MOBILE TELEPHONE SYSTEM

Abstract: The object of the invention is a system for transmitting the mobile telephone connection between two or several mobile telephone stations (10-16) in a telecommunication system. When a predetermined group according to the invention makes calls using the group internal number, these calls are recorded, when the caller and/or the receiver is a mobile phone, in the mobile phone exchange in a predetermined way to make it possible to charge these calls differently from the external calls of the group.

Description: MOBILE TELEPHONE SYSTEM The object of the invention is a mobile telephone system as disclosed in the introduction part of claim 1. The linking of different mobile phones to a wire network dependent exchange can be realized in different ways. The EP- A-462727 presents a mobile communication telephone network linked to a PABX-network. The calls of the mobile telephone subscribers linked to the PABX-network are routed via an intelligent base station controller of the mobile telephone network. The mobile phone can be used as the PABX-extension regarding the numbering, when the mobile phone subscriber is within the coverage area of a base station controlled by a certain base station controller. The physical location of the mobile phone subscriber determines whether he can use the above mentioned extension numbering. If the subscriber is outside a defined area, he cannot use the extension number¬ ing. The aim of the invention is to increase the accessibility of the PABX-group subscribers and facilitate the internal calls within the group. The extension numbering functions in mobile calls between the subscribers of the group within the whole coverage area of the network, thus combining the mobility of the mobile phone subscriber and the easiness of the exten¬ sion numbering. Moreover the internal calls within the group can be charged differently from normal calls (e.g. lower charge) . A special application of the invention is the use of wireless connections in a corporation or at a plant area, when most of the calls of the group are made within the coverage area of a certain base station or certain base stations. It would then be beneficial to the user if the call charges in this area are lower than when calling elsewhere. The subscriber's possibility to use the extension numbers in the whole cover- age area of the network should still be maintained. The aim of the invention is to resolve also this problem of wireless connections to improve the accessibility of the subscribers. The system according to the invention provides a decisive im¬ provement of the above mentioned disadvantages. The realiza¬ tion of the system according to the invention is in principle characterized in what is presented in the characterized part of claim 1. The intention of our invention is to enable predetermined mobile phone subscribers to belong to the extension numbering scheme of a PABX and to enable a charging procedure different from the normal for internal calls within the group and for calls from the corporate PABX extensions to the group or from the group to the extensions. The linking of the mobile phone subscribers to a numbering scheme of a certain PABX-group enables the internal calls between the mobile phones associ¬ ated with the PABX-group and especially internal calls with the permanent extensions of the PABX. A certain group of mobil phone subscribers can be defined to utilize the servic¬ es of the network in the whole coverage area of the PABX- group. The use of the internal numbering scheme is made possible within the whole network area. The mobile phone subscriber associated with the PABX-group is connected with the PABX-extensions by dialling the extension number only. A mobile phone associated with the group can be reached at the extension number from the PABX. From the same mobile phone, contact can be taken to the public network in the normal way. The calls to the public network and to the PABX can be charged separately and based on different tar¬ iffs. Calls between the mobile phone subscribers associated with the same PABX-group can be connected either by dialling the normal mobile phone number or the extension number. The charging of the mobile calls can be changed, as the calls are connected as internal PABX-group calls. The charging of the internal PABX-calls can be different from the public network calls as the internal numbering of the PABX is used. In one embodiment of the invention the existing mobile phone network can be utilized in a predetermined specific area. The calls within the area can be charged differently from the normal mobile phone traffic "as internal area calls". The internal calls of a certain area and the external calls of the area can be charged on different grounds. The invention is below described with reference to the en¬ closed drawing. Fig. 1 presents the structure of the subject invention as a diagram. Fig. 2 illustrates the application of fig. 1, when a PABX- group is present and when a local alternative application is used. Fig. 3 presents an alternative application of fig. 1. Below is presented an example according to fig. 1, in which the mobile phone subscriber 10 calls from the area of the