference signal from a corresponding base station to produce received-signal condition data of the down-link reference signal; and
a radio network control station accommodating the mobile stations, the base stations and the fixed stations, wherein the radio network control station comprises;
a statistical analyzer for statistically analyzing the received-signal condition data received from each of the plurality of fixed stations to store statistical condition data at each of the fixed stations in a statistical condition memory;
a mobile-station movement estimator for estimating a future location of the mobile station based on detected current locations of the mobile station and the predetermined locations of the fixed stations; and
a parameter controller for controlling radio parameters for use in radio communication between the mobile station and abase station corresponding to the future location of the mobile station based on statistical condition data at the future location of the mobile station.
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11. A program instructing a computer to control radio parameters for use in radio communication between a base station and a mobile station in a mobile radio communication system comprising:
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a plurality of mobile stations, each of which has a position detector for detecting a current location of its own;
a plurality of base stations each forming a plurality of radio zones, in which a mobile station is allowed to communicate with a corresponding base station, wherein each of the base stations periodically transmits a down-link reference signal; and
a plurality of fixed stations, which are distributed at predetermined locations in a service area composed of the plurality of radio zones, wherein each of the fixed stations receives the down-link reference signal from a corresponding base station to produce received-signal condition data of the down-link reference signal, wherein the program comprises the steps of;
a) receiving the current location of the mobile station;
b) receiving the received-signal condition data of the down-link reference signal from each of the fixed stations;
c) statistically analyzing the received-signal condition data to store statistical condition data at each of the fixed stations in a statistical condition memory;
d) estimating a future location of the mobile station based on detected current locations of the mobile station and the predetermined locations of the fixed stations; and
e) controlling radio parameters for use in radio communication between the mobile station and a base station corresponding to the future location of the mobile station based on statistical condition data at the future location of the mobile station.
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Specification