WO2015100521A1 - Mobility management method, apparatus and system - Google Patents

Abstract

Disclosed are a mobility management method, apparatus and system, which relate to the field of communications and improve switching performance during a mobility management process. The specific solution is: a second access network node receives a switching request sent by a first access network node through an X2 connection when a UE moves from a cell covered by the first access network node to a cell covered by the second access network node; the second access network node sends a switching request acknowledgement to the first access network node through the X2 connection, so that the first access network node executes a switching execution flow with the second access network node; the second access network node determines that it is required to establish a dynamic S1 connection with a first MME; the second access network node establishes the dynamic S1 connection with the first MME; and the second access network node initiates a path switching flow to the first MME through the dynamic S1 connection. The present invention is used during a mobility management process.

Description

 Mobility management method, device and system

 The present invention relates to the field of communications, and in particular, to a mobility management method, apparatus, and system. Background technique

 The 3rd Generation Partnership Project Evolved Packet System (3GPP EPS) consists of Evolved Packet Core (EPC) and Evolved-Universal Terrestrial Radio Access Network (Evolved-Universal Terrestrial Radio Access Network). , E-UTRAN) and user equipment (User Equipment, UE) are composed of three parts. The E-UTRAN may include multiple access network nodes (such as a base station), and the EPC includes a core network node (such as a Mobile Management Entity (MME), a Serving Gateway (SGW)). The access network nodes are connected through an X2 interface, and each access network node can be connected to the core network node through the S1 interface.

 In order to achieve flexible load sharing and good disaster tolerance, EPS introduces 3GPP pool technology. Specifically, a plurality of MME pools may be deployed in the EPC, where each MME pool may include multiple MMEs, and the access network node may be connected to multiple MMEs in the MME pool through the S1 interface. After the 3GPP Pool technology is introduced, the access network node can balance the load according to the weight of each MME in the MME Pool, and select the MME that provides the service for the UE, thereby achieving flexible load sharing and providing the UE with the monthly service. When the MME fails, other MMEs in the MME Pool can continue to provide services for the UE, thereby achieving good disaster recovery. In the EPS that introduces the 3GPP Pool technology, when the UE is in the wireless resource coverage of the MME pool, it is only served by one MME in the MME pool. If the UE roams within the coverage of the radio resource of the current MME Pool, only the X2 interface-based handover is performed, and when the UE leaves the wireless resource coverage of the currently located MME Pool

- 1 - Correction page (Article 91) 5

When the coverage is in the range, the EPS needs to initiate the handover based on the S I interface, that is, the base station needs to reselect the core network node serving the UE.

 In the prior art, at least the following problem exists, because when the UE leaves the radio resource coverage of the currently located MME Pool, the EPS needs to initiate the handover based on the S1 interface, and the base station needs to reselect the core network node that provides the service for the UE, When the UE leaves the radio resource coverage of the currently located MME Pool, the EPS-initiated S1 interface-based handover is more related to the X2 interface-based handover, and the core network has more signaling interactions, so that when the UE leaves the current When the wireless resource coverage of the MME Pool is extended, the switching operation is extended and the complexity is high, resulting in poor handover performance. Summary of the invention

 Embodiments of the present invention provide a mobility management method, apparatus, and system that improve handover performance in a mobility management process.

 In order to achieve the above object, embodiments of the present invention use the following technical solutions:

 A first aspect of the present invention provides a mobility management method, which is applied to an evolved packet system EPS, where the EPS includes at least two mobility management entities MME, at least two access network nodes, and a user equipment UE, where the at least Each of the two access network nodes establishes a static S 1 connection with any one of the at least two MMEs in advance;

The at least two MMEs include a first MME and a second MME, where the first MME is an MME that currently serves the UE, and the second MME establishes the foregoing with a second access network node. a static S 1 connection; and the at least two access network nodes include a first access network node and the second access network node, and the cell currently attached by the UE is covered by the first access network node The cell covered by the first access network node is adjacent to at least one cell covered by the second access network node, and the first access network node and the second access network node are pre-established. X2 connection; when the UE moves from a cell covered by the first access network node to a cell covered by the second access network node, the second access network node receives the first access network a handover request sent by the node through the X2 connection; The second access network node sends a handover request acknowledgement to the first access network node by using the X2 connection, so that the first access network node and the second access network node perform a handover procedure;

 The second access network node determines that a dynamic S 1 connection needs to be established with the first MME;

 And the second access network node establishes the dynamic S1 connection with the first MME; the second access network node sends a path switching procedure to the first MME by using the dynamic S1 connection.

 In combination with the first aspect, in a possible implementation manner, the method further includes:

 The second access network node determines that the dynamic S1 connection is not required to be established with the first MME, where the second access network node and the first MME have established the dynamic S1 connection. ;

 The second access network node sends the path switching procedure to the first MME by using the dynamic S1 connection.

 In combination with the first aspect and the above possible implementations, in another possible implementation,

 The handover request carries the globally unique MME identity GUMMEI of the first MME;

 Before the second access network node determines that a dynamic S 1 connection needs to be established with the first MME, the method further includes:

 Determining, by the second access network node, that the MME currently serving the UE is the first MME according to the GUMME1 carried in the handover request; and determining, by the second access network node, that the An MME establishes a dynamic S1 connection, including:

 The second access network node determines that the first MME is different from the second MME according to the GUMME1 that is carried in the handover request, and determines that the dynamic S1 connection needs to be established with the first MME; Or determining, by the second access network node, that the first MME is different from the second MME according to the GUMME1 carried in the handover request, and determining that the second access network node is the first MME

Correction page (Article 91) If the dynamic SI connection is not established, it is determined that the dynamic S1 connection needs to be established with the first MME;

 The second access network node determines that the dynamic S1 connection is not required to be established with the first MME, and includes:

 Determining, by the second access network node, that the first MME is different from the second MME according to the GUMME1 carried in the handover request, and determining that the second access network node and the first MME have The dynamic S 1 connection is established, and it is determined that the dynamic S 1 connection does not need to be established with the first MME.

 In combination with the first aspect and the above possible implementations, in another possible implementation,

 The establishing, by the second access network node, the dynamic S1 connection with the first MME includes:

 The second access network node sends an S1 connection establishment request to the first MME; and the second access network node receives an S1 connection establishment response sent by the first MME.

 In combination with the first aspect and the above possible implementations, in another possible implementation,

 The first MME selects the original serving gateway SGW to provide a service for the UE in the path switching process initiated by the second access network node to the first MME; the original SGW is currently the UE The SGW that provides the service.

 In combination with the first aspect and the above possible implementations, in another possible implementation,

 After the second access network node initiates a path switching process to the first MME by using the dynamic S1 connection, the method further includes:

 Receiving, by the second access network node, a tracking area update TAU request sent by the UE, where the TAU request is that the UE determines that the current state is an idle state, and determines the received second connection The tracking area identifier broadcast by the ingress network node is not sent after being in the tracking area list of the UE;

 The second access network node sends the TAU request through the static S 1 connection

Correction page (Article 91) And sending to the second MME, so that the second MME 4 initiates a TAU procedure according to the TAU request.

 In combination with the first aspect and the above possible implementations, in another possible implementation,

 After the second access network node initiates a path switching process to the first MME by using the dynamic S1 connection, the method further includes:

 Receiving, by the second access network node, the TAU requesting relocation by the first MME by using the dynamic S1 connection, where the TAU request relocation is performed by the first MME after receiving the UE Determining a TAU request sent by the second access network node, and determining that the tracking area identifier of the cell covered by the second access network node where the UE is located is not in the managed tracking area of the first MME, and then sending The TAU request relocation carries the TAU request;

 The second access network node sends the TAU request carried in the TAU request relocation to the second MME by using the static S1 connection, so that the second MME initiates according to the TAU request. TAU process.