mobile phone exchange 23 to another mobile phone subscriber 11 associated with a predetermined group. The dashed line marks the signalling connections between the subscriber data register and the translation table and the mobile phone, in which talk is not transmitted. When the subscriber dials the internal group extension number ABCD, the extension number and the caller's own subscriber number are transmitted in the call set-up message via the base station 9 to the mobile telephone exchange 23, by which the subscriber data register 25 connected hereto checks, based on the data received from the said message, whether the subscriber (the phone) 10 is entitled to use the internal number. If not, the call is not connected. In affirmative case, the mobile telephone exchange 23 transmits the internal number to the number translation table 17 located in the network, where the internal number is translated into the public mobile phone network subscriber number, which is transmitted back to the mobile telephone exchange 23. These translation tables can be located in many different places of the network. The mobile telephone ex¬ change receives from the subscriber data register 25 the information about the table to which the mobile telephone exchange each time transmits the internal number to be trans¬ lated. When the mobile phone exchange has discovered the public network subscriber number of the mobile phone sub¬ scriber 11, the call is routed based on the subscriber number to its destination as a normal mobile call. The mobile tele¬ phone exchange records also in the charging data of the internal call a special mark indicating an internal call for later charging treatment. Fig. 2 gives a general picture of the telecommunication system using mobile telephones, with several mobile telephone stations 10 - 16, the base station 9, which is equipped for connection with the mobile telephones 10 -16 via a radio channel, and which has a restricted circuit subscription area, a so called cell, and which is part of the mobile telecommunication network, in which the mobile phone exchange transmits the connections between the network and other telecommunication networks or the PABX, e.g. to the wire phone 8. The connections between the mobile telephones 10 - 16 are marked with numbers 1-7. All mobile telephones 10 - 16 are associated with a predetermined group, i.e. they are entitled to use the services of the group and their mobile telephone number corresponds to a short number, by which the short number corresponding to the mobile phone number is tabulated in the mobile telephone exchange translation table. The telephones 11 - 13 in the coverage area I of the base stations (marked with the dashed line) can between themselves make calls marked with the arrow marked by 1. In the charging data of the intercommunication between the phones 11-13, the mobile telephone exchange can record in the charging regis¬ ter, based on the information received from the base station, the location of these mobile phones, i.e. the cell code, to separate later on such calls that have been made from within a certain predetermined area, for a different charging treat¬ ment. Also calls via the PABX connected to the mobile tele¬ phone exchange to a certain area (e.g. area I), or calls from the area, can be separated for a later different charging treatment. The calls between the mobile phones 14 and 16, which are marked with number 6, can correspondingly be re¬ corded as internal calls for the area II. When an area I call of the base station 9 is directed outside the area I, but still to a mobile phone associated with the predetermined internal number of the mobile exchange, e.g. 10, 14 or 15, as the connections 3, 4, 5 and 7, the internal number of the group can be used, but the location information, the cell data, of the caller and the receiver recorded in the charging register separates the call to have been made from outside or inside the area. The intercommunication of the mobile phones 14 and 16 within area II can also in the invoicing be treated differently from the intercommunication within the area I, and the calls of area III in an own way differently from the above mentioned two areas. A call from a permanent PABX extension 8 using an internal number to a mobile phone, comes to the mobile phone exchange along a certain route and is treated as described above regarding the call of the mobile phone subscriber associated with the group. The incoming route tells the mobile phone exchange that the caller is entitled to use the internal number, as the mobile phone exchange subscriber data contains information defining the membership of the group. A call at the group internal number from the wire phone 8 or the PABX to the mobile phone 10-16 is respectively transmit¬ ted to the subscriber data register and to the network or to the mobile phone exchange for translation of the internal number to a mobile phone number, whereafter the call is connected. Fig. 3 presents a mobile phone exchange connected to the base stations 9, 24, 26, 31. The calls transmitted via the base stations 9 and 24 between the predetermined mobile phones 10, 11, 12 and 13, can be charged differently from normal calls, because