WO2011023052A1 - 一种切换方法和切换设备 - Google Patents

一种切换方法和切换设备 Download PDF

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Publication number
WO2011023052A1
WO2011023052A1 PCT/CN2010/075544 CN2010075544W WO2011023052A1 WO 2011023052 A1 WO2011023052 A1 WO 2011023052A1 CN 2010075544 W CN2010075544 W CN 2010075544W WO 2011023052 A1 WO2011023052 A1 WO 2011023052A1
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WIPO (PCT)
Prior art keywords
access network
user equipment
switching
switching server
server
Prior art date
Application number
PCT/CN2010/075544
Other languages
English (en)
French (fr)
Inventor
杨永利
丁志明
树贵明
Original Assignee
华为终端有限公司
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
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to RU2012111809/07A priority Critical patent/RU2503147C2/ru
Priority to JP2012525869A priority patent/JP5376185B2/ja
Priority to KR1020127007465A priority patent/KR101399004B1/ko
Publication of WO2011023052A1 publication Critical patent/WO2011023052A1/zh
Priority to US13/407,228 priority patent/US20120157102A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/08Reselecting an access point
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/0005Control or signalling for completing the hand-off
    • H04W36/0011Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016Hand-off preparation specially adapted for end-to-end data sessions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W88/00Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02Terminal devices
    • H04W88/06Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/13Cell handover without a predetermined boundary, e.g. virtual cells
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W36/00Hand-off or reselection arrangements
    • H04W36/14Reselecting a network or an air interface

Definitions

  • the invention relates to a Chinese patent application filed on August 28, 2009, with the application number of 200910171407.X, the invention name is "a switching method and switching device", and the application submitted on November 20, 2009 No. 200910225384.6, Chinese patent application entitled “A Switching Method and Switching Device”, and Chinese Patent Application No. 201010116555.4, entitled “Switching Method and Switching Device”, filed on February 10, 2010 Priority of the application, the entire contents of which are incorporated herein by reference.
  • the present invention relates to the field of communications technologies, and in particular, to a switching method and a switching device used by a multimode user equipment in a single radio frequency switching mode. Background technique
  • a multimode user equipment in a single radio switching mode from one access network to another, usually needs to find a suitable switching server to establish a tunnel with it, and then authenticate and densely pass through the tunnel and the target access network. After the key is negotiated, radio switching is performed to complete the network access process on the target access network.
  • WiMAX Worldwide Interoperability for
  • Microwave Access the global interoperability of microwave access, is a wireless metropolitan area network (WMAN) access technology with a signal transmission radius of 50 kilometers, which can basically cover the suburbs.
  • WiFi Wireless Fidelity
  • WLAN wireless local area network
  • WiFi is used as a supplement to WiMA. It is a good choice to use WiFi in a weak WiMAX signal indoor or densely populated location, but due to WiFi. The coverage is small. After the user equipment switches to the WiFi access network, it may soon switch back to the WiMAX access network from the WiFi access network.
  • the user equipment is from the first The access network (for example, WiMAX) switches to the second access network (for example, WiFi), and then switches back to the first access network, and needs to re-authenticate and key negotiation process, and the efficiency of doing so is undoubtedly very low.
  • the access network for example, WiMAX
  • WiFi Wireless Fidelity
  • the embodiment of the present invention provides a handover method and a handover device, so that a multi-mode user equipment in a single radio frequency switching mode can quickly switch back to the original first access network after switching from the first access network to the second access network. .
  • the user equipment After the second access network completes the network access, the user equipment establishes a tunnel with the first access network switching server, and interacts with the first access network switching server through the tunnel to perform the first access.
  • the network switch server is attached, and enters an idle mode of the first access network;
  • the embodiment of the invention further provides a handover method, including:
  • the user equipment acquires an IP address of the first access network switching server
  • the user equipment establishes an IP tunnel with the first access network switching server, and interacts with the first access network switching server by using the tunnel to perform a service from the service site of the user equipment in the first access network. Switching of the switching server;
  • a switching server acquiring unit configured to acquire an address of the first access network switching server when the user equipment switches from the first access network to the second access network;
  • An attachment point switching unit configured to switch an attachment point of the user equipment from the first access network service station to the first access network switching server;
  • a switchback preparation unit configured to establish a tunnel with the first access network switching server after the second access point completes the network access, and interact with the first access network switching server by using the tunnel Attaching to the first access network switching server, and entering an idle mode of the first access network
  • a switchback unit configured to switch back from the second access network to the first access by a user equipment At the time of the network, attaching is performed on the target site of the first access network to exit the idle mode and re-access the first access network.
  • the embodiment of the invention further provides a switching device, including:
  • a switching server IP address obtaining unit configured to acquire an IP address of the first access network switching server before or after the user equipment switches from the first access network to the second access network;
  • a re-entry switching unit configured to establish an IP tunnel with the first access network switching server after the user equipment is switched from the first access network to the second access network, and switch the server re-entry from the first access network through the tunnel
  • the first access network triggers the first access network to switch the attachment point of the user equipment from the first access network service station to the first access network switching server;
  • An idle mode control unit configured to: after the user equipment completes the handover from the first access network service station to the first access network, by using the tunnel, interacting with the first access network switching server by using the tunnel Entering an idle mode of the first access network;
  • a switchback unit configured to: when the user equipment switches back from the second access network to the first access network, Attaching to the target site of the first access network to exit the idle mode and re-enter the first access network.
  • the state of the user equipment in the first access network is set to an idle mode, so that The first access network retains context information of the user equipment after the user equipment switches to the second access network, and when the user equipment switches back from the second access network to the first When accessing the network, attaching directly to the target site of the first access network, re-entering the first access network in a manner of exiting the idle mode, and completing from the second access network to the first
  • the switching of the access network does not have to go through the process of pre-authentication, key distribution, etc. of the first access network, and the steps are small, so that the multi-mode user equipment in the single radio frequency switching mode is from the first After the access network switches to the second access network, it can quickly switch back to the original first access network.
  • FIG. 1 is a flowchart of a handover method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a complete process of a handover method according to an embodiment of the present invention
  • FIG. 3 is a flowchart of still another handover method according to an embodiment of the present invention.
  • FIG. 5 is a functional unit diagram of a switching device according to an embodiment of the present invention.
  • FIG. 6 is a functional unit diagram of a switching device according to another embodiment of the present invention.
  • FIG. 7 is a flowchart of a third handover method according to an embodiment of the present invention.
  • FIG. 8 is a flowchart of a complete process of a third handover method according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a third switching device according to an embodiment of the present invention. detailed description
  • the multi-mode user equipment operating in the single radio frequency switching mode is currently connected to the core network of the first access network through the first access network.
  • a certain trigger condition is met, the access to the second access network needs to be switched.
  • the mode is to switch to the core network accessing the first access network through the second access network.
  • the certain triggering condition may be that the user equipment finds that the signal of the first access network is weak, and automatically decides to switch to the second access network, or the user actively operates the user equipment to switch to the second access network, or may be The network requires the user equipment to switch to the second access network.
  • the user equipment When the user equipment is switched from the first access network to the second access network, because the user equipment is working in the single radio frequency switching mode, the user equipment may first turn off the radio of the first access network and then turn on the radio of the second access network.
  • This method is strictly single-issue single-issue mode, that is, only one RF circuit is working at any time.
  • the user equipment may also turn on the radio of the second access network and then turn off the radio of the first access network. Before the radio of the first access network is turned off, the radio of the second access network is only used for listening, which is a dual-receipt mode. Also belongs to the single RF mode of operation.
  • the user equipment must turn off the radio of the first access network once it decides to send information through the radio of the second access network, at least prohibiting the transmission of the radio of the first access network.
  • a handover method provided by an embodiment of the present invention includes:
  • the methods of obtaining include, but are not limited to, the following:
  • the user equipment is configured by Dynamic Host Configuration Protocol (DHCP), or by the Domain Name System (DNS), or by requesting an IP address when initially entering the network.
  • DHCP Dynamic Host Configuration Protocol
  • DNS Domain Name System
  • the address of the first access network switching server is obtained by querying a dedicated information server.
  • the so-called attachment point refers to a site that is associated with and provides service to the user equipment.
  • the attachment point is the base station registered by the user equipment.
  • the service site refers to a base station or an access point that communicates with user equipment through radio frequency.
  • the first access network is a WiMAX access network
  • the attachment point of the user equipment is switched from the first access network service station to the first access network switching server, including:
  • the user equipment sends a handover request message to the WiMAX monthly service base station, and the WiMAX monthly service base station exchanges handover related information with the WiMAX handover server; the user equipment receives the handover response message returned by the WiMAX service base station by using the first access network service station. According to the handover response message, the user equipment sends a handover indication message to the WiMAX serving base station, and the WiMAX serving base station sends a handover confirmation message to the WiMAX handover server.
  • WiMAX is used as the first access network as an example, the handover process of the WiMAX service base station to the WiMAX switching server is described.
  • the WiMA switching server is equivalent to the virtual base station here. If it is another network such as the 3GPP access network, its handover process from the service site to the handover server is similar to this, and is not described here.
  • the user equipment After the second access network completes the network access, the user equipment establishes a tunnel with the first access network switching server, and interacts with the first access network switching server through the tunnel, and performs the first The access network switches the attachment of the server and enters an idle mode of the first access network.
  • the first access network still retains the context information of the user equipment, when the user equipment When the two access networks switch back to the first access network, it is not necessary to go through the process of discovery, authentication, and key distribution of the first access network switching server. Therefore, after the second access point completes the network access, the user equipment only needs to establish a tunnel directly with the first access network switching server, and interact with the first access network switching server through the tunnel to perform the interaction. The first access network switches the server's attachment and enters the idle mode of the first access network.
  • the WiMAX switching server works as a virtual base station.
  • the user equipment first performs a ranging process with the virtual base station through the tunnel, and the ranging process is the first step of the WiMAX access process. After the ranging is completed, the user equipment is attached to the process without authentication, key distribution, and the like. On the virtual base station. At this time, the user equipment may send a deregistration request to the virtual base station through the tunnel. After receiving the deregistration response returned by the virtual base station, the user enters the idle mode, and the idle mode is entered for the user equipment to quickly switch back. WiMAX radio is ready.
  • a message is periodically sent to the first access network switching server through the tunnel to keep the user equipment in the first access network. Idle mode.
  • the WiMAX network is taken as an example.
  • a user terminal sends a location update message (Location Update) to the network to maintain the idle mode of the user equipment.
  • Location Update Location Update
  • other messages may be sent to maintain.
  • the purpose of idle mode In other networks, the idle mode described in the WiMA network may also be referred to as a sleep state, a power saving mode, or the like.
  • the step specifically includes: selecting, by the user equipment, the first access network target station by intercepting or querying; removing the tunnel between the first access network switching server; and turning off the second access network radio, opening the first connection Incoming radio frequency; performing a ranging procedure of exiting the idle mode on the first access network target station.
  • the first access network is a WiMAX access network.
  • the user equipment sends a ranging request message to the selected target base station, and uses the parameter to specify to exit the idle mode in the request message. Re-entry of the target base station.
  • the specific exit idle mode method is similar, here is not - enumeration description.
  • the switching method provided by the embodiment of the present invention acquires the address of the switching server of the first access network when the user equipment switches from the first access network to the second access network; before the user equipment switches to the second access network And the user equipment in the first network is switched from the service station to the switching server of the first access network; after the user equipment switches to the second access network and completes the network access process in the second access network,
  • the user equipment establishes a tunnel with the switching server of the first access network, and interacts with the first access network switching server through a tunnel, performs attachment to the first access network switching server, and enters the The idle mode of the first access network is then attached at the target site of the first access network to exit the idle mode and re-access the first access network.
  • the first access network still retains the context information of the user equipment, and when the user equipment needs to switch back to the first access network from the second access network, the radio frequency can be directly switched.
  • the re-entering process of the first access network is completed by exiting the idle mode from the selected first access network target station.
  • the following describes the handover method embodiment provided by the present invention by switching the user equipment from the WiMAX access network to the WiFi access network and then switching back to the complete process of the WiMAX access network.
  • the handover between WiMAX and WiFi is taken as an example here.
  • the method provided by the present invention is not limited to the handover between WiMAX and WiFi, and is also applicable to other types of first access network and second access. Switching between networks.
  • the complete processing procedure of the handover method provided by the embodiment of the present invention includes:
  • Step 1 The user equipment searches for an available WiFi switching server and a WiMAX switching server available to the WiMAX Access Service Network (ASN). If this process is completed when the user equipment initially enters the network, this step is not required.
