WO2011047622A1

WO2011047622A1 - Method and system for maintaining local connection information

Info

Publication number: WO2011047622A1
Application number: PCT/CN2010/077915
Authority: WO
Inventors: 梁爽; 王静; 周娜; 霍玉臻; 宗在峰
Original assignee: 中兴通讯股份有限公司
Priority date: 2009-10-23
Filing date: 2010-10-20
Publication date: 2011-04-28
Also published as: CN102045751B; CN102045751A

Abstract

The present invention relates to mobile communication field, and discloses a method and system for maintaining local connection information. The method includes: a mobile management unit judges that the local connection information corresponding to a terminal is valid, wherein the local connection information is saved in the base station which integrates the local access gateway function; said mobile management unit sends a message to said base station, and said message carries the indication information, which indicates the base station to delete the local connection information corresponding to said terminal; said base station receives said message, and deletes the local connection information corresponding to said terminal according to said indication information, and returns the response message to said mobile management unit. The present invention reduces the redundant information of the base station, avoids the waste of the resource of the base station, and prevents the effect on the performance of the base station caused by the overabundant redundant data.

Description

Local connection information maintenance method and system

Technical field

The present invention relates to the field of mobile communications, and in particular, to a method and system for maintaining local connection information.

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 3rd Generation Partnership Project (3GPP) standard working group is working on the Evolved Packet System (EPS). Figure 1 shows the structure of the evolved packet domain system. As shown in Figure 1, the entire EPS system is divided into two parts: the wireless access network and the core network. In the core network, the Home Subscriber Server (HSS), the Mobility Management Entity (MME), and the Serving GPRS Support Node (SGSN) are included in the policy. Policy and Charging Rule Function (PCRF), Serving Gateway (S-GW), Packet Data Gateway (PDN Gateway, P-GW for short), and Packet Data Network (Packet Data Network) , PDN). The following detailed functions are:

The home subscriber server is the permanent storage location of the subscriber's subscription data and is located on the home network to which the subscriber subscribes.

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

The service GPRS support node 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.

The service gateway is the gateway from the core network to the wireless system, and is responsible for the user of the terminal to the core network. The data cache in the idle mode of the terminal, the function of initiating the service request on the network side, the lawful interception and the packet data routing and forwarding function; the service 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 Give the billing gateway.

The packet data gateway is a gateway of the evolved system and the external packet data network of the system. It 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 packet data network is the operator's IP service network, which provides IP services to users through the carrier'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 E-UTRAN NodeB (eNB) and a 3G radio network controller (RNC). It is mainly responsible for transmitting and receiving wireless signals, and is connected through the air interface and the terminal. Radio resources, resource scheduling, and access control over the air interface.

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 (Gateway GPRS Support Node, GGSN) through the Gn interface to directly access the packet data network.

A Home NodeB (HNB for short) or an evolved Home eNodeN (HeNB for short) is a small, low-power base station that is deployed as a dedicated resource for certain users in a home, group, company, or school. The use of private places is mainly to provide users with higher service rates and lower the cost of using high-speed services, while making up for the lack of coverage of existing distributed cellular wireless communication systems. 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 applied to the third generation (3 Generation, 3G) or long-term evolution (Long Term Evolution, LTE) in mobile communication networks. In order to facilitate management of the home base station, a new network element, that is, a home base station gateway, is introduced in the network. The main functions performed by the home base station gateway are: verifying the security of the home base station, performing maintenance and management on the operation of the home base station, configuring and controlling the home base station according to the operator's requirements, and exchanging data information of the core network and the home base station. 2 is a 3G home base station network architecture diagram. The 3G home base station is connected to the home base station gateway through a newly defined Iuh interface, and the home base station gateway provides IuPS and IuCs interfaces to the core network packet domain and the circuit domain. For a 3G network, the home base station gateway must be deployed to shield the impact on the terminal and the network side after the introduction of the home base station. For the LTE network, the home base station gateway can be deployed. Therefore, the LTE home base station and the core network are connected in two ways. One is that the home base station and the core network element are directly connected, and the other is the home base station through the gateway and the core network. The elements are connected, as shown in Figures 3 and 4. In the scenario of the home base station gateway shown in FIG. 4, the home base station gateway may not integrate the user plane function, and the user plane is directly established between the home base station and the core network user plane gateway, so that the user plane is flattened and the data transmission delay is reduced. , as shown in Figure 5.

In addition to supporting access through the mobile core network, the home base station can also support local IP access functions. Under the condition that the home base station has local IP access capability and the user subscribes to allow local IP access, the user can implement the user to the home network. Local access to IP devices or the Internet. The local access function can implement the offloading of Internet data services, including providing address allocation, charging, packet filtering, policy control data offloading, and NAS/Radio Access Network Application Part (RANAP) messages. Functions such as resolution, network address translation (NAT), local IP access policy routing, and execution reduce core network load, and access to home network devices can be forwarded without passing through the core network. Data transmission is convenient and efficient. The local IP access function can also be used on the macro cell. The main purpose is similar to that of the home base station, and more is applied to the scenario where the local IP accesses the Internet, in order to reduce the core network load. Figure 6 and Figure 7 show the architecture for implementing the above-mentioned local access function. The main difference is whether there is a home base station gateway. As a logical unit module, the local access gateway is recommended to be deployed in conjunction with an existing home base station or base station during actual deployment. For the macrocell to implement the local access architecture, the radio access gateway proposes to deploy it in conjunction with the base station, which can be implemented by the architecture of FIG.

