FI102125B - Wireless terminal location management - Google Patents

Description

102115

Wireless terminal location management

The invention relates to supporting the mobility of wireless terminals, such as DECT telephones, in a telephone network.

Referring to Figure 1, wireless terminals such as DECT telephones as described in ETSI Standard 300 175 Radio Equipment and System: Digital Cordless European Telephone, Common Interface, Parts 1-9 may be connected to the Public Integrated 5 Services Network (PISN). The DECT system comprises a base station FP (Fixed Part), which is usually connected to the public switched telephone network 10 PISN via a PBX (Private Branch Exchange). There are three main types of base stations FP: a home base station or a base station to be attached to an office switchboard, and the so-called telepoint base stations. In a conventional wired telephone network, e.g. signaling protocols DPNSS and DSS.1, described in CCITT (now ITU) Recommendation: "DSS.1, Q.930-Q.940, 1989, Digital Subscriber Signaling System No.1, Network 15 Layer, User-Network Management ". These signaling practices support subscriber mobility very poorly or not at all.

In order to support the mobility of the subscriber, the services of the exchange network can be supplemented with the intelligent network technology IN (Intelligent Network), which is defined e.g.

In the ITU Q.1200 Series Recommendations. Smart grid technology can be used to connect 20 different types of telecommunication networks, such as the public switched telephone network PISN and the cellular network.

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"terrestrial mobile communication systems, for example GSM and NMT, not shown in Figure 1" are shown separately. The principle of intelligent network technology is that the signaling required to establish a voice connection takes place under the control of an intelligent network, but the actual voice connection is connected by known functions of the telecommunication network in question.

One service provided by the intelligent network is call forwarding FMD (Follow Me • y. Destination). With this service, the subscriber can direct incoming calls to the desired number, which can be, for example, a PBX extension number or a mobile network number. For example, in Figure 1, a user of a terminal TE1 (Terminal Equipment) switching from a first DECT system DECT1 to a second system DECT2 can order a call transfer to an extension number of this second system.

The problem with the solution described above is, above all, that the call transfer requires activity and care from the subscriber. In prior art solutions, the subscriber must know the number of the extension to which the calls are to be forwarded and remember to communicate this information to the operator.

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The object of the invention is thus to develop a method and an apparatus implementing the method in such a way that the above-mentioned problems related to subscriber mobility and location management can be solved. The objects of the invention are achieved by a method and a system which are characterized by what is stated in the independent claims. Preferred embodiments of the invention appear from the dependent claims.

The invention is based on the fact that the location information of the subscriber is maintained by means of intelligent network technology. The signaling between the telephone exchange and the exchange is supplemented by additional information, which includes information on the location of the subscriber's terminal.

The method and system according to the invention have the advantage of better supporting the mobility of the subscriber. The subscriber does not have to specify the extension number to which he wants to transfer his call. It is sufficient for the subscriber to switch on his telephone in the area of the new exchange. The invention does not require modifications to existing terminals. The invention can also be applied in connection with dual-function terminals, for example GSM / DECT telephones, whereby the invention saves radio resources, since as much of the signaling as possible takes place via a wired telephone network.

. ·. . The invention will now be described in more detail with reference to preferred embodiments. . * 20, with reference to the accompanying drawings, in which:

Figure 1 shows the essential parts of a known telecommunication system according to the invention; ·· · ’

Figures 2A and 2B show a location update according to the invention: in a DECT system; and v * 25 Figure 3A shows signaling in connection with an incoming call to a terminal; and: A: Figure 3B shows signaling in connection with an intercom internal call.

• · ··· • · · • · ·. ·. With further reference to Figure 1, in accordance with the invention, it is proposed that the functionality of the PBX of the 30 · PBX be supplemented in a manner which is to some extent analogous to the home and / or guest register of mobile communication systems.

you. Each wireless subscriber is assigned an HPBX home exchange

«(Home PBX). For the purposes of this application, a switch other than a home switch is referred to as a foreign exchange VPBX (Visited PBX). Each gear 35 has both HPBX and VPBX functionality. For the purposes of this application, an Exchange Exchange EXC (Exchange) is any exchange through which PBXs are connected to the public switched telephone network PISN and / or mobile telephone networks.

