CN101656993A - Access point switching method and device - Google Patents

Abstract

The embodiment of the invention discloses an access point switching method and device, and relates to the technical field of network communication. In order to solve the problem in the prior art that the destination access point cannot recognize the bypass data if the UE switches the access point during the data interaction process of the UE, the invention is invented. An access point switching method provided by an embodiment of the present invention includes: when the source access point finds that the user equipment in the area of the access point needs to switch the access point, sending a packet data protocol address carrying the user equipment A handover message, so that after the user equipment is handed over to the destination access point, the destination access point sends bypass data to the user equipment according to the address of the user equipment. By adopting the embodiment of the present invention, during the data interaction process of the UE performing data bypass, the UE bypass service data can be continuously performed.

Description

Method and device for access point switching

technical field

The invention relates to the technical field of network communication, in particular to an access point switching technology.

Background technique

At present, the networking of a user equipment (User Equipment, UE) accessing a packet data network through an access point (Access Point, AP) is shown in Figure 1;

The specific process for the UE to access the packet data network is: the UE accesses the access point and the home gateway (Home Gateway, HGW) in the user's local network through the air interface in turn; and then accesses the IP network through the home gateway HGW. Then, through the IP transmission network, it is connected to the security gateway (Security Gateway, SeGW) and the access gateway (Access Gateway, AG) in the mobile core network in turn, and then connected to the circuit domain (Circuit Switched domain, CS) core network is connected to the packet domain (PacketSwitched domain, PS) core network; finally, the UE can obtain information from the packet data network through the Gateway GPRS Support Node (GGSN) in the PS domain core network. Wherein, the AP is a network device that provides wireless access services for home/enterprise user equipment based on a fixed IP transmission network; the AP includes the functions of a base station NodeB and a radio network controller (Radio Network Controller, RNC), The AG contains the RNC proxy function.

Since the UE accesses the Internet in the packet data network through the AP, it needs to exchange data with the Internet through the Gi interface of the GGSN network element in the PS domain core network. In this way, the traffic of the UE to access the Internet needs to pass through the mobile core network, which occupies the bandwidth of the mobile core network. For this reason, the operator puts forward the requirement of data bypass, that is, the UE can carry out local data exchange between the AP and the IP device (such as: PC) in the local network to carry out services in the local network; at the same time, the UE can also Directly access the Internet through the AP to reduce the traffic of the mobile core network and improve the system performance of the mobile core network. The AP integrates the GGSN function.

The inventor finds that at least the following problems exist in the prior art: in the prior art, the UE can directly access the Internet in the packet data network through the AP through the bypass data technology. However, during the data interaction process of the UE performing the data bypass, if the UE undergoes AP switching, the bypass data interaction of the UE will be interrupted.

Contents of the invention

The embodiments of the present invention provide an access point switching method and device, so as to ensure the continuity of the bypass data service when the UE performs AP switching when the UE performs bypass data information exchange.

In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

On the one hand, an embodiment of the present invention provides an access point switching method, including:

When the source access point finds that the user equipment in the area of the access point needs to switch the access point,

sending a switching message carrying the packet data protocol address of the user equipment, so that after the user equipment is switched to a destination access point, the destination access point sends bypass data to the user equipment according to the address of the user equipment .

On the other hand, an embodiment of the present invention provides an access point switching method, including:

receiving a handover request message carrying the packet data protocol address of the user equipment;

After the user equipment switches to the local access point area, send bypass data to the user equipment according to the packet data protocol address of the user equipment.

In another aspect, an access point switching device provided by an embodiment of the present invention includes:

A detection unit, configured to detect whether the user equipment in the area of the access point needs to switch the access point;

a message sending unit, configured to send a handover message carrying the packet data protocol address of the user equipment, so that after the user equipment is handed over to a destination access point, the destination access point sends a message to the user equipment according to the address of the user equipment The user equipment sends bypass data.

In another aspect, an access point switching device provided by an embodiment of the present invention includes:

a message receiving unit, configured to receive a handover request message carrying the packet data protocol address of the user equipment;

The data sending unit is configured to send bypass data to the user equipment according to the packet data protocol address of the user equipment after the user equipment switches to the local access point area.

An access point switching method and device provided in an embodiment of the present invention, when the source access point finds that the user equipment in the access point area needs to switch the access point, send the packet data protocol address carrying the user equipment handover message, so that after the user equipment is handed over to the destination access point, the destination access point sends bypass data to the user equipment according to the address of the user equipment. Compared with the prior art, during the data interaction process of the user equipment UE, if the UE switches the access point AP, the target AP cannot recognize the bypass data, thereby interrupting the bypass data interaction of the UE In contrast, in the embodiment of the present invention, after the UE is handed over to the target access point through the access point handover, the target access point sends bypass data to the user equipment according to the address of the user equipment, ensuring that the user equipment During the handover process between APs, the UE bypasses the continuity of service data.

