WO2011054264A1 - Method and system for establishing downlink data channels for local internet protocol access - Google Patents

Abstract

A method and system for establishing downlink data channels for local Internet Protocol (IP) access are provided. When a user is using a local IP access function, a mobile management unit of a core network, in the process of activating a radio bearer, directs a radio network element to allocate a downlink forward tunnel identifier for local IP access and a downlink direct tunnel identifier for local IP access. With the method of the present invention, it is realized that a local gateway establishes a downlink data channel for local IP access by using the allocated downlink direct tunnel identifier for local IP access; and a data buffer unit of a core network forwards buffer data to a user by using the allocated downlink forward tunnel identifier for local IP access, and therefore normal transmission of local IP access data is ensured, and function change of a radio network element is avoided.

Description

 Method and system for establishing IP access downlink data channel

 The present invention relates to a Local IP Access (LIPA) technology, and more particularly to a method and system for establishing a local IP access downlink data channel. Background technique

 In order to maintain the competitiveness of the third generation mobile communication system in the field of communication, to provide users with faster, less delayed, more personalized mobile communication services, while reducing operators' operating costs, third-generation partners The Standards Working Group of the 3GPP (3rd Generation Partnership Project) is working on the Evolved Packet System (EPS). Figure 1 is a schematic diagram showing the structure of an existing EPS system. As shown in Figure 1, the entire EPS system is divided into two parts: a wireless access network and a core network.

 The core network includes a Home Subscriber Server (HSS), a Mobility Management Entity (MME), a Serving GPRS Support Node (SGSN), and a Policy Charging Rule Function (PCRF, Policy and Charging). Rule Function), Service Gateway (S-GW, Serving Gateway), Packet Data Gateway (P-GW, PDN Gateway), and Packet Data Network (PDN, Packet Data Network). among them,

The HSS is a permanent storage location for user subscription data, located in the home network to which the user subscribes.

The MME is the location where the subscriber subscription data is stored in the current network, and is responsible for terminal-to-network non-access stratum signaling management, terminal security verification function, terminal mobility management, user idle mode tracking and paging management functions, and Bearer management.

The SGSN is a service support point for GERAN and UTRAN users to access the core network. It is similar in function to the mobility management entity and is responsible for user location update, paging management, and bearer management. S-GW, which is the gateway of the core network to the wireless system, is responsible for the user plane bearer of the terminal to the core network, the data buffer in the terminal idle mode, the function of initiating the service request by the network side, the lawful interception and the packet data routing and forwarding function; The gateway is responsible for counting the situation in which the user terminal uses the wireless network, and generates the CDRs of the terminal using the wireless network, and transmits the CDRs to the charging gateway.

 P-GW, which is the gateway of the evolution system and the external packet data network of the system, is connected to the Internet and the packet data network, and is responsible for the Internet Protocol (IP) address allocation, charging function, and packet filtering of the terminal. , policy control and other functions.

 The PDN is the carrier's IP service network, which provides IP services to users through the carrier's core network.

 The PCRF is a server in the evolution system that provides 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). The radio access network is mainly responsible for transmitting and receiving wireless signals, and is connected to the terminal through the air interface to manage the air. Radio resources, resource scheduling, and access control of the interface.

 The above-mentioned service GPRS support node is an upgraded SGSN, which can support the S4 interface with the serving gateway and communicate with the MME 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 (HeNB, Home eNodeN) is a type of small, low-power base station. It is used as a dedicated resource for some users and deployed in private places such as homes, groups, companies, or schools. , mainly to provide users with higher service rates and reduce the cost of using high-speed services, while making up for existing distributed bees Insufficient coverage of the wireless communication system. The advantages of home base stations are affordability, convenience, low power output, plug and play, broadband access, use of single mode terminals, and more.

 The home base station can be directly connected to the core network, or can be accessed to the core network through the home base station gateway. The main functions of the home base station gateway are: verifying the security of the home base station, processing the registration of the home base station, and the home base station Perform operation and maintenance management, configure and control the home base station according to the operator's requirements, and exchange data between the core network and the home base station. 2a is a schematic diagram of a first implementation manner of a home base station accessing a core network, FIG. 2b is a schematic diagram of a second implementation manner of a home base station accessing a core network, and FIG. 2c is a schematic diagram of a third implementation manner of a home base station accessing a core network. .

