Abstract:
The present invention relates to methods, apparatuses and a system in connection with pushing of packet data from an originator to a wireless communication station  20.  When a network address is received by the wireless station  20  from a server  50  wishing to push packet data to the wireless station, the corresponding identity is acquired by the wireless station. Based on this identity the wireless station determines if packet data reception from the originator is desired. If such reception is desired, the wireless station establishes a packet data session with the originator. Using this packet data session, the originator is able to transfer, or push, packet data to the wireless station. Thus, according to the invention, pushing of packet data from an originator to a wireless communication station is only facilitated if reception of packet data from that originator is desired, something which can be controlled in real-time.

Description:
[0001]    This application is a Continuation-in-Part of U.S. patent application Ser. No. 09/684,057, filed Oct. 6, 2000, which claims priority to Sweden Application Ser. No. 9903637-8, filed Oct. 8, 1999. The present application also claims priority to EPO Application No. 01850013.4, filed Jan. 17, 2001. The above applications are incorporated herein by specific reference.  
     
    
     
       BACKGROUND OF THE INVENTION  
         [0002]    1. The Field of the Invention  
           [0003]    The present invention relates to methods, apparatuses and a system in connection with pushing of packet data from an originator to a wireless communication station.  
           [0004]    2. Background and Brief Summary of the Invention  
           [0005]    Today, different kind of digital radio communications networks that support packet data transfer are being evolved. This means that mobile users having access to these radio communication networks are provided with the possibility to communicate packet data with different packet data networks, such as with the Internet, but also with corporate intranets and X.25 networks and the like. Thus, the digital radio, or wireless, communication network will be a wireless extension of, for example, the Internet and existing X.25 networks. Subscribers to such a radio communication network, i.e., the mobile users, will be able to benefit from most of the applications designed for these data packet protocols, such as Web browsing and exchange of e-mails etc., from their wireless equipment with which they access the wireless communication networks. Furthermore, a number of new mobile data services are currently being developed which will make use of these packet data transfer capabilities, while the performance of existing mobile data services will be improved.  
           [0006]    Many of the new and existing mobile data services will make use of the possibility to push data to mobile users. Typically, to push data to a user means that a push server of a system or network automatically provides the user with some kind of information, i.e., the transfer of information is performed on the initiative of the push server. Often this information is of the kind which is desired by the user, and therefore defined by a set of criteria in order to meet the desires of the user, e.g., information to which the user subscribes. However, since there are no standardized mechanism for preventing certain information to be pushed, in practice, any server may push any information to any user.  
           [0007]    The technology of pushing information is today perhaps most widely used for pushing information to a stationary user, such as a user operating a computer connected to the Internet. However, with the rapid growth of mobile communications, in combination with the flexibility of being able to be reached by pushed information at any location, the possibility of receiving pushed information from a push server will become more and more interesting for users that are connected to wireless communication networks.  
           [0008]    One of the most important grounds for the development described above is, besides the introduction of packet data transmissions to/from the wireless communication stations operated by the mobile users, the technology enhancements of the radio communications networks, such as the cellular radio communications networks, which provide higher and higher bandwidths for these packet data transmissions. Examples of wireless communication network with higher bandwidths and with support for packet data transfer to the wireless terminal of a mobile user are PDC-P networks (Pacific Digital Cellular), which in Japan provides the existing I-mode service, GSM networks (Global System for Mobile Communications) providing GPRS services (General Packet Radio Service), systems using radio networks based on EDGE technology (Enhanced Data Rates for GSM and TDMA/136 Evolution) or on WCDMA technology (Wideband Code Division Multiple Access), or any other forthcoming new generation of wireless communication networks which are known as UMTS networks (Universal Mobile Telephony Standard), or 3G networks, and which are based on the broadband radio networks WCDMA or cdma2000.  
           [0009]    The pushing of packet data to a mobile user corresponds to a process in which the wireless communication network initiates the packet data transfer to the user&#39;s wireless communication station, wherein the packet data being transferred most often is received by the wireless communication network from an external source, i.e., a push server on an external network which is operatively connected to the wireless communication network. When pushing information to a wireless communication station there are three important requirements that have to be met in order for a wireless communication network to be able to initiate the packet data transfer to the wireless station. These requirements are that (1) the wireless station has been switched on; (2) the wireless station has identified itself to those parts of the wireless communication network that provides the packet data service; and that (3) a Packet Data Protocol (PDP) address has been allocated to the wireless station.  
