JP2990145B2 - Wireless base station device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio base station equipped with a multicarrier radio.

[0002]

2. Description of the Related Art A radio base station apparatus has a range (cell) of a service area in which a call traffic (traffic) is set, and a mobile phone is used in the service area (particularly). Japanese Unexamined Patent Publication No. Hei.
-247168).

[0003] By the way, a mobile phone has a different traffic volume depending on a service area (urban area / depopulated area) and a time zone (day / night) where the wireless base station device is installed.

[0004] In urban areas and in the daytime, there is a tendency for high traffic, so that multiple carriers are required. Further, in order to use limited frequencies effectively, it is necessary for the radio base station apparatus to reduce the cell radius and to cope with the repetition of the used frequency with the surrounding radio base station apparatuses.

On the other hand, in a depopulated area or at night, the traffic tends to be low, so that relatively few carriers can cover the traffic. Furthermore, if the cell radius is increased, the number of installed and operated wireless base station devices can be reduced.

[0006]

However, in the conventional radio base station apparatus, the radio base station apparatus or a sector in the radio base station apparatus has a high level regardless of whether the traffic volume is high or low. It is fixedly designed for traffic and low traffic and uses dedicated hardware, so cell size switching is not possible with one wireless hardware, and cell size is dynamically switched over time. There is a problem that can not be.

Further, even if one radio base station apparatus goes down, there is a problem that a lost cell cannot be covered by an adjacent radio base station apparatus.

An object of the present invention is to provide a radio base station apparatus capable of performing operation by switching the range (cell) of a service area to be handled according to the level of call traffic (traffic). Is to do.

[0009]

In order to achieve the above object, a radio base station apparatus according to the present invention is a radio base station apparatus having a multi-carrier radio, wherein the multi-carrier radio is provided with a plurality of radios simultaneously. It is capable of communicating with mobile terminals, and operates by switching the size (cell) of a service area to be handled according to the level of traffic volume (traffic). The baseband unit and the radio unit And the baseband unit processes two different modulation / demodulation data, and has a switch. The switch is a radio base station as a higher-level device of a radio base station apparatus. It has a function of switching between two-carrier operation and one-carrier operation in accordance with information on the number of operating carriers (traffic information) from the station control device and the operation status of the adjacent radio base station device. The radio section modulates the modulation data from the baseband section with a plurality of quadrature modulators and outputs a modulation signal, and the RF mixer amplifier converts the modulation signal into a carrier, further amplifies power, and combines them. And outputs a transmission modulated wave, and has a switch, and turns on the switch at the time of low traffic (zone expansion), and the baseband unit transmits a plurality of quadrature modulators to the radio unit. It sends the same frequency as the modulation signal, Ma
The multi-carrier radio is capable of coping with one- carrier operation, and turns off the switch at the time of high traffic (zone reduction). The baseband unit transmits different frequencies and modulation signals to a plurality of quadrature modulators of the radio unit. delivery, Ma
The multi-carrier radio is capable of supporting the operation of two carriers.

[0010] In addition, the switch is provided in all radio base station apparatuses.
If is operating normally, enter normal operation information,
When a certain wireless base station device suffers a disaster,
Input the abnormal operation information, and
One of the multi-carrier radios is out of service
If the traffic is low, switch from the small cell to the large cell
It is designed to be operated with a lock .

[0011]

[0012]

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a schematic diagram illustrating a state in which operation information is obtained in a communication system using a radio base station apparatus according to an embodiment of the present invention.

In FIG. 1, a communication system according to the present invention includes an exchange a, a plurality of radio base station controllers b connected to the exchange a, and a plurality of radio base stations controlled by each radio base station controller b. It is constructed from the base station device c.

In FIG. 1, an exchange a controls communication between a fixed communication network and a mobile communication network. In mobile communication networks,
The exchange a controls the inside of the network in cooperation with the radio base station controller b and the plurality of radio base stations c.

The plurality of radio base station devices c communicate with an arbitrary mobile terminal, and each of the radio base station devices c
The switching station a constantly monitors operation information such as the traffic status of the switch.

[0018] The radio base station apparatus c according to the embodiment of the present invention.
Is a multi-carrier radio 1 as shown in FIGS.
5 to enable operation by switching the size (cell) of the service area range (cell) to be handled according to the level of the call traffic (traffic). c includes a multi-carrier radio device 15
It is possible to communicate with a plurality of mobile terminals at the same time, and is characterized in that it operates as shown in FIGS. 2 and 3 to switch the size of a cell.