 In order to implement local IP access (LIPA, Local IP Access or SIPTO, Selected IP Traffic Offload), the terminal adds local gateways to other IP devices on the home network, IP devices in the enterprise network, or local access to the Internet. Shown in Figures 2a, 2b and 2c. The addition of the local gateway provides strong support for the local IP access technology. The local gateway can be set up with the wireless side network element (as shown in Figure 2a and Figure 2b) or set near the wireless side network element (that is, external), local. The gateway can also be set up with the home base station gateway (as shown in Figure 2c) or near the home base station gateway (ie external). The local gateway may be a local SGW (L-SGW, Local SGW), a local PGW (L-PGW, Local PGW), a local GGSN (L-GGSN, Local GGSN), an external L-GW (Local GW), and the like.

FIG. 3 is a schematic diagram of a data flow path of a local IP access and a traditional core network IP access in a mobile communication network architecture. As shown in FIG. 3, a traditional core network IP access data path and a local can be established for a user supporting local IP access. IP access data path. For local IP access connections, the local IP access data path from the terminal to the wireless side network element to the local gateway (L-SGW, L-PGW, L-GGSN), the data transmission does not go through the core network. In order to implement local access of the terminal to other IP devices or the Internet of the home network, two local IP access data paths may be established, wherein the local IP access data path 1 directly accesses the Internet, also referred to as an Internet LIPA connection. Local IP access data path 2 directly accesses other IP devices on the home network, also known as home network LIPA connections.

 When the user does not receive or send data for local IP access for a long time, the wireless side network element releases the air interface to make the user enter the idle state. At this time, if the user's local IP access downlink data arrives, the local gateway sends the data to the service gateway of the core network for caching, and then the cached data is sent to the user when the user is paged to the connected state. . In this way, the downlink data of the local IP access is guaranteed to be lost, and the user is provided with good service perception. The data transmission path under the specific user state transition is shown in Figure 4. Figure 4 is a schematic diagram of the data transmission path in the case of user state transition.

 For scenario 3 in Figure 4, the core network serving gateway only passes the cached data to the user through the wireless side network element. Therefore, the wireless side network element is a convergence point of downlink data, and the wireless side network element can allocate the same downlink tunnel identifier for the forwarding tunnel and the local IP access direct tunnel, which has no problem in downlink data transmission, but in tunnel management. You need to modify the operation of the wireless side network element. When the forwarding tunnel data is sent and released, if the radio network element deletes the downlink tunnel identifier immediately, and the local IP access direct tunnel may be using it for data transmission, the downlink tunnel identifier deletion operation may cause the data transmission to be interrupted. Therefore, the tunnel management operation of the radio side network element is increased, and the function of the radio side network element is changed. Summary of the invention

 In view of the above, the main purpose of the present invention is to provide a method for establishing a local IP access downlink data channel, which can ensure the normal transmission of local IP access data and avoid the change of the function of the wireless side network element.

 Another object of the present invention is to provide a system for establishing a local IP access downlink data channel, which can ensure normal transmission of local IP access data and avoid changes in functions of the wireless side network element.

In order to achieve the above object, the technical solution of the present invention is achieved as follows: A method for establishing a local IP access downlink data channel includes:

 When the user uses the local IP access function, the core network mobility management unit instructs the wireless side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier during the activation of the wireless bearer;

 The local gateway uses the allocated local IP to access the downlink direct tunnel identifier to send the local IP access downlink data; the core network data buffer unit uses the allocated local IP to access the downlink forwarding tunnel identifier to send the local IP access downlink cache data.

 The core network data buffering unit includes a serving gateway; the method further includes: the core network mobility management unit confirming that the core network data buffering unit receives the downlink data;

 The downlink data received by the core network data buffer unit is:

 In the long term evolution LTE network, the monthly service gateway in the core network receives downlink data from the local gateway; or the service gateway in the core network receives downlink data from the core network gateway.

