Method and apparatus for addressing a wireless communication station with a dynamically-assigned address

AREA OF EXPERTISE THE INVENTION

The The present invention relates generally to the field of communication technology including wireless communication stations; especially the invention relates to the part of that territory, addressing the the wireless communication stations with dynamically allocated As addresses.

BACKGROUND THE INVENTION

progress have in the fields of electronics and communications technology introducing many allows new types of communication systems. Information can affordable be transmitted to locations and in a manner as not previously possible or was not affordable.

the Field of cellular telephony is an example of a communication system, that has been made possible due to such progress. communication as part of a cellular telephone or other wireless telephony system is advantageous, since no fixed, wired connection between a transmitting station and a receiving station required is to transfers between carry them to. A cellular or other wireless telephony communication system is therefore particularly advantageous for the implementation transmissions, when the use of fixed or hard-wired connections to perform transfers would be inconvenient or impractical.

persistent Advances in cellular telephony and other Types of wireless telephony communication technology have the introduction of new services and new forms of communication in the context of already installed cellular and other wireless telephony networks allows.

To the Example are proposals been made to existing cellular and other communications networks with the ability to transfer to provide packet data, such as General Packet mode Radio Service (GPRS). Information between a transmitting and a receiving station is to be sent, is to discrete Data packets formed. Individual ones of the packets can on a communication channel transmitted from the sending station to the receiving station. There the information is transmitted by means of discrete packets, uses the transmitting station the channel only during the time periods, required to send the discrete packets. The channel is therefore usually a shared channel of a variety used by transmitting stations.

by virtue of the multiple use of such a shared channel could be that a Data packet to be transmitted by a transmitting station, must be queued until the used together channel available is. However, because the shared channel is shared, the costs sending the data to a shared channel under be divided many users because the transmitting station no fixed switched communication channel must be assigned to the transmission perform the packet. About the Internet the transfers and transfers under paging networks are also examples for communication systems, data transfer use of packet data.

the mentioned above digital cellular communication network GSM is an example of a cellular Communication system for the introduction of GPRS has been proposed and proposed standards for the released have been. GSM mobile stations constructed in accordance with such a standard are capable of packet data over to transmit the GSM network. A host, such as a notebook computer can send packet data and received, when the host of the mobile station or, for example, PCMCIA wireless modem card is connected accordingly. The host with the mobile station or an analog device is hereinafter referred sometimes collectively referred to as wireless communication station.

Around to forward a data packet to a wireless communication station, it is necessary that the Package with an identification address of the wireless communication station is addressed. An Internet Protocol (IP) A dresse is an example for an identification address, which can be used to address packets to the the communication station to be forwarded. If transmissions be carried out as part of an Internet protocol, of course, is the used IP address. Such similar Addresses are used when data in the context of other protocols, such as the X.25 protocol, should be sent.

Lots different types of services have been implemented which by transferring performed by packet data will.

Communication services For example, the user-user communication between participants Such services allow, can by transferring carried by packet data. ElectronicMail or fax mail are examples for communication services. Such services utilize storage units with sections mailbox operation, sometimes together with the notification processing, such as functions for Issuing, processing and transformation of information.

Certain Query services can also by transferring be performed by packet data. Such services offer the possibility access information that is stored in database centers is. Information that is stored in such database centers, is a subscriber of such services upon request by the Participants received. Query services, within the framework of the World Wide Web (WWW) of the Internet Provided are an example of a query service.

Telecontrol services can also by transferring performed by packet data will. Action at a distance services are normally transactions low volume of data (that is of short duration) in. The validation process of Credit cards, lottery transactions, utility meter readings and transfers of electronic monitoring and supervisory systems are all examples for Action at a distance services.

distribution services can also by transferring performed by packet data will. Such services are a by a unidirectional flow of data Web site in a variety of other locations. News, weather and traffic reports, and product or ServicesWerbung are examples of such distribution services.

Certain Dialog services can also by transferring be performed by packet data. Dialog services provide by means of continuous real-time transmission of information for a bidirectional communication between subscribers of such services. The Telnet^TMApplication of the Internet is a example for such a service.