           [0010]    After the requirements above have been met, measures are taken by the wireless network for initializing and activating a packet data service to the wireless station, measures that are well known in the art. After activation of the packet data service, packet data addressed to the PDP address that has been allocated to a wireless station will be routed to that station. A PDP address can be allocated to the station either as a static or a dynamic PDP address. Thus, the PDP address to be used by a server wishing to push data to a mobile communication station, i.e., to transfer data without the station having specifically requested the data, is either a permanent (static) or a temporary (dynamic) address allocated to that station.  
           [0011]    The PDP address, irrespective of whether it is static or dynamic, needs to be known to a server that wishes to transfer packet data to the station. The PDP address can become known to the server by making an inquiry to the appropriate repository, possibly different repositories depending on whether static or dynamic addresses are used, in the operator&#39;s wireless communication network.  
           [0012]    In U.S. patent application Ser. No. 09/684,057, filed on Oct. 6, 2000, and incorporated herein by reference, a number of drawbacks related to the above described technique of inquiring for a mobile users PDP address are discussed. These drawbacks relate to the consequences of such things as: signaling load against the repository storing the PDP addresses; a change of the PDP address allocated to a specific mobile user from time to time; and the routing of PDP address requests to repositories.  
           [0013]    The solution, according to the disclosure of the above identified patent application, is that a networks server, that wants to transfer packet data to a wireless communication station via a wireless communication network, requests that the wireless station sets up a Packet Data Protocol connection with the server. The request is accomplished by sending a message to the station, via a message service provided by the wireless network, using a subscriber&#39;s unique user identification number (such as a MSISDN number). In reply to the received message, which includes the packet data network address of the requesting server, the wireless station identifies itself to the packet data service part of the wireless network, if not already identified, activates a provided packet data service, if not already activated, and establishes a PDP connection with the requesting server. Using this PDP connection, the server may transfer packet data to the wireless communication station. This solution furthermore enables packet data to be transferred, or pushed, to a wireless station regardless of which current state the wireless station is in with respect to the packet data service of the wireless network.  
           [0014]    When a packet switched connection, rather than a circuit switched connection, is used for transferring data to/from a user&#39;s wireless station, which for example is the case when introducing GPRS in a GSM system, it will be possible for the mobile user to be constantly connected not only to the wireless network, but also to the Internet or some other packet data network via the wireless network and an interconnecting gateway. As the mobile user is constantly connected, the user will be charged for the actual bandwidth he uses. This means that the mobile user will be charged for each packet transmitted or received by the user, rather than for the time duration of the data transfer. Thus, a subscriber will be charged for any information received as packet data, regardless of which source that transfers, or pushes, the packet data to the subscriber.  
           [0015]    The above described solution provided by identified U.S. patent application Ser. No. 09/684,057 allows any network server to transfer a packet data network address to a subscriber by addressing the subscriber&#39;s unique user identification number. In this respect it would be desirable that the mobile user more easily could control to which network server he initiates a PDP connection. Moreover, it would be preferred that the mobile user could perform this control in real-time, thus enabling the mobile user to make a decision whether or not to establish a PDP connection at the particular moment when a server wishes to transfer packet data to the mobile user. A drawback with U.S. patent application Ser. No. 09/684,057 is that the above described solution does not include any satisfactory means for enabling a mobile user to perform such a desired control of PDP connection establishment, and thus, of information transfer from any network server wishing to transmit data to the mobile user. Thus, it does not provide a satisfactory scheme for preventing that a mobile user receives non-desired information. Not only is reception of non-desired information time consuming and frustrating for the mobile user, it is also costly since the mobile user have to pay for the received packet data over his subscription bill from the operator.  
           [0016]    The drawbacks described above regarding the reception of non-desired information from any network server, and the additional drawback of being charged by an operator for such information, are also present in any situation where a network server knows the packet data network address of the user in advance and uses this address for establishing a packet data session with the user&#39;s wireless station.  
           [0017]    An object of the present invention is to overcome at least one of the drawbacks described above that are present in connection with pushing packet data, i.e., transmission of packet data on an originator&#39;s own initiative, from an originator to a mobile user in a wireless communication network.  
           [0018]    According to the present invention, said object is achieved by methods, a computer-readable medium, a wireless communication station and a system having the features as defined in the appended claims and representing different aspects of the invention.  
           [0019]    According to the invention, when a wireless communication station from an originator of information receives the originator&#39;s network address, the wireless station acquires an identity corresponding to the received network address. This identity is used as basis when the wireless station determines if packet data reception from the originator is desired. If such reception is desired, the wireless station establishes a packet data session with the originator. Using this packet data session, the originator is able to transfer, or push, packet data to the wireless station.  