 In combination with the first aspect and the above possible implementations, in another possible implementation,

 The TAU request relocation includes an indication message; or the indication message is carried in a context response sent by the first MME in the TAU procedure to the second MME;

 The indication message is used to indicate that the second MME selects the original SGW to provide a service for the UE in the TAU process. A second aspect of the present invention provides a mobility management method, including:

 The user equipment UE determines that the current state is an idle state;

 Determining, by the UE, that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE; wherein the second access network node is a node currently serving the UE;

 Sending, by the UE, a tracking area update TAU request to the second access network node,

Correction page (Article 91) So that the second access network node initiates a TAU procedure according to the TAU request. A third aspect of the present invention provides a mobility management method, including:

 The second access network node determines that the S1-AP connection for the user equipment UE on the dynamic S1 connection established by the second access network node and the first mobility management entity MME has been released, and the second access The network node releases the dynamic S 1 connection established with the first MME; or

 The second access network node determines that the S1-AP connection of all the UEs on the dynamic S1 connection established by the second access network node and the first MME has been released, and the second connection The ingress node releases the dynamic S 1 connection established with the first MME. A fourth aspect of the present invention provides a second access network node, which is applied to an evolved packet system EPS, where the EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UEs. Each of the at least two access network nodes pre-establishes a static S 1 connection with any one of the at least two MMEs;

 The at least two MMEs include a first MME and a second MME, where the first MME is an MME currently serving the UE, and the second MME is established in advance with the second access network node. The static S 1 is connected; and the at least two access network nodes include a first access network node and the second access network node, and the cell currently attached by the UE is the first access network a cell covered by the node, the cell covered by the first access network node is adjacent to at least one cell covered by the second access network node, and the first access network node and the second access network node Pre-establish an X2 connection;

 a receiving unit, configured to: when the UE moves from a cell covered by the first access network node to a cell covered by the second access network node, receive the first access network node by using the X2 connection The switching request sent;

 a sending unit, configured to send, by using the X2 connection, the first access network node

- 6 - Correction page (Article 91) Switching request confirmation, so that the first access network node and the second access network node perform a handover execution process;

 a determining unit, configured to determine that a dynamic S1 connection needs to be established with the first MME, an establishing unit, configured to establish the dynamic S1 connection with the first MME, and an initiating unit, configured to be established by using the establishing unit The dynamic S1 connection initiates a path switching procedure to the first MME.

 In combination with the fourth aspect, in a possible implementation manner,

 The determining unit is further configured to determine that the dynamic S1 connection is not required to be established with the first MME, where the second access network node and the first MME have established the dynamic S1 connection. ;

 The initiating unit is further configured to initiate the path switching process to the first MME by using the dynamic S1 connection.

 In combination with the fourth aspect and the above possible implementation manners, in another possible implementation manner,

 The handover request carries a globally unique MME identity GUMMEI of the first MME;

 The determining unit is further configured to determine, according to the GUMME1 carried in the handover request, that an MME currently serving the UE is the first, before determining that a dynamic S1 connection needs to be established with the first MME. MME ;

 The determining unit is specifically configured to:

 Determining that the first MME is different from the second MME according to the GUMME1 carried in the handover request, determining that the dynamic S1 connection needs to be established with the first MME; or, according to the handover request, The carried GUMMEI determines that the first MME is different from the second MME, and determines that the second access network node and the first MME do not establish the dynamic S1 connection, and then determines that the need is The first MME establishes the dynamic S 1 connection;

The determining unit is configured to determine, according to the GUMME1 carried in the handover request, that the first MME is different from the second MME, and that the second access network node and the first MME are determined to be If the dynamic S 1 connection is established, the page is corrected (Article 91) It is not necessary to establish the dynamic S 1 connection with the first MME.

 In combination with the fourth aspect and the above possible implementation manners, in another possible implementation manner,

 The establishing unit includes:

 a sending module, configured to send an S1 connection establishment request to the first MME, and a receiving module, configured to receive an S1 connection establishment response sent by the first MME. In combination with the fourth aspect and the above possible implementation manners, in another possible implementation manner,

 The first MME selects an original serving gateway SGW to provide a service for the UE in the path switching procedure initiated by the initiating unit to the first MME; the original SGW is an SGW currently serving the UE .

 In combination with the fourth aspect and the above possible implementation manners, in another possible implementation manner,

 The receiving unit is further configured to: after the initiating unit initiates a path switching procedure to the first MME by using the dynamic S1 connection, receiving a tracking area update TAU request sent by the UE; where the TAU request After the UE determines that the current state is an idle state, and determines that the received tracking area identifier broadcast by the second access network node is not in the tracking area list of the UE;

 The sending unit is further configured to send the TAU request to the second MME by using the static S1 connection, so that the second MME initiates a TAU procedure according to the TAU request.

 In combination with the fourth aspect and the above possible implementation manners, in another possible implementation manner,

 The receiving unit is further configured to: after the initiating unit initiates a path switching procedure to the first MME by using the dynamic S1 connection, receive a TAU request sent by the first MME by using the dynamic S1 connection. Positioning; wherein the TAU request relocation is that the first MME receives a TAU request sent by the UE by using the second access network node, and determines the second access that the UE is located The tracking area identifier of the cell covered by the network node is not in the managed tracking area of the first MME

- 8 - Correction page (Article 91) After being sent, the TAU requests the relocation to carry the TAU request;

 The sending unit is further configured to send, by using the static S1 connection, the TAU request carried in the TAU request relocation to the second MME, so that the second MME initiates a TAU according to the TAU request. Process.

 In combination with the fourth aspect and the above possible implementation manners, in another possible implementation manner,

 The TAU request relocation includes an indication message; or the indication message is carried in a context response sent by the first MME in the TAU procedure to the second MME;

 The indication message is used to indicate that the second MME selects the original SGW to provide a service for the UE in the TAU process. A fifth aspect of the present invention provides a user equipment UE, including:

 a determining unit, configured to determine that the current state is an idle state;

 The determining unit is further configured to determine that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE, where the second access network node is currently providing the UE The node of the service;

 And a sending unit, configured to send a tracking area update TAU request to the second access network node, so that the second access network node initiates a TAU procedure according to the TAU request. A sixth aspect of the present invention provides a second access network node, including:

 a determining unit, configured to determine that the S1-AP connection for the user equipment UE on the dynamic S1 connection established by the second access network node and the first mobility management entity MME has been released, and the second access network The node releases the dynamic S 1 connection established with the first MME; or

 The determining unit is further configured to determine that an S1-AP connection of all UEs on the dynamic S1 connection established by the second access network node and the first MME is released, and the second connection The ingress node releases the dynamic S 1 connection established with the first MME.

- 9 - Correction page (Article 91) 90835

A seventh aspect of the present invention provides a second access network node, which is applied to an evolved packet system EPS, where the EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UEs. Each of the at least two access network nodes pre-establishes a static S 1 connection with any one of the at least two MMEs;

 The at least two MMEs include a first MME and a second MME, where the first MME is an MME that currently serves the UE, and the second MME is established in advance with the second access network node. The static S 1 is connected; and the at least two access network nodes include a first access network node and the second access network node, and the cell currently attached by the UE is the first access network a cell covered by the node, the cell covered by the first access network node is adjacent to at least one cell covered by the second access network node, and the first access network node and the second access network node Pre-establish an X2 connection;

 a receiver, configured to: when the UE moves from a cell covered by the first access network node to a cell covered by the second access network node, receive the first access network node by using the X2 connection The switching request sent;

 a transmitter, configured to send, by using the X2 connection, a handover request acknowledgement to the first access network node, so that the first access network node and the second access network node perform a handover execution process;

 a processor, configured to determine that a dynamic S 1 connection needs to be established with the first MME, establish the dynamic S 1 connection with the first MME, and initiate a path to the first MME by using the dynamic S 1 connection Switch the process.

 In combination with the seventh aspect, in a possible implementation manner,

 The processor is further configured to determine that the dynamic S 1 connection is not required to be established with the first MME, where the second access network node and the first MME have established the dynamic S 1 connection And initiating the path switching procedure to the first MME by using the dynamic S 1 connection.

 In combination with the seventh aspect and the above possible implementations, in another possible implementation

- 10 - Correction page (Article 91) In the formula,

 The handover request carries a globally unique MME identity GUMMEI of the first MME;

 The processor is further configured to determine, according to the GUMMEI carried in the handover request, that an MME currently serving the UE is the first, before determining that a dynamic S1 connection needs to be established with the first MME. MME ;

 The processor is specifically configured to determine that the first MME is different from the second MME according to the GUMME1 that is carried in the handover request, and determine that the dynamic S1 connection needs to be established with the first MME; Or determining, according to the GUMME1 carried in the handover request, that the first MME is different from the second MME, and determining that the second access network node and the first MME do not establish the dynamic S1 Connecting, determining that the dynamic S 1 connection needs to be established with the first MME;

 The processor is configured to determine that the first MME is different from the second MME according to the GUMME1 carried in the handover request, and determine that the second access network node and the first MME are The dynamic S1 connection is established, and it is determined that the dynamic S1 connection does not need to be established with the first MME.