In order to simplify the network structure and interface information, mobile management unit and local access under this architecture There is no direct interface between the gateways, and some necessary information is needed to establish a local connection to the local access gateway. Since the local access gateway is jointly deployed with the base station or the home base station, the information can be transmitted to the local access gateway through an interface between the mobility management unit and the base station or the home base station.

For a base station or a home base station that does not have an integrated local access gateway function, if the signaling connection between the terminal and the network (including the base station or the home base station, the mobility management unit) is disconnected, that is, the UE enters an idle state, the base station or the home The base station does not retain information about the UE. However, the base station or the home base station integrated with the local access gateway function needs to integrate the local access gateway function to the base station or the home base station to enter the idle state in order to ensure that the idle state UE can quickly restore the local connection after restoring the signaling connection. At the time, you can still maintain some necessary local connection information. However, considering that the mobile of the idle state UE may cause the service range to leave the local access gateway, the subsequent local connection information is no longer needed even if the UE recovers the signaling connection, which may result in the base station integrated with the local access gateway function. Excessive invalid data affects base station performance. Summary of the invention

The technical problem to be solved by the present invention is to provide a method and system for maintaining local connection information, so as to effectively clean up invalid local connection information in a base station and improve base station performance.

In order to solve the above problems, the present invention provides a method for maintaining local connection information, and the method includes:

The mobility management unit determines that the local connection information corresponding to the terminal saved by the base station integrated with the local access gateway function is invalid;

The mobility management unit sends a message to the base station, where the message carries indication information indicating that the base station deletes local connection information corresponding to the terminal;

Receiving, by the base station, the message, deleting local connection information corresponding to the terminal according to the indication information, and returning a response message to the mobility management unit.

In the step of determining, the scenario in which the mobility management unit determines that the local connection information of the terminal is invalid includes the terminal deregistering, or the mobility management unit or the base station corresponding to the local connection of the terminal changes. The scenario in which the mobility management unit or the base station corresponding to the local connection of the terminal is changed includes the terminal initiating a location update request, the terminal initiating a service request, or the base station initiating a handover.

In the step of the mobile management unit sending a message to the base station, when there is no logical association between the mobility management unit and the base station, the message further carries the user identifier of the terminal; In the step of deleting the local connection information corresponding to the terminal according to the indication information, the base station deletes the local connection information according to the indication information and the user identifier.

In the step of determining, the scenario in which the mobility management unit determines that the local connection information of the terminal is invalid includes a closed subscriber group (CSG) timeout to which the base station to which the terminal establishes a local connection belongs.

In a long term evolution access system, the base station refers to a Home evolved base station (HeNB) or an evolved base station (eNB), the mobility management unit refers to a mobility management entity (MME); in a universal terrestrial radio access network (UTRAN) or In the GSM/EDGE wireless communication network (GERAN), the base station refers to a home base station or a radio network controller (RNC), and the mobility management unit is a serving GPRS support node (SGSN).

The base station integrates a local access gateway function, and the mobile management unit sends a message to the base station to send to a local access gateway function, or the local access gateway learns the message content by monitoring the mobile management unit to send a message to the base station. ;

In the step of deleting the local connection information corresponding to the terminal according to the indication information, the local access gateway receives the indication information to delete the local connection information corresponding to the terminal.

In order to solve the above problem, the present invention also provides a method for maintaining local connection information, and the method includes:

The mobility management unit determines that the CSG timeout to which the base station to which the terminal establishes the local connection belongs;

The mobility management unit sends a message to the base station, where the message carries the indication information of the CSG timeout to which the base station to which the terminal establishes the local connection belongs;

In a long term evolution access system, the base station refers to a Home evolved base station (HeNB) or an evolved base station (eNB), the mobility management unit refers to a mobility management entity (MME); in a universal terrestrial radio access network (UTRAN) or In the GSM/EDGE wireless communication network (GERAN), the base station refers to the family a base station or a radio network controller (RNC), the mobility management unit being a serving GPRS support node (SGSN);

The local access gateway function is integrated on the base station, and the step of deleting the local connection information corresponding to the terminal according to the indication information, the local access gateway receiving the indication information, deleting the terminal corresponding to the Local connection information.

