CN102892157B - WLAN keeps the method and system of continuation when switching to WLAN or 3G - Google Patents

Abstract

The invention discloses a method and system for maintaining continuity when switching from WLAN to WLAN or 3G, including: a gateway device judges the cause of de-association according to the received de-association message sent by the first port of the access point; Receive a connection request message sent by the WLAN terminal before the timing ends; when the connection request message is an association request message between the WLAN terminal and the second port of the access point, the gateway device carries the PDP context The PDP IP address used in the last association of the WLAN terminal is allocated to the WLAN terminal for network switching; when the connection request message is the PDP context activation request message in the 3G service establishment request, the gateway device feeds back a PDP context activation response message to perform network switching. The invention does not need to add new network elements, realizes the continuity of services when switching between networks, and saves equipment upgrade costs.

Description

Method and system for maintaining continuity when switching from WLAN to WLAN or 3G

technical field

The invention relates to the technical field of wireless network switching, in particular to a method and system for maintaining continuity when switching from WLAN to WLAN or 3G.

Background technique

The home gateway (HGW) is the hub for the connection and intercommunication between the home network and the telecom operator's network. It provides networking means for each terminal in the home network, and is responsible for the intercommunication and remote control between the public network and each subnet of the network (PC, telephone, home appliance, lighting, etc.), and it is also the way for users to obtain various value-added from the telecommunications network and the Internet. service channel.

With the popularity of smart terminals, traditional 3G networks are facing unprecedented challenges. As a flexible broadband wireless IP access method, WLAN technology has been clearly recognized by the industry due to its high access rate, convenient architecture, and low system cost. Compared with the rapid development of WLAN, the overall commercialization of 3G is relatively slow; therefore, the demand for integration is becoming more and more obvious.

At present, WLAN solves the problem of bandwidth, but fails to solve the problem of mobility. Users can use WLAN to access the Internet at high speed in hotspot areas; on the contrary, traditional 3G uses the existing network coverage to achieve mobility, but in terms of bandwidth Compared with WLAN, it is much different. Therefore, the complementary advantages of WLAN and 3G network will surely become the main trend of future development.

However, in the face of the current situation, we need to implement switching from WLAN access to WLAN or 3G access, and must ensure service continuity and stability during the switching process.

In the prior art, a new network element needs to be added in a technical solution for maintaining service continuity during inter-network handover, which is complex to implement and expensive to upgrade equipment.

Contents of the invention

The present invention provides a method and system for maintaining continuity when switching from WLAN to WLAN or 3G, without adding new network elements, ensuring service continuity when switching between networks, saving equipment upgrade costs, and improving user experience.

The present invention provides a method for maintaining continuity when switching from WLAN to WLAN or 3G, and the method includes:

The gateway device judges the cause of the de-association according to the received de-association message sent by the first port of the access point. If the de-association is normal, release all resources, otherwise start timing;

The gateway device detects whether the connection request message sent by the WLAN terminal is received before the timing ends, if the connection request message is not received, the packet data protocol PDP context is released, otherwise the type of the connection request message is judged, and the timing is stopped ;

When the connection request message is an association request message between the WLAN terminal and the second port of the access point, the gateway device assigns the PDP IP address used in the last association carried in the PDP context to the The WLAN terminal described above performs network switching;

When the connection request message is the PDP context activation request message in the 3G service establishment request, the gateway device feeds back a PDP context activation response message to perform network switching, wherein the PDP context activation response message carries the last association maintenance PDP IP address.

Wherein, the PDP context activation request message carries a network access point identifier.

Wherein, before the gateway device determines the cause of the de-association according to the received de-association message sent by the first port of the access point, it also includes: maintaining and saving the PDP IP address assigned to the WLAN terminal in this association and the last PDP context The mapping relationship between the network access point identifier and the radio access bearer ID carried in the activation request message.

