Base transceiver station and subscriber unit in wireless local loop system using personal handy-phone system and method for operating same

A base transceiver station in a wireless local loop system using a mobile communication system operated under a time division duplex (TDD) mode, comprising:

• a plurality of cell stations for accommodating subscriber units each comprising a plurality of terminals and
• a hybrid section comprising a multistage power combiner which is arranged between said plurality of cell stations and a single transmitting and receiving antenna and which combines the transmitting powers from the plurality of cell stations and feeds the combined power to said transmitting and receiving antenna, a multistage power distributor which distributes the power received from said transmitting and receiving antenna to said plurality of cell stations, and a time division duplex (TDD) switch which alternately switches said transmitting and receiving antenna between transmission use and reception use based on the time division duplex (TDD) mode,
• said base transceiver station being provided with
• a common transmitting amplifier which operates in a time division multiple access (TDMA) mode in which said plurality of cell stations occupy channels individually allocated for every time slot and which is provided on the output side of said multistage power combiner common to said plurality of cell stations, and
• a common receiving amplifier provided on the input side of said multistage power distributor common with respect to said plurality of cell stations, and where
• the base transceiver station further includes a bias changing means which gives a bias of a level in proportion to the number of said channels in use for every said time slot to at least one amplifier between said common transmitting amplifier and said common receiving amplifier.

A base transceiver station in a wireless local loop system using a mobile communication system operated under a time division duplex (TDD) mode, comprising:

• a plurality of cell stations for accommodating subscriber units each comprising a plurality of terminals and
• a hybrid section comprising a multistage power combiner which is arranged between said plurality of cell stations and a single transmitting and receiving antenna and which combines the transmitting powers from the plurality of cell stations and feeds the combined power to said transmitting and receiving antenna and, a multistage power distributor which distributes the power received from said transmitting and receiving antenna to said plurality of cell stations, wherein
• said base transceiver station is provided with
• a common transmitting amplifier which operates in a time division multiple access (TDMA) mode in which said plurality of cell stations occupy channels individually allocated for every time slot and which is provided on the output side of said multistage power combiner common to said plurality of cell stations and
• a common receiving amplifier provided on the input side of said multistage power distributor common with respect to said plurality of cell stations and where
• the base transceiver station further includes a bias changing means which gives a bias of a level in proportion to the number of said channels in use for every said time slot to at least one amplifier between said common transmitting amplifier and said common receiving amplifier.

A base transceiver station in a wireless local loop system using a “personal handy-phone system” (PHS) provided with:

• a first base transceiver station including four cell stations each accommodating a plurality of subscriber units and a multiplexing/demultiplexing unit for multiplexing or demultiplexing digital signals transmitted and received between the cell stations and a subscriber exchange and
• a second base transceiver station, combined as one body with said first base transceiver station, which includes four cell stations each accommodating a plurality of subscriber units and transmits and receives digital signals between the cell stations and said subscriber exchange by commonly using said multiplexing/demultiplexing unit in said first base transceiver station,
• wherein in said first base transceiver station, one of said four cell stations is a master cell station handling control-use D-channel signals in addition to speech-use B-channel signals and the other three cell stations are slave cell stations transmitting and receiving the control-use D-channel signals by inter-processor communication with the master cell station;
• and
• in said second base transceiver station, one of said four cell stations is a master cell station handling control-use D-channel signals in addition to speech-use B-channel signals and the other three cell stations are slave cell stations transmitting and receiving the control-use D-channel signals by inter-processor communication with the master cell station.

A base transceiver station in a wireless local loop system using a “personal handy-phone system” (PHS), wherein the base transceiver station is connected to a public switched telephone network (PSTN) via interface converting equipment converting a protocol used in the existing public switched telephone network (PSTN) and a protocol used in the wireless local loop system between each other, wherein said interface converting equipment has:

• a first input/output unit connected to said wireless local loop system side;
• a second input/output unit connected to said public switched telephone network (PSTN) side;
• a switching unit inserted between said first input/output unit and the second input/output unit;
• a layer 2 terminating unit for terminating digital data from said wireless local loop system side obtained via the switching unit and digital data of each layer 2 from said public switched telephone network (PSTN) side;
• and
• a central processing unit (CPU) which processes the message of a layer 3 obtained at the layer 2 terminating unit, converts this to digital data of the layer 2 again, and transmits the resultant data to said public switched telephone network (PSTN) side and said wireless local loop system side opposing each other via said switching unit.

A method of operating a base transceiver station in a wireless local loop system using a “personal handy-phone system” (PHS) having

• a first base transceiver station having a plurality of cell stations each accommodating a plurality of subscriber units and a multiplexing/demultiplexing unit for multiplexing or demultiplexing digital signals transmitted and received between the cell stations and a subscriber exchange, and
• a second base transceiver station which has a plurality of cell stations each accommodating a plurality of subscriber units and commonly uses said multiplexing/demultiplexing unit in said first base transceiver station to transmit and receive digital signals between the cell stations and said subscriber exchange, wherein
• at least one of said plurality of cell stations is set as the master cell station (CS1) handling control-use D-channel signals in addition to speech-use B-channel signals and the remaining plurality of cell stations are set as slave cell stations (CS2, CS3, and CS4) controlled by the master cell station;
• and
• when a fault occurs in one said master cell station, the fault is covered by one of the remaining plurality of cell stations.

A base transceiver station in a wireless local loop system using a mobile communication system operated under a time division duplex (TDD) mode, comprising:

• a plurality of cell stations for accommodating subscriber units each comprising a plurality of terminals and
• a hybrid section comprising a multistage power combiner which is arranged between said plurality of cell stations and two transmitting and receiving antennas having a space diversity (SD) configuration and which combines the transmitting powers from the plurality of cell stations and feeds the combined power to one of said two transmitting and receiving antennas, a multistage power distributor which distributes the power received from one of said two transmitting and receiving antennas to said plurality of cell stations, a space diversity switch (SD·SW) which combines said transmitting powers toward one of said two transmitting and receiving antennas, and a time division duplex (TDD) switch which alternately switches said one transmitting and receiving antenna between transmission use and reception use based on the time division duplex (TDD) mode,
• wherein said base transceiver station is provided with a plurality of transmitting amplifiers for every plurality of said cell stations and where
• the base transceiver station further includes a transmission gain changing means which detects said transmitting power at the point nearest the input end of said transmitting and receiving antenna and gives a transmission gain in accordance with the result of detection to said transmitting amplifiers, said transmission gain is controlled by utilizing a reception cycle.

A base transceiver station in a wireless local loop system using a mobile communication system operated under a time division duplex (TDD) mode, comprising:

• a plurality of cell stations for accommodating subscriber units each comprising a plurality of terminals and
• a hybrid section comprising a multistage power combiner which is arranged between said plurality of cell stations and a single transmitting and receiving antenna and which combines the transmitting powers from the plurality of cell stations and feeds the combined power to said transmitting and receiving antenna, a multistage power distributor which distributes the power received from said transmitting and receiving antenna to said plurality of cell stations, and a time division duplex (TDD) switch which alternately switches said transmitting and receiving antenna between transmission use and reception use based on the time division duplex (TDD) mode,
• said base transceiver station is provided with a plurality of transmitting amplifiers for every plurality of said cell stations and where
• the base transceiver station further includes a transmission gain changing means which detects said transmitting power at the point nearest the input end of said transmitting and receiving antenna and gives a transmission gain in accordance with the result of detection to said transmitting amplifiers, said transmission gain is controlled by utilizing a reception cycle.