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The EXC is required 1) to have an interface for PBX exchanges for voice communication, 2) to support an interface to a Service Switching Point (SSP) for a signaling connection, and 3) to support INAP exten-5 sions for this purpose. ).

According to the invention, a roaming number ROAM # (Roaming Number) is assigned to a subscriber who moves to the VPBX area of a foreign exchange. For roaming numbers, a fixed area of the number space of the gear in question can be reserved in the numbering plan. This avoids consuming public telephone-10 network numbers.

The functionality supporting the subscriber's mobility can be implemented, for example, by a suitable addition to the conventional call set-up practice between the PBX and the exchange EXC. The messages used in call set-up may include an Extra Information Packet E1. The E1-15 packet can be encoded in different ways in different signaling protocols. In the case of the exemplary DSS.1 policy, suitable data elements are e.g. FACILITY and USER_TO_USER. You can also define your own specific field for this purpose. The supplementary information package E1 is transparent to the EXC. (the center does not respond). The purpose of the E1 packet is to support the subscriber's mobility so that information about the subscriber's location can be transmitted via the intelligent network switching point SSP to the intelligent network service control point SCP (Service Control Point). The service control point SCP, in turn, maintains data in a database • S · (Service Data Point). The additional information package can be used to transfer e.g.

‘• i .: information related to subscriber identification, ie authentication.

25 The logical connection between the PBX of the exchange and the intelligent network - in particular its service control point SCP - comprises two functions according to the invention: Y functionality: location update and location cancellation.

: * · *: Foreign gear in connection with Location Update (LU). The VPBX informs the SCP of the intelligent network that the terminal TE tries to register in the area of the new * * ** **. *.:.: 30 switch. When the SCP receives this information, it checks the SDP subscriber information from the database, and in particular whether that subscriber has the right to: T: use the VPBX services of the new exchange.

In connection with Location Cancellation (LC) SCP

• ♦ removes from the database SDP the information that the terminal TE is in the area of the foreign exchange 35 VPBX.

Figure 2A shows a possible signaling when the terminal registers in the VPBX area of the foreign exchange. For the sake of illustration, only the steps relevant to the invention are shown. In the context of this application, reference numerals 2A-1, 2B-1, etc. denote the corresponding steps in Figs. 2A, 2B, etc.

In step 2A-1, the terminal TE sends a Location Update Request to the VPBX, which includes the terminal TE or its subscriber ID. First, assume that the ID is, for example, an IPUI (International Portable User Identity). The VPBX switch states that the terminal in question is not registered to this switch and that the home switch HPBX of the terminal is a switch other than the VPBX switch. Therefore, the terminal 10 is assigned a Calling Number Roaming Number (CLG # ROAM #). Roaming numbers are preferably reserved from the PBX number space of the exchange. This avoids consuming public telephone numbers.

In step 2A-2, the PBX sends a call set-up request SETUP to the exchange EXC, which contains the roaming number indicated in step 2A-1 in addition to the called or B-subscriber number li-15 and the above-mentioned additional information packet E1. The E1 packet contains the information that the quality of the task is a location update LU for the terminal / subscriber with the IPUI. The exchange EXC directs the number analysis to the called subscriber number and determines that an intelligent network service request must be executed to update the location of the terminal TE in the intelligent network database.

r. In step 2A-3, the EXC sends a service request (INVOKE ...) • | | jv for the intelligent network service control point SCP. This links the terminal or its subscriber ID, such as the IPUI number and the subscriber number of the terminal.

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such as the TE_MSISDN number, which in step 2A-4 is returned to the exchange in the • «t '25 EXC Connect message. In step 2A-5, the exchange EXC sends to the home exchange HPBX a position cancellation message LC, which may be, for example, a call setup request SETUP supplemented by an additional information packet account E1 according to the invention. At this point, the E-packet contains information that the location of the terminal subscriber: HPBX in the exchange is canceled. In step 2A-6, the HPBX sends an EXC ALERT message to the exchange. In step 2A-7, the exchange EXC sends • t ·; · ’a corresponding ALERT message to the foreign exchange VPBX, which in step 2A-8 v ·’ acknowledges the location update to the terminal TE. In steps 2A-9 and 2A-10, the following are disconnected: ‘··. · Signaling connections.

