JP3481823B2 - Mobile communication system and its radio control device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile / mobile phone system and a simple mobile phone system (PHS; personal).
mobile communication system such as handyphone system) and its radio control device.

[0002]

2. Description of the Related Art In recent years, the installation and expansion of cellular mobile communication systems have been rapidly progressing with the increasing needs for mobile communication and the development of communication technology. This type of system has a plurality of base stations forming a radio zone called a cell and a mobile station connected to the base station via a radio line in the radio zone. Mobile stations can be accommodated within the range of traffic set for each zone.

By the way, recently, many telecommunications carriers provide public mobile communication services such as automobile / cell phone services, public PHS, and self-employed PHS. Many areas have overlapping service areas. In such areas, even if the traffic of a base station of a certain operator exceeds a specified value and transmission and reception cannot be performed via this base station, as long as the wireless section and network interface are standardized, Should be able to make and receive calls through the base stations of the operators of.

However, in the conventional mobile communication system,
Incoming and outgoing calls to and from mobile stations are always made for each business operator. Therefore, even if there is a base station with a large communication capacity in an area where the service areas of a plurality of businesses overlap, it is inconvenient because it is not possible to make and receive calls via this base station.

[0005]

As described above, in the conventional mobile communication system, even when the mobile station is located within the radio zone of the base station having a sufficient traffic,
It was not possible to make or receive calls via this base station. That is, even when the service areas of a plurality of systems coexist, there is a problem in that communication cannot be effectively performed by utilizing the traffic capacity as a whole.

The present invention has been made in view of the above circumstances, and an object thereof is to move a mobile station belonging to a communication network or a base station belonging to the communication network even when communication is not possible due to high traffic. It is an object of the present invention to provide a mobile communication system capable of making and receiving a call relating to a station and a radio control device thereof.

[0007]

In order to achieve the above object, the present invention provides a radio control apparatus connected to a plurality of different communication networks via communication lines, and a radio control apparatus to the radio control apparatus via communication lines. In a mobile communication system having a plurality of base stations that are connected to each other and belong to one of the plurality of different communication networks, and a mobile station that is connected to these base stations via a wireless line, The traffic of each of the plurality of base stations is constantly monitored by the monitoring means. In this state, when an incoming call is made to the mobile station from any of the plurality of communication networks, the communication network that has transmitted the incoming call is identified by the identifying means, and belongs to the communication network identified by the identifying means. Based on the monitoring result by the monitoring means, it is determined whether or not the traffic of the base station to be controlled exceeds the predetermined value. If the determination means determines that the traffic of the base station to which the destination mobile station originally belongs exceeds the specified value, the incoming control means passes through the base stations belonging to another communication network. In this way, the mobile station of the receiving end is made to receive the incoming call.

With this configuration, even if the traffic of the base station of the communication network to which the mobile station that is the destination of the incoming call is high cannot be communicated, if the traffic of the base station of another operator has a margin, Incoming call control is performed via the base station. Therefore, the problem that the mobile station cannot receive an incoming call is resolved.

Further, the present invention is any one of a radio control device connected to a plurality of different communication networks via a communication line, and a plurality of different communication networks connected to the radio control device via a communication line. In a mobile communication system having a plurality of base stations belonging to, and a mobile station connected to these base stations via a wireless line, at least one of the plurality of base stations and a radio controller. One of them is provided with a notification means, and the mobile station is provided with a determination means and a transmission control means.

The notifying means monitors the traffic of each of the plurality of base stations and notifies the mobile station of the traffic information. In addition, in the mobile station, when transmitting, whether the traffic of the base station corresponding to the communication network to which the mobile station belongs, based on the traffic information notified by the notification means, exceeds a predetermined specified value. If it is determined by the determination means that the traffic of the base station from which the own station should originally transmit the transmission information exceeds the specified value, the transmission control means determines another communication network. Is selected and the transmission information is transmitted to the base station.

With this configuration, when the mobile station originates a call, even if the traffic of the base station of the communication network to which the mobile station belongs is high and the communication cannot be performed, the mobile station does not belong to the base station of the other communication network. You can make a call via.

Further, according to the present invention, the wireless control device is provided with an identification means, a determination means, and a transmission information transmission means. Then, when the transmission information arrives from the mobile station, the communication network to which the mobile station of the transmission source belongs is identified by the identification means,
The determining means determines whether or not there is a free communication line to the communication network identified by the identifying means. When the determination means determines that there is no space, the transmission information transmission means selects another communication network and transmits the transmission information to that communication network.

Therefore, even when the transmission information from the mobile station arrives via the base station to which the mobile station does not belong,
If there is a free communication line to the communication network to which the mobile station belongs, this communication line is selected and transmission information is transmitted.
That is, since the outgoing call information is sent as much as possible to the communication network to which the originating mobile station originally belongs, it is possible to avoid complicated billing processing.