Certain Allocation services are also examples of two-way services by transferring performed by packet data can be. Such services are through the bi-directional flow of information from a network location (e.g., a dispatcher) and other in users. Taxi and public transport services are examples of such allocation services.

Conference services Still other types of services, by the transmission performed by packet data can be. Such conferencing services provide a multi-directional communication using real-time transmission of information between multiple users.

Although the packet data with the identifier of the wireless communication station must be addressed to which the packet data is to be forwarded, such transfers occur rarely to a specific communication station normally and only during short intervals on. For example, use the aforementioned communication services Usually storage units, the release of information that before transmission storing such information to the wireless communication station. The wireless communication station need not specific to a be time to reach to ensure the communication of information alternately the wireless communication station can be transmitted. Of the Sender of the message information has only the message address, For example, the E-mail address, the wireless communication station know. If they are stored in the storage unit, the wireless communication station at any time capable received News from the storage unit to retrieve.

Query-, Dialogue and action at a distance services are all by the wireless Communication station triggered. For a Such triggering by the wireless communication station, it is only necessary the existence Service provider the identifier address of the wireless communication station knows, which is used when the service is requested. The ID address must therefore not be a permanent identifier, the wireless communication address permanent features.

distribution services are normally an entire broadcast area broadcast and not to specific wireless communication stations addressed. Only the area codes the areas where the information is to be broadcast, have the Sender of the information to be known.

allotment and Conference Services also require only that the service provider who presently the wireless communication station used identifier is known. This means, so that the service provider the disposition or conference station can provide, should the Service providers will be equipped with the address of the communication station. The address must, however, be no permanent address.

As stated above, none of the aforementioned requires services that the wireless identified communication station with a permanent identifier is to ensure that packet data properly are addressed to transmitted to the wireless communication station to become. If, instead, the communication station a temporary assigned identifier can Data of the wireless communication station are to be transmitted, with temporary Identifier are addressed to the wireless communication station. A method by which an IP address can be retrieved when a connection is established on the link layer, is in IETF RFC 1332, the PPP Internet Protocol Control Protocol, described. However, the use of temporary IP-addresses, Dial IP addresses or other temporary identifiers for the identification been a host device so far used mainly to stationary hosts to identify, such as by means of a modem. An implementation of the mentioned above Services, in which a temporary ID is used instead of a permanent identifier to packet data To address that is transmitted to a wireless communication station should be, therefore, is advantageous.

US Patent 5,410,543 describes a method for connecting mobile computers with a computer network. If the mobile computer is in motion, it reports its current actual Address to an address server, the mobile computer with an alternate address on the network represents. The address server takes for mobile computing certain packets and forwards them to current actual Address further the mobile computer.

Various Possibilities, a wireless environment IP transmissions adapt, are in D. Cohen et al .: "IP addressing and routing in a local wireless network " IEEE INFOCOM 92: Conference on Computer Communications, Volume 2, New York (USA), discussed. The article describes wireless networks with mobile units send and receive an IP packet based on the IP addressing can. Each mobile unit also has a local identifier (LID), in the local wireless environment through which they is known, and a permanent and globally unique fixed programmed electronic identification (EID), which mainly for authentication purposes is used. A scheme for temporary IP addresses (TAS) is described. In this scheme, the mobile Unit assigned from a base station, a temporary IP address when it is turned on and it identifies itself to the base station. Each base station has its own bank of IP addresses that you assigned permanently are. As far as IP routing, the addresses are always the base station assigned to which it has issued. If a mobile unit from one base station to another embarks, two alternatives are proposed: Updates the routing table and forwarding by the source base station. The alternative of routing tables update works substantially like a permanent scheme, and updates be over Updates the existing routing tables spread. When forwarding by the source base station are not Routing tables changed, because the source base station always knows the base station that the supplied IP address in question, and packets are accordingly forwarded. A drawback with this approach is how explained in the article is that it resulting in a non-optimal routing of data packets, if it relies on the source base station during the forwarding. In addition, the communication with the mobile unit is interrupted, when the Source base station crashes (a dysfunction Has). In order to enable more efficient re-use of IP addresses is proposed an address consultant to use, between the bank of IP addresses and the assignments the base stations and their assigned IP addresses hosts. The address consultant is consulted every time a base station of a mobile Unit allocates an IP address and when a base station stops a to supply mobile unit (for example due to handover). The address consultant ensures an increasing Reliability, since a base station that crashes, the Address advisor can query and update itself when powered up. However, the need to Base stations still have the overview of the have mobile units to determine whether IP addresses reusable are. The article proposes also a slightly more efficient variant in which, however, a certain additional complexity requires. After the handover is the mobile unit an additional address from the Bank of assigned to new base station. All new transmissions with this additional address set, resulting in improved routing. The old address is stored for as long as even a transfer takes place, which they used.

