JP3351655B2 - Mobile communication system and shared base station device used in this system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system in which a number of base stations are dispersedly arranged in a service area, such as a simple cellular phone system and a digital car / cell phone system.

[0002]

2. Description of the Related Art In recent years, as a digital mobile communication system, a simplified portable telephone system (hereinafter abbreviated as PHS; Personal Handy Phone System) using microcells has been developed and will be put to practical use soon.

[0003] The PHS is such that the size of the area covered by one base station is as small as 100 to 200 meters,
This is a system in which subscriber accommodation capacity is increased by increasing the frequency repetition efficiency.

[0004] The PHS includes a public system constructed in a wider area including a public area by connecting to a public digital network, and a private system constructed in a home or a business center with a private branch exchange as a core. There is. Of these, for public systems, the participation of three operators per region is allowed to promote competition for public services. Therefore, up to four systems will be constructed depending on the region.

FIG. 23 shows the basic configuration of the above-mentioned public system. That is, a plurality of base stations CS1 to CSm are distributed and arranged in the service area, and the radius of each of these base stations CS1 to CSm is 100 to 2 respectively.
A wireless zone called a 00 meter cell is formed. The base stations CS1 to CSm are respectively connected to a public digital network INW composed of, for example, an integrated service digital network (hereinafter abbreviated as ISDN).

[0006] As a connection interface to the public digital network INW, an I 'interface is used. The I 'interface is obtained by adding the location registration procedure of the PHS mobile station to the I interface, which is an ISDN user / network interface, and uses two ISDN basic interface lines (2B + D). That is, the I 'interface has two D channels for control and four B channels for information communication.

[0007] Each of the mobile stations PS1 to PSn is connected to the base station C.
In a wireless zone formed by S1 to CSm, the base station is selectively connected to a base station CS1 to CSm via a wireless channel, and is wired from the base station CS1 to CSm via the ISDN or the ISDN and a subscriber telephone network SNW. Telephone TE
L1 to TELk and home PHS are connected.

The public PHS includes a management control device CC having a database for operating the system and a customer information management database. The management control device CC includes the mobile stations PS1 to PSn and the base station CS.
1 to CSm is ISDN and packet network P
Collected via the NW, service management and control such as authentication, accounting, network management, etc. are performed based on this information.

[0009]

However, the currently proposed PHS has the following problems to be solved.
That is, since the PHS employs the microcell method, the frequency use efficiency is high, but a huge number of base stations need to be installed. For example, if the service area is an outdoor area in Tokyo's 23 wards, 20,000 to 40,000 base stations must be installed. In this case, for example, in an area with a high traffic density, such as in a downtown area or a station yard, even if three public system operators install each of these base stations, the use corresponding to the base stations is secured. It seems to pay economically. However, in areas with low traffic densities, such as local municipalities and suburban residential areas, there is not much use.

[0010]

The present invention has been made in view of the above circumstances, and aims at improving economic efficiency by eliminating the need to duplicately install base stations of a plurality of mobile communication networks. To provide a mobile communication system and a shared base station device capable of efficiently using a line between a base station and a public network by a plurality of mobile communication networks to improve line use efficiency and reduce a call loss rate. It is in.

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is directed to a fixed communication network, which is connected to a fixed communication network via a plurality of lines, to an overlapping area of each service area formed by a plurality of mobile communication networks. Install at least one shared base station,
The shared base station is provided with resource control means, and the resource control means dynamically controls the assignment of the plurality of lines to the plurality of mobile communication networks.

Further, the resource control means allocates the plurality of lines to a plurality of mobile communication networks by using the following various control methods.
That is, the first control method allocates a specific control line among the plurality of control lines as a common control line to the plurality of mobile communication networks, and assigns another control line to the plurality of mobile communication networks. On the other hand, it is separately allocated as a dedicated control line.

According to a second control method, a specific information line among the plurality of information lines is allocated to the plurality of mobile communication networks as a shared information line, and another information line is assigned to the plurality of mobile communication networks. On the other hand, it is separately allocated as a dedicated information line.

According to a third control method, the plurality of control lines are separately allocated to the plurality of mobile communication networks as dedicated control lines, and the plurality of information lines are shared by the plurality of mobile communication networks. Is allocated as an information line.

According to a fourth control method, the plurality of information lines are separated and assigned to the plurality of mobile communication networks as dedicated information lines, and the plurality of control lines are shared by the plurality of mobile communication networks. Is allocated as a control line.

In a fifth control method, the plurality of control lines are allocated to the plurality of mobile communication networks as a common control line, and the plurality of information lines are shared to the plurality of mobile communication networks. Is assigned as

Further, the resource control means is characterized in that the assignment of the plurality of lines to each mobile communication network is adaptively variably controlled using the following various control methods.

That is, the first adaptive control method is as follows:
It has terminal number monitoring means for monitoring the number of mobile stations for each mobile communication network existing in the wireless area formed by its own shared base station, and the number of mobile stations for each mobile communication network obtained by this terminal number monitoring means. The assignment of the plurality of lines to each of the mobile communication networks is adaptively variably controlled according to the number of stations.

