WO2011150649A1

WO2011150649A1 - Method and device for reallocating packet data gateway

Info

Publication number: WO2011150649A1
Application number: PCT/CN2010/080250
Authority: WO
Inventors: 周青; 银宇; 胡颖; 王珊珊
Original assignee: 华为技术有限公司
Priority date: 2010-12-24
Filing date: 2010-12-24
Publication date: 2011-12-08
Also published as: CN102405658A; CN102405658B

Abstract

A method and device for reallocating packet data gateway are provided in the present invention, and relate to a mobile communication technical field. The method includes: when the path between a User Equipment (UE) and a first P-GW is changed, judging whether there is a second P-GW corresponding to a more optimized path or not, and whether the PDN connection between the UE and the first P-GW permits P-GW reallocation(101); if there is the second P-GW, and the PDN connection permits P-GW reallocation, triggering the UE to access a network through the second P-GW(102). The device includes: a judgement module and a reallocation module. The present invention can realize the P-GW reallocation, and more optimize the route in a packet network, improve the route effect by triggering UE to access the network through the second P-GW when there is the second P-GW corresponding to the more optimized path, and the PDN connection between the UE and the first P-GW permits P-GW reallocation.

Description

Method and apparatus for packet data gateway redistribution

The present invention relates to the field of mobile communication technologies, and in particular, to a method and apparatus for packet data gateway reallocation. Background art

The 3GPP (The 3rd Generation Partnership Project) defines the architecture of a new mobile communication network under the guidance of LTE (Long Term Evolution), called EPS (Evolved Packet System). ). In the EPS network, the P-GW (Packet Data Network Gateway) implements the function of the anchor point when the terminal moves, and is responsible for assigning an IP address to the UE (Using Device Equipment, User Equipment). Both the uplink and downlink data packets of the UE are sent through the P-GW.

In the prior art, the UE accesses the access network corresponding to the APN (Access Point Name) through the P-GW. Generally, each access network has a fixed corresponding P-GW, and the UE is connected through the P-GW. After entering the corresponding access network, the P-GW will not be changed. Even when the UE moves from one P-GW service area to another P-GW service area, only the original P-GW can be used. , unable to initiate P-GW redistribution. If the uplink and downlink data paths of the UE are no longer suitable at this time, as the traffic in the mobile packet network increases, the routing path in the packet network will become worse, and the routing efficiency will decrease. Summary of the invention

In order to solve the problems in the prior art, embodiments of the present invention provide a method and apparatus for packet data gateway reallocation. The technical solution is as follows:

A method for packet data gateway reallocation, the method comprising:

When the path between the user equipment UE and the first packet data gateway P-GW is changed, it is determined whether there is a second P-GW corresponding to the better path, and the group between the UE and the first P-GW Whether the data network PDN connection allows the P-GW to be redistributed;

If there is a second P-GW corresponding to the better path, and the PDN connection between the UE and the first P-GW allows the P-GW to be re-allocated, triggering the UE to connect through the second P-GW Into the network.

A device for reallocating a packet data gateway, the device comprising: a judging module, configured to determine, when the path between the user equipment UE and the first packet data gateway P-GW is changed, whether there is a second P-GW corresponding to the better path, and the UE and the first P- Whether the packet data network PDN connection between the GWs allows the P-GW to be redistributed;

a redistribution module, configured to: if the determining module determines that there is a second P-GW corresponding to a better path, and the PDN connection between the UE and the first P-GW allows the P-GW to be re-allocated, triggering The UE accesses the network through the second P-GW.

The foregoing technical solution provided by the embodiment of the present invention triggers the UE to pass the first step by judging and allowing the P-GW to be re-allocated when the PDN connection between the UE and the first P-GW is allowed to be re-allocated in the presence of the second P-GW corresponding to the better path. The two P-GWs access the network, thereby realizing the redistribution of the P-GW, solving the problem that the prior art cannot perform P-GW redistribution, and optimizing routing in the packet network, thereby improving routing efficiency. DRAWINGS

1 is a schematic diagram of an EPS network architecture according to an embodiment of the present invention;

2 is a flowchart of a method for reallocating a packet data gateway according to Embodiment 1 of the present invention;

3 is a flowchart of a method for reallocating a packet data gateway according to Embodiment 2 of the present invention;

4 is a flowchart of a method for re-allocating a packet data gateway according to Embodiment 3 of the present invention;

5 is a flowchart of a method for re-allocating a packet data gateway according to Embodiment 4 of the present invention;

6 is a structural diagram of an apparatus for reallocating a packet data gateway according to Embodiment 5 of the present invention. detailed description

In order to make the objects, the technical solutions and the advantages of the present invention more apparent, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

The embodiment of the present invention relates to an EPS network architecture. Referring to FIG. 1, the EPS network architecture mainly includes: a UE, an eNodeB (evolved base station), an MME (Mobility Management Entity), and an S-GW (Serving Gateway). And P-GW. The main functions of the eNodeB include layer entities of the air interface, establishment, management and release of control planes and user planes in the user communication process, and partial radio resource management; the MME is responsible for managing the mobility of the UE, S-GW It is a mobility anchor between the local mobility anchor and the 3GPP when the eNodeB switches, and the P-GW implements the anchor function when the terminal moves. The various embodiments are described in detail below based on the EPS network architecture.