 In combination with the seventh aspect and the above possible implementation manners, in another possible implementation manner,

 The transmitter is further configured to send an S1 connection establishment request to the first MME, where the receiver is further configured to receive an S1 connection establishment response sent by the first MME.

 In combination with the seventh aspect and the above possible implementation manners, in another possible implementation manner,

 The first MME selects an original serving gateway SGW to provide a service for the UE in the path switching procedure initiated by the processor to the first MME; the original SGW is an SGW currently serving the UE .

 In combination with the seventh aspect and the above possible implementation manners, in another possible implementation manner,

 The receiver is further configured to connect to the processor by using the dynamic S1 connection

- 11 - Correction page (Article 91) Receiving, by the first MME, a tracking area update TAU request sent by the UE, where the TAU request is that the UE determines that the current state is an idle state, and determines that the received second The tracking area identifier broadcast by the access network node is not sent after being in the tracking area list of the UE;

 The transmitter is further configured to send the TAU request to the second MME by using the static S1 connection, so that the second MME initiates a TAU procedure according to the TAU request.

 In combination with the seventh aspect and the above possible implementation manners, in another possible implementation manner,

 The receiver is further configured to: after the processor initiates a path switching procedure to the first MME by using the dynamic S1 connection, receive a TAU request sent by the first MME by using the dynamic S1 connection. Positioning; wherein the TAU request relocation is that the first MME receives a TAU request sent by the UE by using the second access network node, and determines the second access that the UE is located After the tracking area identifier of the cell covered by the network node is not sent in the managed tracking area of the first MME, the TAU request relocation carries the TAU request;

 The transmitter is further configured to send, by using the static S1 connection, the TAU request carried in the TAU request relocation to the second ΜΜΕ, so that the second 艮 is requested according to the TAU Initiate the TAU process.

 In combination with the seventh aspect and the above possible implementation manners, in another possible implementation manner,

 The TAU request relocation includes an indication message; or the indication message is carried in a context response sent by the first 中 in the TAU flow to the second ;;

 The indication message is used to indicate that the second UI selects the original SGW to provide a service for the UE in the TAU process. An eighth aspect of the present invention provides a user equipment UE, including:

 a processor, configured to determine that the current state is an idle state; determining that the received second

- 12 - Correction page (Article 91) The tracking area identifier sent by the access network node is not in the tracking area list of the UE; wherein the second access network node is a node that currently serves the UE; and the transmitter is configured to send to the second The access network node sends a tracking area update TAU request, so that the second access network node initiates a TAU procedure according to the TAU request. A ninth aspect of the present invention provides a second access network node, including:

 a processor, configured to determine that the S1-AP connection for the user equipment UE on the dynamic S1 connection established by the second access network node and the first mobility management entity MME has been released, and the second access network Determining, by the node, the dynamic S 1 connection established by the first MME; or determining, by the second access network node, the S1 of all UEs on the dynamic S 1 connection established by the first MME The AP connection is released, and the second access network node releases the dynamic S 1 connection established with the first MME. A tenth aspect of the present invention provides an evolved packet system EPS, where the EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UEs, and the at least two access network nodes Each of the at least two MMEs includes a first MME and a second MME, where the at least two MMEs are configured to establish a static S1 connection. The first MME is the MME that currently serves the UE, the second MME establishes the static S 1 connection with the second access network node in advance; and the at least two access network nodes include the first connection a network access node and the second access network node, where the cell currently attached by the UE is a cell covered by the first access network node, and the cell covered by the first access network node and the second interface At least one cell covered by the network access node is adjacent, and the first access network node and the second access network node establish an X2 connection in advance.

 The mobility management method, device, and system provided by the embodiments of the present invention, in the new network architecture provided by the embodiment of the present invention, when the UE moves from the cell covered by the first access network node to the coverage of the second access network node In the cell, after receiving the handover request sent by the first access network through the X2 connection, the second access network node sends a handover request acknowledgement to the first access network node through the X2 connection, so that the access network node and the first access network node Two access network

- 13 - Correction page (Article 91) 90835

The node performs a handover execution process, and the second access network node determines the need and current

After the first MME that the UE provides the service establishes the dynamic S1 connection, establishes a dynamic S1 connection with the first MME, and then initiates a path switching procedure to the first MME through the established dynamic S1 connection, by utilizing the new simplified network architecture. When the UE moves, and needs to switch to the MME that provides the service, the S1 interface-based handover is no longer used, but the handover delay is reduced by adopting the X2 interface-based handover, and the mobility management process is improved. Switching performance in . DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

 FIG. 1 is a flowchart of a mobility management method according to Embodiment 1 of the present invention; FIG. 2 is a flowchart of a mobility management method according to Embodiment 2 of the present invention; FIG. 4 is a flowchart of another mobility management method according to Embodiment 3 of the present invention; FIG. 5 is a flowchart of still another mobility management method according to Embodiment 3 of the present invention;

6 is a schematic diagram of a composition of a second access network node according to Embodiment 4 of the present invention;

 FIG. 7 is a schematic diagram showing the composition of another second access network node according to Embodiment 4 of the present invention; FIG.

 FIG. 8 is a schematic structural diagram of a UE according to Embodiment 5 of the present invention;

 FIG. 9 is a schematic structural diagram of a second access network node according to Embodiment 6 of the present invention; FIG.

 FIG. 10 is a schematic structural diagram of a second access network node according to Embodiment 7 of the present invention; FIG.

FIG. 11 is a schematic structural diagram of a UE according to Embodiment 8 of the present invention; FIG. 12 is a schematic structural diagram of a second access network node according to Embodiment 9 of the present invention;

 FIG. 13 is a schematic structural diagram of an EPS according to Embodiment 10 of the present invention. detailed description

 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 The techniques described herein can be used in a variety of communication systems, such as current 2G, 3G communication systems and next generation communication systems, such as Global System for Mobile communications (GSM), Code Division Multiple Access (Code Division Multiple Access) , CDMA) system, Time Division Multiple Access (TDMA) system, Wideband Code Division Multiple Access Wireless (WCDMA), Frequency Division Multiple Addressing (FDMA) system, orthogonal Orthogonal Frequency-Division Multiple Access (OFDMA) system, single carrier FDMA (SC-FDMA) system, General Packet Radio Service (GPRS) system, LTE system, and other such communication systems.

 Various aspects are described herein in connection with a terminal and/or base station and/or base station node.

 The user equipment, which may be a wireless terminal or a wired terminal, may be a device that provides voice and/or data connectivity to the user, a handheld device with wireless connectivity, or other processing device connected to the wireless modem. The wireless terminal can communicate with one or more core networks via a wireless access network (eg, Radio Access Network, RAN), which can be a mobile terminal, such as a mobile phone (or "cellular, telephone") and with mobile The computers of the terminal, for example, may be portable, pocket, handheld, computer built-in or in-vehicle mobile devices that exchange language and/or data with the wireless access network. For example, personal communication services (Personal

- 15 - Correction page (Article 91) Communication Service, PCS) Telephone, cordless telephone, Session Initiation Protocol (SIP) telephone, Wireless Local Loop (WLL) station, Personal Digital Assistant (PDA) and other equipment. A wireless terminal may also be referred to as a system, a Subscriber Unit, a Subscriber Station, a Mobile Station, a Mobile, a Remote Station, an Access Point, Remote Terminal, Access Terminal, User Terminal, User Agent, User Equipment.

 A base station (e.g., an access point) can refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. The base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network. The base station also coordinates the management of attributes to the air interface. For example, the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a Radio Network Controller (RNC) base station (NodeB) in WCDMA, or may be an evolved base station in LTE. (evolutional Node B, NodeB or eNB or e-NodeB), this application is not limited.

 In addition, the terms "system" and "network" are often used interchangeably herein. The term "and/or" in this context is merely an association describing the associated object, indicating that there can be three relationships, for example, A and / or B, which can mean: A exists separately, and both A and B exist separately. B these three situations. In addition, the character " /" in this article generally means that the contextual object is an "or" relationship.