 The core network mobility management unit includes a mobility management entity MME, or an SGSN supporting an S4 interface;

 The core network mobility management element instructs the radio side network element to allocate a local IP access downlink forwarding tunnel identifier and a local IP access line direct tunnel identifier as:

 After receiving the downlink data, the serving gateway notifies the MME by using a downlink data notification message. The MME carries an initial context setup request message to notify the wireless side network element that there is a local IP access downlink forwarding tunnel and a local IP access downlink direct tunnel. And send it to the wireless side network element; or,

After receiving the downlink data, the serving gateway notifies the SGSN supporting the S4 interface by using the downlink data notification message; the SGSN supporting the S4 interface carries the radio access bearer RAB assignment request message to notify the wireless side network element that the local IP exists. The downlink forwarding tunnel and the local IP access indication of the downlink direct tunnel are accessed and sent to the wireless side network element. The method also includes:

 The wireless side network element notifies the MME of the allocated local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier by using an initial context setup complete message; the MME accesses the downlink direct tunnel by modifying the bearer request message The identifier is transmitted to the local gateway, and the local IP access downlink forwarding tunnel identifier is transmitted to the service gateway; or

 The wireless side network element notifies the allocated local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier to the support S4 interface by using an RAB assignment response message.

The SGSN, the SGSN supporting the S4 interface, transmits the local IP access downlink direct tunnel identifier to the local gateway by modifying the bearer request message, and transmits the local IP access downlink forwarding tunnel identifier to the serving gateway.

 The core network data buffer unit includes an SGSN supporting a Gn interface. The method further includes: the core network mobility management unit confirms that the core network data buffer unit receives downlink data; and the core network data buffer unit receives downlink data. For:

 In the GPRS network, the service GPRS support node SGSN supporting the Gn interface in the core network receives downlink data from the local gateway; or the SGSN in the core network receives downlink data from the core network gateway.

 The core network mobility management unit includes an SGSN supporting a Gn interface;

 The SGSN supporting the Gn interface instructs the radio side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier as:

 The SGSN supporting the Gn interface carries an indication for informing the radio side network element that the local IP access downlink forwarding tunnel and the local IP access downlink direct tunnel are sent in the RAB assignment request message, and sends the indication to the radio side network element.

 The method also includes:

The wireless side network element transmits the allocated local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier to the SGSN through the RAB assignment response message; The SGSN transmits the local IP access downlink direct tunnel identifier to the local gateway by updating the PDP context request message.

 A system for establishing a local IP access downlink data channel, which mainly includes a core network mobility management unit, a wireless side network element, a local gateway, and a core network data buffer unit, where

 The core network mobility management unit is configured to: when the local IP access function is used, instruct the wireless side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier in the process of activating the radio bearer; the local IP to be allocated Accessing the downlink direct tunnel identifier to the local gateway, and transmitting the allocated downlink forwarding tunnel identifier to the data cache unit;

 The wireless side network element is configured to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier according to the indication of the core network mobility management unit, and return the downlink direct tunnel identifier to the core network mobility management unit;

 a local gateway, configured to use the allocated local IP to access the downlink direct tunnel identifier to establish a local IP access downlink data channel, and send the local IP to access the downlink data;

 The core network data buffer unit is configured to access the downlink forwarding tunnel identifier by using the allocated local IP, establish a local IP access downlink forwarding data channel, and send downlink buffer data.

 For the LTE network, the core network data cache unit includes a service gateway, and the core network mobility management unit includes an MME or an SGSN supporting an S4 interface;

 The local gateway is further configured to send downlink data to the serving gateway;

 The serving gateway is configured to receive downlink data, send a downlink data notification to the MME, and use the allocated local IP to access the downlink forwarding tunnel identifier to forward the cached data to the user;

The MME is configured to receive a downlink data notification, and trigger a paging in a radio side network element in a coverage area of the user registration area; in the MME response paging process, if the user uses the local IP access function, the wireless is activated. The bearer process instructs the radio side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier; the assigned local IP access downlink direct tunnel identifier is sent to the local gateway, and the allocated local IP access downlink forwarding tunnel identifier hair Send to the service gateway;

 Alternatively, the SGSN supporting the S4 interface is configured to receive the downlink data notification, and trigger the paging in the wireless side network element in the coverage area of the user registration area; and the SGSN supporting the S4 interface responds to the paging process, if the user uses The local IP access function, in the process of activating the radio bearer, instructs the radio side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier; and sends the allocated local IP access downlink direct tunnel identifier to the local gateway. Sending the assigned local IP access downlink forwarding tunnel identifier to the serving gateway;

 The radio side network element is specifically configured to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier according to the indication of the MME or the SGSN supporting the S4 interface, and return the identifier to the MME or the The SGSN supporting the S4 interface.