  • ASN WiMAX Access Service Network
  • the WiFi network also uses the switching server, so the user equipment acquires the switching server information of WiMAX and WiFi together, and in fact whether the WiFi network uses the switching server is independent of the switching method provided by the present invention.
  • Step 2 Establish a tunnel between the user equipment and the WiFi switching server.
  • the WiFi switching server acts as a virtual AP.
  • the packets between the user and the user equipment are tunneled.
  • the data format in the tunnel can be: IP header, tunnel header, and 802.11.
  • MAC (Media Access Control) frame (802.11 MAC Frame), where the IP address is the IP address of the WiFi switching server that can be addressed on the public network, and the IP address of the user equipment; the Tunnel header depends on the tunneling protocol used. If the Generic Routing Encapsulation (GRE) is used, the Bayer 1 J is the GRE header; the 802.11 MAC Frame is the WiFi radio module of the user equipment and the 802.11 format MAC frame generated by the WiFi switching server.
  • GRE Generic Routing Encapsulation
  • Step 3 The user equipment completes the initial network access process of the WiFi access network on the WiFi switching server (virtual AP).
  • open system authentication is performed between the user equipment and the virtual AP.
  • the open system authentication consists of two messages: The user equipment sends a request message containing its own ID to the virtual AP, and the virtual AP directly returns Send a successful response message. The user device then associates with the virtual AP. Then, the 802.1x Extensible Authentication Protocol (EAP) authentication is performed between the user equipment and the authenticator of the WiFi access network.
  • EAP Extensible Authentication Protocol
  • the user equipment passes the authentication certificate to the authenticator of the virtual AP through the tunnel, and the master session key (MSK) is established between the user equipment and the authentication server.
  • the authentication server passes the MSK to the authenticator of the virtual AP.
  • a handshake is established between the user equipment and the authenticator of the virtual AP to establish a PTK (paired temporary key).
  • Step 4 The user equipment and the WiFi access point perform a pre-authentication process.
  • the pre-authentication process with the WiFi access point is started according to the pre-authentication process in the 802.11-2007 specification.
  • the user equipment sends an 802.1X LAN-based Extensible Authentication Protocol over LAN (EAPOL) Start (Start) message to the virtual AP using the PTK established with the authenticator of the virtual AP, and the DA in the MAC frame (target) Address) Fill in the basic Service Set Identifier (BSSID) of the target AP, and fill in the MAC address of the virtual AP by the RA (receiver address).
  • the virtual AP queries the IP address of its corresponding authenticator according to the BSSID of the DA.
  • a tunnel is then established with the authenticator of this IP address to perform authentication data interaction.
  • the result of the pre-authentication is that a Pairwise master key security alliance (PMK SA) is established between the user equipment and the target AP.
  • PMK SA Pairwise master key security alliance
  • the process flow assumes that when WiMAX switches to WiFi, the pre-authentication is performed through the WiFi switching server, and then the radio frequency is switched. In fact, whether the WiFi network pre-authentication process is performed when switching to WiFi is not related to the switching method provided by the present invention.
  • Step 5 The user equipment is removed and the tunnel between the WiFi switching servers.
  • Step 6 The user equipment sends a handover request message to the WiMAX serving base station, and switches to the virtual base station of the WiMAX switching server.
  • the step is specifically: the user equipment sends a handover request message to the WiMAX service base station, and the WiMAX service base station exchanges handover related information with the WiMAX handover server; and receives, by the first access network service station, a handover response message returned by the WiMAX service base station; According to the handover response message, the user equipment sends a handover indication message to the WiMAX monthly service base station, and the WiMAX monthly service base station sends a handover confirmation message to the WiMAX handover server.
  • This step can be performed in synchronization with the processes in steps 2 to 5, but the user equipment sends a handover indication message to the serving base station after step 5.
  • Step 7 The user equipment turns off the WiMAX radio and turns on the WiFi radio.
  • Step 8 The user equipment completes the re-association process with the target AP.
  • the Robust security network information element (RSNIE) in the Reassociation Request of the user equipment contains the information established in step 4.
  • PMKID PMK identification
  • the two parties After the PMK, the two parties perform a 4-way handshake to obtain the paired temporary key PTK, thus completing the target.
  • the access process of the AP completes the network access process in the WiFi access network.
  • Step 9 The user equipment performs a mobile internet protocol MIP registration process.
  • Step 10 The user equipment establishes a tunnel with the WiMAX switching server on the WiFi data path.
  • the tunnel is a three-layer tunnel established with the WiMAX switching server on the WiFi data path, that is, the user equipment performs message interaction with the WiMAX switching server on the IP layer, that is, the third layer (the link layer is the second layer).
  • the Layer 2 packet sent by the device to the WiMAX switching server is transmitted as the data of the IP packet in the WiFi access network.
  • Step 11 The user equipment completes the ranging process with the WiMAX switching server in the tunnel. This step is the next step of step 6. After the ranging is completed, the user equipment is attached to the virtual base station.
  • Step 12 The user sends a deregistration request to the WiMAX switching server in the tunnel to enter the idle state. Operating mode.
  • the handover from the WiMAX access network to the WiFi access network is completed, and the context information of the user equipment in the WiMAX access network is retained.
  • Step 13 When the user equipment works in the WiFi access network, in order to maintain the idle mode of the WiMAX access network, a location update message (Location Update) is periodically sent to the WiMAX switching server through the tunnel.
  • Location Update Location Update
  • Step 14 The user equipment is removed from the tunnel between the WiMAX switching server.
  • Step 15 The user equipment turns off the WiFi radio and turns on the WiMAX radio.
  • Step 16 The user equipment performs a ranging and re-entering process on the WiMA target base station. This is a process of exiting the idle mode.
  • Step 17 The user equipment performs a mobile internet protocol MIP registration process.
  • the user equipment is quickly switched back to the WiMAX access network, so that the user's current session is maintained.
  • the handover method provided in this embodiment switches from the WiMAX serving base station to the WiMAX through the attachment point of the user equipment before handover when the user equipment switches from the WiMAX access network to the WiFi access network.
  • Switching the server after the handover from the WiMAX access network to the WiFi access network is completed, attaching to the WiMAX switching server through the WiFi tunnel, and entering the idle mode, so that the WiMAX access network still retains the context information of the user equipment, when the user When the device is switched back to the WiMAX access network from the WiFi access network, the process of pre-authentication and key distribution of the WiMAX access network does not need to be re-authenticated, and the steps are small, so that the multi-mode user equipment in the single radio switching mode is connected from the WiMAX. After switching to the WiFi access network, the network can quickly switch back to the original WiMAX access network.
  • FIG. 3 is a schematic diagram of a handover method according to another embodiment of the present invention, including:
  • the user equipment acquires an IP address of the first access network switching server.
  • the user equipment In order to establish an IP tunnel with the handover server of the first access network in the second access network, the user equipment needs to obtain an IP address of the handover server of the first access network, which may be in the user equipment. Obtained before switching to the access network, and may also be obtained after switching to the second access network, and the specific obtaining manner may use a DNS protocol, a DHCP protocol, or a query for a dedicated information server, etc., which is not described in detail herein.
  • S320 after the user equipment switches to the second access network, establish an IP tunnel with the first access network switching server, and interact with the first access network switching server by using the tunnel to perform the first access. Switching from the service site of the user equipment to the switching server in the network.
  • the service site refers to the first access network access point that the user equipment serves for the user equipment before switching to the second access network.
  • the service site is originally The base station served by the user equipment.
  • the user equipment When the user equipment switches from the first access network to the second access network, it does not send any related to the second access network to switch or request the first access network to retreat in the first access network.
  • the message of the network so the first access network temporarily retains the context information of the user equipment, and the user equipment can directly send a handover request to the target site, for example, the handover server, to switch the attachment point from the service site to the target site.
  • the handover process of the user equipment from the first access network service station to the first access network switching server is: the user equipment passes the second access network.
  • the tunnel established in the medium sends a ranging request message to the first access network switching server, where the ranging request message includes the identification information of the service station of the user equipment, and the measurement sent by the user equipment in this case
  • the request will serve as a switch request.
  • the user equipment can also send it at this time.
  • the handover request message has different specific implementation methods in different networks; after receiving the ranging request, the first access network switching server obtains the information from the access gateway and the service site of the user equipment. Context information of the user equipment (not shown in FIG.
  • the first access network switching server sending a ranging response message to the user equipment, and instructing completion of the handover;
  • the first access network switching server interacts with the service site of the user equipment to confirm that the handover is completed.
  • WiMAX is used as the first access network as an example, the handover process of the WiMAX service base station to the WiMAX handover server is described.
  • the WiMAX handover server is equivalent to the virtual base station here, and is the handover target base station. If it is another network such as the 3GPP access network, the handover process from the service site to the handover server is similar to this, and is not described here.
  • the present invention does not pay attention to the manner in which the tunnel between the user equipment and the first access network switching server is specifically established.
  • the user equipment sends a deregistration request to the virtual base station through a tunnel with the first access network switching server, in the deregistration request message. Instructing to enter an idle mode; after receiving the de-registration response returned by the virtual base station, the user equipment enters an idle mode of the first access network.
  • the message is periodically sent to the first access network switching server through the tunnel to keep the user equipment in the first Idle mode in the access network.
  • the WiMA network is taken as an example.
  • the user equipment sends the location update message (Location Update) to the network to maintain the idle mode of the user equipment.
  • Location Update Location Update
  • other messages may be sent to maintain.
  • the purpose of idle mode In other networks, the idle mode described in the WiMAX network may also be referred to as a sleep state, a power saving mode, or the like.
  • the step specifically includes: selecting, by the user equipment, the first access network target station by intercepting or querying; removing the tunnel between the first access network switching server; and closing the second access network Radio frequency, the first access network radio is turned on; the ranging process of exiting the idle mode is performed on the first access network target station.
  • the first access network is a WiMAX access network.
  • the user equipment sends a ranging request message to the selected target base station, and uses the parameter to specify to exit the idle mode in the request message. Re-entry of the target base station.
  • the specific exit idle mode method is similar, here is not - enumeration description.
  • the switching method provided by the embodiment of the present invention, after the user equipment switches from the first access network to the second access network, establishes a tunnel with the first access network switching server; and the first access through the tunnel
  • the network switching server performs an interaction, and performs a handover from the serving site of the user equipment to the switching server in the first access network; and enters the idleness of the first access network from the switching server by using the tunnel a mode; when the user equipment switches back from the second access network to the first access network, attaching on a target site of the first access network to exit the idle mode and re-access the First access. Therefore, when the user equipment switches to the second access network, the first access network still retains the upper and lower sides of the user equipment.
  • the radio equipment can be directly switched, and the idle mode is exited from the selected first access network target station, that is, the first access network is completed. Re-entering process. Compared with the prior art, it is not necessary to re-pass the pre-authentication, key distribution, and the like of the first access network, and the steps are less, so that the multi-mode user equipment in the single radio frequency switching mode is switched from the first access network to the second. After accessing the network, it can quickly switch back to the original first access network.
  • the handover between WiMAX and WiFi is taken as an example here.
  • the method provided by the present invention is not limited to the handover between WiMAX and WiFi, and is also applicable to other types of first access network and second access. Switching between networks.
  • a complete processing procedure of a handover method includes: Step 401: A user equipment searches for an available WiFi handover server.
  • the WiFi network also uses a switching server.
  • Step 402 Establish a tunnel between the user equipment and the WiFi switching server.
  • the WiFi switching server acts as a virtual AP, and the network between the user and the user equipment is tunneled.
  • Step 403 The user equipment completes a pre-networking process of the WiFi access network by using a tunnel to the WiFi switching server (virtual AP), and includes a handover process from the virtual AP to the real target AP.
  • the WiFi switching server virtual AP
  • the single radio frequency handover procedure from the first access network to the second access network is not related to the present invention, and therefore the process of switching from the WiMAX access network to the WiFi access network is not described in detail herein.
  • Step 404 The user equipment is removed and the tunnel between the WiFi switching server.
  • Step 405 The user equipment turns off the WiMAX radio and turns on the WiFi radio.
  • Step 406 The user equipment completes a re-association process with the target AP, and completes re-entering the WiFi from the air interface.
  • the internet The internet.
  • Step 407 The user equipment performs a mobile internet protocol MIP registration process. After this step is completed, the application connection that the user device is in is switching to the WiFi network.
  • Step 408 The user equipment obtains an IP address of the WiMAX switching server by using a DNS, a DHCP, and an information server. This step can also occur before the user equipment switches to the WiFi network, such as with the WiFi SFF information at step 401.
  • Step 409 The user equipment establishes an IP tunnel with the WiMAX switching server. Since the user equipment is currently working in the WiFi network, this tunnel passes through the WiFi network.
  • the tunnel is an IP tunnel. That is to say, the user equipment exchanges messages with the WiMAX switching server at the IP layer, and the WiMAX air interface packets between the user equipment and the WiMAX switching server are transmitted as data in the IP packet.
  • Step 410 The user equipment completes the ranging process with the WiMAX switching server in the tunnel, and performs network reentry.
  • the ranging request message sent by the user equipment to the WiMAX switching server includes the identifier of the serving base station of the user equipment.
  • the WiMAX switching server finds that there is no information about the device, obtains its context information from the serving base station of the device, and obtains other information such as a new authorization key from the access gateway, and completes Preparation for switching such as path establishment.
  • the WiMAX switch server completes the handover preparation, it returns a ranging response message to the user equipment, indicating that the network re-entry is successful.
  • the WiMAX switching server also sends a handover complete message to the original serving base station of the user equipment, and the original serving base station can release the context information of the user equipment.
  • Step 411 The user sends a registration request to the WiMAX switching server in the tunnel, and enters an idle working mode.
  • Step 412 When the user equipment works in the WiFi access network, in order to maintain the idle mode of the WiMAX access network, a location update message (Location Update) is periodically sent to the WiMA switching server through the tunnel.
  • Location Update Location Update
  • Step 413 The user equipment tears down the tunnel between the WiMA switching server.
  • Step 414 The user equipment turns off the WiFi radio and turns on the WiMAX radio.
  • Step 415 The user equipment performs a ranging and re-entering process on the WiMAX target base station. This is a process of exiting the idle mode. Since the user equipment is in idle mode in the WiMAX network when re-entering the network from the target base station, the target base station does not perform the process as described in step 409, and the main thing to do is to establish a data path, and the process is relatively simple.
  • Step 416 The user equipment performs a mobile internet protocol MIP registration process.
  • the user equipment is quickly switched back to the WiMAX access network, so that the user's current session is maintained.
  • the handover method provided in this embodiment, after the user equipment switches from the WiMAX access network to the WiFi access network, tunnels the attachment point of the user equipment in the WiMAX access network from the serving base station. Switching to the WiMAX switching server, and then switching from the WiMAX switching server to the idle mode, so that the WiMAX access network still retains the context information of the user equipment, and when the user equipment switches from the WiFi access network back to the WiMA access network, directly from the target After the base station exits the idle mode, it is not necessary to re-pass the pre-authentication and key distribution process of the WiMAX access network, and the steps are small, so that the multi-mode user equipment in the single radio switching mode is switched from the WiMAX access network to the WiFi access. After the network, it can quickly switch back to the original WiMAX access network.
  • FIG. 7 is a schematic diagram of a handover method according to another embodiment of the present invention, including: S710.
  • the user equipment switches the first access network service station of the user equipment from the current serving station to the first access network switching service during a handover process from the first access network to the second access network.
  • the user equipment may perform switching from the current serving station to the first access network switching server before using the embodiment shown in FIG. 1 from the first access network to the second access network.
  • the process may be performed by using the tunnel in the second access network from the current serving site to the first interface after the user equipment switches to the second access network, using the embodiment shown in FIG. Switching process of the network switching server.
  • the user equipment does not enter the idle mode of the first access network after switching from the first access network to the second access network. .
  • the user equipment requests the first access server to switch to the target station by using the tunnel of the second access network, and the target station completes the handover preparation work.
  • the user equipment attaches on the target site of the first access network, and completes handover from the first access network switching server to the target site.
  • the user equipment switches to the first access network on the air interface, attaches from the target site that has prepared the handover, and the target station completes the handover from the first access network to the target site.
  • the next steps of switching After this step is completed, all handover procedures from the second access network to the first access network are completed.
  • the user equipment switches the first network service station of the user equipment from the current service station to the first in the process of switching from the first access network to the second access network.
  • An access network switching server before the user equipment switches back from the second access network to the first access network, Performing, by the tunnel, the first access network switching server to perform a handover in the first access network from the switching server to a target site of the user equipment; the user equipment is in the first access network Attachment is performed on the target site, and switching from the first access network switching server to the target site is completed.
  • the first access network still retains the context information of the user equipment, and when the user equipment needs to switch back from the second access network to the first access network, The switching server of the first access network switches to the target site, and completes the process of returning to the first access network.
  • it is not necessary to re-pass the pre-authentication, key distribution, and the like of the first access network, and the steps are less, so that the multi-mode user equipment in the single radio frequency switching mode is switched from the first access network to the second. After accessing the network, it can quickly switch back to the original first access network.
  • the handover between WiMAX and WiFi is taken as an example here.
  • the method provided by the present invention is not limited to the handover between WiMAX and WiFi, and is also applicable to other types of first access network and second access. Switching between networks.
  • a complete processing procedure of a handover method includes: Step 801: A user equipment is handed over from a WiMAX access network to a WiFi access network. This process has been described in detail in the embodiments shown in Figs. 2 and 4, and will not be described again.
  • Step 802 The user equipment completes handover of the serving base station to the WiMAX switching server in the WiMAX in the process of switching from the WiMAX access network to the WiFi access network.
  • This process may use the methods shown in steps 6 and 11 of the embodiment shown in Fig. 2, or the method shown in step 410 in the embodiment shown in Fig. 4.
  • the method of steps 6 and 11 in FIG. 2 is to request the WiMAX serving base station to switch to the WiMAX switching server before the user equipment switches to the WiFi access network, and the WiMAX serving base station and the WiMAX switching server complete the handover preparation work, and then the user equipment goes to the WiMAX. Service base station confirmation Make this switch.
  • the tunnel is attached to the WiMAX switching server to complete the handover process from the serving base station to the switching server.
  • the method shown in step 410 in FIG. 4 is to trigger the WiMAX switching server to perform handover from the serving base station of the user equipment to the WiMAX switching server after the user equipment switches to the WiFi access network and attaches to the WiMAX switching server through the tunnel. process.
  • the user equipment does not enter the idle mode of the WiMAX network after this step.
  • the user equipment may periodically or irregularly send a message, such as a ranging message, to the WiMAX switching server through the tunnel, so that the WiMAX access network knows that the user equipment is on the network, and will not be found after a period of time.
  • the user equipment performs the network retreat process, that is, deletes all the information related to the user equipment, and recovers the resources occupied by the user equipment.
  • the WiMAX switching server can also start a timer. Before the timer expires, even if no message is received from the user equipment, the user equipment will not be retired.
  • Step 803 When the user equipment decides to switch back to the WiMAX network, after determining the handover target base station, performing a handover process from the WiMAX handover server to the selected target base station. This process is the same as step 6 in Figure 2, except that messages between the user equipment and the switching server are sent through tunnels in the WiFi network.
  • Step 804 The user equipment tears down the tunnel between the WiMAX switching server.
  • Step 805 The user equipment turns off the WiFi radio and turns on the WiMAX radio.
  • Step 806 The user equipment performs a process of ranging and re-entering on the WiMAX target base station, that is, attaching to the target base station. After the user equipment attaches to the target base station, the target base station completes a subsequent step of the handover procedure from the handover server to the target base station, which includes notifying the handover server that the terminal has attached to the target base station.
  • Step 807 The user equipment performs a mobile internet protocol MIP registration process.
  • the user equipment is quickly switched back to the WiMA access network, so that the user's current session is maintained.
  • the handover method when the user equipment switches from the WiMAX access network to the WiFi access network, the attachment point of the user equipment in the WiMAX access network, that is, the service site, is currently The serving base station switches to the WiMAX switching server, so that the user equipment is still in the network state in the WiMAX access network, that is, the context information of the user equipment is retained, and when the user equipment switches from the WiFi access network to the WiMAX access network, The process of switching from the WiMAX switching server to the target base station is performed, and the process of pre-authentication and key distribution of the WiMAX access network does not have to be re-scheduled, and the steps are less, saving time, so that the multi-mode user equipment in the single radio frequency switching mode is After the WiMAX access network switches to the WiFi access network, it can quickly switch back to the original WiMA access network.
  • the context of the user equipment in the WiMAX network is maintained during the WiMAX to WiFi handover process.
  • the above description can be used to obtain the context of the user equipment in the WiFi network during the WiMAX handover process.
  • the embodiment is not described here.
  • an embodiment of the present invention provides a handover apparatus, which includes:
  • the switching server obtaining unit 51 is configured to acquire an address of the first access network switching server when the user equipment switches from the first access network to the second access network;
  • An attachment point switching unit 52 configured to switch an attachment point of the user equipment from the first access network service station to the first access network switching server;
  • the switchback preparation unit 53 is configured to establish a tunnel with the first access network switching server after the second access point completes the network access, and interact with the first access network switching server by using the tunnel, Performing an attach to the first access network switching server, and entering an idle mode of the first access network;
  • the switchback unit 54 is configured to perform attaching on the target site of the first access network when the user equipment is switched back from the second access network to the first access network, to exit the idle mode and Re-accessing the first access network.
  • the attachment point switching unit 52 is specifically configured to: the user equipment sends a handover request message to the WiMAX monthly service base station, and the WiMAX monthly service base station and the WiMAX switching server And exchanging handover related information; receiving a handover response message returned by the WiMAX serving base station; and according to the handover response message, the user equipment sends a handover indication message to the WiMAX serving base station, where the WiMAX serving base station sends a handover confirmation message to the WiMAX handover server.
  • a message is periodically sent to the WiMAX switching server through the tunnel.
  • the switchback preparation unit 53 is further configured to periodically send a message to the first access network switching server to maintain an idle mode by using a tunnel established by the first access network switching server.
  • the switchback unit 54 is specifically configured to: the user equipment selects the first access network target station; removes the tunnel between the first access network switching server; turns off the second access network radio, and starts the first connection Incoming radio frequency; performing a network re-entry procedure on the first access network target site.
  • the above switching device may be set on the user equipment as part of the user equipment function.
  • the switching device acquires the address of the first access network switching server when the first access network switches to the second access network by the switching server acquiring unit 51; and switches the user equipment to the second access network when the first access network switches to the second access network.
  • the attachment point of the user equipment is removed from the first access network service station by the attachment point switching unit 52.
  • the switchback preparation unit 53 can directly establish a tunnel with the first access network switching server, and interact with the first access network switching server through the tunnel to perform the Attaching to the first access network switching server, and entering an idle mode of the first access network, and then attaching by the switchback unit 54 to the target site of the first access network to exit the idle mode And re-accessing the first access network, compared with the prior art, it is not necessary to re-pass the pre-authentication, key distribution, and the like of the first access network, and the steps are less, so that the multi-mode in the single radio frequency switching mode After the user equipment switches from the first access network to the second access network, the user equipment can quickly switch back to the original first access network.
  • an embodiment of the handover method according to FIG. 3 and FIG. 4 the embodiment of the present invention provides another handover apparatus, including:
  • the switching server IP address obtaining unit 61 is configured to obtain an address of the first access network switching server before or after the user equipment switches from the first access network to the second access network;
  • the re-entry switching unit 62 is configured to establish a tunnel with the first access network switching server after the user equipment is switched from the first access network to the second access network, and switch the server from the first access network through the tunnel. Entering the first access network and triggering the first access network to switch the attachment point of the user equipment from the first access network service station to the first access network switching server;
  • the idle mode control unit 63 is configured to: after the user equipment completes the handover from the first access network service station to the first access network switching server by using the tunnel, by using the tunnel and the first access network Switching server interaction, entering an idle mode of the first access network;
  • the switchback unit 64 is configured to perform attaching on the target site of the first access network when the user equipment is switched back from the second access network to the first access network, to exit the idle Mode and re-accessing the first access network.
  • the re-entry switching unit 62 performs a re-entry of the first access network from the first access network through the tunnel and triggers the first access network.
  • the process of switching the attachment point of the user equipment from the first access network service station to the first access network switching server includes:
  • a message is periodically sent to the first access network switching server through the tunnel.
  • the idle mode control unit 63 is further configured to periodically send a message to the first access network switching server through a tunnel established with the first access network switching server to maintain an idle mode.
  • the switchback unit 64 is specifically configured to: select a first access network target station; tear down a tunnel between the first access network switching server; turn off the second access network radio, and enable the first access Network radio; Performs a network re-entry procedure on the first access network target site.
  • the above switching device may be set on the user equipment as part of the user equipment function.
  • the switching device obtains the IP address of the first access network switching server before or after the first access network switches to the second access network by using the switching server acquiring unit 61; After the network access is switched, the tunnel between the first access network switching server and the first access network switching server is established, and the first access network is re-entered through the tunnel to switch the attachment point of the user equipment from the first access network service station. Go to the first access network switching server, and then interact with the first access network switching server through the idle mode control unit 63 to enter the idle mode of the first access network, and then be switched by the switchback unit 64.
