WO2006063330A2 - Interworking of cellular networks and wireless lans - Google Patents

Interworking of cellular networks and wireless lans Download PDF

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Publication number
WO2006063330A2
WO2006063330A2 PCT/US2005/044872 US2005044872W WO2006063330A2 WO 2006063330 A2 WO2006063330 A2 WO 2006063330A2 US 2005044872 W US2005044872 W US 2005044872W WO 2006063330 A2 WO2006063330 A2 WO 2006063330A2
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WIPO (PCT)
Prior art keywords
pdg
wlan
handover
cellular network
wtru
Prior art date
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Ceased
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PCT/US2005/044872
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English (en)
French (fr)
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WO2006063330A3 (en
Inventor
Kamel M. Shaheen
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InterDigital Technology Corp
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InterDigital Technology Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to CN2005800424012A priority Critical patent/CN101142830B/zh
Priority to ES05853721T priority patent/ES2433932T3/es
Priority to JP2007545703A priority patent/JP4934593B2/ja
Priority to CA002589768A priority patent/CA2589768A1/en
Priority to MX2007006869A priority patent/MX2007006869A/es
Priority to HK08105552.1A priority patent/HK1111039B/xx
Priority to AU2005314406A priority patent/AU2005314406B2/en
Priority to EP05853721.8A priority patent/EP1825696B1/en
Priority to BRPI0517160-1A priority patent/BRPI0517160A/pt
Application filed by InterDigital Technology Corp filed Critical InterDigital Technology Corp
Publication of WO2006063330A2 publication Critical patent/WO2006063330A2/en
Publication of WO2006063330A3 publication Critical patent/WO2006063330A3/en
Priority to IL183452A priority patent/IL183452A/en
Anticipated expiration legal-status Critical
Priority to NO20073556A priority patent/NO340066B1/no
Priority to AU2009201928A priority patent/AU2009201928B2/en
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0022—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies
    • H04W36/00224—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB]
    • H04W36/00226—Control or signalling for completing the hand-off for data sessions of end-to-end connection for transferring data sessions between adjacent core network technologies between packet switched [PS] and circuit switched [CS] network technologies, e.g. circuit switched fallback [CSFB] wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/10—Small scale networks; Flat hierarchical networks
    • H04W84/12—WLAN [Wireless Local Area Networks]
    • 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

  • the present invention is related to wireless communication systems. More specifically, the present invention is a method and system for interworking between cellular networks and wireless local area networks
  • WLANs Wireless Local Area Networks
  • a multi-mode wireless transmit/receive unit supports wireless communication in more than one wireless communication network.
  • WTRU wireless transmit/receive unit
  • a wireless subscriber may roam between a WLAN and a third generation (3G) network while maintaining continuity in the wireless service provided to the user. Therefore, there is a need for coordination between the WTRU and the networks such that the service continuity is maintained as the user roams between different wireless networks.
  • the present invention is related to a method and system for interworking between cellular networks and WLANs.
  • At least one cellular network, at least one WLAN and an IP network are deployed.
  • the WLAN includes an access point (AP).
  • the cellular network includes a radio access network and a core network.
  • the radio access network includes a Node-B and a radio network controller, and the core network includes a packet data gateway (PDG), a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN).
  • PDG packet data gateway
  • SGSN serving GPRS support node
  • GGSN gateway GPRS support node
  • a WTRU first establishes a connection to a WLAN and a tunnel between an AP and a PDG is established.
  • the PDG further establishes a tunnel to an IP network.
  • the WTRU then invokes a service which is delivered through the WLAN.
  • a new connection to the cellular network may be established either before or after breaking the current connection to the WLAN or the two connections may be maintained simultaneously.
  • Figure 1 is a block diagram of a UMTS-WLAN architecture
  • Figure 2 is a signaling diagram of a process for access to 3G based services through a WLAN
  • Figure 3 is a signaling diagram of a process for interworking in accordance with a first embodiment of the present invention
  • Figure 4 is a signaling diagram of an alternative process for interworking in accordance with an alternative to the first embodiment of the present invention
  • Figure 5 is a signaling diagram of a process for interworking in accordance with a second embodiment of the present invention.
  • Figure 6 is a signaling diagram of an alternative process for interworking in accordance with an alternative to the second embodiment of the present invention.
  • Figure 7 is a signaling diagram of a process for interworking in accordance with a third embodiment of the present invention.
  • the terminology 11 WTRU includes but is not limited to a user equipment, a mobile station, a fixed or mobile subscriber unit, a pager, or any other type of device capable of operating in a wireless environment.
  • the terminology "Node- B” and "AP” includes but is not limited to a base station, a site controller or any other type of interfacing device in a wireless environment.
  • the present invention provides methods for maintaining service continuity and seamless handover between a WLAN and a cellular network by defining steps for establishing the cellular network connectivity, steps for performing a handover, and steps for breaking the connectivity between the user and the WLAN.
  • the cellular network can be any type of cellular network including, but not limited to, a universal mobile telecommunication system (UMTS), cdma2000 and a global system for mobile communication (GSM), and the WLAN can be any type of WLAN including, but not limited to, an IEEE 802.x network.
  • FIG. 1 is a block diagram of a UMTS-WLAN interworking network 100.
  • WLANs 130a, 130b (e.g., WLAN hot spots), are deployed in the coverage area of the UMTS 110.
  • Each WLAN 130a, 130b includes at least one AP 132a, 132b for radio access.
  • the AP 132a, 132b is connected to an access router (AR) 134 for access to external networks, such as an IP network 140, (e.g., Internet), or a cellular core network 120 for 3G-based services through the WLAN hotspot.
  • AR access router
  • Base stations 112 are deployed in the UMTS coverage area for access to UMTS networks.
  • the base station 112 is connected to a radio network controller (RNC) 114 which is connected to the cellular core network 120.
  • RNC radio network controller
  • the cellular core network 120 comprises a circuit switched core network (not shown) and a packet switched core network (shown in Figure 1).
  • the packet switched core network 120 comprises an SGSN 122, an authentication, authorization and accounting (AAA) server 124, a home location register (HLR)/home subscriber server (HSS) 126, a GGSN 128, a PDG 129 and a WLAN access gateway (WAG) 121.
  • a WTRU 102 is currently in a service area of the WLAN hotspot 130a.
  • the WTRU 102 acquires system information of the WLAN hotspot 130a through active or passive scanning (step 202).
  • the WTRU 102 In active scanning, the WTRU 102 sends a probe request to the AP 132a and the AP 132a sends a probe response in response to the probe request (steps 202a, 202b).
  • the WTRU 102 may receive beacons from more than one AP. In such case the WTRU typically selects the AP having the strongest signal.
  • the WTRU 102 listens to the beacon transmitted from the AP 132a periodically (step 202c).
  • WLAN association and authentication procedures are performed.
  • the WTRU 102 sends an association request message to the selected AP 132a (step 204) and the AP 132a sends an association response message to the WTRU 102 (step 206). At such point, an association is established and WLAN authentication procedure is performed (step 208).
  • the WTRU 102 then initiates subscription and service authentication procedures by registering with the UMTS network for receiving UMTS-based services through the WLAN 130a (step 210).
  • the WLAN 130a resolves the Network Access Id (NAI) provided by the WTRU 102.
  • NAI Network Access Id
  • the AR 134 uses the NAI to route AAA messages to the relevant AAA server 124 in the UMTS core network 120.
  • the AR 134 triggers extensible authentication protocol (EAP)-authentication key agreement (AKA) authentication and relay messages to a UMTS AAA server 124.
  • EAP extensible authentication protocol
  • AKA authentication key agreement
  • the WTRU 102 uses dynamic host configuration protocol (DHCP) to receive an IP address and then initiates a tunnel establishment with the PDG 129 through the WAG 121.
  • DHCP dynamic host configuration protocol
  • the WTRU 102 constructs a fully qualified domain name (FQDN) and performs a domain name service (DNS) query for the PDG 129 from a DNS 142 (step 212).
  • DNS domain name service
  • the WTRU 102 selects a PDG from the received list in the DNS query response and establishes an end-to-end tunnel between the selected PDG 129 and the WTRU 102 (step 214).
  • Figure 3 is a signaling diagram of a process 300 for interworking in accordance with, the first embodiment of the present invention.
