CN110225475B

CN110225475B - User access method and core network

Info

Publication number: CN110225475B
Application number: CN201910411729.0A
Authority: CN
Inventors: 马泽芳
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2019-05-16
Filing date: 2019-05-16
Publication date: 2020-07-14
Anticipated expiration: 2039-05-16
Also published as: CN110225475A

Abstract

The embodiment of the invention provides a user access method and a core network, relates to the field of communication, and can accurately charge local flow under the condition of ensuring local shunt. The method comprises the following steps: the user terminal sends the position information of the user terminal to the SGW-C through the base station and the MME; the SGW-C selects a target SGW-U supporting local shunting according to the position information to establish a session; the SGW-C informs the PGW-C of the type of a target SGW-U, so that the PGW-C generates a local flow charging ID and a public network flow charging ID, and the two charging IDs are sent to the target SGW-U through the SGW-C, so that the target SGW-U corresponds the local flow charging ID and the public network flow charging ID to local flow and public network flow respectively when the target SGW-U counts the flow; and the SGW-C enables the base station and the user terminal to complete air interface side connection through the MME.

Description

User access method and core network

Technical Field

The present invention relates to the field of communications, and in particular, to a user access method and a core network.

Background

At present, when the mobile internet service is enriched day by day, the increase of mobile packet data traffic is brought about when the mobile packet data traffic bursts, which causes the pressure of a packet data gateway of a core network, and areas such as some government offices, campuses and the like require large traffic using experience with low delay and high bandwidth, so the edge computing and local offloading technology is a main means for solving the problem, from the perspective of ETSI (emergency telecommunications standards institute), the architecture of an edge computing platform system does not limit the network system, that is, the edge computing platform can simultaneously perform different user services such as L (long term evolution) users and 5G (5th-generation, fifth generation mobile communications technology) users, L TE local offloading and edge computing can achieve some local caching, offloading and wireless cross-layer optimization, can meet some specific scene requirements, can quickly occupy the market before 5G, but when L a standard organization sets a time for an international network, no consideration is given to local caching, offloading and wireless cross-layer optimization, it can not achieve local offloading and local offloading of local computing, therefore, the problem that the local offloading of local packet data traffic can not be performed by a local offload network element (local computing) through a local offload network element (local gateway) and a local offload technology, which is not capable of performing a local offload call monitoring operation of a local offload network c, and a local offload network c, thus, when the existing local offload network element is a local offload network element, a local offload network element (local offload network element, a local offload network element is a local call routing network element, a local call routing network monitoring network is not capable of a local network monitoring local network, a local network element, a local network monitoring network element, a local network element, a local network is not capable of a local network monitoring network node b, a local network element, a local network (local network element, a local network monitoring network is not capable of a local network, a local.

Disclosure of Invention

Embodiments of the present invention provide a user access method and a core network, which can implement local offloading and accurately charge a local flow diverted at the same time.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, a user access method is provided, including: a user terminal sends an attachment request to a mobile management entity MME through a base station; the attach request includes location information of the user terminal;

the MME sends a first session creation request carrying the position information of the user terminal to a serving gateway control plane (SGW-C);

the SGW-C selects a target service gateway user plane SGW-U corresponding to the position information according to the position information and establishes a session with the target SGW-U; the type of the target SGW-U is the SGW-U supporting local shunting;

the SGW-C sends a second session creation request carrying type information of the target SGW-U to a packet data network gateway control plane PGW-C; the type information of the target SGW-U is used for indicating the type of the target SGW-U;

the PGW-C generates a local flow charging identification code and a public network flow charging identification code according to the type information of the target SGW-C, and sends a second session creating response corresponding to the second session creating request to the SGW-C; the second creating session response carries the local flow charging identification code and the public network flow charging identification code;

the SGW-C sends the local flow charging identification code and the public network flow charging identification code to a target SGW-U, so that the target SGW-U counts the flow passing through the target SGW-U and respectively corresponds the local flow charging identification code and the public network flow charging identification code to the local flow and the public network flow;

and the SGW-C sends a first session creating response corresponding to the first session creating request to the MME so that the MME generates an attachment response corresponding to the attachment request and sends the attachment response to the user terminal through the base station so that the user terminal establishes air interface side connection.