  • the key distribution process has fewer steps, so that the multi-mode user equipment in the single radio switching mode can quickly switch back to the original first access network after switching from the first access network to the second access network.
  • the embodiment of the third switching device includes the following unit: a server switching unit 91, configured to be in a process of switching a user equipment from a first access network to a second access network, Switching the first access network service station of the user equipment from the current serving station to the first access network switching server.
  • the interaction unit 92 is configured to switch between the tunnel in the second access network and the first access network before the user equipment switches from the second access network to the first access network.
  • the server interacts to perform a handover in the first access network from the handover server to a target site of the user equipment.
  • the attaching unit 93 is configured to attach the user equipment to the target station of the first access network, and complete handover from the first access network switching server to the target station.
  • the switching device may further include:
  • the sending unit 94 is configured to periodically or irregularly send a message to the first access network switching server through the tunnel to keep the user equipment in an online state of the first access network.
  • the user equipment provided by the embodiment of the present invention switches the first network service station of the user equipment from the current serving station to the first access network during the handover process from the first access network to the second access network.
  • Switching the server before the user equipment switches back to the first access network from the second access network, interacting with the first access network switching server through the tunnel, performing the first access network And switching the handover of the server to the target site of the user equipment; the user equipment attaches on the target site of the first access network, and completes the handover from the first access network switching server to the target site.
  • the first access network still retains the context information of the user equipment, and when the user equipment needs to switch back from the second access network to the first access network,
  • the first connection The switching server that enters the network switches to the target site and completes the process of returning to the first access network. Compared with the prior art, it is not necessary to re-pass the pre-authentication, key distribution, and the like of the first access network, and the steps are less, so that the multi-mode user equipment in the single radio frequency switching mode is switched from the first access network to the second. After accessing the network, it can quickly switch back to the original first access network.
  • the method steps described in connection with the embodiments disclosed herein may be implemented in hardware, a software module executed by a processor, or a combination of both.
  • the software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of In the storage medium.

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Description

一种切换方法和切换设备 本申请要求 2009年 8月 28日递交的申请号为 200910171407.X、 发明名称 为 "一种切换方法和切换设备" 的中国专利申请, 2009年 11月 20递交的申请 号为 200910225384.6、 发明名称为 "一种切换方法和切换设备" 的中国专利申 请, 以及 2010年 2月 10 日递交的申请号为 201010116555.4、 发明名称为 "一 种切换方法和切换设备" 的中国专利申请的优先权, 其全部内容通过引用结合 在本申请中。 技术领域
本发明涉及通信技术领域, 具体而言是涉及一种单射频切换模式下多模用 户设备使用的切换方法和切换设备。 背景技术
单射频切换模式下的多模用户设备, 从一种接入网切换到另一种接入网, 通常需要寻找合适的切换服务器与之建立隧道, 然后通过隧道与目标接入网经 过认证、 密钥协商之后, 再进行射频切换, 在目标接入网络上完成入网过程。
以 WiFi与 WiMAX的切换作为示例 , WiMAX ( Worldwide Interoperability for
Microwave Access,微波存取全球互通)是一种无线城域网( WMAN )接入技术, 其信号传输半径可以达到 50公里,基本上能覆盖到城郊。 WiFi (Wireless Fidelity, 无线保真)是一种无线局域网( Wireless Local Area Network, WLAN )接入技术, 其信号传输半径只有几百米远。 二者都是重要的无线宽带接入技术, 但各有优 缺点 , 将 WiFi作为 WiMA 的补充 , 在 WiMAX信号弱的室内或人口稠密的地 点使用 WiFi, 是一种不错的选择, 但由于 WiFi的覆盖范围较小, 用户设备切换 到 WiFi接入网后, 可能很快又要从 WiFi接入网切换回 WiMAX接入网。
在实现本发明过程中, 发明人研究发现: 按照通常做法, 用户设备从第一 接入网 (例如 WiMAX )切换到第二接入网 (例如 WiFi ), 然后再切换回第一接 入网, 需要重新进行认证, 密钥协商过程, 这样做的效率无疑非常低下。 发明内容
本发明实施例提供一种切换方法和切换设备, 使得单射频切换模式下的多 模用户设备从第一接入网切换到第二接入网后, 能够迅速切换回原来的第一接 入网。
本发明实施例提供的一种切换方法, 包括:
用户设备从第一接入网向第二接入网切换时, 获取第一接入网切换服务器 的地址;
将用户设备的附着点从第一接入网服务站点切换到所述第一接入网切换服 务器;
用户设备在第二接入网完成入网后, 与所述第一接入网切换服务器建立隧 道, 并通过该隧道与所述第一接入网切换服务器进行交互, 进行对所述第一接 入网切换服务器的附着, 并进入所述第一接入网的空闲模式;
用户设备从所述第二接入网切换回所述第一接入网时, 在所述第一接入网 的目标站点上进行附着, 以退出所述空闲模式并重新接入所述第一接入。
本发明实施例还提供一种切换方法, 包括:
用户设备获取第一接入网切换服务器的 IP地址;
用户设备与所述第一接入网切换服务器建立 IP隧道, 通过所述隧道与所述 第一接入网切换服务器交互, 进行所述第一接入网中从所述用户设备的服务站 点到所述切换服务器的切换;
通过所述隧道从所述切换服务器进入所述第一接入网的空闲模式; 用户设备从所述第二接入网切换回所述第一接入网时, 在所述第一接入网 的目标站点上进行附着, 以退出所述空闲模式并重新接入所述第一接入。
本发明实施例提供的一种切换设备, 包括:
切换服务器获取单元, 用于在用户设备从第一接入网向第二接入网切换时, 获取第一接入网切换服务器的地址;
附着点切换单元 , 用于将用户设备的附着点从第一接入网服务站点切换到 所述第一接入网切换服务器;
切回准备单元, 用于用户设备在第二接入点完成入网后, 与所述第一接入 网切换服务器建立隧道, 并通过该隧道与所述第一接入网切换服务器进行交互 , 进行对所述第一接入网切换服务器的附着 , 并进入所述第一接入网的空闲模式; 切回单元, 用于用户设备从所述第二接入网切换回所述第一接入网时, 在 所述第一接入网的目标站点上进行附着, 以退出所述空闲模式并重新接入所述 第一接入网。
本发明实施例还提供一种切换设备, 包括:
切换服务器 IP地址获取单元 , 用于在用户设备从第一接入网向第二接入网 切换前或切换后, 获取第一接入网切换服务器的 IP地址;
重入切换单元, 用于在用户设备从第一接入网向第二接入网切换后, 与第 一接入网切换服务器建立 IP隧道, 通过该隧道从第一接入网切换服务器重入第 一接入网并触发第一接入网将用户设备的附着点从第一接入网服务站点切换到 所述第一接入网切换服务器;
空闲模式控制单元, 用于用户设备在通过所述隧道完成从第一接入网服务 站点向第一接入网切换服务器的切换后, 通过所述隧道与所述第一接入网切换 服务器交互, 进入所述第一接入网的空闲模式;
切回单元, 用于用户设备从所述第二接入网切换回所述第一接入网时, 在 所述第一接入网的目标站点上进行附着, 以退出所述空闲模式并重新进入所述 第一接入网。
由上述本发明实施例提供的技术方案可知, 通过在第一接入网向第二接入 网切换后, 将所述用户设备在所述第一接入网的状态置为空闲模式, 使得所述 第一接入网在所述用户设备切换到所述第二接入网之后仍保留所述用户设备的 上下文信息, 当所述用户设备从所述第二接入网切换回所述第一接入网时, 直 接在所述第一接入网的目标站点上进行附着, 以退出空闲模式的方式重新进入 所述第一接入网而完成从所述第二接入网向所述第一接入网的切换 , 与现有技 术相比, 不必重新经过第一接入网的预认证、 密钥分发等过程, 步驟较少, 使 得单射频切换模式下的多模用户设备从第一接入网切换到第二接入网后, 能够 迅速切换回原来的第一接入网。
附图说明
为了更清楚地说明本发明实施例的技术方案, 下面将对实施例中所需要使 用的附图作一简单地介绍。
图 1为本发明实施例提供的一种切换方法的流程图;
图 2为本发明实施例提供的一种切换方法的完整处理流程图;
图 3为本发明实施例提供的又一种切换方法的流程图;
图 4为本发明实施例提供的又一种切换方法的完整处理流程图;
图 5为本发明实施例提供的一种切换设备的功能单元图。
图 6是本发明另一个实施例提供的切换设备的功能单元图。
图 7为本发明实施例提供的第三种切换方法的流程图。
图 8为本发明实施例提供的第三种切换方法的完整处理流程图。
图 9为本发明实施例提供的第三种切换设备的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行清 楚、 完整地描述。
工作在单射频切换模式下的多模用户设备, 当前通过第一接入网接入到第 一接入网的核心网, 当满足一定的触发条件, 需要切换到第二接入网的接入方 式, 即切换到通过第二接入网接入到第一接入网的核心网。 所述的一定的触发 条件, 可以是用户设备发现第一接入网的信号较弱, 自动决定向第二接入网切 换, 或者用户主动操作用户设备切换到第二接入网, 也可能是网络要求用户设 备向第二接入网切换。
当用户设备从第一接入网切换到第二接入网时, 因为用户设备是工作在单 射频切换模式下 , 所以用户设备可以先关闭第一接入网射频再打开第二接入网 射频, 这种方式是严格的单收单发模式, 即任何时候只会有一个射频电路在工 作。 用户设备也可以先打开第二接入网射频再关闭第一接入网射频, 在关闭第 一接入网射频之前, 第二接入网射频仅作收听工作, 这就是双收单发模式, 也 属于单射频工作模式。 不管是单收单发还是双收单发, 用户设备一旦决定通过 第二接入网射频发送信息, 就必须关闭第一接入网射频, 至少是禁止第一接入 网射频的发送。 当终端从第二接入网切换到第一接入网时, 过程与上面的类似。
参见图 1 , 本发明实施例提供的切换方法, 包括:
S110, 用户设备从第一接入网向第二接入网切换时, 获取第一接入网切换 服务器的地址。
获取的方式包括但不限于如下方式: 用户设备通过动态主机配置协议 ( Dynamic Host Configuration Protocol, DHCP ), 或者通过 i或名系统 ( Domain Name System, DNS )解析, 或者通过在初始入网时请求 IP地址的过程中, 或 者通过查询专用的信息服务器, 获取第一接入网切换服务器的地址。
S120, 将用户设备的附着点从第一接入网服务站点切换到所述第一接入网 切换服务器。
所谓附着点是指与用户设备相关联并为其提供服务的站点, 比如当用户设 备工作在 WiMAX时, 附着点就是用户设备注册的基站。
所述服务站点是指通过无线射频与用户设备进行通信的基站或者接入点。 当第一接入网为 WiMAX接入网时, 所述用户设备的附着点从第一接入网 服务站点切换到所述第一接入网切换服务器 , 包括:
用户设备向 WiMAX月良务基站发送切换请求消息 , WiMAX月良务基站与所述 WiMAX切换服务器交换切换相关信息;用户设备通过所述第一接入网服务站点 接收 WiMAX服务基站返回的切换响应消息; 根据所述切换响应消息, 用户设 备向 WiMAX服务基站发送切换指示消息, 由所述 WiMAX服务基站向所述 WiMAX切换服务器发送切换确认消息。
因为这里以 WiMAX 为第一接入网为例, 描述了 WiMAX 服务基站向 WiMAX切换服务器的切换过程, WiMA 切换服务器在这里相当于虚拟基站。 如果是其它网络如 3GPP接入网 ,其从服务站点向切换服务器的切换过程与此类 似, 这里不——举例描述。
S130, 用户设备在第二接入网完成入网后, 与所述第一接入网切换服务器 建立隧道, 并通过该隧道与所述第一接入网切换服务器进行交互, 进行对所述 第一接入网切换服务器的附着, 并进入所述第一接入网的空闲模式。
由于用户设备在第二接入点完成入网之前 , 其附着点已经从第一接入网服 务站点切换到第一接入网切换服务器, 因此当用户设备从第一接入网切换到第 二接入网时, 第一接入网仍然保留着用户设备的上下文信息, 当用户设备从第 二接入网切换回第一接入网时, 就不必重新经过第一接入网切换服务器的发现、 认证、 密钥分发等过程。 因此, 用户设备在第二接入点完成入网后, 只需直接 与所述第一接入网切换服务器建立隧道, 并通过该隧道与所述第一接入网切换 服务器进行交互, 进行对所述第一接入网切换服务器的附着, 并进入所述第一 接入网的空闲模式。
以第一接入网为 WiMAX接入网为例, 当用户设备与 WiMA 切换服务器 建好隧道后, 该 WiMAX切换服务器就作为一个虚拟基站工作。 用户设备通过 该隧道首先与该虚拟基站进行测距过程, 测距过程是 WiMAX接入过程的第一 步, 当测距完成后, 不必再经过认证、 密钥分发等过程用户设备就附着在这个 虚拟基站上。 这时, 用户设备可以通过该隧道向所述虚拟基站发送去注册请求, 当收到所述虚拟基站返回的去注册响应后, 就进入了空闲模式, 空闲模式的进 入是为用户设备快速切换回 WiMAX射频作准备。
当用户设备工作在第二接入网时, 为了保持在第一接入网的空闲模式, 要 定期的通过隧道向第一接入网切换服务器发送消息以保持用户设备在第一接入 网中的空闲模式。
这里以 WiMAX网络为例 , 在 WiMAX网络中, 用户终端是通过向网络发 送位置更新消息( Location Update )来达到保持用户设备空闲模式的目的, 对于 其它类型的网络, 可能发送其它的消息来达到保持空闲模式的目的。 在其它网 络中, 对应与 WiMA 网络中所说的空闲模式, 也可能称为休眠状态、 省电模 式等等。
S 140 , 用户设备从所述第二接入网切换回所述第一接入网时 , 在所述第一 接入网的目标站点上进行附着, 以退出所述空闲模式并重新接入所述第一接入 网。 此步驟具体包括: 用户设备通过侦听或查询选定第一接入网目标站点; 拆 除和所述第一接入网切换服务器之间的隧道; 关闭第二接入网射频, 开启第一 接入网射频; 在第一接入网目标站点上执行退出空闲模式的测距过程。
例如以第一接入网为 WiMAX接入网为例, 在 WiMAX射频下, 用户设备 向选定的目标基站发送测距请求消息, 在该请求消息中使用参数指定退出空闲 模式, 以此完成通过目标基站的重新入网。 对于其它的网络类型, 具体的退出 空闲模式方法与之类似, 这里不——列举描述。
本发明实施例提供的切换方法, 在用户设备从第一接入网向第二接入网切 换时, 获取第一接入网的切换服务器的地址; 在用户设备向第二接入网切换之 前, 用户设备在第一网络中的附着点从服务站点切换到所述第一接入网的切换 服务器; 当用户设备切换到第二接入网并完成在第二接入网的入网过程后, 用 户设备与所说第一接入网的切换服务器建立隧道, 并通过隧道与所述第一接入 网切换服务器进行交互, 进行对所述第一接入网切换服务器的附着, 并进入所 述第一接入网的空闲模式, 然后在所述第一接入网的目标站点上进行附着, 以 退出空闲模式并重新接入所述第一接入网。 因此当用户设备切换到第二接入网 时, 第一接入网仍然保留着用户设备的上下文信息, 当用户设备需要从第二接 入网切换回第一接入网时, 可以直接切换射频, 从选定的第一接入网目标站点 上退出空闲模式即完成了第一接入网的重新入网过程。 与现有技术相比, 不必 重新经过第一接入网的预认证、 密钥分发等过程, 步驟较少, 使得单射频切换 模式下的多模用户设备从第一接入网切换到第二接入网后 , 能够迅速切换回原 来的第一接入网。
下面通过用户设备从 WiMAX接入网切换到 WiFi接入网, 然后再切换回 WiMAX接入网的完整流程, 说明上述本发明提供的切换方法实施例。 首先需要说明的是, 这里仅以 WiMAX与 WiFi的切换作为示例, 本发明提 供的方法并不限定于 WiMAX与 WiFi之间的切换, 也适用于其它类型的第一接 入网与第二接入网之间的切换。
参见图 2, 本发明实施例提供的切换方法的完整处理流程, 包括:
步驟 1、 用户设备寻找可用的 WiFi切换服务器以及本 WiMAX接入服务网 络( Access Service Network, ASN )可用的 WiMAX切换服务器, 如果这个过程 在用户设备初始入网时已经完成, 则此步骤不需要。
这里假设 WiFi网络也使用了切换服务器 , 因此用户设备一同获取 WiMAX 和 WiFi的切换服务器信息, 实际上 WiFi网络是否使用切换服务器与本发明提 供的切换方法无关。
步骤 2、 用户设备和 WiFi切换服务器之间建立隧道。
隧道建立之后, WiFi切换服务器作为一个虚拟 AP, 它与用户设备之间的报 文采用隧道传递, 隧道内传递的数据格式可以为: IP地址头 (IP header )、 隧道 头 ( Tunnel header )和 802.11MAC (媒体访问控制)帧 ( 802.11 MAC Frame ), 其中的 IP地址是可在公网寻址的所述 WiFi切换服务器的 IP地址, 及用户设备 的 IP地址; Tunnel header取决于采用的隧道协议, 如果使用通用路由封装协议 ( Generic Routing Encapsulation, GRE ), 贝1 J为 GRE header; 802.11 MAC Frame 为用户设备的 WiFi射频模块以及 WiFi切换服务器产生的 802.11格式的 MAC 帧。
步骤 3、 用户设备在 WiFi切换服务器(虚拟 AP )上完成 WiFi接入网的初 始入网过程。
首先用户设备和虚拟 AP之间进行开放系统认证。开放系统认证由两个消息 组成: 用户设备向虚拟 AP发送一个包含自身 ID的请求消息, 虚拟 AP直接回 送一个成功的响应消息。 然后用户设备与虚拟 AP 建立关联。 接着用户设备和 WiFi接入网的认证器之间进行 802.1x可扩展认证协议( Extensible Authentication Protocol, EAP )认证。 用户设备将认证 ^艮文通过隧道传递给虚拟 AP的认证器, 用户设备和认证服务器之间建立了主会话密钥 ( Master Session Key, MSK )。 认 证服务器将 MSK传递给虚拟 AP的认证器。 用户设备和虚拟 AP的认证器之间 进行 4次握手, 建立 PTK (成对临时密钥)。
步骤 4、 用户设备与 WiFi接入点进行预认证过程。
用户设备在虚拟 AP上完成初始入网过程后 , 根据 802.11-2007规范中的预 认证过程开始与 WiFi接入点 (目标 AP )进行预认证过程。 首先用户设备利用 与虚拟 AP的认证器建立的 PTK向虚拟 AP发送 802.1X基于局域网的可扩展认 证十办议 ( Extensible Authentication Protocol over LAN, EAPOL )启动(Start )消 息 , MAC帧中的 DA (目标地址)填目标 AP的基本月良务集标识( Basic Service Set Identifier, BSSID ), RA (接收器地址)填写虚拟 AP的 MAC地址。 该虚 拟 AP根据 DA的 BSSID, 查询到它对应的认证器的 IP地址。 然后与这个 IP地 址的认证器建立隧道, 进行认证数据的交互。 预认证完成后的结果就是用户设 备和目标 AP 之间建立了成对主密钥安全联盟 (Pairwise mater key security alliance, PMK SA
本处理流程是假设 WiMAX向 WiFi切换时, 首先通过 WiFi切换良务器完 成预认证, 然后再切换射频, 实际上向 WiFi切换时是否进行 WiFi网络的预认 证过程与本发明提供的切换方法无关。
步驟 5、 用户设备拆除和所述 WiFi切换服务器之间的隧道。
步驟 6、 用户设备向 WiMAX服务基站发送切换请求消息, 切换到 WiMAX 切换服务器这个虚拟基站上。 该步驟具体为: 用户设备向 WiMAX服务基站发送切换请求消息, WiMAX 服务基站与所述 WiMAX切换服务器交换切换相关信息; 通过所述第一接入网 服务站点接收 WiMAX服务基站返回的切换响应消息; 根据所述切换响应消息 , 用户设备向 WiMAX月良务基站发送切换指示消息, 由所述 WiMAX月良务基站向 所述 WiMAX切换服务器发送切换确认消息。
该步驟可以和步驟 2到步驟 5的过程同步进行, 但用户设备向服务基站发 送切换指示消息需在步骤 5之后进行。
步驟 7、 用户设备关闭 WiMAX射频, 开启 WiFi射频。
步驟 8、 用户设备与目标 AP完成重关联过程。
用户设备的重关联请求 ( Reassociation Request ) 中的强安全网络信息元素 ( Robust security network information element, RSNIE ) 中包含步骤 4中建立的