In 2012, the operator released the Network Function Virtualization (NFV) white paper, announcing the establishment of the NFV Industry Standard Group (ISG) at the European Telecommunications Standards Institute (ETSI), and currently worldwide. Nearly 100 companies have become members of the NFV ISG. The purpose of the operator's establishment of NFV ISG is to define the requirements of the operator's network function virtualization and related technical reports. It is hoped that by using the Internet technology (IT) virtualization technology, the universal high performance Part of the network functionality is implemented in servers, switches, and storage. This purpose of the operator needs to implement this part of the network function in software, and can run on the hardware of general-purpose high-performance servers, switches and storage, and this part of the network functions can be migrated and instances as needed. And deployed in different locations on the network without the need to install new devices. At present, many types of network devices, such as servers, routers, storage devices, content distribution networks (CDNs), switches, etc., can be separated by software and hardware through NFV technology, so that they can be deployed in data centers and network nodes. Or at the user's home. In the NFV white paper issued by the operator, the following scenarios are highlighted: Broadband Network Gateway (BNG), Carrier Grade Network Address Translation (CG-NAT), Router, Mobile Network EPC : Internet Protocol Multimedia Core Network Subsystem (IMS), RAN, home network, etc.

 NFV technology mainly includes three key features: First, the software that defines the network function is completely separated from the general high-performance server, storage and switch; Second, the independent modularization of software and hardware components; Third, automated orchestration That is, the software is completely remotely installed and managed based on general-purpose hardware, and NFV technology has its unique architecture. It is also because of the characteristics of NFV technology and its unique architecture that enables it to orchestrate and manage domain functions. And use the resources of the network connection domain to establish a network connection between any computing or storage node in the same network function virtual 4b infrastructure (NFVI) domain.

In the prior art, after the EPS introduces the 3GPP Pool technology, several MME pools can be deployed in the EPC, and all MMEs in the MME pool should pass through all access network nodes (such as base stations) in the MME pool service area. The S1 interface is connected. Generally, the connection between the access network node and the MME through the S1 interface is established when the access network node and the MME are powered on, and the E-UTRAN of the EPS is connected to the network. Nodes are connected through an X2 interface. It is well known that in this application scenario, when the UE moves, the EPS may need to initiate a handover based on the S1 interface, or may correct the page (3⁄4i, Article 91). The switch based on the X2 interface needs to be initiated, and the S1 interface-based handover initiated by the EP S is more than the X2 interface-based handover, and the signaling interaction of the core network is more, so that for the S1 interface-based handover, Switching performance is not good. Therefore, how to improve the performance of handover and simplify the process and complexity of mobility management has become an important topic for researchers in the field. Especially with the gradual maturity of NFV technology, it brings optimization space to the mobility management process of 3GPP EP S network.

 NFV can automatically orchestrate NFV Infrastructure (NFVI) hardware resources through NFV's 4 Management and Orchestration (MANO). NFVI hardware resources can be used for multiple different virtualized network functions (Virtualizati on Network) Function, VNF) (such as virtualized MME, virtualized S GW, etc.) use, and can flexibly arrange resources according to needs, coordinate and allocate the hardware resources needed for VNF operation, and create a virtual running environment of VNF. The hardware resources mentioned here include computing resources, storage resources, and network resources.

 On the one hand, when the load of the network function node (such as MME, S GW) increases, not only the traditional 3GPP pool (such as MME pool, S GW pool) can be used for load sharing, but part of the load is transferred to other nodes. You can also take advantage of the NF V's ability to automate the scalability of resources used by VNF, adding the required hardware resources to the network function nodes.

 On the other hand, the NFV's features and architecture enable it to leverage the resources of the infrastructure network domain to establish network connectivity between any compute and storage nodes within the same NFVI domain through the capabilities provided by MANO. And with the development and advancement of technology, the time to establish this connection can be very short.

 These features provided by the NFV for virtual network functions can be used in the mobility management process of 3GPP, such as establishing a dynamic S 1 connection between the base station and the MME as needed in a very short time.

 It should be noted that, in order to facilitate the understanding of those skilled in the art, a Long Term Evoluti on (LTE) network is taken as an example in the embodiment of the present invention. The mobility management method, apparatus and system provided by the present invention are also applicable to 3G

- 18 - Correction page (Article 91) In the network, the terminal performs handover based on the Iur interface, and the RNC dynamically establishes the mobility management process of the Iu connection to the SGSN according to the requirement. In the embodiment of the present invention, only an LTE network is taken as an example, but it is not limited to an LTE network.

 The embodiment of the present invention provides a new simplified network architecture, that is, at least two MMEs included in the EPS, at least two access network nodes, and at least two access network nodes in the UE. Each of the access network nodes establishes a static S 1 connection with any one of the at least two MMEs in advance. On the basis of the new network architecture provided by the embodiment of the present invention, in the mobility management method provided by the embodiment of the present invention, the selection function of the node in the 3GPP network is simplified by utilizing the characteristics of the NFV technology, and the mobility is simplified. The handover process in the management process improves the handover performance in the mobility management process, and reduces the complexity of the implementation of the UE. For a specific implementation process, reference may be made to the specific description of the embodiments of the present invention.

Example 1

 Embodiment 1 of the present invention provides a mobility management method, which is applied to an EPS, where the EPS includes at least two MMEs, at least two access network nodes, and a UE. Each of the at least two access network nodes establishes a static S 1 connection with any one of the at least two MMEs in advance. The at least two MMEs include a first MME and a second MME, where the first MME is an MME that currently serves the UE, and the second MME establishes a static S1 connection with the second access network node in advance; and at least two The network access node includes a first access network node and a second access network node, where the cell currently attached by the UE is a cell covered by the first access network node, and the cell covered by the first access network node and the first At least one cell covered by the two access network nodes is adjacent, and the first access network node and the second access network node establish an X2 connection in advance. Specifically, as shown in FIG. 1, the method may include:

 101 A. When the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, the second access network node receives the handover request sent by the first access network node through the X2 connection.

Wherein, when the UE moves from the cell covered by the first access network node to the second access network When the cell covered by the node, the first access network node may send a handover request to the second access network node by using an X2 connection established in advance with the second access network node, and the second access network node may receive the first A handover request sent by an access node over an X2 connection.

 1 02A. The second access network node sends a handover request acknowledgement to the first access network node through the X2 connection, so that the first access network node and the second access network node perform a handover execution process.

 In response to the received handover request, the second access network node may send a handover request acknowledgement to the first access network node through the X2 connection, so that the first access network node and the second access network node may The handover execution process is performed, so that the second access network node continues to provide services for the UE.

 1 03A. The second access network node determines that a dynamic S 1 connection needs to be established with the first MME. The second access network node may further determine whether a dynamic S1 connection needs to be established with the first MME that is currently serving the UE, and after determining that the dynamic S1 connection needs to be established with the first MME currently serving the UE, Perform the following step 104A.

 104A. The second access network node establishes a dynamic S1 connection with the first MME.

 After the second access network node determines that the dynamic S1 connection needs to be established with the first MME, the dynamic S1 connection can be established with the first MME.

 105A. The second access network node initiates a path switching procedure to the first MME by using a dynamic S1 connection.

 After the second access network node establishes a dynamic S1 connection with the first MME, the second access network node can initiate a path switching procedure to the first MME by using the dynamic S1 connection established with the first MME.

 It should be noted that, in the embodiment of the present invention, the order of execution of step 101 A-step 104A is not specifically limited. Specifically, in a possible implementation manner of the embodiment of the present invention, the step 103A and the step 104A may be performed after the execution of the step 101A is completed. In another possible implementation manner of the embodiment of the present invention, Step 103A may be performed after the execution of step 101 A is completed, and step 104A may be performed after the second access network node described in step 102A sends a handover request acknowledgement to the first access network node through the X2 connection; In another possible implementation of the example, step

- 20 - Correction page (Article 91) The second access network node described in step 102A sends a handover request acknowledgement to the first access network node through the X2 connection, and step 103 A and step 104A may also be performed simultaneously after performing step 10 1 A; In a further possible implementation of the example, the step 103A and the step 104A may be performed after the first access network node and the second access network node described in step 102A perform a handover execution process.

