WO2011050663A1

WO2011050663A1 - Method and system for tunnel update in communication system supporting local internet protocol (ip) access

Info

Publication number: WO2011050663A1
Application number: PCT/CN2010/076886
Authority: WO
Inventors: 王静; 周娜; 霍玉臻; 梁爽
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-10-28
Filing date: 2010-09-14
Publication date: 2011-05-05
Also published as: CN102056136B; CN102056136A

Abstract

A method for a tunnel update in a communication system supporting local Internet Protocol (IP) access is disclosed in the present invention. The method includes the following steps: a user terminal being in idle status, when a mobility management component receives a downlink data notification from a data buffer unit, and the user terminal has already activated local IP access, the mobility management component initiates the update of the local IP access transmission tunnels between a wireless side network element and the data buffer unit, and between the wireless side network element and the local access gateway; or, according to the source of the downlink data, the update of tunnels, which are for local IP to access downlink buffer data transmission, is initiated between the wireless side network element and the local access gateway, and selectively between the wireless side network element and the data buffer unit. A system implementing the above method is disclosed by the present invention at the same time. The technical solutions of the present invention are simple and practical.

Description

Tunnel update method and system in communication system supporting local IP access

The present invention relates to a tunnel update technology in a local IP access (LIPA or SIPTO) function activation state, and more particularly to a tunnel update method and system in a communication system supporting local IP access. Background technique

In order to maintain the competitiveness of the third generation mobile communication system in the field of communication, it provides mobile terminals with faster speed, lower delay and more personalized for the user terminal, and at the same time reduces the operating cost of the operator, the third generation cooperation The 3GPP (3rd Generation Partnership Project) Standards Working Group is working on the Evolved Packet System (EPS). FIG. 1 is a schematic structural diagram of an evolved packet domain system. As shown in FIG. 1, the entire EPS system is divided into two parts: a radio access network and a core network. In the core network, a Home Subscriber Server (HSS), a Mobility Management Entity (MME), a Serving GPRS Support Node (SGSN), and a Policy Charging Rules function are included. PCRF, Policy and Charging Rule Function), Service Gateway (S-GW, Serving Gateway), Packet Data Gateway (P-GW, PDN Gateway), and Packet Data Network (PDN). The function of each part is described in detail below: The home subscriber terminal server is the permanent storage location of the subscriber terminal subscription data, and is located in the home network signed by the user terminal. The mobility management entity is the storage location of the user terminal subscription data in the current network, responsible for the non-access layer signaling management of the user terminal to the network, the security verification function of the user terminal, the mobility management of the user terminal, and the user terminal idle mode. Tracking and paging management functions and bearer management. The service GPRS support node is a service support point for the GERAN and UTRAN user terminals to access the core network, and is similar in function to the mobility management entity, and is responsible for location update, paging management, and bearer management functions of the user terminal. Service gateway, which is the gateway from the core network to the wireless system, negative Responsible for user plane to core network user plane, user terminal idle mode data buffer, network side to initiate service request function, lawful interception and packet data routing and forwarding function; service gateway is responsible for counting user terminal using wireless network, And generating a CDR of the user terminal using the wireless network, and transmitting the CDR to the charging gateway. The packet data gateway is a gateway of the evolved system and the external packet data network of the system, and is connected to the Internet and the packet data network, and is responsible for the Internet Protocol (IP) address allocation, the charging function, the packet filtering, and the packet filtering of the user terminal. Features such as policy control. The packet data network is an operator's IP service network, which provides IP services for user terminals through the operator's core network. The policy charging rule function entity is a server in the evolution system responsible for providing rules for charging control, online credit control, threshold control, and quality of service (QoS) policies. The radio access network is composed of an evolved base station (eNB, E-UTRAN NodeB) and a 3G radio network controller (RNC, Radio Network Control), and is mainly responsible for transmitting and receiving wireless signals, and contacting the user terminal through the air interface to manage the air interface. Radio resources, resource scheduling, access control.

The above service GPRS support node is an upgraded SGSN, which can support the S4 interface with the service gateway and communicate with the mobility management unit using the GTPv2 protocol. For the SGSN supporting the 3G core network, the PS domain network architecture is different from that of Figure 1. At this time, the SGSN and the MME are connected by the Gn interface, and the GTPvl protocol is used for interworking. The SGSN cannot connect to the serving gateway, and connects to the gateway GPRS support node (GGSN, Gateway GPRS Support Node) through the Gn interface to directly access the packet data network.

A home base station (HNB, Home NodeB) or an evolved home base station is a type of small, low-power base station. As a dedicated resource of some user terminals, it is deployed in private places such as homes, groups, companies, or schools, mainly to give User terminals provide higher traffic rates and reduce the cost of using high-rate services while compensating for the deficiencies of existing distributed cellular wireless communication systems. The advantages of a home base station are affordability, convenience, low power output, plug and play, broadband access, use of single mode user terminals, and the like. 2 is a schematic diagram of a first structure of a radio side network element accessing a core network. As shown in FIG. 2, a home base station can be directly connected to a core network. Figure 3 is a schematic diagram of the second structure of the wireless network element accessing the core network. As shown in Figure 3, the home base station can also access the core network through the logical network element of the home base station gateway. The main functions of the home base station gateway are: The security of the home base station, processing the registration of the home base station, performing operation and maintenance management on the home base station, configuring and controlling the home base station according to the operator's requirements, and exchanging data of the core network and the home base station. 4 is a schematic diagram of a third structure of a wireless side network element accessing a core network. As shown in FIG. 4, a home base station can be connected to a core network through a wireless side network element. As shown in FIG. 2, FIG. 3, and FIG. 4, in order to implement a local IP access function (or SIPTO (Selected IP Traffic Offload)), the user terminal refers to other IP devices in the home network, IP devices in the enterprise network, or specific IPs. Local access to the network, a local gateway is added, and the addition of the local access gateway can provide strong support for the local IP access technology. The local gateway can be combined with the wireless side network element or near the wireless side network element (ie, external) It can also be combined with the home base station gateway or near the home base station gateway (ie, external). The local gateway can be local

SGW (L-SGW, Local SGW), local PGW (L-PGW, Local PGW), local GGSN (L-GGSN, Local GGSN), external local L-GW, etc.