PMK的标识( PMKID ), 目标 AP根据 PMKID在自身緩存中搜索到与之相应的
PMK之后, 双方进行 4次握手, 获取到成对临时密钥 PTK, 从而完成在目标
AP的入网过程, 即完成在 WiFi接入网的入网过程。
步骤 9、 用户设备进行移动互联网协议 MIP注册过程。
步驟 10、 用户设备在 WiFi数据路径上与 WiMAX切换服务器建立隧道。 该隧道为在 WiFi数据路径上与 WiMAX切换服务器建立的三层隧道, 也即 是说, 用户设备是在 IP层即三层上(链路层为二层)与 WiMAX切换服务器进 行消息交互, 用户设备发送给 WiMAX切换服务器的二层报文作为 WiFi接入网 中的 IP报文的数据来传输。
步驟 11、 用户设备在隧道内与 WiMAX切换服务器完成测距过程。 该步驟 是步驟 6的后续步驟, 测距完成后, 用户设备就附着在了这个虚拟基站上。
步驟 12、 用户在隧道内向 WiMAX切换服务器发送去注册请求, 进入空闲 工作模式。
通过以上步骤 , 完成了从 WiMAX接入网向 WiFi接入网的切换 , 并且用户 设备在 WiMAX接入网中上下文信息得到保留。
步驟 13、用户设备工作在 WiFi接入网时, 为了保持 WiMAX接入网的空闲 模式, 要定期的通过隧道向 WiMAX切换服务器发送位置更新消息 (Location Update )。
当用户设备决定切换回 WiMAX 网络时, 在确定切换目标基站后, 执行以 下步驟:
步驟 14, 用户设备拆除和所述 WiMAX切换服务器之间的隧道。
步驟 15、 用户设备关闭 WiFi射频, 开启 WiMAX射频。
步骤 16、 用户设备在 WiMA 目标基站上执行测距及重新入网的过程。 这 是一个退出空闲模式的过程。
步驟 17、 用户设备进行移动互联网协议 MIP注册过程。
这样, 用户设备就完成了快速地切回到 WiMAX接入网, 使得用户的当前 会话得到保持。
由上述完整的切换处理流程可知, 本实施例提供的切换方法, 当用户设备 从 WiMAX接入网切换到 WiFi接入网时, 通过切换前用户设备的附着点从 WiMAX服务基站切换到所述 WiMAX切换服务器 ,在从 WiMAX接入网到 WiFi 接入网的切换完成后, 通过 WiFi隧道附着在 WiMAX切换服务器上, 并进入空 闲模式, 使得 WiMAX接入网仍然保留着用户设备的上下文信息, 当用户设备 从 WiFi接入网切换回 WiMAX接入网时 , 就不必重新经过 WiMAX接入网的预 认证、 密钥分发等过程, 步驟较少, 使得单射频切换模式下的多模用户设备从 WiMAX接入网切换到 WiFi接入网后,能够迅速切换回原来的 WiMAX接入网。 图 3是本发明又一实施例提供的切换方法, 包括:
S310, 用户设备获取第一接入网切换服务器的 IP地址。
用户设备为了在所述第二接入网中与所述第一接入网的切换服务器建立 IP 隧道, 需要获得所述第一接入网的切换服务器的 IP地址, 这可以在所述用户设 备在切换接入网之前获得, 也可以在切换到第二接入网之后获得, 具体获得方 式可以使用 DNS协议、 DHCP协议、 或查询专门的信息服务器等方式, 这里不 详细描述。
S320, 用户设备切换到第二接入网后, 与所述第一接入网切换服务器建立 IP 隧道, 通过所述隧道与所述第一接入网切换服务器交互, 进行所述第一接入 网中从所述用户设备的服务站点到所述切换服务器的切换。
所谓服务站点是指用户设备在切换到第二接入网之前为所述用户设备服务 的第一接入网接入点, 比如当所述第一接入网是 WiMAX 时, 服务站点就是原 来为用户设备服务的基站。
由于所述用户设备从所述第一接入网切换到所述第二接入网时, 并没有在 第一接入网发送任何有关向第二接入网切换或请求第一接入网退网的消息, 所 以所述第一接入网暂时还保留着所述用户设备的上下文信息, 所述用户设备可 以直接向目标站点例如切换服务器发送切换请求将附着点从服务站点切换到目 标站点。
以所述第一接入网为 WiMA 网络为例, 所述用户设备从第一接入网服务 站点向第一接入网切换服务器的切换过程为: 所述用户设备通过在第二接入网 中建立的隧道向所述第一接入网切换服务器发送测距请求消息, 在所述测距请 求消息中包含所述用户设备的服务站点的标识信息, 用户设备在这种情况下发 送的测距请求将起到切换请求的效果, 当然, 用户设备也可以在此时专门发送 切换请求消息, 在不同的网络中有不同的具体实现方法; 所述第一接入网切换 服务器收到所述测距请求后, 从接入网关以及所述用户设备的服务站点处获得 所述用户设备的上下文信息等(图 4 中没有画出)并建立数据路径等, 完成切 换准备过程; 所述第一接入网切换服务器向所述用户设备发送测距响应消息, 并指示完成切换; 所述第一接入网切换服务器与所述用户设备的服务站点交互 , 确认完成切换。
因为这里以 WiMAX 为第一接入网为例, 描述了 WiMAX 服务基站向 WiMAX切换服务器的切换过程, WiMAX切换服务器在这里相当于虚拟基站, 是切换目标基站。如果是其它网络如 3GPP接入网,其从服务站点向切换服务器 的切换过程与此类似, 这里不——举例描述。
本发明不关注所述用户设备与所述第一接入网切换服务器之间的隧道具体 采用何种方式建立。
S330, 通过所述隧道从所述切换服务器进入所述第一接入网的空闲模式。 所述用户设备通过步驟 S320完成所述第一接入网的基站切换过程后, 其在 所述第一接入网的附着点从第一接入网原服务站点切换到第一接入网切换服务 器, 因此可以通过隧道从所述第一接入网切换服务器进入所述第一接入网的空 闲模式。
以第一接入网为 WiMAX接入网为例 , 所述用户设备通过与所述第一接入 网切换服务器之间的隧道向该虚拟基站发送去注册请求, 在所述去注册请求消 息中指示进入空闲模式; 当收到所述虚拟基站返回的去注册响应后, 所述用户 设备就进入了所述第一接入网的空闲模式。
当用户设备工作在第二接入网时, 如果要保持在第一接入网的空闲模式, 则要定期的通过隧道向第一接入网切换服务器发送消息以保持用户设备在第一 接入网中的空闲模式。
这里以 WiMA 网络为例 , 在 WiMAX网络中, 用户设备是通过向网络发 送位置更新消息(Location Update )来达到保持用户设备空闲模式的目的, 对于 其它类型的网络, 可能发送其它的消息来达到保持空闲模式的目的。 在其它网 络中, 对应与 WiMAX 网络中所说的空闲模式, 也可能称为休眠状态、 省电模 式等等。
S340, 用户设备从所述第二接入网切换回所述第一接入网时, 在所述第一 接入网的目标站点上进行附着, 以退出所述空闲模式并重新接入所述第一接入。
在一个实施例中, 此步驟具体包括: 用户设备通过侦听或查询选定第一接 入网目标站点; 拆除和所述第一接入网切换服务器之间的隧道; 关闭第二接入 网射频, 开启第一接入网射频; 在第一接入网目标站点上执行退出空闲模式的 测距过程。
例如以第一接入网为 WiMAX接入网为例 , 在 WiMAX射频下, 用户设备 向选定的目标基站发送测距请求消息, 在该请求消息中使用参数指定退出空闲 模式, 以此完成通过目标基站的重新入网。 对于其它的网络类型, 具体的退出 空闲模式方法与之类似, 这里不——列举描述。
本发明实施例提供的切换方法, 用户设备从第一接入网切换到第二接入网 后, 与所述第一接入网切换服务器建立隧道; 通过所述隧道与所述第一接入网 切换服务器进行交互, 进行所述第一接入网中从所述用户设备的服务站点到所 述切换服务器的切换; 通过所述隧道从所述切换服务器进入所述第一接入网的 空闲模式; 用户设备从所述第二接入网切换回所述第一接入网时, 在所述第一 接入网的目标站点上进行附着, 以退出所述空闲模式并重新接入所述第一接入。 因此当用户设备切换到第二接入网时, 第一接入网仍然保留着用户设备的上下 文信息, 当用户设备需要从第二接入网切换回第一接入网时, 可以直接切换射 频, 从选定的第一接入网目标站点上退出空闲模式即完成了第一接入网的重新 入网过程。 与现有技术相比, 不必重新经过第一接入网的预认证、 密钥分发等 过程, 步驟较少, 使得单射频切换模式下的多模用户设备从第一接入网切换到 第二接入网后, 能够迅速切换回原来的第一接入网。
下面通过用户设备从 WiMAX接入网切换到 WiFi接入网, 然后再切换回 WiMAX接入网的完整流程, 说明上述本发明提供的又一切换方法实施例。
首先需要说明的是, 这里仅以 WiMAX与 WiFi的切换作为示例, 本发明提 供的方法并不限定于 WiMAX与 WiFi之间的切换, 也适用于其它类型的第一接 入网与第二接入网之间的切换。
参见图 4, 本发明的一个实施例提供的切换方法的完整处理流程, 包括: 步驟 401、 用户设备寻找可用的 WiFi切换服务器。
这里假设 WiFi网络也使用了切换服务器。
步驟 402、 用户设备和 WiFi切换服务器之间建立隧道。
隧道建立之后, WiFi切换服务器作为一个虚拟 AP, 它与用户设备之间的才艮 文采用隧道传递。
步驟 403、 用户设备通过隧道向 WiFi切换服务器(虚拟 AP )上完成 WiFi 接入网的预入网过程, 并包括从虚拟 AP向真实的目标 AP的切换过程。
在本发明中, 从所述第一接入网向所述第二接入网的单射频切换过程与本 发明无关, 因此这里不详细描述从 WiMAX接入网向 WiFi接入网切换的过程。
步驟 404、 用户设备拆除和所述 WiFi切换服务器之间的隧道。
步驟 405、 用户设备关闭 WiMAX射频 , 开启 WiFi射频。
步驟 406、 用户设备与目标 AP完成重关联过程, 完成从空口上重入 WiFi 网络。
步骤 407、 用户设备进行移动互联网协议 MIP注册过程。 在这步完成之后, 用户设备正在进行的应用连接就切换到 WiFi网络了。
步驟 408、用户设备通过 DNS、 DHCP,查询信息服务器等方式获得 WiMAX 切换服务器的 IP地址。这一步也可以发生在用户设备向 WiFi网络切换之前,例 如在步驟 401与 WiFi SFF的信息一起获得。
步骤 409、 用户设备与 WiMAX切换服务器建立 IP隧道。 因为用户设备目 前工作在 WiFi网络中, 因此这个隧道经过 WiFi网络。
该隧道是 IP隧道, 也即是说, 用户设备是在 IP层与 WiMAX切换服务器进 行消息交互, 用户设备与 WiMAX切换服务器之间的 WiMAX空口报文作为 IP 报文中的数据来传输。
步驟 410、 用户设备在隧道内与 WiMAX切换服务器完成测距过程, 进行 网络重入。 在用户设备发给 WiMAX切换服务器的测距请求消息中包含用户设 备的服务基站的标识。 WiMAX切换服务器收到测距请求消息后, 发现并没有该 设备的信息, 便从该设备的服务基站获得其上下文信息, 同时也从接入网关处 获得新的授权密钥等其它信息, 并且完成路径建立等切换准备工作。 WiMAX切 换服务器完成切换准备工作后, 就向用户设备回测距响应消息, 表明网络重入 成功。 WiMAX切换服务器还向用户设备的原服务基站发送切换完成消息, 原服 务基站可释放用户设备的上下文信息。
步骤 411、 用户在隧道内向 WiMAX切换服务器发送去注册请求, 进入空 闲工作模式。
通过以上步驟 , 完成了从 WiMAX接入网向 WiFi接入网的切换 , 并且用户 设备在 WiMAX接入网中上下文信息得到保留。 步驟 412、 用户设备工作在 WiFi接入网时, 为了保持 WiMAX接入网的空 闲模式,要定期的通过隧道向 WiMA 切换服务器发送位置更新消息(Location Update )。
当用户设备决定切换回 WiMAX 网络时, 在确定切换目标基站后, 执行以 下步驟:
步驟 413, 用户设备拆除和所述 WiMA 切换服务器之间的隧道。
步骤 414、 用户设备关闭 WiFi射频, 开启 WiMAX射频。
步驟 415、用户设备在 WiMAX目标基站上执行测距及重新入网的过程。这 是一个退出空闲模式的过程。由于用户设备在从目标基站重入网络时在 WiMAX 网络中处于空闲模式, 因此目标基站不会执行如步驟 409所说的过程, 所需做 的事情主要是建立数据路径, 过程较为筒单。
步驟 416、 用户设备进行移动互联网协议 MIP注册过程。
这样, 用户设备就完成了快速地切回到 WiMAX接入网, 使得用户的当前 会话得到保持。
由上述完整的切换处理流程可知, 本实施例提供的切换方法, 当用户设备 从 WiMAX接入网切换到 WiFi接入网后 , 通过隧道将用户设备在 WiMAX接入 网中的附着点从服务基站切换到所述 WiMAX切换服务器, 再从 WiMAX切换 服务器进入空闲模式, 使得 WiMAX接入网仍然保留着用户设备的上下文信息 , 当用户设备从 WiFi接入网切换回 WiMA 接入网时, 直接从目标基站退出空闲 模式即可, 就不必重新经过 WiMAX接入网的预认证、 密钥分发等过程, 步骤 较少, 使得单射频切换模式下的多模用户设备从 WiMAX接入网切换到 WiFi接 入网后, 能够迅速切换回原来的 WiMAX接入网。
