WO2015100610A1

WO2015100610A1 - Method and device for keeping ip address of user equipment fixed

Info

Publication number: WO2015100610A1
Application number: PCT/CN2013/091086
Authority: WO
Inventors: 刘绍峰
Original assignee: 华为技术有限公司
Priority date: 2013-12-31
Filing date: 2013-12-31
Publication date: 2015-07-09
Also published as: CN104412548A; CN104412548B

Abstract

Embodiments of the present invention provide a method and a device for keeping an IP address of a user equipment fixed. The method comprises: when a PGW detects that a UE establishes a PDN connection on the PGW, the PGW broadcasting new routing information reaching the UE to all routers in a region corresponding to an SGi interface; each of the routers performing route learning according to the new routing information, and obtaining a dynamic route reaching the UE, a destination address of the dynamic route being a static IP address of the UE; and when the router receives a downlink data packet of the UE, the router forwarding the downlink data packet to the PGW according to the dynamic route. By using the method, an IP address of a UE can be kept unchanged, and a route does not need to be manually configured and a router dynamically learns the route; and especially, in a scenario of networking of multiple PGWs, the complexity of route configuration is reduced, and the problem of resource waste caused by using an alternative route is alleviated.

Description

Method and device for keeping user equipment IP address fixed

Technical field

The embodiments of the present invention relate to communication technologies, and in particular, to a method and a device for maintaining a fixed IP address of a user equipment. Background technique

With the rapid development of Long Term Evolution (LTE) technology, wireless bandwidth capabilities are increasing, and more and more users choose LTE as the wireless broadband access method. After accessing the network, the User Equipment (UE) usually requires the use of fixed Internet Protocol (IP) address communication. However, if the UE is in different evolved packet core networks ( When Evolved Packet Core (EPC) is switched, the UE is usually required to use different IP addresses under different EPC PGWs. If the UE uses the same IP address under different EPC Packet Data Network Gateways (PGWs) Then, when the router forwards the downlink packet, the router cannot determine which PGW to forward the packet to according to the IP address of the UE.

In the prior art, in order to keep the IP address of the UE fixed in different PGWs, a static IP address is configured for the UE. The following two PGWs are used as an example. As shown in FIG. 1 , FIG. 1 is a prior art packet forwarding. As shown in the figure, PGW1 and PGW2 are connected to the same router. The router has the primary and backup routes to the static IP address of the UE. The next hop of the primary route is PGW1, and the next hop of the standby route is PGW2. At the same time, the first loop to the UE is configured on the PGW1, and the next hop from the first loop is a router, and the second loop of the UE is configured on the router, and the next hop of the second loop is PGW2. When the PGW1 and the PGW2 are working normally, after the downlink packet arrives at the router, the router forwards the packet to the PGW1 according to the primary route. After receiving the packet, the PGW1 determines whether the UE establishes a PDN connection locally. If the UE establishes a PDN connection locally, Then, PGW1 performs local processing on the packet and does not forward the packet. If PGW1 determines that the UE does not establish a PDN connection locally, the packet is forwarded to the router, and the router searches for the second loop, and learns that the next hop of the second loop is PGW2. Then, the packet is forwarded to the PGW2, and the PGW2 determines that the UE establishes a PDN connection locally, and then the packet is sent. For the processing, it should be noted that, in the above example, the second loop may be set on other routers, and may not necessarily be returned to the same router. The above example has only two PGW cases. When there are multiple PGWs, multiple loops need to be configured.

In the prior art solution, the loop is required to be configured in the EPC, and the bandwidth needs to be reserved for the report. In the case of multiple EPC networks, the loop is required to be configured on multiple EPCs. , and the configuration is more complicated, and the maintainability is poor. Summary of the invention

The embodiments of the present invention provide a method and a device for maintaining a fixed IP address of a user equipment, which reduces the complexity of the routing configuration and reduces the waste of resources caused by the loop.

A first aspect of the present invention provides a method for maintaining a fixed IP address of a user equipment, including: when a user equipment UE establishes a PDN connection of a packet data network on a packet data gateway PGW, the router receives a destination that the PGW broadcasts on the SGi interface. The newly added routing information of the UE, where the newly added routing information includes a static internet protocol IP address and a subnet mask of the UE; the router performs routing learning according to the newly added routing information, and obtains the arrival of the UE. Dynamic routing, the dynamic routing includes: a destination address, the subnet mask, and a next hop address, where the destination address is a static IP address of the UE;

The router receives the downlink data packet sent by the network side to the UE, and sends the downlink data packet to the PGW according to the destination IP address of the downlink data packet and the dynamic route.