[0014]

DETAILED DESCRIPTION OF THE INVENTION

(First Embodiment) FIG. 1 is a schematic configuration diagram of a system according to a first embodiment of the present invention. In FIG. 1, a public network NWa developed by a business operator A and a public network NWb developed by a business operator B are connected to each other via a communication line L1.
The public network NWc and the public network NWb developed by the business operator C are connected to each other via a communication line L2. Each public network NWa, NWb, NWc has a subscriber line SL.
The wireless control device 1 is connected via a, SLb, and SLc. This wireless control device 1 includes communication lines ELa, EL
b, ELc via base stations CSa, CSb, CSc,
It contains (CS). These base stations CSa, CS
b and CSc belong to operator A, operator B, and operator C, respectively, and have a wireless zone Z1 in the common service area.
Is formed.

FIG. 2 is a circuit block diagram showing a main configuration of the radio controller 1. That is, the wireless control device 1
Is a line interface (I / F) 11, a line interface (I / F) control unit 12, a base station interface (I / F) 13, and a base station interface (I / F).
Control unit 14, storage unit 15, and traffic monitoring unit 16
And a business operator type identification unit 17, a comparison determination unit 18, and a call control unit 19.

The line I / F 11 is a public network NWa, NW
b and NWc, respectively, via subscriber lines SLa, SLb, SLc, which are I'lines, for example, and each public network N
It performs an interface operation related to the exchange of communication signals and various control signals with Wa, NWb, and NWc. The line I / F control unit 12 performs various controls on the line I / F 11 under the control of the call control unit 19 and mediates exchange of various signals between the call control unit 19 and the line I / F 11. , And manages the vacancy of each subscriber line SLa, SLb, SLc.

The base station I / F 13 includes the base stations CSa, C
Sb and CSc are accommodated via communication lines ELa, ELb, and ELc, which are I'lines, for example, and interface operations relating to the exchange of various control signals with the mobile station are performed. Under control of the call control unit 19, the base station I / F control unit 14 mediates various controls for the base station I / F 13 and exchange of various signals between the call control unit 19 and the base station I / F 13. I do.

The storage unit 15 is composed of, for example, a RAM, and a storage area stores therein a traffic management table in which time zones and call volumes at that time are associated with respective business operator types. The storage of the above information in the traffic management table is performed based on the traffic information sent from the base stations CSa, CSb, CSc. The traffic monitoring unit 16 measures the traffic of each base station CSa, CSb, CSc stored in the storage unit 15,
When the value exceeds a predetermined value, the call controller 19 is notified to notify the mobile station of the fact.

The business operator type identification section 17 uses the line I / F 11
When incoming information from each of the public networks NWa, NWb, and NWc via the network arrives, the sender of the incoming information is identified. Further, when the call origination information via the base station I / F 13 arrives, the operator to which the mobile station which sent this call origination information belongs is identified.

When the incoming call information arrives, the comparison and determination section 18 determines whether or not the traffic of the base station of the business operator identified by the business operator type identification section 17 exceeds a prescribed value. Based on. Further, when the transmission information arrives, the line I / F control unit 12 determines whether or not there is a vacancy in the subscriber line to the public network developed by the business operator identified by the business operator type identification unit 17. Based on the information in. The call control unit 19 includes the line I / F control unit 12, the base station I / F control unit 14, a storage unit 15, and
A traffic monitoring unit 16, an operator type identification unit 17,
The comparison / determination unit 18 is comprehensively controlled to perform various controls relating to outgoing and incoming calls.

FIG. 3 is a circuit block diagram showing the configuration of the base station CSa according to this embodiment. The base station CS
The b and CSc have the same configuration as the base station CSa.

The radio frequency signal coming from the mobile station is received by the antenna 21 and then input to the receiving unit 23 via the high frequency switch (SW) 22 of the radio unit 2. In the receiving unit 23, the received radio frequency signal is mixed with the local oscillation signal generated from the frequency synthesizer 24 and frequency-converted into a reception intermediate frequency signal. The local oscillation frequency generated by the frequency synthesizer 24 is instructed by the control unit 6 according to the radio channel frequency. Further, the radio unit 2 is provided with a reception field strength detection unit (RSSI) 26. The received electric field strength detection unit 26 detects the received electric field strength of the radio frequency signal coming from each mobile station, and notifies the detected value to the control unit 6 for free channel search or the like.

The received intermediate frequency signal output from the receiving section 23 is input to the demodulating section 31 of the modem section 3. The demodulation unit 31 digitally demodulates the received intermediate frequency signal, thereby reproducing the digital communication signal. T
In the TDMA decoding unit 41 of the DMA unit 4, the digital communication signal is decomposed for each time slot of the radio channel according to the instruction of the control unit 6, and the decomposed digital communication signal is input to the interface unit 5.