FIG. 5 is a schematic diagram of a data flow path of local IP access and traditional core network IP access. As shown in FIG. 5, a traditional core network IP access data path and a local IP access data path can be established for a user terminal that supports local IP access. For the local IP access connection, the local IP access data path is from the user terminal to the wireless side network element to the local access gateway (L-SGW, L-PGW, L-GGSN), and the data transmission does not pass through the core network. In order to implement local access of the user terminal to other IP devices of the home network or a specific IP network, two connections may be established, and the first local IP access data path directly accesses a specific IP network (local access connection of a specific IP network). The second local IP access data path directly accesses other IP devices on the home network (local access connections to the home network). After the local IP access connection is established for the user terminal, the local IP access data transmission path in the connected state. When the user terminal does not receive or transmit data for local IP access for a long time, the wireless The side network element releases the air interface connection to make the user terminal enter the idle state. If the local IP access data of the user terminal arrives, the local access gateway may send the data to the serving gateway of the core network for caching, and then send the cached data when the user terminal is paged to the connected state. In this way, the local IP access data is not lost, the user terminal is provided with good service awareness, and the existing network element resources of the core network can be reused, and the data caching function of the local access gateway does not need to be added, and the device is simple to implement. .

The method of caching the local IP access data by the core network service gateway causes the user terminal to have two data channels simultaneously transmitting data to the wireless side in the connected state. However, at present, the core network mobility management unit only performs tunnel update to the data cache network element when transferring the user terminal to the connection state to establish the user plane. This will cause the local IP access direct tunnel to be established and the normal local IP access function cannot be implemented. Summary of the invention

In view of this, the main object of the present invention is to provide a tunnel update method and system in a communication system supporting local IP access, which can establish a direct tunnel for local IP access when receiving downlink data of a user terminal in an idle state.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A tunnel update method in a communication system supporting local IP access, including:

When the core network mobility management component receives the downlink data notification of the data buffer unit and the user terminal has activated the local IP access, the mobility management component initiates between the wireless side network element and the data cache unit and the Updating the tunnel between the wireless side network element and the local access gateway; or, the mobility management component initiates between the wireless side network element and the local access gateway and optionally according to the downlink buffer data source An update to a tunnel between the wireless side network element and the data cache unit.

Preferably, the mobility management component comprises a mobility management entity in a long term evolution system

The serving GPRS support node SGSN in the MME or General Packet Radio Service GPRS system. Preferably, when the mobility management component is an MME, the data cache unit is located in a serving gateway of the core network. The mobility management component initiates a tunnel update, including:

The MME initiates paging to the user terminal, and establishes a radio bearer with the user terminal by using the radio side network element, where the radio side network element is established with the user terminal. Notifying the MME of the identifier of the downlink tunnel corresponding to the radio bearer;

Notifying the local access gateway and the serving gateway of the identifier of the downlink tunnel, and updating the tunnel of the local access gateway to the radio side network element for local IP access downlink data transmission, And updating the tunnel of the serving gateway to the radio side network element for local IP access downlink buffer data transmission; the downlink buffer data of the local IP access is used by the serving gateway to the radio side network element Transmitting, by the local IP, a tunnel for downlink buffer data transmission to the user terminal;

The local IP access downlink data after the user terminal is paged to the connection state is sent to the user terminal by using the local access gateway to the tunnel for the local IP access downlink data transmission of the radio side network element.

Alternatively, the mobility management component initiates a tunnel update, including:

The serving gateway notifies the MME of the received access gateway address of the downlink data or the access gateway identifier by using a downlink data notification message;

Determining, by the MME, the source of the downlink data according to the access gateway address of the downlink data or the identifier of the access gateway, and if the downlink data is from the core network, the MME uses the downlink tunnel Notifying the local access gateway that only the tunnel for the local IP access downlink data transmission between the radio side network element and the local access gateway is updated, and the local access gateway information saved on the serving gateway is deleted. If the downlink data is derived from the local connection The MME notifies the local access gateway and the core network, and the MME notifies the local access gateway and the serving gateway of the identifier of the downlink tunnel, and updates the local access gateway and the wireless a tunnel between the side network elements for local IP access downlink data transmission, and a tunnel for updating the data buffer for local IP access downlink buffer between the service gateway and the radio side network element;

The local IP access downlink buffer data is sent to the user terminal by the serving gateway to the tunnel for the local IP access downlink buffer data transmission of the radio side network element, where the user goes to the radio side network element. A tunnel for local IP access downlink data transmission is sent to the user terminal.

And the MME notifying the identifier of the downlink tunnel and the local access gateway address to the tunnel of the buffered data transmission, and the serving gateway notifying the local access gateway of the identifier of the downlink tunnel, updating a tunnel between the local access gateway and the radio side network element for local IP access downlink data transmission;

The local IP access downlink buffer data is sent to the user terminal through a tunnel between the serving gateway and the radio side network element for local IP access downlink buffer data transmission; A tunnel for the local IP access downlink data transmission is sent to the user terminal.

Preferably, when the mobility management component is an SGSN, the data cache unit is located at the location Said in the SGSN. The mobility management component initiates a tunnel update, including:

The SGSN initiates paging to the user terminal, and establishes a radio bearer with the user terminal by using the radio side network element, where the radio side network element is established with the user terminal. Notifying the SGSN of the identifier of the downlink tunnel corresponding to the radio bearer;

The SGSN directly sends the local IP access downlink buffer data to the user terminal according to the downlink tunnel identifier, and the SGSN notifies the local access gateway of the identifier of the downlink tunnel, and updates the local a tunnel between the access gateway and the radio side network element for local IP access downlink data transmission; the local IP access downlink data after the user terminal pages to the connection state passes the local access gateway to the A tunnel for the local IP access downlink data transmission of the radio side network element is sent to the user terminal.