Description of drawings

FIG. 1 is a network diagram of a user equipment accessing a packet data network through an access point;

FIG. 2 is a flowchart of an access point switching method provided by an embodiment of the present invention;

FIG. 3 is a flow chart of another access point switching method provided by an embodiment of the present invention;

FIG. 4A is a schematic structural diagram of an access point switching device as a source access point device provided by an embodiment of the present invention;

FIG. 4B is a schematic structural diagram of another access point switching device provided by an embodiment of the present invention being a source access point device;

FIG. 5A is a schematic structural diagram of an access point switching device as a destination access point device according to an embodiment of the present invention;

FIG. 5B is a schematic structural diagram of another access point switching device as a destination access point device according to an embodiment of the present invention;

FIG. 6 is a flow chart of an access point switching method provided by an embodiment of the present invention;

FIG. 7 is a flowchart of another access point switching method provided by an embodiment of the present invention;

FIG. 8 is a flow chart of another access point switching method provided by an embodiment of the present invention.

Detailed ways

A method and device for switching an access point provided by an embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Figure 2, it is an access point switching method provided by the embodiment of the present invention. The specific implementation process of this method is as follows:

201: The source access point AP finds that the user equipment in the area of the access point needs to switch the access point;

202: The source access point AP sends a handover message carrying the packet data protocol address of the user equipment, so that after the user equipment is handed over to the destination access point, the destination access point sends a message to the destination AP according to the address of the user equipment. The user equipment sends bypass data.

Specifically, it may be that the source access point sends a switching message carrying the packet data protocol address of the user equipment to the access gateway, and then the access gateway initiates a switching request to the destination access point, and the request carries the user equipment The packet data protocol address of the device.

Wherein, the packet data protocol address of the user equipment is used by the destination access point to identify the user equipment.

The handover message can be specifically divided into two implementation scenarios to carry the packet data protocol address of the user equipment:

One is that when the source access point and the destination access point are in the same subnet, the packet data protocol address of the user equipment can be carried by adding an information element of the handover message. For example: the information element of an AP layer 2 handover message is extended, and the information element includes: the packet data protocol PDP address of the UE to be handed over. Wherein, the PDP address of the UE to be handed over is used by the target AP to identify the user equipment.

The other is that when the source access point and the destination access point are in the same subnet or different subnets, the packet data protocol address of the user equipment may also be carried by adding an information element of the handover message. For example: an information element of an AP layer 3 handover message is extended, and the information element includes: the PDP address of the UE to be handed over. Wherein, the PDP address of the UE to be handed over is used by the destination AP to search for the UE.

According to an access point switching method provided by an embodiment of the present invention, when the source access point finds that the user equipment in the area of the access point needs to switch the access point, it sends a switching message carrying the packet data protocol address of the user equipment. message, so that after the user equipment is handed over to the destination access point, the destination access point sends bypass data to the user equipment according to the address of the user equipment. Compared with the prior art, the embodiment of the present invention uses access point switching so that after the user equipment is switched to the target access point, the target access point sends a bypass message to the user equipment according to the address of the user equipment. The channel data ensures the continuity of the user equipment bypass service data during the process of switching the user equipment between multiple access points.

It should be noted that the switching message may also carry the address and subnet mask of the active access point, so that the destination access point can judge whether the source access point is compatible with the source access point according to the address and subnet mask of the source access point. Whether the destination access point is in the same subnet; wherein, the address of the source access point is the IP address of the source access point AP.

When the source access point and the destination access point are in the same subnet, the method may perform access point switching through two implementation scenarios, specifically:

Scenario 1: The access point switching process that forwards bypass data directly through the destination access point AP is as follows:

The source access point AP receives the message carrying the switching command, and according to the received switching command, the source access point AP stops sending the dynamic host configuration protocol lease renewal message and stops responding to the address resolution protocol request of the user equipment message; wherein, the DHCP lease renewal message is used for the source AP access point to refresh the lease period of its IP address, thereby ensuring the validity of the IP address; the Address Resolution Protocol (Address Resolution Protocol) of the user equipment , ARP) request response is used to return the IP address of the source access point to the user equipment sending the ARP request.

Scenario 2: The access point switching process for forwarding bypass data through the bypass data channel established between the source access point AP and the destination access point AP is as follows:

The source access point AP receives the handover command sent by the access gateway or the registration request message sent by the destination access point, and the handover command or the registration request message carries the packet data protocol PDP address and The address of the destination access point AP, according to the packet data protocol address of the user equipment and the address of the destination access point, establish a bypass data channel with the destination access point; wherein, the specific method of establishing the bypass data channel There are five types, for details, refer to the description of step 709 as shown in FIG. 7 .