The user access method provided in the foregoing embodiment uses a control plane and a user plane separation CUPS technology, and divides each core network element into two types, one type is a C-type network element (PGW-C and SGW-C) for a control plane, and the other type is a U-type network element (PGW-U and SGW-U) for a user plane, and then on the basis of a user access procedure for the CUPS technology, a preset offloading rule is set on a part of SGW-U, that is, a target SGW-U, in the whole procedure, so that the SGW-C selects the target SGW-U corresponding to the location information to establish a session, and in a manner of expanding a cell, the PGW-C informs the type information of the target SGW-U in a session establishment signaling between the SGW-C and the PGW-C, so that the PGW-C can generate a local traffic charging ID and a public network traffic flow meter for two different flows (local traffic and public network traffic) according to the information Charging ID, then PGW-C sends the two charging ID to SGW-U through SGW-C, and the rest completes the user access process according to the existing flow; in the embodiment of the invention, after the user access is finished, the target SGW-U used for executing the local shunt operation and the flow statistic operation in the core network can correspond the local flow to the local flow charging ID during the flow statistic, correspond the public network flow to the public network charging ID, and then the SGW-C or PGW-C can obtain corresponding information from the SGW-U when the call ticket needs to be charged, thereby finishing the accurate charging of different types of flow. Further, because the technical solution provided by the above embodiment sets the local breakout in the core network, and the change of the network element is not large, and mainly the cell is extended, the flow can be accurately charged and lawful interception of the flow can be ensured.

In a second aspect, there is provided an SGW-C comprising: a communication module and a processing module;

the communication module is used for receiving a first session creation request which is sent by an MME and carries the position information of the user terminal;

the processing module is used for selecting a target SGW-U corresponding to the position information according to the position information received by the communication module and establishing a session between the SGW-C and the target SGW-U by using the communication module; the type of the target SGW-U is the SGW-U supporting local shunting;

the processing module generates a second session creation request carrying type information of the target SGW-U; the type information of the target SGW-U is used for indicating the type of the target SGW-U;

the communication module is used for sending the second session creation request to the PGW-C;

the communication module is further configured to receive a second create session response corresponding to the second create session request sent by the PGW-C; the second creating session response carries the local flow charging identification code and the public network flow charging identification code;

the communication module is also used for sending the local flow charging identification code and the public network flow charging identification code to a target SGW-U; enabling the target SGW-U to respectively correspond the local flow charging identification code and the public network flow charging identification code to the local flow and the public network flow when the target SGW-U counts the flow passing through the target SGW-U;

the processing module is further used for generating a first creation session response corresponding to the first creation session request received by the communication module;

the communication module is further configured to send the first create session response generated by the processing module to the MME.

In a third aspect, a PGW-C is provided, comprising: a communication module and a processing module;

the communication module is used for receiving a second session creation request which is sent by the SGW-C and carries the type information of the target SGW-U; the type information of the target SGW-U is used for indicating the type of the target SGW-U, and the type of the target SGW-U is the SGW-U supporting local shunting;

the processing module is used for generating a local flow charging identification code and a public network flow charging identification code according to the type information of the target SGW-U received by the communication module and generating a second establishing session response corresponding to the second establishing session request; the second creating session response carries the local flow charging identification code and the public network flow charging identification code;

the communication module is further configured to send the second create session response generated by the processing module to the SGW-C.

In a fourth aspect, a core network is provided, which includes the SGW-C provided in the second aspect and the PGW-C provided in the third aspect.

The user access method and the core network provided by the embodiment of the invention comprise the following steps: a user terminal sends an attachment request to a mobile management entity MME through a base station; the attach request includes location information of the user terminal; the MME sends a first session creation request carrying the position information of the user terminal to a serving gateway control plane (SGW-C); the SGW-C selects a target service gateway user plane SGW-U corresponding to the position information of the user terminal according to the position information of the user terminal and establishes a session with the target SGW-U; the type of the target SGW-U is the SGW-U supporting local shunting; the SGW-C sends a second session creation request carrying type information of the target SGW-U to a packet data network gateway control plane PGW-C; the type information of the target SGW-U is used for indicating the type of the target SGW-U; the PGW-C generates a local flow charging identification code and a public network flow charging identification code according to the type information of the target SGW-C, and sends a second session creating response corresponding to the second session creating request to the SGW-C; the second creating session response carries the local flow charging identification code and the public network flow charging identification code; the SGW-C sends the local flow charging identification code and the public network flow charging identification code to a target SGW-U, so that the target SGW-U counts the flow passing through the target SGW-U and respectively corresponds the local flow charging identification code and the public network flow charging identification code to the local flow and the public network flow; and the SGW-C sends a first session creating response corresponding to the first session creating request to the MME so that the MME generates an attachment response corresponding to the attachment request and sends the attachment response to the user terminal through the base station so that the user terminal establishes air interface side connection. The technical scheme provided by the embodiment of the invention uses a CUPS technology for separating a control plane and a user plane, divides each core network element into two types, namely a C-type network element (PGW-C and SGW-C) for the control plane and a U-type network element (PGW-U and SGW-U) for the user plane, then sets a preset shunting rule on a part of SGW-U (target SGW-U) in the whole process on the basis of the existing user access process for the CUPS technology, so that the SGW-C selects the target SGW-U corresponding to the position information to establish the session, informs the type information of the target SGW-U of the PGW-C in a session establishment signaling between the SGW-C and the PGW-C in a mode of expanding cells, and enables the PGW-C to generate a local traffic charging ID and a public network traffic for two different flows (local traffic and public network traffic) according to the information The PGW-C sends the two charging IDs to the SGW-U through the SGW-C, and the rest completes the user access process according to the existing flow; in the embodiment of the invention, after the user access is finished, the target SGW-U used for executing the local shunt operation and the flow statistic operation in the core network can correspond the local flow to the local flow charging ID during the flow statistic, correspond the public network flow to the public network charging ID, and then the SGW-C or PGW-C can obtain corresponding information from the SGW-U when the call ticket needs to be charged, thereby finishing the accurate charging of different types of flow. Further, because the technical solution provided by the above embodiment sets the local breakout in the core network, and the change of the network element is not large, and mainly the cell is extended, the flow can be accurately charged and lawful interception of the flow can be ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic flowchart of a user access method according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a core network structure corresponding to a user access method according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a user access method according to another embodiment of the present invention;