To solve the above technical problem, the present invention also provides a maintenance system for local connection information, the system comprising a mobility management unit connected through a network and a base station integrated with a function of a local access gateway, wherein:

The mobility management unit is configured to: send a message to the base station when the local connection information corresponding to the terminal saved by the base station is invalid, and the message carries indication information indicating that the base station deletes the local connection information corresponding to the terminal;

The base station is configured to: delete local connection information corresponding to the terminal according to the message. The mobility management unit includes a maintenance management module and a transceiver module that are connected to each other, wherein the maintenance management module is configured to: determine whether the local connection information corresponding to the terminal of the base station savepoint is invalid, and notify the transceiver module when the failure is determined; The transceiver module is configured to: send a message to the base station, and receive a response message of the base station, if the failure notification of the maintenance management module is received, the message sent to the base station carries the indication information; When there is no logical association between the mobility management unit and the base station, the message sent to the base station further carries the user identifier of the terminal;

The base station includes a transceiver module and an information maintenance module that are connected to each other, where

The transceiver module of the base station is configured to: receive a message sent by the mobility management unit, and send a response message to the mobility management unit, and notify the information maintenance module when the received message carries the indication information; The information maintenance module is configured to: delete the corresponding local connection information according to the indication information or according to the indication information and the user identifier.

The transceiver module and the information maintenance module of the base station are located in a local access gateway integrated in the base station, and the local access gateway is configured to: delete the local connection information corresponding to the terminal according to the message; The local access gateway is further configured to: listen to the mobile management unit to send a message to the base station to learn the content of the message.

The maintenance management module of the mobility management unit is configured to: determine that the local connection information of the terminal is invalid, that the terminal is deregistered, or that the mobility management unit or the base station corresponding to the local connection of the terminal changes.

The scenario in which the mobility management unit or the base station corresponding to the local connection of the terminal is changed includes the terminal initiating a location update request, the terminal initiating a service request, or the base station initiating a handover.

The maintenance management module of the mobility management unit is configured to: determine that the local connection information of the terminal is invalid, including a CSG timeout to which the base station to which the terminal establishes a local connection belongs.

The base station is configured to: delete, by the local access gateway, the local connection information corresponding to the terminal according to the indication information.

The mobility management unit is configured to: send a message to the base station when the CSG timeout to which the base station to which the local connection is established is determined, where the message carries the indication information of the CSG timeout to which the terminal establishes the locally connected base station;

The base station is configured to: delete the local connection information corresponding to the terminal according to the indication information in the received message, and return a response message to the mobility management unit.

In a long term evolution access system, the base station refers to a Home evolved base station (HeNB) or an evolved base station (eNB), the mobility management unit refers to a mobility management entity (MME); in a universal terrestrial radio access network (UTRAN) or In the GSM/EDGE wireless communication network (GERAN), the base station refers to the family A base station or a radio network controller (RNC), the mobility management unit being a Serving GPRS Support Node (SGSN).

The local access gateway is integrated in the base station, and is configured to: delete, by the local access gateway, the local connection information corresponding to the terminal according to the indication information;

The local access gateway is further configured to: listen to the mobile management unit to send a message to the base station to learn the content of the message.

In the method and system for maintaining the local connection information of the present invention, the mobility management unit determines whether the local connection information saved by the base station is invalid according to different scenarios, and when the failure is determined, notifying the base station to delete the corresponding local connection information, and ensuring integration of the local access gateway function. The base station can clean out invalid local connection information, thereby reducing redundant information of the base station, avoiding waste of base station resources, and preventing excessive redundant data from affecting the performance of the base station.

BRIEF abstract

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

2 is a schematic diagram of a 3G home base station network architecture;

3 is a schematic diagram of a network architecture of an LTE home base station;

4 is a schematic diagram of a network architecture of an LTE home base station;

FIG. 5 is a third schematic diagram of an LTE home base station network architecture;

6 is a schematic diagram of a network architecture for implementing local access;

Figure 7 is a second schematic diagram of a network architecture for implementing local access;

FIG. 8 is a flowchart of the first embodiment of the present invention, when the UE is in an idle state, and the mobility management unit cancels the terminal, and notifies the base station to release the local access information;

9 is a flowchart of a second embodiment of the present invention, in which a UE initiates a location update request, and the mobility management unit notifies a base station to release local access information;

10 is a flowchart of a third embodiment of the present invention, in which a UE initiates a location update request, and the mobility management unit notifies a base station to release local access information;

11 is a fourth embodiment of the present invention, a UE initiates a service request, and a mobility management unit notifies a base station a flow chart for releasing local access information;

12 is a flowchart of a fifth embodiment of the present invention, in which a mobility management unit notifies a base station to release local access information during handover;

FIG. 13 is a flowchart of informing the base station to release local access information when the terminal establishes a CSG timeout to which the base station to which the local connection belongs, according to Embodiment 6 of the present invention.

Preferred embodiment of the invention

The main idea of the method and system for maintaining the local connection information of the present invention is: when the mobile management unit determines that the local connection information corresponding to the terminal saved by the base station is invalid, notifying the base station that integrates the local access gateway function to delete the corresponding local connection information, and ensuring integration The base station functioning with the local access gateway can clean up the invalid local connection information and prevent the influence of excessive redundant data on the performance of the base station.

The invention provides a method for maintaining local connection information, including:

A. The mobility management unit determines that the local connection information corresponding to the terminal saved by the base station integrated with the local access gateway function is invalid.

