WO2006086952A1 - Systeme de communication, procede d'utilisation d'un systeme de communication, reseau de communication et procede d'utilisation d'un reseau de communication - Google Patents

Systeme de communication, procede d'utilisation d'un systeme de communication, reseau de communication et procede d'utilisation d'un reseau de communication Download PDF

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Publication number
WO2006086952A1
WO2006086952A1 PCT/DE2006/000249 DE2006000249W WO2006086952A1 WO 2006086952 A1 WO2006086952 A1 WO 2006086952A1 DE 2006000249 W DE2006000249 W DE 2006000249W WO 2006086952 A1 WO2006086952 A1 WO 2006086952A1
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Prior art keywords
communication
network
communication service
service server
communication system
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PCT/DE2006/000249
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German (de)
English (en)
Inventor
Maik Bienas
Achim Luft
Holger Schmidt
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Infineon Technologies Ag
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Publication of WO2006086952A1 publication Critical patent/WO2006086952A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0407—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the identity of one or more communicating identities is hidden
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00—Network arrangements, protocols or services for addressing or naming
    • H04L61/45—Network directories; Name-to-address mapping
    • H04L61/4505—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols
    • H04L61/4511—Network directories; Name-to-address mapping using standardised directories; using standardised directory access protocols using domain name system [DNS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
    • H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/02—Inter-networking arrangements

Definitions

  • a communication system a method of operating a communication system, a communication network, and a method of operating a communication network
  • the invention relates to a communication system, a method for operating a communication system, a communication network and a method for operating a communication network.
  • GSM Global System of Mobile Communications
  • a UMTS communication system that is, a UMTS standard communication system, provides users with various circuit-switched services and packet-switched services, and will be available in the near future among others in much of Europe.
  • WLANs WLANs
  • WLANs are specially designed for the radio transmission of packet-switched services.
  • WLANs enable data transmission with higher data rates compared to UMTS communication systems, but do not allow the mobility of users to the extent that UMTS communication systems allow.
  • WLANs are specified, for example, by the IEEE 802.11 standard and the HIPERLAN or HIPERLAN / 2 standard.
  • Future (mobile) subscriber devices are expected to be set up to use not only second-generation mobile radio communication systems but also UMTS communication systems and WLAN, that is,
  • a user of a subscriber device uses a packet-switched communication service by means of a communication connection to a UMTS communication system and, during the communication connection is moved into the coverage area of a WLAN radio cell, that is to say into the geographical area in which a WLAN can be used by means of the subscriber device.
  • the communication connection using the UMTS communication system remains.
  • the communication connection to the UMTS communication system would be terminated and not be continued by means of a communication connection to a WLAN, even if the user is in a WLAN radio cell located.
  • the use of the communication service would have to be interrupted because a change of the communication system by means of which the communication service is used is currently not possible without interruption.
  • a communication system change from the UMTS communication system to the WLAN is required, so that always a communication connection to the WLAN or a There is a communication connection to the UMTS communication system.
  • the degree of cooperation between UMTS communication systems and WLAN was divided into ⁇ stages and 6 scenarios were defined, which are referred to as Scenario 1 to Scenario 6. According to Scenario 1, there is the least degree of cooperation, and according to Scenario 6, there is the greatest degree of cooperation. From Scenario 4, that is, according to Scenario 4, Scenario 5 and Scenario 6, there is the possibility of an inter-system handover, that is, a communication system change between UMTS communication systems and WLANs (see [1], Chapter 6.5).
  • FIG. 1 shows a UMTS communication system 100 for providing packet-switched services.
  • a subscriber device 101 is coupled to a UMTS mobile network 103 by means of a first base station 102, which is referred to as NodeB in the UMTS standard.
  • the first base station 102 is the radio interface between the user equipment 101 and the UMTS mobile radio network 103 and enables the transmission of radio signals.
  • the first base station 102 is coupled to a Radio Network Controller (RNC) 104.
  • RNC Radio Network Controller
  • the RNC 104 essentially has tasks related to the control of the air interface, such as the allocation of radio resources in a communication connection setup.
  • a second base station 110 There may be further base stations coupled to the RNC 104, here for example a second base station 110.
  • IP Internet Protocol
  • a SGSN (Serving GPRS Support Node) 105 couples the subscriber device 101 to the UMTS mobile radio network 103 and provides the functionality of a router.
  • the SGSN 105 is still used for
  • the UMTS mobile radio network 103 is coupled to external packet-based communication networks, here for example the Internet 107.
  • the GGSN 106 also provides the functionality of a router.
  • the GGSN is further coupled to an IMS (IP Multimedia Subsystem) 108, that is, a communication system according to the IMS standard.
  • IMS IP Multimedia Subsystem
  • An IMS is a packet-based communication system.
  • the IMS standard has been developed to offer services that are typical of circuit-switched transmission, such as voice telephony.
  • An HLR (Home Location Register) 109 contains data required to establish a communication connection and to authenticate the user of the user equipment 101.
  • the UMTS communication system 100 may include further GGSNs (not shown). In this way, through redundancy, a higher reliability and above all availability can be achieved and data traffic can be distributed over several network elements. Demands that
  • the GGSN 106 or one of the other GGSN is selected by a DNS (Domain Name Service) server.
  • DNS Domain Name Service
  • the subscriber device 101 requests a communication service by sending a PDP context request to the SGSN 105.
  • the PDP Context Request optionally contains an APN (Access Point Name).
  • An APN is a non-unique reference to a GGSN and always has an identification specifying the communication service requested by the user equipment 101.
  • the APN may include an operator identification (Operator ID) specifying a communication network by which the communication service is to be used.
  • Operator ID an operator identification
  • the operator identification is optionally included in the APN. If no operator identification is included in the APN, then the communication service of the current communication network, in this case the UMTS radio network 103, provided.
  • the SGSN 105 To determine an IP address of a GGSN corresponding to the APN, the SGSN 105 sends a request to a
  • the DNS server contains a mapping table by means of which an IP address can be assigned to the APN. However, this assignment is not unique.
  • the DNS server transmits to the SGSN 105 the IP address of any GGSN that can provide the requested communication service. This is the GGSN 106 shown in this example.
  • Robin method used i. at each request for the provision of the communication service, the next GGSN is selected in a list of the GGSNs suitable for the communication service.
  • the APN has the form myIMS.mncO12.mcc345.grps.
  • the string myIMS is the required communication service identification and the string mncO12, mcc345 is the optional operator identification (network identification).
  • the label gprs indicates that the APN is used in the context of a communication network according to the 3GPP standard.
  • FIG. 2 shows a communication system 200 with a WLAN access network 203.
  • a subscriber device 201 is coupled to the WLAN access network 203 by means of a first access point (AP) 202.
  • the first access point 202 serves as a radio interface and enables the transmission of radio signals.
  • the access router 205 is responsible for controlling handovers between the connected access points 202, 204 and couples the subscriber device 201 to the Internet 206 and an AAA server (Authentication, Authorization and Accounting Server) 207.
  • AAA server Authentication, Authorization and Accounting Server
  • the Access Router 205 provides the functionality of a router.
  • the AAA server 207 is used to authenticate and verify the authority of the users. Further, the AAA server 207 generates the data used for detecting communication connection charges.
  • FIG. 3 shows a communication system 300 with a WLAN / 3G interworking network 310.
  • the WLAN / 3G interworking network 310 is configured according to the 3GPP standard for Scenario 3.
  • the WLAN / 3G interworking network 310 couples a UMTS mobile network 311 having the network architecture discussed with reference to FIG. 1 to a WLAN access network 312, which has the network architecture explained with reference to FIG.
  • the UMTS mobile radio network 311 has base stations 302, 303 which are connected by means of an RNC
  • SGSN 305 is coupled to an SGSN 305, a GGSN 306 coupled to the SGSN 305, the Internet 307, an IMS 308, and an HLR 309.
  • the WLAN access network 312 comprises access points 313, 314 and an access router 316 as described with reference to FIG.
  • a subscriber device 315 is coupled to the access router 316 via one of the access points 313, 314.
  • the communication system 300 allows the access of the
  • Subscriber device 315 by means of the WLAN access network 312 on packet-switched (communication) services, which are provided by means of the UMTS communication network 311, for example, access to the IMS 308th
  • AAA server 316 of the WLAN / 3G interworking network 310 If the user of the subscriber device 315 wishes to use these services, authentication and authorization by means of an AAA server 316 of the WLAN / 3G interworking network 310 is required.
  • An AAA server which the WLAN access network 312 may have, can not be used for this.
  • a PDG (Packet Data Gateway) 317 provides access to the Internet 307 and IMS 308 and provides the functionality of a router. For detecting communication connection charges, the AAA server 316 is coupled to the PDG 317.
  • a WAG (WLAN Access Gateway) 318 has, in essence, the task of providing a communication connection to the home UMTS communication network (not shown) of a user of a subscriber device (not shown) if there is a communication connection from the subscriber device to the UMTS mobile radio network 311 and this is a visited UMTS communication network and not the user's home UMTS communication network.
  • the WAG 318 has a communication connection to the PDG of the home UMTS communication network (not shown).
  • the WAG 318 provides the functionality of a router.
  • roaming The possibility of communicating with the home UMTS communication network by means of a visited UMTS communication network is called roaming.
  • a user of the subscriber device 315 wishes to use a communication service by means of the WLAN access network 312, the selection of a PDG and the determination of the IP address of the selected PDG are similar to the case of a UMTS mobile radio network, as explained above with reference to FIG ,
  • the subscriber device 315 contacts a DNS server which converts a W-APN (WLAN Access Point Name) into the IP address of a PDG suitable for providing the communication service, ie the IP address of a suitable PDG, for example the PDG 317 shown, transmitted to the subscriber device 315.
  • W-APN WLAN Access Point Name
  • the user equipment 315 itself requests an IP address at a DNS server and not an intervening network element such as the SGSN 305 in the case of a UMTS mobile network.
  • the subscriber device 315 receives the IP address of the selected PDG 317 directly.
  • the user equipment 315 directly contacts the PDG 317 using the IP address.
  • the WAG 318 is transparent to the subscriber device.
  • the common network element has different interfaces to the SGSN 315 (illustratively to the UMTS side) and to the WAG 318 (illustratively to the WLAN side) as well as to further communication systems, for example the Internet 307.
  • WLAN interworking according to 3GPP is described in [2].
  • GPRS according to 3GPP is described in [3].
  • Document [4] describes a communication system with a WLAN and a UMTS communication network, in which a communication terminal sends a request with the specification of an access point name of a communication service server to a Domain Name Service server in order to transmit the
  • the invention is based on the problem of providing a method for an inter-system handover between a UMTS communication network and a WLAN, in which the security of the UMTS communication network is ensured.
  • the problem is solved by a communication system, a method for operating a communication system, a communication network and a method for operating a communication network having the features according to the independent patent claims.
  • a communication system having a communication terminal and a communication network, wherein the communication network has a
  • Communication service server that is configured to provide a communication service.
  • the communication terminal is set up to transmit a request for the provision of the communication service to the communication network.
  • Communication network has an allocation device that is configured to map the network layer address of the communication service server to a unique identification of the communication service server and a signaling device that is configured to transmit the identification to the communication terminal.
  • the communication terminal is configured to request using the identification that the communication service server provides the communication service for the communication terminal.
  • the communication network clearly communicates the identification of the communication terminal to the communication terminal Communication service servers with it
  • Communication terminal allows to address the communication service server and to submit a request for the provision of the communication service to the communication service server without the communication terminal the network layer address of the communication service server is known (the request can be done indirectly, that is by means of a another network element to which the identification of the communication service server is notified by the communication terminal).
  • Communication service terminal are kept secret. Details about the network topology of the communication network are thus kept secret from the user of the communication terminal, thereby increasing the network security of the communication network.
  • the communication network has a UMTS (Universal Mobile Telecommunication System) communication network and a WLAN (Wireless Local Area Network), it becomes the communication terminal, for example a mobile subscriber unit, in the case of an inter-system handover from the UMTS Communication network to the WLAN allows the communication service server, such as a GGSN (GPRS Support GPRS General Packet Radio Service) to address, which is particularly advantageous if the GGSN is combined with a PDG (Packet Data Gateway) to a network element, since in this case the mobile subscriber unit in the course of the inter-system handover the PDG can address.
  • GGSN GPRS Support GPRS General Packet Radio Service
  • PDG Packet Data Gateway
  • the mobile subscriber device thus makes it possible to uniquely refer to the GGSN without the mobile subscriber device being informed of details about the network topology of the communication network.
  • APN Access Point Name
  • SGSN Serving GPRS Support Node
  • DNS Domain Name Service
  • the mobile subscriber unit remains hidden the IP address of the GGSN and the mobile subscriber unit, it is not possible to contact the DNS server itself and so dissolve the identification in an IP address.
  • the mobile radio subscriber device can determine in the course of an inter-system handover a W-APN (WLAN Access Point Name), which uniquely references the PDG, which is combined with the GGSN to form a network element.
  • W-APN WLAN Access Point Name
  • the GGSN provides a communication connection to the Internet for the mobile radio subscriber unit as a communication service
  • the PDG which is combined with the GGSN to form a GGSN / PDG
  • the PDG which is combined with the GGSN to form a GGSN / PDG
  • the communication service after an inter-system handover.
  • a fast inter-System handovers are performed (without interrupting the communication service), since the external network layer address, ie the network layer address that is used to address the network element that provides the Koinmunikationsdienst, ie the GGSN / PDG, from the Internet, in History of inter-system handover does not change.
  • the redirection of the data transmitted in the context of the communication service can be done by simply switching to GGSN / PDG.
  • Network elements are implemented, which would result in delays in the continuation of the communication service using the WLAN in the context of an inter-system handover.
  • the communication network has a first access network and a second access network
  • the request is a request for the provision of the communication service by means of the first access network
  • the signaling device is set up, the identification to the communication terminal as a result of the request of the communication terminal to the communication terminal to convey.
  • the communication terminal is configured to request using the identification that the communication service server provides the communication service for the communication terminal via the second access network.
  • the invention is illustratively used in the context of an inter-system handover from the first access network (for example a UMTS communication network) to the second access network (for example a WLAN).
  • first access network for example a UMTS communication network
  • second access network for example a WLAN
  • the first access network is a
  • the communication service server GGSN and / or the signaling device SGSN.
  • the second access network is a WLAN.
  • the unique identifier is an APN.
  • the allocation device is a DNS server.
  • the communication service is providing a communication connection to another communication system.
  • the communication connection is a packet-switched communication connection.
  • the other communication system can be the Internet.
  • a GGSN as a communication service provides a communication link from a mobile radio subscriber device to the Internet, which should exist seamlessly (without interruption) as part of an inter-system handover, that is to say by means of the access network to which the inter-system handover takes place. should be continued without interruption.
  • the network layer address is an IP address of the communications service server by means of which the communications service server is addressable within the communications network.
  • the invention is particularly suitable as part of an inter-system handover of a UMTS mobile network to a WLAN.
  • FIG. 1 shows a UMTS cortiming system for
  • Figure 2 shows a communication system with a WLAN access network
  • Figure 3 shows communication system with a WLAN / 3G interworking network
  • Figure 4 shows a communication system according to an embodiment of the invention.
  • FIG. 5 shows a message flow diagram according to FIG.
  • FIG. 4 shows a communication system 400 according to an embodiment of the invention.
  • the architecture of the communication system 400 is based on the architecture of a WLAN / 3G interworking network according to
  • a UMTS mobile radio network 401 has base stations 402, 403 coupled to an SGSN 405 by a Radio Network Controller (RNC) 404, an IMS (IP Multimedia Subsystem) 406, an HLR (Home Location Register) 407, an AAA (Authentication , Authorization and Accounting Server) - Server 409 and a WAG (WLAN Access Gateway) 408, each with the functionality described with reference to Fig.l and Fig.3.
  • RNC Radio Network Controller
  • IMS IP Multimedia Subsystem
  • HLR Home Location Register
  • AAA Authentication , Authorization and Accounting Server
  • WAG WLAN Access Gateway
  • the communication system further includes a user equipment 415.
  • the UMTS mobile radio network 401 has a PDG / GGSN 411 instead of a GGSN and a PDG.
  • the PDG / GGSN 411 provides the functionality of a GGSN and the functionality of a PDG.
  • the PDG / GGSN 411 By means of the PDG / GGSN 411, the SGSN 405, the IMS 406, the HLR 407, the AAA server 409, the WAG 408 and the Internet 412 are coupled together.
  • the mobile subscriber device 415 is provided with a UMTS transmitter and a UMTS receiver and with a WLAN transmitter and WLAN
  • Receiver that is, the user equipment 415 can communicate with both the UMTS mobile network 401 and the WLAN 410.
  • the UMTS transmitter of the user equipment 415, the UMTS receiver of the user equipment 415, the WLAN transmitter of the user equipment 415 and the WLAN receiver of the user equipment 415 can be operated simultaneously.
  • a handover is always understood to mean an inter-system handover.
  • the following describes how the user equipment 415 requests a communication service provided by the UMTS communication system 401 and how to perform an inter-system handover so that the communication service is no longer disconnected from the UMTS mobile network 401 without interruption is provided to the WLAN 410, that is, by means of the WLAN 410 is continued.
  • FIG. 5 shows a message flow diagram 500 according to an embodiment of the invention.
  • the illustrated message flow occurs between a user equipment 501, an SGSN 502, a first Domain Name Service (DNS) server 503, an HLR 504, a GGSN / PDG 505, a second DNS server 506, and an AAA server 507.
  • DNS Domain Name Service
  • the user equipment 501, the SGSN 502, the HLR 504, the GGSN / PDG 505 and the AAA server 507 are arranged and configured as explained with reference to FIG.
  • a GGSN 550 and a PDG 551 are combined to the GGSN / PDG 505.
  • the subscriber device 501 transmits a PDP Context Request message 536 to the SGSN 502.
  • the PDP context request message 536 specifies a PDP context requested by the user equipment 501.
  • a first APN is specified, which in this example has the form Internet@mncO12.mcc345.gprs.
  • step 509 the SGSN 502 checks, based on the user device's internal policies and user profile of the subscriber device 501 stored in the HLR 504, whether the user is authorized to use the requested PDP context. Clearly, an authorization is carried out.
  • step 510 if the PDP context is authorized, the SGSN 502 requests a resolution of the first APN at the first DNS server 503, i. sends a first APN resolution request 537 to the first DNS server 503, requesting that the first DNS server 503 send the IP address of a GGSN that can provide a communication link to the Internet for the subscriber device 501 to the SGSN 502 is transmitted.
  • the first DNS server 503 correspondingly transmits a first IP address 538 to the SGSN 502.
  • the first IP address has the form 134.219.233.86.
  • the first IP address is the IP address of a GGSN that can provide a communication link to the Internet 412 for the subscriber device 501. It is believed that this is the GGSN 550.
  • the first IP address 538 is thus the UMTS-side IP address of the GGSN / PDG 505, ie the IP address of the GGSN / PDG 505, by means of which the GGSN / PDG 505 within the UMTS mobile radio network 401 is addressed.
  • the association between the first APN and the first IP address 538 is not unique.
  • the first DNS server 503 could also select the IP address of a GGSN other than that of the GGSN 550.
  • step 512 the SGSN 502 queries the first DNS server 503 for a unique name (unique identifier) of the GGSN 550.
  • the first DNS server 503 responds to the request of the SGSN 502 and transmits a second APN uniquely assigned to the first IP address.
  • the second APN in this example is GGSN7325@mnc012.mcc345.gprs.
  • step 514 the SGSN 502 acknowledges the request of the PDP context by means of a first PDP Context ACK message 539 containing the second APN.
  • step 515 the communication link between the Internet 412 and the user equipment 501 is established.
  • Subscriber device 501 now sends payload data to SGSN 502, which forwards the payload data to GGSN / PDG 505, which has the functionality of a gateway to Internet 412.
  • the GGSN / PDG 505 receives payload data for the
  • the GGSN / PDG 505 is within the Internet by means of a second IP address (in this example, this is the IP address 86.245.12.63) addressed.
  • the data received from the GGSN / PDG 505 from the Internet 412 is forwarded from the GGSN / PDG 505 to the SGSN 502 and ultimately forwarded by it to the subscriber device 501.
  • the logical co-communication connection between the user equipment 501 and the GGSN / PDG 505 is made by means of the PDP context requested in step 508.
  • Subscriber device 501 in step 516 in a WLAN radio cell of the WLAN 410 moves. Since a higher bandwidth can be provided by means of the WLAN 410 than by means of the UMTS mobile radio network 401, it is assumed that the user of the subscriber device 501 wishes to continue the communication connection to the Internet by means of the WLAN 410, that is, the communication connection to the Internet from now on be provided by means of a radio communication link from the subscriber device 501 to the WLAN 410.
  • the user equipment 501 first authenticates in the WLAN 410 (this is done in a conventional manner and will not be described in detail) and a wireless communication link is established from the user equipment 501 to the WLAN 410.
  • step 517 the user equipment 501 sends a second APN resolution request 544 to the second DNS server 506 by which it requests the resolution of the second APN.
  • the second DNS server 506 transmits the IP address of the PDG combined with the GGSN specified by the second APN to a GGSN / PDG, that is, the IP address of the PDG 551, to the user equipment 501.
  • the IP address of the PDG 551 is 134.219.73.42.
  • the user equipment 501 sets up a tunnel to the PDG 551. This is done using the IP address of the PDG 551 (134.219.73.42).
  • the subscriber device 501 transmits an APN request message 541 to the PDG 551.
  • the APN request message 541 specifies an APN request, the third APN used for this purpose being used as service ID (communication service). Identification) includes the identification of the communication service desired by the user of the user equipment 501 (in this case a communication connection to the Internet 412).
  • the APN request message is further signaled that the desired communication service is already provided by means of the UMTS mobile radio network 401 and is now to be provided by means of the WLAN 410, i. to be continued by means of the WLAN 410.
  • the third APN used for the APN request also has (eg at the end) the second APN.
  • the third APN thus has, for example, the form Internet / HO: GGSN7325@mnc072.mcc345. gprs.
  • the signaling of the second APN by means of the third APN enables the PDG 551 to check whether it is actually the PDG that is merged with the GGSN into a GGSN / PDG that provides the communication service so far via the UMTS mobile network 401.
  • step 521 the PDG 551 checks by asking the AAA server 507 if the APN request from step 520 is authorized.
  • the PDG 551 confirms to the subscriber device 501 the use of the desired communication service.
  • step 523 after successful authorization in the GGSN / PDG 505, the routing of the data received from the Internet 412 for the subscriber device 501 from the GGSN / PDG is switched from the GGSN 550 to the PDG 551.
  • step 524 the data received from the Internet 412 by the GGSN / PDG 505 and intended for the subscriber device 501 are forwarded by the PDG 551 to the subscriber device 501 by means of the WLAN 410.
  • the switching from the GGSN 550 to the PDG 551 for the data coming from the Internet can be performed without delay because the GGSN 550 and the PDG 551 are merged to the GGSN / PDG 505 to a physical device and not other network elements via the switching of the routing must be informed.
  • the data coming from the Internet 412 destined for the user equipment 501 is sent to the same IP address since the GGSN / PDG 505 and thus the GGSN 550 and the PDG 551 are sent by means of a single IP address (the IP address 86.245. 12.63) within the Internet.