The interface unit 5 is adapted to the adaptive differential PCM.
Transcoder (ADPCM-TRANSCODER)
51 and a line interface unit 52. The digital communication signal output from the TDMA decoding unit 41 is decoded by the adaptive differential PCM transcoder 51, and then transmitted to the wireless control device 1 via the line interface unit 52.

On the other hand, the communication signal and the control signal coming from the radio controller 1 via the communication line ELa are input to the adaptive differential PCM transcoder 51 via the line interface section 52 and encoded there. After T
It is input to the DMA encoding unit 42. In the TDMA encoder 42, the output signal from the adaptive differential PCM transcoder 51 is inserted into a desired time slot and multiplexed, and this multiplexed digital signal is input to the modulator 32. In the modulator 32, the carrier signal is digitally modulated by the digital signal, and the modulated carrier signal is input to the transmitter 25. Transmitter 2
5, the modulated carrier signal is mixed with the local oscillation signal generated from the frequency synthesizer 24 to be frequency-converted to the radio channel frequency instructed by the controller 6, and further amplified to a predetermined transmission power level. To be done. Then, the radio frequency signal output from the transmitter 25 is transmitted to the antenna 21 via the high frequency switch 22.
From the mobile stations PSa1 to PSc2.

The control unit 6 is provided with, for example, a microcomputer as a main control unit, and has a control function, in addition to a normal control function relating to communication with a mobile station such as radio channel connection control and call control, as well as traffic control. It has a notification means 61. This traffic notification means 61
The amount of traffic in the base station CSa, which changes moment by moment, is notified to the radio controller 1.

Next, each mobile station PSa relating to the present embodiment
The configuration of 1 to PSc2 will be described. FIG. 4 is a circuit block diagram showing the configuration. Each mobile station PSa1 to PSc2
Includes a wireless unit 7 having an antenna 71, a modem unit 8, and
It is composed of a TDMA unit 9, a call unit 10, and a main control unit 20. That is, the radio frequency signals arriving from the base stations CSa to CSc are received by the antenna 71 and then received by the receiving unit 73 via the high frequency switch (SW) 72 of the radio unit 7.
Entered in. In the receiving unit 73, the received radio frequency signal is mixed with the local oscillation signal generated from the frequency synthesizer 74, and frequency-converted into a reception intermediate frequency signal. The local oscillation frequency generated by the frequency synthesizer 74 is instructed by the main controller 20 according to the radio channel frequency. In addition, the radio unit 7 is provided with a reception field strength detection unit (RSSI) 76. In the received electric field strength detection unit 76, each base station CSa
The received electric field strength of the radio frequency signal arriving from ~ CSc is detected, and the detected value is notified to the main control unit 20 for a free channel search or the like.

The received intermediate frequency signal output from the receiving section 73 is input to the demodulating section 81 of the modem section 8. The demodulation unit 81 digitally demodulates the received intermediate frequency signal, thereby reproducing the digital speech signal. T
The TDMA decoding unit 91 of the DMA unit 9 includes a main control unit 20.
In accordance with the instruction, the digital call signal is extracted from the time slot assigned to the own station, and the extracted digital call signal is input to the call section 10.

The call unit 10 includes an adaptive differential PCM transcoder (ADPCM-TRANSCODER) 101.
And a PCM codec (PCM-CODEC) 102.
M transcoder 101 and PCM codec 102
Are sequentially decoded and reproduced as an analog call signal. Then, this analog call signal is amplified by a receiver amplifier (not shown), and then amplified by the speaker 103.

On the other hand, the transmitted voice input to the microphone 104 is the PCM codec 102 and the adaptive difference P.
The signal is sequentially encoded by the CM transcoder 101 and becomes a digital speech signal. In the TDMA encoding unit 92, the digital speech signal output from the adaptive differential PCM transcoder 101 is inserted into the time slot designated by the main control unit 20 and input to the modulation unit 82.
In the modulator 82, the carrier signal is digitally modulated by the digital call signal, and the modulated carrier signal is input to the transmitter 75. In the transmitter 75, the modulated carrier signal is mixed with the local oscillation signal generated from the frequency synthesizer 74, so that the frequency is converted into a radio channel frequency instructed by the main controller 20, and a predetermined transmission power is further supplied. It is amplified to the level. Then, the radio frequency signal output from the transmitter 75 is transmitted from the antenna 71 to the base station CS via the high frequency switch 72.
Sent to.