EP-A1-0 483 547 discloses a network for the use of the Internet Protocol adapted for mobile applications is. The network includes local area networks (LANs), each LAN terminals and mobile communication comprises units wirelessly to the headends communicate. Each includes LAN also a local gateway for coupling the LAN with a global Gateway, which in turn is coupled to remote network users. The global gateway, a plurality of IP addresses allocated, the requesting mobile communication units by the global Gateway will dynamically assigned. After using the IP addresses for subsequent returned reassignment to the global gateway. Global Gateway stores during any time when a particular mobile communication unit is not in contact with the network, all data packets between, the for the mobile Communication unit are determined.

As from the above it can be seen, allows the use of a temporary, this means dynamically-assigned address, that data even to a wireless received communication station , if the wireless communication station is no permanent Identifier is associated, and this is also advantageous when it comes to Routing data to the wireless communication station comes. However, it is also seen that any improvement in the Allocation of dynamically-assigned address and the associated Routing of data is also valuable.

SUMMARY OF THE INVENTION

consequently treated the present invention, a main problem of providing of ways and means to achieve the assignment of an effort assigned address and the associated routing data, So that the Assignment and routing efficient and flexible (optimally) is.

Among one aspect of the invention, the above mentioned problem with a method claim 1 and a corresponding arrangement solved according to claim. 13

Among another aspect of the invention, the problem explained above with an address server according to claim 16 solved wherein the address server for use with the above-mentioned A method and arrangement suitable.

On Main advantage of the invention is thus that it the Allocation of dynamically allocated addresses and the associated provides routing data in a manner that efficiently and is versatile, especially for applications where mobility is a key to consider Factor.

On Another advantage of the invention is that the invention also for packet data as for circuit-switched Data may be used.

On Skilled artisan will appreciate that other problems solutions and advantages with certain embodiments, of the invention are connected are as apparent from the detailed description is.

SUMMARY THE DRAWINGS

<figref idrefs="S18">1</figref> provides a part functional block, part schematic representation of a Communication system is, in which an embodiment of the present Invention operable is.

<figref idrefs="S19">2</figref> provides a GPRS attach sequence is, one embodiment of the present Invention forms a portion thereof.

<figref idrefs="S20">3</figref> provides a Leitweglenkungsablauf a GPRS deactivation context of a embodiment of the present invention.

<figref idrefs="S21">4</figref> provides a part functional block, part schematic illustration similar to the in <figref idrefs="S18">1</figref> shown is that but a different way of working one embodiment of the present invention.

<figref idrefs="S22">5</figref> provides a graphical function block diagram of a portion of a public land mobile network represents the embodiment of a the present invention has.

<figref idrefs="S23">6</figref> provides a graphical function block diagram of a wireless communication station represents the embodiment of a the present invention has.

DESCRIPTION THE INVENTION

<figref idrefs="S18">1</figref> provides a communication system is, the total of <figref>10</figref> designated and in which an embodiment is the present invention operative. The communication system<figref>10</figref> is here a GPRS communication system, such as a system of the Global Systems for Mobile communication (GSM) comprising a General Packet Radio Service (GPRS) provides. Other communication systems can be represented similarly. It is further noted that the following description, although the operation of one embodiment of the describe the present invention, are received in the packet data, should, but that other types of data such as circuit-switched data, in a alternative embodiment the present invention may be communicated accordingly.