The second adaptive control system has traffic monitoring means for monitoring the traffic of each mobile communication network by mobile stations existing in a wireless area formed by its own shared base station, and this traffic monitoring means The allocation of the plurality of lines to each of the mobile communication networks is adaptively variably controlled in accordance with the traffic for each mobile communication network obtained by the method. The third adaptive control method variably controls the assignment of the plurality of lines to each of the mobile communication networks according to a preset time schedule.

[0028]

[0029]

[0030]

[0031]

[0032]

According to the present invention, a shared base station shared by a plurality of mobile communication networks is provided, and the assignment of a plurality of lines to a plurality of mobile communication networks is dynamically variably controlled by the shared base station. For this reason, it is not necessary to provide a base station for each mobile communication network, thereby making it possible to reduce the facility load on each mobile communication network. In addition, compared to a case where a plurality of lines are fixedly and equally allocated to a plurality of mobile communication networks, the lines can be used efficiently according to the number of terminals and traffic of each mobile communication network, thereby making it possible to use the lines more efficiently. It is possible to improve the utilization rate and reduce the call blocking rate.

[0033]

【Example】

(First Embodiment) FIG. 1 is a schematic configuration diagram of a PHS according to a first embodiment of the present invention. 23, the same parts as those in FIG. 23 are denoted by the same reference numerals.

Among a plurality of base stations distributed in the service area, for example, a plurality of base station groups CSa1 and CSa2 arranged in an area having a low traffic density include:
Integrated control devices ISa1, ISa1 and IS
a2, and these integrated control devices ISa
1 and ISa2 are connected to the public digital network INW via I 'lines. At this time, one integrated control device ISa1, ISa2 and the public digital network INW
The number of I 'lines connecting the
a1, ISa2, base stations CSa1, CSa1,...
Is set to be smaller than the total number of I 'lines for connecting

The integrated control devices ISa1 and ISa2 are configured as follows. FIG. 2 is a circuit block diagram showing the configuration. Since the integrated controllers ISa1 and ISa2 have the same configuration, FIG. 2 shows only the integrated controller ISa1 as a representative.

The integrated control device ISa1 is connected to each base station CSa
, CSa1,... Are connected via an I 'line, and a second I' line interface 12 is connected to the public digital network INW via the I 'line. , A switch unit 13a,
And a main control unit 14a.

The first I 'line interface 11 is connected to each of the base stations CSa1, CSa1,.
Under the control of the main control unit 14a, each I 'line is terminated and a control signal and communication data are transmitted and received between each I' line and the switch unit 13a.

The second I 'line interface 12 performs an interface operation for the I' line connecting to the public digital network INW, and the main control unit 14a
Under the control described above, the I 'line is terminated, and a control signal and communication data are exchanged between the I' line and the switch unit 13a.

The switch unit 13a controls the first and second I 'line interfaces 1 under the control of the main control unit 14a.
B channel switching between 1 and 12 is performed. The D channel is relayed.

The main control section 14a has a function of managing the position information of the mobile stations existing in its own radio area formed by the base stations CSa1, CSa1,. When an incoming call arrives at the destination, the location of the destination mobile station is specified using the above-mentioned database, and a function of causing the corresponding base station to perform the incoming call processing, and a call request from the mobile station has arrived. In this case, it is determined whether the call destination is another mobile station existing in the own wireless area, and if the mobile station is another mobile station existing in the own wireless area, the mobile station and the calling mobile station are called. If the call destination is a terminal connected to the public digital network INW via the switch unit 13a and the call destination is a terminal connected to the public digital network INW, the public digital network is connected via the second I 'line interface 12. Net INW And a function of sending the outgoing request.

On the other hand, each of the base stations CSa1, CSa2,... Is configured as follows. FIG. 3 is a circuit block diagram showing the configuration. Since the base stations CSa1, CSa2,... Have the same configuration, FIG. 3 shows only the base station CSa1 as a representative.

The base station CSa1 includes an antenna 21, a radio (RF) unit 22, a modem codec unit 23, a switch unit 24, and an I 'line interface 25.
Further, a wireless controller 26a and a main controller 27 are provided.

The I 'line interface 25 provides an interface for the I' line connecting to the integrated control device ISa1. Under the control of the main control unit 27, the I 'line is terminated and the I' line is terminated. A control signal and communication data are transmitted and received between the switch unit and the switch unit.

Under the control of the main control unit 27, the switch unit 24 transfers communication data from the B channel of the I 'line to the wireless channel, and switches from the wireless line (air interface) to the B channel of the I' line. The transfer of communication data is performed.

The modem / codec unit 23 has a function of performing digital modulation / demodulation of communication data transmitted / received to / from a mobile station via a communication channel of a radio line, and a function of performing code decoding processing on the communication data. ing. In the codec, the B channel of the I 'line (64 kbp
s) and a speed conversion process between the wireless channel slot (32 kbps). As the digital modulation / demodulation method, for example, a π / 4 shift QPSK method is used, and as a code decoding processing method, an ADPCM method is used.

The radio control unit 26a, when performing radio communication with a mobile station, uses the carrier 77 held by the PHS.
An empty carrier is searched for in the wave (1.9 G band), and this carrier is designated to the radio circuit unit 22 as a communication channel. When transmitting a control signal, a carrier for a control channel fixedly allocated in advance in the 77 waves is designated to the radio circuit unit 22. Wireless circuit section 22
Performs wireless communication with the mobile station through the antenna 21 using an empty carrier designated by the wireless control unit 26a.