The main control unit 20 has, for example, a microcomputer as its main component, and has a traffic information receiving unit 201 and a transmission control unit 202 in addition to various ordinary control units related to wireless access and wireless communication as its control functions. Have The traffic information receiving means 201 receives a notification from the wireless control device 1 via the base station that the traffic of the base station of the operator to which the own station belongs has exceeded a specified value. It is stored in a storage means such as. The transmission control means 202 determines whether or not the traffic of the base station of the operator to which the own station belongs exceeds a prescribed value, based on the information stored in the RAM when transmitting. If the traffic does not exceed the specified value, the transmission information is sent to this base station. On the other hand, if the traffic of the base station of the operator to which the own station belongs exceeds the specified value, the traffic exceeds the specified value. It controls the transmission of transmission information to the base station of another business operator.

Next, the operation of the mobile communication system configured as described above will be described. The mobile stations PSa1 and PS
It is assumed that a2 belongs to the operator A, mobile stations PSb1 and PSb2 belong to the operator B, and mobile stations PSc1 and PSc2 belong to the operator C. First, the traffic management operation in the radio controller 1 will be described based on the control procedure of the call controller 19 shown in FIG. In the above configuration, each of the base stations CSa, CSb, CSc notifies the wireless control device 1 of the traffic volume of communication via the own station at predetermined time intervals. Now, the base station I / F 13 and the base station I
/ F controller 14 in each base station CSa, CSb, CS
When the traffic notification signal from c is received, the call control unit 19 fetches this notification signal in step 6a and then extracts the traffic information in step 6b. Then, in step 6c, the extracted traffic information is
It is stored in the traffic management table of the storage unit 15 in association with the time zone and the type of business operator of the notification source base station.

Next, the incoming call operation will be described according to the control procedure of the call control unit 19 of the radio controller 1 of FIG. In this description, the case where an incoming call is made from the public network NWa to the mobile station PSa1 is described as an example. When the above is performed, similar control is performed.

First, in a steady state, the call control unit 19 of the radio controller 1 waits for incoming call information via the line I / F 11 and the line I / F control unit 12 (step 7a in FIG. 7). When the arrival of the incoming call information is detected, the call control unit 19 identifies the public network operator that is the transmission source of the incoming call information in step 7b. That is, here, the transmission source operator is identified as A. Next, the call control unit 19 determines whether there is traffic information regarding the base station CSa of the carrier A in step 7c. This determination is made by searching the traffic management table in the storage unit 15. As a result of this search, if it is determined that there is no traffic information (N), the call control unit 19 proceeds to step 7h and sends the incoming call information to the base station CSa belonging to the operator A identified here. On the other hand, if it is determined that there is traffic information (Y), the call control unit 19
Determines in step 7d whether the traffic of the base station CSa exceeds the specified value. This determination is made based on the traffic management table. here,
When it is determined that the traffic does not exceed the specified value (N), the call control unit 19 reaches step 7h and the base station CS
The incoming call information is sent to a.

On the other hand, it is assumed that it is determined in step 7d that the traffic of the base station CSa exceeds the specified value (Y). Then, the call control unit 19 proceeds to step 7e and searches the base station of another system whose traffic does not exceed the specified value based on the traffic management table. Here, if there is no base station whose traffic does not exceed the specified value, the call control unit 19 performs busy processing for the incoming call in step 7g. On the other hand, if the traffic of the base station CSb, for example, does not exceed the specified value as a result of the search in step 7e, the call control unit 19 causes the mobile station PSa1 to receive the call via the base station CSb in step 7f.

Thus, even if the traffic of the base station CSa corresponding to the public network NWa of the transmission source is high and cannot be used, the incoming call to the mobile station PSa1 is made via the base station CSb of the other public network NWb having sufficient traffic. It will be possible.

Next, the transmission operation of the system in this embodiment will be described according to the control procedure of the main control unit 20 of the radio controller 1 shown in FIG. 8 and the control procedure of the call control unit 19 of the mobile station PS shown in FIG. To do. In this description, the case where the mobile station PSa1 originates a call will be described.
Other mobile stations PSa2-PSc located in the wireless zone Z1
Similar control is performed even when the call is originated from 2.

First, in a steady state, the call control unit 19 of the radio controller 1 controls the traffic monitoring unit 16 to monitor whether the traffic of each of the base stations CSa to CSc exceeds a specified value. There is. This monitoring operation is performed based on the traffic management table. Here, when the traffic monitoring unit 16 receives a notification that the traffic of a certain base station exceeds the specified value, the call control unit 1
Reference numeral 9 notifies the base station via the base station I / F control unit 14 and the base station I / F 13 that the traffic exceeds the specified value. Upon receiving this notification, the base station notifies the mobile station belonging to the operator of the own station, out of the mobile stations located in the wireless zone of the own station, that the traffic exceeds the specified value.

Thus, each of the mobile stations PSa1 to PSc2 is notified when the traffic of the base station of the operator to which it belongs exceeds the specified value.

