JPH05328436A - Portable telephone system - Google Patents

Abstract

PURPOSE:To report position information of a radio base station having an idle channel to a subscriber when all channels of a radio base station are busy by reporting position information of a radio base station noticed by an exchange to a portable telephone set of a call request sender. CONSTITUTION:When a subscriber possessing a portable telephone set 1c is going to make a call from an area covered by a radio base station #1 (2a) and since all channels of the radio base station #1 (2a) are busy the connection is disable, position information of a radio base station #2 (2b) having an idle channel and located closest to the radio base station # 1 (2a) is reported to the portable telephone set 1c. Thus, the subscriber possessing the portable telephone set 1c moves in an area covered by the noticed radio base station #2 (2b), then the connection is enabled.

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 using a mobile phone in which a subscriber part is wireless.

[0002]

2. Description of the Related Art For mobile phone systems, "-Special Issue-Evolving Personal Communication" (NIKKEI COMM)
UNISIONS 1991. 2.18, P52-7
In 2), the basic concept of the pocket telephone proposed by NTT (Nippon Telegraph and Telephone Corporation) is described.

A pocket telephone is an image of a public version of a cordless telephone that can be used both indoors and outdoors.
A wireless base station corresponds to a base unit of a cordless phone, and a mobile phone corresponds to a handset. Then, it has been proposed to use an optical fiber for a communication line from the exchange to the radio base station and make full use of optical communication technology such as wavelength division multiplexing.

In the mobile phone system constructed based on such a concept, the wireless base station uses a small amount of electric power (about 1/100 of that of a car phone) for effective use of radio waves.
It will be installed in each small area (about 100 m). In addition, the wireless base station and the mobile phone will be downsized to the size of a home cordless.

Therefore, in such a mobile phone system, since the radio base station does not require a large area for installation, it is attached to the wall surface of a building or a public telephone box, for example. , It becomes easy to install in each small area.

[0006]

On the other hand, the number of mobile phones connected to the wireless base station, that is, the number of channels connecting the wireless base station and the mobile phone is predetermined, and all the channels are used. Then, the wireless base station cannot be connected to the mobile phone, and the subscriber who has the mobile phone cannot make a call in the area of the wireless base station.

As described above, since the subscriber cannot know how many channels are currently used by the radio base station covering the area in which he / she is located, However, if the wireless base stations are crowded and you are unlucky, you will encounter many busy encounters, and the serviceability will be poor.

Therefore, in such a case, if it is possible to notify the subscriber of the position information of the radio base station having an unused channel, the subscriber who wants to make an emergency call is It becomes possible to leave the area in which the wireless base station is present and to make the call from within the area covered by the notified wireless base station, thus improving the serviceability.

An object of the present invention is to provide position information of a radio base station having an unused channel when all the channels of the radio base station covering an area where a subscriber who has a mobile phone is in use. , To enable notification to the subscriber.

[0010]

[Means for Solving the Problems] To achieve the above object,
In the present invention, when a call is requested from a mobile phone, if all the channels of the own radio base station are used, the exchange is notified so as to notify the position information of the radio base station having the unused channel. Requesting means for
The wireless base station is provided with a notifying means for notifying the mobile phone of the transmission request source of the position information of the wireless base station notified from the exchange.

A first storage means for storing, for each of the plurality of radio base stations, whether or not the channel is used, and a first storage means for storing the position information of the radio base station for each of the plurality of radio base stations. When the storage unit 2 and the radio base station request to notify the location information of the radio base station having the unused channel, the location information of the radio base station having the unused channel is searched. The exchange is provided with a search unit and a notification unit that notifies the wireless base station of the request source of the position information of the searched wireless base station.

Further, a display means for displaying the position information of the wireless base station notified from the wireless base station is provided in the mobile phone.

Note that the wireless base station may be provided with display means for displaying the position information of the wireless base station notified from the exchange.

[0014]

In the radio base station, when all the channels are used, even if a call request is made from the mobile phone, it cannot be connected to the mobile phone.

Therefore, in the radio base station, the requesting means requests the exchange to notify the position information of the radio base station having an unused channel.

In the exchange, when the wireless base station is requested to notify the position information of the wireless base station having the unused channel, the search means is provided with the wireless base station having the unused channel. The location information is searched, and the notifying unit notifies the location information of the searched wireless base station to the requesting wireless base station.

In the radio base station, the notification means is
The position information of the wireless base station notified from the exchange is notified to the mobile phone as the call originator.

In the mobile phone, the display means displays the position information of the wireless base station notified from the wireless base station.