fig. 4 is a schematic signaling interaction diagram of a user access method according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a core network according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of an SGW-C according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a PGW-C according to an embodiment of the present invention;

fig. 8 is a schematic diagram of a local offloading scheme based on an MEC platform according to the prior art.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

It should be noted that, in the embodiments of the present invention, "of", "corresponding" and "corresponding" may be sometimes used in combination, and it should be noted that, when the difference is not emphasized, the intended meaning is consistent.

Referring to fig. 8, in the prior art, a scheme based on an MEC platform is mainly adopted for local offloading of user traffic, that is, an MEC (mobile edge computing) platform is erected between a base station and a core network, service traffic sent by the base station of the MEC platform is identified, and then local offloading of traffic is performed according to a local offloading rule, but in this way, when a PGW issues a CDR (call detail record) ticket, the local traffic diverted to a local server does not pass through a core network element, monitoring calculation cannot be performed on the diverted local traffic, charging cannot be performed, and since lawful monitoring interfaces are all on the core network element, the local traffic cannot be lawfully monitored.

In view of the above problem, referring to fig. 1, an embodiment of the present invention provides a user access method, including:

101. the user terminal sends an attachment request to an MME (mobility management entity) through a base station; the attach request includes location information of the user terminal.

For example, the user identifier may be a user identification code, or a user subscription code or the like, which can indicate the user identity. The user terminal can be a mobile phone, a notebook computer, a server and other devices capable of performing information interaction with the base station.

102. The SGW-C selects a target SGW-U (serving gateway user plane) corresponding to the position information according to the position information and establishes a session with the target SGW-U; the type of the target SGW-U is the SGW-U supporting local breakout.

The SGW-U supporting local shunting is an SGW-U preset with local shunting (L BO, local shunt out), each area actually has the SGW-U supporting local shunting and the SGW-U not supporting local shunting at the same time, so that selection is needed, when the target SGW-U works, service flow which is matched with a L BO rule of the target SGW-U and can be processed locally is stripped off from a GTPU (general packet radio service) tunneling protocol, GPRS tunneling protocol) tunnel and packaged for uplink flow, the service flow is sent to a local server for processing, and for downlink flow, the local flow sent by the local server and the flow sent by a public network side are combined and sent to a RAN (radio access network) side.

103. The SGW-C sends a second session creation request carrying the type information of the target SGW-U to a PGW-C (PDN (packet data network) gateway-control, PDN gateway control plane); the type information of the target SGW-U is used for indicating the type of the target SGW-U.

104. The PGW-C generates a local flow charging identification code and a public network flow charging identification code according to the type information of the target SGW-C, and sends a second session creating response corresponding to the second session creating request to the SGW-C; and the second creating session response carries the local flow charging identification code and the public network flow charging identification code.

105. And the SGW-C sends the local flow charging identification code and the public network flow charging identification code to the target SGW-U so that the target SGW-U counts the flow passing through the target SGW-U and respectively corresponds the local flow charging identification code and the public network flow charging identification code to the local flow and the public network flow.

106. And the SGW-C sends a first session creating response corresponding to the first session creating request to the M ME so that the MME generates an attachment response corresponding to the attachment request and sends the attachment response to the user terminal through the base station so that the user terminal establishes air interface side connection.

