JP2880962B2 - Mobile communication base station capable of omni transmission / reception in a sector configuration - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, and more particularly, to a mobile communication base station which enables omni transmission and reception in a sector configuration.

[0002]

2. Description of the Related Art There are an omni cell and a sector cell in a cell configuration in a cellular mobile communication. In the case of the sector configuration, the base station has directional antennas for the number of sectors, and different frequencies are allocated to the base stations, so that the frequency per base station increases. However, the frequency usage efficiency can be higher than the omni configuration due to traffic volume and repetitive arrangement. For,
Today, the sector configuration is mainly employed.

[0003] The omni configuration is more advantageous when starting a new service (data communication or the like) in which the frequency per one base station is sufficient even if it is not sectorized and the increase in traffic cannot be predicted for the time being. It is. In the case of the omni configuration, an omnidirectional antenna is usually used. In order to perform omni transmission / reception with an existing base station having a current sector configuration, Japanese Patent Application Laid-Open Nos.
As disclosed in Japanese Unexamined Patent Publication No. 0622, there is a method in which an omni cell is superimposed on a sector cell by newly providing a non-directional antenna.

[0004]

In the prior art, enormous capital investment is required to newly install an omni-directional antenna in order to overlap a sector cell and an omni cell for efficient use of frequency.

An object of the present invention is to realize a mobile communication base station capable of performing an operation equivalent to an omni configuration without enormous capital investment using existing equipment having a sector configuration.

[0006]

SUMMARY OF THE INVENTION A mobile communication base station capable of omni transmission / reception in a sector configuration according to the present invention is a base station arranged in an area divided into a plurality of sectors, and is moved by a directional antenna of each sector. A transmission / reception unit for transmitting / receiving a signal to / from a device, and a relay control unit for performing signal relay and bus control between the transmission / reception unit and the control station, wherein the transmission / reception unit is configured to receive another signal when receiving a signal from the mobile device. Arbitrates with the transmitting / receiving unit to determine a master transmitting / receiving unit and a slave transmitting / receiving unit. The master transmitting / receiving unit creates an echo signal for a received signal from a mobile device, transfers the echo signal to the slave transmitting / receiving unit, and transmits the echo signal to the slave transmitting / receiving unit. The relay control unit operates a transmission destination and a transmission source address of a signal format between the transmission / reception unit and a control station. A function to show the multiple transmit and receive portions of data number of the control station to a single transceiver.

In the present invention, the transmission / reception unit in the sector-structured base station can communicate only with mobile stations in a specific sector. Therefore, in order to perform transmission and reception equivalent to the omni configuration, when transmitting to the mobile device, the transmitting and receiving unit of each sector transmits the same signal from the control unit at the same frequency,
At the time of reception from the mobile station, the transmission / reception unit of the sector that has been normally received is the master, the transmission / reception unit of the other sector is the slave, and only the master transmission / reception unit performs reception, and an echo signal indicating that the slave transmission / reception unit is receiving. And causes the slave transmitting / receiving section to transmit an echo signal.

Also, in order to make the control station think that one specific transmitting / receiving section is communicating with the mobile station,
The relay control unit operates the transmission destination and the transmission source address of the signal format, converts the signal from the control station to the specific transmission / reception unit into the signal to the transmission / reception units of all the sectors, and transmits the signal from the unspecified transmission / reception unit to the control station. Is converted into a signal from a specific transmitting / receiving unit.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing one embodiment of the present invention. The base station 10 has a directional antenna 11 of each sector,
The transmission / reception units 12 and 13 transmit / receive signals to / from the mobile device, and the transmission / reception units 1 to 3 and the relay control unit 4 which relays signals between control stations and performs bus control.
The signal bus 5 is a bus through which signals are relayed between the transmitting and receiving units 1 to 3 and the relay control unit 4 and the control station, and the signal line 6 between the transmitting and receiving units is a signal used for arbitration between the transmitting and receiving units 1 to 3. Line.

FIG. 2 is a diagram showing a configuration example of a sector cell. The base station 10 is located at the center of the sector-divided area, and is controlled by the directional antennas 11 to 13 in the sector zone 2.
It communicates with the mobile devices 20, 22, 23. Mobile device 20
Are located in the sector zone 21.