The main control unit 27 performs connection control processing relating to incoming and outgoing calls of the mobile station by using the control channel of the radio line and the D channel of the I 'line, and performs the management control provided by the PHS operator. Control data necessary for the authentication procedure and accounting processing is exchanged with the database of the device CC.

Next, the operation of the system configured as described above will be described. Now, suppose that a mobile station existing in a wireless area formed by each base station CSa1, CSa1, ... connected to the integrated control device ISa1 has transmitted a call request. Then, the call request is sent to the base station CSa1,
After being received by one of CSa1,..., It is transferred from this base station to the integrated control device ISa1 via the I 'line. Upon receiving the call request, the integrated control device ISa1
Recognizes the call destination from the call request, and stores in the database in the main control unit 14a whether or not the call destination is another mobile station existing within its own wireless area. The mobile station is determined based on the location management information of the mobile station.

If the call destination is another mobile station existing within the own radio area, the call signal is sent to the base station corresponding to the area where the call destination mobile station exists. And a switch 13a connects between the B channel of the I 'line assigned to the call destination mobile station and the B channel of the I' line assigned to the call source mobile station. . In other words, when the call destination is a mobile station existing in its own wireless area, the integrated control device ISa1 does not transfer a call request to the public digital network INW, but makes a call in its own device. The original mobile station and the destination mobile station are looped back and connected.

When performing this loopback connection, the authentication procedure for the calling mobile station, that is, the database in the management and control unit CC is accessed via the public digital network INW and the packet network PNW. The execution of the procedure for checking the qualification is omitted.

On the other hand, if the call destination is another mobile station that does not exist within its own wireless area, or if it is a wired terminal connected to the public digital network INW or the subscriber telephone network SNW, A call request is sent from the I 'line interface 12 to the public digital network INW.

On the other hand, it is assumed that an incoming call arrives from the public digital network INW. Then, the integrated control device ISa1
The location of the called mobile station is identified by searching the database in the main control unit 14a, and an incoming signal is transmitted from the base station corresponding to the identified location to the called mobile station. I do. Then, the radio communication channel allocated by the base station to the destination mobile station and the B '
A connection is established with the channel, and thereafter, communication can be performed between the calling terminal and the called mobile station.

As described above, in the present embodiment, a plurality of base stations CSa1, CSa1
a1, ... are accommodated in the integrated control device ISa1,
Each of the base stations CSa is controlled by the integrated control device ISa1.
, 1, CSa1,... Are connected to the public digital network INW via the I 'line of the public digital network INW which is smaller than the total number of channels of the I' line.

Therefore, a plurality of base stations CSa1, CSa1
a1,... can be connected to the public digital network INW by using the I 'line of a small number of channels. Therefore, it is possible to efficiently use the I 'line of the public digital network INW even in an area where the traffic density is low, thereby enabling effective use of the public I' line.

In this embodiment, the integrated control device ISa
1 and ISa2, a database is provided in the main control unit 14a for storing location management information of mobile stations in its own wireless area, and when a call request comes from a mobile station in its own wireless area, It is determined based on the database whether or not the call destination is another mobile station existing within its own wireless area. If it is determined that the call destination is another mobile station existing in its own wireless area, the call is not made to the public digital network INW, and
The connection between the calling mobile station and the called mobile station is established via the switch unit 13a in the own apparatus.

Therefore, the traffic to the public digital network INW can be reduced, and the traffic of the public digital network INW can be reduced. The above embodiment can be modified as follows. That is, in the above-described embodiment, the existing base stations CSa1, CSa1,... Are connected to the integrated control device ISa1 as they are, but the function of the integrated control device is eliminated by removing the main control unit provided in each base station. IS
The main control unit of a1 may be provided.

FIG. 4 shows an integrated control device ISb1 in that case.
FIG. 2 is a circuit block diagram showing the configuration of FIG. Integrated control device I
Sb1 includes an I 'line interface 12, an RF interface 15, and an I' line interface 1 connected to the public digital network INW via an I 'line.
A switch unit 13b for performing a relay transfer process of data between the communication interface 2 and the RF interface 15; and a main control unit 14b.

A plurality of simple base stations CSb1, CSb1,... Are connected to the RF interface 15. R
The F interface 15 is controlled by the main control unit 14b.
The communication data is exchanged with the simple base stations CSb1, CSb1,.

The main control unit 14b performs various controls related to incoming and outgoing calls of the mobile station using the database, and also performs wireless connection control between each of the simple base stations CSb1, CSb1,... And the mobile station.

FIG. 5 is a circuit block diagram showing the configuration of the simple base station CSb1. The simple base station CSb1 is different from the existing base station CSa1 described with reference to FIG.
7 and the interface for connection with the integrated control device ISb1 is changed from the I 'line interface 25 to, for example, the I line interface 28.

With such a configuration, each simple base station CSb1, CSb1,
The structure of CSb1,... Can be simplified and miniaturized, and the cost can be significantly reduced. This system configuration is suitable when a new system is constructed in a low traffic area. Incidentally, the configuration described in the first embodiment is advantageous in that an integrated base station can be utilized when an integrated control device is additionally provided in an area where base stations are already installed.