Example 1

Referring to FIG. 2, this embodiment provides a method for packet data gateway reallocation, including: 101: When a path between the UE and the first P-GW is changed, determining whether there is a second P-GW corresponding to the better path, and whether the PDN connection between the UE and the first P-GW allows P- GW redistribution;

102: If there is a second P-GW corresponding to the better path, and the PDN connection between the UE and the first P-GW allows the P-GW to be reassigned, the UE is triggered to access the network through the second P-GW.

In this embodiment, the path change between the UE and the first P-GW includes but is not limited to the following:

The UE initiates a location update, the access mode of the UE changes, or the S-GW corresponding to the PDN (Packet Data Network) connection between the UE and the first P-GW changes.

The location update of the UE includes: TAU (Tracking Area Update) or RAU (Routing Area Update). UE access modes include: LTE, 3G, WiMax (Worldwide Interoperability for Microwave Access), CDMA (Code Division Multiple Access), WCDMA (Wideband Code Division Multiple Access) Multiple access) and so on.

In this embodiment, the P-GW reallocation attribute refers to an attribute related to the P-GW, which is used to reflect whether P-GW reallocation is allowed, and may be a specific attribute in the form of a P-GW redistribution indication. Pre-configured, it can also be a common attribute. The PDN is used to connect existing attributes to reflect whether P-GW redistribution is allowed. Specifically, including but not limited to at least one of the following:

APN attribute of the PDN connection between the UE and the first P-GW;

Data service status of the PDN connection; and

The attributes carried in the PDN connection.

Therefore, the obtaining the P-GW redistribution attribute may specifically include at least one of the following:

Obtaining an APN attribute of a PDN connection between the UE and the first P-GW;

Obtain the data service status of the PDN connection; and

Get the attributes carried in the PDN connection.

The APN attribute of the PDN connection includes, but is not limited to, a P-GW reallocation indication in the APN attribute of the PDN connection, where the content of the indication is to allow the P-GW to be re-allocated or not to be re-allocated by the P-GW; or, the PDN connection The embodiment of the present invention does not specifically limit whether the LBO (Local Breakout) is allowed in the APN attribute, whether the current APN is an emergency APN or the like.

The data service status of the PDN connection includes: Idle state (IDLE) or non-idle state.

The attributes carried in the PDN connection include, but are not limited to, a P-GW reallocation indication in the attributes carried in the PDN connection, the content of the indication is to allow the P-GW to be re-allocated or not allowed to be re-allocated by the P-GW; or, the PDN connection The current bearer in the attribute carried in is the GBR (Guaranteed BitRate) bearer or Non-GBR (non-guaranteed bit rate) The bearer and the like are not specifically limited in this embodiment of the present invention.

The foregoing method provided in this embodiment is generally performed by a network side, and may be performed by a single device, or may be performed by an existing device in the network side that integrates the foregoing functions, such as MME, S- in a 3GPP network. The embodiment of the present invention does not specifically limit the GW, the P-GW, the eNobeB, and the like.

The foregoing method provided by this embodiment determines that the second P-GW corresponding to the better path exists and the UE and the first

When the PDN connection between the P-GWs allows the P-GW to be reassigned, the UE is triggered to access the network through the second P-GW, thereby realizing the redistribution of the P-GW, and the P-GW redistribution cannot be performed in the prior art. The problem, and the routing in the packet network is more optimized, improving routing efficiency. Example 2

Referring to FIG. 3, this embodiment provides a method for re-allocating a packet data gateway, and the obtained P-GW redistribution attribute includes an APN attribute and a data service attribute as an example. The method specifically includes:

201: When the path between the UE and the first P-GW is changed, determine whether there is a second P-GW corresponding to the better path, and if yes, execute 202; otherwise, the process ends.

The path change between the UE and the first P-GW is the same as that described in Embodiment 1, and details are not described herein again. In this embodiment, a better path means that the path between the UE and the second P-GW is better than the path between the UE and the first P-GW. Comparing the two paths can be implemented by using existing methods, such as querying a mapping table in which P-GW and path information are saved, and comparing the parameters to determine a better path and a corresponding P-GW. Do not describe too much about this.

202: Obtain an APN attribute of a PDN connection between the UE and the first P-GW.

The APN attribute of the PDN connection can be obtained from the user subscription database, such as the HSS (Home Subscriber Server). Specifically, the APN attribute of the PDN connection may be transmitted on an interface between the device performing the method and the user subscription database, such as extending a specific APN for P-GW reallocation on the S6 interface between the MME and the HSS. Attributes, such as P-GW Allocation Allowed, etc., are not specifically limited in this embodiment of the present invention.

203: Determine, according to the APN attribute, whether the PDN connection allows P-GW to be re-allocated, and if yes, execute

204; Otherwise, the process ends.

According to the APN attribute, it is determined whether the PDN connection allows the P-GW to be re-allocated, as follows:

1) determining whether the acquired APN attribute includes a P-GW reallocation indication, and the indication is to allow the P-GW to be reassigned, and if yes, determining that the PDN connection allows the P-GW to be reassigned, if the indication is not allowed P - GW re-allocation, then it is determined that the PDN connection does not allow P-GW to redistribute; or 2) determining whether the LBO is allowed in the acquired APN attribute, if the LBO is allowed, determining that the PDN connection allows the P-GW to be re-allocated, and if the LBO is not allowed, determining that the PDN connection does not allow the P-GW to be re-allocated; or

3) determining, according to the obtained APN attribute, whether the current APN is an APN routed to the Home Routed, and if yes, determining that the PDN connection does not allow P-GW re-allocation, and if not, determining that the PDN connection allows P- GW redistribution; or,

4) It is determined whether the current APN is an emergency APN according to the acquired APN attribute, and if it is an emergency APN, it is determined that the PDN connection does not allow the P-GW to be reassigned, and if it is not an emergency APN, it is determined that the PDN connection allows the P-GW to be reassigned.

In this embodiment, the emergency APN refers to the access network corresponding to the APN used for emergency services. Generally, the emergency services have strict delay requirements. Therefore, the emergency APN does not allow the P-GW to be redistributed.

In addition, the APN attribute in this embodiment may be user granularity or network granularity. User granularity means that an APN attribute is set for each user in the same APN network. The APN attributes may be the same or different. Therefore, different users in the same APN network may have different APN attributes. The user APN attribute allows the P-GW to be reassigned, and some user APN attributes do not allow the P-GW to be reassigned. Network granularity means that an APN attribute is set for each APN network. Therefore, all users in the same APN network have the same APN attribute of P-GW redistribution.

204: Obtain the data service status of the PDN connection.

Specifically, it can be obtained whether the UE is in an idle state, or is obtained by the S-GW or the eNodeB reporting the data service status of the PDN connection.

205: Determine whether the acquired data service status of the PDN connection is an idle state, if yes, determine that the PDN connection allows the P-GW to be re-allocated, and perform 206; otherwise, determine that the PDN connection does not allow the P-GW to be re-allocated, and the process ends. .

In this embodiment, the idle state of the data service refers to a state in which the UE is idle and has no service. Therefore, the P-GW can be allowed to be redistributed so as not to have any impact on the service.

206: Trigger the UE accesses the network through the second P-GW, and the process ends.

In this implementation, the steps 202 to 203 and 204 to 205 may be reversed, or may be performed simultaneously. Of course, only 202 to 203 may be performed, or only 204 to 205 may be performed. In addition, it is determined whether there is a better path corresponding to The second P-GW, and the sequence of determining whether the PDN connection is allowed to be re-allocated by the P-GW may also be reversed, or may be performed at the same time, which is not specifically limited in this embodiment of the present invention.

The foregoing method provided in this embodiment obtains an APN attribute about a P-GW reallocation, and a data service status genus And determining, when determining that the PDN connection allows the P-GW to be re-allocated and there is a second P-GW corresponding to the better path, triggering the UE to access the network through the second P-GW, thereby implementing P- The redistribution of the GW solves the problem that the prior art cannot perform P-GW redistribution, and optimizes the routing in the packet network, thereby improving routing efficiency. In addition, when judging whether the P-GW is allowed to be re-allocated, determining according to the APN attribute and the data service state greatly reduces the impact of the P-GW redistribution on the service, and avoids initiating the P-GW for the inappropriate PDN connection. Assigning or initiating P-GW redistribution at an inappropriate time greatly enhances the user experience. Example 3

Referring to FIG. 4, this embodiment provides a method for re-allocating a packet data gateway, and the obtained P-GW redistribution attribute includes an APN attribute and a bearer attribute as an example. The method includes:

301 to 303: The same as 201 to 203 in Embodiment 2, and details are not described herein again.

304: Get the attributes carried in the PDN connection.

In this embodiment, the bearer on the PDN connection may be one or more, and may include: a default bearer or a dedicated bearer.

The attributes carried in the PDN connection are usually obtained during the establishment of the bearer. If the bearer has been established before the step, the obtaining in this step refers to reading the bearer attribute that has been obtained in the bearer establishment process.

The default bearer can be obtained from the user subscription database, such as from the HSS. Specifically, the bearer attribute of the PDN connection may be transmitted on an interface between the device performing the method and the user subscription database, such as extending a specific attribute on the S6 interface between the MME and the HSS as indicating P-GW reallocation. Attributes hosted in PDN connections, such as Bearer Disconnection Allowed

For proprietary bearers, the bearer attribute can be either AF (Application Function) or PCRF (Policy)

The Charging Rule Function is configured according to the service type and can be configured on different devices. For example, for the emergency service, the configuration of the bearer attribute is not allowed to be re-allocated by the P-GW. For the voice service, the configuration of the bearer attribute is not Allow P-GW to redistribute. For common Internet services, configure bearer attributes to allow P-GW to redistribute and so on. Specifically, in the dedicated bearer setup process, the bearer attribute needs to be transmitted on the interface of the device performing the method and the device storing the bearer attribute, such as the S11 interface between the MME and the S-GW, in the S-GW and the P - The S5/S8 interface between the GWs, and the Gxx series interface between the GW and the PCRF, extending and passing a specific bearer attribute indicating the P-GW reallocation, such as Bearer Disconnection Allowed, indicating that the bearer is allowed to be initiated. P-GW is redistributed.

305: Determine, according to the attributes carried in the obtained PDN connection, whether all bearers on the PDN connection allow P-GW reallocation, and if yes, determine that the PDN connection allows P-GW to re-allocate, and perform 306; otherwise, determine the above. The PDN connection does not allow the P-GW to be reassigned, and the process ends. Wherein, determining whether all bearers on the PDN connection allow P-GW reallocation, including:

Perform the following operations for each bearer on the PDN connection as the current bearer:

1) determining whether the P-GW re-allocation indication is included in the bearer attribute of the current bearer, and the indication is to allow the P-GW to be re-allocated, and if yes, determining that the current bearer allows the P-GW to be re-allocated, otherwise, determining that the current bearer is not allowed P-GW redistribution; or,

2) Determine whether the current bearer is a GBR bearer according to the bearer attribute of the current bearer. If it is a GBR bearer, it determines that the current bearer does not allow the P-GW to be reassigned. If it is a Non-GBR bearer, it determines that the current bearer allows the P-GW to be reassigned. .

306: Trigger the UE accesses the network through the second P-GW, and the process ends.

In this implementation, the steps 302 to 303 and the steps 304 to 305 may be reversed, or may be performed simultaneously. Of course, only 302 to 303 may be performed, or only 304 to 305 may be performed. In addition, it is determined whether there is a better path corresponding to the path. The second P-GW, and the sequence of determining whether the PDN connection is allowed to be re-allocated by the P-GW may also be reversed, or may be performed at the same time, which is not specifically limited in this embodiment of the present invention.

The foregoing method provided in this embodiment obtains the APN attribute about the P-GW reallocation, and the bearer attribute, and performs corresponding judgment, and determines that the PDN connection allows the P-GW to be redistributed and the second path corresponding to the better path exists. When the P-GW is used, the UE is triggered to access the network through the second P-GW, thereby realizing the redistribution of the P-GW, solving the problem that the prior art cannot perform P-GW redistribution, and making the routing in the packet network more complete. Optimization, improved routing efficiency. In addition, when judging whether P-GW re-allocation is allowed, the APN attribute and the bearer attribute are used for judgment, which greatly reduces the impact of P-GW redistribution on the service, and avoids P-GW redistribution for inappropriate PDN connection. Or initiate P-GW redistribution at an inappropriate time, greatly improving the user experience. Example 4

The steps of the triggering UE to access the network by using the second P-GW in the foregoing Embodiments 1 to 3 may specifically include: notifying the UE that the P-GW can be redistributed;

After receiving the notification, the UE deletes the PDN connection with the first P-GW;

The UE establishes a new PDN connection with the second P-GW, and if there is a service on the deleted PDN connection, the service is restored to the new PDN connection.

In this embodiment, a 3GPP network is taken as an example, and the process of P-GW redistribution in the foregoing Embodiments 1 to 3 is specifically described. Referring to FIG. 5, the process specifically includes:

401: The UE initiates a location update process, and a path between the UE and the P-GW1 changes.

Specifically, for the LTE access mode, the location update process is a TAU process, and for the 2G/3G access mode, The location update process is a RAU process; the MME receives the corresponding location update request.

402: The MME determines that there is a P-GW2 corresponding to the preferred path, obtains a P-GW reallocation attribute, and determines whether to allow P-GW reallocation according to the P-GW reallocation attribute, and the result of the determination is that P- is allowed. GW redistribution.