The user access method provided by the embodiment of the invention uses a control plane and user plane separation CUPS technology to divide each core network element into two types, one type is C type network elements (PGW-C and SGW-C) for the control plane, and the other type is U type network elements (PGW-U and SGW-U) for the user plane, then on the basis of the existing user access process for the CUPS technology, a preset shunting rule is set on a part of SGW-U (target SGW-U) in the whole process, so that the SGW-C selects the target SGW-U corresponding to the position information to establish a session, and the type information of the target SGW-U is informed to the PGW-C in a session establishment signaling between the SGW-C and the PGW-C in a mode of expanding cells, so that the PGW-C can generate local flow charging ID and public network flow for two different flows (local flow and public network flow) according to the information Charging IDs, then the PGW-C sends the two charging IDs to the SGW-U through the SGW-C, and the rest completes the user access process according to the existing flow; in the embodiment of the invention, after the user access is finished, the target SGW-U used for executing the local shunt operation and the flow statistic operation in the core network can correspond the local flow to the local flow charging ID during the flow statistic, correspond the public network flow to the public network charging ID, and then the SGW-C or PGW-C can obtain corresponding information from the SGW-U when the call ticket needs to be charged, thereby finishing the accurate charging of different types of flow. Further, because the technical solution provided by the above embodiment sets the local breakout in the core network, and the change of the network element is not large, and mainly the cell is extended, the flow can be accurately charged and lawful interception of the flow can be ensured.

Illustratively, referring to fig. 2, signaling interaction is performed between an SGW-C and a PGW-C through an S5/S8-C interface, a signaling tunnel between the SGW-C and the PGW-C exists all the time when a core network is constructed, signaling interaction is performed between an MME and the SGW-C through an S11 interface, signaling interaction is performed between the SGW-C and any SGW-U (only a target SGW-U is shown in the figure) through an Sxa interface, a signaling tunnel also exists all the time when the SGW-C operates, a session connection is established between the SGW-C and the corresponding SGW-U according to requirements, a relationship between the PGW-C and the PGW-U and between the SGW-C and any SGW-U is the same as the relationship between the PGW-C and any SGW-U, the difference is that the signaling interaction is performed by using a Sxb interface, a data tunnel between the SGW-U and the PGW-U requires that the SGW-C and the PGW-U separately notify tunnel information of the w-U and PGW-U of the tunnel information of the SGW-U, and the data tunnel information of the SGW-U are transmitted through a public transport network interface, and a local data transport network interface of an SGW-U678678, and a local data transport network gateway.

Based on fig. 2 and the explanation of fig. 2, referring to fig. 3, an embodiment of the present invention further provides a user access method as a supplement to the user access method provided by the foregoing embodiment, where the method specifically includes:

301. the user terminal sends an attachment request to an MME (mobility management entity) through a base station; the attach request includes location information of the user terminal and a user identification.

302. The MME acquires subscription information of the user terminal according to the user identifier, and sends a first creation session request carrying the location information and the subscription information of the user terminal to an SGW-C (serving gateway-control).

Specifically, because the local server in some areas only allows registered users to log in, for example, an intranet in a school, it is necessary to obtain the subscription information of the user according to the user identifier in addition to the location information of the user terminal, so as to determine whether the traffic of the user terminal can be diverted to the local server.

Since the tunnel information of the SGW-U (SGW S5S8-U F-TEID (full-tunnel end identifier)) needs to be sent to the PGW-U through the SGW-C and the PGW-C, as shown in fig. 3, the step 303 specifically includes:

3031. and when the SGW-C determines that the user terminal can carry out local distribution according to the subscription information, the SGW-C selects a target SGW-U corresponding to the position information according to the position information of the user terminal.

3032. And the SGW-C establishes a session with the target SGW-U and acquires the tunnel information of the target SGW-U.

Specifically, referring to fig. 4, the SGW-C establishing a session with the target SGW-U specifically includes: the SGW-C sends a request for creating a session (Sx session request) to a target SGW-U; 3. and the target SGW-U applies for the resource to create the user session and sends a session establishment response to the SGW-C. Because the tunnel information of the SGW-U may be allocated by the SGW-C or may be allocated by itself, any message of the create session request and the session setup response carries the tunnel information of the SGW-U.

Because the SGW-C further needs to send the tunnel information of the target SGW-U to the PGW-U through the PGW-C, so that data transmission can be performed between the SGW-U and the PGW-U, as shown in fig. 3, step 304 specifically includes:

304. the SGW-C sends a second session creation request carrying type information and tunnel information of a target SGW-U to the PGW-C; the type information of the target SGW-U is used for indicating the type of the target SGW-U.

305. And the PGW-C generates a local flow charging identification code and a public network flow charging identification code according to the type information of the target SGW-C.

306. The PGW-C selects a packet data network gateway user plane PGW-U to establish a session according to a preset rule, sends the tunnel information of the target SGW-U to the PGW-U, and simultaneously obtains the tunnel information of the PGW-U.

Specifically, the preset rule generally refers to selecting a PGW-U with a small load which is less occupied by an access user when selecting the PGW-U according to a load sharing principle.