In step A, the scenario in which the mobility management unit determines that the local connection information of the terminal is invalid includes that the terminal is logged off and the mobile management unit or the base station corresponding to the local connection of the terminal changes, or the terminal establishes a local connection. The CSG to which the base station belongs has timed out.

The mobile management unit sends a message to the base station, where the indication information indicating that the base station deletes the local connection information corresponding to the terminal is carried;

C. The base station receives the message, deletes local connection information corresponding to the terminal according to the indication information, and returns a response message to the mobility management unit.

In step B, when there is no logical association between the mobility management unit and the base station, the message further carries the user identifier of the terminal; in step C, the base station according to the indication information And the user identifier deletes the local connection information.

The present invention also provides a method for maintaining local connection information, including: A. The mobility management unit determines that the CSG of the base station to which the terminal establishes the local connection belongs timeout;

B. The mobility management unit sends a message to the base station, where the carrying terminal establishes indication information of a CSG timeout to which the locally connected base station belongs;

In the above two methods, the base station/home base station can judge the local connection failure according to the failure indication of the mobility management unit, or can judge the local connection failure by using the CSG timeout indication and the terminal has established a local connection.

The base station referred to in the present invention refers to a base station or a home base station integrated with a local access gateway function. Specifically, the present invention is applicable to Long Term Evolution (LTE) access or Universal Terrestrial Radio Access Network (UTRAN)/GSM/EDGE RadioAccess Network (GERAN). Into the situation. In LTE, the base station refers to a Home evolved base station (HeNB) or an evolved base station (eNB), the mobility management unit refers to a mobility management entity (MME); in a universal terrestrial radio access network (UTRAN) or GSM/EDGE wireless In the communication network (GERAN), the base station refers to a home base station (HNB) or a radio network controller (RNC), and the mobility management unit is a serving GPRS support node (SGSN).

The present invention is directed to a scenario in which the base station and the local access gateway are combined. In the following embodiments, the mobile management unit sends the base station to the context release request, which can also be regarded as being sent to the local access gateway. The message can complete the function, and does not limit the type of message sent and the protocol used to send the message.

The specific implementation process of the method of the present invention in various scenarios will be described in detail below with reference to the accompanying drawings:

Application example one

8 is an implementation manner in which the mobility management unit logs out the terminal and notifies the local access gateway to release local access information when the UE is in an idle state.

Step 801: The local connection gateway function integrated in the UE and the base station has established a local connection; Step 802, because the subscription data changes, or runs and maintains (Operation and Maintenance, abbreviated as O&M) The home location register of the system notifies that the UE needs to be logged off; Step 803, the mobility management unit determines that the UE needs to be logged off implicitly;

The condition for determining the logout may be that the notification message of step 802 is received, and the UE is implicitly logged out according to the reason of the notification. Alternatively, if step 802 is not performed, the mobility management unit may determine that the UE is implicitly logged out based on the locally saved UE reachability timer or implicit logoff timer timeout.

Step 804 805, the mobility management unit determines that the UE establishes a local connection according to the information in the context of the UE, and the mobility management unit notifies the base station to delete the local connection context of the UE.

In the present invention, the local access gateway function is integrated on the base station, and there is no direct interface between the mobile management unit, so the local connection information of the local access gateway function needs to be used by the interface between the mobility management unit and the base station using the S1AP or RANAP protocol. Release.

If there is a logical association associated with the UE between the mobility management unit and the base station, the mobility management unit sends a UE context release request, which carries an indication to release the local connection information. After receiving the message, the base station notifies the internal local access gateway function module according to the indication, and deletes the context of the local connection of the UE. Thereafter, the base station returns a UE context release response to the mobility management unit. After the process ends, the UE-related logical association between the base station and the mobility management unit is deleted. The above indication can be made by using the existing logout reason value, or by extending the cause value, that is, setting a new cause value, or by adding a message unit.

If there is no logical association associated with the UE between the mobility management unit and the base station, the mobility management unit sends a UE context release request, which carries an indication to release the local connection information, and a user identifier of the UE. After receiving the message, the base station notifies the internal local access gateway module according to the indication and the user identifier of the UE, and deletes the context of the local connection of the UE. Thereafter, the base station sends a UE context release response to the mobility management unit, where the user identifier of the UE is carried.

The user identity of the UE is allocated by the mobility management unit. For LTE access, the UE user identity is GUTI. For GERAN/UTRAN access, the UE user identity is P-TMSL.

Step 806: If the UE also has a bearer of the core network, the mobility management unit also needs to notify the core network gateway to delete the core network.

This process is well known to those skilled in the art and will not be described here. Application Example 2 FIG. 9 is a first implementation manner in which the UE initiates a location update request, and the mobility management unit notifies the local access gateway to release the local access information.

In step 901, the UE establishes a local connection with the local access gateway function integrated in the base station. Step 902: The UE initiates a location update request to the mobility management unit by using the base station, where the request carries the user identifier of the UE.

Step 903: The mobility management unit finds the source mobility management unit according to the user identifier of the UE, and sends a context request message to perform a context acquisition process.