Wherein, before sending the PDP context activation response message, it also includes:

Establishing a mapping relationship between the network access point identifier carried in the current PDP context activation request message and the radio access bearer ID;

According to the mapping relationship between the network access point identifier carried in the last PDP context activation request message and the radio access bearer ID, the last PDP context is searched.

Wherein, the method further includes: the gateway device converts all signaling between the WLAN network and the 3G network, and converts between 3GPP and IEEE 802.11 protocol data formats.

The present invention provides a system for maintaining continuity when switching from WLAN to WLAN or 3G, including:

The gateway device is used to determine the cause of the de-association according to the received de-association message sent by the first port of the access point. If it is a normal de-association, then release all resources, otherwise start timing; detect whether the WLAN terminal is received before the end of the timing If the connection request message sent by the terminal is not received, the packet data protocol PDP context is released, otherwise the type of the connection request message sent by the terminal is judged, and timing is stopped; when the connection The request message is an association request message between the WLAN terminal and the second port of the access point, and the gateway device is used to assign the PDP IP address used in the last association carried in the PDP context to the WLAN terminal , to perform network switching; if the connection request message is a PDP context activation request message in a 3G service establishment request, the gateway device is used to feed back a PDP context activation response message to perform network switching, wherein the PDP context activation response message is Carry the PDP IP address maintained during the last association.

The terminal is used to send a connection request message to the gateway device, and receive the PDPIP address assigned when reassociated.

The access point is used for data transmission between the terminal and the gateway device, and is also used for sending a de-association message with the terminal to the gateway device;

The home base station is used to establish a radio access bearer.

Wherein, the gateway device includes:

The receiving module receives the deassociation message sent by the first port of the access point;

A sending module, when the connection request message is an association request message between the terminal and the second port of the access point, it is used to send the PDP IP address used in the first association carried in the packet data protocol PDP context to the terminal; when The connection request message is a PDP context activation request message in the 3G service establishment request, and is used to send a PDP context activation response message, and the PDP context activation response message carries the PDP IP address maintained during the first association; The PDP IP address maintained during the first association is given to the terminal.

The wireless local area network access control module is used to determine the reason for the de-association. If it is a normal de-association, then release all resources, otherwise it will start timing; it is also used to detect whether the connection request message sent by the WLAN terminal is received before the end of the timing. If there is no Receiving the connection request message sent by the terminal releases the packet data protocol PDP context, otherwise judges the received connection request message type sent by the terminal, and stops timing;

Switch control sub-modules for network switching;

The PDP context agent sub-module is used to maintain the radio access bearer and its corresponding PDP context, the allocated PDP IP address, and the mapping relationship between the network access point identifier carried in the PDP context activation request message and the radio access bearer ID .

Wherein, the gateway device also includes:

The protocol conversion module is used for the conversion of all signaling between the WLAN network and the 3G network, as well as the mutual conversion of the data formats of the 3GPP and IEEE802.11 protocols.

Compared with the prior art, the embodiment of the present invention has the following advantages: by integrating wireless local area network access control in the gateway device, there is no need to add new network element devices, which ensures the continuity of services when switching between networks and saves equipment upgrades costs and improve user experience.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1: is the flow chart of the method for maintaining continuity when WLAN of the present invention switches to WLAN or 3G;

Fig. 2: is the structural diagram of the system that maintains continuity when switching from WLAN to WLAN or 3G in the present invention;

Fig. 3 is a schematic structural diagram of the gateway device in the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

The embodiment of the present invention provides a method for maintaining continuity when switching from WLAN to WLAN or 3G, as shown in Figure 1, including the following steps:

Step S101, the gateway device judges the cause of the de-association according to the received de-association message sent by the first port of the access point, if the de-association is normal, execute step S102, otherwise execute step S103;

Step S102, releasing all resources;

Step S103, start timing;

Step S104, the gateway device detects whether the connection request message sent by the WLAN terminal is received before the end of the timer, if the connection request message is not received, then execute step S105, otherwise execute step S106;

Step S105, releasing the packet data protocol PDP context;

Step S106, judge the type of the connection request message, and stop timing.