  • step 525 the remaining PDP context (which is associated with the first APN Internet@mncO12.mcc345.gprs) is degraded because the user equipment 501 is now the communication service by means of the WLAN 410 (corresponding to the third APN Internet / HO: GGSN7325 @ mncO12 .mcc345. gprs).
  • the user equipment 501 sends a PDP Release Request message 542 to the SGSN 502, which confirms the removal of the PDP context by means of a Release ACK message 543 in step 526. It is assumed that the user with his user equipment 501 moves out of the coverage area of WLAN 410 in step 527.
  • the communication service ie the communication connection to the Internet 412) is to be provided again by means of the UMTS mobile radio network 401.
  • step 528 the user equipment 501 sends a second PDP context request message 543 to the SGSN 502, signaling the third APN to the SGSN 502.
  • step 529 an authorization of the requested PDP context is performed in step 529.
  • step 530 analogously to step 510, the SGSN 502 transmits a third APN resolution request 544 to the first DNS server 503 containing the third APN.
  • the first DNS server 503 in response transmits the first IP address 538, which is the IP address of the GGSN 550 within the UMTS mobile network 401 ,
  • the SGSN 502 contacts the GGSN 550 and, in step 532, transmits a second PDP context ACK message 539 to the user equipment 501 as confirmation of the establishment of the requested PDP context.
  • step 533 the communication service is now provided again by means of the UMTS mobile radio network 401. Since it is no longer necessary for the communication service to be provided by means of WLAN 410, in step 534, the user equipment 501 sends an APN removal request message 540 to the GGSN / PDG 505, which terminates the provision of the communication service via the WLAN 410 and transmit an APN Release ACK message 541 to the subscriber device 501 for confirmation.
  • WLAN Wireless Local Area Network

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Hardware Design (AREA)
  • Computing Systems (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un système de communication comportant un terminal de communication et un réseau de communication présentant un dispositif d'affectation conçu pour reproduire l'adresse de couche de transmission d'un serveur de service de communication sur une identification univoque du serveur de service de communication, et transmettre celle-ci au terminal de communication. De cette manière, l'adresse de couche de transmission d'un serveur de service de communication peut être cachée à un terminal de communication.
PCT/DE2006/000249 2005-02-17 2006-02-13 Systeme de communication, procede d'utilisation d'un systeme de communication, reseau de communication et procede d'utilisation d'un reseau de communication WO2006086952A1 (fr)

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DE102005007339A DE102005007339A1 (de) 2005-02-17 2005-02-17 Kommunikationssystem, Verfahren zum Betreiben eines Kommunikationssystems, Kommunikationsnetzwerk und Verfahren zum Betreiben eines Kommunikationsnetzwerks
DE102005007339.5 2005-02-17

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WO2006086952A1 true WO2006086952A1 (fr) 2006-08-24

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WO2011050685A1 (fr) * 2009-10-28 2011-05-05 华为技术有限公司 Procédé, appareil et système pour configurer ou interroger une passerelle de desserte
US9344960B2 (en) 2008-05-09 2016-05-17 Telefonaktiebolaget L M Ericsson (Publ) Systems and methods for selecting a gateway general packet radio service (GPRS) support node

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US9344960B2 (en) 2008-05-09 2016-05-17 Telefonaktiebolaget L M Ericsson (Publ) Systems and methods for selecting a gateway general packet radio service (GPRS) support node
CN107105472A (zh) * 2008-05-09 2017-08-29 爱立信电话股份有限公司 选择网关通用分组无线电服务（gprs）支持节点的系统和方法
CN107105472B (zh) * 2008-05-09 2021-04-27 爱立信电话股份有限公司 选择网关通用分组无线电服务（gprs）支持节点的系统和方法
WO2011050685A1 (fr) * 2009-10-28 2011-05-05 华为技术有限公司 Procédé, appareil et système pour configurer ou interroger une passerelle de desserte

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