 For the GPRS network, the core network data cache unit and the core network mobility management unit include an SGSN supporting a Gn interface;

 The local gateway is further configured to send downlink data to the SGSN that supports the Gn interface. The SGSN that supports the Gn interface is configured to receive downlink data, and trigger paging in the wireless side network element in the coverage area of the user registration area. When the SGSN supporting the Gn interface responds to the paging process, if the user uses the local IP access function, the wireless side network element is instructed to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier in the process of activating the radio bearer. Transmitting the assigned local IP access downlink direct tunnel identifier to the local gateway; using the allocated local IP to access the downlink forwarding tunnel identifier to forward the cached data to the user;

 The radio side network element is specifically configured to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier according to the indication of the SGSN supporting the Gn interface, and return the SGSN to the SGSN supporting the Gn interface.

 The core network gateway in the core network sends downlink data to the serving gateway or SGSN in the core network.

The wireless side network element is a home base station or a macro base station. The wireless side network element further includes a home base station gateway or a security gateway.

 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 by the user terminal to the Internet and the specific network through the home network, the enterprise network, or the macro cellular network.

 As can be seen from the technical solution provided by the present invention, the core network mobility management unit confirms that the core network data buffer unit receives downlink data, and when the user uses the local IP access function, the core network mobility management unit activates the wireless bearer process. The radio side network element is instructed to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier. The method of the present invention realizes that the local gateway accesses the downlink direct tunnel identifier by using the allocated local IP to establish a local IP access downlink data channel, and sends the local IP to access the downlink data; and the core network data buffer unit uses the allocated local IP to access the downlink forwarding tunnel identifier. Establish a local IP access downlink forwarding data channel to forward the cached data. The normal transmission of the local IP access data is ensured, and the function of the wireless side network element is avoided. DRAWINGS

 1 is a schematic structural view of a conventional EPS system;

 2a is a schematic diagram of a first implementation manner in which a home base station accesses a core network;

 2b is a schematic diagram of a second implementation manner in which a home base station accesses a core network;

 2c is a schematic diagram of a third implementation manner in which a home base station accesses a core network;

 3 is a schematic diagram of a data flow path of a local IP access and a traditional core network IP access in an existing mobile communication network architecture;

 Figure 4 is a schematic diagram of a data transmission path in the case of a user state transition;

 5 is a flowchart of a method for establishing a local IP access downlink data channel according to the present invention; FIG. 6a is a schematic structural diagram of a first embodiment of a system for establishing a local IP access downlink data channel according to the present invention;

6b is a group of a second embodiment of a system for establishing a local IP access downlink data channel according to the present invention Schematic diagram of the structure;

 7 is a schematic flowchart of a first embodiment of establishing a local IP access data channel according to the present invention in the LTE system of the present invention;

 Figure 8 is a flow chart showing the first embodiment of the present invention for establishing a local IP access data channel in the GPRS system of the present invention. detailed description

 FIG. 5 is a flowchart of a method for establishing a local IP access downlink data channel according to the present invention. As shown in FIG. 5, the method includes the following steps:

 Step 500: The core network mobility management unit confirms that the core network data buffer unit receives the downlink data.

 The downlink data received by the core network data buffer unit is:

 In the LTE network, the serving gateway in the core network receives downlink data from the local gateway; or the serving gateway in the core network receives downlink data from the core network gateway;

 In the GPRS network, the SGSN in the core network receives downlink data from the local gateway; or, the SGSN in the core network receives downlink data from the core network gateway.

 Step 501: When the user uses the local IP access function, the core network mobility management unit instructs the wireless side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier in the process of activating the radio bearer;

 In this step, when receiving the indication, the wireless side network element learns that there is a local IP access downlink forwarding tunnel and a local IP access downlink direct tunnel, and respectively allocates a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier. .