That is, as shown in FIGS. 2 and 3, the radio base station apparatus c according to the embodiment of the present invention includes the multi-carrier radio 15 and the multi-carrier radio 1
Reference numeral 5 includes a wireless unit 1 and a baseband unit 2.

As shown in FIG.
The radio unit 1 performs RF amplification and modulation / demodulation processing of two different frequencies A and B, and the baseband unit 2
Processes two different modulation / demodulation data.

Further, the baseband unit 2 has a switch 3. The switch 3 of the baseband unit 2 receives information (traffic information) on the number of operating carriers from the radio base station controller b as a higher-level device of the radio base station c shown in FIG.
And 2 depending on the operation status of the adjacent wireless base station device c.
It has a function of switching between carrier operation and one-carrier operation, receives traffic information from the radio base station controller b, judges whether the traffic is high or low, and outputs a switch-off signal at the time of high traffic operation. At the time of traffic operation, a switch-on signal is output as needed.

Further, the radio section 1 of the multi-carrier radio 15 has a quadrature modulator 6 and a quadrature modulator 7, an RF mixer amplifier 9 and an R
An F mixer amplifier 10, a switch 8, a synthesizer 11,
It has a receiving circuit 12, a receiving circuit 13, and a distributor 14.

In the radio section 1 of the multi-carrier radio 15, the quadrature modulator 6 modulates the modulation data A from the baseband section 2 to output a modulation signal A, and the RF mixer amplifier 9 outputs the modulation signal A. A carrier wave having a frequency A is further amplified, and power is amplified to output a transmission modulation wave A.

Similarly, the modulation data B from the baseband unit 2 is modulated by the quadrature modulator 7 to output a modulation signal B, and the transmission modulation wave B is transmitted via the RF mixer amplifier 10.
Is output.

The synthesizer 11 receives the transmission modulation waves A and B of two different frequencies as inputs, and synthesizes and outputs to the output terminal 4.

The switch 8 is provided between the outputs of the quadrature modulators 6 and 7, and is turned on / off by a switch on / off signal input from the switch 3.

The radio unit 1 of the multi-carrier radio 15
Then, the reception modulation wave is input from the input terminal 5 and the
And outputs the demodulated data A at the receiving circuit 12 and the demodulated data B at the receiving circuit 13.

Next, the operation of the first embodiment of the present invention will be described. The high traffic operation shown in FIG. 2 corresponds to a small cell. The switch 3 of the multicarrier radio device 15 to which the high traffic information has been input outputs a switch-off signal to turn off the switch 8. The baseband unit 2 enables the modulation and demodulation data processing of a plurality of different frequencies A and B for the radio unit 1.

Also, at the time of low traffic operation shown in FIG. 3, it corresponds to a large cell. The switch 3 of the multi-carrier radio 15 to which the low-traffic information has been input outputs a switch-on signal to turn on the switch 8 as necessary. The baseband unit 2 enables the modulation / demodulation data processing of only the frequency A for the radio unit 1. At this time, since the RF outputs of the RF (high-frequency) mixer amplifiers 9 and 10 having the same amplitude and the same phase are combined, the transmission power is doubled (increased by 3 dB), and the cell can be made larger than at the time of high traffic. Become.

The operation at the time of high traffic operation shown in FIG. 2 will be specifically described. The RF mixer amplifier 9 and the RF mixer amplifier 10 in the radio section 1 of the multi-carrier radio 15 are described.
Are operated at the same amplitude and the same phase.

In the case of high traffic operation, the multi-carrier radio 15 performs two-carrier operation. The multi-carrier radio 15 corresponds to frequencies A and B.

The switch 3 inputs high traffic information and outputs a switch-off signal. The switch 8 receives a switch-off signal and is turned off. Baseband part 2
Processes the modulation and demodulation data of the frequencies A and B for the radio unit 1.

Explaining the flow of radio waves on the transmitting side, the quadrature modulator 6 receives the modulation data A from the baseband unit 2, modulates it, and outputs the modulation signal A. The RF mixer amplifier 9 uses the modulation signal A as a carrier of the frequency A, further amplifies the power, and outputs a transmission modulation wave A.