the communication system <figref>10</figref> has here is shown having a public Landbased home mobile radio network (Home PLMN) <figref>12</figref> and a Public Land Mobile Network foreign (foreign PLMN) <figref>14</figref> on. The home and the foreign PLMN are using an Internet connection <figref>16</figref> together connected. Although half in the figure for simplicity, a single Foreign PLMN is shown, an actual communication system usually a large Number of such PLMNs, of which individual connections to each other through Internet are connected, similar to the Internet <figref>16</figref>, in the the figure is shown.

the Home PLMN <figref>12</figref> comprises a serving packet switch (SPSN) <figref>18</figref> on which here with a base station <figref>22</figref> coupled is. Of theSPSN <figref>18</figref> is by means of a home PLMN-based network <figref>24</figref> With a gateway packet switching node (GPSN) <figref>26</figref> coupled. The GPSN <figref>26</figref> forms a gateway to the Internet <figref>16</figref> and forms a connection therewith. An Internet protocol address server (IAS) <figref>28</figref> also forms a portion of the home PLMN. Of the IAS <figref>28</figref> is using the home PLMN-based network <figref>24</figref> With the SPSN <figref>18</figref> and the GPSN <figref>26</figref> coupled.

the Home PLMN <figref>12</figref> allows the implementation wireless communication with a wireless communication station, here by a wireless host <figref>32</figref> shown. The wireless host <figref>32</figref> is shown as a notebook computer here. The notebook computer that the wireless host <figref>32</figref> forms, communicates with a home PLMN <figref>12</figref> by means of a mobile telephone or a PCMCIA wireless modem card or the like (not shown in the figure).

the Foreign PLMN <figref>14</figref> also has a serving packet support node (SPSN) <figref>38</figref> on which a base station (BS) <figref>42</figref> coupled is. The SPSN<figref>38</figref> additionally by a foreign PLMN based network <figref>44</figref> With a gateway packet support node (GPSN) <figref>46</figref> coupled. The GPSN<figref>46</figref> forming a transition the foreign PLMN <figref>14</figref> and is connected to the Internet <figref>16</figref> connected. The third-PLMN <figref>14</figref> further includes an Internet protocol address server (IAS) <figref>48</figref> on. The IAS<figref>48</figref> is by means of the foreign PLMN based network <figref>44</figref> With the SPSN <figref>38</figref> and with the GPSN <figref>46</figref> coupled.

The base station <figref>42</figref> allows the implementation wireless communication with a wireless communication station <figref>50</figref>. here represented by a wireless host <figref>52</figref>, here is the wireless host <figref>52</figref> again by a notebook computer formed of using a mobile phone <figref>53</figref> coupled. In another embodiment, the wireless host instead with a PCMCIA wireless modem card or like coupled.

Of the wireless host <figref>52</figref> is the home PLMN <figref>12</figref> registered, and when it is in the location shown in the figure, keeps it As a guest in one of the foreign PLMN <figref>14</figref> included transport on. In the embodiment shown in the figure, the wireless host <figref>52</figref> an exemplary permanent address, namely 192.54.128.16. As described herein below, during operation of an embodiment of the present invention the wireless host <figref>52</figref> further effort a temporary assigned IP address, here the temporary address 194.45.127.250.

In the figure is also a stationary host <figref>54</figref> shown. The stationary host <figref>54</figref> is by means of a wired Connected to the Internet <figref>16</figref> connected.

In Operation is the transfer of data, here packet data, between corresponding instances conducted such as the wireless host <figref>52</figref> and the stationary host <figref>54</figref>, The wireless host <figref>52</figref> is assigned a temporary IP address, and Packet data to the wireless host <figref>52</figref> transmitted should be addressed with the temporary IP address. The temporary IP address is assigned to the wireless host dynamically. Because a such address assignment temporary is, the temporary IP address can be assigned again to subsequent communication allowing another wireless host. Also supports Assignment of a temporary IP address the wireless host <figref>52</figref> the optimal routing of Data packets to the wireless host, particularly when the wireless host <figref>52</figref>As shown, as a guest in a foreign network staying. decreased delay times and faster data throughput as a result of such optimal routing allows.

<figref idrefs="S19">2</figref> provides an allocation or attach sequence of an embodiment of the present invention represents, by the wireless host <figref>52</figref> (Shown in <figref idrefs="S18">1</figref>) a temporary assigned address. By the wireless host with a temporary IP address is equipped, can the wireless host <figref>52</figref> the data in the communication system <figref>10</figref> to transfer. The allocation of temporary IP address the wireless host <figref>52</figref> is by the IAS <figref>28</figref> or <figref>48</figref> provided.

