Mobile communication system comprising base stations each having omnidirectional antenna for reception of interference wave

Claim 2

A mobile communication system comprising: a plurality of base stations each having a plurality of sectors, each sector having an antenna and a plurality of communication channels previously allocated thereto; and a plurality of mobile stations each communicating with a neighboring base station through one of said communication channels; each base station further including, an omnidirectional receiving antenna other than said sector antennas, said omnidirectional receiving antenna configured to receive interference waves; a receiver coupled to said omnidirectional receiving antenna and configured to receive said interference waves through said omnidirectional receiving antenna on all communication channels previously allocated to said each base station in all directions to detect interference wave levels; sector receiving means for receiving a calling signal from one of said mobile stations through an antenna of one of said sectors to detect a carrier wave level for communication with said one of said mobile stations; estimating means for estimating a channel quality of each of unused communication channels of said communication channels previously allocated to said one of said sectors, based upon said detected interference wave levels and said detected carrier wave level; and channel designating means for designating one of said unused communication channels having an estimated channel quality satisfying a predetermined reference quality.

Claim 3

The mobile communication system as set forth in claim 1, wherein said receiver updates said interference wave levels at all times.

Claim 4

The mobile communication system as set forth in claim 1, wherein the omnidirectional antenna is provided at a top area of each of said base stations and said sector antennas are respectively provided at predetermined positions below said omnidirectional antenna.

Claim 5

The mobile communication system as set forth in claim 1, wherein more than one of said plurality of communication channels is allocated to a predetermined frequency in a time division multiplexed manner.

Claim 6

In a mobile communication system which includes a plurality of base stations each having a plurality of sectors, each sector having an antenna and a plurality of communication channels previously allocated thereto; and a plurality of mobile stations each communicating with a neighboring base station through one of said communication channels; a channel allocation method comprising the steps of: receiving interference waves through an omnidirectional antenna other than said sector antennas of each base station on all communication channels previously allocated to said each base station to detect interference wave levels in all directions; receiving a calling signal from one of said mobile stations through an antenna of one of said sectors to detect a carrier wave level for communication with said one of said mobile stations; estimating a channel quality of each of unused communication channels of the communication channels previously allocated to said one of said sectors receiving said calling signal, based upon said detected interference wave levels and said detected carrier wave level; and designating one of said unused communication channels having an estimated channel quality satisfying a predetermined reference quality.

Claim 7

In a mobile communication system which includes a plurality of base stations each having a plurality of sectors, each sector having an antenna and a plurality of communication channels previously allocated thereto; and a plurality of mobile stations each communicating with a neighboring base station through one of said communication channels; a channel allocation method comprising the steps of: receiving interference waves through an omnidirectional antenna other than said sector antennas of each base station on all communication channels previously allocated to said each base station to detect interference wave levels in all directions; receiving a calling signal from one of said mobile stations through an antenna of one of said sectors to detect a carrier wave level for communication with said one of said mobile stations; estimating a channel quality of each of unused communication channels of the communication channels previously allocated to said one of said sectors receiving said calling signal, based upon said detected interference wave levels and said detected carrier wave level; and designating one of said unused communication channels having an estimated channel quality satisfying a predetermined reference quality.

Claim 8

The channel allocation method as set forth in claim 5, wherein said step of designating a communication channel comprises the step of designating one channel in conformity with a predetermined selection order among said unused communication channels, each having an estimated channel quality satisfying said predetermined reference quality.

Claim 9

The channel allocation method as set forth in claim 5, wherein said step of designating a communication channel comprises the steps of: informing said one of said mobile stations of a candidate channel selected from said unused communication channels each having an estimated channel quality satisfying said predetermined reference quality; and designating said candidate channel as a channel for communication when a channel quality of said candidate channel detected by said one of said mobile stations satisfies a second predetermined reference quality.

Claim 10

The channel allocation method as set forth in claim 5, wherein more than one of said plurality of communication channels is allocated to a predetermined frequency in a time division multiplexed manner.

Claim 11

A mobile communication system comprising: a plurality of base stations each having a plurality of sector antennas for respectively providing coverage to a plurality of sectors, and a plurality of communication channels previously allocated to each of said sectors; and a plurality of mobile stations each communicating with a neighboring base station through one of said communication channels, each of said base stations further including, an omnidirectional antenna other than said sector antennas, for receiving interference waves in all directions; a receiver for receiving said interference waves through said omnidirectional antenna on all communication channels previously allocated to said each of said base stations to detect interference wave levels; sector communication means for communicating with one of said mobile stations, having a pair of a sector transmitter and a sector receiver for each of said sectors, said sector receiver configured to receive a calling signal from said one of said mobile stations and said sector transmitter configured to transmit a response to said calling signal, wherein said sector communication means detects a carrier wave level for communication with said one of said mobile stations; estimating means for estimating a channel quality of an unused communication channel of said communication channels previously allocated to one of said sectors from which said calling signal was sent from, based upon said interference wave levels and said carrier wave level; and channel designating means for designating an unused communication channel having said channel quality satisfying a predetermined reference quality.

Claim 12

A mobile communication system comprising: a plurality of base stations each having a plurality of sector antennas for respectively providing coverage to a plurality of sectors, and a plurality of communication channels previously allocated to each of said sectors; and a plurality of mobile stations each communicating with a neighboring base station through one of said communication channels, each of said base stations further including, an omnidirectional antenna other than said sector antennas, for receiving interference waves in all directions; a receiver for receiving said interference waves through said omnidirectional antenna on all communication channels previously allocated to said each of said base stations to detect interference wave levels; sector communication means for communicating with one of said mobile stations, having a pair of a sector transmitter and a sector receiver for each of said sectors, said sector receiver configured to receive a calling signal from said one of said mobile stations and said sector transmitter configured to transmit a response to said calling signal, wherein said sector communication means detects a carrier wave level for communication with said one of said mobile stations; estimating means for estimating a channel quality of an unused communication channel of said communication channels previously allocated to one of said sectors from which said calling signal was sent from, based upon said interference wave levels and said carrier wave level; and channel designating means for designating an unused communication channel having said channel quality satisfying a predetermined reference quality.

Claim 13

The mobile communication system as set forth in claim 9, wherein the omnidirectional antenna is provided at a top area of each of said base stations and said sector antennas are respectively provided at predetermined positions below said omnidirectional antenna.

Claim 14

The mobile communication system as set forth in claim 9, wherein more than one of said plurality of communication channels is allocated to a predetermined frequency in a time division multiplexed manner.