KR200411873Y1 - Wireless communication system for implementing media independent handover between technologically diversified access networks - Google Patents

Abstract

Wireless, including one or more IEEE 802 multi-stack wireless transmit / receive units (WTRUs) and a plurality of technically diverse access networks, such as IEEE 802.X networks and Third Generation Partnership Project (3GPP), deployed at the same time Communication system. Both multi-stack WTRUs and technically diverse networks include media independent handover (MIH) functions. The WTRU reads MIH information sent from one of the IEEE 802.X networks, triggers 3GPP authentication and authorization procedures based on the MIH information, obtains a local Internet Protocol (IP) address, and obtains the PDG of the 3GPP core network. establishing a tunnel to the packet data gateway and registering the CoA with the home agent of the WTRU, so that the data for the WTRU is via the home agent through a new tunnel established between the home agent and the foreign agent based on the CoA. Is routed.

Wireless communication system, handover, WTRU, MIH, IEEE 802, PDG, CoA, 3GPP

Description

TECHNICAL WIRELESS COMMUNICATION SYSTEM FOR IMPLEMENTING MEDIA INDEPENDENT HANDOVER BETWEEN TECHNOLOGICALLY DIVERSIFIED ACCESS NETWORKS

1 is a block diagram of a wireless communication system constructed in accordance with the present invention.

2 illustrates inter-AN and intra-AN handovers according to the present invention.

3 shows a protocol stack constructed in accordance with the present invention.

4 shows a media independent handover (MIH) management surface according to the present invention.

5A and 5B show protocol stacks of multi-stack WTRU and media access according to the present invention.

6 shows a MIH state machine according to the present invention.

7A, 7B, 7C, 8A, and 8B illustrate external service access points (SAPs) according to the present invention.

9 illustrates use for three groups of example triggers.

10A and 10B together show a process for system access, operation between IEEE 802.X and WLAN / 3GPP, in accordance with the present invention.

11A-11C together show a process for a system access, 802.X and 3GPP task failure case in accordance with the present invention.

12A and 12B together show a process for WTRU initiated and WTRU controlled handover from 802.X to 3GPP in accordance with the present invention.

13 illustrates a tunnel establishment between a WTRU and a packet data gateway (PDG) according to the present invention.

14A-14C together show a process for WTRU initiated handover from 3GPP to IEEE 802.11, in accordance with the present invention.

15 shows establishment of GPRS tunneling protocol (GTP) tunnels according to the present invention.

16A and 16B together show a process for WTRU initiated handover from 802.X to 802.3, in accordance with the present invention.

17A and 17B together show a process for WTRU initiated handover from 802.3 to 802.X, in accordance with the present invention.

18A and 18B together show a process for inter-802 handover of WTRU initiated and WTRU controlled according to the present invention.

19A and 19B together show a process for an 802 handover failure case of WTRU initiated and WTRU controlled according to the present invention.

20A and 20B together show a process for network initiated and network controlled inter-802 handover according to the present invention.

21 shows a process for inter-802 fast handover of WTRU initiated according to the present invention.

22 shows a process for implementing a hierarchical MIPv6 (HMIPv6) using an inter-802 fast handover of a WTRU initiated type according to the present invention.

<Explanation of symbols for the main parts of the drawings>

100: wireless communication system

102, 104: access network

106: 3GPP Core Network

107: BTS / Node-B

108: BSC / RNC

110: IEEE 802 Multi-Stack WTRU

112: multi-layer media interface unit

114: access gateway

116: intranet

120: the Internet

The present invention relates to wireless communication systems. More specifically, the present invention relates to a method and system for technically implementing media independent handovers (MIHs) between various access networks.

Various types of wireless communication systems have been developed to provide different types of services. Some examples of wireless communication systems include cellular networks such as wireless local area network (WLAN), wireless wide area network (WWAN), and universal mobile telecommunication systems (UMTS). Each of these systems has been developed and customized to provide specific applications.

Wireless communication networks are pervasive in corporate, home, and public domains, so that continuous connectivity can be supported when users of these networks move from one network to another. With the advent of an "always-on" lifestyle, wireless transmit / receive units (WTRUs) (ie, mobile stations (MS)) must be able to support multiple heterogeneous networks. Thus, seamless handover between these networks is needed.

The present invention is a wireless communication including one or more IEEE 802 multi-stack WTRUs and a plurality of technically diverse access networks, such as deployed simultaneously, IEEE 802.X networks and Third Generation Partnership Project (3GPP) networks. It's about the system. Both multi-stack WTRUs and technically diverse networks include media independent handover (MIH) functions. The WTRU reads MIH information sent from one of the IEEE 802.X networks, triggers 3GPP authentication and authorization procedures based on the MIH information, obtains a local Internet protocol (IP) address, and stores the PDG (in the 3GPP core network). by establishing a tunnel to the packet data gateway, configuring a care of address (CoA), and registering the CoA with the WTRU's home agent, so that the data for the WTRU is established between the home agent and the foreign agent based on the CoA. Routed through the home agent through the tunnel.

From the following description, presented as an example and to be understood in conjunction with the accompanying drawings, the present invention may be understood in more detail.

Hereinafter, the term " wireless transmit / receive unit (WTRU) " may operate in a mobile station (MS), user equipment (UE), fixed or mobile subscriber unit, pager, or in a wired or wireless environment. Other types of devices, including but not limited to.

Two Letters and Definitions

3G Third Generation

3GPP 3G Partnership Project

AAA Authentication, Authorization, and Accounting)

AG Access Gateway

AN Access Network

AP Access Point

AR Access Router

BS Base Station

BSC Base Station Controller

BSSID Basic Service Set Identifier

BTS Base Transceiver Station

BU Binding Update

ESS Extended Service Set

CoA Care of Address

CoN Correspondent Node

CN Core Network

CVSE Critical Vendor / Organization Specific Extensions

ESSID Extended Service Set ID

FA Foreign Agent

FBU Fast-Binding Update

F-HMIP Fast Handover for Hierarchical Mobile IP

FMIP Fast Handover Mobile IP

FNA Fast Neighbor Advertisement

GGSN Gateway GPRS Support Node

GPRS General Packet Radio Service

GSM Global System for Mobile Communication

GTP GPRS Tunneling Protocol

HLCF Higher Layer Convergence Function

HA Home Agent

HAck Handover Acknowledge

HI Handover Initiate

HMIP Hierarchical Mobile IP

HO Handover

HOF Handover Function

IEEE Institute of Electrical and Electronics Engineers

IETF Internet Engineering Task Force

ICMP Internet Control Message Protocol

IP Internet Protocol

ISP Internet Service Provider

L1 Physical Layer (PHY)

L2 Medium Access Control (MAC) layer and Logical Link Control (LLC)