图 7是本发明又一实施例提供的切换方法, 包括: S710, 用户设备在从第一接入网向第二接入网的切换过程中, 将所述用户 设备的第一接入网服务站点从当前服务站点切换到所述第一接入网切换服务 哭
所述用户设备既可以使用图 1 所示实施例在从所述第一接入网向所述第二 接入网之前进行从所述当前服务站点向所述第一接入网切换服务器的切换过 程, 也可以使用图 3 所示实施例在所述用户设备切换到所述第二接入网之后通 过所述第二接入网中的隧道进行从所述当前服务站点向所述第一接入网切换服 务器的切换过程。
与图 1和图 3所示实施例不同的是, 所述用户设备在从所述第一接入网切 换到所述第二接入网之后, 不进入所述第一接入网的空闲模式。
S720, 用户设备从所述第二接入网切换回所述第一接入网前, 通过所述隧 道与所述第一接入网切换服务器交互, 进行所述第一接入网中从所述切换服务 器到用户设备的目标站点的切换。
在这一步, 所述用户设备通过经过所述第二接入网的所述隧道向所述第一 接入服务器请求向目标站点的切换, 目标站点完成切换准备工作。
S730, 用户设备在所述第一接入网的目标站点上进行附着, 完成从所述第 一接入网切换服务器到目标站点的切换。 在这一步, 所述用户设备在空口上切 换到所述第一接入网络, 从之前做了切换准备的目标站点上附着, 目标站点完 成从所述第一接入网切换服务器向该目标站点切换的后续步驟。 在这个步驟完 成后, 也就完成了从所述第二接入网向所述第一接入网的全部切换过程。
本发明实施例提供的切换方法, 用户设备在从第一接入网向第二接入网的 切换过程中 , 将所述用户设备的第一网络服务站点从当前服务站点切换到所述 第一接入网切换服务器; 用户设备从所述第二接入网切换回所述第一接入网前, 通过所述隧道与所述第一接入网切换服务器交互, 进行所述第一接入网中从所 述切换服务器到用户设备的目标站点的切换; 用户设备在所述第一接入网的目 标站点上进行附着, 完成从所述第一接入网切换服务器到目标站点的切换。 因 此当用户设备切换到第二接入网时, 第一接入网仍然保留着用户设备的上下文 信息, 当用户设备需要从第二接入网切换回第一接入网时, 再通过隧道从所述 第一接入网的切换服务器切换到目标站点, 完成回到第一接入网的过程。 与现 有技术相比, 不必重新经过第一接入网的预认证、 密钥分发等过程, 步骤较少, 使得单射频切换模式下的多模用户设备从第一接入网切换到第二接入网后, 能 够迅速切换回原来的第一接入网。
下面通过用户设备从 WiMAX接入网切换到 WiFi接入网, 然后再切换回 WiMAX接入网的完整流程, 说明上述本发明提供的又一切换方法实施例。
首先需要说明的是, 这里仅以 WiMAX与 WiFi的切换作为示例, 本发明提 供的方法并不限定于 WiMAX与 WiFi之间的切换, 也适用于其它类型的第一接 入网与第二接入网之间的切换。
参见图 8, 本发明的一个实施例提供的切换方法的完整处理流程, 包括: 步驟 801、 用户设备从 WiMAX接入网切换到 WiFi接入网。 这个过程在图 2和图 4所示实施例中已经详细描述, 这里不再赘述。
步驟 802、 用户设备在从 WiMAX接入网向 WiFi接入网切换的过程中, 完 成 WiMAX中的服务基站向 WiMAX切换服务器的切换。这个过程可以使用图 2 所示实施例中的步骤 6和 11所示的方法,也可以使用图 4所示实施例中步骤 410 所示的方法。 图 2中步驟 6和 11的方法是在用户设备切换到 WiFi接入网之前, 向 WiMAX服务基站请求向 WiMAX切换服务器的切换, WiMAX服务基站和 WiMAX切换服务器完成切换准备工作,然后用户设备向 WiMAX服务基站确认 进行这个切换。 当用户设备切换到 WiFi接入网之后, 通过隧道附着到 WiMAX 切换服务器, 完成从服务基站向切换服务器的切换过程。 而图 4 中的步骤 410 所示的方法, 是在用户设备切换到 WiFi接入网之后, 通过隧道附着到 WiMAX 切换服务器时,触发 WiMAX切换服务器进行从用户设备的服务基站向 WiMAX 切换服务器的切换过程。
无论使用哪种从 WiMAX服务基站到 WiMA 切换服务器的切换方法, 本 实施例在这个步骤之后所述用户设备不进入 WiMAX网络的空闲模式。
用户设备可以周期性地或者不定期地通过所述隧道向 WiMAX切换服务器 发送某个消息例如测距消息, 以便 WiMAX接入网知道该用户设备在网, 而不 会在一段时间后因找不到该用户设备而将其作退网处理, 即删除该用户设备相 关的所有信息, 回收其所占用资源。
WiMAX切换服务器也可以启动一个定时器, 在这个定时器超时之前, 即使 没有收到任何来自该用户设备的消息 , 也不会将该用户设备作退网处理。
步驟 803、当用户设备决定切换回 WiMAX网络时,在确定切换目标基站后, 进行从 WiMAX切换服务器向选定的目标基站的切换过程。 这个过程和图 2中 的步驟 6—样 , 只不过用户设备和切换服务器之间的消息都是通过 WiFi网络中 的隧道发送的。
步驟 804, 用户设备拆除和所述 WiMAX切换服务器之间的隧道。
步驟 805、 用户设备关闭 WiFi射频, 开启 WiMAX射频。
步骤 806、用户设备在 WiMAX目标基站上执行测距及重新入网的过程, 即 附着到目标基站。 用户设备一旦附着到目标基站后, 目标基站完成从切换服务 器向该目标基站的切换过程的后续步驟, 这包括通知切换服务器该终端已附着 到该目标基站。 步驟 807、 用户设备进行移动互联网协议 MIP注册过程。
这样 , 用户设备就完成了快速地切回到 WiMA 接入网, 使得用户的当前 会话得到保持。
由上述完整的切换处理流程可知, 本实施例提供的切换方法, 当用户设备 从 WiMAX接入网切换到 WiFi接入网时 , 将用户设备在 WiMAX接入网中的附 着点即服务站点从当前服务基站切换到所述 WiMAX切换服务器, 使得用户设 备在 WiMAX接入网中仍然处于在网状态, 即保留着用户设备的上下文信息, 当用户设备从 WiFi接入网切换回 WiMAX接入网时 , 再执行从 WiMAX切换服 务器向目标基站的切换过程, 就不必重新经过 WiMAX接入网的预认证、 密钥 分发等过程, 步驟较少, 节省时间, 使得单射频切换模式下的多模用户设备从 WiMAX接入网切换到 WiFi接入网后,能够迅速切换回原来的 WiMA 接入网。 这里仅以 WiMAX向 WiFi切换的过程中保持用户设备在 WiMAX网络中的上下 文为例进行说明 , 本领域的技术人员可通过以上说明得到 WiFi向 WiMAX切换 过程中保持用户设备在 WiFi网络中的上下文的实施方式, 在此不再赘述。
本领域的技术人员还可通过以上实施例得到其他不同于 WiMA 网络和 WiFi 网络的网络间切换, 在用户设备切换到一个网络的过程中, 保持用户设备 在另一个网络中的上下文的技术方案, 在此不再赘述。
参见图 5, 基于图 1和图 2所述的切换方法实施例, 本发明实施例提供了一 种切换设备, 包括:
切换服务器获取单元 51 , 用于在用户设备从第一接入网向第二接入网切换 时, 获取第一接入网切换服务器的地址;
附着点切换单元 52, 用于将用户设备的附着点从第一接入网服务站点切换 到所述第一接入网切换服务器; 切回准备单元 53, 用于用户设备在第二接入点完成入网后, 与所述第一接 入网切换服务器建立隧道, 并通过该隧道与所述第一接入网切换服务器进行交 互, 进行对所述第一接入网切换服务器的附着, 并进入所述第一接入网的空闲 模式;
切回单元 54, 用于用户设备从所述第二接入网切换回所述第一接入网时 , 在所述第一接入网的目标站点上进行附着, 以退出所述空闲模式并重新接入所 述第一接入网。
其中, 当第一接入网为 WiMAX接入网时 , 所述附着点切换单元 52具体用 于, 用户设备向 WiMAX月良务基站发送切换请求消息 , WiMAX月良务基站与所述 WiMAX切换服务器交换切换相关信息;接收 WiMAX服务基站返回的切换响应 消息; 根据所述切换响应消息, 用户设备向 WiMAX服务基站发送切换指示消 息, 所述 WiMAX服务基站向所述 WiMAX切换服务器发送切换确认消息。
用户设备工作在第二接入网时, 为了保持第一接入网的空闲模式, 要定期 的通过隧道向 WiMAX切换服务器发送消息, 为此,
所述切回准备单元 53, 还用于用户设备定期通过与所述第一接入网切换服 务器建立的隧道向所述第一接入网切换服务器发送消息以保持空闲模式。
所述切回单元 54具体用于, 用户设备选定第一接入网目标站点; 拆除和所 述第一接入网切换服务器之间的隧道; 关闭第二接入网射频, 开启第一接入网 射频; 在第一接入网目标站点上执行网络重进入过程。
上述切换设备可以为用户设备功能的一部分, 设置在用户设备上。
本发明实施例提供的切换设备, 通过切换服务器获取单元 51在第一接入网 向第二接入网切换时获取第一接入网切换服务器的地址; 在用户设备向第二接 入网切换之前, 由附着点切换单元 52将用户设备的附着点从第一接入网服务站 点切换到所述第一接入网切换服务器, 因此当用户设备切换到第二接入网时, 第一接入网仍然保留着用户设备的上下文信息, 当用户设备需要从第二接入网 切换回第一接入网时, 切回准备单元 53可以直接与所述第一接入网切换服务器 建立隧道, 并通过该隧道与所述第一接入网切换服务器进行交互, 进行对所述 第一接入网切换服务器的附着, 并进入所述第一接入网的空闲模式, 然后由切 回单元 54在所述第一接入网的目标站点上进行附着, 以退出所述空闲模式并重 新接入所述第一接入网, 与现有技术相比, 不必重新经过第一接入网的预认证、 密钥分发等过程, 步驟较少, 使得单射频切换模式下的多模用户设备从第一接 入网切换到第二接入网后, 能够迅速切换回原来的第一接入网。
参见图 6, 基于图 3和图 4所述的切换方法实施例, 本发明实施例提供了又 一种切换设备, 包括:
切换服务器 IP地址获取单元 61 ,用于在用户设备从第一接入网向第二接入 网切换前或切换后, 获取第一接入网切换服务器的地址;
重入切换单元 62,用于在所述用户设备从第一接入网向第二接入网切换后, 与第一接入网切换服务器建立隧道, 通过隧道从第一接入网切换服务器重入第 一接入网并触发第一接入网将所述用户设备的附着点从第一接入网服务站点切 换到所述第一接入网切换服务器;
空闲模式控制单元 63, 用于所述用户设备在通过所述隧道完成从第一接入 网服务站点向第一接入网切换服务器的切换后, 通过所述隧道与所述第一接入 网切换服务器交互, 进入所述第一接入网的空闲模式;
切回单元 64 , 用于所述用户设备从所述第二接入网切换回所述第一接入网 时, 在所述第一接入网的目标站点上进行附着, 以退出所述空闲模式并重新接 入所述第一接入网。 当所述第一接入网为 WiMAX接入网时 , 所述重入切换单元 62执行的通过 所述隧道从第一接入网切换服务器重入第一接入网并触发第一接入网将用户设 备的附着点从第一接入网服务站点切换到所述第一接入网切换服务器的过程具 体包括:
向所述第一接入网切换服务器发送测距请求消息, 在测距请求消息中包含 所述设备的服务站点的标识信息;
接收所述第一接入网切换服务器发送的测距响应消息。
用户设备工作在第二接入网时, 为了保持第一接入网的空闲模式, 要定期 的通过隧道向第一接入网切换服务器发送消息 , 为此,
所述空闲模式控制单元 63, 还用于定期通过与所述第一接入网切换服务器 建立的隧道向所述第一接入网切换服务器发送消息以保持空闲模式。
所述切回单元 64可具体用于, 选定第一接入网目标站点; 拆除和所述第一 接入网切换服务器之间的隧道; 关闭第二接入网射频, 开启第一接入网射频; 在第一接入网目标站点上执行网络重进入过程。
上述切换设备可以为用户设备功能的一部分, 设置在用户设备上。
本发明实施例提供的切换设备, 通过切换服务器获取单元 61在第一接入网 向第二接入网切换之前或之后获取第一接入网切换服务器的 IP地址; 在用户设 备向第二接入网切换之后 , 通过重入切换单元 62建立与第一接入网切换服务器 之间的隧道, 通过隧道重入第一接入网, 将用户设备的附着点从第一接入网服 务站点切换到所述第一接入网切换服务器, 之后通过空闲模式控制单元 63与所 述第一接入网切换服务器交互, 进入所述第一接入网的空闲模式, 然后由切回 单元 64在所述第一接入网的目标站点上进行附着, 以退出所述空闲模式并重新 接入所述第一接入网, 与现有技术相比, 不必重新经过第一接入网的预认证、 密钥分发等过程, 步驟较少, 使得单射频切换模式下的多模用户设备从第一接 入网切换到第二接入网后, 能够迅速切换回原来的第一接入网。
如图 9所示, 本发明提供的第三种切换设备的实施例, 包括如下单元: 服务器切换单元 91 , 用于在用户设备从第一接入网向第二接入网的切换过 程中, 将所述用户设备的第一接入网服务站点从当前服务站点切换到所述第一 接入网切换服务器。
交互单元 92, 用于在所述用户设备从所述第二接入网切换回所述第一接入 网前, 通过所述第二接入网中的隧道与所述第一接入网切换服务器交互, 进行 所述第一接入网中从所述切换服务器到用户设备的目标站点的切换。