Exemplarily, referring to fig. 4, before the PGW-C establishes a session with the PGW-U, the PGW-C should also perform 5 in sequence, perform interaction with the authentication server AUTH to complete authentication; 6. interacting with a Policy and Charging Rules Function (PCRF) to acquire policy information; 7. and interacts with an OCS (online charging system) to acquire charging information.

307. And the PGW-C sends a second created session response corresponding to the second created session request to the SGW-C, wherein the second created session response carries the local traffic charging identification code, the public network traffic charging identification code and the tunnel information of the PGW-U.

Step 306 and step 307 exist because in practice the PGW-C should establish a session with the PGW-U and acquire tunnel information of the PGW-U (PGW S5S8-U F-TEID) before returning the second create session response to the SGW-C, and then inform the SGW-C of the tunnel information of the PGW-U so that the SGW-U is informed of it when returning the create session response.

3081. And the SGW-C sends the local flow charging identification code and the public network flow charging identification code to the target SGW-U so that the target SGW-U counts the flow passing through the target SGW-U and respectively corresponds the local flow charging identification code and the public network flow charging identification code to the local flow and the public network flow.

3082. And the SGW-C sends the tunnel information of the PGW-U to a target SGW-U.

Specifically, referring to fig. 4, 3082 includes: the method comprises the steps that 11, an SGW-C sends a session modification request (Sx session modification request) message to an SGW-U, wherein the message carries tunnel information of a PGW-U; and 12, the SGW-U stores the tunnel information of the PGW-U and returns a session modification response (Sx session modification response) to the SGW-C.

309. And the SGW-C sends a first session creating response corresponding to the first session creating request to the MME so that the MME generates an attachment response corresponding to the attachment request and sends the attachment response to the user terminal through the base station so that the user terminal establishes air interface side connection.

Wherein, the first creating session response and the attaching response both comprise the tunnel information of the target SGW-U.

310. And the MME acquires the tunnel information of the base station and sends the tunnel information of the base station to the target SGW-U through the SGW-C.

Specifically, the

steps

309 and 310 are executed to enable the base station and the SGW-U to know the user plane tunnel information of the other party, respectively, so that the base station and the SGW-U can perform service traffic data transmission.

Illustratively, referring to fig. 4, the step 310 specifically includes: the MME sends a modification bearer request (modification bearer request) to the SGW-C, wherein the modification bearer request carries tunnel information eNodeB 1-U F-TEID of the base station; 15, the SGW-C sends a session modification request (Sx session modification request) message to a target SGW-U and informs the SGW-U of the tunnel information of a base station; 16. the target SGW-U stores eNodeB S1-U F-TEID information and returns a session modification response (Sx session modification response) to the SGW-C, so that the target SGW-U can forward an uplink data message and a downlink data message; the SGW-C returns a modify bearer response (modify bearer response) message to the MME.

Specifically, referring to fig. 2, after the user access process is completed, uplink traffic sent by the base station is shunted by the target SGW-U, the local traffic enters the local server, and the public network traffic enters the public network Internet through the PGW-U; and the downlink flow returned by the public network is sent to the base station through the PGW-U and the SGW-U.

The user access method provided by the embodiment of the invention comprises the following steps: a user terminal sends an attachment request to a mobile management entity MME through a base station; the attach request includes location information of the user terminal; the MME sends a first session creation request carrying the position information of the user terminal to a serving gateway control plane (SGW-C); the SGW-C selects a target service gateway user plane SGW-U corresponding to the position information of the user terminal according to the position information of the user terminal and establishes a session with the target SGW-U; the type of the target SGW-U is the SGW-U supporting local shunting; the SGW-C sends a second session creation request carrying type information of the target SGW-U to a packet data network gateway control plane PGW-C; the type information of the target SGW-U is used for indicating the type of the target SGW-U; the PGW-C generates a local flow charging identification code and a public network flow charging identification code according to the type information of the target SGW-C, and sends a second session creating response corresponding to the second session creating request to the SGW-C; the second creating session response carries the local flow charging identification code and the public network flow charging identification code; the SGW-C sends the local flow charging identification code and the public network flow charging identification code to a target SGW-U, so that the target SGW-U counts the flow passing through the target SGW-U and respectively corresponds the local flow charging identification code and the public network flow charging identification code to the local flow and the public network flow; and the SGW-C sends a first session creating response corresponding to the first session creating request to the MME so that the MME generates an attachment response corresponding to the attachment request and sends the attachment response to the user terminal through the base station so that the user terminal establishes air interface side connection. The technical scheme provided by the embodiment of the invention uses a control plane and user plane separation CUPS (control and user plane separation) technology to divide each core network element into two types, one type is a C type network element (PGW-C and SGW-C) aiming at a control plane, and the other type is a U type network element (PGW-U and SGW-U) aiming at a user plane, then on the basis of the existing user access flow aiming at the CUPS technology, a preset flow distribution rule is set on a part of SGW-U (target SGW-U) in the whole flow, so that the SGW-C selects the target SGW-U corresponding to the position information to establish the session, and the type information of the target SGW-U is informed to the PGW-C in the session establishment signaling between the SGW-C and the PGW-C in a mode of expanding cells, so that the PGW-C can generate local traffic aiming at two different flows (local traffic and public network traffic ID charging) according to the information And public network flow charging ID, then PGW-C sends these two kinds of charging ID to SGW-U through SGW-C, the others finish the user's access process according to the existing procedure; in the embodiment of the invention, after the user access is finished, the target SGW-U used for executing the local shunt operation and the flow statistic operation in the core network can correspond the local flow to the local flow charging ID during the flow statistic, correspond the public network flow to the public network charging ID, and then the SGW-C or PGW-C can obtain corresponding information from the SGW-U when the call ticket needs to be charged, thereby finishing the accurate charging of different types of flow. Further, because the technical solution provided by the above embodiment sets the local breakout in the core network, and the change of the network element is not large, and mainly the cell is extended, the flow can be accurately charged and lawful interception of the flow can be ensured.