Preferably, the wireless side network element comprises a home base station, a macro base station, and a home base station gateway. Preferably, the tunnel between the radio side network element and the local access gateway is used for local IP access downlink data transmission; the tunnel between the radio side network element and the data cache unit is used for local IP access. Downstream cache data transfer.

Preferably, the local IP access comprises: access by the user terminal to an IP device of the home network or an IP device of the enterprise network, and access by the user terminal to the specific IP network through the home network, the enterprise network or the macro cellular network.

A tunnel update system in a communication system supporting local IP access, including:

a data buffer unit, configured to cache the downlink data;

a confirmation unit, located in the mobility management component of the core network, configured to confirm that the data buffer unit receives downlink data of the user terminal, and the user terminal has activated local IP access, triggering the first update unit; or, confirming If the downlink data is only from the core network, triggering the second update unit, otherwise triggering the first update unit;

a first update unit, configured to update a tunnel between the radio side network element and the data cache unit and between the radio side network element and the local access gateway; and/or And a second updating unit, configured to update a tunnel between the wireless side network element and the local access gateway, and delete local access gateway information saved on the serving gateway.

MME or General Packet Radio Service GPRS System Service GPRS Support Node SGSN.

Preferably, when the mobility management component is an MME, the data cache unit is located in a serving gateway of the core network. The system also includes:

a paging unit, located in the MME, configured to initiate paging to the user terminal, and a bearer establishing unit, configured to establish a radio bearer between the radio side network element and the user terminal;

a first notification unit, located in the radio side network element, configured to notify the MME of an identifier of a downlink tunnel corresponding to the radio bearer established between the radio side network element and the user terminal;

The first update unit includes:

a notification subunit, located in the MME, for notifying the local access gateway and the serving gateway of the identifier of the downlink tunnel;

a first establishing sub-unit, located in the local access gateway, configured to establish a tunnel for local IP access downlink data transmission between the local access gateway and the radio side network element; And located in the serving gateway, configured to establish a tunnel between the serving gateway and the radio side network element for local IP access downlink buffer data transmission;

a first sending subunit, configured to send the local IP access downlink buffer data to the user terminal by using a tunnel established between the serving gateway and the radio side network element;

a second sending subunit, configured to send the local IP access downlink data to a tunnel established between the local access gateway and the radio side network element when the user terminal pages to a connected state User terminal.

Alternatively, the system further includes:

a second notification unit, configured to receive the downlink data in the downlink data notification message Notifying the MME by the ingress gateway address or the access gateway identifier;

a first notification unit, located in the radio side network element, configured to notify the MME of an identifier of a downlink tunnel established between the radio side network element and the user terminal;

a determining unit, located in the MME, configured to determine, according to the access gateway address of the downlink data or the access gateway identifier, the downlink data source, if the downlink data is only from the core network, triggering The second update unit, otherwise triggering the first more unit;

The first update unit includes:

a notification subunit, configured to notify the local access gateway and the serving gateway of the identifier of the downlink tunnel;

a first establishing sub-unit, located in the local access gateway, configured to establish a tunnel for local IP access downlink data transmission between the local access gateway and the radio side network element;

a second establishing sub-unit, located in the serving gateway, configured to establish a tunnel between the serving gateway and the radio side network element for local IP access downlink buffer data transmission;

a first sending subunit, configured to send the local IP access downlink buffer data to the user terminal by using a tunnel established between the service gateway and the radio side network element;

a second sending subunit, configured to send the local IP access downlink data to the tunnel established by the local access gateway and the radio side network element when the user terminal pages to a connected state User terminal

The second update unit includes:

a notification subunit, located in the MME, configured to notify the local access gateway of the identifier of the downlink tunnel;

Establishing a subunit, located in the local access gateway, for using the local access gateway and a tunnel established between the wireless side network elements for local IP access downlink data transmission; a sending subunit, configured to pass the local IP access downlink data to the local device when the user terminal pages to a connected state Transmitting a tunnel established between the access gateway and the radio side network element to the user terminal;

And releasing a subunit, located in the MME, for deleting local access gateway information in the serving gateway.

Alternatively, the system further includes:

The first update unit includes:

a first notification subunit, configured to notify the service gateway of the identifier of the downlink tunnel and the local access gateway address;

a first establishing sub-unit, located in the serving gateway, configured to establish a tunnel to the radio side network element for local IP access downlink buffer data transmission;

a first sending subunit, configured to send the local IP access downlink buffer data to the user terminal by using a tunnel established by the first establishing subunit;

a second notification subunit, located in the serving gateway, configured to notify the local access gateway of the identifier of the downlink tunnel;

a second establishing subunit, located in the local access gateway, configured to establish a tunnel between the local access gateway and the radio side network element for local IP access downlink data transmission; and a second sender a unit, configured to send the local IP access downlink data to the user end through a tunnel established by the second establishing subunit when the user terminal pages to a connected state Preferably, when the mobility management component is an SGSN, the data cache unit is located in the SGSN. The system also includes:

a paging unit, located in the SGSN, configured to initiate paging to the user terminal, and a bearer establishing unit, configured to establish a radio bearer between the radio side network element and the user terminal;

a notification unit, located in the radio side network element, configured to notify the SGSN of an identifier of a downlink tunnel established between the radio side network element and the user terminal;

The first update unit includes:

a first sending sub-unit, located in the SGSN, configured to directly send the local IP access downlink buffer data to the user terminal according to the downlink tunnel identifier;

a notification subunit, located in the SGSN, configured to notify the local access gateway of the identifier of the downlink tunnel;

Establishing a subunit, configured to establish a tunnel between the local access gateway and the radio side network element for local IP access downlink data transmission;

