DE10119492A1 - Digital cordless communication network mobility having handset entering second base area detected/requesting registration with location sent and server requesting position confirmation/base state re initialisation request. - Google Patents

Abstract

The handset mobility processing system has a central server (1) a mobility server and base units (2,3) with handsets (6). Each handset can be attached to either base following a master/slave protocol. A handset is detected and request registration on a base, request notification is sent back. The central server request position confirmation, and sends requests to the second base unit for re initialisation.

Description

The invention relates to a method for managing the Mobility of a telephone that is cordless Telecommunications network listened. It concerns a telecommunications network, which is a DECT (Digital European Cordless Telecommunication) uses which type Internet used to switch between different elements of the To transport network voice information.

In this particular context, the Erfin makes it possible a user with his or her telephone set make change by all the services that offered to a user who does not move away, remain available. Thanks to the invention, a user can a telephone in particular from one through one first base unit of the cordless telecommunications system change covered zone to another zone from abge a second base unit of this telecommunications system is covered, the properties of the network concerned and good conversation quality is maintained.

The internet connections are means of communication that are used more and more often. An internet connection allows two units to exchange data ahead set these two units have an address that through a communication protocol that the communica organized, interpreted on this connection can be. Such addresses become IP addresses (Internet Protocol). To the transfer of data that is refer to the language on an internet connection too guarantee and order various services too offer that are associated with the transport of language various communication protocols have been set up.  

One of the first protocols to be developed was that Protocol H323, which in particular made it possible to change order conversion problem between a phone number that by a unit at one end of an internet connection is selected, and an IP address of the unit specified should be chosen to solve. For example, sends at this type of protocol, a transmission terminal which is equipped with a wants to communicate with another receiving terminal, from which it only knows a phone number to a central server of the network to which the terminals belong, one Request for communication, accompanied by the phone number. The central server now interprets the Telephone number using a database to get the IP address of the receiving terminal to determine which this telephone number always corresponds. The central server is now able to Contact the receiving terminal, and the two terminal Facilities can now contact Exchange data. This type of protocol corresponds to one Approximation of the protocols used in the digital network Service Integration (RNIS) used to them to be able to adapt to the Internet connections.

As a result, further protocols were developed. in particular especially the protocols MGCP and MEGACO (Media Gateway Control Protocol or MEdia GAteway COntrol in English) were developed to represent the display logs Data transfers related to language Perform internet connections. The essential Differences between the MGCP protocol and the protocol MEGACO consist in the syntax of the requests.

With the MGCP protocol, the central server is called called medium (Call Agent), and the customer facilities are called access points (gateway or media gateway); with the MEGACO protocol, the central server becomes media handle point controller (Media Gateway Controller) called and customer facilities become media access points  (Media Gateway) called. An access point with this Network type denotes either a telephone set assigned terminal or a connection between the Internet network and another telephone network, as with for example a GSM network, a DECT network or the like conventional telephone dialing network, which is either digital or is analog.

These protocols are designed as so-called master / followers leads: this means that the customer terminals Be received from a central server, in particular about the list of events to watch out for informed. If one of the terminals is one of these When events are recorded, it transmits a notification message the server to let him know that they have this event has observed. Communication between customers directions of the network and the central server of the network is done by exchanging binary data applications sent.

The list of events to be observed can vary from event pick-up detection of a telephone set, Entry of the number input on a telephone, Gathering choosing a regular expression to determine when a phone number is complete, gebil det: the server can pretend to the customer that a Number is considered complete if, for example as 4 digits or if they start with 00. , , starts. Every intelligence of such a communication network that is managed by this type of logs concentrated in the server. The server sends to the customer all the messages required to establish a connection put. For example, to make a call about a dozen messages from the server to the customer be sent. The customer facility is limited on reporting messages to the central server send, which include the observation of certain events.  

The interest of such a system is that, in order Offer additional services, only the server can be changed got to. The terminal is a passive element of the network. Around to enrich the communication system, it is enough that Increase capacity or service within diversify the server.