 The mobility management method provided by the embodiment of the present invention, in the new network architecture provided by the embodiment of the present invention, when the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, After receiving the handover request sent by the first access network through the X2 connection, the second access network node sends a handover request acknowledgement to the first access network node through the X2 connection, so that the first access network node and the second access network The node performs a handover execution process, and the second access network node establishes a dynamic S1 connection with the first MME after determining that a dynamic S1 connection needs to be established with the first MME currently serving the UE, and then establishes a dynamic S1 connection. The connection initiates a path switching procedure to the first MME, and by using the new simplified network architecture, when the UE moves and needs to switch to the MME that provides the service, the switch based on the S1 interface is no longer used, but the adoption is adopted. Based on the X2 interface switching, the handover delay is reduced, and the handover performance in the mobility management process is improved. Example 2

 Embodiment 2 of the present invention provides a mobility management method, where a UE moves from a cell covered by a first access network node to a cell covered by a second access network node, and the first access network node to the second connection is completed. After the handover of the ingress network node, the UE also needs to determine whether the TAU process needs to be triggered according to the tracking area identifier of the currently attached cell (ie, the cell covered by the second access network node). In the embodiment of the present invention, after the UE enters the idle state, it is determined whether the TAU process needs to be triggered. Specifically, as shown in FIG. 2, the method may include:

 101 B. The UE determines that the current state is an idle state.

1 02B > The UE determines that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE. Correction page is Article 91) The second access network node is a node that currently provides services for the UE. After the UE determines that the current state is the idle state, the UE may determine whether the received tracking area identifier sent by the second access network node exists in its own tracking area list, and determines the received second connection in the UE. When the tracking area identifier sent by the ingress node is not in the tracking area list of the UE, the following step 103B is performed.

 1 03B. The UE sends a TAU request to the second access network node, so that the second access network node initiates a TAU process according to the TAU request.

 After the UE determines that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE, the UE sends a TAU request to the second access network node, so that the second access network node will receive the second access network node. The TAU request is sent to the second MME that has previously established a static S1 connection with itself, and the second MME initiates the TAU procedure according to the TAU request.

 The mobility management method provided by the embodiment of the present invention determines that the current state of the UE is in an idle state, and determines that the tracking area identifier sent by the second access network node corresponding to the currently attached cell is not in the tracking area of the UE. After the list, the TAU request is sent to the second access network node to trigger the TAU process. In the embodiment of the present invention, the UE triggers the TAU process only in the idle state, which reduces the complexity of the UE implementation.

Example 3

 Embodiment 3 of the present invention provides a mobility management method, which is applied to an EPS, where the EPS includes at least two MMEs, at least two access network nodes, and a UE. Each of the at least two access network nodes establishes a static S1 connection with any one of the at least two MMEs in advance. The at least two MMEs include a first MME and a second MME, where the first MME is an MME that currently serves the UE, and the second MME establishes a static S1 connection with the second access network node in advance; and at least two The network access node includes a first access network node and a second access network node, where the cell currently attached by the UE is a cell covered by the first access network node, and the cell covered by the first access network node and the first At least one cell covered by the two access network nodes is adjacent, and the first access network node and the second access network node establish an X2 connection in advance. Specifically, as shown in FIG. 3, the method can

- 22 - Correction page (Article 91) 2013/090835

To include:

 201. When the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, the second access network node receives the handover request sent by the first access network node by using the X2 connection.

 The handover request may carry a Globally Unique MME Identifier (GUMMEI) of the first MME. When the UE moves from the cell covered by the first access network node to the cell covered by the second access network node of the at least one neighboring cell of the cell covered by the first access network node, the first access network node may pass The X2 connection established in advance with the second access network node sends a handover request to the second access network node, and the second access network node can receive the handover request sent by the first access node through the X2 connection.

 202. The second access network node sends a handover request acknowledgement to the first access network node by using an X2 connection.

 In response to the received handover request, the second access network node may send a handover request acknowledgement to the first access network node through the X2 connection, so that the following step 203 may be performed, so that the second access network node continues for the UE. Provide services.

 203. The first access network node and the second access network node perform a handover execution process. The second access network node sends a handover request acknowledgement to the first access network node by using the X2 connection, and after the first access network node receives the handover request acknowledgement sent by the second access network node, the first access network node The handover execution procedure may be performed with the second access network node, so that after the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, the second access network node may continue for the UE. Provide services.

 204. The second access network node determines, according to the GUMME1 carried in the handover request, that the MME currently serving the UE is the first MME.

 After the second access network node receives the handover request sent by the first access network node, it may determine, according to the GUMMEI carried in the received handover request, which MME is currently serving the UE, which is implemented in the present invention. In the example, the GUMMEI carried in the handover request is the identifier of the first MME, so the second access network node can determine that the UE is currently serving the UE according to the GUMMEI carried in the handover request.

- 23 - Correction page (Article 91) MME is the first MME

 It should be noted that, in the embodiment of the present invention, each of the at least two access network nodes included in the EPS is pre-only with at least two MMEs in the new simplified network architecture provided. Any one of the MMEs establishes a static S1 connection, so the second access network node receives the handover request sent by the first access network node, and determines that the MME currently serving the UE is the first according to the GUMMEI carried in the handover request. After the MME, the second access network node can determine whether it needs to establish a dynamic S1 connection with the first MME, so as to complete the path switching process in the handover process. In a possible implementation manner of the embodiment of the present invention, the second access network node has established a static S 1 connection with the first MME in advance, that is, the first MME is the same as the second MME, that is, the second The access network node determines that it does not need to establish a dynamic S1 connection with the first MME. At this time, the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, and needs to perform the X2-based SGW. The switching process of the change is the same as that of the X2-based SGW in the prior art. The embodiments of the present invention are not described in detail herein. In another possible implementation manner of the embodiment of the present invention, the second access network node determines that there is no need to establish a dynamic S 1 connection with the first MME, but the second access network node and the first MME have established a dynamic S. When 1 is connected, step 207 can be directly executed. Specifically, in an application scenario in which a dynamic S1 connection is established based on each access network node, the second access network node determines that the UE does not establish a static S1 connection with the first MME in advance according to the GUMMEI carried in the handover request. That is, the first MME is different from the second MME, but it is determined that the second access network node and the first MME have established a dynamic S1 connection, and the second access network node also determines that the dynamic does not need to be established with the first MME. S1 is connected, but initiates a path switching procedure to the first MME through a dynamic S1 connection established with the first MME, that is, without performing step 206, directly determining that there is an established dynamic S1 connection, After the dynamic S1 connection needs to be established with the first MME, step 207 is performed. In a further possible implementation of the embodiment of the present invention, the second access network node determines that it needs to establish a dynamic S1 connection with the first MME, and specifically performs the following steps 205 and 206.

 205. The second access network node determines that a dynamic S1 connection needs to be established with the first MME.

- 24 - Correction page (Article 91) 90835

The second access network node receives the handover request sent by the first access network node, and determines, according to the GUMME1 carried in the handover request, that the MME currently serving the UE is the first MME, and the second access network node It can be determined whether it needs to establish a dynamic S 1 connection with the first MME. Specifically, in a possible implementation manner of the embodiment of the present invention, a dynamic S1 connection may be established based on each UE, and when the second access network node determines that it is not in advance according to the GUMMEI carried in the handover request, A static S1 connection is established with the first MME, that is, when the first MME is different from the second MME, the second access network node determines that a dynamic S1 connection needs to be established with the first MME. Alternatively, in another possible implementation manner of the embodiment of the present invention, a dynamic SI connection may be established based on each access network node, where the second access network node determines its own advance according to the GUMMEI carried in the handover request. A static S1 connection is not established with the first MME, that is, the first MME is different from the second MME, and the second access network node determines that the second access network node does not establish a dynamic S1 connection with the first MME. A dynamic S 1 connection needs to be established with the first MME.

 206. The second access network node establishes a dynamic S1 connection with the first MME.

 After the second access network node determines that the dynamic S1 connection needs to be established with the first MME, the second access network node can establish a dynamic S1 connection with the first MME.

 In the embodiment of the present invention, the process of establishing a dynamic S 1 connection between the second access network node and the first MME may be: the second access network node first sends an S 1 connection establishment request to the first MME, where After receiving the S1 connection establishment request sent by the second access network node, the first MME sends an S1 connection establishment response to the second access network node, and the second access network node can receive the first MME transmission. The S 1 connection establishes a response, thereby completing the establishment of a dynamic S 1 connection.