L3 Layer 3

L2TP L2 Tunneling Protocol

L3SH L3 Soft Handover

LAN Local area Network

LCoA On-Link Care of Address

LLC Logical Link Control

LLCF Lower Layer Convergence Function

MA Media Access

MAC Medium Access Control

MAP Mobility Anchor Point

MIH Media Independent Handover

MIHO Media Independent Handover

MIHS Media Independent Handover Services

MIP Mobile IP

MLME MAC Layer Management Entity

MN Mobile Node

MS Mobile Station

MT Mobile Terminal

NVSE Normal Vendor / Organization Specific Extensions

PDG Packet Data Gateway

PHY Physical Layer

PLMN Public Land Mobile Network

QoS Quality of Service

RCoA Regional Care of Address

RFC Request for Comment

RNC Radio Network Controller

SAP Service Access Point

SGSN Serving GPRS Support Node

SNR Signal Noise Ratio

TCP Transmission Control Protocol

UDP User Datagram Protocol

UE User Equipment

UMTS Universal Mobile Telecommunications System

WAG Wireless Access Gateway

WLAN Wireless local area Network

WPAN Wireless Personal Area Network

WMAN Wireless Metropolitan Area Network

WTRU Wireless Transmit / Receive Unit

1 is a block diagram of a wireless communication system 100 constructed in accordance with the present invention. The wireless communication system 100 includes a plurality of AN in deployment is Roy at the same time according to different standards _{(102 1 -102 x, 104 1} -104 x) and (Third Generation Partnership Project), a plurality of 3GPP core networks (CN; 106 ₁ -106 _x ). In one of the stack WTRU (110) of the AN _{(102 1 -102 x, 104 1} -104 x) s while performing handover between the _{AN (102 1 -102 x, 104} 1 -104 x) - IEEE 802 multi- Can be accessed. The _{AN (102 1 -102 x, 104} 1 -104 x) is the IEEE 802 AN (102 ₁ - 102 _x), and the 3GPP RAN (radio access networks; 104 1 -104 x) include, but are not limited thereto no. The _{IEEE 802 AN (102 1 -102 x} ) may operate in accordance with IEEE 802.3, IEEE 802.11, IEEE 802.15 and IEEE 802.16 standard. In the following, the present invention will be described with reference to IEEE 802 ANs and 3GPP RAN, but the present invention can be applied to any other types or ANs.

The 3GPP RAN (104 ₁ -104 _x) and each including a BTS (base transceiver station) / Node -B (107) and BSC (base station controller) / RNC (radio network controller) (108). BSC / RNC (107) is a plurality of 3GPP core network; is connected to one of (CN 106 ₁ -106 _x). The _{IEEE 802 AN (102 1 -102 x} ) is a multi-layer and a media interface unit 112 and an access gateway (114). Multi-layer media interface unit 112 performs physical layer functions and medium access control (MAC) layer functions. Access gateway 114 is a unified interface to, external networks such as the Internet 120 or the _{3GPP CN (106 1 -106 x)} . The access gateway 114 includes an access router 116 for routing data packets to and from external networks. Thus, IEEE 802 multi-stack WTRU 110 may communicate with CoN 140 over the Internet 120. The IEEE 802 multi-stack WTRU 110 may also communicate with a home agent 142 and a home authentication, authorization and accounting (AAA) server 144 by the home network 146.

3GPP CN s (106 ₁ -106 _x), each AAA server (132), WAG (WLAN access gateway; 134), PDG / GGSN (gateway GPRS (general packet radio service) serving node) / FA (foreign agent) (136 And SGSN (serving GPRS support node) 138. GGSN and PDG may operate as FAs if IPV4 is to be supported. PDG can be implemented from an existing GGSN using a subset of GGSN functions and tunnel termination points. WAG (134) is, IEEE 802 multi-3GPP to provide services to the stack WTRU (110), therefore the data by the access router 116 in the AN (102 ₁ -102 _x) and from the access router 116 Is the gateway to which it is routed. The 3GPP AAA Server 132 provides AAA services to the IEEE 802 multi-stack WTRU 110. PDG 136 is a gateway for 3GPP packet switching (PS) -based services.

2 illustrates two different handover scenarios implemented in accordance with the present invention. In Figure 2, two different IEEE 802 ANs 202 ₁ , 202 ₂ are deployed. In a first scenario, mobile Internet protocol (MIP) handover is implemented between the IEEE 802 multi-stack WTRU 110 and two different ANs 202 ₁ , 202 ₂ . In a second scenario, handover is implemented between the IEEE 802 multi-stack WTRU 110 and two different IEEE 802 MA (media access) entities 212 ₁ , 212 _{2 in the} same IEEE 802 AN 202 ₂ . . In the second case, MIP is unnecessary because mobility can be handled below layer 3.

3 shows a protocol stack 300 constructed in accordance with the present invention. The protocol stack includes a user surface 310 and a separate MIH management surface 320 for performing MIH operations. The MIH management face 320 is parallel to the user face 310.

The MIH management surface 320 includes a MIH higher layer convergence function (HLCF) 322, a handover function (324) and a lower layer convergence function (MILF LLCF) 326. MIH HLCF 322 provides an interface between MIH handover surface 320 and a mobility management entity of a particular technology. The HOF 324 collects handover events from the MIH LLCF 326 and determines whether handover is needed based on certain criteria (eg, link quality, service and subscription). MIH LLCF 326 provides an event service that compiles specific physical layer (PHY) and MAC layer events for a given technology. The event service may be configured to determine the set of MAC and PHY measurements that need to be collected. An event indication is generated when certain events or a set of predetermined events meet configured criteria (eg, signal-to-noise ratio threshold). Note that MIH HLCF 322 and MIH LLCF 326 are implementation features, and all descriptions of MIH HLCF and MIH LLCF in the present invention are provided by way of example and not limitation, and any other variations may be possible. Should be.

As shown in FIG. 3, the MIH management surface 320 may include another technology-specific handover (HO) function 330 (eg, fast handover or IEEE 802.16 Netman mobility functions in an IEEE 802.11r ESS). Can coexist with If no other handover entity is present, handover triggers from the PHY and MAC are sent directly to the MIH LLCF 326. If the MIH handover surface 320 coexists with the technology-specific HO management surface 330, a two-tier handover method is used, which is implementation specific. For example, one handover management entity may control handover procedures or a combination of functions from two entities may be implemented.

4 shows a detailed MIH management surface 320 according to the present invention. MIH handover surface 320 interfaces with the system at both the upper and lower layers through convergence functions. These convergence functions are system-specific, and there may be multiple functions to support all system-specific specifications.

It is preferred that multiple MIH HLCFs 322 and MIH LLCFs 326 are provided. For example, MIH cellular HLCF 322a for interfacing with a cellular system, MIH mobile IP HLCF 322b for mobile IP interactions, and for handover in the same intra-IP subnet for HLCF. There is an HLCF 322c in the MIH IP subnet, and a MIH 802.X LLCF 326b, 326c for the IEEE 802 systems for the MIF cellular LLCF 326a for the cellular system and the LLCF.

5A and 5B show protocol stacks of IEEE 802 multi-stack WTRU 110 and IEEE 802 AN in accordance with the present invention. As noted above, the MIH management plane is provided parallel to the user plane in both IEEE 802 multi-stack WTRUs 110 and AN, the MIH LLCF interfaces to the MAC and PHY layers, and the MIH HLCF is used for upper layer applications. Interface.

6 shows a MIH state machine 600 according to the present invention. MIH state machine 600 may be applied to both the network and the WTRU, depending on whether the handover is network initiated or WTRU initiated. Five states are defined: initialization state 602, network discovery / update state 604, MIH steady state 606, MIH handover ready state 608, and MIH handover execution state 610.

