JPH08307928A - Portable telephone system controller, base station and portable telephone system - Google Patents

Abstract

PURPOSE: To connect a channel even if the call channel of a prescribed base station is busy by providing a selection reference storage part storing selection reference to which base station a channel is assigned when plural base stations to which call channels can be assigned exist. CONSTITUTION: An exchange 10 connected to a public network, the base stations (a)-(d) for office, which are connected to the exchange 10, a data base 12 as the selection reference storage part which is similarly connected to the exchange 10 and portable terminals (a)-(d) are provided. Radio connection is realized from the portable terminal (a) and the like through the base station (a) and the like. Namely, the selection reference storage part 12 is provided in the controller of a portable telephone system in the system. When the plural base stations (a)-(d) to which the call channel can be assigned exist, the base stations (a)-(d) to which the communication channel is assigned is selected in accordance with the selection reference stored in the selection reference storage part 12. Thus, a channel connection impossible state in the portable terminals (a)-(d) can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone system, and more particularly to a base station constituting a mobile phone system for business establishments and a system control device for controlling the mobile phone system.

[0002]

2. Description of the Related Art A second-generation cordless telephone system (personal handy phone system: PHS) is used as a mobile telephone system that can make a call using a single mobile telephone in all situations of home, office, and outdoors. Practical application is in progress. Here, a mobile phone system for business offices is being developed in PHS. The mobile phone system for business offices in PHS is a private branch exchange connected to a public network and one or a plurality of private branch exchanges connected to the private branch exchange. It has a business base station, and each mobile phone is wirelessly connected to the business base station. Here, when a call request is made from the mobile phone, a link channel request is made to a predetermined base station according to the reception level, etc., and the link channel is sent from the exchange side via the base station accordingly. Assignments are made.

Further, in a mobile phone system in which a home base station or a public base station is connected to a public network and a call is made by the mobile phone via the home base station or the public base station, a call request is issued from the mobile phone. In this case, a link channel request is made via a predetermined base station according to the reception level and the like, and in response to this, a link channel allocation is made from the public network side via the base station.

Further, as a conventional technique, a handover for allocating a wireless communication channel is disclosed in Japanese Patent Laid-Open No. 4-1.
As disclosed in Japanese Patent No. 85026, one in which the handover criterion is changed according to the line usage rate,
As shown in Japanese Patent No. 164477, an example is known in which the handover criterion is changed based on the call channel usage rate of the handoff source and the call channel usage rate of the handoff destination.

[0005]

However, there is a limit to the number of communication channels in a base station such as a business base station,
Even if a call request is made via a certain base station, the call line cannot be connected if all the call channels are used. In addition, when the number of location registrations in a certain base station is larger than that in other base stations, it is expected that the number of incoming calls to the mobile phone via that base station will increase, so that other wireless connections are possible. It is desirable to connect wirelessly via a base station. Even if the number of communication lines used is larger than that of other base stations, it is desirable that other base stations be used for wireless connection. Further, when the mobile phone is moving, if a link channel is assigned by a base station close to the moving destination, it is not necessary to perform unnecessary handover.

Therefore, according to the present invention, even if a communication channel of a certain base station is blocked, a line connection can be established and useless handover can be prevented, and a mobile telephone system control device and a base station, and further, It is intended to provide a mobile phone system including these.

[0007]

The present invention was created to solve the above problems, and, firstly, a mobile phone system connected to a plurality of base stations wirelessly connected to a mobile terminal. The control device is characterized by having a selection criterion storage unit 12 that stores a selection criterion for selecting which base station to assign when there are a plurality of base stations that can be assigned to a communication line. The second feature is that it further has a selection unit that selects a base station to be assigned according to the selection criterion stored in the selection criterion storage unit.

A third feature is that the selection criterion storage unit stores, for each base station, the number of mobile terminals whose location is registered in each base station. Fourthly, the selection criterion storage unit stores the number of usable lines for each base station. A fifth feature is that the selection criterion storage unit stores, for each mobile terminal, one or a plurality of base stations to which line allocation is performed. A sixth feature is that, when a plurality of base stations store a certain mobile terminal, the mobile terminals are stored with priorities. A seventh feature is that the selection criterion storage unit stores a plurality of movement patterns of the mobile terminal and one or a plurality of base stations defined according to the movement patterns.

