JPH04156116A - System for constituting radio zone adaptable to communication traffic - Google Patents

Abstract

PURPOSE:To always supply an optimum line capacity in accordance with complicated communication traffic variance by automatically switching the size of a radio zone in accordance with the communication traffic variance. CONSTITUTION:A service area is divided into radio zones different in size so that they overlap, and radio base stations 2 and 3 are provided in each radio zone. A radio line control station 1 stores inputted communication traffic data in a corresponding part of a storage means 11 and successively compares a preliminarily set allowable value with stored communication traffic data. An operation start signal is sent to stopping radio base stations to start the operation, and the radio zone of radio base stations whose operation is stopped is automatically switched to a radio zone having a preliminarily determined size out of radio zones different in size. Thus, the optimum line capacity is always supplied in accordance with complicated communication traffic variance.

Description

[Detailed Description of the Invention] [Summary] For example, regarding a communications 1 rough traffic adaptive wireless zone configuration system used in a car telephone system, it is possible to always supply an appropriate line capacity in response to complex communications traffic fluctuations. The service area is defined in a mobile communication system that includes a radio network control station, a radio base station connected to the radio network control station, and a mobile device connected to the radio base station via a radio link. Overlapping and dividing radio zones of different sizes, providing the radio base station for each radio zone, communication traffic measuring means for measuring communication traffic in each radio base station, storage means in the radio line control station, A comparison means and an instruction signal generation means are provided, and the operating wireless base station
Measuring communication traffic using rough measurement methods 1
The communication traffic data is sent to the radio network control station every hour, and the radio network control station stores the input communication traffic data in the corresponding part of the storage means, and stores the communication traffic data along with the preset tolerance value. The data are sequentially compared, and when it is detected that the signal is outside the tolerance value for a predetermined period of time, the operation 1 stop signal generated by the instruction signal generating means is detected to be outside the tolerance value for a certain period of time. The wireless base station transmits communication traffic data to the wireless base station that sent it to stop its operation, and also sends an operation start signal to the idle wireless base station to start its operation and stop its operation. The wireless zone of the wireless base station is configured to automatically switch to a wireless zone of a predetermined size among the wireless zones of different sizes.

[Industrial application field]

TECHNICAL FIELD The present invention relates to a communication traffic adaptive radio zone configuration scheme for use, for example, in a mobile telephone system.

In recent years, car phones and mobile phones have become extremely popular. In addition, the concentration of information (urbanization) is becoming more pronounced, and communication traffic is also increasing significantly.However, systems are unable to cope with this and there are many situations where communication lines are blocked. are doing.

Originally, the system was designed to determine the line capacity based on predictions to be able to cope with increased communication traffic, but in reality there are cases where the capacity exceeds predictions (for example, during disasters, traffic shutdowns, etc.). Occurs often. Furthermore, the dense portion of communication traffic moves over time.

Due to these complex factors, it is difficult to optimally design the communication capacity of a system in consideration of cost, profitability, etc.

However, as a car telephone system, it is necessary to always be able to supply optimal line capacity in response to complex fluctuations in communication traffic.

[Conventional technology]

FIG. 7 is an example of a conventional radio base station arrangement diagram, and FIG. 8 is an example of a communication traffic distribution diagram for a car telephone.

First, in a car phone system, the service area is divided into multiple wireless zones, and the size of each wireless zone is determined by considering radio wave propagation characteristics9, frequency usage efficiency, mobile device transmission power, etc. .

Normally, to increase the efficiency of frequency use, narrow the line spacing and geographically repeat the same frequency, but in car phone systems that use many lines, the wireless zone should be made smaller (and closer to each other). The same frequency is used repeatedly.

Additionally, a wireless base station is established for each wireless zone.
Each radio base station relays signals between mobile devices within its own radio zone and a radio network control station.

Now, FIG. 7(a) shows a large zone configuration for a small to medium-sized city where communication traffic is sparse, and the radius of the large zone is, for example, 10 to 20 km.

However, in the case of heavy-duty areas where communication traffic is dense, the number of mobile devices is larger (and the number of lines is correspondingly larger) than in small and medium-sized cities. By using a small zone with a small area of the wireless zone, the appearance is good and the number of frequencies used is increased.The radius of the small zone is selected to be several kilometers, for example, so the wireless base station The number of zones is larger than in the case of large zones.

In addition, as shown in Figure 7 (C), a mixed configuration of a large zone and a small zone can be seen, but the area of the small zone (corresponding to the shaded area in Figure 8) has a higher level of communication than the surrounding area. The area is densely trafficked.

Here, A-P in FIG. 7 is a large zone radio base station, a
-n each indicates a small zone wireless base station. Also,
The wireless zone is originally circular, but has been changed to a hexagonal shape to make it easier to see.

[Problem to be solved by the invention]

Nowadays, due to natural disasters and other events, communication traffic increases from time to time, and one line is often blocked. It happens.

Furthermore, if the wireless zone is changed from a large zone to a small zone because there is a lot of communication traffic during the day, call traffic fluctuates between day and night, which lowers the operating rate of equipment and increases costs.