FIG. 3 shows an example of a signal format between the transmission / reception unit, the relay control unit, and the control station. FIG. 4 shows an example of a signal format between the base station and the mobile station.

The operation will be described on the assumption that the mobile station 20 is located in the sector zone 21 of the area having three sectors as shown in FIG. Transmitter / receiver 1
All 3 transmit and receive at the same frequency. The signal from the mobile device 20 is received by the transmission / reception unit 1 by the directional antenna 11. If the signal is normally received by the error detection decoding, the transmission / reception unit 1
Notifies the transmission / reception units 2 and 3 of being a master candidate via the transmission / reception unit signal line 6 and transmits information such as a reception level and an echo signal returned to the mobile device to the transmission / reception units 2 and 3 via the signal bus 5. When the mobile device 20 is near the sector boundary and received by a plurality of transmission / reception units and there are a plurality of master candidates, one master is selected by selecting the higher reception level.
Decide on one. Assuming that the transmission / reception unit 1 is a master and the transmission / reception units 2 and 3 are slaves, the master transmission / reception unit 1 transmits the echo signal created by itself, and
Transmits an echo signal from the master transmission / reception unit 1 and prohibits signal transmission from mobile devices other than the mobile device 20 in all sector zones. When all the signals have been received, the transmitting / receiving unit 1 releases the master / slave relationship with the transmitting / receiving units 2 and 3 and transmits the received signal to the control station. At this time, the transmission source address of the signal format is “transmission / reception unit 1”, but if the control station recognizes, for example, “transmission / reception unit 2”, the relay control unit 4 sets the transmission source address to “transmission / reception unit 2”.
And transmit it to the control station.

[0013] A signal transmitted to the mobile station 20 is transmitted from the control station to the base station as the "transmitter / receiver 2" if the control station recognizes the "transmitter / receiver 2". , The relay control unit 4 converts the transmission destination address into “transmission / reception units 1, 2 and 3”, and the transmission / reception units 1 to 3 receive this signal and transmit it to each sector. The mobile device 20 receives the signal transmitted by the transmission / reception unit 1.

As described above, the transmitting and receiving units 1 to 3 of each sector transmit the same signal, and return the echo signal as if the transmitting and receiving unit which is not actually receiving is also receiving the signal due to the reception arbitration. By operating the source and destination addresses of the signal format between the transmitting / receiving unit and the control station, an operation equivalent to the omni configuration can be performed. If the traffic volume increases in the future, the equipment can be easily changed to the sector configuration because the equipment has the sector configuration.

[0015]

According to the present invention, the operation corresponding to the omni configuration can be performed with the equipment having the existing sector configuration, so that a huge amount of capital investment is not required and the sector configuration / omni configuration can be changed according to the traffic volume of the service. Selection is also possible, and there is an effect that the frequency can be effectively used.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a configuration example of a sector cell.

FIG. 3 is an example of a signal format between a transmission / reception unit, a relay control unit, and a control station.

FIG. 4 is an example of a signal format between a base station and a mobile device.

[Explanation of symbols]

 1, 2, 3 transmitting / receiving unit 4 relay control unit 5 signal bus 6 signal line between transmitting / receiving units 10 base station 11, 12, 13 directional antenna 20 mobile station 21, 22, 23 sector zone

Claims (1)

(57) [Claims] 1. A base station arranged in an area divided into a plurality of sectors, a transmitting / receiving section for transmitting / receiving a signal to / from a mobile station using a directional antenna of each sector, and a communication section between the transmitting / receiving section and a control station. A transmission / reception unit configured to perform signal relay and bus control, wherein the transmission / reception unit arbitrates with a transmission / reception unit of another sector when receiving a signal from the mobile station, determines a master transmission / reception unit and a slave transmission / reception unit, The unit has a function of creating an echo signal for a received signal from the mobile device, transferring the echo signal to the slave transmitting / receiving unit, and causing the slave transmitting / receiving unit to transmit the echo signal to the mobile device, and wherein the relay control unit includes the transmitting / receiving unit and a control station. A function to operate the transmission destination and transmission source address of the signal format between the control station and the control station so that a plurality of transmission / reception units corresponding to the number of sectors are made to be one transmission / reception unit. A mobile communication base station capable of omni transmission and reception in a sector configuration characterized by comprising: