Method for transferring data upon request using permanent identifier

<u style="single">Field Of The Invention</u>

0001The present invention relates to the field of communication and more particularly, a method for transferring data upon request using a permanent identifier..

<u style="single">Description Of Related Art</u>

0002<figref idref="f0001">Fig. 1</figref> illustrates a logical block diagram of a conventional communication system that provides mobility. This logical block diagram represents either wireless or wireline (or landline) communication systems that provide subscriber mobility. As shown, an end user 2 communicates with a destination entity 6 via a first communication device 4, a serving system 12, a network 14, a home system 16, and a second communication device 8. The end user 2 represents an entity (human, system or machine) which generates information for communication to the destination entity 6 (also a human, system or machine).

0003The first communication device 4 represents a device for interfacing with the serving system 12. For instance, taking wireless communication as an example, the serving system 12 includes any number of base stations, mobile switching centers, authentication centers, etc. to provide wireless communication services for a coverage area in which the communication device 4 is located, and the communication device 4 represents a mobile station. Continuing with the wireless communication example, the network 14 presents a public or private communication network such as the Public Switch Telephone Network, a public packet network or a private packet network, and the home system 16 represents the wireless communication service provider with whom the user of the mobile station (i.e., the communication device 4) has established an agreement to provide mobile wireless communication services. Accordingly, the home system 16, like the serving system 12, also includes any number of base stations, mobile switching centers, authentication centers, etc. to provide mobile wireless communication services for a coverage area. Because a particular mobile wireless communication service provider has a limited coverage area, service providers having different coverage areas establish roaming agreements to serve each other's customers. In this example, the second communication device 8 could be a mobile station or wireline connection to the home system 16. Alternatively, in this example or any other embodiment, the second communication device 8 is connected to the home system 16 via a network such as the network 14. As a further alternative, the second communication device 8 forms part of the home system 16.

0004As an example of how <figref idref="f0001">Fig. 1</figref> represents a wireline mobile communication system, the serving system 12 represents the landline mobile communication service provider for the location in which the communication device 4 is located, the network 14 represents, for example, a long distance landline carrier, and the home system 16 represents another landline mobile communication service provider with whom the end user 2 has established an agreement to provide landline mobile communication services. The first communication device 4 could then represent an intelligent or programmable phone. One embodiment of an intelligent phone allows the end user 2 to place a programmed integrated circuit card into the intelligent phone, and convert the intelligent phone into the end user's personal phone. Namely, the programmed integrated circuit card provides the intelligent phone with the subscriber information for the end user 2 such that communication of this information to the serving system 12 and communication between the serving system 12 and the home system 16 allows, for example, (1) calls to the end user 2 to be routed to the intelligent phone (i.e., communication device 4) or (2) the end user 2 to originate calls in the serving system 12 as if he were still in the area served by the home system 16.

0005The wireline and wireless examples given above provide only two examples of the many possible mobile communication systems represented by <figref idref="f0001">Fig. 1</figref>.

0006The mobile communication systems represented by the logical block diagram of <figref idref="f0001">Fig. 1</figref> present various challenges to the serving system 12 and the home system 16 which want to provide communication services only to valid users and receive appropriate payment for having provided those services. Accordingly, each communication system has associated therewith numerous different standards and protocols for ensuring that the above mentioned goals are achieved.

0007The most prevalent techniques employed by these standards utilize permanent identifiers associated with the end user 2. One of the identifiers is assigned by the home system 16, and is referred to hereinafter as the first permanent identifier. The first permanent identifier includes two portions. The first portion includes routing information to the home system 16, and identifies the home system 16 with which the serving system 12 should communicate. The second portion of the first permanent identifier identifies the end user 2 to the home system 16, and is often an identification number. Many wireless communication standards refer to the first permanent identifier as the mobile station identifier (MSID).

0008An example of the first permanent identifier is the International Mobile Station (or Subscriber) Identification (IMSI) specified by the International Telecommunication Union - Telecommunication Sector (ITU-T) Recommendation E.212. The format of the IMSI is given below: <maths id="math0001"><math display="block"><mi mathvariant="normal">I</mi><mo>⁢</mo><mi mathvariant="normal">M</mi><mo>⁢</mo><mi mathvariant="normal">S</mi><mo>⁢</mo><mi mathvariant="normal">I</mi><mfenced><mi mathvariant="normal">u</mi><mo>⁢</mo><mi mathvariant="normal">p</mi><mspace width="1em" /><mi mathvariant="normal">t</mi><mo>⁢</mo><mi mathvariant="normal">o</mi><mspace width="1em" /><mn>15</mn><mspace width="1em" /><mi mathvariant="normal">d</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">g</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">t</mi><mo>⁢</mo><mi mathvariant="normal">s</mi></mfenced><mo>=</mo><mi mathvariant="normal">M</mi><mo>⁢</mo><mi mathvariant="normal">C</mi><mo>⁢</mo><mi mathvariant="normal">C</mi><mfenced><mn>3</mn><mspace width="1em" /><mi mathvariant="normal">d</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">g</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi>ts</mi></mfenced><mo>+</mo><mi mathvariant="normal">M</mi><mo>⁢</mo><mi mathvariant="normal">N</mi><mo>⁢</mo><mi mathvariant="normal">C</mi><mfenced><mn>1</mn><mspace width="1em" /><mi mathvariant="normal">t</mi><mo>⁢</mo><mi mathvariant="normal">o</mi><mspace width="1em" /><mn>3</mn><mspace width="1em" /><mi mathvariant="normal">d</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">g</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi>ts</mi></mfenced><mo>+</mo><mi mathvariant="normal">M</mi><mo>⁢</mo><mi mathvariant="normal">S</mi><mo>⁢</mo><mi mathvariant="normal">I</mi><mo>⁢</mo><mi mathvariant="normal">N</mi><mo>⁢</mo><mfenced><mn>9</mn><mo>-</mo><mn>11</mn><mspace width="1em" /><mi mathvariant="normal">d</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">g</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">t</mi><mo>⁢</mo><mi mathvariant="normal">s</mi></mfenced></math><img file="EP1069795B1_D0001.tif" /></maths>

0009The mobile country code (MCC) forms the first three digits of the IMSI and identifies the country in which the home system 16 is located. Together with the mobile network code (MNC), which forms the next 1 to 3 digits, the MCC forms a home system code identifying the home system 16. Communication standards in the United States often refer to this home system code as the home network identifier (HNI). The next 9-11 digits form the identification number pre-assigned to the end user 2 by the home system 16.

0010Another permanent user identifier (hereinafter "the second permanent identifier"), while known by the home system 16 and associated with the end user 2, is not necessarily assigned by the home system 16. This identifier is also associated in some manner with the first communication device 4 or a portion thereof being used by the end user 2. In a mobile wireless communication system, the second permanent identifier could be the electronic serial number (ESN) of the mobile station serving as the first communication device 4. In a wireline mobile communication system such as the intelligent phone example discussed above, the second permanent identifier could be the serial number of the programmed integrated circuit card. The second permanent identifier could even be the phone number of, for example, and integrated services digital network (ISDN) phone.

0011The home system 16 typically stores the first and second permanent identifier pair for each subscriber such as the end user 2. When communicating with the serving system 12, the communication device 4 supplies the first and second permanent identifiers to the serving system 12. Based on the routing information in the first permanent identifier, the serving system 12 knows to communicate with the home system 16 to, for example, validate the end user 2. To validate the end user 2, the serving system 12 provides one or both of the first and second permanent identifiers to the home system 16. Typically, if the home system 16 receives only one of these identifiers, the home system 16 will request the other identifier from the serving system 12.

0012If both the first and second permanent identifiers provided by the serving system 12 match a corresponding first and second permanent identifier pair stored at the home station 16, the home station 16 validates the end user 2. This process may be used as part of a procedure to verify (for billing purposes) or authenticate (to eliminate fraud) the end user 2 as well. Referring again to the wireless example, this validation process is typically performed as part of the registration procedure included in most wireless communication standards.

0013Once validated, the serving system 12 provides communication services to the end user 2. For example, in a wireless system, a serving system 12 will open a traffic channel to a valid mobile station upon receiving such a request from the mobile station by the end user 2 originating the call. Having opened this traffic channel, the end user 2 can now transmit data to the destination entity 6.

0014A need, however, exists for end users to more efficiently transmit data than available through the lengthy process of requesting and establishing a traffic channel.

0015Both <patcit id="pcit0001" dnum="US5544225A"><text>U.S. Patent No. 5,544,225</text></patcit> and <patcit id="pcit0002" dnum="WO9806227A"><text>WO 98/06227</text></patcit> disclose a method of data messaging in a communications network. According to <patcit id="pcit0003" dnum="US5544225A"><text>U.S. Patent No. 5,544,225</text></patcit> and <patcit id="pcit0004" dnum="WO9806227A"><text>WO 98/06227</text></patcit>, a block 118 creates a data message (<figref idref="f0002">Figure 4</figref> of both <patcit id="pcit0005" dnum="US5544225A"><text>U.S. Patent No. 5,544,225</text></patcit> and <patcit id="pcit0006" dnum="WO9806227A"><text>WO 98/06227</text></patcit>). This data message may be either created immediately or stored for later transmission by messaging unit 16 (<figref idref="f0001">Figure 1</figref> of both <patcit id="pcit0007" dnum="US5544225A"><text>U.S. Patent No. 5,544,225</text></patcit> and <patcit id="pcit0008" dnum="WO9806227A"><text>WO 98/06227</text></patcit>).

0016<patcit id="pcit0009" dnum="US5544225A"><text>U.S. Patent No. 5,544,225</text></patcit> and <patcit id="pcit0010" dnum="WO9806227A"><text>WO 98/06227</text></patcit> send data over a communications network by altering the MIN and keeping the ESN as an identifier, or altering the ESN and keeping the MIN as an identifier.

0017<patcit id="pcit0011" dnum="US5729537A"><text>U.S. Patent No. 5,729,537</text></patcit> is directed to a method and apparatus for providing anonymous data transfer in a communication system. A review of <patcit id="pcit0012" dnum="US5729537A"><text>U.S. Patent No. 5,729,537</text></patcit> indicates that <patcit id="pcit0013" dnum="US5729537A"><text>U.S. Patent No. 5,729,537</text></patcit> is directed exclusively to methods of allowing a mobile station to anonymously access a communication network without identifying the mobile station with a permanent identifier which uniquely identifies the mobile station.

<i><u style="single">SUMMARY OF THE INVENTION</u></i>

0018A method of transferring data and a method of requesting a transfer of data according to the present invention are set out in the independent claims, to which the reader is now referred. Preferred features are laid out in the dependent claims.

0019The method for transferring data according to the present invention sends data as part of a first type of permanent identifier associated with an end user in a communication system. The first type of permanent identifier is sent along with a second type of permanent identifier, also associated with the end user, during a communication procedure prior to establishing a traffic channel in the communication system. Besides the data, the permanent identifier of the first type includes routing information to a home system forming part of the communication system. The end user also stores the sent permanent identifier of the first type, and in response to receiving the stored permanent identifier of the first type in a communication, will generate a new permanent identifier of the first type.

0020Based on a received permanent identifier of the second type, a home system can recognize the end user associated with a received permanent identifier of the first type and the received permanent identifier second type. At least in accordance with this recognition, the home system sends at least the permanent identifier of the first type to a destination entity (human, system or machine). The destination entity stores the permanent identifier of the first type, and extracts the data therein. When the destination entity wants the end user to send more data, the destination entity sends the permanent identifier of the first type to the end user as a request. In this manner, the destination entity controls the receipt of data.

<i><u style="single">DETAILED DESCRIPTION OF THE DRAWINGS</u></i>

0021The present invention will become more fully understood from the detailed description given below and the accompanying drawings which are given by way of illustration only, wherein like reference numerals designate corresponding parts in the various drawings, and wherein: <ul id="ul0001" list-style="none"><li><figref idref="f0001">Fig. 1</figref> illustrates a logical block diagram of a conventional communication system;</li><li><figref idref="f0001">Fig. 2</figref> illustrates a logical block diagram of a system embodiment for the end user in <figref idref="f0001">Fig. 1</figref>;</li><li><figref idref="f0001">Fig. 3</figref> illustrates a logical block diagram of a system embodiment of the destination entity in <figref idref="f0001">Fig. 1</figref>; and</li><li><figref idref="f0002">Fig. 4</figref> illustrates a logical block diagram of an embodiment of a communication system according to the present invention.</li></ul>

<u style="single">Detailed Description Of The Preferred Embodiments</u>

0022The method of transferring data will be described using the conventional communication system illustrated in <figref idref="f0001">Fig. 1</figref>. Accordingly, a description of the elements illustrated in <figref idref="f0001">Fig. 1</figref> will not be repeated.

0023As discussed above, the numerous standards and protocols associated with the many mobile communication systems represented by <figref idref="f0001">Fig. 1</figref> employ a first permanent identifier and a second permanent identifier. To transmit data, the communication device 4 initiates a procedure within the standard or protocol that requires the transfer of the first and second permanent identifiers. For example, in a mobile wireless communication system, many standards require that the mobile station transmit the first and second permanent identifiers as part of the registration procedure.