The access points addressed according to these protocols can be of two types: first, the so-called named Resident Access Points Find. They are made up of a terminal that even tuell has multiple communication lines, whereby each of these lines ends with a single subscriber. The protocols define the concept of the end point (end Point); an end point corresponds to a communication channel, connected to the access point. So owns one Access point that has four lines, four end Points. In this case, starting from the IP address four access points are accessed by the access point. The address format that enables this end to access points, the IP address of the Access point and the name of the end point can. When an endpoint is addressed, it becomes inevitable Lich reached a user who is still on the same access point.

There are also so-called non-resident access points (Trunking gateway). In this case, an end point is one Management of the network to the outside. So there must be a phone number specified on the line must really to reach the interlocutor.

The subject of the patent has a telecommunications framework network, which includes lines on which the respective Data exchange through the protocols MGCP or MEGACO ver is governed. The data transfers related to the Voice on Internet connections are also possible.  

The invention essentially deals with the case where the endpoints of a DECT system telephone are. The access points are now from base units or DECT base units formed that are connected to a company network or Data network are connected.

However, the display protocols that allow Sprachsi gnale on Internet connections, such as the MGCP protocols and MEGACO protocol just described len, to transport, do not provide a procedure to the Mobility of the telephones within the network too manage. So if the cordless telecommunications network of the type DECT is used in which the data server is sent to different Base units connected through internet connections and in which the protocols MGCP and MEGACO are used be, and if a telephone set from a first geo graphic zone which is abge from a first base unit is moving to a second geographic zone, the is covered by a second base unit, the Users of the telephone set on the network no longer come cate. This limits interest and capacity of such a network.

The method according to the invention makes it possible to do just that to solve the stated problem. For this purpose, the Invention to extend existing protocols to have the means to deal with applications between the data server and various base units of the network circulate, the mobility of the telephones to manage the network. The extension of the protocols allows a stage of registration of the phone devices in the communication systems, a stage of Question about the location of this telephone, one Stage of localization and initialization of this telephoto to redefine the telephone set. Furthermore based on Invention according to the requests made between the different elements of the telecommunications network and which enable the  To manage mobility of the telephones, on instructions gene already in these communication protocols are defined and used. The invention defi thus a new set of events for the Management of the mobility of the telephone sets, in particular by especially the direction of an instruction that is already in the relevant protocols are present to another Flag event, is redirected and changed.

The invention thus relates to a method for managing the mobility of a telephone set which belongs to a cordless telecommunications network, this network using in particular a central server, a mobility server and a entirety of base units to which one or more telephone sets are connected, each telephone set being connected by one Connection to a first base unit can change to a connection to a second base unit, the central server and the base units communicating according to a protocol of the master / follower type in order to carry out the data transmissions in connection with the voice on internet connections, characterized in that that it includes the following stages, which are:

• - an application for registration on the first base unit to record a telephone set;
• - a request for notification of registration from the first base unit to that to the central server transmit closed mobility server;
• - update a database of the mobility server, by providing identification information in the database, which specifies the telephone that will register the application and a location information that the second database indicates to be connected;  
• - an application for a request on the second base unit the location of the telephone set on this second Base to capture;
• - an application to transfer the secret key between between the mobility server and the second base unit with regard to authentication of the telephone set to send advice;
• - an application to confirm the localization of the second base unit to the mobility server gene;
• - one from the mobility server to the central server Transfer request stating that the telephone an application for confirmation of localization within of the telecommunications network;
• - From the central server to the second base unit Transfer all requests for reinitialization gene.

In addition, the application to provide the localization is sent in the form of an application for reinitialization. The method according to the invention can be used as desired using the MGCP or the MEGACO protocol. The method according to the invention also proposes the use of a digital secret key, which is associated with each identification information contained in the database of the mobility server. This digital secret key is used in particular in the authentication phase of the telephone set. The various requests between the base units, the central server and the mobility server are transmitted through Internet connections. In addition, the applications used, which occur when using the method according to the invention, have a special syntax which, however, uses control commands which are already used in the MGCP and MEGACO protocols and which do not necessarily control the communications the use of the inventive method are specific. In certain embodiments, the mobility server 7 and the central server 1 can be replaced by a single server that fulfills all functions.