In the initialization state 602, the handover configuration parameters are initialized and then transition to the network discovery / update state 604. In the network discovery / update state 604, the MIH management surface 320 gathers information about the system topology from different technologies and about the network topology including neighbor lists. A transition to MIH steady state 606 is made when the MIH steady state start condition is met (step 612) and a reverse transition to network discovery / update 604 is made when the MIH steady state end condition is met (step 614). . During operation, MIH management surface 320 performs network updates to obtain the latest system conditions. The MIH steady state 606 represents a state in which the link condition is good and there is no need to perform handover. However, in the background, handover discovery may be performed to take up the latest neighbor list conditions.

Upon receipt of the MIH handover request, if there is no in-technology handover in progress, a transition to MIH handover ready state 608 is performed to prepare for a new link (step 616). Without releasing an established link, it is desirable that a new link be established (ie, make before break (MBB)). If the MIH handover setup is interrupted (step 618), the MIH returns to the MIH steady state 606. If MIH handover preparation is properly realized, the MIH transitions to MIH handover execution state 610 if there is no intra-technology handover (step 620). If MIH handover is successfully performed (step 624), the MIH transitions back to MIH steady state 606. However, if the MIH handover is stopped (step 622), the MIH transitions back to the MIH handover ready state 608.

It describes the flow of information across boundaries between layers in terms of service access points (SAPs), which are defined as primitives representing different information items and generating actions. Since there are several lower layers, SAPs, by each of the specific convergence functions, SAPs that provide MIH handover services to MIH HLCFs, SAPs that provide MIH handover services to MIH LLCFs, and an external It is separated into a set of services provided in layers (layers of non-IEEE standards). 7A-7C, 8A and 8B show external SAPs according to the present invention.

Triggers are used to provide internal, external and peer communication. These triggers do not look so on the medium (eg, an access interface), but serve to more clearly define the relationships between the different layers and faces. 9 illustrates the use of three example trigger groups. These are identified as A, B, and C. The numbers represent the sequence of triggers in the same group.

Group A shows peer-to-peer communication between first peer 910 and second peer 950. Both the first peer 910 and the second peer 950 have a MIH management face 920, 970 and a user face 930, 960, respectively. An initial request for service from the MIH handover function 924 to the MIH LLCF 926 is provided by the “Request” trigger 1A. This request is sent to the second peer MIH LLCF 976 as indicated by the dotted line. The second peer's MIH LLCF 976 generates a " instruction " trigger 2A to notify the MIH handover function 974 of the request. MIH handover function 974 responds to MIH LLCF 976 with a “response” trigger 3A. This response is sent over the link to the LLCF 926 of the first peer, which sends an “acknowledge” trigger 4A to the MIH handover function 924.

When information is transferred from a high level entity to a low level entity within the same management plane and within the same node, a pair of "Request" and "Confirm" are used as indicated by 1A and 4A.

Group B shows a scenario when information is transferred from a low level entity to a high level entity within the same management plane and within the same node. A pair of "instructions" and "responses" are used as indicated by 1B and 2B.

Group C illustrates a scenario where information is exchanged between MIH HLCFs 922 and 972 and applications in the upper layer, such as Mobile IP functions 932 and 962. A pair of "instructions" and "responses" are used as indicated by 1C and 2C.

According to the present invention, several remote transmission options are supported. Since the MIH can transmit general messages delivered to the MAC layer as primitives, dedicated management messages can be used to exchange information and delivered as SAP primitives in the other MIH function. The MIH can generate and exchange messages through MIP vendor-specific extensions. Similar to 802.1X, Ethernet-type frames can be used to exchange information between management planes. A hybrid approach may be used in which different convergence layers implement different transport mechanisms.

Internal triggers are triggers in MIH functions. External triggers are triggers between the MIH management plane and the user plane. Tables 1 and 2 summarize the external and internal triggers. MIH_PHY.set, MIH_PHY.get and MIH_PHY.reset triggers correspond to MIH_PHYCONFIG triggers. The MIH_MAC.set, MIH_MAC.get, and MIH_MAC.reset triggers correspond to the MIH_PHYCONFIG trigger. These triggers constitute information that should be broadcast over the air to help the WTRU discover and select the appropriate network. In addition, these triggers set thresholds at both the PHY and MAC layers used to determine when an event should be triggered.

Triggers sauce Destination Local / remote Explanation MIH_PHY.set (MIH_PHYCONFIG) MIH PHY all MIH constitutes a PHY for information services MIH_PHY.get (MIH_PHYCONFIG) MIH PHY all MIH Queries Configuration Information MIH_PHY.reset (MIH_PHYCONFIG) MIH PHY all MIH resets PHY configuration MIH_MAC.set (MIH_MACCONFIG) MIH MAC all MIH configures MAC for information services MIH_MAC.get (MIH_MACCONFIG) MIH MAC all MIH Queries Configuration Information MIH_MAC.reset (MIH_MACCONFIG) MIH MAC all MIH resets MAC configuration MIH_MACINFO.indication MAC MIH local MAC sends system information MIH_MACINFO.response MIH MAC local Response to the above instructions MIH_INFO.indication MIH MIH L2, L3 Handover local MIH entities indicate the presence of MIH functions MIH_INFO.response L2, L3 Handover MIH local Response to the above instructions MIH_PHYEVENT.indication PHY MIH all PHY measurement reports MIH_PHYEVENT.response MIH PHY all Response to the above instructions MIH_MACEVENT.indication MAC MIH all MAC measurement reports MIH_MACEVENT.response MIH MAC all Response to the above instructions MIH_MACORDER.request MIH MAC local MIH requests HO related MAC operations MIH_MACORDER.confirmation MAC MIH local The MAC notifies the MIH that the operation has been realized. MIH_HANDOVER_COMPLETE MAC MIH local The MAC notifies the MIH that the new data path has been successfully switched over a new access link (eg, a radio connection). MIH_HANDOVER_PREPARE.indication MIH MIH MIP MAC local MIH notifies external entities to prepare for handover MIH_HANDOVER_PREPARE.response MIP MAC MIH MIH local Response to the above instructions MIH_HANDOVER_COMMIT.indication MIH MIH MIP MAC local MIH notifies external entities to perform handover MIH_HANDOVER_COMMIT.response MIP MAC MIH MIH local Response to the above instructions

Triggers sauce Destination Local / remote Explanation MIH_SYSINFO.indication MIH LLCF HOF local MIH LLCF notifies HOF of any system information update MIH_SYSINFO.response HOF MIH LLCF local Response to the above instructions MIH_MOBILITY.request HOF MIH LLCF all HOF sends a handover decision to MIH LLCF MIH_MOBILITY.indication HOF MIH HLCF all The HOF notifies the MIH HLCF and the peer HOF of the handover decision. MIH_MOBILITY.response MIH HLCF HOF all Response to the above instructions MIH_MOBILITY.confirmation MIH LLCF HOF all Confirmation of HOF Mobility Request MIH_REPORT.indication MIH LLCF HOF local MIH LLCF sends MIH triggers to HOF MIH_REPORT.response HOF MIH LLCF local Response to the above instructions MIH_MACRELEASE.request HOF MIH LLCF local When handover procedures are over, the HOF notifies the MIH LLCF. MIH_MACRELEASE.confirmation MIH LLCF HOF local Confirmation of the above request

10A and 10B together show a process 1000 for system access, IEEE 802.X and WLAN / 3GPP inter-tasking, in accordance with the present invention. Power is applied to the WTRU 110 and the HOF 324 is initialized. The WTRU 110 performs scanning (active or passive) to find a suitable WLAN / 3GPP network (step 1002). The WLAN periodically transmits beacon frames for this purpose. The MIH function of the WLAN may order the content change of the beacon frame at any time (step 1004), which is conveyed as a MIH_MACCONFIG message (step 1006). This may occur dynamically as a manual request from the management system or based on radio environmental measurements and the like.

If a WLAN network is found, the WTRU 110 reads beacon information sent by the network (step 1008). Alternatively, the WTRU 110 may attempt to fetch system information via a probe request message and a probe response message or by accessing a notification database in the candidate system at a later stage.

When beacon frames are detected, the WTRU 110 first checks whether MIH information is supported (eg, by some 802.21 flag broadcast over the beacon frame). If so, the WTRU 110 reads its contents. Any MIH information (e.g., system operator identification information, PGSs (W-APN), neighbor maps and SMS, IMS, VoIP and other system capabilities) found within the beacon frame is sent via the MIH_MACINFO message. Is passed to HOF 324 (step 1010). MIH specific information is set or updated manually or dynamically by AN HOF 324.

HOF 324 retrieves system information, selects a candidate 3GPP network based on this information, and triggers 3GPP authentication and association procedures for the selected network (step 1012). The MIH requests authentication and association via a MIH_MACORDER message (step 1014). Between WTRU 110 and AG 114, an extensible authentication protocol over local area network (EAPOL) procedure is initiated (step 1016). As part of this procedure, the WTRU 110 provides the relevant network access identification (NAI). AG 114 uses the NAI to route the authentication procedure to the associated AAA server. AG 114 triggers authentication key agreement (EAP-AKA) authentication and relays messages to 3GPP AAA server 132 (step 1018). The AG 114 may route AAA messages to other servers to provide basic services.

Due to the successful routing of EAP-AKA messages, an Internet protocol security (IPsec) tunnel is established that carries the EAP-AKA messages. In addition, the AG 114 may use the NAI to determine whether the user requests a basic service or a premium service. NAI can also be used to route messages to specific ports that can only provide services such as network credentials available to this particular user.

Upon successful authentication and authorization, the WTRU 110 obtains an IP address from a local dynamic host configuration protocol (DHCP) server or using an address resolution protocol (ARP) (step 1022). Using the selected PDG (-APN), the WTRU 110 derives a fully qualified domain name (FQDN) (step 1024). The WTRU 110 uses the FQDN to determine the IP address of the associated PDG that is using the local domain name server (DNS) (steps 1026 and 1028). Once the PDG IP address has been obtained, a WTRU-PDG tunnel can be established (step 1030 or 1032).

The WTRU-PDG tunnel can be established in four different ways, 1) the WTRU 110 establishes a tunnel directly to the PDG; 2) the WTRU 110 establishes a tunnel to the WAG 134 and further establishes a tunnel from the WAG 134 to the PDG 136; 3) After the AG 114 establishes a tunnel to the WAG 134, a tunnel from the WAG 134 to the PDG 136 is further established; 4) The AG 114 establishes a tunnel directly to the PDG 136.

After the tunnel is established, the WTRU 110 receives agent advertisement messages from the PDG (operating as an external agent) or requests it using an agent discovery message according to RFC2002 (step 1034). The WTRU 110 configures its care of address (CoA) using the PGA router address (step 1036). The WTRU 110 registers its CoA with its home agent (HA) 142 (step 1038). Data for WTRU 110 is now routed via HA 142 via a new tunnel established between HA 142 and FA 136 based on the supplied CoA (step 1040).

11A-11C together show a process 1100 for system access and a 802.X and 3GPP inter-task failure case, in accordance with the present invention. The WTRU is powered up and the MIH handover function is initialized. The WTRU performs scanning (active or passive) to find a suitable WLAN / 3GPP network (step 1102). The WLAN periodically transmits beacon frames for this purpose. The HOF 324 of the WLAN can order the content change of the beacon frame at any time (step 1104), which is conveyed by the MIH_MACCONFIG message (step 1106). If a WLAN network is found, the WTRU reads beacon information (step 1108). The WTRU reads the beacon information and it is passed to the HOF 324 via the MIH_MACINFO message (step 1110).

The MIH function determines whether one or more values provided in the system information parameters meet the conditions necessary for system access (step 1112). For example, the MIH function determines whether the system operator is exposed, whether the quality of service (QoS) is appropriate, or whether there is a better candidate identified in the potential neighbor set provided in the message.

If the MIH function determines that the parameters provided by the information service do not meet the configured internal requests, the MIH function uses the MAC_ORDER message to order the MAC layer to return to the scanning state (step 1114).

If the requirements are met, the MIH function triggers EAPOL authentication using the MIH_MACODER message (step 1116) and the EAPOL procedure is initiated (step 1118). The AG 114 may determine the service level (eg, 3GPP IMS) required by the user based on the NAI that triggered the authentication procedure or the authentication procedure itself.

WTRU authentication is performed according to EAPOL procedures (step 1120). If authentication fails, system access is denied and the WTRU returns to an initialization state (step 1122). If the provided NAI does not determine any 3GPP server, AG 114 may deny access or head to the local server for further processing (step 1124). For example, the AG 114 may determine that the user is still allowed to receive basic services even if the authentication procedure for premium services fails. If the AG 114 cannot route the authentication request, the AG 114 may respond by indicating the available AAA servers to which the request may be routed. If the WTRU determines that no suitable AAA servers exist, the WTRU may decide to return to the initialization state (step 1126).

If successful routing of AAA messages is realized, an IPSec tunnel is established between AG 114 and 3GPP AAA server 132, and AG 114 relays the EAP messages to AAA server 132 (step 1128). AG 114 acts as an authenticator between the WTRU and the AAA server. AG 114 relays authentication messages between the WTRU and the associated AAA server.

If the WTRU fails the cellular authentication procedure (step 1130), access to special services, such as 3GPP services, may be denied and the WTRU returns to an initialization state (step 1132). Alternatively, AG 114 may still allow access to basic services (eg, Internet services) or to a portal that can provide additional information to the user.

If the cellular AAA server successfully authenticates the WTRU, the WTRU proceeds to obtain a local IP address from local DHCP (step 1134). Using the W-APN, the WTRU constructs an FQDN (step 1136) and attempts to obtain a PDG IP address based on the FQDN (step 1138). If the DNS server cannot translate the FQDN into any IP address, the WTRU may not access the PDG in the existing WLAN network (step 1140). The WTRU may choose to return to the initialization state or reside in the WLAN for services only (step 1142). The AG 114 may choose to provide a "default" PDG address. In this case, the WTRU will provide this information to the end user who can decide to connect to the default PDG. This procedure may be automated based on configuration parameters in AG 114 and WTRU 110.

If the DNS returns a valid PDG address, the WTRU 110 establishes a tunnel (eg, an L2TP tunnel) towards the PDG 136 and listens for agent notification messages from the PDG 136 (step 1144). If agent notification messages are not received, the WTRU 110 sends an agent discovery.

If a response is not received (step 1146) (eg, if MIP is not supported), packet delivery from another PDN is still possible through PDG 136. The WTRU 110 may use a local IP address or request PDP context activation (step 1148). In this case, the WTRU-PDG tunnel IP traffic is routed directly from the WTRU 110 to the Internet 120 by the PDG 136, and seamless mobility is not supported beyond the PDG 136.

12A and 12B together show a process 1200 for WTRU initiated and WTRU controlled handover from 802.X to 3GPP, in accordance with the present invention.

12A, a user data flow is established via 3GPP PDG 136 between WTRU and CoN 140 for 802.X (step 1202). The PDP context is active in GGSN. The MIH handover function receives measurements while the MIH management entity is in a steady state. If the physical layer detects that certain performance thresholds have been exceeded, the physical layer sends an event indication MIH_PHY_EVENT to the MIH handover function (step 1204). If the MAC layer detects that performance thresholds have been exceeded, the MAC layer sends an event indication MIH_MAC_EVENT to the MIH handover function (step 1206).

The MIH processes and filters the measurements of the MAC and PHY layers (step 1208) and performs a handover evaluation (step 1210). The combination of events, such as signal quality and specific network characteristics (eg, preferred PLMN), can be used to determine whether the handover process will be triggered. If the MIH handover function determines that a handover attempt is to be triggered because the condition (or a combination thereof) has been met, the MIH notifies the 3GPP layer of the IEEE 802.X side that the handover is imminent (via HOP_PREPARE). (Step 1212).

Based on this trigger, the WTRU initiates cell selection and performs routing area update (step 1214). Routing area update is a process executed by the WTRU to notify the network whenever a WTRU moves from one area to another. The WTRU is responsible for keeping track of routing area codes. If the routing area code is different from its last update, the WTRU performs another update by sending it to the network. At this point, both a radio connection and connections to the new SGSN are established (step 1216).

The new SGSN requests a packet data protocol (PDP) context transfer from the PDG (step 1218). The PDP context includes the subscriber's session information, including the subscriber's session information, including the subscriber's IP address, the subscriber's IMSI, the GGSN 136, the tunnel ID in the SGSN 138, etc., if the subscriber has an active session. And data present in both GGSN 136.

13 illustrates a tunnel established between the WTRU and the PDG according to the present invention. A "snap shot" for the current PDP context is taken at the PDG for both uplink and downlink flows. The PDG forwards this information to the new SGSN. Immediately after the PDP context is delivered, the PDG stops transmitting downlink packets towards the WTRU. After this time packets received from the GGSN are buffered. When the PDG is ready to begin processing the packets, the RNC establishes a new GTP tunnel and sends a copy of the buffered packets to the PDG via the old SGSN. This is done until the timer expires. The PDP is the context that is updated in the GGSN and a new GTP tunnel can be established (by the Gn 'interface). Packets are now received directly from the GGSN via the PDG.

12B, upon successful PDP context transfer, the 3GPP layer notifies the MIH handover function that the handover has completed successfully (step 1220). At this time, 3GPP lower layer and upper layer connections are established (step 1222), and user data flow proceeds between WTRU 110 and CoN 140 on the 3GPP network (step 1224). HOF 324 orders release (e.g., disconnection) of the IEEE 802.X radio connection (step 1226), and the old media is disassembled (step 1228).

14A-14C together show a process 1400 for WTRU initiated handover from 3GPP to IEEE 802.11 in accordance with the present invention. User data flow is established between the WTRU 110 and the CoN 140 on the 3GPP network (step 1402). System information is sent from the 3GPP network to the WTRU 110 (step 1404). The 3GPP layer extracts relevant system information that can be used to determine if handover to the WLAN system can be guaranteed and the 3GPP layer passes this information to the MIH handover function (step 1406). Alternatively, the IEEE 802.X layer of the WTRU 110 may execute periodic scanning, either continuously or when prompted by system information received from the 3GPP component (step 1408).

Relevant 3GPP system information is passed to the MIH function (steps 1410 and 1412). The MIH handover function determines whether a suitable WLAN exists for selection based on available information (eg, explicit indication, RF signature, geographic location, manual or automatic scanning, specific TMSI assignment, etc.) (step 1414). ). The MIH function then generates a list of potential candidates for handover (step 1416). The MIH function evaluates candidates for handover based on several aspects, such as system operator and known system qualifications (step 1418).

The MIH handover function finds the target for the handover and triggers a handover to the 802.X system via the MIH_MACORDER message (steps 1420 and 1422). The WTRU 110 performs association and authentication of the 802.X system for the target WLAN system (step 1424).

Once the WTRU 110 is successfully associated and authenticated (step 1426), an EAP is used for the associated 3GPP AAA server 132 according to RFC 2284 (step 1428). The WTRU 110 constructs the FQDN using the WLAN identification and associated PLMN, and uses it to obtain the associated PDG address via a DNS query. The WTRU 110 uses this address to establish an end-to-end tunnel towards the PDG 136 (eg, using L2TP) (step 1430). Once the tunnel is established, the WTRU 110 performs a routing area update towards the PDG 136. Routing data updates received at the PDG 136 trigger a context transfer request towards the old SGSN 138.

The PDG 136 establishes a new GPRS tunneling protocol (GTP) tunnel as shown in FIG. 13 and transmits all buffered packet copies to the new SGSN. This is done until the timer expires or until a new SGSN is ready to begin processing packets. When the new network has successfully activated the PDP context, we are ready to begin processing packets. The PDP context can be updated in the GGSN and a new GTP tunnel can be established. Packets are now received directly from the GGSN towards the new SGSN.

15 shows the tunnel and GGSN between the old RNC and old SGSN. A "snap shot" of the current context is taken from the old RNC and sent to the PDG via the old SGSN. Both uplink and downlink context information are captured. Immediately after the PDP context is sent, the RNC stops sending downlink packets to the WTRU 110. Packets received from this GGSN 136 after this time are buffered.

Referring back to FIG. 14, after the 802.X lower and upper layers have been established (step 1434), a user data flow from WTRU 110 to CoN 140 over the IEEE 802.X network is established (step 1436). ). Although the HOF_COMMIT message (step 1438) and the 3GPP radio access bearer (RAB) may be released (step 1440), the MIH notifies that the handover is complete.

16A and 16B together show a process 1600 for WTRU initiated handover from 802.X to 802.3 in accordance with the present invention. While the data path is established between the WTRU 110 and the IEEE 802.X network (step 1602), an 802.3 physical connection is established (step 1604) and the MIH indicates that the IEEE 802.3 physical connections (e.g., an RJ45 cable has been plugged in). (Step 1606).

Upon detection of the 802.3 physical connection by the lower layers, a MIH_PHY_EVENT message is sent towards the MIH handover function (step 1608). This message provides the characteristics of the physical link used to determine if handover should be performed. Multi-stream connections similar to "layer 3 or IP-based soft-handover (L3SH)" may be attempted. This makes A.C. It depends on several factors, such as the availability of power.

The MIH handover function continuously processes and filters the information provided by the lower layers (step 1610) and performs a handover evaluation to determine if one or more conditions meet the criteria for triggering the handover procedure. (Step 1612).

If the determination is affirmative, the MIH handover function triggers handover procedures (step 1614). This includes the transfer of context information (eg, header compression context, PPP context, etc.) and switching of user data. If L3SH is used, the context can only be activated after a new connection from the new router to CoN 140 is established. This information (L3SH support) needs to be communicated between the old and new access routers.

The MIH handover function uses the HOF_PREPARE message to trigger both context transfer and MIP procedures in the MIP component (step 1616). The WTRU 110 obtains a new IP address from the IEEE 802.3 AG using the newly established physical connection (step 1618). Using the information from the HOF_PREPARE message or using an existing MIP message, the WTRU 110 obtains the IP address of the new AG (ie, 802.3 AG). As such, the WTRU 110 may contact the IEEE 802.3 AG to initiate context transfer procedures (step 1620).

While the context is being sent to the new AG 802.3 AG (step 1622), the data is passed from the old AG (802.X AG) (step 1624). This allows the WTRU 110 to receive user data before the new CoA is negotiated with the new 802.3 access router (in IEEE 802.3 AG). The new AG must determine whether the context engine should be activated or whether the data stream should simply be relayed to / from the WTRU 110. This may be done based on the L3SH information provided by the old router.

The WTRU 110 negotiates with the new CoA using existing MIP messages (step 1626). Since the new CoA is ready and the lower layer connection has been established (step 1628), the user data path can now be switched to the new AG at CoN 140 (step 1630). User data is now completely moving over the IEEE 802.3 network.

A HOF_COMMIT message is sent (step 1632) to inform the MIP layer that the old CoA can now terminate the registration. The MIH tears down the IEEE 802.X connection via the MIH MACORDER message (steps 1634, 1636). Optionally, the MIH may maintain an old 802.X connection to prevent reassociation procedures when reverse handover to 802.X should be performed.

17A and 17B together show a process 1700 for WTRU initiated handover from 802.3 to 802.X, in accordance with the present invention. Since the 802.3 connection has been established, connections of lower layers (MAC / PHY) and upper layers (eg, IP / MIP) are established (steps 1702, 1704). User data travels between the IEEE 802.3 WTRU and the 802.3 network (step 1706). MIH system information may be provided to the MIH handover function (step 1708).

The MIH processes the MIH_PHY_EVENT message (step 1710). A.C. Some events, such as the availability of a power source, may cause MIH trigger simultaneous connection of both 802.3 and 802.X (step 1712). If the MIH handover function determines to hand over to the 802.X system (step 1714), the MIH handover function issues a MIH_MACORDER message that triggers the association and authentication procedures (step 1716). An 802.X physical connection may optionally be established (step 1718). To facilitate the transfer of context information, the WTRU 110 may optionally provide information about the current 802.3 anchor point (step 1720). The 802.3 anchor point is defined as IEEE 802.3 AG, which holds context information for the current IEEE 802.3 connection. This information is used by IEEE 802.X AG to request context transfers for which handover is imminent.

If the IEEE 802.3 connection is no longer valid (eg, when the RJ45 cable is unplugged), an event by the lower layers is triggered via the MIH_PHY_EVENT message (step 1722). The MIH function evaluates conditions that may have triggered a trigger (e.g., a link is down), and requests transmission of 802.X system access and context information (if the WTRU 110 is not yet associated). It is determined that should be issued (step 1724).

The MIH handover function uses a HOF_PREPARE message to alert the MIP entity that a new AN should be initialized (step 1726). This triggers context information transfer and user data transfer from the old AG 803.2 to the new AG 802.X.

The WTRU 110 obtains a new IP address from IEEE 802.X AG using ARP or DHCP (step 1728). This step may be performed earlier. This may occur when the WTRU 110 is first associated with and authenticated with IEEE 802.X AG. If an IEEE 802.X IP address can be used, the WTRU 110 triggers a context transfer procedure and a data transfer procedure from the old 802.3 AG to the new 802.X AG (steps 1730, 1732). If L3SH is used, the context can only be activated after a new connection from the new router to CoN 140 is established. This information (L3SH support) must be communicated between the old and new access routers.

While the context is being sent to the new AG (802.X AG), the data is passed from the old AG (802.3 AG) (step 1734). This allows the WTRU 110 to receive user data before the new CoA is negotiated with the new 802.X access router (in IEEE 802.X AG). The new AG must determine whether the context engine should be activated or whether the data stream should simply be relayed from / to WTRU 110. This may be done based on the L3SH information provided by the old router.

The WTRU 110 then negotiates with the new CoA using existing MIP messages (step 1736). Since the new CoA has been prepared and the connections of the lower layers have been established, the user data path can now be switched from CoN 140 to the new AG (step 1738). The HOF_COMMIT message is sent to the MIP side to notify that the old CoA can now be deregistered (step 1740).

18A and 18B together show a process 1800 for WTRU initiated and WTRU controlled inter-802 handover in accordance with the present invention. Since the 802.X lower layer and upper layer procedures have been completed (steps 1802 and 1804), a data path with an IEEE 802.X network is established (step 1806). While an IEEE 802.X session is in progress, a data path exists between the WTRU 110 and the IEEE 802.X AN. MIH in an IEEE 802.X network may optionally provide system information to its peers (step 1808). Information about potential neighbors may optionally be provided to a peer to peer (P2P) by MIH_SYSINFO message.

The measurements of the MAC / PHY are sent to the MIH function by MIH_PHY_EVENT (step 1810). Telemetry measurements may also be communicated to the WTRU 110 (steps 1812, 1814, 1816). The MIH LLCF processes the measurements (step 1818). For example, the MIH LLCF may average some measurements and compare them with thresholds to generate triggers to indicate the HOF.

The HOF 324 determines whether handover is necessary based on the information it takes from network information services and measurement reports (step 1820). To make wise decisions, the MIH handover function maintains information from the system information update (eg, neighbor list and information of neighbor networks). The MIH handover function makes preventive handover decisions in two stages of preparation and execution. Different thresholds and decision making algorithms may be used for these two steps.

If the MIH determines that handover is imminent, the MIH triggers a handover preparation procedure for the network by sending HOF_PREPARE messages in both MIP and MAC / PHY (steps 1822, 1824). MIP and Layer 2 begin to prepare for handover. The WTRU 110 establishes a new layer 2 link with the IEEE 802.Y network (step 1826).

The WTRU 110 obtains a new IP address from the IEEE 802.X network (step 1828). This step may occur earlier. The WTRU MIP triggers a context transfer from the IEEE 802.X network to the IEEE 802.Y network (step 1830). While the context is being sent to the IEEE 802.Y network, data may be transferred from the IEEE 802.X AG to the IEEE 802.Y AG (step 1832). This allows the WTRU 110 to receive user data before the new CoA is negotiated with the IEEE 802.Y router.

The WTRU 110 negotiates with the new CoA using existing MIP messages (step 1834). Since the new CoA is ready and connections of the lower and upper layers have been established (step 1836), the user data path is now switched to the IEEE 802.Y network (step 1838).

A HOF_COMMIT message is sent (step 1840) to notify the MIP side that the old CoA may be deregistered. Optionally, the old layer 2 connection may be resolved by the MIH_MACORDER message (steps 1842 and 1844).

19A and 19B together show a process 1900 for WTRU initiated and WTRU controlled inter-802 handover failure cases. Failure can occur in many steps. As the 802.X lower layer and upper layer procedures are completed (steps 1902 and 1904), a data path with an IEEE 802.X network is established (step 1906). The MIH in the IEEE 802.X network may optionally provide system information to its peers (step 1908). Measurements of the MAC / PHY are sent to the MIH function by MIH_PHY_EVENT (step 1910). Telemetry measurements may also be communicated to the WTRU 110 (steps 1912-1916). The MIH LLCF processes the measurements (step 1918). The MIH handover function determines whether handover is necessary, based on the information it takes from network information services and measurement reports (step 1920). If the MIH determines that handover is imminent, the MIH triggers a handover preparation procedure by sending HOF_PREPARE messages over both the MIP and MAC / PHY (steps 1922, 1924). Both MIP and Layer 2 begin to prepare for handover.

If a layer 2 link to the IEEE 802.Y network cannot be established (step 1926), the lower layer may optionally notify the MIH of failure or the timer will expire. The MIH then returns to normal. When the MIH sends HOF_PREPARE to the upper layer (step 1924), the WTRU 110 attempts to obtain a new IP address from the IEEE 802.X network. If the WTRU 110 fails to obtain a new IP address (step 1928), the lower layer may notify the MIH of the failure, or the timer will expire. The MIH then returns to normal (step 1930).

If all of the above is successful, the WTRU MIP triggers a context transfer from the IEEE 802.X network to the IEEE 802.Y network (step 1932). If the context transfer fails, the MIH returns to normal state (step 1934). Optionally, the MIH may tear down the layer 2 link to the IEEE 802.Y network. If the context is successfully transmitted to the IEEE 802.Y network, data may be transferred from the IEEE 802.X AG to the IEEE 802.Y AG (step 1936). This allows the WTRU 110 to receive user data before the new CoA is negotiated with the IEEE 802.Y router.

If the WTRU 110 fails to negotiate with the new CoA using existing MIP messages (step 1938), then the transmission context at 802.Y should be deleted (step 1940). Assuming the context still exists in IEEE 802.X, data transfer should be stopped. The MIH then returns to normal (step 1942). Once the new CoA is ready and the connection of the lower and upper layers is established (step 1944), the user data path is now switched to the IEEE 802.Y network (step 1946).

A HOF_COMMIT message is sent (step 1948) to notify the MIP side that the old CoA may be deregistered. Optionally, the old layer 2 connection may be resolved by the MIH_MACORDER message (steps 1950 and 1952).

20A and 20B together show a process 2000 for network initiated and network controlled inter-802 handover according to the present invention. While the 802.X session is in progress, a data path exists between the WTRU 110 and the IEEE 802.X AN (step 2002). The measurements of the MAC / PHY are sent to the MIH function of the IEEE 802.X AN by the MIH_PHY_EVENT message (step 2004). Telemetric measurements from the WTRU 110 may also be communicated to the IEEE 802.X network (steps 2006-2010).

The MIH LLCF processes the measurements (step 2012). For example, the MIH LLCF may average some measurements and compare them with thresholds to generate triggers to indicate MIH handover function. The MIH handover function determines whether handover is necessary based on the information it takes from network information services and measurement reports (step 2014). To make wise decisions, the MIH handover function maintains information from the system information update (eg, neighbor list and information of neighbor networks). The MIH handover function makes preventive handover decisions in two stages of preparation and execution. Different thresholds and decision making algorithms may be used for these two steps.

If the MIH handover function determines that handover is imminent, the MIH handover function triggers handover preparation procedures for the network by sending HOF_PREPARE messages in both MIP and MAC / PHY (steps 2016, 2020). Both MIP and Layer 2 begin to prepare for handover. At the upper layer, the IEEE 802.X AG sends the MIP context to the IEEE 802.Y AG, and at layer 2, the WTRU 110 establishes a new layer 2 link with the IEEE 802.Y network (step 2018). A P2P message is sent from the MIH handover function of IEEE 802.X AN to the MIH handover function at WTRU 110 (step 2022), and the WTRU prepares for a lower layer connection with the IEEE 802.Y network (step 2022). Step 2024).

While the context is being sent to the IEEE 802.Y network, data may be transferred from the IEEE 802.X AG to the IEEE 802.Y AG (step 2026). This allows the WTRU 110 to receive user data before the new CoA is negotiated with the IEEE 802.Y router. The WTRU 110 negotiates with the new CoA using existing MIP messages (step 2028). With the new CoA ready and the lower layer connection established, the user data path is now switched to the IEEE 802.Y network (steps 2030 and 2032).

The MIH handover function continues to process the information and check if the handover should be executed. When the HO decision is performed by the MIH handover function, the MIH handover function sends a HOF_COMMIT message to the MIP (step 2034). The trigger is also sent to the MIH peer of the WTRU 110 (step 2036). Upon receipt of the MIH handover execution command, the old CoA may be deregistered. Optionally, the MIH handover function may transmit MIH_MACORDER to resolve the old layer 2 connection (steps 2038 and 2040).

The present invention implements a fast handover protocol in MIH. One of the goals of the fast handover protocol is to overcome the delay due to MIP registration, and the basic idea is to anticipate the movement with the help of the link layer (triggers). This means preparing the network in advance and requires the expected handover to be initiated by the WTRU 110 and the network. This is accomplished by starting the registration process just before the actual handover.

21 shows a process 2100 for inter-802 fast handover of a WTRU initiated type in accordance with the present invention. The WTRU 110 requests information about its neighbors by the router discovery proxy (step 2102). This is used to build an internal list for neighboring APs in the WTRU 110. The WTRU 110 receives, by a router advertisement message, information about its peripheral APs (such as IP and MAC addresses, operating frequency and ESSID information) (step 2104). The WTRU 110 conveys that information to the MIH via a pre-established link between the MIH (not shown) and the MIP.

The MIH LLCF processes the measurements (step 2106) and the MIH handover function performs a handover evaluation (step 2108). If the MIH handover function determines a handover, the MIH handover function sends a MIH_HANDOVER_PREPARE trigger to the MIP entity (step 2110), which is confirmed by the MIH_HANDOVER_PREPARE response message (step 2116). The WTRU 110 obtains a new CoA (step 2112).

A fast binding update (FBU) is a message from the WTRU 110 that instructs the (preceding) AR of the WTRU 110 to begin directing its traffic to the new AR. The FBU is constructed using the information extracted from the Router Advertisement message and sent after receiving MIH_HANDOVER_PREPARE (step 2114). The purpose of the FBU message is to authorize the preceding AR to bind the (priority) CoA to the new CoA.

After receiving the FBU, the preceding AR starts the procedures for handover and tunnel creation. A handover initiation message, an Internet Control Message Protocol (ICMPv6) message, is sent by the preceding AR to the new AR to trigger the handover process (step 2118). A HACK (handover acknowledge) is an ICMPv6 message sent by the new AR to the preceding AR as a response to the handover initiation message (step 2120). A Fast Binding Acknowledge (FBACK) message is sent by the preceding AR to the new AR and to the WTRU 110 for information purposes after the preceding AR receives the HACK from the new AR to confirm receipt of the FBU message (steps). 2122, 2126). A temporary tunnel is established between the preceding AR and the new AR (step 2124).

The IP routing information is sent from the MIP entity to the MIH handover function (step 2128), the MIH handover function sends a MIH_HANDOVER_COMMIT message to the MIP entity, and the WTRU 110 blocks the connection with the preceding AR (step). 2130). Then, the preceding AR begins to deliver packets to the new AR (step 2132). To introduce itself to the new AR, and as soon as the WTRU 110 regains connectivity, the WTRU 110 sends a Fast Neighbor Advertisement (FNA) message to the new AR (step 2134). The handover is complete and packets are now forwarded from the new AR to the WTRU 110 (step 2136).

