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 PDFInfo
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- 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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- Prior art keywords
- access network
- user equipment
- switching
- switching server
- server
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- 238000000034 method Methods 0.000 title claims abstract description 168
- 230000008569 process Effects 0.000 claims description 91
- 230000004044 response Effects 0.000 claims description 18
- 238000002360 preparation method Methods 0.000 claims description 11
- 230000003993 interaction Effects 0.000 claims description 7
- 238000012790 confirmation Methods 0.000 claims description 6
- 230000005641 tunneling Effects 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000004891 communication Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000006870 function Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 2
- 238000013475 authorization Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/13—Cell handover without a predetermined boundary, e.g. virtual cells
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
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
Claims
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JP2012525869A JP5376185B2 (ja) | 2009-08-28 | 2010-07-29 | ハンドオーバ方法およびハンドオーバ装置 |
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CN2010101165554A CN102006646B (zh) | 2009-08-28 | 2010-02-10 | 一种切换方法和切换设备 |
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WO2015076345A1 (ja) * | 2013-11-25 | 2015-05-28 | 京セラ株式会社 | 通信制御方法、ユーザ端末、及びプロセッサ |
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CN113225369A (zh) | 2015-01-06 | 2021-08-06 | 安博科技有限公司 | 用于中立应用程序编程接口的系统和方法 |
US10630505B2 (en) | 2015-01-28 | 2020-04-21 | Umbra Technologies Ltd. | System and method for a global virtual network |
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CN106664625B (zh) * | 2015-06-11 | 2019-12-17 | 华为技术有限公司 | 一种用户设备及网络接入方法 |
CN112583744B (zh) | 2015-06-11 | 2023-04-18 | 安博科技有限公司 | 用于网络挂毯多协议集成的系统和方法 |
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US20120157102A1 (en) | 2012-06-21 |
CN102006646B (zh) | 2012-08-08 |
JP5376185B2 (ja) | 2013-12-25 |
CN102006646A (zh) | 2011-04-06 |
KR101399004B1 (ko) | 2014-05-27 |
RU2503147C2 (ru) | 2013-12-27 |
JP2013503522A (ja) | 2013-01-31 |
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