The invention and its various uses by studying the description below and the easier understandable figures. These only work indicative character and are in no way for the invention restrictive. The figures show:

Figure 1 is a block diagram, which represents in a simplified manner a situation in which the mobility of a telephone set is to be managed;

Fig. 2 is a detailed representation of the various events that occur to manage the mobility of a telephone set within the telecommunications network, each event being associated with a request that is transmitted from or to the mobility server, a database or the central server.

In Fig. 1 allows a central server 1, in particular to manage a wireless telecommunication network of the type DECT, employing in particular a first base unit 2 and a second base unit 3. The first base unit 2 has a spatially limited covering zone 4 . The second base unit 3 has a cover zone 5 , which is also spatially limited. In general, the coverage zones of such systems are defined such that their coverage is minimal and the total area covered is maximum. A mobility server 7 is connected to the various base units 2 and 3 on the one hand and to the central server 1 on the other. The connections between the mobility server, the central server and the various base units ensure data exchange that is controlled by the MGCP or the MEGACO protocol. These connections can be internet connections.

A mobile telephone set 6 belongs to a user of the telecommunications network. The telephone set 6 communicates with the base units 2 and 3 according to a protocol defined in the DECT system. The user accompanied by his telephone set 6 is able to change from the first cover zone 4 to the second cover zone 5 . Without using the method according to the invention, it could no longer be connected via the telecommunications network to which the base units 2 and 3 belong, since the management of mobility was originally not provided for in the MGCP and MEGACO protocols.

According to the invention, the mobility server 7 further comprises a database 8 , which contains several fields. A first field A of the database 8 can contain identification information which makes it possible to designate a single telephone set among the total number of telephone sets in the remote reporting network. The identification information contained in field A is associated with so-called authentication information in field B, which is available in the form of a digital secret key, which is specific to the telephone set which is defined on the same line of database 8 . A location information that is associated with the authentication information and the identification information of a telephone set is stored in a field C. The location information makes it possible to determine the last base unit at which the telephone set in question was registered.

The database 8 of the mobility server 7 may possibly contain other information: it can in particular inform the telecommunications network by indicating to it whether a given telephone set is able to be connected using another telecommunications network, for example of the GSM type. In the case of a two-mode telephone set, ie which is able to be connected, for example, via a DECT system or a GSM network, the central server 1 can first try to set up a telephone set via the last base unit of the DECT network, which the Telephone set is assigned to connect. In the event of a failure, the central server can send information to the interlocutor who wants to contact the telephone, indicating that this telephone can be connected by the GSM network.

In Fig. 2, the various requests that circulate between the central server 1 , the mobility server 7 and the Basisein units 2 and 3 are shown. Time axes 20 , 21 and 22 are assigned to the central server 1 , the mobility server 7 and the base units 2 and 3 , respectively. These timelines make it possible, in chronological order, to present the various requests sent or received by the various elements of the telecommunications network, each request corresponding to a stage in the method according to the invention. The requests are symbolically represented by horizontal arrows that go from a first time axis to a second time axis.

In order to manage the mobility of the telephones in a telecommunications network using a DECT system, the management of the mobile telephones must be centralized. In the invention, this centralization takes place within the mobility server 7 . In certain versions, however, it is possible that the mobility server is integrated in the central server 1 . Among the various events to be observed there is, in particular, a stage in the registration of the telephone set: if a telephone set is added to the telecommunications network, its description must be sent to the server responsible for mobility. This can be done either by directly configuring the mobility server 7 via a configuration interface of this server or by means of a message which is sent to the server by an access point. Now there is a stage in the authentication of the telephone set: Before a telephone set is approved for communication on the network, its identity must be checked. Then there is the step of locating the telephones: it must be known at all times where the telephones are located, ie which access point must be used in order to enter into a dialogue with this telephone.