The quadrature modulator 7 includes a baseband unit 2
Modulation data B is input and modulated to output a modulation signal B. The RF mixer amplifier 10 converts the modulated signal B into a carrier having a frequency B, further amplifies the power, and outputs a transmission modulated wave B.

The synthesizer 11 includes RF mixer amplifiers 9 and 10
, And outputs the combined modulated waves A and B to the output terminal 4. The transmission power at this time is, for example, 0 dBm / carrier.

On the other hand, the flow of radio waves on the receiving side will be described.
The distributor 14 inputs the received modulated wave from the input terminal 5 and distributes and outputs the modulated wave.

The receiving circuit 12 receives the received modulated wave from the distributor 14 and outputs demodulated data A.
Receives demodulated data from the distributor 14 and outputs demodulated data B. The baseband unit 2 processes the demodulated data A and B.

Next, the low traffic operation shown in FIG. 3 will be described. In the case of the low traffic operation, the multi-carrier radio 15 performs one carrier operation. The multi-carrier radio 15 supports only the frequency A.

The switch 3 inputs low traffic information and outputs a switch-on signal. The switch 8 receives a switch-on signal and is turned on. Baseband part 2
Processes the modulation / demodulation data of only the frequency A for the radio unit 1.

Explaining the flow of radio waves on the transmitting side, the quadrature modulator 6 receives the modulation data A from the baseband unit 2, modulates it, and outputs the modulation signal A. Modulation signal A
Are supplied to the RF mixer amplifiers 9 and 10 because the switch 8 is on.

The RF mixer amplifiers 9 and 10 receive the modulated signals A in phase with each other, use the same modulated signal as a carrier of frequency A, further amplify the power, and output the transmitted modulated waves A, respectively.

The combiner 11 receives two transmission modulated waves A and combines them. Therefore, the transmission modulation wave A that is synthesized and output is higher than that in the high traffic operation.
The transmission power is doubled and output to the output terminal 4. At this time, the transmission power is +3 dBm / carrier.

On the other hand, the flow of radio waves on the receiving side will be described.
The distributor 14 inputs the received modulated wave from the input terminal 5 and distributes and outputs the modulated wave. The receiving circuit 12 receives the received modulated wave, outputs demodulated data A, and processes the demodulated data A in the baseband unit 2.

The radio base station apparatus c according to the first embodiment of the present invention includes a receiving wave (uplink radio wave) input from the mobile terminal and a transmission wave (downlink radio wave) output to the mobile terminal when switching the cell size. ) Must be designed to keep the uplink / downlink constant at all times.

For example, when the radio base station device c switches to the large cell while communicating with the mobile terminal in the small cell state, the transmission system performs transmission power control so as to attenuate the downlink power to the mobile terminal. The receiving system instructs the mobile terminal to transmit the same transmission power as in the case of the small cell.

On the other hand, when switching to a small cell during communication with a mobile terminal in a small cell in the large cell state, the transmitting system amplifies the downlink power to the mobile terminal, and the receiving system transmits the signal to the mobile terminal. The same transmission power instruction as in the large cell is issued.

In particular, in the receiving system, if a receiving circuit corresponding to a large cell is used in advance, even if the cell is enlarged, a problem such as a deterioration in communication quality caused by a deterioration in reception sensitivity does not occur. However, the received electric field input (RSSI) information causes a malfunction of the weighting diversity of the receiver and the handover, and therefore, an offset of 3 dB is applied when the cell size is switched.

(Embodiment 2) FIG. 4 is a configuration diagram showing Embodiment 2 of the present invention. Embodiment 2 of the present invention shown in FIG.
Is intended to cover a missing service area. The configuration of the wireless base station device c according to the second embodiment of the present invention is the same as that shown in FIGS.

FIG. 4A shows a normal communication state.
It is a figure which shows the case where each radio | wireless base station apparatus performs small cell operation | movement, (b) is a figure which shows the case where operation | movement is performed in the state where the area which was lost due to the system down at the time of disaster occurs. FIG. 9 is a diagram showing a case where adjacent wireless base station apparatuses cover an area and operate in the second embodiment of the present invention.

In FIG. 4, a radio base station device c constitutes a cell. As shown in FIG. 4A, normally, each radio base station apparatus c operates in correspondence with a small cell.

As shown in FIG. 4B, at the time of disaster, a specific radio base station device (blank portion) c 'goes down,
Missing service areas occur.