(Second Embodiment) In this embodiment, an integrated control device to which a plurality of base stations are connected is connected to a public digital network via an I line in addition to an I 'line. It is also connected to the subscriber telephone network SNW via a line. And
When a call request arrives from the mobile station, the presence or absence of the I 'line is determined, and if not, the I line or the subscriber line is selected to make a call to the public network. It was done.

FIG. 6 is a schematic configuration diagram of a PHS according to the present embodiment, and the same parts as those in FIG. 1 are denoted by the same reference numerals. The integrated control device ISc2 to which a plurality of base stations CSc2, CSc2,... Are connected is connected to the public digital network INW via the I 'line in addition to the I' line. The integrated control device ISc1 to which the base stations CSc1, CSc1,... Are connected is connected to the public digital network INW via the I 'line in addition to the I' line, and is also connected to the subscriber telephone network SNW via the subscriber line. It is connected.

FIG. 7 is a circuit block diagram showing the configuration of the integrated control device CSc1, and the same parts as those in FIG. 2 are denoted by the same reference numerals. The integrated controller CSc1 has an I-line interface 1 in addition to the I'-line interface 12.
6 and a subscriber telephone interface 17 are provided.

The I line interface 16 is connected to the main controller 1
Under the control of 4c, the I line of the public digital network INW is terminated, and communication data is transferred between this I line and the switch unit 13c. Subscriber telephone interface 17
Terminates the subscriber line of the subscriber telephone network SNW under the control of the main control unit 14c, and connects this subscriber line to the switch unit 13c.
Transfer of communication data to and from the device. That is,
Since the subscriber line is an analog line, the subscriber telephone interface 17 performs analog / digital conversion and digital / analog conversion of communication data.

Further, the main control unit 14c operates the I 'line, I
It has a new line and subscriber line selective transmission control function. In this function, when a call request from the mobile station to the public network arrives, it is first determined whether or not the I 'line is free.
If the I 'line is free, the I' line is selected and a call signal is transmitted to the public digital network INW. On the other hand, when all the I 'lines are blocked, it is determined whether or not there is an I line, and if there is a vacancy, a call signal is transmitted through this I line. A subscriber line is selected and a call signal is transmitted to the subscriber telephone network SNW.

With such a configuration, for example, even if calls from mobile stations are concentrated and the I 'line becomes full, call processing can be performed by using the I line and the subscriber line. Thus, the call loss rate can be kept low.

In the above embodiment, the existing base station C
The case where Sc1, CSc1,... Are connected to the integrated control device ISc1 has been described as an example. In addition, as shown in FIG. 8, for example, each base station is composed of simple base stations CSd1, CSd1,... Having only a radio circuit system, and radio between the simple base stations CSd1, CSd1,. Main control unit 14 of integrated control device ISd1
d may be provided.

With this configuration, the configuration of each base station can be simplified and miniaturized as in the case described with reference to FIGS. 4 and 5, and the cost can be significantly reduced. it can.

(Third Embodiment) In this embodiment, an integrated control device to which a plurality of base stations are connected is connected to a public digital network via an I 'line and to an extension of a private branch exchange, and When a call request arrives from the station, the presence or absence of the I 'line is determined. If the I' line is not available, the extension is selected and the call is made to the subscriber telephone network via the private branch exchange. It is intended to be called.

FIG. 9 is a schematic configuration diagram of a PHS according to the present embodiment, and the same parts as those in FIG. 1 are denoted by the same reference numerals. In the figure, an integrated control device ISe1 is connected to an extension of a private branch exchange (PBX) PX. This private branch exchange PX accommodates a plurality of extension telephones TEL11 to TEL1k and also has a private telephone network S via a plurality of subscriber lines.
Connected to NW.

FIG. 10 is a circuit block diagram showing the configuration of the integrated control device ISe1, and the same parts as those in FIG. 2 are denoted by the same reference numerals. The integrated controller ISe1 has a PBX interface 18 in addition to the I 'line interface 12. PBX interface 18
Terminates the extension of the private branch exchange PX under the control of the main control unit 14e, performs interface processing for the extension such as line capture and incoming call detection, and transfer processing of communication data between the extension and the switch unit 13e. . At this time, if the extension of the private branch exchange PX is an analog line, analog / digital conversion processing and digital / analog conversion processing of call data are performed.

The main control section 14e newly has a function of selectively transmitting the I 'line and the extension of the private branch exchange PX. In this function, when a call request from the mobile station to the public network arrives, it is first determined whether or not the I 'line is free.
If the I 'line is free, the I' line is selected and a call signal is transmitted to the public digital network INW. On the other hand, if all the I 'lines are blocked, the extension of the private branch exchange PX is selected and a call signal is sent to the private branch exchange PX.

With such a configuration, for example, even when calls from mobile stations are concentrated and the I 'line becomes full, a call is made to the subscriber telephone line SNW via the private branch exchange PX. Therefore, the call blocking rate can be kept low.