Two main phases are shown in FIG. 2: a phase of registration 23 of a telephone set, a phase of localization 24 of the telephone set and a phase of initialization 25 of the telephone set.

The phase of registration 23 of a telephone set comprises a first event 230 , which consists in registering the telephone set in the form of a reference 231 and a secret key 232 within the first base unit 2. For this purpose, the first base unit 2 is in a state of registration brought the recording of a new telephone set, for example, by pressing a button on the base unit 2 or by sending an administration message from the central server 1 . Then the telephone set to be registered must be searched for a point of access. The telephone set then logs on to a detected access point, which is formed by the first base unit 2 , which now records an application for registration of the telephone set. An application 233 is now sent from the base unit on which the registration took place to the mobility server 7 .

This application notifies the mobility server 7 of the registration of a new telephone set; in particular, it comprises two parameters which represent identification information of the registered telephone set accompanied by its digital secret key and the number of the base with which it was registered. This request is called registration notification.

The database 8 of the mobility server 7 must now be updated in a second event 234 of the registration phase 23 . The various fields A, B and C are informed for this purpose. A request 235 that confirms the update of the database 8 is now sent from the mobility server 7 to the base unit 2 .

If the user of the telephone set 6 changes the location and, for example, passes from the first cover zone 4 to the second cover zone 5 , the telephone set 6 again searches for a location on an access point of the network, ie he tries to use an access point to himself to connect to the telecommunications network, which makes it possible to exchange voice signals over Internet connections. The various events that occur are shown in the localization phase 24 of FIG. 2. In this phase, an application 240 is sent from the second base unit 3 to the mobility server 7 . According to a study of the database 8 , the mobility server 7 detects that the telephone set has already been registered at another base. As a result, the application 240 is now interpreted by the mobility server as an application to search for a location.

An identification stage is initiated before the location of the telephone set is assumed on a new base unit. For this purpose, an application 241 , called a key transmission application, enables the mobility server 7 to transmit to the second base unit the secret key that corresponds to the telephone set that sent the application to search for a location. A data exchange 242 is now made between the second base unit 3 and the telephone set. This data exchange corresponds to the DECT protocol and enables the telephone set to be identified precisely. The authentication mechanism used for this data exchange is as follows: the second base unit transmits a random number to the telephone set; the latter encrypts the random number using its secret key and sends the result of the encryption process to the second base unit. The second base unit in turn also encrypted the random number using the secret key that the mobility server sent to it by requesting the key 241 to be transmitted. The comparison between the results of the two encryption methods makes it possible to judge the authenticity of the telephone set.

If the authentication stage has turned out to be satisfactory, an application 243 is sent from the second base unit 3 to the mobility server 7 . This request informs the mobility server 7 that the telephone set has just been located at this base unit. The mobility server 7 can now update the database 8 in order to save the new position of the telephone set. Request 243 is thus a request for confirmation of the localization. For this purpose, the method according to the invention uses a report of the protocol which differs from its usual use. In the case of the MGCP protocol, for example, the request uses the reserved command RSIP (ReStart in Progress). This command is typically used by this protocol to indicate that a telephone set is making a request for reinitialization on the telecommunications network, for example after a previous shutdown. The request for confirmation of the localization 243 is therefore sent in the form of a request for reinitialization. A request 244 , which is sent from the mobility server 7 to the central server 1 , enables the latter to be informed that the telephone set has sent a request for confirmation of the location. Again, the command used in the MGCP protocol is the RSIP command. A request 245 , which is sent from the central server 1 to the mobility server 7 , and then a request 246 , which is sent from the mobility server 7 to the second base unit 3 , now make it possible to acknowledge the request for confirmation of the location as registered ,

The phase of initialization 25 of the access point, which is formed by the second base unit 3 , by the central server 1 can now begin. For this purpose, an application 250 comprising a set of commands suitable for reinitializing the telephone set is transmitted from the central server 1 to the mobility server 7 , then an application 251 , which is similar to the previous one, is transmitted from the mobility server 7 transmitted to the second base unit 3 . Quittieranträge 252 and 253 of the second base unit 3 and the Mobili tätsserver 7 are sent to the mobility server 7 or the Zentralser ver 1, will now be dispatched to the procedural ren reinitialization to approve.