When the mobile station PSa1 makes a call origination operation in this state, the main controller 20 determines whether or not a notification that the traffic has exceeded the specified value is received (step 8a in FIG. 8). ). Here, if it is determined that the notification has not been received (N), the main control unit 20 proceeds to step 8c and performs normal transmission information transmission control. That is, when the traffic of the base station CSa does not exceed the specified value, the mobile station PSa1 sends out the call origination information including the dial information to the base station CSa of the operator to which the mobile station PSa1 belongs.

On the other hand, if it is determined in step 8a that the traffic has exceeded the specified value (Y), the main controller 20 proceeds to step 8b to change the type of business. . That is, the main control unit 20 changes the carrier identification code included in the transmission information, and switches the radio frequency from the frequency of the base station CSa to, for example, the frequency of the base station CSb. Next, the main control unit 20 performs step 8c.
Then, the base station CSb is accessed to send the transmission information to the base station CSb.

On the other hand, the radio controller 1 carries out the following control. That is, the call control unit 19 waits for the arrival of the outgoing call information in step 9a of FIG. Then, when the transmission information arrives from the mobile station PSa1 via the base station I / F 13 and the base station I / F control unit 14, the call control unit 19 identifies the operator to which the transmission source mobile station PSa1 belongs in step 9b. I do. That is, here, no matter which of the base stations CSa to CSc the call origination information arrives from, the operator to which the source mobile station PSa1 belongs is A
Is identified.

Then, the call controller 19 determines in step 9c whether or not there is a vacancy in the subscriber line SLa that reaches the public network NWa of the business operator A. If it is determined that there is space (Y), the call control unit 19 proceeds to step 9e and sends the call origination information from the mobile station PSa1 via the subscriber line SLa. On the other hand, if it is determined in step 9c that there is no vacancy (N), the call control unit 19 proceeds to step 9d and determines whether there is a vacancy in the subscriber line to another carrier, that is, the subscriber line SLb or SLc. Determine whether or not. And
If it is determined that there is space (Y), the call control unit 19 sends out the call origination information from the mobile station PSa1 via the subscriber line SLb in step 9f.

On the other hand, if it is determined in steps 9c and 9d that there is no vacancy in any of the subscriber lines SLb and SLc, the call control unit 19 performs busy processing for this call in step 9g.

Thus, the mobile station PS on which the originating operation is performed
Even when the traffic of the base station CSa of the business operator A to which a1 belongs cannot be used because of high traffic, the mobile station PSa1 can make a call via the base station CSb having a sufficient traffic. Further, even when the outgoing call information is sent out via the base station CSb, if there is a vacancy in the subscriber line SLa corresponding to the mobile station PSa1 of the calling source, this subscriber line SLa is preferentially used and the public network is used. It becomes possible to send outgoing information to the NWa.

As described above, in the first embodiment, the radio network controller 1 first identifies the public network operator that is the sender of the incoming call information when an incoming call is received, and the identified operator It is determined whether or not the traffic of the base station exceeds the specified value. Then, when the traffic of the base station of the operator does not exceed the specified value, incoming control is performed via this base station. On the other hand, when the traffic of the base station of the business operator exceeds the specified value, the base stations whose traffic does not exceed the specified value are searched among the base stations of other businesses. If there is a base station whose traffic does not exceed the specified value, the incoming call process is performed via this base station.

Therefore, even if the traffic of the base station of the operator to which the mobile station as the destination of the incoming call exceeds the specified value, if the traffic of the base station of the other operator has a margin, this base station Incoming call control is performed via. Therefore, the problem that the mobile station cannot receive an incoming call is resolved.

Further, the determination as to whether the traffic of each of the base stations CSa to CSc exceeds the specified value is made based on the traffic management table stored in advance. For this reason, the base station C
Since it is not necessary to acquire traffic information from Sa to CSc, it is possible to reduce the load on the wireless control device 1.

Further, in the first embodiment, the base station CSa
When the traffic of any of CSc exceeds the specified value, the fact is notified to the mobile station belonging to the operator of the base station. Then, the mobile station that has received this notification accesses the base station of another business operator to which the mobile station does not belong and makes a call to this base station. The wireless control device 1 that receives the transmission information identifies the operator to which the mobile station of the transmission source belongs,
If there is a vacancy in the subscriber line to the public network of this business operator, send out the subscriber line through that subscriber line, and if there is no vacancy, send the outgoing information from the originating mobile station via the other subscriber line with a vacancy. ing.

Therefore, even if the traffic of the base station of the operator to which the mobile station to which the transmission is going to belong exceeds the specified value, if the traffic of the base stations of other operators has a margin, Transmission control is performed via this base station. Therefore, the problem that the mobile station cannot make a call when the traffic of the base station of the operator to which it belongs exceeds the specified value is solved. Further, since the calling information is sent as much as possible to the public network to which the originating mobile station belongs, it is possible to avoid complicated billing processing.