As a result, when all the channels of the radio base station that covers the area where the subscriber who has the mobile phone is used, the position information of the radio base station having the unused channel is added to the subscriber. It is possible to notify the person.

The location information of the radio base station having the unused channel may be one or two or more.

[0021] Further, if the location information of the radio base station which is the closest to the radio base station having an unused channel and covering the area where the subscriber is located is notified, Serviceability is further improved.

To this end, the second storage means stores, for each radio base station, the position information of other radio base stations in the order of the shortest distance from the radio base station, and the search means stores the position information. It suffices to retrieve the position information of the wireless base station that has the unused channel and is closest to the requesting wireless base station.

The position information may be, for example, the direction, distance, and / or distance from the wireless base station to another wireless base station.
Alternatively, it may be a place where another wireless base station is attached.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram of the portable telephone system of this embodiment.

In FIG. 2, the exchange 3 and the radio base station # 1
(2a), wireless base station # 2 (2b), wireless base station # 3
The wireless base station # 1 (2a) and the wireless base station # 2 (2c) are connected to each other via the communication line.
b) and the radio base station # 3 (2c) each have two channels for transmitting and receiving a call signal. Further, in FIG. 2, two mobile phones 1a and 1b are connected to the radio base station # 1 (2a) by using a channel,
One mobile phone 1d uses a channel to make a radio base station # 3
It shows a state of being connected to (2c). The wireless base station # 1 (2a), the wireless base station # 2 (2b), and the wireless base station # 3 (2c) are miniaturized as described above, and the wall surface of the building or the public telephone. It is attached to the box.

In this state, when the subscriber who carries the mobile phone 1c tries to make a call from within the area covered by the radio base station # 1 (2a), the radio base station # 1 (2
Since all the channels of a) are blocked, connection is impossible.

In the present embodiment, in such a case, the mobile phone 1c has an idle channel and the radio base station closest to the radio base station # 1 (2a). The location information of # 2 (2b) is notified, so that if the subscriber who owns the mobile phone 1c moves into the area covered by the notified wireless base station # 2 (2b), You can see that you can connect.

Therefore, in the present embodiment, the exchange 3 has a free / busy management table 400 for storing the free / busy state of channels in the wireless base station 2, and the wireless base station 2
Wireless base station table 300 for storing the position information of

FIG. 3 is a block diagram of the radio base station table 300.

As shown in FIG. 3, the radio base station table 3
00 indicates, for each wireless base station 2, the direction and distance from the own wireless base station 2 to the other wireless base station 2, the place where the other wireless base station 2 is attached, and the proximity from the own wireless base station 2. It is stored in the order of distance.

FIG. 4 is a block diagram of the air-tightness management table 400.

As shown in FIG. 4, the empty / closure management table 40.
0 stores the vacant / closed state of the channel for each radio base station 2, and also stores the number of channels and the number of used channels (the number of channels in the closed state) for each radio base station 2.

Next, an outline of the operation of this embodiment will be described.

FIG. 1 is a sequence diagram showing an outline of the operation of this embodiment.

As shown in FIG. 1 (a), first, when a call request is made in the mobile phone 1 when all channels of the radio base station 2 are not blocked, the mobile phone 1 switches the control channel. Then, the link channel establishment request signal 101 is transmitted to the radio base station 2. In addition to the channel, the wireless base station 2 actually
Channel for sending and receiving control signals (control channel)
And uses the control channel to transmit / receive control signals to / from the mobile phone 1.

Upon receiving the link channel establishment request signal 101 from the mobile phone 1, the radio base station 2 captures a channel as shown in the flowchart of FIG. 5 (step 501). That is, the wireless base station 2
The vacant / closed state of the channel is stored, and the vacant channel is updated to the closed state based on the stored contents. Here, since the channel can be captured (step 502), the link channel assignment signal 102 is transmitted to the mobile phone 1 using the control channel (step 503).

After that, the radio base station 2 exchanges a control signal with the mobile phone 1 in accordance with a normal call connection sequence, and when receiving the call setting signal 103 from the mobile phone 1, SETUP is sent to the exchange 3. The signal 104 is transmitted.

The exchange 3 receives the SETUP from the radio base station 2.
When the signal 104 is received, the channel of the wireless base station 2 which is the transmission source of the SETUP signal 104 is captured. That is, the exchange 3 refers to the free / busy management table 400, updates the channel in the free state to the closed state, and
Count up the number of channels used. Here, since the channel can be captured, thereafter, a control signal is exchanged with the radio base station 2 and the other exchanges in accordance with a normal call connection sequence, and a call state is established.