           [0020]    Thus, according to the invention, pushing of packet data from an originator to a wireless communication station is only facilitated if it is determined by the wireless station that reception of packet data from the originator is desired. Since the wireless station will receive any originator&#39;s network address and then decide whether or not to facilitate reception of packet data based on a corresponding identity only, any originator with the ability to transfer its network address to the wireless station will have the potential ability to push packet data to the wireless station. Of course, provided that the originator has access to a packet data network which is operatively connected to the wireless communication network. However, such pushing of packet data can only be effectuated if the user of the wireless station chooses to facilitate reception of the pushed packet data.  
           [0021]    Furthermore, the invention enables a user of a wireless station to control the reception of pushed packet data without requiring that the user, or its wireless station, has an established relationship with any potential originator providing pushed packet data, or that the wireless station has been particularly configured with respect to any potential originator, since such control solely is based on the identity of the originator. Moreover, the user is able to perform this control in real-time. For example, a user may choose to receive pushed packet data from an originator known to have interesting information relating to a geographical region, or from an originator which the user only sometimes wants information from in dependence upon, e.g., his mood or his available time to read or otherwise perceive the information.  
           [0022]    According to the invention, the wireless station is responsible for acquiring the identity corresponding to a network address received from an originator. Thus, this is performed without any participation of the originator. This feature is advantageous since it adds a security aspect to the reception of pushed information. An originator will not be able to hide behind a false identity and he will have nothing to gain by transmitting a “stolen” or “borrowed” network address to the wireless station. Preferably, the identity corresponding to the received network address is acquired by using an address translation server. Since an address translation server typically is designed to regularly check what identity that corresponds to what network address, and to store these relationships in some kind of repository, the address translation server will upon request indicate the identity that currently is associated with a particular network address.  
           [0023]    Moreover, since the packet data session used for the information transfer from the network server is established by the wireless communication station, there is no need to beforehand provide any network server with the network address of the wireless communication station. An advantage with this, among others, is that a network server can not establish a session to the wireless communication station in order to transfer, or push, information, possibly non-desired, to the wireless station.  
           [0024]    A further advantage provided by the establishment of the packet data session from the wireless station, is that the originator does not generate any signaling load against any repository in the wireless network storing packet data network addresses, something which otherwise can be a heavy burden on the repository when numerous originators, or servers, are trying to acquire packet network addresses to wireless stations connected to the wireless network. Furthermore, if dynamic packet data network addresses are used by the wireless network, which most often is the case, the burden will be even heavier since the network address allocated to a specific wireless station will change from time to time. Moreover, when a wireless station is roaming between different wireless networks of different operators, the problem of determining to which operator&#39;s repository a server&#39;s requests for a packet data network addresses should be routed is avoided.  
           [0025]    According to an exemplifying embodiment, a user is provided with the ability to control reception of pushed packet data in real-time by having the wireless station display the identity to the user, and then accept a user input in response thereto. In response to a confirmation, the wireless station effectuates an establishment of a packet data session with the originator. However, if the user inputs a rejection, a packet data session is not established, and reception of pushed packet data is thereby not facilitated.  
           [0026]    Advantageously, the network addresses received by the wireless station is an Internet Protocol (IP) addresses. In this case the address translation server is preferably a DNS server (Domain Name System) which upon reception of an IP address returns a server host name.  
           [0027]    According to an embodiment of the invention, the wireless station receives the originators network address in a short message provided to the wireless station by a short message service. The establishment of a packet data session with the originating server is either made based on this network address, or, via the address translation server, based on the corresponding identity of the originator. Preferably, an application executing in the wireless communication station, and controlling its operation, is responsible for the establishment of the packet data session. An originator is typically connected to a packet data network which is operatively connected to the wireless communication network. However, an originator may also be directly connected to the wireless communication network.  
           [0028]    In an embodiment, use is made of an originator identification code. By verifying that a server, with which a packet data session is established for reception of packet data, uses the same identification code as the originator of a received network address, yet another security level is added.  
           [0029]    It is to be understood that what is meant by the expression wireless communication station in this document, sometimes herein referred to only as wireless station, is either a stand-alone RF (Radio Frequency) transceiver having processing capabilities and displaying means, such as a mobile telephone or a hand-held PDA (Personal Digital Assistant), or, a RF transceiver together with any kind of portable or stationary equipment having processing capabilities, such as a portable laptop computer or a stationary personal computer, wherein the RF transceiver is arranged in communication with the portable or stationary equipment.  