In the MGCP protocol, the syntax of certain requests follows the following rules:

• - after the registration event 230, the request for notification of the registration comprises the command:
  "o: dect / register (secret key)".
• the request to search for a localization 240 includes the command:
  "o: dect / loc_rq".
• in response to the search for localization, the request to transfer key 241 includes the command:
  "X + UAK: (secret key)".
• - Under the commands of requests 250 and 251 , the command "RQNT" (for ReQuest NoTify) can be found.

The method according to the invention can then always automatically be used when a telephone set from a first Cover zone changed to a second cover zone.

Claims (6)

1. Method for managing the mobility of a telephone apparatus ( 6 ) which belongs to a cordless telecommunications network, this network using in particular a central server ( 1 ), a mobility server ( 7 ) and a total of base units ( 2 ; 3 ), to which one or more telephone sets are connected, each telephone set being able to transition from a connection to a first base unit ( 2 ) to a connection to a second base unit ( 3 ), the central server ( 1 ) and the base units ( 2 ; 3 ) Communicate according to a master / follower protocol in order to carry out voice data transmissions on Internet connections, characterized in that it comprises the following stages, which consist of:
to register ( 230 ) an application for registration of a telephone set on the first base unit ( 2 );
to transmit a request for notification of the registration ( 233 ) from the first base unit ( 2 ) to the mobility server ( 7 ) connected to the central server ( 1 );
to update ( 234 ) a database ( 8 ) of the mobility server ( 7 ) by adding in the database ( 8 ) identification information (A) which indicates the telephone set which sent the registration request, and location information (C) which the second database ( 3 ) indicates to be connected;
to register on the second base unit ( 3 ) an application for requesting the location ( 240 ) of the telephone set on this second base ( 3 );
to send a request to transmit the secret key ( 241 ) between the mobility server ( 7 ) and the second base unit ( 3 ) with a view to authentication ( 242 ) of the telephone set;
transmit a request for confirmation of the location ( 243 ) from the second base unit ( 3 ) to the mobility server ( 7 );
transmit from the mobility server ( 7 ) to the central server ( 1 ) an application ( 244 ) indicating that the telephone set has sent an application for confirmation of the localization within the telecommunications network;
to transmit a set of requests ( 250 ; 251 ) for reinitialization from the central server to the second base unit. 2. A method for managing the mobility of a telephone apparatus which is a cordless telecommunications network according to claim 1, characterized in that the application for confirmation of the localization ( 243 ) is sent in the form of an application for reinitialization. 3. Procedure for managing the mobility of a phone apparatus that is connected to a cordless telecommunications network hears, according to one of the preceding claims characterized in that the communication protocol between between the central server, the mobility server and the different base units is the MGCP protocol. 4. Procedure for managing the mobility of a phone apparatus that is connected to a cordless telecommunications network hears, according to claim 1 or claim 2, characterized characterized in that the communication protocol between  the central server, the mobility server and the different base units is the MEGACO protocol. 5. A method for managing the mobility of a telephone apparatus that is listening to a cordless telecommunications network, according to one of the preceding claims, characterized in that the authentication of the telephone apparatus is carried out in particular with the aid of a digital Ge secret key (B) which provides the identification information in the database ( 8 ) of the mobility server ( 7 ) is allocated. 6. Procedure for managing the mobility of a phone apparatus that is connected to a cordless telecommunications network hears, according to one of the preceding claims characterized in that the different requests between the base units, the central server and the mobili tatserver transmitted through internet connections who the.