Referring to fig. 5, an embodiment of the present invention provides a core network 01, which includes an SGW-C02 and a PGW-C03.

Referring to fig. 6, an SGW-C02 in the core network 01 according to the embodiment of the present invention includes a communication module 61 and a processing module 62;

a communication module 61, configured to receive a first session creation request carrying location information of a user equipment sent by an MME 04;

the processing module 62 is configured to select a target SGW-U05 corresponding to the location information according to the location information received by the communication module 61, and establish a session between the SGW-C02 and the target SGW-U05 by using the communication module 61; the type of the target SGW-U05 is the SGW-U supporting local breakout;

the processing module 62 generates a second session creation request carrying the type information of the target SGW-U05; the type information of the target SGW-U05 is used for indicating the type of the target SGW-U05;

a communication module 61, configured to send a second create session request to the PGW-C03;

the communication module 61 is further configured to receive a second create session response corresponding to the second create session request sent by the PGW-C03; the second creating session response carries the local flow charging identification code and the public network flow charging identification code;

the communication module 61 is further configured to send the local traffic charging identification code and the public network traffic charging identification code to the target SGW-U05; enabling the target SGW-U05 to respectively correspond the local traffic charging identification code and the public network traffic charging identification code to the local traffic and the public network traffic when the traffic passing through the target SGW-U05 is counted;

the processing module 62 is further configured to generate a first create session response corresponding to the first create session request received by the communication module 61;

the communication module 61 is further configured to send the first create session response generated by the processing module 62 to the MME 04.

Optionally, the communication module 61 is configured to receive a first session creation request that is sent by the MME04 and carries the location information of the user terminal and the subscription information of the user terminal;

the processing module 62 is configured to select a target SGW-U05 corresponding to the location information according to the location information when determining that the user terminal can perform local offloading according to the subscription information received by the communication module 61.

Optionally, the communication module 61 is further configured to obtain tunnel information of the target SGW-U05; the second create session request also carries tunnel information for the target SGW-U05.

Optionally, the second create session response further includes tunnel information of the PGW-U06.

Optionally, the communication module 61 is further configured to send the tunnel information of the PGW-U06 to the target SGW-U05.

Optionally, the first create session response includes tunnel information of the target SGW-U.

Optionally, the communication module 61 is further configured to receive the tunnel information of the base station sent by the MME04, and send the tunnel information of the base station to the target SGW-U05.

Referring to fig. 7, a PGW-C03 in a core network 01 according to an embodiment of the present invention includes: a communication module 71 and a processing module 72;

the communication module 71 is configured to receive a second session creation request that is sent by the SGW-C02 and carries type information of the target SGW-U05; the type information of the target SGW-U05 is used for indicating the type of the target SGW-U05, and the type of the target SGW-U05 is the SGW-U05 supporting local shunting;

a processing module 72, configured to generate a local traffic charging identifier and a public network traffic charging identifier according to the type information of the target SGW-U05 received by the communication module 71, and generate a second create session response corresponding to the second create session request; the second creating session response carries the local flow charging identification code and the public network flow charging identification code;

the communication module 71 is further configured to send the second create session response generated by the processing module 72 to the SGW-C02.

Optionally, the second create session request further carries tunnel information of the target SGW-U05.

Optionally, before the communication module 71 sends the second session creation response to the SGW-C02, the processing module 72 is further configured to select a PGW-U06 according to a preset rule, and establish a session with the PGW-U06 through the communication module 71;

the communication module 71 is further configured to send the tunnel information of the target SGW-U05 to the PGW-U06, and obtain the tunnel information of the PGW-U06;

the second create session response also includes the tunnel information of PGW-U06.