Of the wireless host <figref>52</figref> identified in accordance with a Registration request with a mobile station identifier (MSI) when an SPSN, such as the SPSN <figref>38</figref>, In the exemplary embodiment are the registration request further indicates whether the wireless host <figref>52</figref> a temporary requesting IP address and from which IAS, i.e. IAS <figref>28</figref> or IAS <figref>48</figref>, Assigned to the IP address shall be.

the Point-to-Point (PPP) protocol that is used, or the IPCP protocol, the as network control protocol (NCP) included in the PPP protocol is, has the option of seeking the IP address for a wireless host to be used. A description of such Option in the document IETF RFC <figref>1332</figref> provided, the PPP Internet Protocol Control Protocol. Such a procedure is normally via a point-to-point connection performed. however is in a wireless packet radio system the PPP protocol between the wireless host and a radio transceiver apparatus. The radio transceiver device comprises the host to an IP address. By the request of an IP address of a registration request is assigned to the registration request is to a SPSN forwarded, such as the SPSN <figref>38</figref>, The SPSN<figref>38</figref> passes after the request of an IP address to a suitable IAS further, such as the IAS <figref>48</figref>,

in the SPSN <figref>38</figref> is a context for the wireless host <figref>52</figref> furnished. The GPSN <figref>46</figref>, Of the address space for the temporary IP addresses processed, either the temporary informed IP address or can the temporary address of a location register retrieve, depending of the system in which the service is implemented.

in the SPSN <figref>38</figref> are from a mobile device placed either end-user data packets encapsulated into IP packets, to an appropriate GPSN <figref>46</figref> tunneled and from there fixed hosts in external networks such as the fixed host <figref>54</figref>or another GPSN, such as the GPSN <figref>26</figref>forwarded to be in order after another wireless host, such as the host <figref>32</figref>To seek. If data to the wireless host<figref>52</figref> to are set to be in the GPSN that processes the temporary IP addresses, such as the GPSN <figref>46</figref>, End-user data packets encapsulated and then through the base network <figref>44</figref> to that SPSN tunneled, the present the wireless host <figref>52</figref> supplies, here SPSN <figref>38</figref>,

Conventional Location updating procedures can be performed, and the same temporary IP address is the wireless host <figref>52</figref> as long as assigned, as the wireless host <figref>52</figref> in the same PLMN, here PLMN <figref>14</figref>. is registered or is staying as a guest in it.

Of the in <figref idrefs="S19">2</figref> illustrated Attach drain is an exemplary GPRS attach sequence for a wireless host, the temporary IP address assigned should. As already mentioned was, the allocation of the temporary IP address from a dynamic Character, and the temporary IP address to the terminal the deactivation of the communications with a particular wireless be assigned to host again.

First and as with the first and second sequence step <figref>74</figref> or. <figref>76</figref> designated A PPP link between the wireless host <figref>52</figref> and the radio transceiver, here one with him arranged mobile telephone (MT) <figref>53</figref>, built up. The PPP link is in response to a configuration request of the transmission route control protocol (LCP), the first procedural step <figref>74</figref> forms, and LCP configuration acknowledgment, the second sequence step <figref>76</figref> forms constructed. It can Naturally other types are used by protocols to these process steps and those process steps that are described below to perform.

If the PPP link has been established, the host configured <figref>52</figref> the transmission line for the Using a specific network protocol, here an Internet Protocol (IP). If the host<figref>52</figref> assigned a permanent IP address or has been the assignment of a temporary IP address is desired, such as for purposes of route optimization, the mobile phone is Send also a request for a temporary IP address, here the third operation step <figref>78</figref> and represented by a NCP configuration request formed.