the caller and the receiver of these calls are mem¬ bers of a predetermined group and within a predetermined area, which data in addition to a predetermined subscriber class also is saved by the mobile phone exchange in the charging register of said calls. The mobile phone subscriber 13 can also be associated with a predetermined group, enti¬ tled to use internal numbers, but not the area services. Thus a call between the mobile phones 12 and 13 can be made at the internal number, but though both phones are within the prede¬ termined area, the invoicing does not differ from the invoic¬ ing of an internal call, because the charging data of the call contains the record that one of the callers is not associated with the group of the predetermined local service. The phones associated with a mobile phone group of the prede¬ termined area service are a subset of a mobile phone group using predetermined internal numbers. The PABX with its fixed extensions can always be defined to be associated with the local service group, by which calls from/to the PABX, other¬ wise meeting the provisions that a caller and receiver of a predetermined group are located in a predetermined area, are local calls. The coverage areas of the base stations are marked with dashed lines and buildings inside these are marked with numbers 33, 34 and 35 illustrating e.g. plant site buildings. The calls connected via the base stations 24, 31 are not area calls limited by the dashed lines and there¬ fore not treated differently from other internal numbering calls, because the cell codes saved in the charging register differ from the cell data of the predetermined area. Each mobile phone station located within a certain base station cell and having an active connection, is in contact with the base station by a radio connection. One cell can contain several mobile phone stations having an active con¬ nection and which therefore are connected with the same base station. When making a call with a mobile phone, the base station is in connection with the mobile phone exchange, from where the call is routed to the desired number. According to the inven¬ tion, the group internal number of an incoming call to the mobile phone exchange is translated into the receiver's long number and transmitted via the base station to the receiver. The caller's subscriber data is checked to verify that he is entitled to use the group internal number. Moreover, the mobile phone exchange adds to the charging data of the call, the location data of the caller and the receiver for later checking in the charging procedure whether the call has been made within a certain predetermined area, by which the call is treated differently from the normal charging procedure. The register available to the mobile phone exchange contains information about the subscribers entitled to use the short numbers and/or those when calling a subscriber within a certain area, can be separated as calls to be charged differ¬ ently. In e.g. the NMT-system, the base stations are connected to the mobile phone exchange with permanent connections. The mobile phone exchange knows therefore the route of a prede¬ termined subscriber call, wherefore the area can be defined to a certain base station or certain base stations. In the GSM-system e.g. the base station informs in connection with the call-set-up message its own base station identity, from which the mobile phone exchange identifies the base station area of the call. When the charging data contains information about the making and the receiving of the calls, the calls can later be separated in the charging procedure according to the location of the caller and the receiver at the time of the call. Mobile phone subscribers of a predetermined PABX-group can communicate as PABX-extensions. A mobile phone MS associated with the PABX-group makes the connection with the PABX exten¬ sions by dialling the extension number only. Calls from the PABX to the mobile phone MS associated with the PABX are correspondingly made by using the group internal number like the PABX extension number. The connection from the mobile phone MS to the public network is made from the mobile phone network in the normal way. The calls are routed from the mobile phone MS to the PABX when the subscriber dials the PABX extension number, i.e. the group internal number or the operator's calling number. The mobile phone exchange identifies the mobile phone MS to be associated with the PABX-group based on the data contained in the subscriber data register, translates the internal number into a public network number and routes the call to the PABX. When the mobile phone MS is called from the PABX extension number, i.e. the group internal number by using the mobile phone MS number, belonging to the numbering scheme reserved for the PABX group, or a special identification number or the PABX extension number, the PABX connects the call to the mobile phone exchange route and transmits to the mobile phone exchange the number dialled by the subscriber without the possible identification number. With the translation table selected on basis of the location, the mobile phone exchange can translate the number into the normal mobile phone number of the