When the system as shown in FIG. 4 (b) goes down and a missing service area occurs, as shown in FIG. 4 (c), in the second embodiment of the present invention, the radio base station apparatus c which has gone down is shown in FIG. ', Each wireless base station device c
Modify the range of cells individually to cover missing service areas.

That is, the exchange a shown in FIG. 1 constantly monitors the operation information of each radio base station c.

The switch 3 inputs the normal operation information when all the radio base station devices c are operating normally, and when a certain radio base station device c is down due to a disaster or the like, the switch 3 becomes abnormal. Enter operational information.

In the second embodiment of the present invention, if a disaster occurs, the sector to which the switch 3 belongs is located in the direction of the adjacent radio base station apparatus c which is down and the switch is present. Multicarrier radio 15 to which 3 belongs
If either carrier A or B is out of service,
Switch from small cell to large cell and operate with low traffic.

Thus, even if one radio base station apparatus goes down, it is possible to contribute to the coverage of the service area by enlarging the cell of the adjacent radio base station apparatus.

[0057]

As described above, according to the present invention, the operation is performed by switching the range (cell) of the service area to be handled according to the level of the traffic volume (traffic) according to the level of the traffic. The size switching can be handled by one wireless hardware.

Further, the traffic information is input as needed to determine the level of the traffic, and a switch on / off signal is output as necessary, and the switching is performed based on the signal. Can respond to ever-changing telephone needs.

Further, since the radio base station apparatus is always managed by the exchange, even if one radio base station apparatus goes down, the cell of the adjacent radio base station apparatus can be enlarged to increase the service area. Can contribute to the cover.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a state in which operation information is obtained in a communication system using a wireless base station device according to an embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating a high traffic operation.

FIG. 3 is a configuration diagram illustrating a low traffic operation.

FIG. 4A is a diagram illustrating a normal communication state in which each wireless base station device operates in a small cell;
(B) is a diagram illustrating a case where operation is performed in a state where an area that has been lost due to a system failure at the time of a disaster occurs, and (c) illustrates a case where an adjacent wireless base station apparatus changes the area in the second embodiment of the present invention. It is a figure showing the case where operation is performed by covering.

[Explanation of symbols]

 Reference Signs List 1 radio section 2 baseband section 3 switch 4 output terminal 5 input terminal 6 quadrature modulator 7 quadrature modulator 8 switch 9 RF mixer amplifier 10 RF mixer amplifier 11 synthesizer 12 reception circuit 13 reception circuit 14 distributor 15 multicarrier radio a Exchange b wireless base station controller c wireless base station

Claims (2)

(57) [Claims] 1. A radio base station apparatus having a multi-carrier radio, wherein the multi-carrier radio is capable of communicating with a plurality of mobile terminals at the same time, and responds to a high / low call volume (traffic). The operation is performed by switching the size (range) of the service area range (cell) to be handled, and has a baseband unit and a radio unit. The baseband unit processes two different modulation / demodulation data. And a switch, wherein the switch includes information (traffic information) on the number of operating carriers from a radio base station controller as a higher-level device of the radio base station and an adjacent radio base station The radio unit has a function of switching between two-carrier operation and one-carrier operation according to the operation status of the radio wave. The radio unit modulates from the baseband unit with a plurality of quadrature modulators. And it outputs the modulation signal over the modulation to over data,
The RF mixer amplifier converts the modulated signal into a carrier wave, further amplifies the power, combines them, and outputs a transmission modulated wave. The switch has a switch, and the switch is turned on during low traffic (zone expansion). the baseband unit sends out a modulated signal with the same frequency for a plurality of quadrature modulators of the radio unit, multicarrier
The carrier radio can support the operation of one carrier, and turns off the switch at the time of high traffic (zone reduction), and the baseband unit transmits different frequencies and modulation signals to a plurality of quadrature modulators of the radio unit. And multi
A radio base station apparatus, wherein the carrier radio is capable of operating with two carriers. 2. The switching device according to claim 1, wherein all the radio base station devices are
If the operation is normal, enter the normal operation information and
Radio base station equipment suffers disaster, etc.
Then, the abnormal operation information is input, and any one of the multi-carrier radios to which the switch belongs belongs.
From small cells to large cells when some carriers are out of service
2. The radio base station apparatus according to claim 1, wherein the radio base station apparatus is switched to operate with low traffic .