Step 904: The source mobility management unit determines that the local connection established before the release is required according to the change of the mobility management unit.

Step 905: The source mobility management unit sends the mobility management and bearer information of the user to the mobility management unit, where the bearer information does not include local connection information of the UE.

Step 906: After receiving the corresponding information, the mobility management unit confirms the context request. Step 907 908, the source mobility management unit determines that the UE establishes a local connection according to the information in the context of the UE, and the source mobility management unit notifies the source base station to delete the local connection context of the UE.

If there is a logical association associated with the UE between the source mobility management unit and the source base station, the source mobility management unit sends a UE context release request carrying an indication to release the local connection information. After receiving the message, the source base station notifies the internal local access gateway module according to the indication, and deletes the context of the UE local connection. Thereafter, the source base station returns a UE context release response to the source mobility management unit. After the process ends, the UE-related logical association between the source base station and the source mobility management unit is deleted. The above indication can use the existing logout reason value, or by extending the cause value, that is, setting a new cause value, or by adding a message unit.

If there is no logical association associated with the UE between the source mobility management unit and the source base station, the source mobility management unit sends a UE context release request carrying an indication of releasing the local connection information and a user identity of the UE. After receiving the message, the source base station notifies the internal access gateway module according to the indication and the user identifier of the UE, and deletes the context of the local connection of the UE. Then, the source base station sends a UE context release response to the source mobility management unit, where the user identifier of the UE is carried.

Steps 905 to 906 and step 907 908 do not have a strict order relationship. Step 909, performing a subsequent location update process. This process is well known to those skilled in the art and will not be described here.

Application example three

FIG. 10 is a second implementation manner in which the UE initiates a location update request, and the mobility management unit notifies the local access gateway to release the local access information.

Step 1001: The UE and the local access gateway function integrated in the base station have established a local connection. Step 1002: The UE initiates a location update request by the base station to the mobility management unit, where the request carries the user identifier of the UE.

Step 1003: The mobility management unit determines that the previously established local connection needs to be released according to the change of the access base station.

In step 1004 1005, the mobility management unit determines that the UE establishes a local connection according to the information in the context of the UE, and the mobility management unit notifies the source base station to delete the local connection context of the UE.

If there is a logical association associated with the UE between the mobility management unit and the source base station, the mobility management unit sends a UE context release request carrying an indication to release the local connection information. After receiving the message, the source base station notifies the internal local access gateway module according to the indication, and deletes the context of the UE local connection. Thereafter, the source base station returns a UE context release response to the mobility management unit. After the process ends, the UE-related logical association between the source base station and the mobility management unit is deleted. The above indication can be made by using the existing reason for cancellation, or by extending the reason, that is, setting a new cause value, or by adding a message unit.

If there is no logical association associated with the UE between the mobility management unit and the source base station, the mobility management unit sends a UE context release request carrying an indication of releasing the local connection information and a user identity of the UE. After receiving the message, the source base station notifies the local access gateway module of the UE to delete the context of the local connection of the UE according to the indication and the user identifier of the UE. Then, the source base station sends a UE context deletion response to the mobility management unit, where the user identifier of the UE is carried.

Step 1006, performing a subsequent location update process. If the mobility management unit establishes a radio side bearer for the terminal during the location update process, it does not include the bearer context of the local connection. This process is well known to those skilled in the art and is not mentioned here. Application example four

11 is an embodiment in which a UE initiates a service request, and the mobility management unit notifies the local access gateway to release local access information.

Step 1101: The UE and the local access gateway function integrated in the base station have established a local connection. Step 1102: The UE initiates a service request by the base station to the mobility management unit, and the user identifier of the UE is carried in the request.

Step 1103: The mobility management unit determines that the previously established local connection needs to be released according to the change of the access base station.

In step 1104 1105, the mobility management unit determines that the UE establishes a local connection according to the information in the context of the UE, and the mobility management unit notifies the source base station to delete the local connection context of the UE.

If there is a logical association associated with the UE between the mobility management unit and the source base station, the mobility management unit sends a UE context release request carrying an indication to release the local connection information. After receiving the message, the source base station notifies the internal local access gateway module according to the indication, and deletes the context of the local connection of the UE. Thereafter, the source base station returns a UE context release response to the mobility management unit. After the process ends, the UE-related logical association between the source base station and the mobility management unit is deleted. The above indication can be made by using the existing logout reason value, or by extending the cause value, that is, setting a new cause value, or by adding a message unit.

If there is no logical association associated with the UE between the mobility management unit and the source base station, the mobility management unit sends a UE context release request carrying an indication of releasing the local connection information and a user identity of the UE. After receiving the message, the source base station notifies the local access gateway module according to the indication and the user identifier of the UE, and deletes the context of the local connection of the UE. Then, the source base station sends a UE context release response to the mobility management unit, where the user identifier of the UE is carried.

Step 1106, executing a subsequent service request process, at. This process is well known to those skilled in the art and will not be described here.

The above application core network gateways in examples one to four refer to the core network

GGSN/SGW/PGW, the network element is not related to the present invention, and is not limited thereto.