 The local IP access downlink forwarding tunnel identifier is used by the serving gateway or the Gn interface SGSN to send the buffered local IP access downlink data to the radio side network element; the local IP access downlink direct tunnel identifier is used by the local gateway to send the local IP access downlink data to the wireless Side network element.

Step 502: The local gateway accesses the downlink direct tunnel identifier by using the allocated local IP to send the local The IP access downlink data; the core network data buffer unit uses the allocated local IP to access the downlink forwarding tunnel identifier to send the local IP access downlink cache data.

 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 by the user terminal to the Internet and the specific network through the home network, the enterprise network, or the macro cellular network.

 The system of the present invention further provides a system for establishing a local IP access data channel, which mainly includes a core network mobility management unit, a wireless side network element, a local gateway, and a core network data cache unit, where

 The core network mobility management unit is configured to: when the local IP access function is used, instruct the wireless side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier in the process of activating the radio bearer; the local IP to be allocated Accessing the downlink direct tunnel identifier to the local gateway, and transmitting the allocated downlink forwarding tunnel identifier to the data cache unit;

 The wireless side network element is configured to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier according to the indication of the core network mobility management unit, and return the downlink direct tunnel identifier to the core network mobility management unit;

 a local gateway, configured to use the allocated local IP to access the downlink direct tunnel identifier to establish a local IP access downlink data channel, and send the local IP to access the downlink data;

 The core network data buffer unit is configured to access the downlink forwarding tunnel identifier by using the allocated local IP, establish a local IP access downlink forwarding data channel, and send downlink buffer data.

 The wireless side network element is a home base station or a macro base station, and further includes a home base station gateway or a security gateway.

FIG. 6 is a schematic structural diagram of a first embodiment of a system for establishing a local IP access downlink data channel according to the present invention. As shown in FIG. 6a, for the LTE network, the core network data buffer unit includes a serving gateway and the core network. The mobility management unit includes an MME and an SGSN supporting an S4 interface. The local gateway is further configured to send downlink data to the serving gateway;

 The serving gateway is configured to receive downlink data, send a downlink data notification to the MME, and use the allocated local IP to access the downlink forwarding tunnel identifier to forward the cached data to the user;

 The MME is configured to receive a downlink data notification, and trigger a paging in a radio side network element in a coverage area of the user registration area; in the MME response paging process, if the user uses the local IP access function, the wireless is activated. The bearer process instructs the radio side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier; the assigned local IP access downlink direct tunnel identifier is sent to the local gateway, and the allocated local IP access downlink forwarding tunnel identifier Sent to the service gateway.

 The SGSN supporting the S4 interface is configured to receive the downlink data notification, and trigger the paging in the wireless side network element in the coverage area of the user registration area; and the SGSN supporting the S4 interface responds to the paging process, if the user uses the local The IP access function, in the process of activating the radio bearer, instructs the radio side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier; and the assigned local IP access downlink direct tunnel identifier is sent to the local gateway, and the allocation is performed. The local IP access downlink forwarding tunnel identifier is sent to the serving gateway;

 The radio side network element is specifically configured to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier according to the indication of the MME or the SGSN supporting the S4 interface, and return the identifier to the MME or the The SGSN supporting the S4 interface.

 6b is a schematic structural diagram of a second embodiment of a system for establishing a local IP access downlink data channel according to the present invention. As shown in FIG. 6b, for the GPRS network, the core network data cache unit and the core network mobility management unit further include SGSN supporting Gn interface;

The local gateway is further configured to send downlink data to the SGSN that supports the Gn interface. The SGSN that supports the Gn interface is configured to receive downlink data, and trigger paging in the wireless side network element in the coverage area of the user registration area. When the SGSN supporting the Gn interface responds to the paging process, if the user uses the local IP access function, the wireless is indicated during the activation of the radio bearer. The side network element allocates the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier; sends the allocated local IP access downlink direct tunnel identifier to the local gateway; uses the allocated local IP to access the downlink forwarding tunnel identifier to forward the cache to the user. data;

 The radio side network element is specifically configured to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier according to the indication of the SGSN supporting the Gn interface, and return the SGSN to the SGSN supporting the Gn interface.

 It should be noted that the downlink data may be sent to the serving gateway or the SGSN.