  • a new connection to the UMTS network is established before breaking the current connection to the WLAN hotspot, (i.e., "make before break")-
  • the WTRU indicates an application, such as voice over IP (VoIP) services, and the tunnel is set up for this certain application.
  • VoIP voice over IP
  • the tunnel is established by the WTRU 102 sending a request to the AP 132a (step 302a) and the AP 132a forwarding the request to the PDG 129 (step 302b).
  • the WTRU 102 invokes the indicated service (step 302).
  • a request is sent to the PDG 129 to establish the connection to the IP Multimedia Subsystem (IMS) 150 and allocate the Proxy Call State Control Function (P-CSCF) or the Session Initiation Protocol (SIP) proxy for the WTRU 102.
  • P-CSCF Proxy Call State Control Function
  • SIP Session Initiation Protocol
  • the first option is preferred since it will save additional delay in setting up the call.
  • the second option may be the implementation in certain situations.
  • the step 304 between the PDG 129 and the IMS 150 indicates the steps taking place to establish the connection between the PDG 129 and the IMS 150, such as SIP registration, allocation of P-CSCF and the allocation of Serving CSCF (S-CSCF).
  • a CSCF is a specific type of SIP server, which is used to process SIP signaling packets in an IMS network.
  • a P-CSCF is an SIP proxy that is the first point of contact for the WTRU.
  • An S-CSCF is a central node of the signaling plane. [0030] As the WTRU 102 moves away from the current WLAN hotspot
  • the WTRU 102 establishes a connection to the GGSN 128 as indicated by arrow 305 by the following steps 306-310.
  • the WTRU 102 first establishes a radio access bearer (RAB) to a Node-B 112 (step 306) and invokes a 3GPP system attachment (step 308).
  • the WTRU 102 then invokes 3GPP IP connectivity by establishing a packet data protocol (PDP) context (step 310).
  • RAB radio access bearer
  • PDP packet data protocol
  • the WTRU 102 When the WTRU 102 sets up a PDP context, the WTRU 102 selects an access point and an access point name (APN) is determined. The APN is used in a DNS query. This process finally gives an IP address of the GGSN 128 which serves the access point. The WTRU 102 then invokes 3GPP IMS connectivity through SIP registration at step 312 at such point the connection between the GGSN 128 and the IMS 150 is also established as indicated by arrow 312a.
  • APN access point name
  • the WTRU 102 sends a handover request to the AP 132a (step 314).
  • the handover request identifies the tunnel end points, the user ID, radio resources, frequency channels, priority, or the like.
  • the AP 132a then sends a 3GPP relocation request to the PDG 129 (step 316).
  • the PDG 129 may be removed from the call path after the connectivity to the WLAN 130a is terminated or the PDG 129 may remain on the call path after the connectivity to the WLAN 130a is terminated.
  • Figure 3 illustrates the first option and the second option will be explained with reference to Figure 4 hereinafter.
  • the PDG 129 is removed from the call path after the connectivity to the WLAN 130a is terminated.
  • the PDG 129 forwards the request to the GGSN 128, and the GGSN 128 forwards the request to the IMS 150 (steps 318, 320).
  • the tunnel between the PDG 129 and the GGSN 128 lasts only for the duration the connectivity to the WLAN 130a exists, and then a new connection between the GGSN 128 and the IMS 150 is established and traffic is forwarded directly from the IMS 150 to the GGSN 128 where the WTRU 102 is now connected.
  • the IMS 150 sends a relocation response to the GGSN 128, which forwards the response to the PDG 129 (steps 322, 324).
  • the PDG 129 sends a relocation response to the AP 132a (step 326).
  • the AP 132a then releases the resources after sending a handover complete message to the WTRU 102 (step 328).
  • the GGSN 128 also sends the handover complete message, (i.e., HO complete), for resource allocation to the Node-B 112 via the SGSN 122 (steps 330, 332).
  • the Node-B 112 then sends the handover complete message to the WTRU 102 (step 334).
  • the services from the IMS 150 are then provided through the UMTS network 110, (i.e., from the IMS 150 via the GGSN 128, the SGSN 122 and the Node-B 112 to the WTRU 102 as indicated by arrows 336a-336c) (steps 336, 338).
  • FIG 4 is a signaling diagram of an alternative process 400 to the first embodiment.
  • Process 400 is similar to process 300 except the PDG 129 remains on the call path after the connectivity to the WLAN 140a is terminated.
  • the PDG 129 will be in the middle of the call path after the handover.
  • the handover is performed by switching the signaling path in the P-CSCF toward the GGSN 128 from the PDG 129.
  • the traffic is directed from the PDG 129 to the GGSN 128.
  • Steps 402-416 are the same as corresponding steps 302-316 and will not be repeated herein.
  • the PDG 129 After receiving the relocation request from the AP 132a, the PDG 129 sends a tunnel establishment request to the GGSN 128 and the GGSN 128 responds with a tunnel establishment response. At such point a tunnel is established between the PDG 129 and the GGSN 128.
  • the GGSN 128 establishes the SIP connectivity to the IMS 150 through the PDG 129 (steps 422, 424).
  • the PDG 129 sends a relocation response to the AP 132a (step 426).
  • the AP 132a then releases the resources after sending a handover complete message to the WTRU 102 (step 428).
  • the GGSN 128 also sends the handover complete message for resource allocation to the Node-B 112 via the SGSN 122 (steps 430, 432).
  • the Node-B 112 then sends the handover complete message to the WTRU 102 (step 434).
  • the services from the IMS 150 are then provided through the UMTS network 110, (i.e., from the IMS 150 via the PDG 129, the GGSN 128, the SGSN 122 and the Node-B 112 to the WTRU 102 as indicated by arrows 436a-436c) (step 436).
  • Figure 5 is a signaling diagram of a process 500 for interworking in accordance with a second embodiment of the present invention.
  • the WTRU 102 may maintain multiple sessions simultaneously and the existing connectivity to the WLAN 130a is not torn down after the handover is complete. Two connections are maintained simultaneously and the application is transferred from one network to the other, (i.e., "simultaneous").
  • the WTRU 102 invokes a service, such as VoIP call services (step 502).
  • the WTRU 102 sends a request to the AP 132a (step 502a) and the AP 132a forwards the request to the PDG 129 (step 502b).
  • the step 504 between the PDG 129 and the IMS 150 indicates the steps taken place to establish the connection between the PDG 129 and the IMS 150, such as SIP registration, allocation of P-CSCF and the allocation of S-CSCF.
  • the WTRU 102 establishes an additional connection to the
  • the WTRU 102 establishes a connection to the GGSN 128 as indicated by arrow 505 by the following steps 506-510.
  • the WTRU 102 establishes an RAB to a Node-B 112 (step 506) and invokes a 3GPP system attachment (step 508).
  • the WTRU 102 then invokes 3GPP IP connectivity by establishing a PDP context (step 510).
  • the WTRU 102 sets up a PDP context, the WTRU 102 selects an access point and an APN is determined.
  • the APN is used in a DNS query. This process finally gives an IP address of the GGSN 128 which serves the access point.
  • the WTRU 102 then invokes 3GPP IMS connectivity through SIP registration at step 512 at such point the connection between the GGSN 128 and the IMS 150 is also established as indicated by arrow 512a.
  • the application is transferred from the WLAN 130a to the UMTS network 110 without breaking the existing connection to the WLAN 130a.
  • the WTRU 102 sends a handover request to the AP 132a (step 514).
  • the handover request identifies the tunnel end points, the user ID, radio resources, frequency channels, priority, or the like.
  • the AP 132a then sends a 3GPP relocation request to the PDG 129 (step 516).
  • the PDG 129 may be removed from the call path after the connection is switched to the UMTS or may remain on the call path.
  • Figure 5 illustrates the first option and the second option will be explained with reference to Figure 6 hereinafter. [0041]
  • the PDG 129 forwards the request to the GGSN 128, and the
  • GGSN 128 forwards the request to the IMS 150 (steps 518, 520).
  • the PDG 129 is removed from the call path after the connectivity to the WLAN 130 a is switched.
  • the tunnel between the PDG 129 and the GGSN 128 lasts only for a certain interval, and a new connection between the GGSN 128 and the IMS 150 is established and traffic is forwarded directly from the IMS 150 to the GGSN 128 where the WTRU 102 is connected.
  • the IMS 150 sends a relocation response to the GGSN 128, which forwards the response to the PDG 129 (steps 522, 524).
  • the PDG 129 sends a relocation response to the AP 132a (step 526).
  • the AP 132a then releases the resources after sending a handover complete message to the WTRU 102 (step 528).
  • the GGSN 128 also sends the handover complete message for resource allocation to the Node-B 112 via the SGSN 122 (steps 530, 532).
  • the Node-B 112 then sends the handover complete message to the WTRU 102 (step 534).
  • FIG. 6 is a signaling diagram of a process 600 which is an alternative to the second embodiment of the present invention.
  • Process 600 is similar to process 500 except the PDG 129 remains on the call path after the connectivity to the WLAN 130a is switched. The PDG 129 will be in the middle of the call path after the handover.
  • Steps 602-616 are the same as corresponding steps 502-516 of process 500 and will not be repeated herein.
  • the PDG 129 After receiving the relocation request from the AP 132a, the PDG 129 sends a tunnel establishment request to the GGSN 128 and the GGSN 128 responds with a tunnel establishment response (steps 618, 620). At such point a tunnel is established between the PDG 129 and the GGSN 128.
  • the GGSN 128 establishes the SIP connectivity to the IMS 150 through the PDG 129 (steps 622, 624).
  • the PDG 129 sends a relocation response to the AP 132a (step 626).
  • the AP 132a then releases the resources at step 629 after sending a handover complete message to the WTRU 102 (step 628).
  • the GGSN 128 also sends the handover complete message for resource allocation to the Node-B 112 via the SGSN 122 (steps 630, 632).
  • the Node-B 112 then sends the handover complete message to the WTRU 102 (step 634).
  • the services from the IMS 150 are then provided through the UMTS network, (i.e., from the IMS 150 via the PDG 129, the GGSN 128, the SGSN 122 and the Node-B 112 to the WTRU 102 as indicated by arrows 636a-636c) (step 636).
  • FIG. 7 is a signaling diagram of a process 700 for interworking in accordance with a third embodiment of the present invention.
  • the existing connectivity to the WLAN 130a is torn down before handover to the UMTS network 110, (i.e., "break before make”).
  • the WTRU 102 invokes the indicated service (step 702).
  • the WTRU 102 sends a request to the AP 132a (step 702a) and the AP 132a forwards the request to the PDG 129 (step 702b).
  • the step 704 between the PDG 129 and the IMS 150 indicates the steps taken place to establish the connection between the PDG and the IMS, such as SIP registration, allocation of P-CSCF and the allocation of S-CSCF.
  • the WTRU 102 moves away from the current WLAN hotspot 130a, as shown in Figure 1, handover from the current WLAN hotspot 130a to the UMTS network 110 is performed.
  • a new connectivity to the UMTS network 110 is established after breaking the existing connectivity to the current WLAN hotspot 130a, (e.g., loss of signal).
  • the WTRU may initiate the handover to the UMTS system or alternatively the WLAN may initiate the handover. Since the WLAN is connected to the PDG 129, the WLAN may initiate the handover to the target UMTS system.
  • the AP 132a sends a message, (a relocation request), to the PDG 129 (step 708). The session is then maintained for a certain interval (step 710).
  • the WTRU 102 then establishes a connection to the GGSN 128 as indicated by arrow 711 by the following steps 712-716.
  • the WTRU 102 establishes an RAB to a Node-B 112 (step 712) and invokes a 3GPP system attachment (step 714).
  • the WTRU 102 then invokes 3GPP IP connectivity by establishing a PDP context (step 716).
  • the WTRU 102 sets up a PDP context, the WTRU 102 selects an access point and an APN is determined. The APN is used in a DNS query. This process finally gives an IP address of the GGSN 128 which serves the access point.
  • the WTRU 102 then invokes 3GPP IMS connectivity through SIP registration at step 718, at such point the connection between the GGSN 128 and the IMS 150 is also established as indicated by arrow 718a.
  • a handover bending session is then initiated (step 720).
  • the WTRU 102 sends the information related to the existing session to the IMS 150, (i.e., SIP server).
  • the information includes the session/service identification, originating and terminating IP addresses, a request to redirect the traffic to the UMTS system with the new contact information, (i.e., current IP address), or the like.
  • the IMS 150 then updates the new routing of the call/session.
  • the IMS 150 establishes a new P-CSCF and S-CSCF for the new session.