Application example five 12 is an implementation manner in which a base station initiates a handover request, and the mobility management unit notifies the local access gateway to release local access information.

Step 1201: The local access gateway function integrated in the UE and the base station has established a local connection. Step 1202: The source base station determines to initiate a handover procedure according to the measurement parameter of the radio side. The source base station sends a handover request to the source mobility management unit, where the source base station needs to send information to the target base station, and the target base station identifier.

Step 1203: The source mobility management unit determines that the previously established local connection needs to be released according to the change of the access base station.

If the source mobility management unit finds that the target base station cannot be connected, the source mobility management unit selects a new mobility management unit according to the target base station information, otherwise the target mobility management unit and the source mobility management unit in the figure are one network element, Perform the subsequent step 1204. The context information and bearer information of the UE are included in the UE. The bearer information does not include bearer information related to the local connection.

Step 1205: The target mobility management unit sends a handover request to the target base station.

Step 1206, performing a subsequent process of switching.

Step 1207 1208, after the handover is completed, the mobility management unit notifies the source base station to delete the local connection context of the UE.

If there is a logical association associated with the UE between the mobility management unit and the source base station, the mobility management unit sends a UE context release request carrying an indication to release the local connection information. After receiving the message, the source base station notifies the internal local access gateway module according to the indication, and deletes the context of the local connection of the UE. Thereafter, the source base station returns a UE context release response to the mobility management unit. After the process ends, the UE-related logical association between the source base station and the mobility management unit is deleted. The above indication can be made by using the existing reason for cancellation, or by extending the reason, that is, setting a new cause value, or by adding a message unit.

If there is no logical association associated with the UE between the mobility management unit and the source base station, the mobility management unit sends a UE context release request carrying an indication of releasing the local connection information and a user identity of the UE. After receiving the message, the source base station sends a notification according to the indication and the user identifier of the UE. The local access gateway module of the department deletes the context of the local connection of the UE. Afterwards, the source base station sends a UE context release response to the mobility management unit, where the user identifier of the UE is carried.

It should be noted that, the local connection has been established for the local access gateway function that the UE has integrated with the base station, the signaling interaction between the UE and the network ends, and the mobile management unit initiates the release of the radio resource, because the UE initiates the connection again. The local connection information may still be available, that is, the local connection information is not invalid, so there is no need to carry an indication that the local connection information is released in the message released by the radio resource.

Application example six

In the above embodiment, the mobility management unit determines the cause of the local connection failure, which may include the terminal deregistration, or the mobility management unit or the base station corresponding to the local connection of the terminal changes, or the base station that the terminal establishes the local connection belongs to. The CSG timed out. When the above reason is satisfied, the mobility management unit explicitly notifies the base station/home base station whether the information is locally connected. In this embodiment, the mobility management unit notifies the base station/home base station of the CSG timeout information, and the base station determines that the local connection is invalid according to the local connection established by the CSG and the UE establishes a subsequent local access information release procedure.

13 is a flowchart of the sixth embodiment of the present invention, when the terminal establishes a CSG timeout to which the base station to which the local connection belongs, the mobility management unit notifies the base station to release the local access information.

Step 1301: The local access gateway function integrated in the UE and the base station has established a local connection. Step 1302: The subscription location data is sent to the mobility management unit for new subscription data, or through operation and maintenance (Operation). And Maintenance, referred to as Ο&Μ) The system notifies the mobility management entity to change the settings of the terminal.

This step may not need to be performed during this process.

Step 1303, if step 1302 is performed, the mobility management entity determines from the information obtained in step 1301 whether the terminal establishes whether the closed subscriber group (CSG) to which the locally connected base station belongs is timed out.

If step 1302 is not performed, the mobility management entity determines, according to the UE context stored by itself, the CSG timeout to which the terminal establishes the locally connected base station. There are two ways to do this:

Step 1303: The mobility management entity determines that the CSG timeout to which the terminal establishes the locally connected base station belongs, and the terminal establishes a local connection, and the mobility management unit notifies the base station to vote for the local connection context deletion of the UE through steps 1304 to 1305. The method of notification is the same as the method of Embodiment 1, and will not be described here.

Step 1303: The mobility management entity determines that the CSG timeout to which the base station to which the terminal establishes the local connection belongs, and the mobility management unit sends a UE context release request in step 1304, where the mobile terminal establishes a CSG timeout indication information to which the base station to which the local connection belongs. The base station receives the information, and according to the UE has established a local connection, it is determined that the local connection context information of the UE needs to be deleted.

In the mode b, since the local access gateway function is integrated on the base station, and there is no direct interface between the mobile management unit, the local access gateway function needs to be used by using the S1AP or RANAP protocol through the interface between the mobility management unit and the base station. The connection information is released.

If there is a logical association associated with the UE between the mobility management unit and the base station, the mobility management unit sends a UE context release request, where the carrying terminal establishes CSG timeout indication information to which the locally connected base station belongs. After receiving the message, the base station notifies the internal local access gateway function module according to the indication, and deletes the context of the UE local connection. Thereafter, the base station returns a UE context release response to the mobility management unit. After the process ends, the UE-related logical association between the base station and the mobility management unit is deleted. The above indication can be made by using the existing logout reason value, or by extending the value of the reason, that is, setting a new cause value, or by adding a message unit.