When the destination of the call is the extension telephone of the private branch exchange PX, the private branch exchange P is connected without passing through the public digital network INW and the subscriber telephone network SNW.
It is possible to make an extension connection between the calling mobile station and the called extension telephone via only X, thereby reducing the traffic of the public digital network INW and the subscriber telephone network SNW. .

Further, by providing a private branch exchange with a database equivalent to the database provided in the main control unit 14e of the integrated control apparatus, the private branch exchange between the calling source mobile station and the calling destination mobile station is performed. The connection can be turned back at the exchange. With this configuration, it is possible to make an extension connection between mobile stations by using the switch function inherent in the private branch exchange as it is, and it is necessary to make a return connection between mobile stations in the integrated control device. As a result, the switch section of the integrated control device and its control function can be simplified.

Also, by extending the extensions of the private branch exchange PX to the PBX interface 18 for a plurality of lines,
At normal times, it is also possible to make a call by using each extension of the private branch exchange PX with priority and to make an outgoing call by selecting the I 'line when these extensions have no free space. In this case, each extension of the private branch exchange PX is connected to the ISDN
It is effective to use a digital line equivalent to or equivalent to the I line because it is possible to maintain the secret function of the PHS.

In this embodiment, for example, FIG.
, Each base station connected to the integrated control device ISe1 is composed of simple base stations CSf1, CSf1,.
It is possible to configure the main control unit 14f of the integrated control device ISf1 to have a wireless connection control function between these simple base stations CSf1, CSf1,... And the mobile station. With this configuration, the configuration of each base station can be simplified and miniaturized, and the cost can be significantly reduced.

In addition, the integrated control device described in each of the first to third embodiments can be variously modified as follows. First, in FIG. 12, the integrated controller ISg1 is provided with a subscriber telephone interface 17 and a PBX interface 18 in addition to the I 'line interface 12. Then, when a call request arrives from the mobile station, the main control unit 14g determines whether there is a free I 'line, and
If there is a free line, this I 'line is selected and a call signal is transmitted to the public digital network INW. If all the I' lines are blocked, the extension of the private branch exchange PX or the joining of the subscriber telephone network SNW. The calling line is selected and a call signal is transmitted.

With this configuration, even when calls from mobile stations are concentrated and the I 'line becomes full,
By selectively using the extension of the private branch exchange PX and the subscriber line of the subscriber telephone network SNW, a calling process can be performed, and the call loss rate can be reduced.

In this case, the extensions of the private branch exchange PX are drawn into the PBX interface 18 for a plurality of lines, so that a call is preferentially made using each extension of the private branch exchange PX at normal times, and these extensions are free. When there is no call, it is also possible to select an I 'line or a subscriber line to make a call. In this case, the private branch exchange P
Each extension of X may be constituted by a digital line equivalent to or equivalent to the I line of ISDN.

Next, in FIG. 13, each of the base stations CSg1, CSg1,... Shown in FIG. 12 is replaced with simple base stations CSh1, CSf1,. .. And each mobile station are provided in the main control unit 14h of the integrated control device ISh1. With this configuration, the configuration of each base station can be simplified and miniaturized, and the cost can be significantly reduced.

(Fourth Embodiment) The PHS of this embodiment is 3
Two PHS operators X, Y, Z share one base station,
A plurality of I 'lines connecting the base station and the public digital network are dynamically assigned to the PHS operators X, Y and Z.

FIG. 14 is a circuit block diagram showing a configuration of a base station which is a main part of the PHS of this embodiment. The base station according to the present embodiment includes one shared control unit CCS and a plurality (three in the figure) of radio units RS1 to RS3 connected to the shared control unit CCS.

First, each of the radio units RS1 to RS3
An antenna 31, a radio circuit (RF) 32, and a modem
It includes a codec unit 33, an interface 34 with the shared control unit CCS, and a wireless control unit 35.

When performing radio communication with a mobile station, the radio control unit 35 searches for an empty carrier from 77 carriers (1.9G band) held by the PHS and communicates with this carrier. Is specified to the radio circuit unit 32 as the channel for use. When transmitting a control signal, a carrier for a control channel fixedly assigned in advance to each of the PHS operators X, Y, and Z is designated to the radio circuit unit 32. In addition, as a wireless transmission system between the radio units RS1 to RS3 and each mobile station, a TDMA-TDD system in which one frame includes four transmission / reception slots is used. The wireless circuit unit 32 performs wireless communication with the mobile station through the antenna 31 using the carrier specified by the wireless control unit 35.

The modem / codec unit 33 has a function of performing digital modulation / demodulation of communication data transmitted / received to / from a mobile station via a communication channel on a wireless line, and a function of performing code decoding processing on communication data. are doing.
In the codec section, the B channel of the I 'line (64 k
bps) and transmission / reception slot of wireless line (32 kbps)
The speed conversion process is also performed. As the digital modulation / demodulation method, for example, a π / 4 shift QPSK method is adopted, and the code decoding processing method is ADPC.
The M method is adopted.

The interface 34 serves as an interface for a signal line connecting to a common control unit CCS described later.
It exchanges control signals and communication data with the codec unit 33.

On the other hand, the common control unit CCS includes a radio unit interface 41, an I ′ line interface 42, a switch unit 43, a main control unit 50, and a database 60.