0024However, the communication device 4 modifies the first permanent identifier prior to transmission. Alternatively, the end user 2 supplies the communication device with a modified first permanent identifier. Specifically, the first portion of the first permanent identifier contains the routing information to the home system 16, but the second portion or a part thereof, which normally includes the user identification number pre-assigned by the home system 16, includes data from the end user 2.

0025The second permanent identifier remains unchanged. Consequently, the first permanent identifier will be referred to as the variable identifier, and the second permanent identifier will be referred to as the fixed identifier.

0026For instance, when the IMSI is the variable identifier, the modified IMSI has the format given below: <maths id="math0002"><math display="block"><mi mathvariant="normal">I</mi><mo>⁢</mo><mi mathvariant="normal">M</mi><mo>⁢</mo><mi mathvariant="normal">S</mi><mo>⁢</mo><mi mathvariant="normal">I</mi><mfenced><mi mathvariant="normal">u</mi><mo>⁢</mo><mi mathvariant="normal">p</mi><mspace width="1em" /><mi mathvariant="normal">t</mi><mo>⁢</mo><mi mathvariant="normal">o</mi><mspace width="1em" /><mn>15</mn><mspace width="1em" /><mi mathvariant="normal">d</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">g</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">t</mi><mo>⁢</mo><mi mathvariant="normal">s</mi></mfenced><mo>=</mo><mi mathvariant="normal">M</mi><mo>⁢</mo><mi mathvariant="normal">C</mi><mo>⁢</mo><mi mathvariant="normal">C</mi><mfenced><mn>3</mn><mspace width="1em" /><mi mathvariant="normal">d</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">g</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi>ts</mi></mfenced><mo>+</mo><mi mathvariant="normal">M</mi><mo>⁢</mo><mi mathvariant="normal">N</mi><mo>⁢</mo><mi mathvariant="normal">C</mi><mfenced><mn>1</mn><mspace width="1em" /><mi mathvariant="normal">t</mi><mo>⁢</mo><mi mathvariant="normal">o</mi><mspace width="1em" /><mn>3</mn><mspace width="1em" /><mi mathvariant="normal">d</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">g</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi>ts</mi></mfenced><mo>+</mo><mi mathvariant="normal">d</mi><mo>⁢</mo><mi mathvariant="normal">a</mi><mo>⁢</mo><mi mathvariant="normal">t</mi><mo>⁢</mo><mi mathvariant="normal">a</mi><mo>⁢</mo><mfenced><mn>9</mn><mo>-</mo><mn>11</mn><mspace width="1em" /><mi mathvariant="normal">d</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">g</mi><mo>⁢</mo><mi mathvariant="normal">i</mi><mo>⁢</mo><mi mathvariant="normal">t</mi><mo>⁢</mo><mi mathvariant="normal">s</mi></mfenced></math><img file="EP1069795B1_D0002.tif" /></maths>

0027As part of the initiated procedure, the serving system 12 supplies the variable and fixed identifiers to the home system 16 via the network 14 and the second communication device 8. If the serving system 12 only supplies one of the variable and fixed identifiers, the home system 16 requests the other identifier. The home system 16 compares the variable and fixed identifiers to stored variable and fixed identifier pairs. If the home system 16 finds a match between the received fixed identifier and a stored fixed identifier, but the received variable identifier does not match the stored variable identifier associated with the matching stored fixed identifier, then the home system 16 recognizes that the received variable identifier stores data. When the home system 16 recognizes that the received variable identifier stores data, the home system 16 sends the received variable and fixed identifiers to the destination entity 6 associated with the matching stored fixed identifier via the second communication device 8. The home system 16 also fails to validate the first communication device 4 for the serving system 12. As a result, the serving system 12 has the option to deny service to the first communication device 4.

0028Based on the received fixed identifier, the destination entity 6 recognizes that the received fixed and variable identifiers originated from the end user 2. Furthermore, because the variable identifier does not match the variable identifier for the end user 2, the destination entity 6 recognizes the variable identifier as containing data. Alternatively, simply receiving the identifiers from the home system 16 causes a recognition that the variable identifier contains data. The destination entity 6 having recognized that the variable identifier contains data extracts the second portion of the variable identifier as data.

0029As one skilled in the art will appreciate, the method according to the present invention allows an end user 2 to transfer data to a destination entity without having to request and establish a traffic channel.