Specifically, the MME may adopt any one of Embodiments 1 to 3 to determine whether P-GW re-allocation is allowed.

403: The MME sends a P-GW re-allocation indication to the UE.

Specifically, the MME may send a separate notification message to the UE, or notify the UE by using a response message of the TAU/RAU, which is not specifically limited in this embodiment of the present invention.

404: After receiving the indication from the MME, the UE notifies the upper-layer application that the current PDN connection is about to be interrupted, and the upper-layer application can perform corresponding processing.

405: The UE deletes the PDN connection between the current and the P-GW1.

406: The UE establishes a new PDN connection with the P-GW2.

407: If there is a service on the PDN connection between the UE and the P-GW1, the UE restores the service to the new PDN connection between the UE and the P-GW2. If no service exists, the step may be omitted. End.

The foregoing method provided by the embodiment triggers the UE to delete the P-GW by acquiring the P-GW redistribution attribute and performing the corresponding judgment, and when determining that the P-GW is allowed to be re-allocated and there is a second P-GW corresponding to the better path. - PDN connection between GW1, establishing a PDN connection with P-GW2, thereby realizing P-GW redistribution, solving the problem that the prior art cannot perform P-GW redistribution, and making the packet network Routes are optimized to improve routing efficiency. In addition, when determining whether the P-GW is allowed to be re-allocated, determining according to at least one of the APN attribute, the data service status, and the bearer attribute, the impact of the P-GW redistribution on the service is greatly reduced, and the inappropriateness is avoided. The PDN connection initiates P-GW redistribution or initiates P-GW reallocation at an inappropriate time, greatly improving the user experience. Example 5

This embodiment provides the application of the foregoing embodiments 1 to 4 in different scenarios. In the first scenario, the P-GW is redistributed according to the APN attribute, and the process specifically includes:

S11: Users in Shanghai have their UEs attached in Shanghai, and a PDN connection is established between them and P-GW1 through an APN1.

1. During the establishment of the PDN connection 1, the MME obtains the APN attribute of the APN1 from the HSS; the APN is used to carry the normal IMS service, and the LBO is not allowed;

S12: The user takes a train from Shanghai to Beijing. After the train starts, the user initiates a voice call through the IMS service; S13: The train drives to Suzhou, and the UE initiates a handover and location update process;

S14: The MME receives the TAU request of the UE, and determines whether there is a better P-GW for consideration of route optimization. S15: The MME determines that there is a better P-GW2, and determines whether the PDN connection 1 is allowed to initiate P-GW re-allocation according to the APN attribute. Since the APN1 does not allow the LBO, the MME can determine that the P-GW is not currently allowed to be initiated. Redistribution

S16: After the voice call ends, the user initiates a PDN connection 2 through a new APN2, and the PDN connection 2 is used for Internet browsing. The MME obtains the P-GW redistribution attribute of the APN2 from the HSS to allow the P-GW to be initiated. Assignment

S17: The UE moves to Nanjing again, and the UE initiates a handover and location update process; the MME receives the TAU request, and determines whether there is a better P-GW3 due to route optimization considerations;

S18: The MME determines, according to the APN attribute of the APN2, whether the current PDN connection 2 is allowed to initiate the P-GW re-allocation. Since the APN for the Internet service can initiate the P-GW re-allocation, the MME initiates the P-GW for the PDN connection 2. The process of redistributing, deleting the PDN connection 2 between the UE and the P-GW2, establishing the PDN connection 3 between the UE and the P-GW3, and restoring the Internet service on the PDN connection 2 to the newly created PDN connection 3, the process End.

The following is a second scenario, which combines APN attributes and bearer attributes to determine P-GW redistribution. The process specifically includes:

S21: The user of Shanghai has its UE attached in Shanghai, and a PDN connection is established between the APN1 and the P-GW1. During the establishment of the PDN connection, the MME obtains the APN attribute of the APM and the PDN connection from the HSS. The attributes carried by the province are all allowed to initiate P-GW redistribution;

S22: The user takes a train from Shanghai to Beijing. After the train starts, the user initiates a voice call, and the voice call establishes a dedicated bearer, which is used for signaling and media at the same time. The MME obtains the P-GW reallocation attribute of the dedicated bearer from the PCRF to not allow the P-GW to be reassigned. The MME may also obtain the attribute of the dedicated bearer from the service information of the PCRF, for example, the service on the dedicated bearer is For emergency services, the dedicated bearer does not allow P-GW to be redistributed;

S23: The train drives to Suzhou, and the UE initiates a handover and location update process;

S24: The MME receives the TAU request, and determines that there is a better P-GW2 for route optimization.

S25: The MME determines, according to the APN attribute, that the P-GW re-allocation is allowed to be initiated, but because the dedicated bearer of the emergency service exists, the MME determines that the P-GW redistribution is not initiated.