           [0030]    Even though the following description of an exemplifying embodiment will refer to a GSM network providing a GPRS service and an SMS-C (Short Message Service Center) providing a short message service, it is to be understood by those skilled in the art that the invention is not limited to these systems. The invention is advantageously applied to any wireless communication network that provides packet data transmissions to its connected users and that has an associated message service for transmitting short messages to the users. Such wireless communication networks have been exemplified in the background part of this application.  
           [0031]    These and other objects and features of the present invention will become more fully apparent from the following description and appended claims, or may be learned by the practice of the invention as set forth hereinafter.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0032]    In order that the manner in which the above recited and other advantages and features of the invention are obtained, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Understanding that these drawings depict only typical embodiments of the invention and are not therefore to be considered limiting of its scope, the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:  
         [0033]    [0033]FIG. 1 schematically shows an exemplifying overall system environment in which an embodiment of the invention is included and operable; and  
         [0034]    [0034]FIG. 2 is a flow chart of an embodiment of a method according to the invention which is practiced by a wireless communication station.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0035]    With reference to FIG. 1, an exemplifying embodiment of the invention will know be described in greater detail. FIG. 1 shows a wireless communication network  10 , a wireless communication station  20 , a node  30  for generating short messages for transmission to wireless communication stations, an address translation server  40 , and an originator in the form of a network server  50  operatively connected to the wireless communication network  10 . The wireless communication network is exemplified with a GSM network (Global System for Mobile Communication) and the wireless communication station with a GPRS mobile station. The packet data transferring capabilities of the GSM network  10  is provided by the GPRS service (General Packet Radio Service). GPRS being a standardization from the European Telecommunications Standard Institute (ETSI) on packet data in GSM systems. The node for generating short messages is exemplified with a SMS-C (Short Message Service Center) and the address translation server with a DNS server (Domain Name System). The network server  50  could be any server connected to the Internet or to a corporate Intranet to which the wireless communication network  10  is operatively connected by means of an appropriate gateway (not shown).  
         [0036]    The architecture and operation of a GSM Network providing a GPRS service, as well as the standardization thereof, should be well known to persons skilled in the art. For this reason, only those features or aspects of GSM and GPRS that are of direct relevance to this described embodiment of the invention will be described herein.  
         [0037]    A GSM network  10  which includes a GPRS service for handling packet data traffic is equipped with a Serving GPRS Support Node (SGSN) (not shown) and a Gateway GPRS Support Node (GGSN) (not shown). The SGSN is the node within the GSM infrastructure that sends and receives packet data to and from a wireless GPRS mobile station  20  via a Base Station System (not shown). The GPRS mobile station  20  communicates with the Base Station System over an air interface in accordance with the standardization of GSM and GPRS. The SGSN also transfers packets between the GPRS station  20  and the GGSN. Furthermore, the SGSN handles PDP contexts (Packet Data Protocol) for connections with any server in any external packet data network, such as with the network server  50  which is operatively connected to the GSM network  10 . The GGSN, which is connected to the SGSN, is the gateway of the GSM/GPRS system to external packet data networks and routes packets between the SGSN and an external packet data network, e.g., the Internet or an corporate Intranet. For more information about GPRS, reference is made to ETSI standardization documents EN 301 113 V6.1.1 (1998-11) and Draft ETSI EN 301 344 V6.4.0 (1999-08), both documents which are incorporated herein by reference.  
         [0038]    Furthermore, the architecture and operation of the SMS-C and the DNS server are well known to persons with ordinary skills in the art, thus, only features of direct relevance to the present embodiment will be described herein.  
         [0039]    The wireless communication station of the present invention, i.e., the GPRS mobile station  20  in the embodiment of FIG. 1, includes a state of the art microprocessor  21 , a main memory  22  implemented by read only memory (ROM) and/or random access memory (RAM) or equivalents thereof, Input/output circuitry, such as a display  26  and a keyboard/keypad  27 , for communicating with a user, interface circuitry  23  in the form of transmitting/receiving radio frequency circuitry for communicating with the GSM network via an antenna  25  and the air interface, a bus  24  interconnecting the elements of the GPRS mobile station, as well as other appropriate components. Of these elements, at least some are controlled or otherwise designed to facilitate the practice of the method of the invention.  