In a first possible implementation manner of the first aspect of the present invention, the method further includes:

When the UE deletes the PDN connection on the PGW, the router receives the

a route deletion message sent by the PGW, where the route deletion message includes a static IP address and a subnet mask of the UE;

The router deletes the dynamic route according to the route deletion message.

In a second possible implementation manner of the first aspect of the present invention, the method further includes:

The router detects a status of the PGW, and determines, according to a status of the PGW, whether the PGW is faulty;

When the router determines that the PGW is faulty, the router deletes all the routing entries of the PGW that are saved locally, and the routing entry includes the dynamic routing. A second aspect of the present invention provides a method for maintaining a fixed IP address of a user equipment, including: the packet data gateway PGW determines that the user equipment UE establishes a packet data network PDN connection on the PGW;

The PGW broadcasts new routing information to the UE in the area corresponding to the SGi interface through the SGi interface, where the newly added routing information includes the static Internet Protocol IP address and the subnet of the UE. The mask is configured to perform routing learning according to the newly added routing information by all routers in the area corresponding to the SGi interface.

In a first possible implementation manner of the second aspect of the present invention, when the SGi interface adopts an open shortest path first OSPF protocol, the PGW broadcasts to all routers in the area corresponding to the SGi interface through the SGi interface. And sending the newly added routing information to the UE, where the PGW includes the new routing information in the link state broadcast data packet LSA, and all the areas in the area corresponding to the SGi interface through the SGi interface The router broadcasts the LSA.

In a second possible implementation manner of the second aspect of the present invention, when the SGi interface adopts a routing information protocol (RIP), the PGW broadcasts a destination to all routers in the area corresponding to the SGi interface through the SGi interface. The newly added routing information of the UE includes:

The PGW includes the newly added routing information in the response data packet, and periodically sends the response data packet to all routers in the area corresponding to the SGi interface by using the SGi interface.

With reference to the second aspect of the present invention and the first and second possible implementation manners of the second aspect, in a third possible implementation manner of the second aspect of the present invention, the method further includes:

When the UE deletes the PDN connection on the PGW, the PGW sends a route deletion message to all routers in the area corresponding to the SGi interface, so that all routers in the area corresponding to the SGi interface are based on The route deletion message deletes the dynamic route, and the route deletion message includes a static IP address and a subnet mask of the UE.

A third aspect of the present invention provides a router, including:

a receiving module, configured to receive, when the user equipment UE establishes a packet data network PDN connection on the packet data gateway PGW, the newly added routing information that is sent by the PGW to the SGi interface and is sent to the UE, where the new route is The information includes a static internet protocol IP address and a subnet mask of the UE;

a route learning module, configured to perform, according to the newly added routing information received by the receiving module Learning, obtaining a dynamic route to the UE, the dynamic route includes: a destination address, the subnet mask, and a next hop address, where the destination address is a static IP address of the UE; The receiving module is further configured to receive a downlink data packet sent by the network side to the UE, where the sending module is configured to: when the receiving module receives the downlink data packet sent by the network side to the UE, according to the downlink data The destination IP address of the packet and the dynamic route send the downlink data packet to the PGW.

In a first possible implementation manner of the third aspect, the router further includes: a route deletion module;

The receiving module is further configured to: when the UE deletes the PDN connection on the PGW, receive a route deletion message sent by the PGW, where the route deletion message includes a static IP address and a subnet of the UE Mask

The route deletion module is configured to delete the dynamic route according to the route deletion message received by the receiving module.

In a second possible implementation manner of the third aspect of the present invention, the router further includes: a fault detection module, configured to detect a status of the PGW, and determine, according to a status of the PGW, whether the PGW is faulty;

The route deletion module is further configured to: when the fault detection module determines that the PGW is faulty, delete all the routing entries of the locally saved PGW, where the routing entry includes the dynamic routing.

A fourth aspect of the present invention provides a packet data gateway PGW, including:

a determining module, configured to determine that the user equipment UE establishes a packet data network PDN connection on the PGW;

a sending module, configured to broadcast, by using an SGi interface, all the routers in the area corresponding to the SGi interface to send new routing information to the UE, where the newly added routing information includes a static Internet Protocol IP address of the UE And a subnet mask, so that all routers in the area corresponding to the SGi interface perform route learning according to the newly added routing information.

In a first possible implementation manner of the fourth aspect of the present invention, when the SGi interface adopts an open shortest path first OSPF protocol, the sending module is specifically configured to:

The new routing information is included in the link state broadcast data packet LSA, and the LSA is broadcasted to all routers in the area corresponding to the SGi interface by using the SGi interface. In a second possible implementation manner of the fourth aspect of the present invention, when the SGi interface adopts a routing information protocol (RIP), the sending module is specifically configured to:

And the new routing information is included in the response data packet, and the response data packet is periodically sent to all routers in the area corresponding to the SGi interface by using the SGi interface.

