Method and system for wireless communication by at least two switching servers

0001The invention relates to a method and an arrangement, which depending on a residence of a Wireless terminal device to connect to this so that establish the connection automatically one switching computer is contacted, in the wireless communication area the wireless terminal device currently staying, even if a communication user, the connection is a wishes with this wireless terminal device, the connection code of another network computer has been entered.

0002In recent years, cordless devices, such as DECT phones, even in private networks increasingly Widespread. The DECT standard (Digital Enhanced Cordless Telephone) standardized only the air interface between a base station (Radio Fixed Part) and Terminal (portable part). Because of the often limited transmission power cordless terminals, is the range of motion on the transmission and reception area of ​​a respective base station limited. In order to reach these mobile devices to expand, so more base stations are required the wireless communication areas mutually overlap, or at least adjoin one another. to cover very large surface areas for wireless communication, such as those extended premises or represent cities, it is often necessary, to base stations provide different switching computers to a sufficiently large wireless communication area for such to have applications available. The system structure Such communication arrangements and used Communication method must ensure that during the movement a wireless terminal device by the different Cordless communication areas is ensured that the The transition between these areas in the wireless communication in terms of stability of the compound no problems occur. This migration through various wireless communication areas is in technical language also roaming called. In particular, must ensure in such roaming be that a wireless terminal device which is normally a communication code in the form of a telephone number is reachable via a connection to this unit a particular network computer turns on, also reachable is, if it is in wireless communication area the base station of another network computer is, which can be reached via a different phone number. These Problem is in a communication system available on the market Siemens AG of the type HICOM 300 by a solved special assembly in any network computer exists and which ensures through network-wide communication, that a wireless terminal device can roam freely.

0003For the sake of universal applicability of switching computers however, it is desirable to add other functions, as outsource the pure switching functions from the computer and Additional functions for the purposes of a client server concept establish.

0004The object underlying the invention is therefore to provide a method and an arrangement to indicate which the Applicability of universal possible switching computers, which only pure switching functions to perform, with the necessary functions for large-scale roaming from Cordless terminals combined.

0005This object is for the method according to the features of the Claim 1 and for the arrangement according to the features of claim 7 dissolved. Developments of the invention result from the dependent claims.

0006Advantageously, the use of the inventive method Cordless connection information for a wireless terminal device kept in a mobility server and means This wireless connection information to connect to the Wireless terminal device manufactured. In this way it is achieved, that universal switching computer can be used and that the wireless terminal device always those switching computer is reached, in which the wireless communication area it is, even if a communication participant wants to establish the connection to this wireless terminal device, the selected number of another network computer.

0007Advantageously contributes to a further development of the described Method of mobility server setting up the wireless connection by means of the connection information, because in this Way standard interfaces for influencing the switching process be used on the network computer can and the technical implementation effort for implementing remains of the process low.

0008Advantageously, in a further development of the described Process from the wireless terminal device identity information dispensed, which from a base station to a respective Switching computer can be received. In this way it can be ensured that, by simple means Link message can be generated, via which the switching computer, via its communications code this usually wireless terminal device is accessible, learns about which connecting currently connect to the wireless terminal device can be established.

0009Advantageously, in a further development of the described Method using the connection message from a passed Vermittlungsredhner on another network computer was that wireless connection information in the mobility server updated because so technically and constructively simple way that everyone OPENING HOURS accessibility Wireless terminal device ensured regardless of his whereabouts becomes.

0010Advantageously, in a further development of the described Process performance of each wireless terminal device provided in a feature server that the Switching computer depend on activated performance features controls, because in this way standardized interfaces are used to control switching computers can and implementation effort for implementing the representation of features on cordless terminals remains low, at the same time universal switching computer can be used, the only switching functions exercise.

0011Advantageously, in a further development of the described Process before connecting to the wireless terminal device checks whether a feature is enabled, the To connect to this wireless terminal device superfluous making, such as call forwarding to secretary, or the activation of a mailbox, which in the respective home exchange calculator can be performed. That goes the connection request and the communication line that these Connection request a transfer. In this way, the prevents that the network load, unnecessary due to construction Compounds rising and on the other hand a high flexibility regarding the use of different features ensured in the system.