called mobile phone MS based on the data contained in the table. The intercommunication possibilities between two mobile phones MS associated with the same PABX-group are e.g. a connection also by using the mobile phone number, a call from the mobile phone MS to the public network, e.g. the usual way the area code + the number. The call from the public network to the mobile phone MS can be made either by using the normal mobile phone number or the PABX number. The numbering scheme can e.g. be selected as follows, when the pre-dialled numbers have the following significance: 0 emergency and service numbers starting with 0 11 PABX operator lx (x <> 1) PABX extension numbers 2...8 PABX extension numbers 9 communication to the public network. The PABX-group mobile phones MS are generally given own number series (e.g. total 10- and 100-groups), of which numbers are not given to the permanent extensions. The access numbers of the mobile phones MS can start with e.g. the numbers 2...8, which are treated as internal numbers in the charging procedure. The PABX-group mobile phones MS are numbered so that e.g. the normal extension is given a bilobate business group prefix to indicate that the phone is a mobile phone MS. Thus the sub¬ scriber can have the same number both for the permanent phone and for the mobile phone MS, by which the group internal numbers differ only regarding the business group number The PABX comprises a group of subscribers, who are able to intercommunicate by using certain defined internal numbers, which are independent of the public network numbering. To its function the group is a normal subscriber PABX. The PABX- group consists of a PABX/PABX-network subscription and a number of mobile phone subscribers. The public network sub¬ scribers can be members of the PABX-group. The public network subscriber group can consist of a PABX, a PABX network and separate subscribers. The ordinary subscriber number of the individual subscriber of the group is independent of the other subscribers' numbering. An internal short numbering scheme independent of the telephone network list numbering is defined for the PABX-group. The charging data of internal calls of the PABX-group mobile phones are separated from the other calls and different current tariffs can be defined for them. Metering pulses can be sent to the PABX connected directly to an own route of the mobile phone exchange. The PABX can be connected to the mobile phone exchange being the home MSC of several mobile phones. The digital PABX can be connected to the mobile phone exchange, e.g. with a permanent nx2 Mbit/s-route or e.g. demi-fixed nx64 kbit/s-route via the public phone net PSTN, via which routes the talk can be transmitted in the network. In these cases the interface between the mobile phone ex¬ change and the PABX is regarding the mobile phone exchange the normal phone network interface and regarding the PABX the normal direct-dialling-in route. In the home MSC, the normal data register of the subscriber associated with the PABX-group, contains in addition to the subscriber data the PABX-group table index, which expresses that the subscriber belongs to the PABX-group. The index data gives the right to use the PABX-group internal communication. Each PABX-group has an own PABX-group table or depending on the case also several chained PABX-group tables, which can be grouped so that the permanent subscribers of the PABX or the PABX-network are placed in their own tables and the mobile phones of the PABX-group and others (e.g. public network phones) in their own tables. The tables contain subscriber information by group as well as a list of the group subscrib¬ ers. The subscriber data index indicates the group table/table group. The subscriber lists of the PABX-group contain the internal group short numbers, the subscribers own number and the external call restriction data. The subscriber list of the PABX-group tables contains the subscriber's internal short number and the subscriber's long number as normally dialled and the subscriber's external call restriction data. In the visited MSC, when the PABX-group subscriber is in the visited MSC area, the normal subscriber data as well as the subscriber class and the external area code "associated with the PABX-group" are updated in the subscriber register. The subscriber class, which information defines the group member¬ ship in the subscriber register, contains the information enabling the abbreviated dialling. External calls can also be barred. The subscriber group can be expanded by ordinary public network subscribers by adding the subscriber's number data (internal and subscriber number) into the PABX-group table. With the arrangements of the subject invention the services offered by the PABX can be utilized by the mobile phones. It is also obvious that several mobile phone exchanges and/or PABX- can be linked to the PABX-group. The invention has above been described with reference to only one favorable form of application. The solutions presented above and in the drawings are examples, and are not to be considered as so limited, but all modifications within the scope of the inventive idea defined by the patent claims are naturally applicable.