(Second Embodiment) FIG. 10 shows a second embodiment of the present invention.
2 is a schematic configuration diagram of a mobile communication system according to the embodiment of FIG. In FIG. 10, the public network NW deployed by the business operator D
The wireless control device 1 and the exchange 100 are connected to d. Here, the public network NWd and the wireless control device 1 are connected via a subscriber line SL1 formed of, for example, an I'line, and the public network NWd and the exchange 100 are formed of a subscriber line SL100 formed of, for example, an analog line. Connected through. In addition, the wireless controller 1 and the exchange 100
Are connected to each other via a communication line LL.

The radio controller 1 is a public base station CSp1 to Csp.
The Spn is accommodated via the communication lines Lp1 to Lpn, respectively, and the exchange 100 accommodates the private base stations CSq1 to CSqm via the extension lines Lq1 to Lqm, respectively. Here, each base station CSp1 to CSpn, CSq
1 to CSqm form the same calling area Z2. In addition, in the calling area Z2, the mobile station PSp1
~ PSpj and PSq1 to PSqk are present respectively.

Incidentally, thereafter, the mobile stations PSp1 to PSpj are connected to the public network NWd, and the mobile stations PSq1 to PSqk are connected to the exchange 10.
0 belongs to a private network, and public base stations CSp1 to CSpn and private base stations CSq1 to CSqm
It has a function to send and receive with both. Further, the exchange 100 receives the incoming call information via the subscriber line SL100, and when the incoming traffic cannot be received because the traffic of the base stations CSq1 to CSqm exceeds the specified value, this incoming call is received via the communication line LL. It has a function of transferring information to the wireless control device 1.

The wireless control device 1 has a configuration substantially similar to the configuration shown in FIG. 2, but in addition to this configuration, communication signals and various controls with the exchange 100 via the communication line LL. It has a function of exchanging signals, and further, when the traffic of the base station groups CSp1 to CSpn is high and an incoming call cannot be made via these, a function of making the incoming call via the exchange 100 and an incoming signal from the exchange 100 It has a function of making this incoming call via the base station groups CSp1 to CSpn when transferred. Also, when the outgoing signals from the mobile stations PSq1 to PSqk of the private network arrive via the public base stations CSp1 to CSpn, the exchange 1
After confirming the vacant state of the subscriber line SL100 of 00,
It has a function of making a call via the subscriber line SL100.

For this control, in addition to the traffic information of the public base stations CSp1 to CSpn, the storage section 15 also stores the traffic of the self-employed base stations CSq1 to CSqm. The traffic monitoring unit 16 includes the base stations CSp1 to CSpn, C stored in the storage unit 15.
The traffic of Sq1 to CSqm is measured, and when this traffic exceeds a predetermined value, the call controller 19 is notified to notify the mobile station of that fact.

In the above system, the radio controller 1
Operates as follows. That is, the wireless control device 1 monitors the traffic of each public base station CSp1 to CSpn, and at the same time, each private base station CSq via the communication line LL.
The traffic of 1 to CSqm is also monitored. Then, for example, from the public network NWd to the mobile station P belonging to this public network NWd.
When receiving the incoming call information for Sp1, the public base station C
If any traffic of Sp1 to CSpn exceeds the specified value, the radio controller 1 transfers the incoming call information to the exchange 100 via the communication line LL, and
Self-employed base stations CSq1 to CSq with vacant traffic
The mobile station PSp1 is caused to make an incoming call from any one of m.

Further, the radio controller 1 uses each base station CSp1.
~ CSpn, if there is a base station whose traffic exceeds the specified value based on the monitoring results for CSq1 to CSqm, the fact is notified to the mobile station located in the wireless zone formed by the base station. Notice.

When the mobile station PSp1 originates a call, for example, if the mobile station PSp1 receives a notification that the traffic of the base station in the area has exceeded a specified value, the mobile station PSp1 is self-employed. Base stations CSq1 to CSq
The transmission information is transmitted to a base station forming a wireless zone in which the own station is located in m. That is, the mobile station belonging to the public network switches the radio frequency to the frequency for the private base station, and the mobile station belonging to the private network switches the radio frequency to the frequency for the public base station for transmission. Further, the wireless control device 1 manages the air-blocked state of the subscriber lines SL1 and SL100, identifies the network (public network or private network) to which the mobile station of the transmission source belongs, and notifies the base station which has received the transmission information. The call is sent via the subscriber line corresponding to the network to which the originating mobile station belongs. Then, only when there is no vacancy in the corresponding subscriber line, the call is transmitted through another subscriber line.