The mobile station <figref>53</figref> conventionally generated signals to a Channel assignment from the base station <figref>42</figref> to ask how by the sequence step <figref>82</figref> designates, and the base station <figref>42</figref> responds with an immediate assignment, such as on a slow Data control channel (SDCCH), as with the process step <figref>84</figref> designated. If the radio transceiver is not registered, an attach request is generated and the SPSN <figref>38</figref> sent, as with the process step <figref>86</figref> designated. Thereafter, with block <figref>87</figref> Marked conventional authentication procedures implemented, for example, in the GPRS cipher mode, and by the SPSN <figref>38</figref> an attach response is generated and sent to the radio transceiver, here designated by the sequence step <figref>88</figref>, If the radio transceiver already is assigned to the PLMN, has the Attach procedure not be repeated.

If the attach procedure is completed, transmits the radio transceiver a Aktivierungsleitweglenkungskontext request to the SPSN <figref>38</figref>, The Aktivierungsleitweglenkungskontext request is in the figure by the sequence step <figref>92</figref> designated. The Aktivierungsleitweglenkungskontext request comprises a request for a temporary IP address. Such Request is forwarded from the NCP configuration request the flow of step <figref>78</figref> forms. By SPSN<figref>38</figref> becomes an NEI-fetch request to an appropriate Internet protocol address server sent here to Server <figref>48</figref>, The selection of the IAS, of the the temporary IP address to be assigned is determined by the wireless host <figref>52</figref> performed. instead IAS <figref>48</figref> you can select another IAS, such as the IAS <figref>28</figref>,

As Response to the request, which by the sequence step <figref>94</figref> designated is an NEI retrieval response is generated by the IAS, as with the Process step <figref>96</figref> designated. The NEI retrieval response has the temporary IP address, the host the <figref>52</figref> by the IAS <figref>48</figref> assigned has been. The NEI retrieval response, the drain step to<figref>96</figref> forms, also includes information on which refers to the GPSN that assigned the IP address is to be processed, and bywhich a context with such GPSN, here the GPSN <figref>46</figref>, Has been established and a GPRS context has been activated, indicated by block <figref>97</figref>, Is by the SPSN <figref>38</figref> a Aktivierungsleitweglenkungskontext response the radio transceiver forwarded. The Aktivierungsleitweglenkungskontext response is in the figure by the sequence step <figref>98</figref> designated.

If Aktivierungsleitweglenkungskontext the response represented by the IAS <figref>48</figref> has assigned a temporary IP address, the Radio transceiver has been received, the assigned IP address as part of a NCP Configuration confirmation to host <figref>52</figref> forwarded what in the figure by the sequence step <figref>102</figref> designated is.

If received the Aktivierungsleitweglenkungskontext response by the radio transceiver is a shortcut to the SPSN is also in the radio transceiver <figref>38</figref> furnished, and a logical link between the radio transceiver and the SPSN is established. The host<figref>52</figref> is then able to send IP data packets to the radio transceiver, which thereafter must be forwarded to a specific host.

at completion of Communication or if otherwise desired, solves the wireless host <figref>52</figref> the repeal the structured transfer layer. An exemplary GPRS Deaktivierungsleitweglenkungskontext flow is in <figref idrefs="S20">3</figref> shown. The host<figref>52</figref> triggers the deactivation by sending a termination request in PPP or rather on the LCP of PPP from.

If the host <figref>52</figref> the network layer communication means of a Termination request completed in the IPCP PPP or when an inactivity timer the PPP performs a time-out, the temporary IP address, assigned to the wireless host, a supply of unused IP addresses in the IAS <figref>46</figref> returned. However it may be, that data packets the network the wireless host <figref>52</figref> have not yet reached. In order routing such data to another wireless Host to prevent, when the temporary IP address reused is, should such an IP address, after they returned to the stock the unused IP addresses has been introduced, at least for a predetermined period of time are not reused. is After the IP address is available again, in order to be reused.

As in <figref idrefs="S20">3</figref> shown is an NCP termination request by the wireless host <figref>52</figref> generated and sent to the radio transceiver. The NCP termination request is in the figure by the sequence step <figref>104</figref> designated. The NCP (IPCP) termination request is over the PPP link the radio transceiver produced as in Process Step <figref>104</figref> designated. The radio transceiver responds with an NCP (IPCP) Completion Notice that with the figure the sequence step <figref>106</figref> is designated.