Furthermore, as shown in Figure 8, even if we create a small zone structure (shaded area) for areas with high current9 communication traffic, areas with high communication traffic will move due to population shifts and new road construction. It is predicted that there will be cases where this will not be possible, in which case the equipment will have to be replaced.

In other words, since the wireless zone of the current car telephone system is fixed, there is a problem that it cannot respond to fluctuations in communication traffic, and there is a high possibility that line blockages will occur and costs will increase.

An object of the present invention is to always be able to supply optimal line capacity in response to complex communication traffic fluctuations.

[Means to solve problems]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, 1 is a radio network control station that monitors and controls connected radio base stations, and monitors the setting and switching of radio channels, and 2 is a radio network control station that sends and receives various signals in the radio section. 21 and 31 are communication traffic measuring means for measuring communication traffic.

Further, 11 is a storage means, 12 is a comparison means, and 13
is an instruction signal generating means.

In the first aspect of the present invention, the service area is divided into overlapping wireless zones of different sizes, and the wireless base station is provided for each wireless zone.

Furthermore, the operating radio base station measures communication traffic using the communication traffic measuring means and sends communication traffic data to the radio network control station every hour.

The radio network control station stores the input communication traffic data in a corresponding portion of the storage means, and sequentially compares the stored communication traffic data with a preset tolerance value.

At this time, when it is detected that the communication traffic data exceeds the permissible value for a predetermined period of time, the operation stop signal generated by the instruction signal generating means is sent to the wireless base that transmitted the communication traffic data that exceeds the permissible value. The signal is sent to the station to stop the operation.

On the other hand, an operation start signal is sent to the inactive wireless base station to start operation, and the wireless zone of the inactive wireless base station is divided into predetermined wireless zones of different sizes. It automatically switches to the wireless zone of the size.

In the second aspect of the present invention, the service area is divided into overlapping radio zones of two types: dog and small.

[Effect]

In the present invention, a service area is divided, for example, into two types of overlapping wireless zones, large and small, and the wireless base station is provided for each wireless zone. That is, a large zone radio base station and a small zone radio base station are provided.

It is also assumed that the large zone radio base station is in operation and the service area is covered by the large zone configuration.

Now, these large zone radio base stations measure communication traffic using the communication traffic measuring means and send communication traffic data to the radio line control station every hour.

The radio network control station stores the input communication traffic data in a corresponding portion of the storage means, and sequentially compares the stored communication traffic data with a preset tolerance value.

At this time, when it is detected that the communication traffic data is continuously equal to or greater than the permissible value for a predetermined period of time, an operation stop signal is sent from the instruction signal generating means, and the communication traffic data exceeding the threshold value is detected. Stop the operation of the radio base station that transmitted the data.

Furthermore, an operation start signal is sent to the inactive small zone radio base station to start its operation, and the radio zone of the inactive radio base station is switched to the small zone.

In addition, when the radio network control station detects that the communication traffic in the small zone configuration area has fallen below the allowable value for a predetermined period of time, it switches the small zone configuration area to the large zone configuration in the same way as above. Revert to configuration.

In other words, the size of the wireless zone can be automatically switched in response to changes in communication traffic. This makes it possible to always provide optimal line capacity in response to complex communication traffic fluctuations.

〔Example〕

FIG. 2 is a block diagram of an embodiment of the present invention, and FIG. 2(a)
is a block diagram of a radio network control station, and FIG. 2(b) is a block diagram of a radio base station. 3 is an explanatory diagram of the operation of FIG. 2, FIG. 4 is an example of a wireless base station layout diagram of the present invention, FIG. 5 is a diagram showing an example of temporal changes in communication traffic, and FIG. 6 is an illustration of the present invention. FIG. 3 shows a diagram illustrating an example of a wireless zone configuration of the invention.

Here, memory 111. in FIG. interface 11
2 is a component of the storage means 11, RAM 121. L threshold generation part 122. CPU 123 is comparison means 12
The instruction signal generation section 131 represents the instruction signal generation means 13. In addition, the interface 211. memory 2
12. CPU 213. A timer 214 represents a component of the communication traffic measuring means 21.

The operation of FIG. 2 will be described below with reference to FIGS. 3 to 6. The service area is divided into 12 overlapping wireless zones, large and tJ. Under normal conditions, the large zone configuration is used, but in areas where communication traffic has increased, the large zone configuration will be switched to the small zone configuration. shall be.

First, as shown in Fig. 4(a), there are two types of wireless base stations: one for large zones (marked with O in the figure) and one for small zones (marked with * in the figure). It is assumed that communication traffic is generally sparse and the wireless base stations marked with an O are in operation as shown in FIG. 4(a).

In addition, a wireless base station is connected to a wireless line control station by a wired transmission line (consisting of a telephone line and a control line). (not shown) is in the on state, and when the communication line and transmitter/receiver are in the off state, only the control line is in the on state.

Now, each radio base station in an operating state (see FIG. 2(a)) uses a built-in CPU 213 and a timer 214 to store in the memory 212 the number of call requests made every 73 hours.