Now, as shown in FIG. 1 (b), when all channels of the radio base station 2 are in a blocked state,
When a call request is made in the mobile phone 1, the mobile phone 1
Transmits a link channel establishment request signal 105 to the wireless base station 2 using the control channel.

Upon receiving the link channel establishment request signal 105 from the mobile phone 1, the radio base station 2 acquires a channel as shown in the flowchart of FIG. 5 (step 501). Here, since it is not possible to capture the channel (step 502), in order to have the wireless base station 2 which has an empty channel and is the closest to the wireless base station 2 from the own wireless base station 2. , INFO.D (vacant radio base station information request) signal 10 to the exchange 3.
6 is transmitted (step 504).

The exchange 3 is connected to the INFO.
When the D signal 106 is received, as shown in the flowchart of FIG. 6, the wireless base station which has an idle channel and is the closest to the wireless base station 2 which is the transmission source of the INFO.D signal 106. Search for 2. That is,
The exchange 3 refers to the radio base station table 300 and
Other radio base stations 2 are searched in the order of short distance from the radio base station 2 which is the source of the FO.D signal 106 (step 60).
1) With reference to the air-tightness management table 400, it is determined whether or not the searched wireless base station 2 has an idle channel (step 602). In this way, there is an idle channel and IN
When the nearest wireless base station 2 is searched from the wireless base station 2 that is the transmission source of the FO.D signal 106, the wireless base station 2 that has been searched for the wireless base station 2 that is the transmission source of the INFO.D signal 106. INFO.D (vacant radio base station information notification) signal 107 including the position information of (step 60)
3).

The radio base station 2 receives the INFO.
When the D signal 107 is received, as shown in the flowchart of FIG. 5, the position information of the wireless base station 2 included in the INFO.D signal 107 is included in the link channel assignment refusal signal 108, and the mobile phone 1 receives the position information. It transmits to (step 505).

The link channel allocation refusal signal 10
8 has a format as shown in FIG. 8A, and the position information of the wireless base station 2 can be set in the option part (10 bits). As a setting method, for example, as shown in FIG. 8B, 1 to 3 bits of the option part can be used as the direction and 4 to 5 bits can be used as the distance. That is, to the numbers 0 to 7 that can be represented by 1 to 3 bits, north,
Assign northeast, east, southeast, south, southwest, west, northwest, 4-5
The number of 0 to 3 that can be represented by bits is set as a distance of 100 m unit.

When the mobile phone 1 receives the link channel assignment refusal signal 108 from the radio base station 2, the radio base station 2 included in the link channel assignment refusal signal 108.
Display the location information of.

FIG. 7 is a diagram showing an example in which the position information of the wireless base station 2 is displayed on the mobile phone 1.

In FIG. 7A, the direction and distance from the radio base station 2 covering the area where the mobile phone 1 is located to the radio base station 2 having an idle channel are shown. it's shown. This allows the mobile phone 1
At a glance, subscribers who have a phone call can make a call by moving about 100 m to the north. At this time, it is convenient if the mobile phone 1 is provided with a compass.

Further, in FIG. 7B, the place where the radio base station 2 having the channel in the empty state is attached is displayed. From this, it can be seen at a glance that the subscriber who has the mobile phone 1 can make a call by moving to the station in front of XX station.

As described above, according to the present embodiment, the subscriber who carries the mobile phone 1 can operate even if all the channels of the radio base station 2 covering the area in which he / she is located are blocked. It becomes possible to know the wireless base station 2 which has the channel in the idle state and which is the closest to the wireless base station 2. Therefore, particularly when making an emergency call, it is sufficient to move to the area covered by the radio base station 2, so that busy encounters will not be repeated. In the mobile phone system of the related art, the wireless base station 2 is installed every several km, but in the mobile phone system of the present embodiment constructed based on the concept described above, the wireless base station 2 is used. Since the station 2 is installed every 100 m, it is easy.

In the radio base station 2, the mobile phone 1
Similarly to the above, the position information of the wireless base station 2 notified from the exchange 3 may be displayed, or the mobile phone 1
Instead of displaying the
You may make it display the positional information on the wireless base station 2 notified from.

Further, the exchange 3 is connected to the SE from the radio base station 2.
If the value becomes equal to the number of channels when the number of channels used in the free / busy management table 400 is counted up after receiving the TUP signal 104, it means that all the channels are in a blocked state. At this time, the position information of the wireless base station 2 may be notified. In this case, the wireless base station 2 stores the position information of the wireless base station 2 notified from the exchange 3 and stores the wireless information stored when the link channel establishment request signal 105 is received from the mobile phone 1. The position information of the base station 2 is included in the link channel assignment refusal signal 108 and is transmitted to the mobile phone 1.