With the fourth aspect of the present invention and the first and second possible implementation manners of the fourth aspect, in a third possible implementation manner of the fourth aspect of the present invention, the sending module is further configured to:

When the UE deletes the PDN connection on the PGW, sending a route deletion message to all routers in the area corresponding to the SGi interface, so that all routers in the area corresponding to the SGi interface are according to the route. The deletion message deletes the dynamic route, and the route deletion message includes a static IP address and a subnet mask of the UE.

The method and the device for maintaining the IP address of the user equipment are fixed. When the PGW detects that the UE establishes a PDN connection on the PGW, the PGW broadcasts the newly added routing information of the UE to all the areas in the area corresponding to the SGi interface. a router, so that each router performs routing learning according to the newly added routing information, and obtains a dynamic route to the UE, where the destination address of the dynamic route is a static IP address of the UE, and therefore, when the router receives the downlink addressed to the UE, The data packet is forwarded to the PGW according to the dynamic route. The foregoing method can keep the IP address of the UE unchanged, and does not need to manually configure the route, and the router learns the route dynamically, especially in the scenario of multiple PGW networks, and does not need to configure multiple loops for the UE, and does not need to be configured. The bandwidth is reserved for the return text, thereby reducing the complexity of the routing configuration and reducing the waste of resources caused by the loop. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. The drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive labor.

FIG. 1 is a schematic diagram of packet forwarding in the prior art;

2 is a flowchart of Embodiment 1 of a method for maintaining a fixed IP address of a user equipment according to the present invention; FIG. 3 is a flowchart of Embodiment 2 of a method for maintaining a fixed IP address of a user equipment according to the present invention; 4 is a flowchart of Embodiment 3 of a method for maintaining a fixed IP address of a user equipment according to the present invention; FIG. 5 is a flowchart of Embodiment 4 of a method for maintaining a fixed IP address of a user equipment according to the present invention; A schematic diagram of the structure of a router;

FIG. 7 is a schematic structural diagram of another router according to Embodiment 6 of the present invention;

8 is a schematic structural diagram of a PGW according to Embodiment 7 of the present invention;

9 is a schematic structural diagram of another router according to Embodiment 8 of the present invention;

FIG. 10 is a schematic structural diagram of another PGW according to Embodiment 9 of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

2 is a flowchart of Embodiment 1 of a method for maintaining a fixed IP address of a user equipment according to the present invention, as shown in FIG.

As shown in FIG. 2, the method provided in this embodiment includes the following steps:

Step 101: When the UE establishes a PDN connection on the PGW, the router receives the newly added routing information that the PGW broadcasts on the SGi interface and arrives at the UE, where the newly added routing information includes the static IP address and the subnet mask of the UE.

When the UE establishes a Packet Data Network (PDN) connection on the PGW, the PGW broadcasts and sends new routing information to the UE in the area corresponding to the SGi interface through the SGi interface, for the SGi. All the routers in the area corresponding to the interface perform route learning according to the newly added routing information, where the newly added routing information includes the static IP address and the subnet mask of the UE, and each router can learn one arrival according to the newly added routing information. The dynamic routing of the UE, the static IP address of the UE is the destination address of the dynamic routing.

Step 102: The router performs routing learning according to the newly added routing information, and obtains a dynamic route to the UE. The dynamic route includes: a destination address, the subnet mask, and a next hop address, where the destination address is a static IP of the UE. address.

After receiving the new routing information sent by the PGW broadcast, the router uses the routing algorithm to learn the routing according to the newly added routing information. When the router uses different routing protocols, the routing algorithm There are also differences. For example, when the router uses the Open Shortest Path First (OSPF) protocol, the OSPF protocol uses the Dijkstra routing algorithm for routing learning. Route learning is a prior art, so there is no description here. .

The router obtains the dynamic route to the UE through the route learning. The dynamic route includes: a destination address, a subnet mask, and a next hop address, where the dynamic route is a shortest path to the UE, and the destination address of the dynamic route is The static IP address of the UE, after receiving the downlink data packet whose destination address is the static IP address of the UE, the router sends the downlink data packet to the PGW according to the dynamic route, and the PGW sends the downlink data packet to the PGW through the LTE network. UE.

Step 103: The router receives the downlink data packet sent by the network side to the UE, and sends the downlink data packet to the PGW according to the destination IP address of the downlink data packet and the dynamic route.