Furthermore, if the other party is not busy in response to a call request, the line is connected and the call begins, so at this time another timer (not shown) is activated to measure the call time until the end of the call.

Then, using the measured call time, the line usage rate, which indicates how many hours out of the 11 hours were used for calls, is determined and stored in the memory 212 (see the left side of FIG. 3).

On the other hand, the CPU 123 of the radio network control station updates the T1 stored in the memory of the radio base station in the operating state in one hour period.
Data on the number of calls made and received each hour and line usage rate data are sequentially sent via the interface 112.

Collect and store in the corresponding part in the memory 111 (
(See Figure 3-■).

Then, the RAM 121 sequentially compares the preset threshold value (corresponding to the allowable value in the claims) from the threshold generation part 122 with the data of each wireless base station, and then A wireless base station that exceeds a threshold for a specified number of times (that is, corresponds to an area where communication traffic is dense) is detected.

Thereafter, the wireless line base station uses the instruction signal generation part 131 to send an operation stop instruction signal to the detected wireless base station, and changes the wireless zone of the large zone wireless base station that has stopped operating to a small zone. In order to switch, an operation start instruction signal is sent to the small zone wireless base station (Fig. 3-■~
■Reference).

As a result, as shown in FIG. 4(b), the wireless base station a
-h starts operation, and the area with high communication traffic becomes a small zone configuration.

If the call traffic in the area with the small zone configuration shown in FIG. 4(b) becomes sparse, the small zone configuration is switched to the large zone configuration using the same procedure as described above, resulting in the configuration shown in FIG. 4(al).

Next, the call traffic of a car telephone system changes over time. For example, as shown in FIG. 5(a), time t=
At time Ao, the areas with high communication traffic are indicated by dotted lines, but at time t=Ao+α, there are two dotted line areas as shown in FIG. 5(b).

By using the method of the present invention to deal with such changes in call traffic, the zone configuration in FIG.
As shown in the zone configuration of FIG. 9(b), it changes in response to changes in the distribution of 9 communication traffic.

That is, since large/small zone switching automatically follows changes in communication traffic distribution, the system changes to have the optimal line capacity at that time. Thereby, the equipment of the car telephone system can be used effectively without waste.

〔Effect of the invention〕

As described in detail above, the present invention has the advantage that optimal line capacity can always be supplied in response to complex communication traffic fluctuations.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of the principle of the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, Fig. 3 is an explanatory diagram of the operation of Fig. 2, and Fig. 4 is an example of a radio base station layout diagram of the present invention. , FIG. 5 is a diagram showing an example of the time change of communication traffic, FIG. 6 is a diagram showing an example of the wireless zone configuration of the present invention, and FIG. 7 is a diagram showing an example of the wireless zone configuration of the present invention.
The figure shows an example of a conventional radio base station layout diagram, and FIG. 8 shows an example of a communication traffic distribution diagram for a car phone. In the figure, (2) is a radio channel control station, 2.3 is a radio base station, 11 is a storage means, 12 is a comparison means, 13 is an instruction signal generation means, and 21 and 31 are communication traffic measurement means. Block country of Hasbass Kokabuto Akitai Zaj Block country No. 2 Section 2 Dynamics of Figure 2 Explanatory diagram % 3 Figure Time change of communication traffic -fllΣHossu No. 5
Threshold 1n6-

Claims (1)

[Claims] 1. A radio network control station (1), a radio base station (2, 3) connected to the radio network control station, and a mobile device connected to the radio base station via a radio link. The radio line control station monitors and controls the radio base station and monitors the setting and switching of radio lines, and the radio base station transmits and receives various signals in the radio section, and controls the radio line. By relaying signals between the station and the mobile device and monitoring the quality of the wireless line, the service area is divided into overlapping wireless zones of different sizes in a mobile communication system where the mobile device and the other party make calls. The wireless base station is provided for each wireless zone, and each wireless base station is provided with communication traffic measuring means (21, 31) for measuring communication traffic, and the wireless line control station is provided with a storage means (11) and a comparison means (12). , instruction signal generation means (13) are respectively provided, and the operating radio base station measures communication traffic with the communication traffic measurement means and transmits the communication traffic data to T.
The communication traffic data is sent to the radio network control station every time, and the radio network control station stores the input communication traffic data in the corresponding part of the storage means, and sequentially compares the stored communication traffic data with a preset tolerance value. However, when it is detected that the communication traffic data exceeds the permissible value for a predetermined period of time, the operation stop signal generated by the instruction signal generating means is transmitted to the wireless base that transmitted the communication traffic data that exceeds the permissible value. At the same time, it sends an operation start signal to the inactive wireless base station to cause it to stop operating, and sends an operation start signal to the inactive wireless base station to start operation, thereby expanding the wireless zone of the inactive wireless base station to the corresponding size. A communication traffic adaptive wireless zone configuration method characterized by automatically switching to a wireless zone of a predetermined size among different wireless zones. 2. The communication traffic adaptive wireless zone configuration method according to claim 1, wherein the service area is divided into two types of wireless zones, large and small, overlapping each other.