 The method of the present invention will be described in detail below with reference to the embodiments.

 FIG. 7 is a schematic flowchart of a first embodiment of establishing a local IP access data channel according to the present invention in an LTE system according to the present invention. In the first embodiment, the core network mobility management entity is an MME, and the serving gateway is an S-GW. , as shown in Figure 7, includes:

 Step 700: When the MME forwards the downlink tunnel accessed by the local IP to the core network side, when the local gateway receives the downlink data, the data is sent to the S-GW for buffering.

 Step 701: The S-GW sends the downlink data notification message to the MME after receiving the downlink data. Step 702: The MME triggers the paging in the wireless side network element in the coverage area of the user registration area. Step 703: The user receives the paging message. Initiating the service request message to respond to the paging; Step 704: The MME establishes an air interface for the user, and sends all the established uplink tunnel identifier, security context, and radio bearer quality of service (Qos) parameters to the wireless in the initial context setup request message. Side network element. If the user currently uses the local IP access function, the MME adds a special indication to the initial context setup request message to inform the wireless side network element that there is a local IP access downlink forwarding tunnel and a local IP access downlink direct tunnel; otherwise, no special is added. Instruction

Step 705: The wireless side network element establishes a presence with the end user according to the indication information of the core network. Line bearing

 Step 706: After the air interface bearer is established, the radio side network element respectively allocates a downlink tunnel identifier to the local IP access forwarding tunnel and the local IP access direct tunnel according to the special indication of the core network, and allocates the local IP through the initial context establishment completion message. Informing the MME by accessing the downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier;

 Step 707: The MME transmits the downlink direct tunnel identifier of the local IP access to the local gateway by modifying the bearer request message.

 Step 708: The local gateway replies with the tamper-response response message.

 Step 709: The wireless side network element obtains the local IP access uplink direct tunnel identifier through step 704, and the local gateway learns that the local IP accesses the downlink direct tunnel identifier through step 707, so that the local IP access uplink and downlink data can be normally transmitted;

 Step 710: The MME transmits the local IP access downlink forwarding tunnel identifier to the S-GW by modifying the bearer request message.

 Step 711: The S-GW replies to modify the bearer response message.

 Step 712: After receiving the downlink IP address of the local IP, the S-GW sends the buffered downlink data to the user, and the local IP access uplink data of the user is sent through step 709, and no longer passes through the S-GW.

 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 707~709 and 710~712 of the present invention are not limited in sequence.

 In addition, when the S-GW receives the downlink data sent from the core network gateway, the steps described in this embodiment are also performed. Even if there is no local IP access data, the local IP access data channel needs to be established, and when there is a local When IP accesses data, it can be directly applied. The specific implementation is not described here.

For the SGSN supporting the S4 interface, the implementation steps are similar, except that the step 704 identifies the presence of the local IP access downlink forwarding tunnel and the local IP access downlink through the RAB assignment request. The special indication of the direct tunnel informs the wireless side network element; and the wireless side network element accesses the downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier through the radio access bearer (RAB) assignment response message in step 706.艮 Core network.

 8 is a schematic flowchart of a second embodiment of the present invention for establishing a local IP access data channel in the GPRS system of the present invention. Assume that the core network mobility management unit is an SGSN supporting a Gn interface, as shown in FIG.

 Step 800: When the SGSN transfers the downlink tunnel of the local IP access to the core network side when the user is in the idle state, the local gateway sends the data to the SGSN for buffering when receiving the downlink data.

 Step 801: The SGSN triggers paging in the radio side network element in the coverage area of the user registration area. Step 802: The user receives the paging message and responds to the paging by initiating the service request message. Step 803: The SGSN establishes an air interface bearer for the user. The uplink tunnel identifier, the transport layer information, the RAB bearer parameters, and the like of all the established links are sent to the radio side network element in the RAB assignment request message. If the user currently activates the local IP access link (that is, the local access function is used), a special indication is added to the RAB assignment request message to inform the wireless side network element that there is a local IP access downlink forwarding tunnel and a local IP access downlink direct tunnel. . Otherwise, no special indication information needs to be added;

 Step 804: The wireless side network element establishes a wireless bearer with the terminal user according to the indication information of the core network.