         [0040]    The microprocessor  21  executes appropriate computer-executable components stored in the main memory  22 , thus controlling the elements and the overall wireless communication station/GPRS mobile station  20  to function in accordance with the method of the invention. Alternatively, these computer-executable components are stored on a pre-recorded disk, in a pre-programmed memory device, or any other computer-readable medium being separate from the wireless communication station  20 . When the wireless communication station  20  and its included microprocessor  21  is provided with access to this computer-readable medium, its stored computer-executable components will direct the microprocessor  21  to control the overall wireless communication station  20  to function in accordance with the method of the invention.  
         [0041]    The operation of the wireless communication station/GPRS mobile station  20  will be more fully understood from the description below and from the description of the flow chart shown in FIG. 2.  
         [0042]    The operation of the overall system and of the wireless communication station/GPRS mobile station in FIG. 1 in accordance with the embodiment will now be described in a step by step fashion, wherein each step has a reference numeral in FIG. 1. The described operation is started when the originator, i.e., the network server or push server  50 , wants to push packet data over a TCP/IP connection to a GPRS subscriber operating a GPRS mobile station  20 .  
         [0043]    1. In step  1  the push server  50  connects to the SMS-C  30  and submits a request that an SMS message (Short Message Service) should be generated and transmitted to a GPRS subscriber having a particular MSISDN number (Mobile Station Integrated Services Digital Network) in accordance with the numbering plan used. This is performed over a transport protocol, such as TCP/IP or X25, in accordance with techniques that are well known to persons skilled in the art. The push server includes its own network address, i.e., its Internet Protocol (IP) address if the push server is connected to the Internet or an Intranet, in the submitted request. The push server  50  also generates an identification code which is included in the submitted request as an originator identification code. Furthermore, a port number to be used when setting up a TCP/IP-based connection towards the server  50  is included.  
         [0044]    2. In step  2  the SMS-C  30  transmits the generated SMS message with the push server&#39;s  50  IP address and its generated originator identification code to the GPRS mobile station  20 . The transmission is performed through the GSM/GPRS network  10  over a GSM signaling channel or on a GPRS traffic channel in accordance with state of the art techniques.  
         [0045]    3. In step  3 , an application already executing in the GPRS mobile station  20 , or, which is started when the SMS message is received, extracts the payload of the SMS message. The SMS message could e.g., include an activation code, and if this code corresponds to a predefined code which is accepted by the application, the application processing proceeds, otherwise the application processing is stopped. Thus, if no activation code is found, the SMS message is treated in the usual way, which is outside the scope of the present invention. If the activation code is present, the application extracts the payload of the SMS message, i.e., the received IP address, port number and originator identification code. The received originator identification code is saved and a TCP/IP connection is set up towards the DNS server  40 . This TCP/IP connection is preferably set up in accordance with the GPRS connection phase described below. The IP address received in the payload of the SMS message is then sent to the DNS server  40  over the established TCP/IP connection.  
         [0046]    4. In step  4  the DNS server  40  looks up the IP address to find the corresponding identity, in this case a corresponding server host name. When found, the matching server host name is transmitted back to the GPRS station  20  over the TCP/IP connection. Thus, the GPRS station  20  is provided with the host name of the server  50  wishing to push information to it.  
         [0047]    5. In step  5  the application is to determine whether or not packet data reception from push server  50  is desired. This is performed by displaying the host name of server  50  received from the DNS server  40  to the user on the display  26  associated with the GPRS station  20 . The application then waits for the user to input a response using the keypad  27 . When viewing the displayed host name, the user decides whether or not he wants to receive pushed packet data from the particular server. If the user inputs “yes”, this indicates to the application that reception of packet data is confirmed, i.e., desired by the user. A “no” indicates that reception of packet data from push server  50  at this moment, and for some reason, is rejected. In the latter case, the execution of the application is stopped. If reception is confirmed, the application processing then continues to the GPRS connection phase.  
         [0048]    As previously described in the background section, when pushing information to a wireless communication station, there are three requirements that have to be met in order for a wireless communication network to be able to initiate the packet data transfer to the wireless station. These requirements, which are part of the GPRS connection phase, include that (1) the wireless station has been switched on; (2) the wireless station has identified itself to those parts of the wireless communication network that provides the packet data service; and that (3) a Packet Data Protocol (PDP) address has been allocated to the wireless station.  