It should be noted that, in the embodiment of the present invention, the order of execution of step 201 - step 206 is not specifically limited. Specifically, in a possible implementation manner of the embodiment of the present invention, the step 204 to the step 206 may be performed after the step 201 is performed. In another possible implementation manner of the embodiment of the present invention, the step 204 and the step are performed. 205 may be performed after the execution of step 201 is completed, and step 206 is performed after the execution of step 202 is completed; in yet another possible implementation manner of the embodiment of the present invention, the step correction page (rule 91) 204 - Step 206 and Step 202 may be performed simultaneously after performing Step 20 1; In still another possible implementation of the embodiment of the present invention, Step 204 - Step 206 may be performed after the execution of Step 203 is completed. The step 204 to step 206 may be performed after the step 203 is performed. The second access network node detects that the UE has switched to the second access network node, and after completing the air interface connection, performing step 204-step. 206. Specifically, after successfully accessing the second access network node, the UE needs to send an RRC connection reconfiguration complete message to the second access network node, to notify the second access network node that the handover process has been completed. After receiving the RRC connection reconfiguration complete message sent by the UE, the second access network node may perform steps 204-206.

 207. The second access network node initiates a path switching procedure to the first MME by using a dynamic S1 connection.

 After the second access network node establishes a dynamic S1 connection with the first MME, the second access network node may initiate a path switching procedure to the first MME by using the dynamic S1 connection, and in the embodiment of the present invention, The SGW that the second access network node initiates to the first MME does not change the SGW that serves the UE, that is, the first MME selects the original SGW to provide services for the UE, so as to further simplify the handover process and improve handover performance. The original SGW is the SGW currently serving the UE. The second access network node initiates a path switching process to the first MME by using the dynamic S1 connection, which may specifically include the following steps 207a-step 207e:

 207a. The second access network node sends a path switch request to the first MME by using a dynamic S1 connection.

 207b. The first MME sends a bearer update request to the SGW in response to the received path switch request.

 207c. The SGW sends a 7-load update response to the first MME in response to the received bearer update request.

 Optionally, after the SGW receives the bearer update request sent by the first MME, the SGW may send the bearer update request to the Packet Data Network-Gateway (PGW), and after receiving the bearer update request, the PGW may Sending a bearer update response to the SGW, and the SGW receives the bearer update response sent by the PGW.

- 26 - Correction page (Article 91) 5

Then, the bearer response is sent to the first MME.

 207d. The first MME sends a path switch request acknowledgement to the second access network node by using a dynamic S1 connection.

 207e. The second access network node sends a release resource message to the first access network node. Moving from the cell covered by the first access network node to the cell covered by the second access network node, and after performing step 201 - step 207, completing the first access network node to the second access network node After the handover, the UE also needs to determine whether the TAU process needs to be triggered according to the tracking area identifier of the currently attached cell (ie, the cell covered by the second access network node).

 In a possible implementation manner of the embodiment of the present invention, after the UE is in the idle state, when the UE determines that the TAU process needs to be triggered, the TAU process is initiated. Specifically, as shown in FIG. 4, the following steps may be included. 301 - Step 304.

 301. The UE determines that the current state is an idle state, and determines that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE.

 When the UE determines that the current state is the idle state, the UE determines whether the received tracking area identifier broadcast by the second access network node exists in its own tracking area list, and when the UE determines the received second When the tracking area identifier broadcast by the access network node is not in the tracking area list of the UE, the following step 302 is performed.

 302. The UE sends a Tacking Area Update (TAU) request to the second access network node.

 After the UE determines that the current state is the idle state, and determines that the received tracking area identifier broadcast by the second access network node is not in the tracking area list of the UE, the UE may send the TAU to the second access network node. request.

 303. The second access network node receives the TAU request sent by the UE.

 The TAU request is sent by the UE after determining that the current state is an idle state, and determining that the received tracking area identifier broadcast by the second access network node is not in the tracking area list of the UE. After the UE sends a TAU request to the second access network node, the second access network node can receive the TAU request sent by the UE.

 304. The second access network node sends the TAU request to the second through the static S1 connection.

- 27 - Correction page (Article 91) MME, so that the second MME initiates the TAU procedure according to the TAU request.

 After the second access network node receives the TAU request sent by the UE, the TAU request is directly sent to the second MME through the static S1 connection, so that the second MME initiates the TAU process according to the TAU request. In the embodiment of the present invention, after receiving the TAU request sent by the UE, the second access network node directly selects the second MME that has established the static S1 connection as the MME that continues to provide the service for the UE, and does not need to be based on the UE. The provided information or other rules to select the MME that continues to provide services for the UE, the function of the second access network node.

 In a possible implementation manner of the embodiment of the present invention, the SGW changes during the process of performing the TAU, and the second MME initiates the TAU process according to the TAU request. The specific step may include the following steps 304a - 304a 14 .

 304al. The second MME sends a context request to the first MME.

 304a2. The first MME sends a context response to the second MME in response to the received context request.

 Further, optionally, after the first MME sends a context response to the second MME, the UE and the second MME, the second MME, and the home subscriber server (HSS) may further perform an answering process, to Ensure the legitimacy of the second MME serving the UE.

 304a3: The second MME sends a context confirmation to the first MME.

 304a4: The second MME sends a create bearer request to the new SGW.

 304a5: The new SGW sends a bearer update request to the PGW.

 Optionally, after the PGW receives the bearer update request sent by the new SGW, the PGW may initiate an IP connectivity access network (IP) to the Policy and Charging Rules Function (PCRF). -CAN) session update process, and after step 100a6 is completed after the IP-CAN session update process is completed.

 304a6, the PGW sends an update response to the new SGW.

 304a7: The new SGW sends a create 7-load response to the second MME.

 304a8: The second MME sends a location update message to the HSS.

•28 - Correction page (Article 91) 304a9: The HSS sends a location cancellation message to the first MME.

 304al0, the first MME sends a location cancellation confirmation to the HSS.

 Optionally, after the first MME sends the location cancellation confirmation to the HSS, the lu network connection release command may be sent to the radio network controller (RNC), and the lu connection release complete message sent by the RNC is received.

 304all, HSS sends a location update confirmation to the second MME.

 304al2: The first MME sends a delete bearer request to the original SGW.

 304al3: The original SGW sends a delete bearer response to the first MME.

 304al4: The second MME sends a TAU accept to the UE to notify the UE that the process has been completed.

 Further, optionally, the UE may further send a TAU to the second MME. It should be noted that, in the embodiment of the present invention, if the second access network node has established a static S1 connection with the first MME in advance, that is, in the new network architecture, the first MME is the same as the second MME, that is, In the TAU process, the second MME to which the second access network node sends the TAU request is the first MME that currently serves the UE, that is, the MME does not change during the TAU, and the second MME The TAU request to initiate the TAU procedure does not need to perform step 304al-step 304a3, and step 304a8-step 304all in the above steps.

 In another possible implementation manner of the embodiment of the present invention, the SGW does not change during the process of performing the TAU, and the second MME may initiate the TAU process according to the TAU request, which may specifically include the following step 304bl-step 304b9.

 304b. The second MME sends a context request to the first MME.

 304b2. The first MME sends a context response to the second MME in response to the received context request.

 Further, optionally, after the first MME sends the context response to the second MME, the UE and the second MME, and the second MME and the HSS may perform an authentication process to ensure the second MME serving the UE. Legitimacy.

 304b3: The second MME sends a context confirmation to the first MME.

 304b4: The second MME sends a bearer update request to the SGW.

-29- Correction page (Article 91) 304b5: The SGW sends a bearer update response to the second MME.

 Further, optionally, the second MME sends a bearer update request to the SGW, and after the SGW receives the bearer update request, the SGW may send the bearer update request to the PGW, and after receiving the bearer update request, the PG W may initiate to the PCRF. The IP-CAN session update process, and after the IP-CAN session update process is completed, the PGW sends a bearer update response to the SGW, and after the SGW receives the bearer update response sent by the PGW, step 304b5 is performed.

 304b6: The second MME sends a location update request to the HSS.

 304b7: The HSS sends a location cancellation message to the first MME.

 304b7: The first MME sends a location cancellation confirmation to the HSS.

 Optionally, after the first MME sends a location cancellation confirmation to the HSS, the lu connection release command may be sent to the RNC, and the lu connection release complete message sent by the RNC is received.

 304b8. The HSS sends a location update confirmation to the second MME.