The radio interface 41 performs an interface for a signal line connecting the radio units RS1 to R3. Under the control of the main control unit 50, the signal line is terminated and the signal line is terminated. A control signal and communication data are transmitted and received between the switch and the switch unit 43.

The I 'line interface 42 is provided with three sets of I' lines (I ') connecting to the public digital network INW.
The line has two 2B + D lines.
Under the control of the main control unit 44, terminates each I 'line, and switches the I' line and the switch unit 4 under the control of the main control unit 44.
3 is exchanged with a control signal and communication data.

The switch unit 43 switches the B channel between the radio unit interface 41 and the I 'line interface 42 under the control of the main control unit 44. The D channel is relayed.

The main control unit 44 has an I 'line allocation control means 45 in addition to a function of performing various controls relating to incoming and outgoing calls of the mobile station using the database. The I 'line allocation control means 45 variably sets the allocation of each of the D and B channels of the three sets of I' lines to the three PHS carriers. The allocation forms include the following forms. .

(1) D-channel separation B-channel separation type This is composed of six 2B + D lines L1 to L2 as shown in FIG.
L6 is fixedly assigned in advance to PHS carriers X, Y, and Z two lines at a time. Therefore, each PHS operator X,
Y and Z can communicate with the public digital network INW by selectively using the four B channels and the two D channels respectively assigned to themselves. In addition,
Since control of the four B channels can be sufficiently performed by one D channel, one of the two D channels can be used as a spare channel as shown by hatching in the figure.

(2) D channel separation B channel partial sharing type As shown in FIG. 16, for example, three lines L1 to L3 of six 2B + D lines L1 to L6 are connected to each of the PHS operators X, Y and Z. Is fixedly assigned in advance, and the remaining 3
The line is allocated to the three operators X, Y, and Z so that they can be shared.

In this embodiment, each PHS operator X, Y, Z
The maximum number of B channels that can be used is 2 channels fixedly allocated and 6 channels shared, which is a total of 8 channels. Therefore, the number of communication channels that can be simultaneously communicated by one PHS carrier is doubled as compared with the D channel separation B channel separation type, and the degree of freedom in selecting a communication channel is increased.

[0097] Regarding the control channel, D1 of the L1 line is used for the carrier X, and D1 of the L2 line is used for the carrier Y.
2. Each PH to the operator Z such as D3 of L3 line
An independent control channel is assigned to each of the S operators X, Y, and Z. For example, when a mobile station subscribing to the operator X performs communication, the B channel B11 of the L1 line is used.
If both B12s are in use, a vacant B channel is searched from L4, L5 and L6, and if a vacant channel is found, this channel is allocated to the mobile station. Done using.

(3) D channel separation B channel completely shared type This is, for example, as shown in FIG. 17, all the B channels of the 6 2B + D lines L1 to L6 are shared by the PHS operators X, Y and Z. Assigned as possible, D of L1 to L3 lines
A channel is fixedly assigned to each PHS operator X, Y, Z.

In this embodiment, each PHS carrier X, Y, Z
Can use all 12 B-channels each, so the degree of freedom in selecting B-channels is three times that of the above-mentioned D-channel separated B-channel separated type. It is possible that another party's communication occupies the previous 12 channels.

(4) D channel shared B channel separated type This is, for example, as shown in FIG.
One of the D channels, for example, the D channel D1 of the L1 line is allocated to each of the PHS operators X, Y, and Z in a sharable manner. It is fixedly assigned to Y and Z. In this mode, each PHS operator X, Y, Z
The maximum number of B channels that can be used is 4 channels. In addition, control is performed by any of the PHS operators X, Y, and Z by making one D channel D1 interchangeable with each other.

(5) D channel shared B channel partially shared type This is, for example, as shown in FIG. 21, for the B channel, three lines L1 to L6 out of six 2B + D lines L1 to L6
L3 is fixedly assigned in advance to each of the PHS operators X, Y, and Z, and the remaining three lines are assigned to be able to be shared with the three operators X, Y, and Z. For the D channel, one D channel D1 is assigned to each PHS. It is assigned to the operators X, Y, Z so that they can be shared.

In this embodiment, each PHS operator X, Y, Z
The maximum number of B channels that can be used is a total of 8 channels including 2 channels that are fixedly allocated and 6 channels that are shared, so that one PHS carrier can communicate at the same time as compared with the above D channel separation B channel separation type The number of communication channels is doubled.

(6) D channel shared B channel fully shared type This is, as shown in FIG. 22, all the B channels of the lines L1 to L6 are allocated to each of the PHS operators X, Y and Z in a sharable manner, and The D channel L1 of the line L1 is assigned to each of the PHS operators X, Y, and Z in a sharable manner.

In this embodiment, each PHS operator X, Y, Z
Can use all twelve B-channels, so that the degree of freedom in selecting B-channels is three times that of the above-described D-channel separated B-channel separated type. In addition, as for the control channel, one D channel D
1 is used by PHS operators X, Y, and Z with mutual flexibility.