First, a brief introduction to the forwarding mechanism of the router. When the data packet is forwarded to the router, the router first takes the destination address of the data packet from the header. If the destination network segment to which the destination address belongs is in the router, the router directly sends the data packet. Go to the port corresponding to the destination network segment; if the destination address of the data packet is not in the router, calculate the best path to the destination address according to the path table, and forward the data packet to the shortest path. The next hop routing device.

In this embodiment, after the router learns the dynamic route to the UE, when the router receives the downlink data packet addressed to the UE, and determines that the destination address of the downlink data packet is the static IP address of the UE, the router The routing information table is searched according to the destination address of the downlink data packet, and the routing information table maintains multiple routing entries. The router finds the dynamic routing by searching the routing information table, and learns the next downlink data packet according to the dynamic routing. The hop network element is the PGW, and the router forwards the downlink data packet according to the next hop address of the dynamic route, and finally forwards the downlink data packet to the PGW, and the PGW receives the downlink data sent by the router. After the message, the downlink data packet is sent to the UE via the LTE network.

The method provided in this embodiment, when the PGW detects that the UE establishes a PDN connection on the PGW,

The PGW broadcasts the new routing information of the UE to all the routers in the area corresponding to the SGi interface, so that each router performs routing learning according to the newly added routing information, and obtains a dynamic route to the UE, and the destination address of the dynamic routing. It is the static IP address of the UE. Therefore, when the router receives the downlink data packet addressed to the UE, the router forwards the downlink data packet to the PGW according to the dynamic route. The above method can keep the IP address of the UE unchanged, and does not need to manually configure the way. The router dynamically learns the route, especially in the scenario of multiple PGW networks. It does not need to configure multiple loops for the UE, and does not need to reserve bandwidth for the report, thus reducing the complexity of the route configuration. , and the problem of wasted resources caused by the use of loops.

FIG. 3 is a flowchart of Embodiment 2 of a method for maintaining a fixed IP address of a user equipment according to the present invention. As shown in FIG. 3, the method provided in this embodiment includes the following steps:

Step 201: The PGW determines that the UE establishes a PDN connection on the PGW.

Step 202: The PGW broadcasts and sends new routing information to the UE in the area corresponding to the SGi interface through the SGi interface, where the newly added routing information includes a static IP address and a subnet mask of the UE. All routers in the area corresponding to the SGi interface perform route learning according to the newly added routing information.

When the SGi interface uses different routing protocols, the way in which the PGW broadcasts new routing information will vary depending on the protocol. If the SGi interface adopts the OSPF protocol, the PGW broadcasts the new routing information to the UE in the area corresponding to the SGi interface through the SGi interface, specifically: The PGW includes the newly added routing information in the link state broadcast. In the data packet LSA, the LSA is broadcasted to all routers in the area corresponding to the SGi interface through the SGi interface. If the SGi interface uses the routing information protocol RIP, the PGW broadcasts the new routing information to the UE in the area corresponding to the SGi interface through the SGi interface, specifically: the PGW includes the new routing information in the response. In the data packet, the response packet is periodically sent to all routers in the area corresponding to the SGi interface through the SGi interface.

Taking OSPF as an example, the PGW sends all routers in the area corresponding to the SGi interface.

The LSA includes the newly added routing information. After receiving the LSA, the router learns the route according to the newly added routing information, and obtains a dynamic route to the UE. The dynamic route is the shortest path to the UE. The dynamic route includes: a destination address, a subnet mask, and a next hop address, where the destination address is a static IP address of the UE, and then, when the router receives the downlink data packet of the UE, the UE is configured according to the dynamic route. The downlink data packet is sent to the PGW, and the PGW sends the downlink data packet to the UE through the LTE network.

In the method provided by the embodiment, when the UE establishes a PDN connection on the PGW, the PGW broadcasts the newly added routing information of the UE to all the routers in the area corresponding to the SGi interface, so that each router performs the routing information according to the newly added routing information. Route learning, calculating the shortest path to the UE, the destination address of the shortest path is the static IP address of the UE, and therefore, when the router receives the destination When the downlink data packet of the UE is received, the downlink data packet is forwarded to the PGW according to the shortest path. The foregoing method can keep the IP address of the UE unchanged, and does not need to manually configure the route, and the router learns the route dynamically, especially in the scenario of multiple PGW networks, and does not need to configure multiple loops for the UE, and does not need to be configured. The bandwidth is reserved for the return text, thereby reducing the complexity of the routing configuration and reducing the waste of resources caused by the loop.