0030As discussed previously, the end user 2 can be a human, system or machine. For instance, the end user 2 may be an end user system as shown in <figref idref="f0001">Fig. 2. Fig. 2</figref> illustrates a logical block diagram of an end user system 100. As shown, an end user system 100 includes a first central processing unit (CPU) 102 connected to a first read-only memory (104) and a first random access memory (106). The first CPU 102 performs some function in accordance with received input based on a predetermined program stored in the first ROM 104. Intermediate and final processing results are stored in the first RAM 106. According to the programming stored in the first ROM 104, the first CPU 102 transfers data to the communication device 2 for transmission.

0031As one skilled in the art will appreciate, the end user system 100 could be any of a plurality of end user systems, such as an automated teller machine, a sensing or measuring device (e.g., gas or electric meter), a vending machine, a vehicle, an autonomous vehicle, a robot, a security alarm system, an environmental or weather tracking system, etc., which receive input in some fashion, such as from a human or sensor(s). Consequently, a need exists for the end user system 100 to transfer data accumulated in the processing of its function to a remotely located destination entity 6 associated therewith.

0032As a more specific example, the end user system 100 could be a vehicle tracking device measuring the distance traveled by the vehicle and detecting the location of the vehicle. By means of the first communication device 4, the serving system 12, the network 14, the home system 16 and the second communication device 8, the end user system 100 transfers data on distance and location to the destination entity 6 according to the method of the present invention.

0033In an alternative embodiment, the first communication device 4 forms a part of the end user system 100 or the end user system 100 forms a part of the first communication device 4. In a possible mobile wireless communication system, the first communication device 4 is a mobile station, and the mobile station forms part of the end user system 100.

0034As also discussed previously, the destination, entity 6 could be a human, system or machine. For instance, the destination entity 6 may be the processing system 110 shown in <figref idref="f0001">Fig. 3</figref>. As shown, the processing system 110 includes a second CPU 112 connected to a second ROM 114 and a second RAM 116. The second CPU 112 performs processing functions in accordance with a predetermined program stored in the second ROM 114, and stores intermediate and final processing results in the second RAM 116.

0035Continuing with the vehicle tracking example, the processing system 110 is a processing system for a transport company that extracts the data transferred thereto by the end user system 100, and uses the extracted data to, for example, prepare appropriate billing of the customer.

0036As an alternative, the second communication device 8 could form part of the destination entity 6, or the destination entity 6 could form part of the second communication device 8.

0037Furthermore, the home system 16 could communicate directly with the destination entity 6 via a communication line (e.g., fiber optic, cable, etc.); thus, eliminating the second communication device 8. The second communication device 8 could also be eliminated in another alternative embodiment wherein the destination entity 6 forms part of the home system 16 or the home system 16 forms part of the destination entity 6.

0038As a further alternative, and preferably as part of the embodiment wherein the destination entity 6 forms a part of the home system 16 or the home system 16 forms a part of the destination entity 6, the home system 16 does not store any variable identifiers. Instead, the home system 16 does not expect to ever validate the end user 2 so that communication services can be provided thereto. The home system 16 expects only to receive data from the end user 2. Accordingly, when the home system 16 receives a fixed identifier from the serving system 12 that matches a stored fixed identifier, the home system 16 sends the variable and fixed identifiers to the destination entity 6.

0039<figref idref="f0002">Fig. 4</figref> illustrates another logical block diagram of a mobile communication system according to the present invention. The embodiment of <figref idref="f0002">Fig. 4</figref> is the same as that shown in <figref idref="f0001">Fig. 1</figref> except for the addition of (1) third - Mth communication devices 8-1,..., 8-M connected to the home system 16 and (2) second - Nth destination entities 6-1, ..., 6-N connected to the third - Mth communication devices 8-1,..., 8-M.

0040In this embodiment, the home system 16 supports multiple destination entities 6, 6-1, ..., 6-N. The home system 16 stores a unique address for each of the first - Nth destination entities 6, 6-1, ..., 6-N. Accordingly, to properly direct data to one of the first - Nth destination entities 6, 6-1, ..., 6-N the end user 2 or communication device 4 creates the second portion of the variable identifier such that a predetermined part thereof includes the unique address of the intended destination entity recipient. The remaining parts of the second portion of the variable identifier are then available for sending data.