 304b9: The second MME sends a TAU accept to the UE to notify the UE that the process has been completed.

 Further, optionally, the UE may further send a TAU to the second MME. It should be noted that, in the embodiment of the present invention, if the second access network node has established a static S 1 connection with the first MME in advance, that is, in the new network architecture, the first MME is the same as the second MME, that is, In the TAU process, the second MME to which the second access network node sends the TAU request is the first MME that currently serves the UE, that is, the MME does not change during the TAU, and the second MME is based on the TAU. The request to initiate the TAU procedure does not require performing step 304b - step 304a8 of the above steps.

 In another possible implementation manner of the embodiment of the present invention, when the UE is in the connected state, when the UE determines that the TAU process needs to be triggered, the TAU process is initiated. Specifically, as shown in FIG. 5, the following may be included. Step 401 - Step 407.

 401. The UE determines that the received tracking area identifier broadcast by the second access network node is not in the tracking area list of the UE.

- 30 - Correction page (Article 91) After completing the handover of the first access network node to the second access network node,

The UE also needs to determine whether the TAU process needs to be triggered according to the tracking area identifier of the currently attached cell (that is, the cell covered by the second access network node). Specifically, the UE needs to determine the received tracking sent by the second access network node. If the area identifier exists in its own tracking area list, and it is determined that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE, the following step 402 is performed.

 402. The UE sends a TAU request to the first MME by using the second access network node. When the UE needs to initiate the TAU process, the UE accesses the TAU request to the second access network node after the UE sends the TAU request to the second access network node, and the second access network node transparently sends the received TAU request to the first MME. .

 403. The first MME receives a TAU request sent by the UE by using the second access network node.

404. The first MME determines that the tracking area identifier of the cell covered by the second access network node where the UE is located is not in the managed tracking area of the first MME.

 After the first MME receives the TAU request sent by the UE through the second access network node, it can determine whether the tracking area identifier of the cell covered by the second access network node where the UE is located exists in the first MME. In the managed tracking area, and when determining that the tracking area identifier of the cell covered by the second access network node where the UE is located is not in the managed tracking area of the first MME, the following step 405 is performed.

 405. The first MME sends a TAU request relocation to the second access network node by using a dynamic S1 connection.

 After the first MME determines that the tracking area identifier of the cell covered by the second access network node where the UE is located is not in the managed tracking area of the first MME, the first MME may establish with the second access network node. The dynamic S1 connection sends a TAU request relocation to the second access network node, so that the second access network node reselects the MME for which the UE is serving.

 406. The second access network node receives the TAU request relocation that is sent by the first MME through the dynamic S1 connection.

 The TAU requests relocation to the first MME to receive the TAU request sent by the UE through the second access network node, and determines the second access network node where the UE is located.

- 31 - Correction page (Article 91) After the tracking area identifier of the covered cell is not sent in the managed tracking area of the first MME, the TAU requests the relocation to carry the TAU request.

 407. The second access network node sends the TAU request carried in the TAU request relocation to the second MME by using the static S1 connection, so that the second MME initiates the TAU process according to the TAU request.

 After the second access network node receives the TAU request relocation by the first MME to send the TAU, the TAU request to be sent in the TAU request relocation is directly sent through the static S1 connection established with the second MME. To the second MME, so that the second MME initiates a TAU procedure according to the TAU request. In the embodiment of the present invention, after receiving the TAU request relocation sent by the first MME, the second access network node directly selects the second MME that has established a static S 1 connection as the MME that continues to provide services for the UE. It is not necessary to select an MME that continues to provide services for the UE according to information provided by the UE or other rules, which simplifies the function of the second access network node.

 It should be noted that, in the embodiment of the present invention, the second MME may initiate a TAU process according to the TAU request, and may refer to the specific description of the steps 304b-304b9 in the embodiment of the present invention.

 In the embodiment of the present invention, the second MME selects the original SGW to continue to provide services for the UE, that is, does not change the SGW in the process of performing the TAU, and is used to indicate that the second MME selects the original SGW to provide the service for the UE in the TAU process. The message may be notified to the second MME through step 405-step 407, that is, the indication information is included in the TAU request relocation, or the indication message may be carried in the context response sent by the first MME to the second MME in the TAU procedure. Notifying the second MME, so that the second MME continues to select the original SGW to provide services for the UE to further improve handover performance in the mobility management process.

 In the embodiment of the present invention, a mobility management method is further provided. In the foregoing embodiment, the second access network node establishes a dynamic S1 connection with the first MME, and the dynamic S is released in the embodiment of the present invention. 1 The process of connecting. Specifically: for an application scenario in which a dynamic S1 connection is established based on each UE, when the second access network node determines that the second access network node and the first MME are connected to the dynamic S1 of the first MME, the S1 for the UE is AP

- 32 - Correction page (Article 91) After the connection is released, the second access network node releases the dynamic S1 connection established with the first MME, where the S1-AP connection of the UE on the dynamic S1 connection is that the UE leaves the second access network node because of the handover requirement. The cell is either released because the TAU needs to be in other MMEs, or when the UE needs to enter the idle state. Or, after establishing a dynamic S1 connection based on each access network node, when the second access network node determines that the S1-AP connection of all UEs on the dynamic S1 connection of the second access network node and the first MME is released, The second access network node releases the dynamic S1 connection established with the first MME, where the S1-AP connection of each UE on the dynamic S1 connection is a cell that is covered by the second access network node when the UE needs to be switched. Or because the TAU needs to be released by other MMEs, or when the UE needs to enter an idle state or the like.

 The mobility management method provided by the embodiment of the present invention, in the new network architecture provided by the embodiment of the present invention, when the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, After receiving the handover request sent by the first access network through the X2 connection, the second access network node sends a handover request acknowledgement to the first access network node through the X2 connection, so that the first access network node and the second access network The node performs a handover execution process, and the second access network node establishes a dynamic S1 connection with the first MME after determining that a dynamic S1 connection needs to be established with the first MME currently serving the UE, and then establishes a dynamic S1 connection through the established dynamic S1 connection. An MME initiates a path switching procedure, by using a new simplified network architecture, so that when the UE moves and needs to switch to the MME that provides the service, the S1 interface-based handover is no longer used, but the X2-based interface is adopted. Switching reduces the switching delay and improves the switching performance in the mobility management process. Example 4

 Embodiment 4 of the present invention provides a second access network node, which is applied to an evolved packet system EPS, where the EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UE, where the at least Each of the two access network nodes establishes a static S1 connection with any one of the at least two MMEs in advance.

-33- Correction page (Article 91) The at least two MMEs include a first MME and a second MME, where the first MME is an MME that currently serves the UE, and the second MME is established in advance with the second access network node. The static S 1 is connected; and the at least two access network nodes include a first access network node and the second access network node, and the cell currently attached by the UE is the first access network a cell covered by the node, the cell covered by the first access network node is adjacent to at least one cell covered by the second access network node, and the first access network node and the second access network node Establish an X2 connection in advance.

 As shown in FIG. 6, the second access network node in the embodiment of the present invention may include: a receiving unit 5 1 , a sending unit 52, a determining unit 53, an establishing unit 54, and an initiating unit 55.

 The receiving unit 5 1 is configured to: when the UE moves from a cell covered by the first access network node to a cell covered by the second access network node, receive the first access network node by using the The X2 connection sends a switch request.

 Wherein, when the UE moves from the cell covered by the first access network node to the cell covered by the second access network node of the at least one neighboring cell of the cell covered by the first access network node, the first access network node The handover request may be sent to the second access network node by using an X2 connection established in advance with the second access network node, and the receiving unit 51 may receive the handover request sent by the first access node through the X2 connection.

 The sending unit 52 is configured to send, by using the X2 connection, a handover request acknowledgement to the first access network node, so that the first access network node and the second access network node perform a handover execution process.

 In response to the handover request received by the receiving unit 51, the sending unit 52 may send a handover request acknowledgement to the first access network node through the X2 connection, so that the first access network node and the second access network may The node performs a handover execution procedure, so that after the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, the second access network node may continue to provide services for the UE.

The determining unit 53 is configured to determine that a dynamic S 1 connection needs to be established with the first MME. The establishing unit 54 is configured to establish the dynamic S 1 connection with the first MME. The initiating unit 55 is configured to initiate a path switching procedure to the first MME by using the dynamic S1 connection established by the establishing unit 54.