The core network provided by the embodiment of the invention comprises an SGW-C and a PGW-C; the SGW-C comprises a communication module and a processing module; the communication module is used for receiving a first session creation request which is sent by an MME and carries the position information of the user terminal; the processing module is used for selecting a target SGW-U corresponding to the position information according to the position information received by the communication module and establishing a session between the SGW-C and the target SGW-U by using the communication module; the type of the target SGW-U is the SGW-U supporting local shunting; the processing module generates a second session creation request carrying type information of the target SGW-U; the type information of the target SGW-U is used for indicating the type of the target SGW-U; the communication module is used for sending the second session creation request to the PGW-C; the communication module is further configured to receive a second create session response corresponding to the second create session request sent by the PGW-C; the second creating session response carries the local flow charging identification code and the public network flow charging identification code; the communication module is also used for sending the local flow charging identification code and the public network flow charging identification code to a target SGW-U; enabling the target SGW-U to respectively correspond the local flow charging identification code and the public network flow charging identification code to the local flow and the public network flow when the target SGW-U counts the flow passing through the target SGW-U; the processing module is further used for generating a first creation session response corresponding to the first creation session request received by the communication module; the communication module is further configured to send the first create session response generated by the processing module to the MME. The PGW-C comprises a communication module and a processing module; the communication module is used for receiving a second session creation request which is sent by the SGW-C and carries the type information of the target SGW-U; the type information of the target SGW-U is used for indicating the type of the target SGW-U, and the type of the target SGW-U is the SGW-U supporting local shunting; the processing module is used for generating a local flow charging identification code and a public network flow charging identification code according to the type information of the target SGW-U received by the communication module and generating a second establishing session response corresponding to the second establishing session request; the second creating session response carries the local flow charging identification code and the public network flow charging identification code; the communication module is further configured to send the second create session response generated by the processing module to the SGW-C. It can be seen that, in the technical solution provided in the embodiment of the present invention, a control plane and user plane separation CUPS technology is used, each core network element is divided into two types, one type is a C-type network element (PGW-C and SGW-C) for a control plane, and the other type is a U-type network element (PGW-U and SGW-U) for a user plane, then on the basis of the existing user access procedure for the CUPS technology, a preset offloading rule is set on a part of SGW-U, i.e., a target SGW-U, in the whole procedure, so that the SGW-C selects the target SGW-U corresponding to the location information to establish a session, and in a manner of expanding a cell, the type information of the target SGW-U of the PGW-C is notified in a session establishment signaling between the SGW-C and the PGW-C, so that the PGW-C can generate a local charging flow ID and a public network flow ID for two different flows (a local flow and a public network) and a public network flow according The PGW-C sends the two charging IDs to the SGW-U through the SGW-C, and the rest completes the user access process according to the existing flow; in the embodiment of the invention, after the user access is finished, the target SGW-U used for executing the local shunt operation and the flow statistic operation in the core network can correspond the local flow to the local flow charging ID during the flow statistic, correspond the public network flow to the public network charging ID, and then the SGW-C or PGW-C can obtain corresponding information from the SGW-U when the call ticket needs to be charged, thereby finishing the accurate charging of different types of flow. Further, because the technical solution provided by the above embodiment sets the local breakout in the core network, and the change of the network element is not large, and mainly the cell is extended, the flow can be accurately charged and lawful interception of the flow can be ensured.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A user access method, comprising:

a user terminal sends an attachment request to a mobile management entity MME through a base station; the attach request includes location information of the user terminal;

the SGW-C sends a second session creation request carrying the type information of the target SGW-U to a packet data network gateway control plane (PGW-C); the type information of the target SGW-U is used for indicating the type of the target SGW-U;

the PGW-C generates a local flow charging identification code and a public network flow charging identification code according to the type information of the target SGW-C, and sends a second establishing session response corresponding to the second establishing session request to the SGW-C; the second creating session response carries the local flow charging identification code and the public network flow charging identification code;

the SGW-C sends the local flow charging identification code and the public network flow charging identification code to the target SGW-U, so that the target SGW-U counts the flow passing through the target SGW-U, and the local flow charging identification code and the public network flow charging identification code respectively correspond to the local flow and the public network flow;

and the SGW-C sends a first session creating response corresponding to the first session creating request to the MME so that the MME generates an attachment response corresponding to the attachment request, and sends the attachment response to the user terminal through the base station so that the user terminal establishes air interface side connection.