If there is no logical association associated with the UE between the mobility management unit and the base station, the mobility management unit sends a UE context release request, where the mobile terminal establishes a CSG timeout indication information to which the locally connected base station belongs, and a user identifier of the UE. After receiving the message, the base station notifies the internal local access gateway module according to the indication and the user identifier of the UE, and deletes the context of the local connection of the UE. Thereafter, the base station transmits a UE context release response to the mobility management unit, which carries the user identity of the UE.

The user identity of the UE is allocated by the mobility management unit. For LTE access, the UE user identity is GUTI, and for GERAN/UTRAN access, the UE user identity is P-TMSI. In the above six application embodiments, the base station/home base station may determine that the local connection is invalid according to the failure indication of the mobility management unit, or may determine that the local connection is invalid through the CSG timeout indication and the terminal has established a local connection. In a system architecture with a home base station gateway, in the above six application examples, all messages transmitted between the home base station and the mobility management unit need to be forwarded by the home base station gateway, and if the information about the local connection is saved on the home base station gateway, After receiving the UE context release request, the context of the local connection needs to be deleted, and the other inventions related to the present invention are not changed, and are not described herein.

In order to implement the local connection information maintenance method of the present invention, the present invention also provides a local connection information maintenance system, which includes a mobility management unit connected through a network and a base station integrated with a local access gateway function, where:

The mobility management unit is configured to: when the local connection information corresponding to the terminal saved by the base station is invalid, send a message to the base station, where the indication information indicating that the base station deletes the local connection information corresponding to the terminal is carried;

Specifically, the mobility management unit includes a maintenance management module and a transceiver module that are connected to each other, wherein the maintenance management module is configured to determine whether the local connection information corresponding to the terminal of the base station savepoint is invalid, and notify the failure to notify the The transceiver module is configured to send a message to the base station and receive a response message of the base station, and if the failure notification of the determining module is received, the message sent to the base station carries the indication information; When there is no logical association between the mobility management unit and the base station, the message sent to the base station further carries the user identifier of the terminal;

The scenario in which the maintenance management module of the mobility management unit determines that the local connection information of the terminal is invalid includes the terminal being deregistered, and the mobility management unit or the base station corresponding to the local connection of the terminal is changed.

a base station, configured with a local access gateway function, configured to delete the terminal corresponding to the message according to the message Local connection information.

Specifically, the base station includes a transceiver module and an information maintenance module that are connected to each other, wherein the transceiver module is configured to receive a message sent by the mobility management unit, send a response message to the mobility management unit, and carry the message in the received message. The information maintenance module is notified when the indication information is received; the information maintenance module deletes the corresponding local connection information according to the indication information or according to the indication information and the user identifier.

Of course, the base station further includes a local access gateway function module to implement a local access gateway function. In order to implement the local connection information maintenance method of the present invention, the present invention also provides a local connection information maintenance system, which includes a mobility management unit connected through a network and a base station integrated with a local access gateway function, where:

The mobility management unit is configured to send a message to the base station when the CSG of the base station to which the terminal establishes the local connection belongs, where the carrying terminal establishes the indication information of the CSG timeout to which the locally connected base station belongs;

The base station is configured to delete the local connection information corresponding to the terminal according to the received indication information in the message, and return a response message to the mobility management unit.

Industrial applicability In the method and system for maintaining the local connection information of the present invention, the mobility management unit determines whether the local connection information saved by the base station is invalid according to different scenarios, and when the failure is determined, notifying the base station to delete the corresponding local connection information, and ensuring integration of the local access gateway function. The base station can clean out invalid local connection information, thereby reducing redundant information of the base station, avoiding waste of base station resources, and preventing excessive redundant data from affecting the performance of the base station.

Claims

Claim

1. A method for maintaining local connection information, the method comprising:

2. The method according to claim 1, wherein, in the step of determining, the scenario in which the mobility management unit determines that the local connection information of the terminal is invalid includes the terminal deregistering, or the local connection of the terminal The corresponding mobility management unit or base station changes.

3. The method according to claim 2, wherein the scenario that causes the mobile management unit or the base station corresponding to the local connection of the terminal to change comprises the terminal initiating a location update request, the terminal initiating a service request, or the base station Initiate a switch.

4. The method according to claim 1, wherein, in the step of the mobile management unit transmitting a message to the base station, when there is no logical association between the mobility management unit and the base station, The message further carries a user identifier of the terminal;

In the step of deleting the local connection information corresponding to the terminal according to the indication information, the base station deletes the local connection information according to the indication information and the user identifier.

The method according to claim 1, wherein, in the step of determining, the scenario in which the mobility management unit determines that the local connection information of the terminal is invalid includes a closed subscriber group to which the terminal establishes a locally connected base station (CSG) timed out.