When the source access point and the destination access point are different subnets, the access point switching process of the bypass data is as follows:

The source access point AP receives the handover command sent by the access gateway AG or the registration request message sent by the destination access point, and the handover command or the registration request message carries the packet data protocol address of the user equipment and the destination access and establishing a bypass data channel with the destination access point according to the packet data protocol address of the user equipment and the address of the destination access point. There are five specific ways to establish the bypass data channel, and for details, refer to the description of step 709 shown in FIG. 7 .

It should also be noted that when the handover message carries the address of the source access point and the packet data protocol address of the user equipment, no matter whether the source access point AP and the destination access point AP are in the same subnet, the source access point AP The AP side of the access point can adopt the following access point switching process of bypass data, and the specific switching process is as follows:

The source access point AP receives the switching command sent by the access gateway AG according to the address of the source access point, or the packet data protocol carrying the user equipment sent by the destination access point according to the address of the source access point a registration request message of the address and the address of the destination access point;

The source access point AP establishes a bypass data channel with the destination access point according to the packet data protocol address of the user equipment and the address of the destination access point. There are five specific ways to establish the bypass data channel, and for details, refer to the description of step 709 shown in FIG. 7 .

It is worth noting that the above registration request message is the mobile IP registration request message, which may carry the packet data protocol address of the user equipment and the address of the destination access point; wherein, the packet data protocol address of the user equipment The address may be the PDP address of the UE to be handed over; the address of the destination access point may be the IP address of the destination AP. For example: use the home address field in the mobile IP registration request message to carry the PDP address of the UE to be handed over, and use the care-of address field to carry the IP address of the destination AP.

As shown in FIG. 3, it is an access point switching method provided in an embodiment of the present invention, the method includes:

301: The destination access point receives a handover request message carrying the packet data protocol address of the user equipment;

Specifically, after the access gateway receives the handover message carrying the packet data protocol address of the user equipment sent by the source access point, it sends the message carrying the packet data protocol address of the user equipment to the destination access point. Switch request message.

302: After the user equipment switches to the local access point area, the destination access point sends bypass data to the user equipment according to the packet data protocol address of the user equipment. Wherein, the packet data protocol address of the user equipment is used by the destination access point to identify the user equipment.

According to an access point switching method provided by an embodiment of the present invention, the destination access point receives a switching request message carrying the packet data protocol address of the user equipment; when the user equipment switches to the area of the access point, according to the sending bypass data to the user equipment through the packet data protocol address of the user equipment. Compared with the prior art, the embodiment of the present invention uses access point switching so that after the user equipment is switched to the target access point, the target access point sends a bypass message to the user equipment according to the address of the user equipment. The channel data ensures the continuity of the user equipment bypass service data during the process of switching the user equipment between multiple access points.

It should be noted that when the switch request message also carries the address and subnet mask of the source access point, it is judged according to the address and subnet mask of the source access point whether the points are in the same subnet; wherein, the address of the source access point is the IP address of the source access point AP.

When the source access point and the destination access point are in the same subnet, the method may perform access point switching through two implementation scenarios, specifically:

Scenario 1: The access point switching process that forwards bypass data directly through the destination access point AP is as follows:

After the user equipment completes the handover, the destination access point AP refreshes the media access layer address table and address resolution protocol table, so that the network side entity There are three methods for the destination access point AP to refresh the media access layer address table and the address resolution protocol table, specifically referring to the step 612 in the embodiment of FIG. 6 below.

Scenario 2: The access point switching process for forwarding bypass data through the bypass data channel established between the source access point AP and the destination access point AP is as follows:

The destination access point AP sends a registration request message carrying the packet data protocol address of the user equipment and the address information of the access point to the source access point AP, so that the source access point can register according to the address information of the user equipment. The packet data protocol address and the address information of the access point establish a bypass data channel with the access point, so that the bypass data can be forwarded through the bypass data channel.

When the source access point and the destination access point are different subnets, the access point switching process of the bypass data is as follows:

The destination access point AP sends a registration request message carrying the packet data protocol address of the user equipment and the address information of the access point to the source access point according to the address of the source access point, so that the source access point The access point establishes a bypass data channel with the access point according to the packet data protocol address of the user equipment and the address information of the access point. There are five ways to establish the bypass data channel, and for details, refer to the description of step 709 shown in FIG. 7 .

It should also be noted that when the handover message carries the address of the source access point and the packet data protocol address of the user equipment, no matter whether the source access point AP and the destination access point AP are in the same subnet, the destination The AP side of the access point can adopt the following access point switching process of bypass data, and the specific switching process is as follows:

The destination access point AP sends a registration request message carrying the packet data protocol address of the user equipment and the address information of the access point to the source access point according to the address of the source access point, so that the source access point The access point establishes a bypass data channel with the access point according to the packet data protocol address of the user equipment and the address information of the access point.

It is worth noting that the above registration request message is the mobile IP registration request message, which may carry the packet data protocol address of the user equipment and the address of the destination access point; wherein, the packet data protocol address of the user equipment The address may be the PDP address of the UE to be handed over; the address of the destination access point may be the IP address of the destination AP. For example: use the home address field in the mobile IP registration request message to carry the PDP address of the UE to be handed over, and use the care-of address field to carry the IP address of the destination AP.