 Step 805: After the air interface bearer is established, the radio network element allocates a downlink tunnel identifier for the local IP access downlink forwarding tunnel and the local IP access downlink direct tunnel according to the special indication of the core network, and allocates a response message through the RAB, and allocates the response message. The local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier are transmitted to the SGSN;

Step 806: The SGSN transmits the local IP access downlink direct tunnel identifier to the local gateway by updating the PDP context request message. Step 807: The local gateway replies with the tampering response message.

 Step 808: The wireless side network element obtains the local IP access uplink direct tunnel identifier in step 803, and the local gateway learns that the local IP accesses the downlink direct tunnel identifier through step 806, so that the local IP access uplink and downlink data can be normally transmitted.

 Step 809: After receiving the downlink IP address of the local IP, the SGSN sends the buffered downlink data to the user, and the local IP access uplink data of the user is sent through step 808, and no longer passes through the SGSN.

 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 806-808 and 809 of the present invention are not limited in sequence.

 In addition, when the SGSN receives the downlink data sent from the core network gateway, the steps described in this embodiment are also performed. Even if there is no local IP access data, the local IP access data channel needs to be established, and subsequent local IP access is performed. The data can be directly applied, and the specific implementation will not be described here.

 The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included. Within the scope of protection of the present invention.

Claims

Claim  A method for establishing a local IP access downlink data channel, the method comprising: when the user uses the local IP access function, the core network mobility management unit instructs the wireless side network element to allocate local IP access during the activation of the radio bearer The downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier;  The local gateway uses the allocated local IP to access the downlink direct tunnel identifier to send the local IP access downlink data; the core network data buffer unit uses the allocated local IP to access the downlink forwarding tunnel identifier to send the local IP access downlink cache data.  The method according to claim 1, wherein the core network data buffering unit comprises a serving gateway; the method further comprises: the core network mobility management unit confirming that the core network data buffering unit receives the downlink Data  The downlink data received by the core network data buffer unit is:  In the long term evolution LTE network, the monthly service gateway in the core network receives downlink data from the local gateway; or the service gateway in the core network receives downlink data from the core network gateway.  The method according to claim 2, wherein the core network mobility management unit comprises a mobility management entity MME, or an SGSN supporting an S4 interface;  The core network mobility management element instructs the radio side network element to allocate a local IP access downlink forwarding tunnel identifier and a local IP access line direct tunnel identifier as:  After receiving the downlink data, the serving gateway notifies the MME by using a downlink data notification message. The MME carries an initial context setup request message to notify the wireless side network element that there is a local IP access downlink forwarding tunnel and a local IP access downlink direct tunnel. And send it to the wireless side network element; or, After receiving the downlink data, the serving gateway notifies the SGSN supporting the S4 interface by using a downlink data notification message; the SGSN supporting the S4 interface in the radio access bearer RAB assignment request cancellation The information carries an indication for informing the wireless side network element that the local IP accesses the downlink forwarding tunnel and the local IP to access the downlink direct tunnel, and sends the indication to the wireless side network element.  The method according to claim 3, wherein the method further comprises: the radio side network element accessing the downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier by using the initial context setup complete message Informing the MME that the MME transmits the downlink IP tunnel ID to the local gateway by modifying the bearer request message, and transmits the local IP access downlink forwarding tunnel identifier to the serving gateway; or  The wireless side network element informs the SGSN supporting the S4 interface by the allocated local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier by using the RAB assignment response message; the SGSN supporting the S4 interface changes the bearer request message The local IP access downlink direct tunnel identifier is transmitted to the local gateway, and the local IP access downlink forwarding tunnel identifier is transmitted to the serving gateway.  The method according to claim 1, wherein the core network data buffering unit comprises an SGSN supporting a Gn interface; the method further comprising: the core network mobility management unit confirming a core network data buffering unit Downstream data;  The downlink data received by the core network data buffer unit is:  In the GPRS network, the service GPRS support node SGSN supporting the Gn interface in the core network receives downlink data from the local gateway; or the SGSN in the core network receives downlink data from the core network gateway.  