Claims: CLAIMS 1. A system for transmitting a mobile telephone connection between two or several mobile phone stations or terminal sta¬ tions associated with them or other telephone network in a telecommunication system, having mobile telephone stations (10-16), at least one base station (9, 24, 26, 31), equipped for communication with the mobile phone (10-16) via a radio channel and having a subscription area restriction, at least one mobile telephone exchange (23), which is equipped for mobile telephone services, and which is able to be in inter¬ action with the telephone exchanges or the PABX, a predeter¬ mined group has the possibility to call and receive calls according to the internal extension numbering scheme of the group, c h a r a c t e r i z e d in that mobile phone subscribers (10-16) of a predetermined group can call and receive calls according to the group internal extension numbering scheme in the whole coverage area of the mobile phone network, and the calls made by the predetermined group at the group internal number to a mobile phone subscriber of the group or to another subscriber associated with the group (8, 10-16) in the whole network area are recorded in the mobile telephone exchange (23) in a predetermined way to separate them from the external calls of the group. 2. A system as claimed in claim 1, c h a r a c t e r i z e d in that when calling a mobile phone (10-16) associated with the group, a group code of a predetermined group is searched from the subscriber data register (25) containing the group code, based on the group code and the group internal number, the receiver's internal number is translated into a subscriber number according to the receiver's mobile phone network public numbering scheme, based on the subscriber number the call is routed to a re¬ ceiver (10-16) belonging to a predetermined group. 3. A system as claimed in claim 2, c h a r a c t e r i z e d in that the data defining the membership of a predetermined group, i.e. the subscriber class and/or the location codes of the caller and the receiver and the telephone numbers used by them, are recorded in the charging register of the call for later charging treatment. 4. A system as claimed in the claims 1, 2 or 3, c h a ¬ r a c t e r i z e d in that the calls of a predetermined mobile phone subscriber group (10-16) are made to a predeter¬ mined group of mobile phone subscribers at the group's inter¬ nal number, the internal number is translated in the network to a subscriber number according to the subscriber's mobile phone network public numbering scheme. 5. A system as claimed in one of the claims 1 - 4 above, c h a r a c t e r i z e d in that the location data, cell codes, of the subscribers (10-16) associated with a separate¬ ly predetermined group are recorded in the charging register. 6. A system as claimed in claim 4, c h a r a c t e r i z e d in that to a separately predetermined group is associated a predetermined group of mobile phone subscribers (10-16), who intercommunicate within the coverage area of a predetermined base station (6, 9) or base stations to make the further treatment of them as an own group possible. 7. A system as claimed in any of the claims above, c h a ¬ r a c t e r i z e d in that a PABX or a PABX- group has been linked to the mobile phone exchange (23). 8. A system as claimed in any of the claims above, c h a ¬ r a c t e r i z e d in that the mobile phone home MSC (home register) (23) contains besides the normal subscriber data also the subscriber class, which indicates that the subscrib¬ er is associated with the group and that the translation table contains the group internal dial number corresponding to the subscriber's own number. 9. A system as claimed in any of the claims above, c h a ¬ r a c t e r i z e d in that each of the mobile phone ex- changes (23) of the network has a subscriber data register (25) identifying the extension number used by the group, and the network has a translation table (17) for translating the extension number to the public network number. 10. A system as claimed in any of the claims above, c h a ¬ r a c t e r i z e d in that several mobile telephone ex¬ changes and/or PABX are linked to the group.

Inventors: LEHTO MARKKU, MAKKONEN MATTI, POEKKAE TAPANI, LEHTO, MARKKU, MAKKONEN, MATTI, POEKKAE, TAPANI
Applicants: LEHTO MARKKU, MAKKONEN MATTI, POEKKAE TAPANI, POSTI JA TELELAITOS, POSTI- JA TELELAITOS
Application year: 1993
Main classification: H04Q7
IPC codes: H04B7, H04M15, H04W4