If the IPEI 35 (International Portable Equipment Identity) is used instead of the subscriber's IPUI, the signaling otherwise works as described above, but the location information of the physical terminal TE is maintained instead of the subscriber. By implementing the location management according to the invention by means of signaling related to call set-up, the existing signaling and the SCP interface can be used without major changes.

If the terminal TE moves from the area of the first foreign exchange to the area of the second foreign exchange, the signaling otherwise takes place as described above, but the location cancellation LC is sent to the foreign exchange VPBX to which the subscriber's IPUI (or terminal IPEI) was last updated.

Figure 2B shows the signaling in case the terminal TE returns to the HPBX area of its home exchange. The signaling corresponds to the steps described in connection with Figure 2A, but during steps 2B-1 to 2B-9, the functions of the HPBX and VPBX of switches 10 are reversed. Steps 2A-n and 2B-n may be collectively referred to as 2x-n. The location of the terminal TE is updated from the foreign exchange VPBX to the home exchange HPBX.

Referring to Figure 3A, it is assumed that a call arrives at the terminal TE when the terminal is in the VPBX area of the foreign exchange. The signaling for an incoming pu-15 call is as follows. In step 3A-1, the exchange EXC receives a call from another, not shown exchange EXC2, which may be the PISN exchange of the public telephone network or equally well the exchange of the mobile telephone network. In step 3A-2, the exchange EXC sends a service request (INVOKE ...) to the intelligent network SCP, which: 'v contains the TE_MSISDN number of the terminal. In step 3A-3, the SCP returns to the 20 exchanges the roaming number CLD # ROAM # assigned to the EXC terminal. Vai-: ·. In Figures 3A-4, the exchange EXC concludes from the roaming number that the terminal TE is in the area of the VPBX of the exchange and sends a call set-up request to that exchange. Steps 3A-5 to 3A-10 correspond to conventional speech formation. In step 3A-5, the terminal TE corresponding to the search is retrieved

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v 25 in step 3A-6, etc. In step 3A-10, the EXC sends an Access_Complete message to another EXC2.

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.v Figure 3B shows the signaling of the DECT system switch HPBX

• · · v; during an internal call. Assume that subscriber A is TE1 and subscriber B is:. respectively TE2. Signaling is the same as for a normal DECT- · · *. * 30 call. A service request to the SCP of the intelligent network is not required because, in step 3B-2, the HPBX home exchange determines that the B-subscriber is in the beginning of the same exchange. and may initiate a search according to the state of the art. If the B-subscriber were in the area of the VPBX of the foreign exchange, the signaling would take place in the same way as in connection with Fig. 3A, but instead of the exchange EXC2, the call is initiated from the A-subscriber's terminal TE1.

The physical implementation of the invention requires that the location update and call set-up messages according to the prior art be supplemented with additional information elements according to the invention 102125 6. This is most easily accomplished through software changes. More specifically, the arrangement according to the invention comprises the following modifications: the PBX comprises means for assigning location information to the terminal TE of the wireless network; the PBX comprises means for associating the location information and the identifier (IPUI / IPEI) of the terminal TE with the call set-up message SETUP; the exchange EXC comprises means for sending the location information and the identifier of the terminal TE to the node SCP of the intelligent network in connection with the service request INVOKE; the intelligent network node SCP comprises means for associating the location information and the identifier of the terminal TE with the ISDN number of the terminal TE.

The invention has been described by way of example in connection with a DECT system and assuming that DSS.1-15 signaling is used between switches and exchanges. From the above description, it will be easy for a person skilled in the art to apply the invention to other cordless telephone systems. It is also clear that in addition to the telephone, the invention is equally suitable for location management of all types of mobile terminals. The invention and its embodiment; dot are thus not limited to the examples described above but may vary within the scope of the ‘20 claims.