4 is a flowchart of Embodiment 3 of a method for maintaining a fixed IP address of a user equipment according to the present invention. As shown in FIG. 4, the method provided in this embodiment includes the following steps:

Step 301: When the UE establishes a PDN connection on the PGW, the PGW broadcasts and sends new routing information to the UE in the area corresponding to the SGi interface through the SGi interface, where the newly added routing information includes the UE. Static IP address and subnet mask.

Step 302: The router receives the newly added routing information sent by the PGW.

Step 303: The router performs route learning according to the newly added routing information, and obtains a dynamic route to the UE.

The router learns and calculates a dynamic route to the UE, and the dynamic route is the shortest path to the UE. The dynamic route includes: a destination address, a subnet mask, and a next hop, where the dynamic route is The destination address is the static IP address of the UE.

Step 304: The router receives the downlink data packet sent by the network side to the UE, and sends the downlink data packet to the PGW according to the destination IP address of the downlink data packet and the dynamic route.

Step 305: When the UE deletes the PDN connection on the PGW, the PGW broadcasts a route deletion message to all routers in the area corresponding to the SGi interface through the SGi interface, where the route deletion message includes the static IP address and the subnet mask of the UE.

When the UE deletes the PDN connection on the PGW, the PGW deletes the message by issuing the route of the UE, so that each router deletes the message according to the route, and deletes all the routing entries that are saved to the UE.

306. The router receives the route deletion message sent by the PGW, and deletes the dynamic route according to the route deletion message.

After receiving the route deletion message sent by the PGW, the router deletes the message according to the route and learns the route, and deletes the dynamic route.

In a practical application, the PGW may be faulty. The fourth embodiment of the present invention will be described in detail as an example of how to select a new route for the UE when the PGW is faulty. FIG. 5 is a diagram of maintaining user equipment IP according to the present invention The flowchart of the fourth embodiment of the method is fixed. In this embodiment, two PGWs are used as an example, and the PGW adopts an OSPF protocol. If the PGW1 is faulty, the UE re-establishes a PDN connection on the PGW2. As shown in FIG. The methods provided include the following steps:

Step 401: The PGW1 sends a hello packet to the router according to the preset time interval, so that the router detects the state of the PGW1 according to the hello packet.

Step 402: The router detects the state of the PGW1 according to the hello packet.

Specifically, if the router fails to continuously receive the specified number of hello messages sent by the PGW1 within the preset time interval, it determines that the PGW1 is faulty.

Step 403: When the router determines that the PGW1 is faulty, the router deletes all routes of the locally saved PGW1.

After the PGW1 is faulty, the UE reselects the PGW2 attachment to establish a PDN connection, and the PGW2 sends the link state information to the router to send the routing information to the router, where the routing information includes the static IP address and the subnet mask of the UE. In order to enable the router to learn the route to the UE according to the routing information of the PGW2, the router learns that the next hop address of the route to the UE is the IP address of the PGW2, and the router receives the downlink data packet of the UE. Sending the downlink data packet of the UE to PGW2 according to the route of the UE.

In this embodiment, after the fault is recovered, the PGW1 re-establishes a neighbor relationship with the router, and the PGW1 notifies the router of all local-to-UE routing information, and the router learns the routing information of all UEs on the PGW1, and calculates each UE. The next hop address of the route. When OSPF is used, PGW1 broadcasts all local-to-UE routing information through the LSA. When RIP is used, PGW1 periodically floods the response packets to notify neighbors of all routing information.

It should be noted that, in the fourth embodiment, the network system adopts the OSPF protocol as an example. The PGW maintains the neighbor relationship through the hello packet, and the router detects whether the neighboring PGW is faulty through the hello packet. When the network system adopts the RIP protocol, the PGW maintains the neighbor status by responding to the message. The PGW floods and broadcasts a response message every 30 seconds. The response message contains all the routing information of the PGW. If the router does not have 180 seconds. When the response packet is received, the router considers that the neighbor is faulty.

FIG. 6 is a schematic structural diagram of a router according to Embodiment 5 of the present invention. As shown in FIG. 6, the router provided in this embodiment includes: a receiving module 51, a routing learning module 52, and a sending module 53.

The receiving module 51 is configured to establish, when the user equipment UE is on the packet data gateway PGW, Receiving, when the packet data network PDN is connected, receiving the newly added routing information that is sent by the PGW to the UE and being sent by the SGi interface, where the newly added routing information includes a static Internet Protocol IP address and a subnet mask of the UE;

The routing learning module 52 is configured to perform routing learning according to the newly added routing information received by the receiving module 51, and obtain a dynamic route to the UE, where the dynamic routing includes: a destination address, the subnet mask, and a next hop address, where the destination address is a static IP address of the UE;

The receiving module 51 is further configured to receive a downlink data packet sent by the network side to the UE, where the sending module 53 is configured to: when the receiving module 51 receives the downlink data packet sent by the network side to the UE, Sending the downlink data packet to the PGW according to the destination IP address of the downlink data packet and the dynamic route.