Further, the exchange 3 may periodically notify the radio base station 2 of the position information of the radio base station 2. Also in this case, the wireless base station 2 stores the position information of the wireless base station 2 notified from the exchange 3,
When the link channel establishment request signal 105 is received from the mobile phone 1, the stored position information of the wireless base station 2 is included in the link channel allocation refusal signal 108,
It is transmitted to the mobile phone 1.

The radio base station table 300 may store the number of channels in the free / busy management table 400 which are in an empty state (the number of channels-the number of used channels). In addition to the position information of the wireless base station 2, the number of available channels may be notified to the wireless communication terminal 2.

Further, the exchange 3 may notify the radio base station 2 of the position information of a plurality of radio base stations 2.

FIG. 7 (c) shows an example in which the position information (direction, distance, installed location) of a plurality of radio base stations 2 and the number of channels in the vacant state are displayed. .. When the amount of position information of the wireless base station 2 notified to the mobile phone 1 is large as in this case, the option part may be extended in the format of the link channel assignment refusal signal 108 shown in FIG. .. Also,
Although this display example is a display example on the mobile phone 1, as described above, when the position information of the wireless base station 2 is also displayed on the wireless base station 2, when the wireless base station 2 displays the positional information of FIG. You may make it display as shown in (c), and may be made to display as shown in FIG.7 (a) or FIG.7 (b) in the mobile telephone 1.

Further, in this embodiment, the mobile phone 1
The subscriber will move to the area covered by the wireless base station 2 by looking at the position information of the wireless base station 2 displayed on the. It is possible that it will be blocked. In preparation for such a case, in this embodiment, it is possible to reserve a channel of the radio base station 2 that covers the area after the movement. That is, for example, when the subscriber inputs the number indicating the reservation request and the telephone number of the mobile phone 1 owned by him / her in order to reserve the displayed channel of the wireless base station 2, the exchange 3 causes the wireless communication to be performed. The channel of the base station 2 is updated to the closed state, and the telephone number input by the subscriber and the channel number updated to the closed state are stored in association with each other. Then, after the subscriber moves to the area covered by the radio base station 2, the subscriber inputs the number indicating the reservation execution and the telephone number of the mobile phone 1 owned by the subscriber, whereby the normal call connection sequence is started. . At this time, the exchange 3 measures the time from the reservation request to the reservation execution in order to prevent the channel from being occupied for a long time, and cancels the reservation when a predetermined time has elapsed. Preferably.

In this embodiment, the number of channels is two, but the number of channels is not a constraint. Further, although the present embodiment has been described with respect to the embodiment applied to the mobile phone system, it can be applied to any system as long as it is a wireless communication system that transmits and receives data using a wireless transmission path.

[0058]

As described above, according to the present invention,
A subscriber who has a mobile phone, even if all the channels of the radio base station that covers the area where he is
Since it is possible to know the position information of the wireless base station having an unused channel, if the user moves to an area covered by the wireless base station, it becomes possible to make a call, and the effect that the serviceability is improved is obtained. is there.

[Brief description of drawings]

FIG. 1 is a sequence diagram showing an operation outline of the present embodiment.

FIG. 2 is a configuration diagram of a mobile phone system according to the present embodiment.

FIG. 3 is a configuration diagram of a radio base station table.

FIG. 4 is a configuration diagram of an empty / closure management table.

FIG. 5 is a processing flowchart of a radio base station when a link channel establishment request signal is received from a mobile phone.

FIG. 6 is a processing flowchart of the exchange when an INFO.D (free radio base station information request) signal is received from the radio base station.

FIG. 7 is an explanatory diagram showing an example in which position information of a wireless base station is displayed on a mobile phone.

FIG. 8 is an explanatory diagram showing a format of a link channel allocation refusal signal.

[Explanation of symbols]

1a, 1b, 1c, 1d ... Mobile phones, 2a, 2b, 2c
... radio base stations, 3 ... exchanges, 101, 105 ... link channel establishment request signals, 102 ... link channel assignment signals, 103 ... call setup signals, 104 ... SETUP signals, 1
06 ... INFO.D (vacant radio base station information request) signal,
107 ... INFO.D (vacant radio base station information notification) signal, 108 ... Link channel allocation refusal signal, 300 ...
Radio base station table, 400 ... Vacant block management table.