附着单元 93 , 用于使所述用户设备在所述第一接入网的目标站点上进行附 着, 完成从所述第一接入网切换服务器到目标站点的切换。
如图 9所示, 该切换设备还可以包括:
发送单元 94, 用于定期或者不定期通过所述隧道向所述第一接入网切换服 务器发送消息以保持所述用户设备在所述第一接入网的在网状态。
上述各单元的实现在前述方法的描述中已述及, 此处不赘。
本发明实施例提供的用户设备在从第一接入网向第二接入网的切换过程 中, 将所述用户设备的第一网络服务站点从当前服务站点切换到所述第一接入 网切换服务器; 用户设备从所述第二接入网切换回所述第一接入网前, 通过所 述隧道与所述第一接入网切换服务器交互, 进行所述第一接入网中从所述切换 服务器到用户设备的目标站点的切换; 用户设备在所述第一接入网的目标站点 上进行附着, 完成从所述第一接入网切换服务器到目标站点的切换。 因此当用 户设备切换到第二接入网时, 第一接入网仍然保留着用户设备的上下文信息, 当用户设备需要从第二接入网切换回第一接入网时, 再通过隧道从所述第一接 入网的切换服务器切换到目标站点, 完成回到第一接入网的过程。 与现有技术 相比, 不必重新经过第一接入网的预认证、 密钥分发等过程, 步骤较少, 使得 单射频切换模式下的多模用户设备从第一接入网切换到第二接入网后 , 能够迅 速切换回原来的第一接入网。
本领域技术人员还可以意识到, 结合本文中所公开的实施例描述的各示例 的单元及实现步驟, 能够以电子硬件、 计算机软件或者二者的结合来实现, 为 了清楚地说明硬件和软件的可互换性, 在上述说明中已经按照功能一般性地描 述了各示例的组成及步驟。 这些功能究竟以硬件还是软件方式来执行, 取决于 技术方案的特定应用和设计约束条件。 本领域技术人员可以对每个特定的应用 来使用不同方法来实现所描述的功能, 但是这种实现不应认为超出本发明的范 围。
结合本文中所公开的实施例描述的方法步驟, 可以用硬件、 处理器执行的 软件模块, 或者二者的结合来实施。 软件模块可以置于随机存储器(RAM )、 内 存、 只读存储器(ROM )、 电可编程 ROM、 电可擦除可编程 ROM、 寄存器、 硬 盘、 可移动磁盘、 CD-ROM、 或任意其它形式的存储介质中。
上述具体实施例并不用以限制本发明 , 对于本技术领域的普通技术人员来 说, 凡在不脱离本发明原理的前提下, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。

Claims

权利要求
1、 一种切换方法, 其特征在于, 包括:
用户设备从第一接入网向第二接入网切换时, 获取第一接入网切换服 务器的地址;
将用户设备的附着点从第一接入网服务站点切换到所述第一接入网切 换服务器;
用户设备在第二接入网完成入网后, 与所述第一接入网切换服务器建 立隧道, 并通过该隧道与所述第一接入网切换服务器进行交互, 进行对所 述第一接入网切换服务器的附着, 并进入所述第一接入网的空闲模式; 用户设备从所述第二接入网切换回所述第一接入网时 , 在所述第一接 入网的目标站点上进行附着, 以退出所述空闲模式并重新接入所述第一接 入网。
2、 根据权利要求 1所述切换方法, 其特征在于, 所述获取第一接入网 切换服务器的地址包括:
用户设备通过动态主机配置协议 DHCP,或者通过域名系统 DNS解析, 或者通过在初始入网时请求 IP地址的过程中 , 或者通过查询专用的信息服 务器, 获取第一接入网切换服务器的地址。
3、根据权利要求 1所述切换方法,其特征在于,当第一接入网为 WiMAX 接入网时, 将所述用户设备的附着点从第一接入网服务站点切换到所述第 一接入网切换服务器, 包括:
用户设备向所述第一接入网服务站点发送切换请求消息, 由所述第一 接入网服务站点与所述第一接入网切换服务器交换切换相关的信息;
用户设备通过所述第一接入网服务站点接收所述第一接入网服务站点 返回的切换响应消息;
根据所述切换响应消息, 用户设备向所述第一接入网服务站点发送切 换指示消息, 由所述第一接入网服务站点向所述第一接入网切换服务器发 送切换确认消息。
4、 根据权利要求 1所述切换方法, 其特征在于, 在用户设备与所述第 一接入网切换服务器建立隧道, 并通过该隧道与所述第一接入网切换服务 器进行交互, 进行对所述第一接入网切换服务器的附着, 并进入所述第一 接入网的空闲模式之后, 所述方法还包括:
用户设备定期通过该隧道向所述第一接入网切换服务器发送消息以保 持空闲模式。
5、根据权利要求 1所述切换方法,其特征在于,当第一接入网为 WiMAX 接入网时, 用户设备从所述第二接入网切换回所述第一接入网时 , 在所述 第一接入网的目标站点上进行附着, 以退出所述空闲模式并重新接入所述 第一接入网, 包括:
用户设备选定第一接入网目标站点; 拆除和所述第一接入网切换服务 器之间的隧道; 关闭第二接入网射频, 开启第一接入网射频; 在第一接入 网目标站点上执行退出空闲模式的测距过程。
6、 一种切换方法, 其特征在于, 包括:
用户设备获取第一接入网切换服务器的 IP地址;
用户设备切换到第二接入网后, 与所述第一接入网切换服务器建立 IP 隧道, 通过所述隧道与所述第一接入网切换服务器交互, 进行所述第一接 入网中从所述用户设备的服务站点到所述切换服务器的切换;
用户设备通过所述隧道从所述切换服务器进入所述第一接入网的空闲 模式;
用户设备从所述第二接入网切换回所述第一接入网时 , 在所述第一接 入网的目标站点上进行附着, 以退出所述空闲模式并重新接入所述第一接 入。
7、 根据权利要求 6所述切换方法, 其特征在于, 所述获取第一接入网 切换服务器的 IP地址包括: 在所述用户设备从第一接入网向所述第二接入网切换之前获得第一接 入网切换服务器的 IP地址; 或,
在所述用户设备从第一接入网向所述第二接入网切换之后获得第一接 入网切换服务器的 IP地址。
8、根据权利要求 6所述切换方法,其特征在于,当第一接入网为 WiMAX 接入网时, 所述通过所述隧道与所述第一接入网切换服务器交互, 进行所 述第一接入网中从所述用户设备的服务站点到所述切换服务器的切换, 具 体包括:
所述用户设备通过所述隧道向所述第一接入网切换服务器发送测距请 求消息, 在所述测距请求消息中包含所述用户设备的服务站点的标识信息; 所述第一接入网切换服务器收到所述测距请求后, 至少从所述用户设 备的服务站点获得所述用户设备的上下文信息, 为所述用户设备建立数据 路径;
所述第一接入网切换服务器向所述用户设备发送测距响应消息; 所述第一接入网切换服务器与所述用户设备的服务站点交互, 确认完 成切换。
9、 根据权利要求 6所述切换方法, 其特征在于, 在用户设备通过所述 隧道从所述切换服务器进入所述第一接入网的空闲模式之后 , 所述方法还 包括:
用户设备定期通过所述隧道向所述第一接入网切换服务器发送消息以 保持空闲模式。
10、 根据权利要求 6 所述切换方法, 其特征在于, 当第一接入网为 WiMAX接入网时, 用户设备从所述第二接入网切换回所述第一接入网时 , 在所述第一接入网的目标站点上进行附着, 以退出所述空闲模式并重新接 入所述第一接入网, 具体包括:
所述用户设备选定第一接入网目标站点; 拆除和所述第一接入网切换 服务器之间的隧道; 关闭第二接入网射频, 开启第一接入网射频; 在第一 接入网目标站点上执行退出空闲模式的测距过程。
11、 一种切换设备, 其特征在于, 包括:
切换服务器获取单元, 用于在用户设备从第一接入网向第二接入网切 换时, 获取第一接入网切换服务器的地址;
附着点切换单元, 用于将用户设备的附着点从第一接入网服务站点切 换到所述第一接入网切换服务器;
切回准备单元, 用于用户设备在第二接入点完成入网后, 与所述第一 接入网切换服务器建立隧道, 并通过该隧道与所述第一接入网切换服务器 进行交互, 进行对所述第一接入网切换服务器的附着, 并进入所述第一接 入网的空闲模式;
切回单元, 用于用户设备从所述第二接入网切换回所述第一接入网时, 在所述第一接入网的目标站点上进行附着, 以退出所述空闲模式并重新接 入所述第一接入网。
12、 根据权利要求 11所述切换设备, 其特征在于, 所述第一接入网为 WiMAX接入网 ,所述附着点切换单元具体用于用户设备向第一接入网服务 站点发送切换请求消息, 由第一接入网服务站点与所述第一接入网切换服 务器交换切换相关信息; 通过所述第一接入网服务站点接收第一接入网服 务站点返回的切换响应消息; 根据所述切换响应消息, 用户设备向所述第 一接入网服务站点发送切换指示消息, 由所述第一接入网服务站点向所述 第一接入网切换服务器发送切换确认消息。
13、根据权利要求 11所述切换设备, 其特征在于, 所述切回准备单元, 还用于用户设备定期通过与所述第一接入网切换服务器建立的隧道向所述 第一接入网切换服务器发送消息以保持空闲模式。
14、 根据权利要求 11所述切换设备, 其特征在于, 所述切回单元具体 用于用户设备选定第一接入网目标站点; 拆除和所述第一接入网切换服务 器之间的隧道; 关闭第二接入网射频, 开启第一接入网射频; 在第一接入 网目标站点上执行退出空闲模式的测距过程。
15、 根据权利要求 11至 14任一项所述切换设备, 其特征在于, 所述 切换设备设置在用户设备上。
16、 一种切换设备, 其特征在于, 包括:
切换服务器 IP地址获取单元, 用于在用户设备从第一接入网向第二接 入网切换前或切换后, 获取所述第一接入网切换服务器的 IP地址;
重入切换单元, 用于在所述用户设备从所述第一接入网向所述第二接 入网切换后, 与所述第一接入网切换服务器建立 IP隧道, 通过该隧道从所 述第一接入网切换服务器重入所述第一接入网并触发所述第一接入网将所 述用户设备的附着点从所述第一接入网服务站点切换到所述第一接入网切 换服务器;
空闲模式控制单元, 用于所述用户设备在通过所述隧道完成从所所述 第一接入网服务站点向所述第一接入网切换服务器的切换后, 通过所述隧 道与所述第一接入网切换服务器交互 , 进入所述第一接入网的空闲模式; 切回单元, 用于所述用户设备从所述第二接入网切换回所述第一接入 网时, 在所述第一接入网的目标站点上进行附着, 以退出所述空闲模式并 重新进入所述第一接入网。
17、 根据权利要求 16所述切换设备, 其特征在于, 所述第一接入网为 WiMAX接入网 ,所述重入切换单元具体用于向所述第一接入网服务器发送 测距请求消息 , 触发所述第一接入网切换服务器将所述用户设备从所述用 户设备的服务站点切换到所述切换服务器; 接收所述第一接入网切换服务 器的测距响应消息。
18、 根据权利要求 16所述切换设备, 其特征在于, 所述空闲模式控制 单元, 还用于定期通过与所述第一接入网切换服务器建立的隧道向所述第 一接入网切换服务器发送消息以保持空闲模式。
19、 根据权利要求 16所述切换设备, 其特征在于, 所述切回单元具体 用于用户设备选定第一接入网目标站点; 拆除和所述第一接入网切换服务 器之间的隧道; 关闭第二接入网射频, 开启第一接入网射频; 在第一接入 网目标站点上执行退出空闲模式的测距过程。
20、 根据权利要求 16至 19任一项所述切换设备, 其特征在于, 所述 切换设备设置在所述用户设备上。
21、 一种切换方法, 其特征在于, 包括:
用户设备在从第一接入网向第二接入网的切换过程中, 将所述用户设 备的第一接入网服务站点从当前服务站点切换到所述第一接入网切换服务 器;
所述用户设备从所述第二接入网切换回所述第一接入网前, 通过所述 第二接入网中的隧道与所述第一接入网切换服务器交互, 进行所述第一接 入网中从所述切换服务器到所述用户设备目标站点的切换;
所述用户设备在所述第一接入网的目标站点上进行附着, 完成从所述 第一接入网切换服务器到所述目标站点的切换。
22、 根据权利要求 21所述切换方法, 其特征在于, 所述用户设备从所 述第二接入网切换回所述第一接入网前还包括:
所述用户设备定期或不定期通过所述隧道向所述第一接入网切换服务 器发送消息以保持所述用户设备在所述第一接入网的在网状态。
23、 根据权利要求 21所述切换方法, 其特征在于, 所述将所述用户设 备的第一接入网服务站点从当前服务站点切换到所述第一接入网切换服务 器之后还包括:
所述第一接入网启动定时器, 在所述定时器超时前保持所述用户设备 在网状态。
24、 一种切换设备, 包括:
服务器切换单元, 用于在用户设备从第一接入网向第二接入网的切换 过程中 , 将所述用户设备的第一接入网服务站点从当前服务站点切换到所 述第一接入网切换服务器。
交互单元, 用于在所述用户设备从所述第二接入网切换回所述第一接 入网前, 通过所述第二接入网中的隧道与所述第一接入网切换服务器交互, 进行所述第一接入网中从所述切换服务器到用户设备的目标站点的切换。
附着单元, 用于使所述用户设备在所述第一接入网的目标站点上进行 附着, 完成从所述第一接入网切换服务器到目标站点的切换。
25、 根据权利要求 24所述的切换设备, 其特征在于, 还包括: 发送单元, 用于定期或不定期通过所述隧道向所述第一接入网切换服务器 发送消息以保持所述用户设备在所述第一接入网的在网状态。
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