Radio link control method for a mobile telecommunications system

Assignee: NEC Corp

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Filing: 1994-12-14

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Granted: —

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Expires: 2014-12-14

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Abstract

Abstract In a cellular mobile telecommunications system, a radio link control method provides each base station with an antenna whose directivity is adaptively controllable on a mobile station basis. The base station communicates with a plurality of mobile stations by using the same frequency at the same time. The base station selects, among transmitters/receivers thereof which are in communication, two transmitters/receivers using the same frequency, detects the main beam directions of antenna directivities thereof, and then compares a difference between the main beam directions and a predetermined threshold. If the former is smaller than the latter, the base station executes handover so as to replace the frequency being used by one of the transmitters/receivers with another frequency. The method allows a single base station to use the same frequency twice or more while preventing interference from occurring within the base station. Alternatively or in addition the base station assigns or reassigns potentially interfering frequencies so as to maintain the angular velocities of the main beam directions the same or similar.

Inventors

👤 Toshihito C/O Nec Corporation Kanai

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-02 20:41

CPC Classifications

H; H04; H04W; H04W16/00; H04W16/24; H04W16/28

Claims Analysis

Total Claims: 4

Claim 1

Independent Claim 161 words

A radio link control method for a mobile telecommunications system comprising a plurality of base stations each being situated at a respective radio zone, and a plurality of mobile stations capable of communicating with said plurality of base stations, said plurality of base stations each communicating, by use of an antenna which adaptively sets up particular antenna directivity for each of said plurality of mobile stations, with two or more of said plurality of mobile stations at the same time by using frequencies which are apt to interfere with each other, said method comprising the steps of: detecting a main beam direction of antenna directivity set up on a mobile station basis; and assigning or reassigning frequencies to mobile stations so as to maintain an angle between main beam directions of antennas using potentially-interfering frequencies at not less than a predetermined value, and/or so as to maintain the rate of change of said angle at nor more than a predetermined value.

Claim 2

Dependent Claim 168 words

A radio link control method for a mobile telecommunications system comprising a plurality of base stations each being situated at a respective radio zone, and a plurality of mobile stations capable of communicating with said plurality of base stations, said plurality of base stations each communicating, by use of an antenna which adaptively sets up particular antenna directivity for each of said plurality of mobile stations, with two or more of said plurality of mobile stations at the same time by using frequencies which are apt to interfere with each other, said method comprising the steps of: detecting a main beam direction of antenna directivity set up on a mobile station basis; and switching, when a difference in angle between main beam directions of two antenna directivities using frequencies which are apt to interfere with each other at the same time decreases to below a predetermined value, the mobile station using one of the two antenna directivities to a channel of a frequency which is free from interference.

Claim 3

Dependent Claim 188 words

A radio link control method for a mobile telecommunications system comprising a plurality of base stations each being situated at a respective radio zone, and a plurality of mobile stations capable of communicating with said plurality of base stations, said plurality of base stations each communicating, by use of an antenna which adaptively sets up particular antenna directivity for each of said plurality of mobile stations, with two or more of said plurality of mobile stations at the same time by using frequencies which are apt to interfere with each other, said method comprising the steps of: detecting, in the event of assigning a channel to one of the plurality of base stations which requests a communication, a difference in angle between a main beam direction of antenna directivity for the base station requesting a communication and a main beam direction of antenna directivity for each of the other mobile stations communicating at the same time by using frequencies which are apt to interfere with said channel, and allowing said base station requesting a communication to use said channel if said difference is larger than a predetermined value.

Claim 4

Dependent Claim 140 words

A radio link control method for a mobile telecommunications system comprising a plurality of base stations each being situated at a respective radio zone, and a plurality of mobile stations capable of communicating with said plurality of base stations, said plurality of base stations each communicating, by use of an antenna which adaptively sets up particular antenna directivity for each of said plurality of mobile stations, with two or more of said plurality of mobiel stations at the same time by using frequencies which are apt to interfere with each other, said method comprising the steps of: detecting angular velocity of main beam directions of antenna directivities for the mobile stations in communication, and switching channels such that the mobile stations having the same or similar angular velocity use frequencies apt to interfere with each other at the same time.

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