0012Advantageously, in a further development of the described Method, different network computer whose contiguous wireless communication areas, to Group summarized, because in this way the movement of Wireless terminal device within the wireless communication ranges this network computer without any limitation and is ensured by the method that the device at any time is achievable. Advantageously, by this procedure the Establishment of demarcated private and public Wireless communication areas in any allows size.

0013is advantageous to use an arrangement of at least two switching computers, which are connected to each other, a mobility server, the connection information to a Wireless terminal device contains and to a switching computer is connected and a wireless terminal device. This arrangement represents the minimum configuration, with the task the invention is achieved and with which a reachability of the Wireless terminal device via the connection by the mobility server is ensured. This arrangement is attractive, because with technically simple means the problem the invention solves.

0014are advantageous in a development of the described Arrangement means for dispensing and means for receiving a from the Wireless terminal device emitted identity information provided, resulting in additional funds in conjunction with connection information the respective switching computer connect message produce, the other network computers can be passed, and the accessibility of the wireless terminal device ensures. By this arrangement and this Agent is easily the accessibility of the wireless terminal device within different wireless communication areas of different switching computers over a single communication code of a home network computer this wireless terminal device ensured.

0015It is advantageous in a development of the arrangement described a feature server is present, the various Performance with respect to the wireless terminal device provides and the network computer as a function of these Performance controls. In this way, switching computer used, the only switching and switching functions exhibit and simultaneously different Features relating to the cordless terminals and realizable represented, whereby a highly flexible universal Communication device is provided.

0016In the following the invention on the basis of figures and embodiments explained further.<sl><li>Figure 1 shows a first communication system with Feature Server and mobility server on the same network computer,</li><li>Figure 2 shows a second communication system with Feature Server on a network computer and Mobility Server on another network computer,</li><li>Figure 3 shows a communication arrangement with mobility server on a network computer and Feature Server the wireless terminal device,</li><li>Figure 4 shows a communication system with two mobility servers and a feature server,</li><li>Figure 5 shows a communication system with two mobility servers and feature server in the wireless terminal device,</li><li>Figure 6 shows a realization form of arrangement on Feature Server and mobility server on a network computer using conventionally used assemblies.</li></sl>

0017Figure 1 shows a first communication device with switching computers VR1 to VR3, a performance feature server LMS, a mobility server MS, a wireless terminal device PP, base stations BS1 and BS2 to the respective switching computer are connected and the wireless communication areas Z1 and Z2 have, in which a radio link FS is etablierbar. Further, a communication terminal KE shown that the wireless terminal device PP a communication link builds. In this communication terminal may involve both a cordless terminal, as well as act a wired terminal. Between the individual Components of these communication devices are compounds 10 to 40 and CTI1 and CTI2 provided.