By the way, among the above channel allocation modes, in the mode in which the D channel is shared, for example, the D channel is shared as follows. First, FIG. 19 shows I 'used between a public network INW which is a fixed network and a base station.
FIG. 3 shows an example of multiplexing at Layer 2 of an interface. That is, the format of Layer 2 is a so-called HDLC (High Level D) as shown in FIG.
It is similar to Layer 2 used in the ata Link Control (ATA Link Control) procedure. CRCC (Cyclic Redundancy Check Co
de) is surrounded by a specific bit pattern called a flag. Here, what is used for multiplexing the control signal is the TEI (Terminal Endpo) of the address part.
This area is called an int identifier, and its configuration is shown in FIG. The TEI is used for identifying a path-connected terminal in a normal ISDN basic interface, but is used here for identifying an operator. TE
Since I has a 7-bit configuration, 0 to 127 can be specified in decimal.

Therefore, for example, when transmitting the control signal of the operator X, TEI is set to 0, and when transmitting the control signal of the operator Y, TEI is set to 2; In the case of transmitting a signal, if the TEI is set to be set to 3, it is possible to transmit control signals of a plurality of operators using the same D channel.

On the other hand, FIG. 20 shows an example of multiplexing at layer 3 of the I 'interface used between a public digital network INW, which is a fixed network, and a base station. That is, the format of the layer 3 is composed of a protocol identifier, a call number, a message type, and various information elements as shown in FIG. Here, what is used for multiplexing is a call number value of an area called a call number,
The configuration is shown in FIG. In this example, since the call number value is represented by 7 bits, a value from 0 to 127 can be specified in decimal.

Therefore, as in the case of the TEI,
When transmitting the control signal of the operator X, the call number value is set to 0; when transmitting the control signal of the operator Y, the call number value is set to 2; In the case of transmission, if the call number value is set to 3, the control signals of a plurality of carriers can be transmitted on the same D channel.

As described above, in this embodiment, when one base station is shared by the PHS operators X, Y, and Z, six 2B + D lines L connecting the public digital network INW are used.
Each B channel and D channel of 1 to L6 are connected to each PHS
For the operators X, Y, and Z, an appropriate form is selected and set from various allocation forms.

Therefore, for example, each PHS operator X,
Optimum channel allocation can be performed according to the number of Y and Z subscribers, the average traffic density, and the like.
The line can be used efficiently.

The fourth embodiment can be modified as follows. For example, during operation of the system, the base station monitors the number of mobile stations, traffic, and the like existing in the wireless area for each of the PHS operators X, Y, and Z, and based on the detection result, determines whether each of the PHS operators X , Y, Z may be adaptively variably controlled. By doing so, it becomes possible to use the limited communication channels by each of the PHS operators X, Y, and Z with maximum efficiency.

Further, the number of communication channels allocated to each of the PHS carriers X, Y, Z may be variably set according to a preset time schedule. For example, when the traffic of the operator X is high during the daytime and the traffic of the operator Y is high at the nighttime, the channel allocation numbers for the operators X and Y are switched between daytime and nighttime. By doing so, each PHS operator X, Y, Z
Channel allocation can be performed efficiently in accordance with the tendency of the operating state of the system.

[0113]

[0114]

[0115]

As described above in detail, according to the present invention, at least one shared base connected to a fixed communication network via a plurality of lines is provided in an overlapping area of each service area formed by a plurality of mobile communication networks. A station is provided, and a resource control means is provided in the shared base station, and the resource control means dynamically variably controls allocation of the plurality of lines to the plurality of mobile communication networks.

Therefore, according to the present invention, it is not necessary to install base stations of a plurality of mobile communication networks in an overlapping manner, thereby improving economical efficiency, and connecting a plurality of lines between a base station and a public network. It is possible to provide a mobile communication system and a shared base station device that can be used more efficiently in a mobile communication network to improve line utilization efficiency and reduce a call blocking rate.

[Brief description of the drawings]

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

FIG. 2 is a circuit block diagram showing a configuration of an integrated control device used in the system shown in FIG.

FIG. 3 is a circuit block diagram showing a configuration of a base station used in the system shown in FIG. 1;

FIG. 4 is a circuit block diagram showing a configuration of an integrated control device which is a modified example of the system shown in FIG.

FIG. 5 is a circuit block diagram showing a configuration of a base station as a modification of the system shown in FIG. 1;

FIG. 6 is a schematic configuration diagram of a PHS according to a second embodiment of the present invention.

7 is a circuit block diagram showing a configuration of an integrated control device used in the system shown in FIG.

FIG. 8 is a circuit block diagram showing a main configuration of a modified column of the system shown in FIG. 6;

FIG. 9 is a schematic configuration diagram of a PHS according to a third embodiment of the present invention.

FIG. 10 is a circuit block diagram showing a configuration of an integrated control device used in the system shown in FIG. 9;

FIG. 11 is a circuit block diagram showing a main configuration of a modified column of the system shown in FIG. 9;

FIG. 12 is a circuit block diagram showing a main part configuration of a PHS according to another embodiment of the present invention.

FIG. 13 is a circuit block diagram showing a main part configuration of a PHS according to another embodiment of the present invention.

FIG. 14 is a circuit block diagram showing a main configuration of a PHS according to a fourth embodiment of the present invention.