  • the IMS 150 then sends a handover request notification to the
  • PDG 129 with information regarding the session and indications that the call/session has been redirected and resources previously reserved should be released (step 722).
  • the PDG 129 then sends a relocation response to the AP 132a along with the session information and WTRU identity (step 724).
  • the AP 132a then releases resources allocated for the WTRU 102.
  • the session is resumed between the WTRU 102 and the IMS 150 (steps 726a-726d) and user invoked services are provided from the IMS 150 via the GGSN 128, the SGSN 122 and the Node-B 112 to the WTRU 102 (step 728).
  • the PDG 129 may indicate a handover to the IMS 150.
  • the WTRU 102 may indicate the handover to the IMS 150 and provide the old connection information.
  • [0053] A method for interworking between a cellular network and a WLAN for a user service provided by an IMS, whereby the user service is continuously provided through the cellular network after the handover.
  • WTRU initially establishes a connection to a WLAN and establishes a tunnel between the WLAN and a PDG of the cellular network and, in turn, a tunnel between the PDG and an IP network to receive a user service through the
  • the WTRU establishes a connection to the cellular network and performs a handover from the WLAN to the cellular network by sending a handover signaling through the WLAN.
  • connection to the WLAN is terminated after the connection to the cellular network is established.
  • connection to the WLAN and the connection to the cellular network are maintained simultaneously.
  • a WTRU establishes a connection to a WLAN and a tunnel between the WLAN and a PDG and, in turn, a tunnel between the PDG and an IP network to receive a user service through the WLAN.
  • the WTRU establishes a connection to the cellular network when the connection to the WTRU is broken and initiates a handover bending session to recover the session and performs a handover from the
  • WLAN to the cellular network.
  • a system for interworking between the cellular network and the WLAN for a user service provided by the IMS whereby the WTRU continuously receives the user service through the cellular network after handover by establishing a connection to the cellular network.
  • the cellular network comprises a radio access network and a core network which includes a PDG, a SGSN and a GGSN.
  • the WLAN is configured to establish a tunnel between the WLAN and the PDG and the PDG is configured to establish a tunnel between the PDG and the IMS.
  • the WTRU is configured to communicate with both the WLAN and the cellular network and to perform a handover from the WLAN to the cellular network by sending a handover signaling through the WLAN.
  • connection to the WLAN is terminated after the connection to the cellular network is established.
  • connection to the WLAN and the connection to the cellular network are maintained simultaneously.
  • the cellular network comprises a radio access network and a core network which includes a PDG, a SGSN and a GGSN.
  • the WLAN is configured to establish a tunnel between the WLAN and the PDG of the cellular network and the PDG is configured to establish a tunnel between the PDG and the IMS.
  • the WTRU is configured to communicate with both the WLAN and the cellular network and to perform a handover from the WLAN to the cellular network by establishing a connection to the cellular network when the connection to the WTRU is broken by initiating a handover bending session.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Small-Scale Networks (AREA)
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PCT/US2005/044872 2004-12-09 2005-12-09 Interworking of cellular networks and wireless lans Ceased WO2006063330A2 (en)

Priority Applications (12)

Application Number Priority Date Filing Date Title
BRPI0517160-1A BRPI0517160A (pt) 2004-12-09 2005-12-09 método e sistema de trabalho entrelaçado de redes celulares e redes de área local sem fio
JP2007545703A JP4934593B2 (ja) 2004-12-09 2005-12-09 セルラネットワークと無線ローカルエリアネットワークとのインターワーキング方法およびインターワーキングシステム
CA002589768A CA2589768A1 (en) 2004-12-09 2005-12-09 Interworking of cellular networks and wireless lans
MX2007006869A MX2007006869A (es) 2004-12-09 2005-12-09 Metodo y sistema para interfuncionamiento de redes celulares y redes inalambricas de area local.
HK08105552.1A HK1111039B (en) 2004-12-09 2005-12-09 Method and system for interworking of cellular networks and wireless local area networks
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EP05853721.8A EP1825696B1 (en) 2004-12-09 2005-12-09 Method and system for interworking of cellular networks and wireless local area networks
CN2005800424012A CN101142830B (zh) 2004-12-09 2005-12-09 蜂巢式网络及无线区域网络互连方法及系统
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