When the connection request message is an association request message between the WLAN terminal and the second port of the access point, perform step S107;

Step S107, the gateway device assigns the PDP IP address used in the last association carried in the PDP context to the WLAN terminal to perform network switching;

When the connection request message is the PDP context activation request message in the 3G service establishment request, step S108 is performed;

Step S108, the gateway device feeds back a PDP context activation response message to perform network switching, wherein the PDP context activation response message carries the PDP IP address maintained during the last association.

Wherein, the PDP context activation request message carries a network access point identifier.

Wherein, before the gateway device determines the cause of the de-association according to the received de-association message sent by the first port of the access point, it also includes: maintaining and saving the PDP IP address assigned to the WLAN terminal in this association and the last PDP context The mapping relationship between the network access point identifier and the radio access bearer ID carried in the activation request message.

Wherein, before sending the PDP context activation response message, it also includes:

Establishing a mapping relationship between the network access point identifier carried in the current PDP context activation request message and the radio access bearer ID;

According to the mapping relationship between the network access point identifier carried in the last PDP context activation request message and the radio access bearer ID, the last PDP context is searched.

After the WLAN terminal connects to the AP through the standard WW port, the AP communicates with the AC through the CAPWAP port. Protocol conversion is added in the gateway for WLAN and 3GPP protocol signaling and data format conversion between AC and HGW, and the converted signaling and data are communicated through the standard IU interface between HGW and CN.

The method further includes: the gateway device converts all signaling between the WLAN network and the 3G network, and converts between 3GPP and IEEE 802.11 protocol data formats.

In addition, the present invention also provides a system for maintaining continuity when switching from WLAN to WLAN or 3G, as shown in Figure 2, the system includes:

The gateway device 101 is configured to judge the cause of the de-association according to the received de-association message sent by the first port of the access point, if it is a normal de-association, then release all resources, otherwise start timing; detect whether the WLAN is received before the end of the timing The connection request message sent by the terminal, if the connection request message sent by the terminal is not received, the packet data protocol PDP context is released, otherwise the type of the connection request message sent by the terminal is judged, and timing is stopped; when the The connection request message is an association request message between the WLAN terminal and the second port of the access point, and the gateway device is used to assign the PDP IP address used in the last association carried in the PDP context to the WLAN The terminal performs network switching; if the connection request message is a PDP context activation request message in the 3G service establishment request, the gateway device is used to feed back a PDP context activation response message to perform network switching, wherein the PDP context activation response message Carry the PDP IP address maintained during the last association.

The terminal 102 is configured to send a connection request message to the gateway device, and receive the PDP IP address assigned when re-association.

The access point 103 is used for data transmission between the terminal and the gateway device, and is also used for sending a disassociation message with the terminal to the gateway device;

The home base station 104 is configured to establish a radio access bearer.

Wherein, the gateway device 101 includes:

The receiving module 1011 is configured to receive the disassociation message sent by the first port of the access point;

A sending module 1012, when the connection request message is an association request message between the terminal and the second port of the access point, configured to send the PDP IP address used in the first association carried in the packet data protocol PDP context to the terminal; When the connection request message is the PDP context activation request message in the 3G service establishment request, it is used to send a PDP context activation response message, and the PDP context activation response message carries the PDP IP address maintained when first associated; The PDP IP address maintained during the first association is given to the terminal.

Wireless local area network access control module 1013, is used for judging the cause of de-association, if it is normal de-association, then release all resources, otherwise start timing; also be used for detecting whether to receive the connection request message that WLAN terminal sends before timing ends, if If the connection request message sent by the terminal is not received, the packet data protocol PDP context is released, otherwise the type of the connection request message sent by the received terminal is judged, and timing is stopped;

Handover control sub-module 1014, to perform network handover;

The PDP context proxy submodule 1015 is configured to maintain the radio access bearer and its corresponding PDP context, the assigned PDP IP address, and the connection between the network access point identifier carried in the PDP context activation request message and the radio access bearer ID Mapping relations.