22 illustrates a process 2200 for implementing Hierarchical MIPv6 (HMIPv6) using an inter-802 fast handover message flow in accordance with the present invention. This provides localized mobility management to reduce signaling load and handover delay. The global mobility concept refers to a situation in which the WTRU 110 changes its regional care of address (RCoA) by moving from one mobile anchor point (MAP) to another. A typical scenario in the local mobility case is the WTRU 110 moving in the same MAP area but changing from one AR to another. This type of local handovers are managed locally and transparently to the corresponding hosts of the WTRU.

The WTRU 110 receives a router advertisement from the new MAP to which it has moved (step 2202). This notification contains the global address of the MAP. Based on the prefix received at the MAP option, the WTRU 110 forms a new RCoA characteristic for its MAP. Router advertisements, along with the WTRU's measurement results, are delivered to the MIH by a pre-established link between the MIH and the MIP. The MIH LLCF analyzes these measurements (step 2204). The MIH handover function performs handover evaluation (step 2206). If the MIH handover function determines that a handover is necessary or desirable (step 2208) and it is confirmed by the HANDOVER_PREPARE.Response message (step 2212), the MIH handover function sends a HANDOVER_PREPARE.Indication trigger to the MIP. The WTRU 110 obtains CoAs, RCoA, and On-Link Care of Address (LCoA) (step 2210).

Upon receipt of the MIH_HANDOVER_PREPARE.Indication trigger, the MIP initiates a pre-binding procedure to transmit the LBU to the preceding MAP as an LCoA to reduce packet loss and perform fast handover (step 2211). This is done according to the make-before-break principle. At this point, the MIH_HANDOVER_COMMIT.Indication trigger is sent by the MIH to the MIP (step 2214), which is confirmed by the MIH_HANDOVER_COMMIT.Response message (step 2216).

Upon receiving the trigger indicating handover, the WTRU 110 transmits a BU (Binding Update) to the new MAP (step 2218). This message includes a "Home Address" option that includes RCoA. This BU binds the WTRU's RCoA to its LCoA.

The MAP sends a BACK to the WTRU 110 (step 2220) and the MIP entity sends IP routing information to the MIH handover function (step 2222). Then, a bidirectional tunnel is established between the WTRU 110 and the new MAP (step 2224).

As soon as registration with the new MAP is confirmed, the WTRU registers its new RCoA with the HA by sending a BU specifying the binding to the HA 142 (step 2226).

This step is part of the MIPv6 route optimization method. A BU similar to the BU in the preceding step is also sent to the CoN 140 of the WTRU (step 2228). This allows CoN 140 to establish a link with the new MAP to send packets directly to the new MAP (step 2230).

While the features and elements of the present invention have been described in certain embodiments of specific combinations, each feature or element may be used alone or with other features and elements of the present invention without the remaining features and elements of the preferred embodiments. It can be used in various combinations, with or without.

The present invention enables seamless handover between multiple heterogeneous networks.

Claims (22)

A wireless communication system for performing media independent handover (MIH), A plurality of access networks simultaneously used according to different standards and each comprising a MIH processor, the MIH processor comprising: first acquiring means for acquiring information about system conditions and network topology, and a current access network upon receipt of a MIH trigger; A first handover means for performing a handover from the user to another access network; At least one multi-stack wireless transmit / receive unit (WTRU) configured to support multiple wireless standards, A user plane; In response to triggers received from the user side, a MIH management side in communication with the user side to manage handovers between the WTRU and different ones of the access networks. Protocol stack processor with The at least one multi-stack wireless transmit / receive unit (WTRU); Including, The protocol stack processor further includes second acquiring means for acquiring information regarding system conditions and network topology, and second handover performing means for performing a handover from the current access network to another access network upon receipt of a MIH trigger. To include, Wireless communication system. A system for performing media independent handover (MIH), A plurality of IEEE 802.X networks; A plurality of third generation partnership project (3GPP) networks used simultaneously with the IEEE 802.X networks; At least one wireless transmit / receive unit (WTRU) configured to access both the IEEE 802.X networks and the 3GPP networks Including, The WTRU includes a MIH processor for performing handover between the IEEE 802.X networks and 3GPP networks, The WTRU is User side; In response to triggers received from the user side, a MIH management side in communication with the user side to manage handovers between the WTRU and different ones of the access networks. Protocol stack processor with To further include, system. The method of claim 2, wherein the WTRU, Reading means for reading MIH information transmitted from one of the IEEE 802.X networks; Triggering means for triggering 3GPP authentication and authorization procedures based on the MIH information; Obtaining means for obtaining a local IP (Internet protocol) address; Establishing means for establishing a tunnel to a packet data gateway (PDG) of the 3GPP core network; Configuration means for constructing a care of address (CoA); Registration means for registering the CoA with a home agent of the WTRU, wherein the data for the WTRU is routed via the home agent through a new tunnel established between the home agent and an external agent based on the CoA , The registration means To include, system. As a wireless communication system, A plurality of technically diverse access networks; At least one multi-stack wireless transmit / receive unit (WTRU) including processing means for processing a protocol stack using processing means for processing media independent handover (MIH) Including, Processing means for processing the protocol stack comprises a user side; In response to triggers received from the user side, having a media independent handover (MIH) management surface in communication with the user side to manage handovers between the WTRU and different ones of the access networks, The WTRU is, Scanning means for scanning the access network; Detecting means for detecting frames transmitted by the access network; Reading means for reading contents of the detected beacon frames if it is determined that the beacon frames support MIH information; Delivery means for delivering MIH information found in the beacon frames to processing means for processing the MIH Including, The processing means for processing the MIH includes processing means for processing the MIH information and establishing means for establishing a communication link with the access network. Wireless communication system. 5. The system of claim 4 wherein the WTRU and the access networks implement a fast handover procedure in accordance with mobile Internet protocol version 6 (MIPv6). The method of claim 5, Further includes the current access router (AR), The WTRU comprises transmitting means for sending a router discovery message to the current AR, The current AR comprises sending means for sending a router advertisement message to the WTRU, The WTRU comprises determining means for performing measurements for a new AR and making a handover decision, The WTRU includes obtaining means for obtaining a new care of address (CoA), The WTRU comprises transmitting means for sending a fast binding update to the current AR, A tunnel is established between the current AR and the new AR, and packets are delivered through the new AR. Wireless communication system. The system of claim 4 wherein the WTRU and the access networks implement a hierarchy mobile internet protocol version 6 (HMIPRv6). The method of claim 4, wherein A current mobile anchor point (MAP) for sending a Router Advertisement message to the WTRU, The WTRU comprises receiving means for receiving the router advertisement message from the current MAP, Processing means for processing the MIH of the WTRU includes measuring means for performing measurements for a new MAP, and determining means for making a handover decision, The WTRU comprises acquiring means for acquiring a care of address (CoA), The WTRU comprises transmitting means for sending a local binding update to the current MAP, The WTRU comprises transmitting means for sending a binding update to the new MAP, The WTRU includes establishing means for establishing a tunnel between the WTRU and the new MAP; The WTRU comprises registration means for registering the CoA with a home agent, The WTRU comprises transmitting means for sending a local binding update to a core network, That the packet is delivered through the new MAP Wireless communication system. delete delete delete delete delete delete delete delete delete delete delete delete delete delete

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