Therefore, if the public base stations CSp1.
Even if the traffic of CSpn exceeds the specified value, if any of the traffic of the self-employed base stations CSq1 to CSqm has a margin, each mobile station PS in the calling area Z2
It is possible to make a call from p1 to PSpj and PSq1 to PSqk and to receive an incoming call for each mobile station. On the contrary, even when the traffic of the self-employed base stations CSq1 to CSqm exceeds the specified value, the public base stations CSp1 to CSpn
If any of the traffic has a margin, the mobile stations PSp1 to PSpj, PSq1 to PSq1 in the calling area Z2
It is possible to make a call from PSqk and receive a call to each mobile station. Furthermore, if there is a margin in the traffic of at least one base station, it is possible to make a call from each mobile station PSp1 to PSpj, PSq1 to PSqk within the calling area Z2 and to make an incoming call to each mobile station.

The present invention is not limited to the above embodiments. For example, in each of the above embodiments, the storage unit 1
In FIG. 5, the traffic management table in which the time zone and the traffic information (call volume) at that time are associated with each operator type is stored, but each base station configures the time zone and the traffic information at that time. It may be associated with the calling area or may be associated with the identification information of each base station. The traffic management tables configured in this manner are shown in FIGS. 11 and 12, respectively.

Further, in the first embodiment, only when the traffic of a certain base station exceeds the specified value, the fact is notified to the mobile station corresponding to the operator of the base station. Regardless of the operator type of the station, the identification information of the base station whose traffic exceeds the specified value is used as the wireless zone Z.
All mobile stations within 1 may be notified, or the traffic information of each base station may be periodically notified to each mobile station. By doing so, when switching the carrier type of the transmission destination base station, it is possible to eliminate the risk of switching to the base station whose traffic has already exceeded the specified value.

In addition, various modifications can be made without departing from the scope of the present invention.

[0063]

As described above in detail, according to the present invention, traffic information regarding a plurality of base stations is monitored, and when an incoming call to a mobile station occurs from any of a plurality of communication networks, the incoming call is transmitted. The identified communication network is identified, and it is determined whether or not the traffic of the base station belonging to the identified communication network exceeds a predetermined specified value based on the above traffic information. When it is determined that the number exceeds the limit, the incoming call is made to the incoming mobile station via the base station belonging to another communication network.

Further, according to the present invention, the traffic information regarding each base station is monitored to notify the mobile station of the traffic information, and based on the traffic information notified when the mobile station originates a call, It is determined whether the traffic of the base station corresponding to the communication network to which it belongs exceeds a predetermined specified value. If it is determined that the traffic exceeds the specified value, it belongs to another communication network. The base station is selected and the transmission information is transmitted to the base station.

As described above, a mobile communication system and a mobile communication system capable of making and receiving a call related to a mobile station belonging to the communication network even when the traffic of the communication network or a base station belonging to the communication network is high and communication cannot be performed. A wireless controller can be provided.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a system according to a first embodiment of the present invention.

FIG. 2 is a circuit block diagram showing a main configuration of a wireless control device 1 according to the first embodiment.

FIG. 3 is a diagram showing base stations CSa to CSc according to the first embodiment.
3 is a circuit block diagram showing the configuration of FIG.

FIG. 4 is a diagram showing the mobile stations PSa1 to PSa according to the first embodiment.
The circuit block diagram which shows the structure of Sc2.

FIG. 5 is a diagram showing an example of a traffic management table.

FIG. 6 is a flowchart showing a traffic management operation of the call control unit 19.

FIG. 7 is a flowchart showing an incoming call processing procedure of the call control unit 19.

FIG. 8 is a flowchart showing a transmission processing procedure of the main control unit 20.

FIG. 9 is a flowchart showing a call processing procedure of the call control unit 19.

FIG. 10 is a schematic configuration diagram of a system according to a second embodiment of the present invention.

FIG. 11 is a diagram showing another example of a traffic management table.

FIG. 12 is a diagram showing another example of a traffic management table.

[Explanation of symbols]