As shown in FIG. 4A, it is an access point switching device provided in an embodiment of the present invention. The access point switching device may be a source access point device, and the device includes:

A detection unit 401, configured to detect whether the user equipment in the area of the access point needs to switch the access point;

A message sending unit 402, configured to send a handover message carrying the packet data protocol address of the user equipment, so that after the user equipment is handed over to a destination access point, the destination access point sends a message to the destination access point according to the address of the user equipment. The user equipment sends bypass data.

It should be noted that the switching message may also carry the address and subnet mask of the active access point, so that the destination access point can judge whether the source access point is compatible with the source access point according to the address and subnet mask of the source access point. Whether the destination access point is in the same subnet; wherein, the address of the source access point is the IP address of the source access point AP.

When the source access point and the destination access point are in the same subnet, access point switching can be performed through two implementation scenarios:

Scenario 1 is an access point switching that forwards bypass data directly through the destination access point AP, as shown in Figure 4B, the device may also include:

The first message processing unit 403 is configured to receive a message carrying a handover command, and stop sending a Dynamic Host Configuration Protocol lease renewal message and stop responding to an address resolution protocol request message of the user equipment according to the received handover command; wherein , the dynamic host configuration protocol lease renewal message is used for the source AP access point to refresh the lease period of its IP address, thereby ensuring the validity of the IP address; the address resolution protocol request response of the user equipment is used for the The user equipment sending the ARP request returns the IP address of the source access point.

Scenario 2 is an access point switching for forwarding bypass data through the bypass data channel established between the source access point AP and the destination access point AP. The device may include:

The second message processing unit 404 is configured to receive a handover command sent by the access gateway or a registration request message sent by the destination access point, where the handover command or the registration request message carries the packet data protocol address of the user equipment and The address of the destination access point, establishing a bypass data channel with the destination access point according to the packet data protocol address of the user equipment and the address of the destination access point; wherein, the specific method of establishing the bypass data channel is as follows Five types, for details, refer to the description of step 709 shown in FIG. 7 .

It should also be noted that when the source access point and the destination access point are in the same subnet or not, and the handover message carries the address of the source access point and the packet data protocol address of the user equipment, the bypass All access point switching devices for channel data can process messages through the second message processing unit;

The second message processing unit 404 is also configured to receive a handover command sent by the access gateway AG or a registration request message sent by the destination access point, where the handover command or the registration request message carries the grouping of the user equipment The data protocol address and the address of the destination access point, establishing a bypass data channel with the destination access point according to the packet data protocol address of the user equipment and the address of the destination access point. There are five specific ways to establish the bypass data channel, and for details, refer to the description of step 709 shown in FIG. 7 .

The first message processing unit 403 and the second message processing unit 404 may exist at the same time, or may exist separately in the access point switching device.

An access point switching device provided in an embodiment of the present invention is configured to send a switchover message carrying the packet data protocol address of the user equipment when the source access point finds that the user equipment in the area of the access point needs to switch the access point. message, so that after the user equipment is handed over to the destination access point, the destination access point sends bypass data to the user equipment according to the address of the user equipment. Compared with the prior art, the embodiment of the present invention uses access point switching so that after the user equipment is switched to the target access point, the target access point sends a bypass message to the user equipment according to the address of the user equipment. The channel data ensures the continuity of the user equipment bypass service data during the process of switching the user equipment between multiple access points.

As shown in FIG. 5A, it is another access point switching device provided in an embodiment of the present invention. The access point switching device may be a destination access point device, and the device includes:

A message receiving unit 501, configured to receive a handover request message carrying the packet data protocol address of the user equipment;

The data sending unit 502 is configured to send bypass data to the user equipment according to the packet data protocol address of the user equipment after the user equipment switches to the local access point area.

It should be noted that when the switch request message also carries the address and subnet mask of the source access point, it is judged according to the address and subnet mask of the source access point whether the points are in the same subnet; wherein, the address of the source access point is the IP address of the source access point AP.

When the source access point and the destination access point are in the same subnet, the method may perform access point switching through two implementation scenarios, specifically:

Scenario 1 is when the access point switching directly forwards the bypass data through the destination access point AP, the device may also include:

A judging unit 503, configured to, when the switching request message also carries the address and subnet mask of the source access point, judge whether the source access point is compatible with the current access point according to the address and subnet mask of the source access point. Whether the entry point is the same subnet;

Refresh unit 504, configured to refresh the media access layer address table and the address resolution protocol table when the judging unit judges that it is the same subnet, after the user equipment completes the handover, so that the network side entity The media access layer address table sends the bypass data of the user equipment to the access point; wherein, there are three methods for the destination access point AP to refresh the media access layer address table and the address resolution protocol table, specifically, See the description of step 612 in the embodiment of FIG. 6 below.