The method according to claim 5, wherein the core network mobility management unit comprises an SGSN supporting a Gn interface;  The SGSN supporting the Gn interface instructs the radio side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier as: The SGSN supporting the Gn interface carries an indication for informing the radio side network element that there is a local IP access downlink forwarding tunnel and a local IP access downlink direct tunnel in the RAB assignment request message, and concurrently Send it to the wireless side network element.  The method according to claim 6, wherein the method further comprises: the radio side network element accessing the downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier by using the RAB assignment response message Transmitted to the SGSN;  The SGSN transmits the local IP access downlink direct tunnel identifier to the local gateway by updating the PDP context request message.  A system for establishing a local IP access downlink data channel, comprising: a core network mobility management unit, a wireless side network element, a local gateway, and a core network data cache unit, wherein  The core network mobility management unit, when used to use the local IP access function, instructs the wireless side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier during the activation of the radio bearer; the allocated local IP access Sending the downlink direct tunnel identifier to the local gateway, and sending the allocated downlink forwarding tunnel identifier to the data cache unit;  The wireless side network element is configured to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier according to the indication of the core network mobility management unit, and return the downlink direct tunnel identifier to the core network mobility management unit;  a local gateway, configured to use the allocated local IP to access the downlink direct tunnel identifier to establish a local IP access downlink data channel, and send the local IP to access the downlink data;  The core network data buffer unit is configured to access the downlink forwarding tunnel identifier by using the allocated local IP, establish a local IP access downlink forwarding data channel, and send downlink buffer data.  The LTE network, the core network data buffering unit includes a serving gateway, and the core network mobility management unit includes an MME or an SGSN supporting an S4 interface.  The local gateway is further configured to send downlink data to the serving gateway; The serving gateway is configured to receive downlink data, and send a downlink data notification to the MME; Forwarding the forwarded tunnel identifier with the allocated local IP to forward the cached data to the user;  The MME is configured to receive a downlink data notification, and trigger a paging in a radio side network element in a coverage area of the user registration area; when the MME responds to the paging process, if the user uses the local IP access function, the wireless is activated. The bearer process instructs the radio side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier; the assigned local IP access downlink direct tunnel identifier is sent to the local gateway, and the allocated local IP access downlink forwarding tunnel identifier Sent to the service gateway;  Alternatively, the SGSN supporting the S4 interface is configured to receive the downlink data notification, and trigger the paging in the wireless side network element in the coverage area of the user registration area; and the SGSN supporting the S4 interface responds to the paging process, if the user uses The IP access function, in the process of activating the radio bearer, instructs the radio side network element to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier; and send the allocated local IP access downlink direct tunnel identifier to the local gateway, The assigned local IP access downlink forwarding tunnel identifier is sent to the serving gateway;  The radio side network element is specifically configured to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier according to the indication of the MME or the SGSN supporting the S4 interface, and return the identifier to the MME or the The SGSN supporting the S4 interface.  10. The system according to claim 8, wherein, for the GPRS network, the core network data buffer unit and the core network mobility management unit comprise an SGSN supporting a Gn interface; The local gateway is further configured to send downlink data to the SGSN that supports the Gn interface. The SGSN that supports the Gn interface is configured to receive downlink data, and trigger paging in the wireless side network element in the coverage area of the user registration area. When the SGSN supporting the Gn interface responds to the paging process, if the user uses the local IP access function, the wireless side network element is instructed to allocate the local IP access downlink forwarding tunnel identifier and the local IP access downlink direct tunnel identifier in the process of activating the radio bearer. Sending the assigned local IP access downlink direct tunnel identifier to the local gateway; The local IP access downlink forwarding tunnel identifier forwards the cached data to the user;  The radio side network element is specifically configured to allocate a local IP access downlink forwarding tunnel identifier and a local IP access downlink direct tunnel identifier according to the indication of the SGSN supporting the Gn interface, and return the SGSN to the SGSN supporting the Gn interface.  The system according to claim 8, wherein the core network gateway in the core network sends downlink data to a serving gateway or an SGSN in the core network.  The system according to any one of claims 8 to 11, wherein the radio side network element is a home base station or a macro base station.  The system according to claim 12, wherein the wireless side network element further comprises a home base station gateway or a security gateway.  The system according to any one of claims 8 to 11, 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 accessing the home network , corporate network or macro cellular network access to the Internet and specific networks.