NWa ... Public network NWb developed by business operator A ... Public network NWc developed by business operator B ... Public network L1, L2 developed by business operator C ... Communication lines SLa, SLb, SLc ... Subscriber lines ELa, ELb, ELc ... communication lines CSa, CSb, CSc, (CS) ... base stations PSa1, PSa2, PSb1, PSb2, PSc1,
PSc2 ... Mobile station Z1 ... Radio zone 1 ... Radio control device 11 ... Line interface (I / F) 12 ... Line I / F control unit 13 ... Base station interface (I / F) 14 ... Base station I / F control unit 15 Storage unit 16 Traffic monitoring unit 17 Business operator type identification unit 18 Comparison determination unit 19 Call control unit 2 Base station radio unit 3 Base station modem unit 4 Base station TDMA unit 5 Base station Interface unit 6 ... Base station control unit 7 ... Mobile station radio unit 8 ... Mobile station modem unit 9 ... Mobile station TDMA unit 10 ... Mobile station communication unit 20 ... Mobile station main control unit 21, 71 ... Antenna 22, 72 ... High frequency switch (SW) 23, 73 ... Receiving section 24, 74 ... Frequency synthesizer 25, 75 ... Transmitting section 26, 76 ... Received field strength detecting section (RSSI) 31, 81 ... Demodulating section 32, 82 ... Modulator 41, 91 ... TDMA decoding unit 42, 92 ... TDMA encoding unit 51 ... Adaptive difference PCM transcoder (ADPCM-
TRANSCODER 52 ... Line interface 61 ... Traffic notification means 101 ... Adaptive differential PCM transcoder (ADPCM)
-TRANSCODER 102 ... PCM codec (PCM-CODEC) 103 ... Speaker 104 ... Microphone 201 ... Traffic information receiving means 202 ... Transmission control means NWd ... Public network SL1, SL100 ... Subscriber lines CSp1 to CSpn ... Public base stations CSq1 to CSqm ... Self-employed base stations Lp1 to Lpn ... Communication lines Lq1 to Lqm ... Extensions LL ... Communication line 100 ... Exchanges PSp1 to PSpj, PSq1 to PSqk ... Mobile station Z2 ... Calling area

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI H04Q 7/04 D (56) Reference JP-A-8-307941 (JP, A) JP-A-8-228372 (JP, A) JP-A-3-102925 (JP, A) JP-A-5-327598 (JP, A) JP-A-11-18130 (JP, A) JP-A-5-292012 (JP, A) JP-A-63-272130 (JP, A) JP-A-6-178345 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38

Claims (6)

(57) [Claims] 1. A wireless control device connected to a plurality of different communication networks via a communication line, and belonging to any one of the plurality of different communication networks connected to the wireless control device via a communication line. A mobile communication system having a plurality of base stations and a mobile station connected to these base stations via a wireless line, and monitoring means for monitoring traffic information regarding the plurality of base stations, When an incoming call to the mobile station is generated from any of a plurality of communication networks, an identification unit that identifies the communication network that transmitted the incoming call, and a base station that belongs to the communication network identified by the identification unit. Judgment means for judging whether or not the traffic exceeds a predetermined specified value based on the monitoring result by the monitoring means, and the traffic exceeds the specified value by this judgment means. Mobile communication system comprising the reception control means for causing an incoming call to the mobile station of the destination via the base station belonging to another communication network when it is determined. 2. The monitoring means monitors at least one of traffic information regarding a plurality of base stations for each base station, each base station group existing in a calling area, or each base station group belonging to a communication network. The mobile communication system according to claim 1, wherein the mobile communication system is carried out by one. 3. The monitoring means measures the traffic of its own station by each base station and notifies the radio control device of the measurement result, and the radio control device displays the traffic measurement result notified from each base station. The mobile communication system according to claim 1, which holds the mobile communication system. 4. A radio control device connected to a plurality of different communication networks via a communication line, and belonging to one of the plurality of different communication networks connected to the radio control device via a communication line. The radio control device used in a mobile communication system having a plurality of base stations and a mobile station connected to these base stations via a radio line, wherein traffic information about the plurality of base stations Monitoring means for monitoring the communication network, an identification means for identifying the communication network that transmitted the incoming call when an incoming call to the mobile station is generated from any one of the plurality of communication networks, and an identification means for identifying the communication network. Determination means for determining whether or not the traffic of the base station belonging to the communication network exceeds a predetermined specified value based on the monitoring result by the monitoring means; If the communication speed is determined to exceed the specified value, it is equipped with an incoming call control means for making an incoming call to the incoming call destination mobile station via a base station belonging to another communication network. Wireless control device. 5. A radio control device connected to a plurality of different communication networks via a communication line, and belonging to any one of the plurality of different communication networks connected to the radio control device via a communication line. A plurality of base stations, a mobile communication system having a mobile station connected to these base stations via a radio line, at least one of the plurality of base stations and radio control device, The mobile station comprises notifying means for monitoring the traffic information about the plurality of base stations and notifying the traffic information to the mobile station, and the mobile station, based on the traffic information notified by the notifying means, when transmitting. And a determination means for determining whether or not the traffic of the base station corresponding to the communication network to which the own station belongs exceeds a predetermined specified value. Is determined to exceed the specified value, the mobile station is provided with a transmission control means for selecting a base station belonging to another communication network and transmitting transmission information to the base station. Communications system. 6. The wireless control device, when transmission information arrives from a mobile station, identifies the communication network to which the mobile station of the transmission source belongs and the communication network identified by the identification means. Determination means for determining whether or not there is a free communication line, and when this determination means determines that there is no free space,
6. A transmission information transmitting means for selecting another communication network and transmitting transmission information to the communication network.
The mobile communication system described.