Scenario 2 is an access point switching for forwarding bypass data through the bypass data channel established between the source access point AP and the destination access point AP. The device may also include:

A message sending unit 505, configured to send a registration request message carrying the packet data protocol address of the user equipment and the address information of this access point to the source access point, so that the source access point can register according to the user equipment The packet data protocol address and the address information of the access point establish a bypass data channel with the access point.

It should be noted that the judging unit 503, the refreshing unit 504 and the message sending unit 505 described above may exist at the same time, or the judging unit 503 and the message sending unit 505 may exist at the same time. When the entry point and the destination access point do not belong to the same subnet, the message sending unit 505 performs the above actions; or the message sending unit 505 can also exist independently in the access point switching device; at this time, it is not necessary to judge the source access point Whether it belongs to the same subnet as the destination access point or not, the above actions are directly performed by the message sending unit 505 .

It should also be noted that when the handover message carries the source access point address and the packet data protocol address of the user equipment, no matter whether the source access point AP and the destination access point AP are in the same subnet, the source The access point AP side can adopt the following access point switching of bypass data, and the device can also use the message sending unit to send the packet data protocol address and the address of the user equipment to the source access point. A registration request message of the address information of the access point, so that the source access point can establish a bypass data channel with the access point according to the packet data protocol address of the user equipment and the address information of the access point.

An access point switching device provided in an embodiment of the present invention receives a switching request message carrying the packet data protocol address of the user equipment through the destination access point; when the user equipment switches to the area of the access point, according to the sending bypass data to the user equipment through the packet data protocol address of the user equipment. Compared with the prior art, the embodiment of the present invention uses access point switching so that after the user equipment is switched to the target access point, the target access point sends a bypass message to the user equipment according to the address of the user equipment. The channel data ensures the continuity of the user equipment bypass service data during the process of switching the user equipment between multiple access points.

As shown in FIG. 6, it is an access point switching method provided by the embodiment of the present invention, and its specific implementation process is as follows:

601. When the source access point AP finds that the user equipment in the area of the access point needs to switch the access point, the source AP sends the packet data protocol (Packet Data Protocol, PDP) address of the UE to be switched, the address of the source AP, and the subnet address of the source AP. The netmask switching message is sent to the AG to request switching.

602. After receiving the AP switching message, the AG sends a switching request message to the target AP according to the cell ID of the target AP, and requests the target AP to allocate related resources for the UE. Wherein, the handover request message carries the PDP address of the UE to be handed over, the address of the source AP, and the subnet mask. The destination AP can judge that the source AP and the destination AP belong to the same subnet according to the address and subnet mask of the source AP carried in the handover request message; according to the PDP address of the UE to be handed over carried in the handover request message Identify user equipment.

603. After the destination AP receives the handover request message, the destination AP can determine that the source AP and the destination AP belong to the same subnet according to the address and subnet mask of the source AP carried in the handover request message; The PDP address of the UE to be handed over carried in the request message identifies the user equipment, and allocates related resources for the UE and establishes a wireless link.

It should be noted that if the destination AP judges that the source AP and the source AP belong to the same subnet, the handover between the destination AP and the source AP can also transmit bypass data by establishing a bypass data channel. The specific implementation process Refer to the switching process shown in Figure 7 and Figure 8 below.

604. The destination AP returns a handover request response message to the AG.

605. After receiving the handover request response message, the AG sends a message carrying the handover command to the source AP.

606. After receiving the message carrying the handover command, the source AP stops sending downlink data, and sends a radio bearer reconfiguration message to the UE. Wherein, the radio bearer reconfiguration message is used to instruct the UE to establish a radio link with the target AP for handover.

607. After completing the wireless bearer reconfiguration, the source AP stops sending a Dynamic Host Configuration Protocol (Dynamic Host Configuration Protocol, DHCP) lease renewal message DHCP Request and stops responding to the ARP request for the UE. Wherein, the dynamic host configuration protocol lease renewal message is used for the source AP access point to refresh the lease period of its IP address, thereby ensuring the validity of the IP address; the Address Resolution Protocol (Address Resolution Protocol, ARP) of the user equipment ) request response is used to return the IP address of the source access point to the user equipment sending the ARP request. Wherein, the described stopping sending DHCP Request message and stopping responding to ARP request message can stop updating of the Media Access Layer (MediaAccess Control, MAC) address table and ARP table of the equipment connected to the AP, so that the purpose AP refreshes the MAC and ARP tables After that, it will not be changed back by the source AP, so that after the AP is switched, the downlink message can be forwarded to the destination AP.

608. The UE performs air interface synchronization with the target AP, and establishes an air interface link.

609. After the air interface is synchronized, the destination AP sends a handover detection message to the AG.

610. The UE sends a radio bearer reconfiguration complete message to the target AP.

611. After receiving the radio bearer reconfiguration complete message, the destination AP starts to send and receive data, and sends a handover completion message to the AG, and the AG starts to send data to the destination AP.