The router provided in this embodiment can be used to implement the technical solution in the first embodiment of the method. The specific implementation manner and technical effects are similar, and details are not described herein again.

FIG. 7 is a schematic structural diagram of another router according to Embodiment 6 of the present invention. As shown in FIG. 7, the router provided in this embodiment includes: a receiving module 61, a route learning module 62, and a sending module 63.

The receiving module 61 is configured to: when the user equipment UE establishes a packet data network PDN connection on the packet data gateway PGW, receive new routing information that is sent by the PGW to the SGi interface and is sent to the UE, where the adding The routing information includes a static internet protocol IP address and a subnet mask of the UE;

The routing learning module 62 is configured to perform routing learning according to the newly added routing information received by the receiving module 61, and obtain a dynamic route to the UE, where the dynamic routing includes: a destination address, the subnet mask, and a next hop address, where the destination address is a static IP address of the UE;

The receiving module 61 is further configured to receive a downlink data packet sent by the network side to the UE, where the sending module 63 is configured to: when the receiving module 61 receives the downlink data packet sent by the network side to the UE, Sending the downlink data packet to the PGW according to the destination IP address of the downlink data packet and the dynamic route.

The router of the present implementation may further include a route deletion module 64, where the receiving module 61 is further configured to: when the UE deletes the PDN connection on the PGW, receive a route deletion message sent by the PGW, and the route The deletion message includes a static IP address and a subnet mask of the UE; The route deletion module 64 is configured to delete the dynamic route according to the route deletion message received by the receiving module 61.

Further, the router of the present implementation further includes: a fault detection module 65, configured to detect a state of the PGW, and determine whether the PGW is faulty according to a state of the PGW; the route deletion module 64 is further used to When the fault detection module 65 determines that the PGW is faulty, all the routing entries in the routing information table of the PGW that are saved locally are deleted, and the routing entry includes the dynamic routing.

The router provided in this embodiment may be used to implement the technical solutions in the first embodiment, the third embodiment, and the fourth embodiment. The specific implementation manners and technical effects are similar, and details are not described herein again.

FIG. 8 is a schematic structural diagram of a PGW according to Embodiment 7 of the present invention. As shown in FIG. 8, the PGW provided in this embodiment includes: a determining module 71 and a sending module 72.

The determining module 71 is configured to determine that the user equipment UE establishes a packet data network PDN connection on the PGW.

The sending module 72 is configured to broadcast, by using the SGi interface, the newly added routing information that is sent to the UE to all the routers in the area corresponding to the SGi interface, where the newly added routing information includes the static internet protocol IP of the UE. The address and the subnet mask are used by all the routers in the area corresponding to the SGi interface to perform route learning according to the newly added routing information.

When the SGi interface adopts the open shortest path first OSPF protocol, the sending module 72 is specifically configured to: include the newly added routing information in a link state broadcast data packet LSA, and use the SGi interface to All routers in the area corresponding to the SGi interface broadcast the LSA.

When the SGi interface uses the routing information protocol RIP, the sending module 72 is specifically configured to: include the newly added routing information in the response data packet, and use the SGi interface to correspond to the area corresponding to the SGi interface. All routers periodically send the response packet.

Further, the sending module 72 is further configured to: when the UE deletes the PDN connection on the PGW, send a route deletion message to all routers in the area corresponding to the SGi interface, so that the SGi All the routers in the area corresponding to the interface delete the dynamic route according to the route deletion message, where the route deletion message includes a static IP address and a subnet mask of the UE.

The PGW provided in this embodiment may be used to implement the technical solution provided in the second embodiment of the method, and the specific implementation manner and technical effects are similar, and details are not described herein again. FIG. 9 is a schematic structural diagram of another router according to Embodiment 8 of the present invention. As shown in FIG. 9, the router 800 provided in this embodiment includes: a processor 81, a receiver 83, and a transmitter 84, wherein the receiver 83 The transmitter 84 is coupled to the processor 81 via a bus. The router 800 provided in this embodiment may further include: a memory 82, wherein the memory 82 stores execution instructions, when the router 800 is running, the processor 81 communicates with the memory 82, and the processor 81 executes execution instructions to cause the router 800 to execute the present invention. A method of keeping the IP address of the user equipment fixed.