Wherein, the gateway device 101 also includes:

The protocol converting module 1016 is used for converting all signaling between the WLAN network and the 3G network, as well as converting between 3GPP and IEEE 802.11 protocol data formats.

In this technical solution, after the WLAN terminal is connected to the AP through a standard WW port, the AP and the AC communicate through the CAPWAP interface. A protocol conversion module is added to the gateway for WLAN and 3GPP protocol signaling and data format conversion between AC and HGW, and the converted signaling and data are communicated through the standard IU interface between HGW and CN.

The 3G network has continuous coverage, and the WLAN hotspots are distributed in different places.

Switching between WLANs: When the user moves to the coverage of another WLAN, the user releases the connection with the original WLAN and initiates a connection with another WLAN due to the deterioration of the signal of the original WLAN; business continuity in the process;

Switching between WLAN and 3G: When the user moves out of the coverage area of the WLAN signal of the HNB and enters the coverage area of the 3G signal of the HNB only, the user initiates the release of the original WLAN connection due to the deterioration of the original connection WLAN signal, and when the 3G signal is detected, A service establishment request is initiated in the 3G network. At this time, according to the processing of the gateway device, the continuity of the service during the moving process is maintained.

This technical solution involves a total of 3 processes:

First of all, in the process of terminal access to WLAN AN, it is necessary to maintain the integrated PDP context related information, such as: mixed RAB ID, PDP Address;

In the process of handover from WLAN access to WLAN access, it is necessary to keep the IP addresses assigned to WLAN terminals consistent before and after the handover, so as to maintain service continuity;

In the process of switching from WLAN access to 3G access, the IP address assigned to the terminal needs to be consistent before and after the switch to maintain service continuity; at the same time, in the above process, after the WLAN is disconnected, the PDP context needs to wait for a timer Aging time (aging time), within the aging time, if the UE initiates a data service (via WLAN or 3G), the service will be switched. If the UE does not initiate a data service within the aging time, the data connection will be considered disconnected. The PDP context proxy submodule releases the maintained PDP information.

The beneficial effects brought by the technical solutions of the embodiments of the present invention are as follows: By adjusting the parallax generated when shooting 3D video, the 3D video can achieve the best video effect, and people's visual fatigue can be avoided during the viewing process.

Through the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be realized by hardware, or by software plus a necessary general hardware platform. Based on this understanding, the technical solution of the present invention can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.), including several The instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present invention.

Those skilled in the art can understand that the drawing is only a schematic diagram of a preferred embodiment, and the units or processes in the drawing are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the units in the system in the embodiment can be distributed in the device of the embodiment according to the description of the embodiment, or can be located in one or more devices different from the embodiment according to the corresponding changes. The units in the above embodiments can be combined into one unit, and can also be further divided into multiple subunits.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The above embodiments are only used to illustrate the technical solutions of the present invention rather than limit them, and the present invention is described in detail with reference to preferred embodiments. Those skilled in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and all should be covered by the claims of the present invention.

Claims (8)

1. The method that 1.WLAN keeps continuation when switching to WLAN or 3G, it is characterised in that this method includes：

   Gateway device goes association messages to judge to go to associate reason according to what the access point first port received was sent, if just Often go to associate, then discharge all resources, otherwise start timing；

   The gateway device detects whether to receive the connection request message of WLAN terminal transmission before timing terminates, if not receiving Packet data protocol PDP Context is then discharged to the connection request message, otherwise judges the type of the connection request message, And stop timing；

   It is when association request message of the connection request message between the WLAN terminal and access point second port, then described It is whole that the PDP IP address used during the last association that gateway device will carry in the PDP Context distributes to the WLAN End, carry out network switching；