612. After the destination AP sends the handover complete message, it judges whether the address and subnet mask of the source AP are in the same subnet as the destination AP; when the source AP and the destination AP belong to the same subnet, the destination AP sends a message carrying Have the DHCP request message of the UE's source MAC to the Dynamic Host Configuration Protocol server (DHCP SERVER); This DHCP request message is used to refresh the MAC forwarding table and the ARP table of the two-layer device; Forwarding table and ARP table, downlink packets can be forwarded to the destination AP. When the subnets are different, no processing is performed. Wherein, the MAC forwarding table is a port-based Layer 2 forwarding table. The Ethernet switch obtains the forwarding port number of the Layer 2 message by searching the MAC forwarding table, so as to realize the fast forwarding of the Layer 2 message. The entries in the MAC forwarding table mainly include: the destination MAC address, the VLAN ID to which the port belongs, and the forwarding port number. The ARP table records the correspondence between the MAC address and the IP address of the host. The specific method of refreshing the MAC address table and ARP table of the device in the LAN connected to the destination AP is as follows:

Method 1: Use the source MAC of the UE to encapsulate the DHCP request message and send it to the DHCP server. The destination MAC of the message is the broadcast MAC. After the device in the LAN receives the DHCP request message, it refreshes the MAC forwarding table and ARP table of the device in the LAN connected to the AP.

Method 2: Using the gratuitous ARP mechanism, the destination AP sends gratuitous ARP packets to the connected LAN to refresh the MAC forwarding table and ARP table of the devices in the LAN. A gratuitous ARP message is a special ARP message. The sender IP address and destination IP address carried in the message are both the local IP address, the sender MAC address is the local MAC address, and the destination MAC address is the broadcast address. . By sending gratuitous ARP packets externally, the following functions can be realized: when a device changes its hardware address, it can notify other devices to update ARP entries and MAC forwarding tables by sending gratuitous ARP packets. For the received gratuitous ARP message, if there is no ARP entry corresponding to the message in the ARP table, the information carried in the gratuitous ARP message is added to its own ARP mapping table, and the MAC forwarding table is updated.

Method 3: Send a broadcast ARP request message. When the LAN device receives the ARP packet, it updates its own ARP table and MAC forwarding table.

613. For PS domain data traffic accessing the core network, the UE sends and receives data traffic through the AG and the destination AP instead of passing through the source AP.

614. For bypass data, the UE transmits and receives data through the destination AP instead of the source AP.

615. The AG sends a message carrying a resource release command to the source AP, notifying the source AP to release the corresponding resource.

616. The source AP releases corresponding resources of the UE.

617. The source AP sends a release completion message to the AG to complete the access point switching process.

According to an access point switching method provided in an embodiment of the present invention, a switching request message carrying the PDP address of the UE to be switched, the address of the source AP, and the subnet mask is received by the destination access point; The address and subnet mask determine whether the source AP and the destination AP belong to the same subnet, so as to perform access point switching, so that after the user equipment switches to the local access point area, the destination AP according to the packet data protocol of the user equipment The address sends bypass data directly to the user equipment. Compared with the prior art, the embodiment of the present invention uses access point handover, so that after the user equipment is handed over to the target access point, the target access point can directly report to the user equipment according to the address of the user equipment. Sending the bypass data ensures the continuity of the bypass service data of the user equipment during the switching process of the user equipment among multiple access points.

As shown in FIG. 7, it is an access point switching method provided by the embodiment of the present invention, and its specific implementation process is as follows:

701. When the source access point AP finds that the user equipment in the local access point area needs to switch the access point, the source AP sends a switch message carrying the PDP address of the UE to be switched and the address of the source AP to the AG to request a switch.

702. After receiving the access point switching message, the AG sends a switching request message carrying the PDP address of the UE to be switched and the address of the source AP to the target AP according to the cell ID of the target AP, and requests the target AP to allocate a relevant access point for the UE. resource. Wherein, the user equipment is identified according to the PDP address of the UE to be handed over carried in the handover request message; the address of the source AP is used to establish a bypass data channel with the target AP.

703. After receiving the handover request message, the target AP allocates relevant resources for the UE and establishes a wireless link.

704. The destination AP returns a handover request response message to the AG.

705. According to the IP address of the source AP obtained in step 702, the destination AP sends a mobile IP registration request message to the source AP; wherein, the mobile IP registration request message includes the IP address of the destination AP and the pending Switch the PDP address of the UE. For example: use the home address field in the mobile IP registration request message to carry the PDP address of the UE to be handed over, and use the care-of address field to carry the IP address of the destination AP.

706. After receiving the mobile IP registration request message, the source AP saves the IP address of the destination AP and the PDP address of the UE to be handed over, and then sends a mobile IP registration response message to the destination AP.