The receiver 83 is configured to: when the user equipment UE establishes a packet data network PDN connection on the packet data gateway PGW, receive new routing information that is sent by the PGW to the SGi interface and is sent to the UE, where The newly added routing information includes a static internet protocol IP address and a subnet mask of the UE;

The processor 81 is configured to perform route learning according to the newly added routing information, to obtain a dynamic route to the UE, where the dynamic route includes: a destination address, the subnet mask, and a next hop address, where The destination address is a static IP address of the UE;

The receiver 83 is further configured to receive a downlink data packet sent by the network side to the UE.

The transmitter 84 is configured to send the downlink data packet to the PGW according to the destination IP address of the downlink data packet and the dynamic route.

When the UE deletes the PDN connection on the PGW, the receiver 83 is further configured to receive a route deletion message sent by the PGW, where the route deletion message includes a static IP address and a subnet mask of the UE. Correspondingly, the processor 81 deletes the dynamic route according to the route deletion message.

In this embodiment, the processor 81 is further configured to detect a status of the PGW, determine whether the PGW is faulty according to a status of the PGW, and delete the locally saved PGW when the processor 81 determines that the PGW is faulty. All routing entries in the routing information table, where the routing entries include the dynamic routing.

FIG. 10 is a schematic structural diagram of another PGW according to Embodiment 9 of the present invention. As shown in FIG. 10, the PGW 900 provided in this embodiment includes: a processor 91 and a transmitter 93, wherein the transmitter 93 passes through a bus and a processor. 91 connected. The PGW 900 provided in this embodiment may further include: a memory 92, wherein the memory 92 stores an execution instruction, and when the PGW 900 is running, the processor 91 and the storage The memory 92 communicates with each other, and the processor 91 executes the execution instructions such that the PGW 900 performs the method of keeping the user equipment IP address fixed by the present invention.

The processor 91 is configured to determine that the user equipment UE establishes a packet data network PDN connection on the PGW.

The transmitter 93 is configured to broadcast, by using the SGi interface, the newly added routing information that is sent to the UE to all the routers in the area corresponding to the SGi interface, where the newly added routing information includes the static internet protocol IP of the UE. The address and the subnet mask are used by all the routers in the area corresponding to the SGi interface to perform route learning according to the newly added routing information.

When the SGi interface adopts the open shortest path first OSPF protocol, the transmitter 93 is specifically configured to: include the newly added routing information in the link state broadcast data packet LSA, and connect the SGi interface to the SGi interface by using the SGi interface. All routers in the corresponding area broadcast the LSA.

When the SGi interface adopts the routing information protocol RIP, the transmitter 93 is specifically configured to: include the newly added routing information in the response data packet, and use the SGi interface to all routers in the area corresponding to the SGi interface. The response packet is sent periodically.

In this embodiment, when the UE deletes the PDN connection on the PGW, the transmitter

And sending a route deletion message to all routers in the area corresponding to the SGi interface, so that all routers in the area corresponding to the SGi interface delete the dynamic route according to the route deletion message, where the route deletion message is included. The static IP address and subnet mask of the UE.

The PGW provided in this embodiment may be used to implement the technical solution provided by the method embodiment 2. The specific implementation manner and technical effects are similar, and details are not described herein again.

In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of cells is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined or integrated. Go to another system, or some features can be ignored, or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. You can choose which one according to your actual needs. Some or all of the units implement the objectives of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a hardware plus software functional unit.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the method of various embodiments of the present invention. Part of the steps. The foregoing storage medium includes: a USB flash drive, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. medium.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed, that is, the device is installed. The internal structure is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

It should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

claims

1. A method for keeping the IP address of user equipment fixed, characterized by comprising: when the user equipment UE establishes a packet data network PDN connection on the packet data gateway PGW, the router receives the IP address broadcast by the PGW on the SGi interface and reaches the destination. The new routing information of the UE, wherein the new routing information includes the static Internet Protocol IP address and subnet mask of the UE; the router performs route learning based on the new routing information to obtain the route to the UE Dynamic routing, the dynamic routing includes: a destination address, the subnet mask and a next hop address, where the destination address is the static IP address of the UE;

The router receives the downlink data message sent by the network side to the UE, and sends the downlink data message to the PGW according to the destination IP address of the downlink data message and the dynamic route.

2. The method according to claim 1, further comprising:

When the UE deletes the PDN connection on the PGW, the router receives the route deletion message sent by the PGW, and the route deletion message includes the static IP address and subnet mask of the UE;

The router deletes the dynamic route according to the route deletion message.