S26: After the user's call ends, the dedicated bearer established by the voice call is deleted, and the user starts Internet browsing, and the Internet browsing is performed on the default bearer;

S27: The UE initiates the periodic TAIL MME to determine whether all the bearers on the PDN connection are allowed to initiate the P-GW re-allocation. Since the PDN connection has only the default bearer, and the default bearer allows the P-GW to be re-allocated, therefore, The MME initiates a P-GW redistribution process, which is the same as that in the foregoing embodiment, and details are not described herein again. The following is the third scenario, which combines APN attributes, data service status, and bearer attributes to determine P-GW redistribution. The process specifically includes:

S31: The user of Shanghai has its UE attached in Shanghai, and establishes a PDN connection with P-GW1 through an APN. During the establishment of the PDN connection, the MME obtains the P-GW redistribution attribute of the APN and the default bearer from the HSS. The APN allows the P-GW to be re-allocated. The default bearer allows the P-GW to be re-allocated in the case of traffic and no traffic. S32: The user takes the train from Shanghai to Beijing; after the train starts, the user initiates the voice. The call, the voice call establishes a dedicated bearer, and the dedicated bearer is used for both signaling and media. During the establishment of the dedicated bearer, the MME obtains the P-GW reallocation attribute of the proprietary bearer from the PCRF. The dedicated bearer does not allow to initiate P-GW reallocation in the case of traffic, and allows P-GW redistribution to be initiated without traffic;

S33: The train drives to Suzhou, and the UE initiates a handover and location update process;

S34: The MME receives the TAU request, and determines that there is a better P-GW2 for route optimization.

S35: The MME determines, according to the foregoing APN attribute, that the P-GW re-allocation is allowed to be initiated, and determines whether all the bearers on the PDN connection allow the P-GW to be re-allocated, because the dedicated bearer of the voice call exists, and the dedicated bearer is In the case of traffic, P-GW re-allocation is not allowed to be initiated, so the MME determines not to initiate P-GW reallocation;

S36: After the user's call ends, the dedicated bearer established by the voice call continues to exist, and the private bearer may not be deleted as needed, and the user starts Internet browsing, and the Internet browsing is performed on the default bearer;

S37: The UE initiates a periodic TAIL MME to determine whether all bearers on the current PDN connection are allowed to initiate P-GW re-allocation, because the default bearer on the PDN connection has traffic, and the default bearer is allowed in the case of traffic. Initiating a P-GW re-allocation, the dedicated bearer on the PDN connection has no traffic, and the dedicated bearer allows the P-GW to be re-allocated without traffic. Therefore, the MME initiates a P-GW reallocation process, specifically The descriptions in the above embodiments are not described herein again. Example 6

Referring to FIG. 6, this embodiment provides a device for reallocating a packet data gateway, including:

The determining module 501 is configured to determine, when the path between the UE and the first P-GW changes, whether there is a second P-GW corresponding to the better path, and a PDN connection between the UE and the first P-GW Whether to allow P-GW to redistribute;

The redistribution module 502 is configured to: if the determining module 501 determines that there is a second P-GW corresponding to the better path, and the PDN connection between the UE and the first P-GW allows the P-GW to be re-allocated, triggering the UE to pass The second P-GW accesses the network.

In this embodiment, the path change between the UE and the first P-GW includes:

The UE initiates a location update, a change in the access mode of the UE, or a packet data network PDN between the UE and the first P-GW. The connection of the corresponding service gateway S-GW is changed, which is specifically described in the method embodiment.

In this embodiment, the determining module 501 can include:

An obtaining unit, configured to acquire a P-GW reallocation attribute of a PDN between the UE and the first P-GW;

And a determining unit, configured to determine, according to the P-GW reallocation attribute, whether the PDN connection allows P-GW to be reassigned. Further, the obtaining unit may include at least one of the following obtaining subunits:

a first obtaining subunit, configured to acquire an access point name APN attribute of the PDN connection;

a second obtaining subunit, configured to acquire a data service state of the foregoing PDN connection; and

The third obtaining subunit is configured to obtain an attribute carried in the PDN connection.

In this embodiment, when the acquiring unit includes the first acquiring subunit, the determining unit may include:

a first determining sub-unit, configured to determine whether the acquired APN attribute includes a P-GW re-allocation indication, and the indication is to allow the P-GW to be re-allocated, and if yes, determining that the PDN connection allows the P-GW to be re-allocated; or ,

a second determining sub-unit, configured to determine whether the local LBO is allowed in the acquired APN attribute, and if yes, determining that the PDN connection allows the P-GW to be redistributed; or

The third determining subunit is configured to determine, according to the acquired APN attribute, whether the current APN is an emergency APN, and if not, determine that the PDN connection allows the P-GW to be reassigned.