After that waiting the radio transceiver for a Period, at least as long as a reboot time. On Such a period is in the figure by the arrow <figref>108</figref> designated. Thereafter, the radio transceiver sends a Deaktivierungsleitweglenkungskontext request to the SPSN <figref>38</figref>, The Deaktivierungsleitweglenkungskontext request is in the Figure by the sequence step <figref>112</figref> designated. The Deaktivierungsleitweglenkungskontext request includes a statement that the Released temporary IP address can be.

The Request to release the IP address, is in SPSN <figref>38</figref> one assigned NEI release request that the IAS <figref>48</figref> Posted is. Such NEI release request is in character with the Process step <figref>114</figref> designated. When the IAS<figref>48</figref> receive has been, the IAS sends an NEI released response to the SPSN. Such Answer is in the figure by the sequence step <figref>116</figref> designated. The SPSN, it responsive, starts a context deactivation procedure for GPSN <figref>46</figref>, Such context deactivation procedure is connected to the block <figref>118</figref> indicated in the figure. Then, and as with the process step <figref>122</figref> referred, is a Deaktivierungsleitweglenkungskontext response from SPSN <figref>38</figref> sent to the radio transceiver and the Deaktivierungsleitweglenkungskontext flow will be terminated.

Again regarding <figref idrefs="S18">1</figref> is the routing of Packet data to the wireless host <figref>52</figref> optimized if the host in foreign PLMN <figref>14</figref> staying as a guest, as the wireless host <figref>52</figref> by IAS <figref>48</figref> the foreign PLMN held by the IAS <figref>28</figref> the home PLMN <figref>12</figref> a temporary IP address can be assigned. As with respect to<figref idrefs="S19">2</figref> described, while the registration of the wireless host, a request for a temporary IP address performed.

while of IAS <figref>48</figref> selected is to the wireless host <figref>52</figref> the temporary address allocate, must the Registration request not to home PLMN <figref>12</figref> returned will. If the wireless host assigned a temporary IP address is, the assigned address is determined by the wireless host <figref>52</figref> a passed corresponding host, such as the fixed host <figref>54</figref>, After the transfer is performed by packet data in the context of a particular service. Of the Datenleitweg for the packet data, with the temporary IP address of the wireless addressed hosts are, in the figure with the arrows <figref>128</figref>. <figref>132</figref> and <figref>134</figref> designated.

Because the temporary Address the wireless host by the foreign-IAS <figref>48</figref> of Foreign PLMN is instead assigned by the home PLMN, the routing is of data to the wireless host <figref>52</figref> optimized, whereby the Communication delay times minimized and the communication throughput can be maximized. And because the temporary IP address can be reassigned, problems are prevented, the with the limited supply of permanent addresses, wireless hosts can be assigned, are connected.

<figref idrefs="S21">4</figref> provides again, the communication system <figref>10</figref> with elements, which fall in the representation of the <figref idrefs="S18">1</figref> shown correspond. Such elements are given the same reference numerals referred to as those which have been used corresponding in <figref idrefs="S18">1</figref> illustrated elements denote. Since the Connection and operation of such elements with those are identical, the on with reference <figref idrefs="S18">1</figref> described have been, should the above description are not repeated.

The display of <figref idrefs="S21">4</figref> provides a Datenleitweg packet data represents when the wireless host <figref>52</figref> assigned permanent address is used to packet data to the wireless Host to address. When the permanent address is utilized, both to from a mobile unit dispatches as directed also to a mobile data means the GPSN <figref>26</figref> the home PLMN <figref>12</figref> forwarded will. The data between the wireless host<figref>52</figref> and a corresponding host, here the stationary host <figref>54</figref>, transmitted be, are connected to the segments <figref>136</figref>. <figref>138</figref> and <figref>142</figref> designated.

On Comparison of the Datenleitwege by the packet data in the exemplary display of <figref idrefs="S21">4</figref> are to be used, with the display of <figref idrefs="S18">1</figref> pictorially represents the benefits is represented by the operation of one embodiment of the present invention allows will. Since the in<figref idrefs="S18">1</figref> shown not Datenleitweg requires that the Data by the GPSN <figref>26</figref> between the stationary host <figref>54</figref> and the wireless host <figref>52</figref> be forwarded to the Communication delay times minimized and the communication throughput is maximized.