0041For example, assume ten or less destination entities are supported by the home system 16 such that a single digit could be used to uniquely identify the destination entities. Also assume for the purposes of this example that the variable identifier is the IMSI. Then, the modified IMSI could have the format given below:

0042IMSI(up to 15 digits)=MCC(3 digits)+MNC(1-3 digits)+unique destination entity identifier or address(1 digit)+data(8-10 digits).

0043While in this example, the unique destination entity identifier is shown as forming the first part of the second portion of the variable identifier, the unique destination entity may form any part of the second portion of the variable identifier.

0044When handling a received fixed and variable identifier pair wherein the received fixed identifier matches a fixed identifier stored at the home system 16, the home system 16 obtains the destination entity identifier in the predetermined part of the second portion of the variable identifier. The home system 16 then sends the fixed and variable identifiers to the destination entity 6, 6-1, ...,6-N identified by the destination entity identifier.

0045As an alternative, the second communication devices 8, 8-1, ..., 8-M could form part of the destination entities 6, 6-1, ..., 6-N or the destination entities 6, 6-1, ..., 6-N could form part of the second communication devices 8, 8-1, ..., 8-M.

0046Furthermore, the home system 16 could communicate directly with one or more of the destination entities 6, 6-1, ..., 6-N via a communication line (e.g., fiber optic, cable, etc.); thus, eliminating one or more of the second communication devices 8, 8-1, ..., 8-M. The second communication devices 8, 8-1, ..., 8-M could also be eliminated in another alternative embodiment wherein the destination entities 6, 6-1, ..., 6-N form part of the home system 16.

0047Another operational embodiment of the present invention will now be described with respect to <figref idref="f0001">Fig. 1</figref>. This operational embodiment allows the destination entity 6 to request the end user 2 to send data. When the end user 2 and communication device 4 are set-up, the communication device 4 sends an initial variable identifier and fixed identifier under the control of the end user 2. The variable identifier can include data as discussed previously. Alternatively, the variable identifier includes dummy data (i.e., data identifiable as fake data). As a further alternative, the variable identifier includes a predetermined code as the data. The predetermined code identifies the variable identifier as an initially sent variable identifier. The end user 2 also stores the sent variable identifier.

0048In the manner discussed above, the variable identifier and the fixed identifier are sent to the destination entity 6, and the destination entity 6 extracts the data in the variable identifier. If the data is recognized as dummy data or the predetermined code, the destination entity 6 recognizes the variable identifier as an initially sent variable identifier from the end user 2.

0049The destination entity 6 also stores the variable identifier. When the destination entity 6 wants the end user 2 to send data, the destination entity 6 instructs the second communication device 8 to send the variable identifier stored at the destination entity 6 to the end user 2 along with a request to re-send the variable identifier. For example, in a wireless system where the communication device 4 is a mobile station, the request to re-send the variable identifier is a request sent by the home system 16 for the mobile station to re-register.

0050When the end user 2 receives a request to re-send the variable identifier, the end user 2 determines whether the variable identifier received with the request matches the variable identifier stored by the end user 2. If a match is found, the end user 2 generates a new variable identifier in the manner discussed previously, and sends the new variable identifier and the fixed identifier to the destination entity 6.

0051The end user 2 will then save the new variable identifier, preferably, replacing the previously stored variable identifier to reduce required memory capacity. Upon receipt of the new variable identifier, the destination entity 6 will, likewise, save the new variable identifier, preferably, replacing the variable identifier previously stored by the destination entity.

0052The next time the destination entity 6 wants to request data, the newly stored variable identifier will be sent with the request. Operation then repeats in this manner. Accordingly, the destination entity 6 may request the sending of data from the end user 2 on an event or periodic basis. Namely, in response to an event, such as operator input at the destination entity 6, a request for data is sent, or at a predefined interval, the destination entity 6 sends the request for data.

0053This operational embodiment of the present invention provides the destination entity 6 with a measure of control over the receipt of data, and eliminates some of the destination entity's dependence on the end user 2 regarding the receipt of data.

0054Furthermore, while this embodiment of the present invention has been described with respect to the single destination entity communication system of <figref idref="f0001">Fig. 1</figref>, it will be readily appreciated from the foregoing disclosure, that this embodiment is also applicable to the multiple destination entity communication system of <figref idref="f0002">Fig. 4</figref>.

0055While most of the examples given with respect to the present invention have been of wireless mobile communication systems, one skilled in the art will recognize from the foregoing disclosure that the present invention also applies to wireline mobile communication systems.