         [0049]    In a GSM/GPRS network  10 , after the requirements above have been met, measures are taken by the GSM/GPRS network for initializing and activating a packet data service to the wireless GPRS station  20 , measures of the GPRS connection phase that are well known in the art. After activation of the packet data service, packet data addressed to the PDP address that has been allocated to a GPRS station  20  will be routed to that station. As described in the background section, the PDP address allocated to the GPRS station  20  is either a permanent (static) or a temporary (dynamic) address allocated to that station.  
         [0050]    Thus, in the GPRS connection phase the application identifies the GPRS station  20  for the packet data service part of the GSM/GPRS network  10 , if it is not already identified. This corresponds to checking whether the GPRS station  20  is GPRS attached or not. If the GPRS station is not attached, the application performs a GPRS attach. The GPRS attach is preferably performed in accordance with standard procedure, see for example Draft ETSI EN 301 344 V6.4.0 (1999-08), chapter 6.2. The GPRS application then checks if the GPRS station  20  has a valid IP-address (i.e., if it has a working TCP/IP connection). If not, the application requests the GSM/GPRS network  10  to activate a packet data service to be used by the GPRS station  20 , i.e., it initiates the performance of a GPRS PDP Context Activation. The GPRS application then either receives a dynamically allocated IP-address from the GSM/GPRS network  10  or from a Radius server (not shown) via the GSM/GPRS network. The GPRS PDP Context Activation and the transfer of a dynamic IP-address are preferably performed in accordance with standard procedure, see for example TS 101 348 V6.3.0 (1998-10), chapter 11.2.1.2. Of course, the GPRS application could alternatively already have a static IP address allocated to it when initiating the GPRS PDP Context Activation. The application of the GPRS station  20  then initiates establishment of a TCP/IP connection towards the IP-address and the port number received in the SMS message. The IP address and the port number designates the server  50  and a server application wishing to push packet data. Alternatively, when establishing the connection, the push server  50  is identified using the server host name received from the DNS server  40 .  
         [0051]    6. In step  6  the push server  50  recognizes that a TCP/IP connection has been set up from the GPRS station  20  to which it earlier initiated the transmission of an SMS message in order to accomplish the now established connection. This recognition is based on information which the GPRS station  20  has included in the response message, e.g., the MSISDN of the GPRS station  20  or a request code originally generated and included in the SMS message previously transmitted by the server  50 . The push server  50  responds by first transmitting the same originator identification code which it earlier transmitted in the SMS message to the GPRS station. This will enable the GPRS station to verify that the push server  50  to which a TCP/IP connection now is established is the same server as that which transmitted the original SMS message triggering the set-up of the connection. After transmission of the identification code the push server  50  start transmitting packet data with information to the GPRS station  20 .  
         [0052]    In FIG. 2 a flow chart of the operation of a wireless communication station/GPRS mobile station and its included executing application is shown.  
         [0053]    In step S 1  the mobile user enters the IP address of the DNS server  40 , which is stored in a memory  22  of the GPRS station  20  for later retrieval by an application executing in the GPRS station. Alternatively, this step S 1  relates to the actual loading of the application in the GPRS mobile station, which application already includes the IP address of the DNS server  40 .  
         [0054]    In step S 2  the application of the GPRS station receives an SMS message from which payload it extracts an IP address, port number and an originator identification code. The application then in step S 3  establishes a TCP/IP connection with the DNS server using the pre-stored IP address. It then in step S 4  transmits the IP address received in the SMS message and requests the DNS server to perform an address translation. In response to the request, the application in step S 5  receives a host name from the DNS server.  
         [0055]    In step S 6  the received host name is displayed on the display  26  for the user of the GPRS station. It then in step S 7  waits for a response from the user via the keypad  27 . If the application receives a rejection, the execution returns to step S 2 . If a confirmation is received, the execution continues to step S 8 .  
         [0056]    In step S 8  the application establishes a TCP/IP connection with the originator of the IP address received in the SMS message, i.e., with the push server  50 . It then once again receives an originator identification code from the push server, this time in step S 9  over the TCP/IP connection, which code in step S 10  is matched against the identification code previously received in the SMS message. If no match is found, the execution returns to step S 2 . If a match is found, the execution continues to step S 11 , in which step packet data transmissions are accepted and received from the push server.  
         [0057]    Although the invention has been described with reference to a specific exemplifying embodiment based on a GSM system providing a GPRS service, many different alterations, modifications and the like will become apparent for those skilled in the art. The described embodiments are therefore not intended to limit the scope of the invention, as defined by the appended claims. Instead, it is to be understood that the present invention is well suited for any wireless communication network that provides a packet data service to its connected wireless users.