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Claims (11)

A method of position updating a wireless data terminal (TE) in a telecommunication system comprising a plurality of switches (HPBX, VPBX) and at least one telephone exchange (EXC), and which telecommunication system starts in connection with the public telephone network (PISN) and the intelligent network; in which method the data terminal (TE) sends (2A-1, 2B-1) a position update message to the exchange (PBX) and the exchange (PBX) sends (2A-2, 2B-2) a call establishment message to the exchange (EXC); Characterized in the method further - the switch (PBX) interconnects (2A-2, 2B-2) the position information of the data terminal (TE) and the identifier of the data terminal with the call establishment message; - the exchange (EXC) sends a service request (2A-3, 2B-3) which includes the data terminal (TE) position information and the data terminal identifier to the intelligent network node (SCP); and - the intelligent network node (SCP) interconnects data terminals. position (TE) position information with the relevant data terminal *; subscriber number, advantageously an MSISDN number. 20 The method according to claim 1, characterized by co-occurring bands with an incoming call (3A-1) to the data terminal (TE): - the exchange (EXC) transmits (3A-2) a service request comprising: Ί ': the subscriber number of the data terminal (TE), advantageously an MSISDN number, to the intelligent network node (SCP); • y. - the intelligent network node (SCP) transmits (3A-3) the position information of the data terminal (TE) to the exchange (EXC); • The central (EXC) establishes (3A-4) a connection to the switch (PBX): as the position information of the data terminal (TE) indicates which switch is established. calls to the relevant data terminal (TE). • · · • · · • · ♦ 3. A method according to claim 1 or 2, characterized in that each data terminal (TE) is assigned at least one home exchange (HPBX) which, in connection with a call within the home exchange's area, finds that both the mating and the mating subscriber are within a range belonging to the same switch, in which case the home exchange (HPBX) establishes the call 102125 11 without a service request to the intelligent network. Method according to any of claims 1-3, characterized in that the switch (HPBX, VPBX) reserves a roaming number 5 (CLG # ROAM #), for the data terminal (TE), which number is used as position information for the data terminal (TE ). 5. A method according to claim 4, characterized in that a fixed area is reserved for the roaming numbers (CLG # ROAM #) in the numbering plan in the number space of the relevant exchange (HPBX, VPBX). Method according to any of claims 1-5, characterized in that the data terminal (TE) is a data terminal in a DECT system and that the identifier of the data terminal is IPUI or IPEI. 15 The method according to claim 6, characterized by following the DSS.1 signaling practice and the positioning information being arranged in the FACILITY or USER_TO_USER data element. 8. A telephone network switch (PBX) comprising means for connecting to: the intelligent network's service switching node (SSP) and to the base stations: (DECT-FP) in a telephone system supporting the wireless data terminals (TE); .I, characterized by the switch (PBX) further comprising, - means by which the position information is indicated for the treeless:; Network subscriber (TE); and • <I '· [·' - means by which the position information and the data terminal (TE) v: identifier are sent to the control panel (EXC) in connection with the position update performed by the data terminal (TE). · · · · · · · · · · 9. A telephone network switch (PBX), according to claim 8, characterized in that the position information of the data terminal (TE) is a roaming number: i: more (CLG # ROAM #), which is advantageously reserved in the present case. exchange • number space. <I I • «« • · · 10. Arrangement for position updating of a wireless data terminal (TE) in a telecommunication system, which comprises a number of switches (HPBX, VPBX) and which telecommunication system interferes with the public telephone network (PISN) and the intelligent network; wherein the data terminal (TE) comprises means for transmitting a position update message (LOC_UPD_REQ) to a switch (PBX) in connection with a call setup and the switch (PBX) comprises means for transmitting the call setup message (SETUP) to a switchboard (EXC); characterized further that - the switch (PBX) comprises means by which the position information is indicated for a data terminal (TE) in the wireless network; - the switch (PBX) comprises means for interconnecting the position information of the data terminal 10 (TE) and an identifier with a call setup message (SETUP); - the exchange (EXC) comprises means for transmitting the data terminal (TE) position information and identifiers to the intelligent network node (SCP) in connection with a service request (INVOKE); 15. the intelligent network node (SCP) comprises means for interconnecting the data terminal (TE) location information and identifier with the data terminal (TE) subscriber number, such as an MSISDN number. Arrangement according to claim 10, characterized in that the position information of the data terminal (TE) consists of the roaming number: '·. (CLG # ROAM #) as the switch (PBX) indicates. «« • «« I 14 • «I 4 4 I 4 IIII t 4 4 · M · • · · · · · · · · · · · ff · · u • I 4 (b • · · • «« • • • • · • • · · · · · t · · • · • I 4 4 4 4 4 4 4 1 · · · · 1 • · · · · • I