Preferably, the local IP access comprises: the user terminal accessing the IP device of the home network or the IP device of the enterprise network, and the access of the user terminal to the specific IP network through the home network, the enterprise network or the macro cellular network. In the present invention, when the user terminal is in an idle state and the user terminal has activated local IP access, and when it is determined that the downlink data of the user terminal is received, the mobility management component of the core network initiates the pair of radio side network elements. Having a tunnel update between the data cache units of the downlink data and between the radio side network element and the local access gateway, and when determining that the downlink data is from the core network, the radio side network element may not be initiated. The update of the tunnel for the local IP access downlink buffer data transmission with the data buffer unit ensures the normal implementation of the local IP access function, and the solution of the present invention is simple and practical. DRAWINGS

1 is a schematic structural diagram of an evolved packet domain system;

2 is a schematic diagram of a first structure of a radio side network element accessing a core network;

3 is a schematic diagram of a second structure of a wireless side network element accessing a core network;

4 is a schematic diagram of a third structure of a wireless side network element accessing a core network;

5 is a schematic diagram of a data flow path of a local IP access and a traditional core network IP access; FIG. 6 is a flow chart of a local IP access tunnel update of a core network of an LTE system according to an embodiment of the present invention;

7 is a flowchart of a local IP access tunnel update of a GPRS system core network according to Embodiment 2 of the present invention;

FIG. 8 is a flowchart of a local IP access tunnel update of a core network of an LTE system according to Embodiment 3 of the present invention; FIG.

FIG. 9 is a flowchart of a local IP access tunnel update performed by a core network of an LTE system according to Embodiment 4 of the present invention; FIG.

FIG. 10 is a schematic structural diagram of a tunnel update system in a communication system supporting local IP access according to the present invention. detailed description

The basic idea of the present invention is: when the user terminal is in an idle state and the local IP access function is activated, the mobility management component of the core network determines that the downlink side data of the user terminal is received, and the wireless side network element and the cache station are initiated. a tunnel update between the data buffer units of the downlink data and between the radio side network element and the local access gateway, and only when determining that the downlink data originates from the core network, the radio side network element may not be initiated. The tunnel update between the data cache units ensures the normal implementation of the local IP access function, and the solution of the present invention is simple and practical.

The present invention will be further described in detail below with reference to the accompanying drawings.

FIG. 6 is a flow chart of the local IP access tunnel update of the core network of the LTE system according to the embodiment of the present invention. As shown in FIG. 6, the local network access tunnel update of the LTE system core network in this embodiment includes the following steps:

Step 601: When the user terminal is in an idle state, the core network mobility management entity MME transfers the downlink tunnel accessed by the local IP to the core network side, and sends the data to the service gateway of the core network when the local access gateway receives the downlink data. Cache. If the downlink data is received from the core network access gateway, the data can also be sent to the same data cache unit (by the service gateway cache).

Step 602: After receiving the downlink data, the serving gateway notifies the core network mobility management entity by using a downlink data notification message.

Step 603: The core network mobility management entity triggers paging in the wireless side network element in the coverage area of the user terminal registration area, and sends a paging message to the user terminal.

Step 604: The user terminal receives the paging message and responds to the paging by initiating a service request message. Step 605: The core network mobility management entity establishes an air interface bearer for the user terminal, and in the initial context setup request message, all the established uplink tunnel identifiers, security contexts, and wireless The bearer quality of service QoS parameters are sent to the radio side network element.

Step 606: The radio side network element establishes a radio bearer with the user terminal according to the indication information of the core network.

Step 607: The radio side network element returns an initial context setup complete message to the core network mobility management entity after the air interface bearer establishment is completed, where the downlink tunnel identifier of the user plane data channel allocated by the radio side network element is carried.

Step 608: The core network mobility management entity determines that the downlink data of the current user terminal arrives and the user terminal has activated the local IP access function, and the core network mobility management unit determines that the wireless side network element needs to be updated to the serving gateway and the wireless side. Two tunnels from the NE to the local access gateway.

Step 609: The core network mobility management entity brings the downlink tunnel identifier allocated by the radio side network element to the local access gateway by modifying the bearer request message.

Step 610: The local access gateway replies with the tamper response message.

Step 611: The wireless side network element learns the uplink tunnel identifier of the local IP access in step 605, and the local access gateway obtains the downlink tunnel identifier allocated by the radio side network element in step 609, and the local IP access uplink and downlink data can be normally transmitted.

Step 612: The core network mobility management entity brings the downlink tunnel identifier allocated by the radio side network element to the serving gateway by modifying the bearer request message. Step 613: The serving gateway replies to modify the bearer response message.

Step 614: After receiving the downlink tunnel identifier allocated by the radio side network element, the serving gateway sends the buffered downlink data to the user terminal, and the local IP access uplink data of the user terminal is sent in step 611, and no longer passes through the serving gateway.

In the actual application, the establishment of the local IP access direct tunnel and the establishment of the local IP access forwarding tunnel are not in the order, that is, steps 609 to 611 and steps 612 to 614 in this example. Can be done in parallel.

In addition, when the serving gateway receives the downlink data sent from the core network access gateway, the foregoing steps in this embodiment are also performed, and the local IP access downlink data tunnel needs to be established even if there is no local IP access downlink data. The local IP can be directly applied when accessing downlink data, and will not be described here.

Services supporting the S4 interface The GPRS support node is equivalent to the mobility management entity in the application, and can be equally covered, and will not be described here.

FIG. 7 is a flowchart of a local IP access tunnel update of a GPRS system core network according to Embodiment 2 of the present invention. As shown in FIG. 7, the local IP access tunnel update of the GPRS system core network in this embodiment specifically includes the following steps:

Step 701: When the user terminal is in an idle state, the core network serving GPRS support node transfers the downlink tunnel accessed by the local IP to the core network side, and when the local access gateway receives the downlink data, sends the data to the core network service GPRS support node. Cache. If the downlink data is received from the core network access gateway, the data can also be sent to the same data buffer unit (cached by the serving GPRS support node).

Step 702: The core network service GPRS support node triggers paging in the wireless side network element in the coverage area of the user terminal registration area.

Step 703: The user terminal receives the paging message and responds to the paging by initiating the service request message. Step 704: The core network service GPRS support node establishes an air interface bearer for the user terminal, and sends the uplink tunnel identifier, the transport layer information, the RAB bearer parameter, and the like of all the established links to the radio side network element in the RAB assignment request message.

Step 705: The radio side network element establishes a radio bearer with the user terminal according to the indication information of the core network.

Step 706: The radio side network element provides the serving GPRS support node after the air interface bearer establishment is completed. And responding to the RAB assignment response message, where the downlink tunnel identifier allocated by the radio side network element is carried. Step 707: If the serving GPRS support node determines that the downlink data of the current user terminal arrives and the user terminal has activated the local IP access function, the serving GPRS support node determines that the data tunnel between the wireless side network element and the local access gateway needs to be updated. Used to transmit local IP access downlink data. Because the local IP access downlink buffer data is cached in the serving GPRS support node in step 701, the serving GPRS support node can directly deliver the buffered downlink data after obtaining the downlink tunnel identifier allocated by the radio side network element carried in step 706. There is no need for the serving GPRS support node to initiate a PDP context update operation to the corresponding cache unit (on the aforementioned service gateway).

Step 708: The core network service GPRS support node sends the downlink tunnel identifier allocated by the radio side network element to the local access gateway by updating the PDP context request message.

Step 709: The local access gateway replies with a modify bearer response message.

Step 710: The wireless side network element learns the uplink tunnel identifier of the local IP access link through the step 704, and the local access gateway obtains the downlink tunnel identifier allocated by the radio side network element in step 708, and the local IP access uplink and downlink data can be normally transmitted.

Step 711: The core network service GPRS support node sends the buffered downlink data to the user terminal after receiving the downlink tunnel identifier allocated by the radio side network element, and the local IP access uplink data of the user terminal is sent in step 710, and no longer passes the core network service. GPRS support node.

In practical applications, the establishment of the local IP access direct tunnel and the establishment of the local IP access forwarding tunnel are not sequential, and steps 708 and 711 of the present invention can be performed in parallel.

In addition, when the core network serving GPRS support node receives the downlink data sent from the core network access gateway, the foregoing steps in this embodiment are also performed, and the local IP access downlink data tunnel needs to be established even if there is no local IP access downlink data. It can be directly applied when there is a local IP access downlink data, and will not be described in the process. FIG. 8 is a flowchart of a local IP access tunnel update of a core network of an LTE system according to Embodiment 3 of the present invention. As shown in FIG. 8, the local network access tunnel update of the LTE system core network in this embodiment specifically includes the following steps:

Step 801: When the user terminal is in an idle state, the core network mobility management entity transfers the downlink tunnel accessed by the local IP to the core network side, and then sends the received downlink data to the service when the local access gateway receives the downlink data. The gateway caches. If the downstream data is received from the core network access gateway, the data can also be cached to the same data cache unit.

Step 802: After receiving the downlink data, the serving gateway notifies the core network mobility management entity by using a downlink data notification message. The message carries the access gateway address or the access gateway identification information that receives the downlink data.

Step 803: The core network mobility management entity triggers paging in the wireless side network element in the coverage area of the user terminal registration area.

Step 804: The user terminal receives the paging message and responds to the paging by initiating the service request message. Step 805: The core network mobility management entity establishes an air interface bearer for the user terminal, and sends the uplink tunnel identifier, the security context, the radio bearer QoS parameter, and the like of all the established links to the radio side network element in the initial context establishment request message.

Step 806: The radio side network element establishes a radio bearer with the user terminal according to the indication information of the core network.

Step 807: The radio network element returns an initial context setup complete message to the core network mobility management entity after the air interface bearer is established, and carries the downlink tunnel identifier of the user plane data channel allocated by the radio side network element.

Step 808: If the core network mobility management entity determines that the downlink data of the current user terminal arrives and the user terminal has activated the local IP access function, and determines the downlink according to the access gateway address or the access gateway identifier indicated by the data buffer unit. Source of data, then core network shift The dynamic management entity determines whether it is necessary to update the wireless side network element to the service gateway for transmitting the local

IP access tunnels that cache data. specific:

When the core network mobility management entity knows that the downlink data source is the local access gateway, it needs to be more

When the core network mobility management entity learns that the downlink data source is the core network access gateway, it does not need to delete the local access gateway information in the serving gateway.

When the core network mobility management entity learns that the downlink data source is the tunnel of the local access gateway and the core network data.

Regardless of where the downlink data originates, the local IP access tunnel between the wireless side network element and the local access gateway is determined to need to be updated, so that it can be directly applied when the local IP accesses the downlink data.

Step 809: The core network mobility management entity brings the downlink tunnel identifier allocated by the radio side network element to the local access gateway by modifying the bearer request message.

Step 810: The local access gateway replies with a modify bearer response message.

Step 811: The wireless side network element learns the uplink tunnel identifier of the local IP access in step 805, and the local access gateway obtains the downlink tunnel identifier allocated by the radio side network element in step 809, and the local IP access uplink and downlink data can be normally transmitted.

Step 812: The core network mobility management entity optionally sends the downlink tunnel identifier allocated by the radio side network element to the serving gateway by modifying the bearer request message according to the judgment result of step 808. An optional update to the forward tunnel. If the downlink data is only from the core network, the core network mobility management entity initiates a delete session request, and deletes the local access gateway information saved by the S-GW.

Step 813: The serving gateway replies to modify the bearer response message. Step 814: After receiving the downlink tunnel identifier allocated by the radio side network element, the serving gateway sends the buffered downlink data to the user terminal, and the local IP access uplink data of the user terminal is sent in step 811, and no longer passes through the serving gateway.

In the actual application, the establishment of the local IP access direct tunnel and the establishment of the local IP access forwarding tunnel are not in the order, and the steps 809 and 812 of the present invention can be performed in parallel.

Services supporting the S4 interface The GPRS support node is equivalent to the mobility management entity in the application. The specific implementation details are not described here. It can be understood by referring to the steps shown in FIG. 7 and FIG. 8.

For the GPRS system, as shown in FIG. 8, the serving GPRS support node supporting the Gn interface can automatically determine the data source as the buffer point of the downlink data. Since the tunnel update of the downlink cache data is completed inside the SGSN, the tunnel update is performed. The optimization method has no obvious advantages in this scenario and will not be described here.

FIG. 9 is a flow chart of the local IP access tunnel update of the core network of the LTE system according to the fourth embodiment of the present invention. As shown in FIG. 9, the specific steps of the local IP access tunnel update of the LTE system core network are as follows:

Step 901: When the user terminal is in an idle state, the core network mobility management entity transfers the downlink tunnel accessed by the local IP to the core network side, and when the local access gateway receives the downlink data, sends the data to the serving gateway for caching. If the downlink data is received from the core network access gateway, the data can also be buffered to the same data cache unit.

Step 902: After receiving the downlink data, the serving gateway notifies the core network mobility management entity by using the downlink data notification message.

Step 903: The core network mobility management entity triggers paging in the wireless side network element in the coverage area of the user terminal registration area.

Step 904: The user terminal receives the paging message and responds to the paging by initiating the service request message. Step 905: The core network mobility management entity establishes an air interface bearer for the user terminal, initially. In the following setup request message, all the established uplink tunnel identifiers, security contexts, radio bearer QoS parameters, and the like are sent to the radio side network element.

Step 906: The wireless side network element establishes a wireless bearer with the user terminal according to the indication information of the core network.

Step 907: The radio side network element returns an initial context setup complete message to the core network mobility management entity after the air interface bearer establishment is completed, where the downlink tunnel identifier of the user plane data channel allocated by the radio side network element is carried.

Step 908: If the core network mobility management entity determines that the downlink data of the current user terminal arrives and the user terminal has activated the local IP access function, the core network mobility management unit determines that the wireless side network element needs to be updated to the serving gateway and the wireless Two data tunnels from the side network element to the local access gateway.

Step 909: The core network mobility management entity brings the downlink tunnel identifier and the local access gateway address information allocated by the radio side network element to the serving gateway by modifying the bearer request message. After receiving the downlink tunnel identifier, the serving gateway can open the downlink forwarding tunnel.

Step 910: After receiving the address information of the local access gateway, the serving gateway sends a modify bearer request message to the local access gateway to bring the downlink tunnel identifier assigned by the radio side network element to the local access gateway to open the local IP access downlink data directly. tunnel.

Step 911: The local access gateway replies with a modify bearer response message.

Step 912: The serving gateway replies to the mobility management entity to modify the bearer corresponding message to notify the downlink forwarding tunnel and the direct tunnel to complete the update.

Step 913: The wireless side network element learns the uplink tunnel identifier of the local IP access in step 905, and the local access gateway obtains the downlink tunnel identifier allocated by the radio side network element in step 910, and the local IP access uplink and downlink data can be normally transmitted.

Step 914: The serving gateway receives the downlink tunnel identifier allocated by the radio side network element in step 909. The buffered downlink data is sent to the user terminal, and the local IP access uplink data of the user terminal is sent through step 913, and no longer passes through the serving gateway.

In this embodiment, the local IP access forwarding tunnel is established in step 909, and the local IP access direct tunnel is established after step 910. Therefore, the establishment of the two data tunnels in the scenario exists in this order.

In addition, when the serving gateway receives the downlink data sent from the core network access gateway, the steps described in this embodiment are also performed, and the local IP access downlink data tunnel needs to be established even if there is no local IP access downlink data. It can be directly applied when there is local IP access to downlink data, and will not be described here.

Services supporting the S4 interface The GPRS support node is equivalent in application to the mobility management entity described above.

For the GPRS system, as shown in FIG. 9, since the update of the local IP access forwarding tunnel belongs to the internal operation of the serving GPRS support node, there is no indirect notification mode, and the SGSN can directly initiate an update according to the saved local access gateway address. .

In the foregoing method, the tunnel between the radio side network element and the local access gateway is used for local IP access downlink data transmission; the tunnel between the radio side network element and the data cache unit is used for local IP access. Downstream cache data transfer. The local IP access includes: access of the user terminal to the IP device of the home network or the IP device of the enterprise network, and access of the user terminal to the specific IP network through the home network, the enterprise network, or the macro cellular network.

10 is a schematic structural diagram of a tunnel update system in a communication system supporting local IP access according to the present invention. As shown in FIG. 10, the tunnel update system in the communication system supporting local IP access of the present invention includes a data buffer unit 1001 and a confirmation unit 1002. a first updating unit 1003 and/or a second updating unit 1004, wherein the data buffering unit 1001 is configured to buffer the downlink data; the confirming unit 1002 is located in a mobility management component of the core network, for confirming that the data buffering unit 1001 receives Downlink data of the user terminal and the user terminal has activated local IP access, triggering the first update unit 1003. Alternatively, the second update unit 1004 is triggered if the downlink data is only from the core network, otherwise the first update unit 1003 is triggered. The first update unit 1003 is configured to cache the wireless side network element and the data. The tunnel between the units and the gateway between the wireless side network element and the local access gateway is updated. The mobility management component includes a mobility management entity MME in a long term evolution system or a serving GPRS support node SGSN in a general packet radio service GPRS system. In the present invention, the tunnel between the radio side network element and the local access gateway is used for local IP access downlink data transmission; the tunnel between the radio side network element and the data cache unit is used for local IP access downlink buffer. data transmission.

When the mobility management component is an MME, the data cache unit is located in a service gateway of the core network. In this case, the tunnel update system in the communication system supporting the local IP access of the present invention further includes: a paging unit, located in the MME, configured to initiate paging to the user terminal; and a bearer establishing unit, configured to establish the wireless a radio bearer between the side network element and the user terminal; a first notification unit, located in the radio side network element, configured to correspond to the radio bearer established between the radio side network element and the user terminal Notifying the MME of the identifier of the downlink tunnel; the first update unit includes:

a second establishing subunit, located in the serving gateway, configured to establish a tunnel between the serving gateway and the radio side network element for local IP access downlink buffer data transmission;

a second sending subunit, configured to: when the user terminal pages to a connected state, the local The IP access downlink data is sent to the user terminal through a tunnel established between the local access gateway and the radio side network element.