Eighthly, the mobile phone system is a base station wirelessly connected to a mobile terminal, and receives a line connection request transmitted from the mobile terminal and not addressed to the base station. It is characterized by transmitting to the control device.
Ninth, a mobile phone system is characterized by including the mobile phone system control device having any one of the first to seventh configurations and the base station having the eighth configuration.

[0010]

In the mobile phone system control device of the first configuration and the mobile phone system control device of the eighth configuration of the present invention, since the selection criterion storage section 12 is provided, the base station capable of assigning a communication line is provided. When there are a plurality of items, the base station to which the communication line is assigned is selected according to the selection criterion stored in the selection criterion storage unit. For example,
In the case of the second configuration, the selection unit selects the base station. As a result, it is possible to avoid the line connection failure state in the mobile terminal by allocating the call channel to a base station other than the base station whose call line is blocked.

Further, particularly in the case where the selection criterion storage unit stores the number of mobile terminals whose position is registered in each base station as in the case of the third configuration, the base station with a small number of position registrations is used. Can be prevented from blocking all the communication channels of a certain base station. Further, in particular, when storing the number of usable lines for each base station in the selection criterion storage unit as in the above-mentioned fourth configuration, by assigning to the base station having a large number of usable lines, It is possible to prevent all the communication channels of a certain base station from being blocked.

Further, in particular, like the fifth and sixth configurations, line allocation is performed for each mobile terminal 1
Alternatively, if a plurality of base stations are stored, for example, by storing a base station at a place where a certain mobile terminal is likely to be located, useless handover is not necessary and registration is performed. By averaging and registering the base stations for each mobile terminal, it is possible to prevent the communication channel of a certain base station from being blocked. In particular, when storing one or a plurality of base stations according to the movement pattern of the mobile terminal as in the case of the seventh configuration, there is a high possibility that the base stations in the movement destination area are assigned. Therefore, useless handover is not necessary, and if the base stations to be registered are averaged and registered for each movement pattern, it is possible to prevent the communication channel of a certain base station from being blocked.

In the base station of the eighth structure and the mobile phone system control device in the system of the ninth structure, a line connection request not addressed to itself is received and transmitted to an external mobile phone system control device. To do. Then, on the side of the mobile phone system control device, there are a plurality of base stations that can perform call line allocation. Therefore, any one of the base stations can be selected according to the criteria shown in the third to seventh configurations. select.

[0014]

Embodiments of the present invention will be described with reference to the drawings.
The mobile phone system according to the present invention is a so-called mobile phone system for business use, and is configured as shown in FIG. That is, the exchange 10 connected to the public network and the office base stations a, b, c connected to the exchange 10
database 1 connected to the exchange 10 in the same manner as "d", etc.
2 and mobile terminals a, b, c, d, etc.
And the like are wirelessly connected via the base station a and the like.

The base station a and the like have a function of receiving a call request signal addressed to a base station other than its own base station and transmitting it to the exchange 10. Further, the database 12 is provided with each table such as a position registration number table, a used channel table, a priority base station table, and a movement prediction table as a selection criterion storage unit. Here, as shown in FIG. 4, the number of position registrations at each base station is stored in the position registration number table. Also,
As shown in FIG. 5, the usable channel table stores the number of usable communication channels at each base station at that time. The information in the position registration number table and the used channel table is sequentially rewritten as the position registered number and the used channel number of each base station change.

The priority base station table shown in FIG.
As shown in FIG. 6, each mobile terminal stores the base station to which the link channel is to be assigned in order of priority. For example, according to the example of FIG. The first rank is stored, and the base station b is stored as the second rank. As an example of providing this table, for example, when a staff member of a business office or the like has a mobile terminal, a base station at a place where the owner of the mobile terminal is likely to be registered is registered in the priority base station table. I'll do it. Specifically, it is conceivable that the base station located in the seat of the member has the first priority, and then the base station located in the conference room has the second priority.