In this embodiment, when the obtaining unit includes the second acquiring subunit, the determining unit may include:

The fourth determining subunit is configured to determine whether the data service status of the acquired PDN connection is an idle state, and if yes, determine that the PDN connection allows the P-GW to be reassigned.

In this embodiment, when the obtaining unit includes the third acquiring subunit, the determining unit may include:

The fifth determining sub-unit is configured to determine, according to the attributes carried in the obtained PDN connection, whether the bearer on the PDN connection allows the P-GW to be re-allocated, and if yes, determine that the PDN connection allows the P-GW to be re-allocated.

The above fifth determining subunit may be specifically used for:

Determining whether the P-GW re-allocation indication is included in the attribute of the bearer, and the indication is to allow the P-GW to be re-allocated, and if yes, determining that the bearer allows the P-GW to be re-allocated; or determining the attribute of the bearer Whether it is a GBR bearer, if it is not a GBR bearer, is a Non-GBR bearer, it is determined that the bearer allows P-GW to be redistributed.

In this embodiment, when there are multiple bearers in the PDN1 connection, specifically, it may be determined whether all bearers allow P-GW reallocation, and if yes, it is determined that the PDN connection allows P-GW reallocation, otherwise, determining The above PDN connection does not allow P-GW to be redistributed. The bearer of each of the bearers may be determined by using the method determined by the fifth determining subunit, and details are not described herein again.

In this embodiment, the redistribution module 502 can include: And a redistribution unit, configured to notify the UE to perform re-allocation of the P-GW, so that after receiving the notification, the UE deletes the PDN connection with the first P-GW, and establishes a PDN connection with the second P-GW.

Further, the redistribution unit may be further configured to: if there is a service on the PDN connection between the deleted UE and the first P-GW, restore the service to the PDN connection between the UE and the second P-GW. .

The foregoing apparatus provided by this embodiment may be integrated in an existing device on the network side, such as an MME, an eNodeB, an S-GW,

The P-GW and the like may also be integrated into a single device, which is not specifically limited in this embodiment of the present invention.

The foregoing apparatus provided in this embodiment obtains a P-GW redistribution attribute and performs corresponding judgment, and determines that a PDN connection between the UE and the first P-GW allows the P-GW to be re-allocated and that there is a better path corresponding to the P-GW. When the second P-GW is used, the UE is triggered to access the network through the second P-GW, thereby realizing the redistribution of the P-GW, solving the problem that the prior art cannot perform P-GW reallocation, and making the packet network Routes are optimized to improve routing efficiency. In addition, when determining whether the P-GW is allowed to be re-allocated, determining according to at least one of the APN attribute, the data service status, and the bearer attribute, the impact of the P-GW redistribution on the service is greatly reduced, and the inappropriateness is avoided. The PDN connection initiates a P-GW reallocation or initiates a P-GW reallocation at an inappropriate time, greatly improving the user experience. Finally, it should be understood that those skilled in the art can understand that all or part of the process of implementing the above embodiments can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable. In the storage medium, the program, when executed, may include the flow of an embodiment of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read only memory (ROM) or a random access memory (RAM).

The functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. The integrated modules, if implemented in the form of software functional modules and sold or used as separate products, may also be stored in a computer readable storage medium. The storage medium mentioned above may be a read only memory, a magnetic disk or an optical disk or the like. Each of the above described devices or systems can perform the methods of the corresponding method embodiments.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

Claim

A method for reallocating a packet data gateway, the method comprising:

If there is a second P-GW corresponding to the better path, and the PDN connection allows the P-GW to be re-allocated, the UE is triggered to access the network through the second P-GW.

The method according to claim 1, wherein the path change between the user equipment UE and the first packet data gateway P-GW comprises:

The UE initiates a location update, the access mode of the UE changes, or the serving gateway S-GW corresponding to the packet data network PDN connection between the UE and the first P-GW changes.

The method according to claim 1, wherein determining whether the packet data network PDN connection between the UE and the first P-GW allows the P-GW to be re-allocated includes:

Obtaining a P-GW reallocation attribute of a PDN between the UE and the first P-GW;

Determining whether the PDN connection allows P-GW reallocation according to the P-GW reallocation attribute.

The method according to claim 3, wherein the P-GW reallocation attribute of the PDN between the UE and the first P-GW is obtained, including at least one of the following:

Obtaining an access point name APN attribute of the PDN connection;

Obtaining a data service status of the PDN connection; and

Get the attributes carried in the PDN connection.

The method according to claim 4, wherein determining whether the PDN connection allows P-GW re-allocation according to the P-GW reallocation attribute comprises:

Determining whether the obtained APN attribute includes a P-GW reassignment indication, and the indication is to allow the P-GW to be reassigned, and if yes, determining that the PDN connection allows the P-GW to be reassigned; or

Determining whether the local LBO is allowed to be obtained in the obtained APN attribute, and if yes, determining the PDN connection permission Xu P-GW redistribution; or,

Whether the current APN is an emergency APN is determined according to the obtained APN attribute, and if not, it is determined that the PDN connection allows the P-GW to be reallocated.