0018As mentioned earlier, are possible universal be switching computer usable, the only pure Switching. run or switching functions. In this Case, the wireless terminal device PP at the network computer VR2 be achieved by the network computer VR1 a port extension is performed to the base station BS2. At the Connecting to the wireless terminal device PP happens here following: From the communication terminal KE of a communication code entered for the wireless terminal device PP, which usually an availability of PP over the network computer VR1 and the base station BS1 ensures. The connection request of KE now reaches 30 to the switching computer VR1. There is, for example, above the connecting line 50 the mobility server MS with respect to the wireless connection information questioned by PP. It follows that PP is temporarily out of wireless communication area is VR1, but in wireless communication area of VR2 and the base station BS2 in the wireless communication area Z2 is achievable. The switching computer VR1 builds, controlled by the mobility server MS, the compound VR2 to 40 and 50 to BS2. So there is a Connection of KE, the example via a public Switching computer VR3 the PBXs VR1 and VR2 achieved by the network computer VR1 and the network computer VR2 constructed transparent. Controlled is the Connection through the wireless connection information, which is kept in the mobility server MS. Prefers is the network computer on the Standardized Interface for Computer Telephony Integration (CTI) controlled. Here are the links from the mobility server and the performance feature server designated CTI1 and CTI2. With CTI is it is a generic term for the communication between the computer and the network computer. The most popular Standard for CTI CSTA (Computer Supported Telekommunications Applications). But there are also proprietary solutions, such as ACL (application connectivity link). Prefers are all in a respective communication device existing switching computer on similar interfaces controlled by the respective server. To this Way it is ensured that the transition from a network computer secondly switching computer, or when Presence of multiple servers no compatibility issues occur. Preference is given to the wireless terminal device PP issued identity information and, here via the radio link FS, passed on to the base station BS2. The switching computer VR2 sends this identity information together with its own connection information in the form of a connection message other network computer, here at VR1, which can use this link message to the Wireless connection information in their mobility servers update. This occurs, for example, when the Wireless terminal device PP of a wireless communication area Z1 of the base station BS1 and the network computer VR1 in a wireless communication area Z2 of the base station BS2 and the switching computer VR2 changes. The connection message and the wireless connection information in the mobility server can be compared periodically and if a Discrepancy occurs, the current information in the mobility server registered. The performance feature server LMS, which is connected via the interface CTI2 at VR1, Features for PP are provided. Such features For example, the call forwarding, the Activation of a mailbox, or the display of charging units include. Depending enabled features must be ensured by an appropriate procedure, the example activates a port extension , if call forwarding, or the activation of a Mailbox has been turned on. To this end, the proposed Method features prioritized to check, and only establish such cordless compounds whose Structure does not contradict activated features stands.

0019With the arrangement shown in Figure 1 are compounds extension in the form of a terminal extension, a Rufverlängerung, and an extended connection (port extension, Call Extension, Prolonging Connection) possible. hereby are home services of the switching computer VR 1 on other network computers, such as the network computer VR2 available. Another advantage of this type the arrangement because of the control of the cordless terminals in collaboration with the performance feature server LMS keyboard protocols or stimulus protocols may be employed, which are simple and easy to implement. As Identitäsinformation the wireless terminal device, for example, the IPUI as International Portable User Identity, or its Number used. Occasionally, even more data can be used in a his user profile contains, which for example, be stored in a database on the mobility server can. In this way, a high flexibility with regard to reaches the connection message to be transmitted and the comparison operation between the stored information wireless connection and the connection message flexible and simple. Also in the case that the Wireless terminal device PP not, as shown here in the wireless communication area the base station BS2 of the switching computer VR2 is, but rather in the wireless communication area Z1 of the base station BS1 at the network computer VR1, the structure of the wireless connection with PP by the will Network computer VR1 by the mobility server MS through the wireless connection information controlled.

0020As Figure 2 shows, in contrast to Figure 1, the feature server LMS also at the network computer VR2 via Be the interface CTI2 connected. In this case, is also assumed that the communication subscriber the wireless terminal device via the network computer VR1 can be reached. The wireless connection information is thereby provided by the mobility server MS, which at the network computer VR1 is connected via the interface CTI1 is. In this context it is noted that all reference signs denominated the same, the different figures across assembly components relate to the same function.

0021By means of the wireless connection information is from the mobility server MS is an incoming the network computer VR1 reputation for the wireless terminal device PP goal, the goal here is VR2, extended. Also from the wireless terminal device PP are outgoing calls in this case first to the network computer VR1 over Compounds 47 and 40 extended and then the desired headed goal. Here, the incoming / outgoing calls the switching computer VR in feature or in the Mobility Server connected. For mobility server only For example, signaling messages, such as the destination address transmitted, wherein preferably the CTI-interface to the Applied. Based on this destination address, the mobility server then determine, by a comparison with the stored data if the wireless terminal device located in the Wireless communication area Z1 or in the wireless communication area Z2 is. In both cases, the mobility server causes the network computer to connect to the Wireless terminal device PP build. In contrast to the figure in 1 arrangement shown are the performance the wireless terminal device PP of a performance feature server LMS provided which is connected to the network computer VR2 is.