In addition, as shown in FIG. 7, the movement prediction table stores one or a plurality of movement-destination base stations predicted in advance according to the movement pattern of the portable terminal. For example, as shown in FIG. 2, when the mobile terminal a moves from the area of the base station e to the area of the base station d, the mobile terminal a is the area of the base station a or the area of the base station b. The base station a and the base station b are registered in advance by predicting that the process will proceed to step. That is, in the table shown in FIG. 7, when the mobile terminal moves from the base station a to the base station d, the base station e is registered as the moving destination ahead of which is the base station e. For example, in a base station installed in a building, the movement pattern of the mobile terminal can be known to some extent because the base station is installed in a corridor, etc. Therefore, this movement prediction table is effective in the mobile phone system for offices. .

The exchange 10 receives, when a call request from a portable terminal is received by a plurality of base stations and transmitted,
It has a function of selecting a base station to which a link channel is to be allocated according to the information registered in each of the tables provided in the database 12 and transmitting a link channel allocation signal to the base station. That is, the exchange 10 also has a function as a selection unit.

The operation of the mobile phone system having the above configuration will be described with reference to FIGS. First, it is assumed that a call request is made from a mobile terminal via a predetermined base station. For example, assume that a call request is issued from the mobile terminal a. In this case, it is assumed that the mobile terminal a makes a call request to the base station a, that is, a link channel establishment request, depending on the reception level with each base station. Then, the link channel establishment request is received by the base station a (S1) and transmitted from the base station a to the exchange 10 (S2).

On the other hand, the link channel establishment request addressed to a predetermined base station may be received by another base station, and in this case, the received base station transmits it to the exchange 10. For example, when the above-mentioned link channel establishment request addressed to the base station a is received by the base station b, the base station b also issues a link channel establishment request addressed to this base station a.
To (S3, S4). Then, when the link channel establishment request is transmitted from a plurality of base stations, there are a plurality of base stations to which the link channel can be allocated. Therefore, from which base station the switch 10 allocates the link channel. To judge. That is, the base station to which the link channel is assigned is selected.

There are various methods for selecting the base station as follows. First, the first is a method of selecting according to the information stored in the position registration number table shown in FIG. That is, of the selectable base stations, the base station with the smaller number of location registrations of the mobile terminal is selected. The large number of location registrations is expected to result in many cases of incoming calls at mobile terminals that are location-registered, and it is desirable to leave the call channels free accordingly. Therefore, when the selectable base stations are the base station a and the base station b as in the above example, the base station with the smaller number of position registrations is selected and the link channel is assigned to the base station. To do. For example, when the number of location registrations of the base station b is smaller than that of the base station a, the link channel is allocated to the base station b (see S5 in FIG. 3).

Secondly, there is a method of selecting according to the information stored in the used channel table shown in FIG. That is, the number of free channels is calculated from the number of used channels of each base station, and a base station with a large number of free channels is selected. By doing this, even if there is no free channel in the base station that made the link channel establishment request, it is possible to connect the line via another base station, and make sure that there is no free channel in a certain base station. It can be avoided as much as possible. Therefore, when the selectable base stations are the base station a and the base station b as in the above example, the base station having the most available channels is selected and the link channel is assigned to the base station. . For example,
When the base station b has more free channels than the base station a, the link channel is allocated to the base station b (see S5 in FIG. 3).

Thirdly, there is a method of selecting according to the information stored in the priority base station table shown in FIG. In other words, the priority base station table stores, for each mobile terminal, the base stations to which the link channel should be assigned, and the selection is performed according to this order. Specifically, according to the priority base station table of FIG.
Consider, for example, the case where the mobile terminal a makes a link channel establishment request via the base station b, and the base station a also receives the link channel establishment request addressed to this base station b.
Since 0 is a link channel establishment request from the mobile terminal a, the base station a is selected according to the priority base station table to perform link channel allocation. When the link channel establishment request from the mobile terminal a is received by the base station b and the base station c, the base station b is assigned.