When the mobility management component is an MME, the data cache unit is located in a serving gateway of the core network. In this case, the tunnel update system in the communication system supporting the local IP access of the present invention further includes: a second notification unit, configured to receive the access gateway address or the access gateway identifier of the downlink data in the downlink data notification message Notifying the MME; a paging unit, located in the MME, configured to initiate paging to the user terminal; a bearer establishing unit, configured to establish a radio bearer between the radio side network element and the user terminal; a first notification unit, located in the radio side network element, configured to notify the MME of an identifier of a downlink tunnel established between the radio side network element and the user terminal; a determining unit, located in the MME Determining, according to the access gateway address of the downlink data or the access gateway identifier, the downlink data source, if the downlink data is only from the core network, triggering the second update unit, otherwise The first update unit is triggered; the first update unit includes: a notification subunit, configured to notify the local access gateway and the service gateway of the identifier of the downlink tunnel; a establishing sub-unit, located in the local access gateway, configured to establish a tunnel between the local access gateway and the radio side network element for local IP access downlink data transmission; a tunnel for establishing a transmission in the service gateway; a first sending subunit, configured to send the local IP access downlink buffer data through a tunnel established between the serving gateway and the radio side network element Providing the user terminal; the second sending subunit, configured to establish, by the user terminal, the downlink data of the local IP access through the local access gateway and the wireless side network element when the user terminal pages to the connection state The tunnel is sent to the user terminal; the second update unit includes: a notification subunit, located in the MME, configured to notify the local access gateway of the identifier of the downlink tunnel; a tunnel for a local IP access downlink data transmission established between the local access gateway and the radio side network element in the local access gateway; a sending subunit, To the user The tunnel established with the radio side network element is sent to the user terminal; the release subunit is located in the MME, and is used to delete the local access gateway information in the serving gateway.

When the mobility management component is an MME, the data cache unit is located in a service gateway of the core network. In this case, the tunnel update system in the communication system supporting the local IP access of the present invention further includes: a paging unit, located in the MME, configured to initiate paging to the user terminal; and a bearer establishing unit, configured to establish the wireless a radio bearer between the side network element and the user terminal; a first notification unit, located in the radio side network element, configured to set a downlink tunnel between the radio side network element and the user terminal The first update unit includes: a first notification subunit, configured to notify the service gateway of the identifier of the downlink tunnel and the local access gateway address; a tunnel for the local IP access downlink buffer data transmission to the wireless side network element, where the first sending subunit is configured to pass the local IP access downlink cache data through the a tunnel established by the first establishing sub-unit is sent to the user terminal, and a second notification sub-unit is located in the serving gateway, and is used to identify the downlink tunnel. Notifying the local access gateway; a second establishing sub-unit, located in the local access gateway, configured to establish a downlink data transmission between the local access gateway and the radio side network element for local IP access And a second sending subunit, configured to send the local IP access downlink data to the user terminal by using a tunnel established by the second establishing subunit when the user terminal pages to a connected state.

When the mobility management component is an SGSN, the data cache unit is located in the SGSN. In this case, the tunnel update system in the communication system supporting the local IP access of the present invention further includes: a paging unit, located in the SGSN, for initiating paging for the user terminal; and a bearer establishing unit, configured to establish the wireless a radio bearer between the side network element and the user terminal; a notification unit, located in the radio side network element, configured to notify the identifier of the downlink tunnel established between the radio side network element and the user terminal The SGSN; the first update unit includes: a first sender a unit, located in the SGSN, configured to directly send the local IP access downlink buffer data to the user terminal according to the downlink tunnel identifier; and notify a subunit, located in the SGSN, to be used in the downlink tunnel Notifying the local access gateway; establishing a subunit, the tunnel for establishing the transmission; the second sending subunit, configured to pass the local IP access downlink data when the user terminal pages to the connected state A tunnel established between the local access gateway and the radio side network element is sent to the user terminal.

In the present invention, the wireless side network element includes a home base station, a macro base station, a home base station gateway, and the like. The local IP access includes: access by the user terminal to the IP device of the home network or the IP device of the enterprise network, and access of the user terminal to the specific IP network through the home network, the enterprise network or the macro cellular network.

It should be understood by those skilled in the art that the tunnel update system in the communication system supporting local IP access shown in FIG. 10 is set to implement the foregoing tunnel update method in the communication system supporting local IP access, in the system shown in FIG. The function of each processing unit can be understood by referring to the description of the method shown in FIG. 6 to FIG. 9. The functions of each processing unit can be implemented by a program running on a processor, or can be realized by a specific logic circuit.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A tunnel update method in a communication system supporting local IP access, characterized in that the method comprises:

2. The method according to claim 1, wherein the mobility management component comprises a mobility management entity MME in a long term evolution system or a serving GPRS support node SGSN in a general packet radio service GPRS system.

The method according to claim 2, wherein, when the mobility management component is an MME, the data cache unit is located in a monthly service gateway of the core network.

The method according to claim 3, wherein the mobility management component initiates a tunnel update, specifically:

Notifying the local access gateway and the serving gateway of the identifier of the downlink tunnel, and updating the tunnel of the local access gateway to the radio side network element for local IP access downlink data transmission, And updating a tunnel of the serving gateway to the radio side network element for local IP access downlink buffer data transmission;

The downlink buffer data of the local IP access is sent to the user terminal through a tunnel of the serving gateway to the local IP access downlink buffer data transmission of the radio side network element; The local IP access downlink data after the user terminal is paged to the connection state is sent to the user terminal by using the local access gateway to the tunnel for the local IP access downlink data transmission of the radio side network element.