707. After receiving the handover request response message, the AG sends a message carrying the handover command to the source AP.

708. After receiving the message carrying the switching command, the source AP stops sending downlink data, and sends a radio bearer reconfiguration message to the UE.

709. The source AP establishes a bypass data channel with the destination AP according to the IP address reported by the destination AP. The described setting up bypass data channel can adopt GPRS tunnel agreement to realize, also can realize by the tunnel of mobile IP, also can realize by the Iur interface between source AP and purpose AP, can also be realized by source AP and purpose AP The air interface between establishes the wireless link; Wherein, described control establishment wireless link can be accomplished by wireless fidelity (Wireless Fidelity, Wi-Fi) technology, namely source AP and target AP all integrate Wi-Fi function , so that bypass data communication can be performed between the source AP and the destination AP through the Wi-Fi wireless link. The specific implementation of the establishment of the bypass data channel can be as follows:

Method 1: use an IPSec tunnel to establish an IPSec tunnel between the source AP and the destination AP.

Method 2: GPRS tunneling protocol can be used to realize, for example: in WCDMA system, GPRS tunneling protocol is applied between SGSN and GGSN, between SGSN and RNC, to establish a channel for data packet transmission, because AP integrates RNC function, itself The GPRS tunnel protocol is supported, so the existing supported GPRS tunnel protocol can be used to establish a bypass traffic channel between the source AP and the destination.

Mode 3: It can be realized by using a mobile IP tunnel, for example: IPinIP (IP encapsulation in IP), put an IP packet in the payload of a new IP packet; the minimum encapsulation in IP is a simplified implementation of IPinIP, The redundant part of the inner IP header and the outer IP header in IPinIP is removed; GRE (Generic Routing Encapsulation, General Routing Encapsulation Protocol) is to encapsulate the 3-layer message into the IP message, and then untie it after sending it to the peer end of the tunnel. technology; UDP tunnel encapsulation encapsulates IP packets in UDP packets for transmission. In this way, the above technology can be borrowed between the source AP and the destination AP to establish a bypass traffic tunnel.

Method 4: Realize through the Iur interface between the source AP and the destination AP: the Iur interface is an interface between RNCs, and the AP integrates the RNC function, so the Iur interface can be used between APs for communication.

Method 5: Establish a wireless link through the air interface between the source AP and the destination AP. For example, both the source AP and the destination AP integrate Wi-Fi functions, and then use Wi-Fi to communicate between them.

710. The UE performs air interface synchronization with the target AP, and establishes an air interface link.

711. After the air interface is synchronized, the destination AP sends a handover detection message to the AG.

712. The UE sends a radio bearer reconfiguration complete message to the target AP.

713. After receiving the radio bearer reconfiguration complete message, the target AP starts to send and receive data, and sends a handover complete message to the AG, and the AG starts to send data to the target AP.

714. For PS domain data traffic accessing the core network, the UE sends and receives data through the destination AP instead of the source AP.

715. For the bypass data in the downlink direction, the bypass data from the network side first arrives at the source AP, and then is forwarded by the source AP to the destination AP, and then forwarded by the destination AP to the UE.

716. For the bypass data in the uplink direction, the uplink message from the UE reaches the destination AP first, and after the destination AP distinguishes the bypass data, there are two processing methods: first, forward the bypass data to the source AP, and then The source AP forwards the bypass data to the network side; the second method directly forwards the bypass data to the network side without passing through the source AP.

717. The AG sends a message carrying a resource release command to the source AP, notifying the source AP to release corresponding resources.

718. The source AP releases corresponding resources of the UE.

719. The source AP sends a release complete message to the AG to complete the handover process.

As shown in FIG. 8, it is an access point switching method provided by the embodiment of the present invention, and its specific implementation process is as follows:

801-804 are the same as the above-mentioned steps 801-804, and will not be repeated here.

805: The AG sends a message carrying a switching command; wherein, the switching command message also carries the IP address of the target AP and the PDP address of the UE to be switched.

Steps 806-817 are the same as steps 708-719 above, and will not be repeated here.

It is worth noting that the access point switching methods described above in Figure 7 and Figure 8 are not only applicable to the scenario where the destination access point and the source access point belong to the same subnet, but also applicable to the scenario where the destination access point and the source access point belong to the same subnet. Scenarios belonging to different subnets.

According to an access point switching method provided by an embodiment of the present invention, a switching request message carrying the PDP address of the UE to be switched and the address of the source AP is received through the target access point; The source AP establishes a bypass data channel, so that after the user equipment switches to the local access point area, the target AP sends bypass data to the user equipment through the established bypass data channel. Compared with the prior art, the embodiment of the present invention uses access point switching so that after the user equipment switches to the target access point, the target AP sends a bypass message to the user equipment through the established bypass data channel. The channel data ensures the continuity of the user equipment bypass service data during the process of switching the user equipment between multiple access points.