Determining whether the acquired data service status of the PDN connection is an idle state, and if so, determining that the PDN connection allows the P-GW to be reassigned.

Determining, according to the obtained attributes of the PDN connection, whether the bearer on the PDN connection allows the P-GW to be redistributed;

If so, it is determined that the PDN connection allows P-GW to be reallocated.

The method according to claim 7, wherein determining whether the bearer on the PDN connection allows the P-GW to be redistributed includes:

Determining whether the P-GW re-allocation indication is included in the attribute of the bearer, and the indication is to allow the P-GW to be re-allocated, and if yes, determining that the bearer allows the P-GW to be re-allocated; or

It is determined whether the attribute of the bearer is a guaranteed bit rate GBR bearer, and if it is not a guaranteed bit rate bearer, it is determined that the bearer allows P-GW to be reallocated.

The method according to claim 1, wherein the triggering the UE to access the network by using the second P-GW includes:

Notifying the UE to perform re-allocation of the P-GW, so that after receiving the notification, the UE deletes the PDN connection with the first P-GW, and establishes a PDN connection with the second P-GW.

The method according to claim 9, wherein the triggering the UE to access the network by using the second P-GW includes:

If there is a service on the PDN connection between the deleted UE and the first P-GW, the service is restored to the location The PDN connection between the UE and the second P-GW is described.

11. A device for reallocating a packet data gateway, the device comprising:

a judging module, configured to determine, when the path between the user equipment UE and the first packet data gateway P-GW is changed, whether there is a second P-GW corresponding to the better path, and the UE and the first P- Whether the packet data network PDN connection between the GWs allows the P-GW to be redistributed;

a redistribution module, configured to: if the determining module determines that there is a second P-GW corresponding to a better path, and the PDN connection allows P-GW to re-allocate, triggering the UE to pass the second P- The GW accesses the network.

The device according to claim 11, wherein the user equipment UE and the first packet data gateway

Changes in the path between P-GWs include:

The device according to claim 11, wherein the determining module comprises:

An obtaining unit, configured to acquire a P-GW reallocation attribute of a PDN between the UE and the first P-GW, and a determining unit, configured to determine, according to the P-GW reallocation attribute, whether the PDN connection allows P- GW redistribution.

The apparatus according to claim 13, wherein the acquisition unit comprises at least one of the following acquisition subunits:

a second obtaining subunit, configured to acquire a data service status of the PDN connection; and

And a third obtaining subunit, configured to acquire an attribute carried in the PDN connection.

The device according to claim 14, wherein the determining unit comprises:

a first determining sub-unit, configured to determine whether the acquired APN attribute includes a P-GW re-allocation indication, and the indication is to allow P-GW to be re-allocated, and if yes, determine that the PDN connection allows P-GW Redistribution; or,

a second determining sub-unit, configured to determine whether the local LBO is allowed in the acquired APN attribute, and if yes, determining that the PDN connection allows the P-GW to be re-allocated; or

a third determining subunit, configured to determine, according to the obtained APN attribute, whether the current APN is an emergency APN, if If not, then it is determined that the PDN connection allows P-GW to be reallocated.

The device according to claim 14, wherein the determining unit comprises:

The fourth determining subunit is configured to determine whether the acquired data service status of the PDN connection is an idle state, and if yes, determine that the PDN connection allows the P-GW to be reassigned.

The device according to claim 14, wherein the determining unit comprises:

a fifth determining subunit, configured to determine, according to the acquired attributes of the PDN connection, whether the bearer on the PDN connection allows P-GW to be reassigned, and if yes, determine that the PDN connection allows the P-GW to be heavy distribution.

The apparatus according to claim 17, wherein the fifth determining sub-unit is specifically configured to: determine whether a P-GW reallocation indication is included in an attribute of the bearer, and the indication is to allow P- GW re-allocating, if yes, determining that the bearer allows P-GW to re-allocate; or determining whether the bearer attribute is a guaranteed bit rate GBR bearer, and if it is not a guaranteed bit rate bearer, determining that the bearer allows P- GW redistribution.

The device according to claim 11, wherein the redistribution module comprises:

a redistribution unit, configured to notify the UE to perform a P-GW re-allocation, so that after receiving the notification, the UE deletes a PDN connection with the first P-GW, and is in a second P-GW Establish a PDN connection between them.

The device according to claim 19, wherein the redistribution unit is further configured to:

If there is a service on the PDN connection between the deleted UE and the first P-GW, the service is restored to the PDN connection between the UE and the second P-GW.