Determining, by the MME, the source of the downlink data according to the access gateway address of the downlink data or the identifier of the access gateway, and if the downlink data is from the core network, the MME uses the downlink tunnel Notifying the local access gateway that only the tunnel for the local IP access downlink data transmission between the radio side network element and the local access gateway is updated, and the local access gateway information saved on the serving gateway is deleted. And if the downlink data is from the local access gateway or from both the local access gateway and the core network, the MME notifies the local access gateway and the serving gateway of the identifier of the downlink tunnel; Updating a tunnel between the local access gateway and the radio side network element for local IP access downlink data transmission, and updating a data transmission between the serving gateway and the radio side network element for local IP access downlink cache data transmission Tunnel

The method according to claim 2, wherein, when the mobility management component is an SGSN, the data buffering unit is located in the SGSN.

The method according to claim 7, wherein the mobility management component initiates a tunnel update, specifically:

The SGSN directly sends the local IP access downlink buffer data to the user terminal according to the downlink tunnel identifier, and the SGSN notifies the local access gateway of the identifier of the downlink tunnel, and updates the local Between the access gateway and the wireless side network element for local IP accessing a tunnel for downlink data transmission; the local IP access downlink data after the user terminal pages to the connection state passes through the local access gateway to the wireless side network element for local IP access downlink data transmission The tunnel is sent to the user terminal.

The method according to any one of claims 1 to 8, wherein the wireless side network element comprises a home base station, a macro base station, and a home base station gateway.

The method according to any one of claims 1 to 8, wherein the tunnel between the radio side network element and the local access gateway is used for local IP access downlink data transmission; The tunnel between the side network element and the data buffer unit is used for local IP access downlink buffer data transmission.

The method according to any one of claims 1 to 8, wherein the local IP access comprises: the user terminal accessing the IP device of the home network or the IP device of the enterprise network, and the user terminal passing the home Network, corporate network or macro cellular network access to a specific IP network.

12. A tunnel update system in a communication system supporting local IP access, characterized in that the system comprises a data buffer unit, a confirmation unit, a first update unit and/or a second update unit;

a data buffer unit, configured to cache the downlink data;

a first update unit, configured to update a tunnel between the radio side network element and the data cache unit and between the radio side network element and the local access gateway;

And a second updating unit, configured to update a tunnel between the wireless side network element and the local access gateway, and delete local access gateway information saved on the serving gateway.

The system according to claim 12, wherein the mobility management component comprises a mobility management entity MME in a long term evolution system or a serving GPRS support node SGSN in a general packet radio service GPRS system.

The system according to claim 13, wherein, when the mobility management component is an MME, the data cache unit is located in a serving gateway of the core network.

The system according to claim 14, wherein the system further comprises a paging unit, a bearer establishing unit, and a first notifying unit; wherein:

a first notification unit, located in the radio side network element, configured to notify the MME of an identifier of a downlink tunnel corresponding to the radio bearer established between the radio side network element and the user terminal; The unit further includes a notification subunit, a first setup subunit, a second setup subunit, a first transmit subunit, and a second transmit subunit; wherein:

The system according to claim 14, wherein the system further comprises a second notification unit, a paging unit, a bearer establishing unit, a first notifying unit, and a determining unit; wherein: the second notifying unit is configured to: Notifying the MME of the access gateway address or the access gateway identifier that receives the downlink data in the downlink data notification message;

The first update unit further includes a notification subunit, a first setup subunit, a second setup subunit, a first sending subunit, and a second sending subunit; wherein:

a second sending subunit, configured to send the local IP access downlink data to the tunnel established by the local access gateway and the radio side network element when the user terminal pages to a connected state User terminal The second update unit further includes a notification subunit, a setup subunit, a sending subunit, and a release subunit; wherein:

Establishing a sub-unit, located in the local access gateway, for establishing a tunnel for local IP access downlink data transmission between the local access gateway and the radio side network element;

a sending subunit, configured to send the local IP access downlink data to the user by using a tunnel established between the local access gateway and the radio side network element when the user terminal pages to a connected state Terminal

The first update unit further includes a first notification subunit, a first setup subunit, a first transmission subunit, a second notification subunit, a second setup subunit, and a second transmission subunit; wherein:

a first establishing sub-unit, located in the serving gateway, configured to establish a tunnel to the radio side network element for local IP access downlink buffer data transmission; a first sending subunit, configured to send the local IP access downlink buffer data to the user terminal by using a tunnel established by the first establishing subunit;

a second establishing sub-unit, located in the local access gateway, configured to establish a tunnel for local IP access downlink data transmission between the local access gateway and the radio side network element; , configured to: when the user terminal pages to a connected state, the local

The IP access downlink data is sent to the user terminal through a tunnel established by the second setup subunit.

The system according to claim 13, wherein when the mobility management component is an SGSN, the data buffer unit is located in the SGSN.

The system according to claim 18, wherein the system further comprises a paging unit, a bearer establishing unit, and a notifying unit; wherein:

The first update unit further includes a first sending subunit, a notification subunit, a establishing subunit, and a second sending subunit; wherein:

Establishing a subunit, configured to establish a relationship between the local access gateway and the wireless side network element Accessing the tunnel of downlink data transmission at the local IP;

a second sending subunit, configured to: when the user terminal pages to a connected state, the local

The IP access downlink data is sent to the user terminal through a tunnel established between the local access gateway and the radio side network element.

The system according to any one of claims 12 to 19, wherein the radio side network element comprises a home base station, a macro base station, and a home base station gateway.

The system according to any one of claims 12 to 19, wherein a tunnel between the radio side network element and the local access gateway is used for local IP access downlink data transmission; The tunnel between the side network element and the data buffer unit is used for local IP access downlink buffer data transmission.

The system according to any one of claims 12 to 19, wherein the local IP access comprises: the user terminal accessing the IP device of the home network or the IP device of the enterprise network, and the user terminal passing the home Network, corporate network or macro cellular network access to a specific IP network.