0022Since performance feature server, which to different Switching computer are connected, in terms of the provided differ and available features can, there is the possibility that, within the Wireless communication area Z1 and within the wireless communication range Z2 different performance be available. This statement, however, applies if at the various network computers, as opposed for display in Figure 2 are each a feature server LMS is connected and the respective performance feature server on the various network computers VR1, VR2 a provide different spectrum of performance features.

0023Figure 3 shows a further arrangement for wireless communication by two switching computers, in which the performance feature server is integrated in the wireless terminal device PP. After the mobility server further at the network computer VR1 is connected, is of this accordingly for incoming Calls from KE, here is one such designated 30, the corresponding switching processor, here VR2, according to the Wireless connection information in the mobility server MS extended. In the arrangement shown here, the information is about features of the wireless terminal device PP an extension connection CTI2 which by the base station BS2 passes toward the wireless terminal device PP transfer. In this case, the wireless terminal device has sufficient have intelligence to convert the information about CTI and in accordance with specific features of the switching computer VR1 to control. Incidentally, that the Link CTI2 only a logical connection represents and not two spark gaps symbolizes how might reveal mistake from the illustration. The connection CTI2 can therefore be included in the spark gap FS.

0024As Figure 4 shows, there are also arrangements which in other Communication networks are used instead of the Extension connections (port extension) the call deflection (Rerouting) support. For this case are two Mobility Server Used, MS and MS2. is In this arrangement, incoming from the communication terminal KE calls bypassing the switching computer VR1 via connecting lines 70 and 75, the wireless connection information from the mobility server MS retrieved and a link directly from the switching computer VR3 connected through bypassing of VR1 to VR2. This compound is referred to in Figure 4 with 35th

0025The network computer VR2 for this case by the mobility server MS2 controlled, which is also the wireless connection information provides. This then forwards the call via 35 to the base station BS2 and via this to the wireless terminal device PP on. Here are the network computer VR2 CTI2 information on the performance of the wireless terminal device passed on to the performance feature server LMS. According to the mobilized and updated features controls LMS the network computer VR2 and thus sets Determine which features the wireless terminal device PP be realized. Because in this case no connection extension done for the network computer VR1, can the Wireless terminal device PP activated from only those features be that provided in the performance feature server LMS are. For this reason, it may be provided that the Wireless terminal device PP displays only those features be who are LMS also activated. In the case, that, as shown here, several mobility servers MS and MS2 are present, can cyclically updates the Cordless connection data / information in the mobility servers be performed. This situation is a Connection UP indicated between MS2 and MS. To update the wireless connection information to the mobility servers can standard protocols MAP (Mobile Application used Protocol) or CTM (Cordless Telephone Mobility) will.

00265 shows analogously to the illustration in Figure 3 the case realized the performance feature server in the wireless terminal device PP is. In the event that the network does not Port extension, but the rerouting supported. When the connection is established and when updating the mobility server the same considerations apply, which were set out in the arrangement in FIG. 4 Only with regard to the on the wireless terminal device PP to Available features is ensured in this case, that the wireless terminal device PP in each wireless communication area each network computer via the same feature range has, since the feature server is integrated in the wireless terminal device and the Features from the wireless terminal device via CTI2 in switching computer VR2 are driven. In this case it is particularly important that all switching computer VR the same support CTI protocol, otherwise the control of performance on the various network computers even works and another time not. As shown here, are for the case of such an arrangement in the entire Power no more feature servers necessary because the wireless terminal device to feature server located leads.

0027As shown in Figure 6, a technical realization of the invention as an example in a conventional Communication system using a standard assembly SLMC be realized. In this particular case, the Mobility features and performance characteristics by a Mobility Server and a feature server via CTI interfaces CTI1 and CTI2 driven to the assembly SLMC. This module accepts then only in accordance with the Wireless connection information in the mobility server MS to Construction of the extension connection to another network computer, shown here is the extension as connection 40 for network computer VR2. As shown here is, the CTI interface via a V24 connection can be implemented, the already standard at the network computer VR is available. To send by Electronic Post and transmitting facsimile messages, can example, a computer PC through data lines 210 to a Data network INT be connected, in turn, through a another line connected 100 to the performance feature server LMS is. From computer can ST also providing are controlled by features on LMS.