FIG. 15 is a diagram showing an example of a channel allocation form in the system shown in FIG. 14;

FIG. 16 is a diagram showing another example of a channel allocation form in the system shown in FIG. 14;

FIG. 17 is a diagram showing another example of a channel allocation form in the system shown in FIG. 14;

FIG. 18 is a diagram showing another example of a channel allocation form in the system shown in FIG. 14;

FIG. 19 is a layer format diagram for explaining an example of a D-channel sharing system.

FIG. 20 is a layer format diagram for explaining another example of the D-channel sharing system.

FIG. 21 is a diagram showing still another example of a channel assignment mode in the system shown in FIG. 14;

FIG. 22 is a diagram showing still another example of a channel allocation mode in the system shown in FIG. 14;

FIG. 23 is a schematic diagram showing a basic configuration of a PHS system.

[Explanation of symbols]

INW: Public digital network SNW: Subscribed telephone network PNW: Packet network CC: Management control device for business operators CSa1, CSc1, CSe1, CSg1: Base station CSb1, CSd1, CSf1, CSh1: Simple base station ISa1, ISc1, ISe1, ISg1 ... Integrated controller for existing base station ISb1, ISd1, ISf1, ISh1 ... Integrated controller for simple base station PS1 to PSn ... Mobile station 11, 12, 25, 42 ... I 'line interface 13a, 13b, 13c, 13d, 13e, 13f, 1
3g, 13h, 24, 43 ... switch units 14a, 14b, 14c, 14d, 14e, 14f, 1
4g, 14h: Main control unit of the integrated control device 15, 41: Radio interface 16: I-line interface 17: Subscriber telephone interface 18: PBX interface 22, 32: Radio circuit unit 23, 33 ... Modem codec 26a, 35 ... Radio control unit 27: Main control unit of base station CCS: Shared control unit RS1 to RS3: Radio unit 31: Antenna 34: Interface with shared control unit 44: Main control unit 45: I 'line allocation control unit

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04B ^7/ 24-7/26 H04Q ⁷ /00-7/38

Claims (10)

(57) [Claims] 1. A mobile communication system comprising a plurality of mobile communication networks, each having a service area formed in a predetermined area and operating independently of each other in these service areas, wherein said plurality of mobile communication networks are formed. At least one shared base station connected to a fixed communication network via a plurality of lines is installed in an overlap area of each service area, and the plurality of lines are connected to the plurality of mobile communication networks. A mobile communication system characterized by comprising resource control means for dynamically variably controlling allocation of resources. 2. When the plurality of lines are composed of a plurality of control lines and a plurality of information lines, the resource control means assigns a specific control line of the plurality of control lines to the plurality of mobile communication networks. 2. The mobile communication system according to claim 1, wherein the mobile communication system is allocated as a shared control line, and the other control lines are separately allocated to the plurality of mobile communication networks as dedicated control lines. 3. When the plurality of lines include a plurality of control lines and a plurality of information lines, the resource control means assigns a specific information line of the plurality of information lines to the plurality of mobile communication networks. 3. The mobile communication system according to claim 1, wherein the mobile communication system is allocated as a shared information line, and the other information lines are separately allocated to the plurality of mobile communication networks as dedicated information lines. 4. When the plurality of lines are composed of a plurality of control lines and a plurality of information lines, the resource control means separates the plurality of control lines as dedicated control lines for the plurality of mobile communication networks. 2. The mobile communication system according to claim 1, wherein the plurality of information lines are allocated to the plurality of mobile communication networks as a shared information line. 5. When the plurality of lines include a plurality of control lines and a plurality of information lines, the resource control means separates the plurality of information lines as information lines dedicated to the plurality of mobile communication networks. 2. The mobile communication system according to claim 1, wherein the plurality of control lines are allocated as common control lines to the plurality of mobile communication networks. 6. When the plurality of lines include a plurality of control lines and a plurality of information lines, the resource control means allocates the plurality of control lines to the plurality of mobile communication networks as a common control line. And allocating the plurality of information lines to the plurality of mobile communication networks as a shared information line.
The mobile communication system according to claim 1. 7. The resource control means includes terminal number monitoring means for monitoring the number of mobile stations for each of the mobile communication networks existing in a wireless area formed by its own shared base station. 7. The method according to claim 1, wherein the assignment of the plurality of lines to each of the mobile communication networks is adaptively variably controlled according to the number of mobile stations for each mobile communication network obtained by the method. Mobile communication system. 8. The resource control means includes traffic monitoring means for monitoring traffic for each mobile communication network by mobile stations existing in a wireless area formed by its own shared base station. The mobile communication system according to any one of claims 1 to 6, wherein the assignment of the plurality of lines to each of the mobile communication networks is adaptively variably controlled according to the traffic for each of the mobile communication networks. . 9. The method according to claim 1, wherein the resource control means variably controls the assignment of the plurality of lines to each of the mobile communication networks according to a preset time schedule. Mobile communication system. 10. A service area is formed in each predetermined area, a plurality of mobile communication networks operated independently of each other in these service areas are provided, and a service area of the plurality of mobile communication networks overlaps. The shared base station device used in a mobile communication system in which at least one shared base station device connected to a fixed communication network via a plurality of lines is installed, wherein the plurality of mobile communication networks A shared base station apparatus comprising resource control means for dynamically variably controlling the allocation of a line.