2. The user access method according to claim 1, wherein the attach request further includes a user identifier;

before the MME sending the first create session request carrying the location information of the user equipment to the SGW-C, the method further includes: the MME acquires subscription information of the user terminal according to the user identifier;

the sending, by the MME, the first create session request carrying the location information of the user terminal to the SGW-C includes: the MME sends a first session creation request carrying the position information of the user terminal and the subscription information of the user terminal to the SGW-C;

the SGW-C selecting a target SGW-U corresponding to the position information according to the position information comprises the following steps: and when the SGW-C determines that the user terminal can carry out local distribution according to the subscription information, selecting a target SGW-U corresponding to the position information according to the position information.

3. The user access method of claim 1,

when the SGW-C establishes a session with the target SGW-U, the method further includes: the SGW-C acquires the tunnel information of the target SGW-U;

and the second session creating request also carries the tunnel information of the target SGW-U.

4. The user access method of claim 3,

before the sending, by the PGW-C, a second create session response corresponding to the second create session request to the SGW-C, the method further includes: the PGW-C selects a packet data network gateway user plane (PGW-U) to establish a session according to a preset rule, sends the tunnel information of the target SGW-U to the PGW-U, and simultaneously acquires the tunnel information of the PGW-U;

the second create session response further includes tunnel information of the PGW-U.

5. The subscriber access method according to claim 4, wherein the SGW-C further comprises, when sending the local traffic charging identifier and the public network traffic charging identifier to the target SGW-U:

and the SGW-C sends the tunnel information of the PGW-U to the target SGW-U.

6. The user access method of claim 3, wherein the first create session response includes tunnel information of the target SGW-U;

the attach response includes tunnel information for the target SGW-U.

7. The user access method according to claim 1, further comprising:

and the MME acquires the tunnel information of the base station and sends the tunnel information of the base station to the target SGW-U through the SGW-C.

8. An SGW-C, comprising a communication module and a processing module;

the processing module is configured to select a target SGW-U corresponding to the location information according to the location information received by the communication module, and establish a session between the SGW-C and the target SGW-U by using the communication module; the type of the target SGW-U is the SGW-U supporting local shunting;

the processing module generates a second session creation request carrying the type information of the target SGW-U; the type information of the target SGW-U is used for indicating the type of the target SGW-U;

the communication module is configured to send the second create session request to a PGW-C;

the communication module is further configured to send the local traffic charging identification code and the public network traffic charging identification code to the target SGW-U; enabling the target SGW-U to respectively correspond the local flow charging identification code and the public network flow charging identification code to local flow and public network flow when the target SGW-U counts the flow passing through the target SGW-U;

the processing module is further configured to generate a first create session response corresponding to the first create session request received by the communication module;

9. The SGW-C according to claim 8, wherein the communication module is configured to receive a first create session request sent by an MME and carrying location information of a user terminal and subscription information of the user terminal;

and the processing module is used for selecting a target SGW-U corresponding to the position information according to the position information when determining that the user terminal can carry out local distribution according to the subscription information received by the communication module.

10. The SGW-C of claim 8, wherein the communication module is further configured to obtain tunnel information of the target SGW-U; and the second session creating request also carries the tunnel information of the target SGW-U.

11. The SGW-C of claim 8, wherein the second Create Session response further comprises tunnel information for the PGW-U.

12. The SGW-C of claim 11, wherein the communication module is further configured to send tunnel information of the PGW-U to the target SGW-U.

13. The SGW-C of claim 11, wherein the first create session response includes tunnel information for the target SGW-U.

14. The SGW-C of claim 8, wherein the communication module is further configured to receive tunnel information of a base station sent by the MME, and send the tunnel information of the base station to the target SGW-U.

15. A PGW-C, comprising: a communication module and a processing module;

the communication module is used for receiving a second session creation request which is sent by an SGW-C and carries type information of a target SGW-U, wherein the SGW-C selects the target SGW-U corresponding to the position information according to the position information; the type information of the target SGW-U is used for indicating the type of the target SGW-U, and the type of the target SGW-U is the SGW-U supporting local shunting;

the processing module is configured to generate a local traffic charging identification code and a public network traffic charging identification code according to the type information of the target SGW-U received by the communication module, and generate a second created session response corresponding to the second created session request; the second creating session response carries the local flow charging identification code and the public network flow charging identification code;

16. The PGW-C of claim 15, wherein the second create session request further carries tunnel information of the target SGW-U.

17. The PGW-C of claim 16, wherein the processing module is further configured to select a PGW-U according to a preset rule before the communication module sends the second create session response to the SGW-C, and establish a session with the PGW-U through the communication module;

the communication module is further configured to send the tunnel information of the target SGW-U to the PGW-U, and acquire the tunnel information of the PGW-U;

18. A core network comprising an SGW-C according to any one of claims 8 to 14 and a PGW-C according to any one of claims 15 to 17.