   When the connection request message is the PDP context activation request message that 3G business is established in request, then the gateway is set Standby feedback PDP context activation response message, carries out network switching, wherein being carried in the PDP context activation response message The PDP IP address safeguarded during last time association.
2. 2. according to the method for claim 1, it is characterised in that carry network in the PDP context activation request message Access Point Identifier.
3. 3. according to the method for claim 2, it is characterised in that the gateway device is according to the access point first end received What mouth was sent goes association messages to judge to go before association reason, in addition to：Safeguard and preserve and WLAN ends are distributed in this secondary association Carrying network insertion point identifier in the PDP IP address at end and last PDP context activation request message is with wirelessly connecing Enter to carry the mapping relations between ID.
4. 4. according to the method for claim 2, it is characterised in that before the feedback PDP context activation response message, also Including：

   Establish in this PDP context activation request message and carry the mapping of network insertion point identifier and RAB ID Relation；

   Carrying network insertion point identifier and the RAB in last PDP context activation request message Mapping relations between ID, search last PDP Context.
5. 5. according to the method for claim 1, it is characterised in that methods described also includes：The gateway device is to WLAN nets The conversion of whole signalings between network and 3G network, and 3GPP and the protocol data forms of IEEE 80 2.11 mutual conversion.
6. The system that 6.WLAN keeps continuation when switching to WLAN or 3G, including：

   Gateway device, association messages are gone to judge to go to associate reason for what is sent according to the access point first port received, such as Fruit is normally to go to associate, then discharges all resources, otherwise start timing；Detect whether to receive WLAN terminal before timing terminates The connection request message of transmission, discharge packet data protocol PDP if the connection request message of the terminal transmission is not received Context, otherwise judges the type for the connection request message that the terminal received is sent, and stops timing；When the connection Association request message of the request message between the WLAN terminal and access point second port, the gateway device are used for institute State the PDP IP address used during the last association carried in PDP Context and distribute to the WLAN terminal, carry out network and cut Change；If the connection request message is the PDP context activation request message that 3G business is established in request, the gateway device is used In feedback PDP context activation response message, network switching is carried out, wherein being carried in the PDP context activation response message The PDP IP address safeguarded during last time association；

   Terminal, the connection request message for transmission is to the gateway device, and with receiving the PDP IP distributed when associating again Location；

   Access point, for the data transfer between terminal and the gateway device, it is additionally operable to send and removes association messages with terminal To the gateway device；

   Home eNodeB, for establishing RAB.
7. 7. system according to claim 6, it is characterised in that the gateway device, including：

   Receiving module, receive the transmission of access point first port removes association messages；

   Sending module, when the connection request message is terminal and access point second port association request message, for will packet The PDP IP address used during the first secondary association carried in data protocol PDP context is sent to the terminal；When the company The PDP context activation request message that request message is established in request for 3G business is connect, for sending PDP context activation response Message, the PDP IP address safeguarded when carrying the first secondary association in the PDP context activation response message；Distribute described first The PDP IP address safeguarded during secondary association is to terminal；

   WLAN Access Control module, for judging to go to associate reason, if normally going to associate, then discharge all moneys Source, otherwise start timing；It is additionally operable to detect whether the connection request message for receiving WLAN terminal transmission before timing terminates, if Do not receive the connection request message that the terminal is sent and then discharge packet data protocol PDP Context, otherwise judge to receive The connection request message type that sends of the terminal, and stop timing；

   Switching control submodule, carry out network switching；

   PDP Context agent sub-module, for safeguarding RAB and its corresponding PDP Context, the PDP IP of distribution Reflecting between the network insertion point identifier and RAB ID that are carried in address and PDP context activation request message Penetrate relation.
8. 8. system according to claim 6, it is characterised in that the gateway device, in addition to：

   Protocol conversion module, for the conversion to whole signalings between wlan network and 3G network, and 3GPP and IEEE The mutual conversion of 802.11 protocol data forms.