By the above, since the allocation is performed from the base station with a high probability where the owner of the portable terminal is located, useless handover is prevented, and the priority base station table is provided. By averaging the base stations registered for each mobile terminal, it is possible to prevent the communication channel from being blocked for a certain base station. For example, grouping multiple mobile terminals,
If the mobile terminals belonging to a certain group have the base station a as the first priority and the mobile terminals belonging to a certain group have the base station b as the first priority, the assigned base stations are averaged and the call is made. The channel can be prevented from being blocked.

Fourthly, there is a method of selecting according to the information stored in the movement prediction table shown in FIG. That is, since a plurality of movement patterns are predetermined in the movement prediction table and the movement prediction base station is registered in accordance with each movement pattern, when the mobile terminal moves, the movement prediction table is registered in the movement prediction table. If it corresponds to any of the selected movement patterns, link channel allocation is performed from the movement prediction base station registered according to the movement pattern.

More specifically, a base station d and a base station e are two base stations to which a link channel establishment request is issued from the mobile terminal a and link channel allocation is possible, and the mobile terminal a is the base station a. When moving from the area of 1 to the area of the base station d, since the base station e is registered in the movement prediction table (see FIG. 7), the link channel is assigned to the base station e. .

By the above, since the allocation is performed from the base station which is expected to move the portable terminal, useless handover is prevented. Also, by averaging the base stations registered in the movement prediction table for each movement pattern, it is possible to prevent the communication channel of a certain base station from being blocked.

Next, in the exchange 10, when one base station is selected from a plurality of base stations capable of link channel allocation, the link channel allocation is transmitted to the selected base station, and the base station issues the link channel allocation. Link channel allocation is performed for the mobile terminal that made the call request. For example, in the example shown in FIG. 3, the link channel is assigned to the base station b (S5), and the link channel is assigned from the base station b to the mobile terminal a (S6). At that time, when allocating the link channel, since the mobile terminal a first requests the link channel establishment to the base station a, the link channel allocation signal is transmitted with the ID of the base station a. The processing from the link channel establishment request to the link channel allocation is performed via the control channel.

When the link channel is assigned to the mobile terminal, the line connection processing is performed thereafter via the base station to which the link channel is assigned. That is,
In the example shown in FIG. 3, call setup (see S7 and S8) from the mobile terminal a, call setup acceptance (see S9 and S10) from the exchange 10 and call (see S11 and S12) are performed via the base station b. After the response (see S13 and S14) is made, the telephone line can be connected. In addition, when the base station to which the link channel is assigned is selected, the process of changing the location registration to the base station is also performed. At that time, in the position registration number table (see FIG. 6), the number of position registrations for the newly registered base stations is increased by one, and the number of position registrations of the base stations registered for position is decreased by one. Become.

In the above embodiment, it is explained that the link channel allocation is performed by each of the first to fourth methods, but when one base station cannot be selected by a certain method, another method is used. You may make it complement by the method of.
For example, when selection is performed using the above-mentioned location registration number table, if the number of location registrations in the selectable base stations is the same, the base station having the more vacant channels is selected by the used channel table. In addition, when selection is performed using the movement prediction table, if both selectable base stations are registered as movement prediction base stations, the number of location registration terminals is reduced using the location registration number table. Select a base station.

Further, when selection is performed using the priority base station table or the movement prediction table, there are a plurality of base stations to which link channels can be allocated, and the base stations that can be allocated and the base stations registered in each table. If and do not match at all, the allocation may be performed secondarily using the position registration number table or the used channel table.

Further, although it has been described that the number of channels currently used is stored in the used channel table (see FIG. 5) in the above embodiment, the number of usable channels is stored for each base station. You may do it.
Further, in the priority base station table shown in FIG. 6, a plurality of base stations to which link channel allocation is to be performed are stored with priorities. The ranking may not be set. When only one base station has received the link channel establishment request, the link channel is assigned to that base station without needing to adopt the method of the above embodiment.