The method according to any one of claims 1 to 5, wherein, in the long term evolution access system, the base station refers to a home evolved base station (HeNB) or an evolved base station (eNB), and the mobility management unit refers to a mobility management entity (MME); in a universal terrestrial radio access network (UTRAN) or a GSM/EDGE wireless communication network (GERAN), the base station refers to a home base station or a radio network controller (RNC), and the mobility management unit is Serving GPRS Support Node (SGSN).

The method according to any one of claims 1 to 5, wherein

The base station integrates a local access gateway function, and the mobility management unit sends the base station to the base station The message is sent to the local access gateway function; or the local access gateway learns the message content by monitoring the mobile management unit to send a message to the base station;

8. A method for maintaining local connection information, the method comprising:

The mobility management unit determines that the CSG timeout to which the base station to which the terminal establishes the local connection belongs; the mobility management unit sends a message to the base station, where the message carries the indication information of the CSG timeout to which the terminal establishes the locally connected base station;

9. The method according to claim 8, wherein in the long term evolution access system, the base station refers to a home evolved base station (HeNB) or an evolved base station (eNB), and the mobility management unit refers to a mobility management entity ( MME); in a universal terrestrial radio access network (UTRAN) or a GSM/EDGE wireless communication network (GERAN), the base station refers to a home base station or a radio network controller (RNC), and the mobility management unit is a serving GPRS support node ( SGSN);

The local access gateway function is integrated on the base station, in the step of deleting the local connection information corresponding to the terminal according to the indication information, or the local access gateway knows the message by monitoring the mobile management unit to send a message to the base station. And receiving, by the local access gateway, the indication information, and deleting local connection information corresponding to the terminal.

10. A maintenance system for local connection information, the system comprising a mobile management unit connected through a network and a base station integrated with a local access gateway function, wherein:

The mobility management unit is configured to: when it is determined that the local connection information corresponding to the terminal saved by the base station is invalid, send a message to the base station, where the message carries indication information indicating that the base station deletes the local connection information corresponding to the terminal;

The base station is configured to: delete local connection information corresponding to the terminal according to the message.

11. The system of claim 10, wherein

The mobility management unit includes a maintenance management module and a transceiver module that are connected to each other, wherein the maintenance management module is configured to: determine whether the local connection information corresponding to the terminal of the base station savepoint is invalid, and notify the transceiver module when the failure is determined; The transceiver module is configured to: send a message to the base station, and receive a response message of the base station, if the failure notification of the maintenance management module is received, the message sent to the base station carries the indication information; When there is no logical association between the mobility management unit and the base station, the message sent to the base station further carries the user identifier of the terminal;

The transceiver module of the base station is configured to: receive a message sent by the mobility management unit, and send a response message to the mobility management unit, and notify the information maintenance module when the received message carries the indication information;

The information maintenance module is configured to: delete corresponding local connection information according to the indication information or according to the indication information and the user identifier.

12. The system of claim 11 wherein

The transceiver module and the information maintenance module of the base station are located in a local access gateway integrated in the base station, and the local access gateway is configured to: delete the local connection information corresponding to the terminal according to the message;

The system according to claim 11, wherein the maintenance management module of the mobility management unit is configured to: determine that the local connection information of the terminal is invalid, including the terminal logout, or the local connection of the terminal The corresponding mobility management unit or base station changes.

The system according to claim 13, wherein the scenario that causes the mobile management unit or the base station corresponding to the local connection of the terminal to change includes the terminal initiating a location update request, the terminal initiating a service request, or the base station Initiate a switch.

The system according to claim 11, wherein the maintenance management module of the mobility management unit is configured to: determine that the local connection information of the terminal is invalid, and the CSG timeout to which the base station to which the terminal establishes a local connection belongs .

The system according to any one of claims 10 to 15, wherein in the long term evolution access system, the base station refers to a Home evolved base station (HeNB) or an evolved base station (eNB), and the mobility management unit refers to Mobility Management Entity (MME); In the Universal Terrestrial Radio Access Network (UTRAN) or GSM/EDGE Wireless Communication Network (GERAN), the base station refers to a home base station or a wireless network control The controller (RNC), the mobility management unit is a Serving GPRS Support Node (SGSN).

The system according to claim 10, wherein the base station is configured to: delete, by the local access gateway 4, the local connection information corresponding to the terminal according to the indication information.

18. A maintenance system for local connection information, the system comprising a mobile management unit connected through a network and a base station integrated with a local access gateway function, wherein:

The base station is configured to: delete the local connection information corresponding to the terminal according to the indication information received in the message, and return a response message to the mobility management unit.

The system according to claim 18, wherein in the long term evolution access system, the base station refers to a home evolved base station (HeNB) or an evolved base station (eNB), and the mobility management unit refers to a mobility management entity ( MME); in a universal terrestrial radio access network (UTRAN) or a GSM/EDGE wireless communication network (GERAN), the base station refers to a home base station or a radio network controller (RNC), and the mobility management unit is a serving GPRS support node ( SGSN).

The system of claim 18, wherein the base station integrates a local access gateway, and the local access gateway is configured to: delete local connection information corresponding to the terminal according to the indication information;