Through the description of the above embodiments, those of ordinary skill in the art can understand that all or part of the steps in the method of the above embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable When the program is executed, the program includes the steps of the above-mentioned method embodiment, the storage medium described, such as: ROM/RAM, magnetic disk, optical disk, etc.

The above is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Anyone skilled in the art can easily think of changes or substitutions within the technical scope disclosed in the present invention. Should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1, a kind of access point switching method is characterized in that, comprising:

When the subscriber equipment in this access point of access point discovery zone, source need switch access point,

The switching message of the packet data protocol address of described subscriber equipment is carried in transmission, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.

2, access point switching method according to claim 1, it is characterized in that, described switching message is also carried the address and the subnet mask of active access point, so that the purpose access point judges according to the address and the subnet mask of described source access point whether described source access point and purpose access point are same subnet;

When described source access point and purpose access point were same subnet, described method also comprised:

Reception carries the message of switching command, according to the described switching command that receives, stops to send the arp request message that DHCP is re-rented message and stopped to respond described subscriber equipment;

Perhaps, receive the switching command of IAD transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol address and the purpose access point of described subscriber equipment in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point;

When described source access point and purpose access point are different sub-network, described method also comprises: receive the switching command of IAD transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol address and the purpose access point of described subscriber equipment in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point.

3, access point switching method according to claim 1 is characterized in that, when described switching message was also carried active access point address, described method also comprised:

Receive the switching command that IAD sends according to access point address, described source, or, the register request message of the packet data protocol address that carries described subscriber equipment that described purpose access point sends according to access point address, described source and the address of purpose access point;

Set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of described purpose access point.

4, a kind of access point switching method is characterized in that, comprising:

Reception carries the handoff request message of the packet data protocol address of described subscriber equipment;

After subscriber equipment switches to this access point zone, send bypass data to described subscriber equipment according to the packet data protocol address of described subscriber equipment.

5, access point switching method according to claim 4, it is characterized in that, when described handoff request message is also carried the address of active access point and subnet mask, judge according to the address and the subnet mask of described source access point whether described source access point and this access point are same subnet;

When being same subnet, after described subscriber equipment is finished switching, refresh medium Access Layer address table and address analysis protocol table, so that the medium Access Layer address table of network side entity after according to described refreshing sends to this access point with the bypass data of described subscriber equipment, perhaps, send the register request message of the address information of the packet data protocol address carry described subscriber equipment and this access point to described source access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point;

When being different sub-network, send the register request message of the address information of the packet data protocol address that carries described subscriber equipment and this access point according to the address of described source access point to described source access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point.

6, access point switching method according to claim 4 is characterized in that, when described switching message is also carried active access point address, comprising:

Send the register request message of the address information of the packet data protocol address that carries described subscriber equipment and this access point according to the address of described source access point to described source access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point.

7, a kind of access point switching device shifter is characterized in that, comprising:

Detecting unit, whether the subscriber equipment that is used to detect in this access point zone needs to switch access point;

Message sending unit, be used to send the switching message of the packet data protocol address that carries described subscriber equipment, so that after described subscriber equipment switches to the purpose access point, described purpose access point sends bypass data according to the address of described subscriber equipment to described subscriber equipment.

8, access point switching device shifter according to claim 7 is characterized in that, described device also comprises:

First message processing unit is used to receive the message that carries switching command, according to the described switching command that receives, stops to send the arp request message that DHCP is re-rented message and stopped to respond described subscriber equipment; And/or,

Second message processing unit, be used to receive the switching command of IAD transmission or the register request message that described purpose access point sends, carry the address of the packet data protocol address and the purpose access point of described subscriber equipment in described switching command or the register request message, set up the bypass data passage according to the packet data protocol address of described subscriber equipment and the address and the described purpose access point of purpose access point.

9, a kind of access point switching device shifter is characterized in that, comprising:

The message sink unit is used to receive the handoff request message of the packet data protocol address that carries described subscriber equipment;

Data transmission unit is used for after subscriber equipment switches to this access point zone, sends bypass data according to the packet data protocol address of described subscriber equipment to described subscriber equipment.

10, access point switching device shifter according to claim 9 is characterized in that, this device also comprises:

Judging unit is used for judging according to the address and the subnet mask of described source access point whether described source access point and this access point are same subnet when described handoff request message is also carried the address of active access point and subnet mask;

Refresh unit, be used for when described judgment unit judges is same subnet, after described subscriber equipment is finished switching, refresh medium Access Layer address table and address analysis protocol table, so that the medium Access Layer address table of network side entity after according to described refreshing sends to this access point with the bypass data of described subscriber equipment; And/or,

Message sending unit, be used for sending the register request message of the address information of the packet data protocol address carry described subscriber equipment and this access point, so that described source access point is set up the bypass data passage according to the packet data protocol address of described subscriber equipment and address information and this access point of this access point to described source access point.

Images