3. The method according to claim 2, further comprising:

The router detects the status of the PGW and determines whether the PGW is faulty based on the status of the PGW;

When the router determines that the PGW is faulty, the router deletes the locally saved

All routing table entries of the PGW, and the routing table entries include the dynamic route.

4. A method for keeping the IP address of user equipment fixed, characterized by including: the packet data gateway PGW determines that the user equipment UE establishes a packet data network on the PGW

PDN connection;

The PGW broadcasts and sends new routing information to the UE through the SGi interface to all routers in the area corresponding to the SGi interface, where the new routing information includes the static Internet Protocol IP address and subnet of the UE. Mask is used for all routers in the area corresponding to the SGi interface to perform route learning based on the newly added routing information.

5. The method according to claim 4, characterized in that when the SGi interface adopts the open shortest path first OSPF protocol, the PGW corresponds to the SGi interface through the SGi interface All routers in the area broadcast and send the new routing information to the UE, including: the PGW includes the new routing information in the link state broadcast packet LSA, and sends the new routing information to the SGi through the SGi interface. All routers in the area corresponding to the interface broadcast and send the LSA.

6. The method according to claim 4, characterized in that when the SGi interface adopts the routing information protocol RIP, the PGW broadcasts the message to all routers in the area corresponding to the SGi interface through the SGi interface. New routing information of UE, including:

The PGW includes the new routing information in a response data packet, and regularly sends the response data packet to all routers in the area corresponding to the SGi interface through the SGi interface.

7. The method according to any one of claims 4 to 6, characterized in that, further comprising: when the UE deletes the PDN connection on the PGW, the PGW sends a message corresponding to the SGi interface to All routers in the area send a route deletion message, so that all routers in the area corresponding to the SGi interface delete the dynamic route according to the route deletion message. The route deletion message includes the static IP address and subnet of the UE. netmask.

8. A router, characterized by including:

A receiving module configured to, when the user equipment UE establishes a packet data network PDN connection on the packet data gateway PGW, receive the new routing information that is broadcast by the PGW on the SGi interface and reaches the UE, wherein, the new route The information includes the static Internet Protocol IP address and subnet mask of the UE;

A route learning module, configured to perform route learning based on the new routing information received by the receiving module, and obtain a dynamic route to the UE, where the dynamic route includes: a destination address, the subnet mask and the next Hop address, wherein the destination address is the static IP address of the UE; The receiving module is also used to receive the downlink data message sent by the network side to the UE; The sending module is used to receive at the receiving module When the network side sends the downlink data message to the UE, the downlink data message is sent to the PGW according to the destination IP address of the downlink data message and the dynamic route.

9. The router according to claim 8, further comprising a route deletion module; the receiving module is further configured to: when the UE deletes the PDN connection on the PGW, receive the PGW sent The route deletion message includes the static IP address and subnet mask of the UE; The route deletion module is configured to delete the dynamic route according to the route deletion message received by the receiving module.

10. The router according to claim 9, further comprising:

A fault detection module, used to detect the status of the PGW, and determine whether the PGW is faulty according to the status of the PGW;

The route deletion module is also configured to: when the fault detection module determines that the PGW is faulty, delete all locally saved routing table entries of the PGW, and the routing table entries include the dynamic route.

11. A packet data gateway PGW, which is characterized by including:

Determining module, used to determine that the user equipment UE establishes a packet data network PDN connection on the PGW;

A sending module, configured to broadcast and send the new routing information reaching the UE to all routers in the area corresponding to the SGi interface through the SGi interface, where the new routing information includes the static Internet Protocol IP address of the UE. and a subnet mask, so that all routers in the area corresponding to the SGi interface can perform route learning based on the newly added routing information.

12. The PGW according to claim 11, characterized in that when the SGi interface adopts the open shortest path first OSPF protocol, the sending module is specifically used to:

The newly added routing information is included in a link state broadcast packet LSA, and the LSA is broadcast and sent to all routers in the area corresponding to the SGi interface through the SGi interface.

13. The PGW according to claim 11, characterized in that when the SGi interface adopts Routing Information Protocol RIP, the sending module is specifically used to:

The newly added routing information is included in a response data packet, and the response data packet is regularly sent to all routers in the area corresponding to the SGi interface through the SGi interface.

14. The PGW according to any one of claims 11-13, characterized in that the sending module is also used to:

When the UE deletes the PDN connection on the PGW, it sends a route deletion message to all routers in the area corresponding to the SGi interface, so that all routers in the area corresponding to the SGi interface follow the route The deletion message deletes the dynamic route, and the route deletion message includes the static IP address and subnet mask of the UE.