Further, although the above embodiment has been described as a portable telephone system for business use, it is not limited to this. For example, a home base station or public base station is connected to a public network, and the home base station or public base station is connected. It is also applicable to a mobile phone system in which a mobile terminal is wirelessly connected via a station. That is, a system control device is provided in the public network, and a database having the same configuration as the database 12 is provided in this system control device so that the system control device can perform the processing performed by the exchange 10 in the above embodiment.

[0034]

According to the portable telephone system control device according to any one of claims 1 to 4 and the portable telephone system control device in the system according to claim 9 based on the present invention,
By assigning a call channel to a base station other than the base station where the call line is blocked, it is possible to avoid the line connection failure state in the mobile terminal.

Further, in particular, as in the case of claim 5 or claim 6, if one or a plurality of base stations for line allocation are stored for each mobile terminal, a mobile terminal is located. By storing the base stations in places where there is a high possibility that they will be stored, unnecessary hand-overs will not be necessary, and if the base stations to be registered are averaged and registered for each mobile terminal, the call channel of the base station Can be prevented from being blocked. Further, in particular, as described in claim 7, when one or a plurality of base stations are stored according to the movement pattern of the mobile terminal, there is a high possibility that the base stations in the destination area are assigned. Therefore, useless handover is not necessary, and if the registered base stations are averaged for each movement pattern and registered, it is possible to prevent the communication channel of a certain base station from being blocked.

Further, since the base station according to claim 8 and the base station in the system according to claim 9 receive a line connection request not addressed to itself, and transmit it to an external portable telephone system control device. Since the mobile phone system controller has multiple base stations that can allocate call lines, selecting one of the base stations prevents all call channels from being in use. can do.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a mobile phone system according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining an operating state of the mobile phone system according to the embodiment of this invention.

FIG. 3 is a sequence diagram illustrating an operation of the mobile phone system according to the embodiment of this invention.

FIG. 4 is an explanatory diagram showing a configuration of a position registration number table provided in a database.

FIG. 5 is an explanatory diagram showing a configuration of a used channel table provided in a database.

FIG. 6 is an explanatory diagram showing a configuration of a priority base station table provided in a database.

FIG. 7 is an explanatory diagram showing a configuration of a movement prediction table provided in a database.

[Explanation of symbols]

 10 Switch 12 Database

Claims (9)

[Claims] 1. A mobile phone system control device connected to a plurality of base stations wirelessly connected to a mobile terminal, wherein when there are a plurality of base stations to which call lines can be allocated, which base station is to be allocated. A mobile phone system control device comprising a selection criterion storage section (12) for storing selection criteria to be selected. 2. The mobile phone system control device further comprises:
2. The mobile phone system control device according to claim 1, further comprising a selection unit that selects a base station to be assigned according to the selection criterion stored in the selection criterion storage unit. 3. The selection criterion storage unit, for each base station of a plurality of base stations connected to the mobile phone system control device,
3. The mobile phone system control device according to claim 1, wherein the number of mobile terminals whose location is registered in each base station is stored. 4. The selection criterion storage unit, for each base station of a plurality of base stations connected to the mobile phone system control device,
4. The mobile phone system control device according to claim 1, wherein the number of usable lines is stored. 5. The mobile phone system according to claim 1, wherein the selection criterion storage unit stores, for each mobile terminal, one or a plurality of base stations that perform line allocation. Control device. 6. The mobile phone system control device according to claim 5, wherein when a plurality of base stations are stored for a certain mobile terminal, the base stations are stored with priorities. 7. The selection criterion storage unit stores a plurality of movement patterns of a mobile terminal and one or a plurality of base stations defined according to each movement pattern. 7. The mobile phone system control device according to any one of 6 above. 8. A base station wirelessly connected to a mobile terminal, which receives a line connection request transmitted from the mobile terminal and not addressed to the base station, and transmits the line connection request to the mobile phone system control device. A base station characterized by the above. 9. A mobile phone system comprising the mobile phone system control device according to claim 1 and the base station according to claim 8.