Claims (9)

[Claims] 1. A radio base station using an exchange, a plurality of radio base stations installed in each area, which are connected to the exchange via a transmission line, and a part of a plurality of channels on the radio transmission line. In a mobile phone system having a mobile phone connected to a station, if a call is requested from the mobile phone, if all channels of the own radio base station are used, a radio base having an unused channel Requesting means for requesting the exchange to notify the location information of the station, and notifying means for notifying the mobile phone of the call originator of the location information of the wireless base station notified from the exchange, First storage means provided in the base station for storing, for each of the plurality of wireless base stations, whether or not a channel is used, and for each of the plurality of wireless base stations, storing position information of the wireless base station. Second storage means for storing the position information of the wireless base station having the unused channel when the wireless base station is requested to notify the position information of the wireless base station having the unused channel. Position information of the wireless base station notified from the wireless base station, the search means for searching and a notification means for notifying the wireless base station of the request source of the positional information of the searched wireless base station are provided in the exchange. A mobile phone system characterized in that display means for displaying is provided on the mobile phone. 2. The mobile phone system according to claim 1, wherein display means for displaying position information of the wireless base station notified from the exchange is provided in the plurality of wireless base stations. Telephone system. 3. An exchange, a plurality of radio base stations installed in each area connected to the exchange via a transmission line, and the radio base using one part of a plurality of channels on the radio transmission line. In a mobile phone system having a mobile phone connected to a station, if a call is requested from the mobile phone, if all channels of the own radio base station are used, a radio base having an unused channel Requesting means for requesting the exchange to notify the location information of the station, and display means for displaying the location information of the radio base station notified from the exchange are provided in the plurality of radio base stations, First storage means for storing, for each radio base station, whether or not a channel is used, and second storage means for storing position information of the radio base station for each of the plurality of radio base stations. , When the wireless base station is requested to notify the position information of the wireless base station having the unused channel, the searching means for searching the position information of the wireless base station having the unused channel, A mobile phone system comprising: a notification unit that notifies the requesting wireless base station of the position information of the wireless base station. 4. The mobile phone system according to claim 1, 2 or 3, wherein the second storage means of the exchange is arranged for each of the plurality of radio base stations in the order of short distance from the radio base station. Storing the position information of the wireless base station, the search means of the exchange searches for the position information of the wireless base station closest to the requesting wireless base station and having an unused channel. A mobile phone system characterized by: 5. A radio base station using an exchange, a plurality of radio base stations installed in each area, which are connected to the exchange via a transmission line, and a part of a plurality of channels on the radio transmission line. In a mobile phone system having a mobile phone connected to a station, for each of the plurality of radio base stations, a first storage unit that stores whether or not a channel is used, and for each of the plurality of radio base stations, Second storage means for storing position information of the wireless base station, and search means for searching for position information of the wireless base station having an unused channel when all channels of the wireless base station are used A location means for notifying the location information of the retrieved wireless base station to the wireless base station that has used all the channels, and storing the location information of the wireless base station notified from the exchange. The plurality of wireless base stations are provided with a storage means for storing the information and a notification means for notifying the stored mobile base station of the location information of the stored wireless base station to the mobile phone of the transmission request source when the mobile phone requests the transmission. A mobile phone system, wherein display means for displaying position information of the radio base station notified from the radio base station is provided in the mobile phone. 6. The mobile phone system according to claim 5, wherein display means for displaying position information of the wireless base stations notified from the exchange is provided in the plurality of wireless base stations. Telephone system. 7. A radio base station using an exchange, a plurality of radio base stations connected to the exchange via a transmission line and installed in each area, and a part of a plurality of channels on the radio transmission line. In a mobile phone system having a mobile phone connected to a station, for each of the plurality of radio base stations, a first storage unit that stores whether or not a channel is used, and for each of the plurality of radio base stations, Second storage means for storing position information of the wireless base station, and search means for searching for position information of the wireless base station having an unused channel when all channels of the wireless base station are used And a notification unit that notifies the searched wireless base station of the positional information to the wireless base stations that have used all the channels, and displays the positional information of the wireless base station notified from the switched device. Mobile telephone system, characterized in that the notifying means provided in the plurality of radio base stations that. 8. The mobile phone system according to claim 5, 6 or 7, wherein the second storage means of the exchange has, for each of the plurality of radio base stations, in order of a short distance from the radio base station. Storing the location information of the wireless base station, the search means of the exchange has an unused channel, and the wireless base station closest to the wireless base station all the channels are used. A mobile phone system characterized by searching location information. 9. The mobile phone system according to claim 1, 2, 3, 4, 5, 6, 7 or 8, wherein the number of unused channels is stored for each of the plurality of radio base stations. The storage means is provided in the exchange, the search means of the exchange searches the number of unused channels of the radio base station together with the position information of the radio base station, and the notification means of the exchange is searched. A mobile phone system characterized by notifying the position information of the wireless base station and the number of unused channels.