<figref idrefs="S22">5</figref> provides Portions of the foreign PLMN <figref>14</figref> accurate. The foreign PLMN <figref>14</figref> has presentation according to SPSN <figref>38</figref>. the GPSN <figref>46</figref> and the IAS <figref>48</figref> on. As already indicated, form of SPSN <figref>38</figref> and the GPSN <figref>46</figref> a section the foreign PLMN based network <figref>44</figref>, But are for illustration shown separately.

the SPSN <figref>38</figref> includes a receiver <figref>152</figref> for receiving by the wireless host <figref>52</figref> request generated a temporary Address on. If the request for a temporary address has been received is, the request to a transmitter <figref>154</figref> forwarded the request to a receiver, the <figref>156</figref> IAS <figref>48</figref> forwards. The by the receiver <figref>156</figref> received Request is to a producer of temporary addresses <figref>158</figref> to hand over, of an available temporary IP address from a database <figref>162</figref> retrieves.

The retrieved temporary IP address is provided to a transmitter <figref>164</figref> handed over the to the temporary IP address a receiver <figref>166</figref> of SPSN <figref>38</figref> forwards. The received temporary address is a Leitweglenkungskontext producers <figref>168</figref> to hand over, of as a component of a Leitweglenkungskontext determiner <figref>172</figref> having. information on the by the determiner <figref>172</figref> the producer <figref>168</figref> certain be Leitweglenkungskontext a Leitweglenkungskontext receiver <figref>174</figref> the GPSN <figref>46</figref> provided.

signals representing such information, are to a Leitweglenkungskontext producers <figref>176</figref> to hand over, the routing tables updated, here represented by a routing table <figref>178</figref>, The packet switches associated, here represented by a packet switch <figref>182</figref>,

As well causes the Leitweglenkungskontext producers <figref>168</figref>That routing tables, here represented by a routing table <figref>184</figref>, updated will. The routing tables are the packet switches assigned, here represented by a packet switch <figref>186</figref>, Thereby a Leitweglenkungskontext generated in foreign PLMN to the transmission of data packets between the wireless host <figref>52</figref> and a corresponding host, such as host <figref>54</figref>To enable.

<figref idrefs="S23">6</figref> provides the wireless communication station <figref>50</figref> , which fall through here the wireless host <figref>52</figref> and a mobile terminal <figref>53</figref> educated is. The wireless host is here shown as he a request generator for a temporary address <figref>192</figref> comprises a request for a temporary address generated as previously described. The requirement of a temporary address to the mobile terminal<figref>53</figref> to hand over, sending the request from there.

If the wireless host <figref>52</figref> been assigned a temporary IP address is the temporary IP address to the wireless communication station <figref>50</figref> Posted and in the mobile terminal <figref>53</figref> receive. The received temporary IP adress is to a receiver temporary addresses <figref>194</figref> the wireless communication station passed. The by the receiver <figref>194</figref> received temporary IP address is to a packet data formatter <figref>196</figref> to hand over. The packet data formatter<figref>196</figref> according to a / a specific application or service operative here by the application block <figref>198</figref> functional shown. Packet data through the wireless host<figref>52</figref> generated want to be a packet data transmitter <figref>202</figref> passed, the Such packet data to the mobile terminal <figref>53</figref> Hands, so that they are sent from there.

The wireless communication station <figref>50</figref> has further illustration according to a additional transmitter <figref>204</figref> on, operably is temporary addresses by means of the mobile terminal <figref>53</figref> directly send to a correspondent host.

The Operation of the embodiment of the present invention as described above furnishes, a wireless communication station with a dynamically assigned Address that are addressed with the data to the communication station are to be forwarded. If data with the dynamically allocated Address are addressed, they are, such as packet data to the wireless Communication station forwarded. Due to the temporary and dynamic address assignment, the routing data are optimized for communication station. Communication delay times be minimized and throughput is maximized. Because the wireless Communication station no permanent address provided must be also problems prevent that with a limited supply of permanent Addresses are connected.

The foregoing descriptions relate to preferred examples for implementing the invention, and the scope of the invention should not be limited necessarily by this description. The scope of the present invention is following through the Claims defined.