 It should be noted that the specific process of the path switching process initiated by the initiating unit 55 to the first MME in the embodiment of the present invention may be referred to the specific description of step 207 in the method embodiment of the present invention, and the embodiment of the present invention is no longer used herein. - Narrative.

 In the embodiment of the present invention, the determining unit 53 is further configured to determine that the dynamic S1 connection is not required to be established with the first MME, where the second access network node and the The first MME has established the dynamic S1 connection.

 The initiating unit 55 is further configured to initiate the path switching procedure to the first MME by using the dynamic S 1 connection.

 In the embodiment of the present invention, the handover request further carries the global unique MME identity GUMMEI of the first MME.

 The determining unit 53 is further configured to: before determining that the dynamic S1 connection needs to be established with the first MME, determining, according to the GUMME1 carried in the handover request, that the MME that currently provides the monthly service for the UE is the First MME.

 The determining unit 53 is specifically configured to:

 Determining that the first MME is different from the second MME according to the GUMME1 that is carried in the handover request, determining that the dynamic S1 connection needs to be established with the first MME; or, according to the handover request, The carried GUMMEI determines that the first MME is different from the second MME, and determines that the second access network node and the first MME do not establish the dynamic S1 connection, and determines that the The ―MME establishes the dynamic S 1 connection.

 The determining unit 53 is configured to determine, according to the GUMME1 carried in the handover request, that the first MME is different from the second MME, and determine the second access network node and the first MME. The dynamic S 1 connection has been established, and it is determined that the dynamic S 1 connection does not need to be established with the first MME.

 In the embodiment of the present invention, further, as shown in FIG. 7, the establishing unit 54 may include: a sending module 541 and a receiving module 542.

The sending module 541 is configured to send an S1 connection establishment request to the first MME. Correction page (then article 91) The receiving module 542 is configured to receive an S1 connection setup response sent by the first MME.

 In an embodiment of the present invention, the first MME selects the original serving gateway SGW to provide a service for the UE in the path switching process initiated by the initiating unit 55 to the first MME. The original SGW is the SGW currently serving the UE.

 After the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, and after completing the handover of the first access network node to the second access network node, the UE also needs to be attached according to the current The tracking area identifier of the cell (that is, the cell covered by the second access network node) determines whether the TAU process needs to be triggered.

 In the embodiment of the present invention, the receiving unit 51 is further configured to: after the initiating unit 55 initiates a path switching process to the first MME by using the dynamic S1 connection, a tracking area update TAU request sent by the UE; wherein the TAU request is that the UE determines that the current state is an idle state, and determines that the received tracking area identifier broadcast by the second access network node is not in the The UE's tracking area list is sent later.

 The sending unit 52 is further configured to send the TAU request to the second MME by using the static S1 connection, so that the second MME initiates a TAU procedure according to the TAU request.

 In an embodiment of the present invention, the receiving unit 51 is further configured to: after the initiating unit 55 initiates a path switching process to the first MME by using the dynamic S1 connection, Resolving the TAU request sent by the first MME by using the dynamic S1 connection; wherein the TAU request relocation is that the first MME receives the TAU request sent by the UE by using the second access network node And determining that the tracking area identifier of the cell that is covered by the second access network node that is not in the first MME is not in the managed tracking area of the first MME, and the TAU requests relocation to carry the location Describe the TAU request.

 The sending unit 52 is further configured to send, by using the static S1 connection, the TAU request carried in the TAU request relocation to the second MME, so that

- 36 - Correction page (Article 91) 90835

The second MME initiates a TAU procedure according to the TAU request.

 In an embodiment of the present invention, optionally, the TAU request relocation includes an indication message; or the indication message is sent by the first MME in the TAU process to the second MME. In the context response.

 The indication message is used to indicate that the second MME selects the original SGW to provide a service for the UE in the TAU process.

 It should be noted that, the specific description of the function module in the second access network node provided by the embodiment of the present invention may be referred to the specific description of the corresponding content in the method embodiment, which is not described in detail herein.

 The second access network node provided by the embodiment of the present invention, in the new network architecture provided by the embodiment of the present invention, when the UE moves from the cell covered by the first access network node to the cell covered by the second access network node After receiving the handover request sent by the first access network through the X2 connection, the second access network node sends a handover request acknowledgement to the first access network node through the X2 connection, so that the first access network node and the second access network The network access node performs a handover execution process, and the second access network node establishes a dynamic S1 connection with the first MME after determining that a dynamic S1 connection needs to be established with the first MME currently serving the UE, and then establishes a dynamic S1 connection. The S1 connection initiates a path switching procedure to the first MME, and by using the new simplified network architecture, when the UE moves and needs to switch to the MME that provides the service, the switch based on the S1 interface is no longer used, but By adopting the X2 interface-based handover, the handover delay is reduced, and the handover performance in the mobility management process is improved. Example 5

 Embodiment 5 of the present invention provides a UE, as shown in FIG. 8, including: a determining unit

61. Transmitting unit 62.

 The determining unit 61 is configured to determine that the current state is an idle state.

 The determining unit 61 is further configured to determine that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE, where the second access network node is currently the UE The node that provides the service.

- 37 - Correction page (Article 91) The sending unit 62 is configured to send a tracking area update TAU request to the second access network node, so that the second access network node initiates a TAU procedure according to the TAU request.

 It should be noted that the specific description of the function modules in the UE provided by the embodiment of the present invention may refer to the specific description of the corresponding content in the method embodiment, and the details of the embodiments of the present invention are not described in detail herein.

 The UE provided by the embodiment of the present invention determines that the current state of the UE is in an idle state, and determines that the tracking area identifier sent by the second access network node corresponding to the currently attached cell is not in the tracking area list of the UE. The TAU request is sent to the second access network node to trigger the TAU process. In the embodiment of the present invention, the UE triggers the TAU process only in the idle state, which reduces the complexity of the UE implementation. Example 6

 Embodiment 6 of the present invention provides a second access network node, as shown in FIG. 9, including: a determining unit 71.

 a determining unit 71, configured to determine that the S1-AP connection for the user equipment UE on the dynamic S1 connection established by the second access network node and the first mobility management entity MME has been released, and the second access The network node releases the dynamic S 1 connection established with the first MME; or the determining unit 71 is further configured to determine the dynamic S established by the second access network node and the first MME 1 The S 1 -AP connection of all UEs on the connection has been released, and the second access network node releases the dynamic S 1 connection established with the first MME.

 It should be noted that, the specific description of the function module in the second access network node provided by the embodiment of the present invention may be referred to the specific description of the corresponding content in the method embodiment, which is not described in detail herein.

 The second access network node provided by the embodiment of the present invention, in the new network architecture provided by the embodiment of the present invention, when the UE moves from the cell covered by the first access network node to the cell covered by the second access network node After receiving the handover request sent by the first access network through the X2 connection, the second access network node sends the first access network node through the X2 connection.

- 38 - Correction page (Article 91) Sending a handover request acknowledgement, so that the first access network node and the second access network node perform a handover execution procedure, and the second access network node determines that a dynamic S1 connection needs to be established with the first MME currently serving the UE. Establishing a dynamic S 1 connection with the first MME, and then initiating a path switching procedure to the first MME through the established dynamic S 1 connection, by using a new simplified network architecture, so that when the UE moves, and needs to switch to provide services In the MME, the switching based on the S1 interface is no longer used, but the switching delay based on the X2 interface is adopted, and the handover delay is reduced, and the handover performance in the mobility management process is improved. Example 7

 Embodiment 7 of the present invention provides a second access network node, which is applied to an evolved packet system EPS, where the EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UE, where the at least Each of the two access network nodes pre-establishes an "^ state S1 connection" with any one of the at least two MMEs.

 The at least two MMEs include a first MME and a second MME, where the first MME is an MME that currently serves the UE, and the second MME is established in advance with the second access network node. The static S 1 is connected; and the at least two access network nodes include a first access network node and the second access network node, and the cell currently attached by the UE is the first access network a cell covered by the node, where the cell covered by the first access network node is adjacent to at least one cell covered by the second access network node, the first access network node and the second access network node Establish an X2 connection in advance.

 As shown in FIG. 10, the second access network node may include: a receiver 81, a transmitter 82, and a processor 83.

 a receiver 81, configured to: when the UE moves from a cell covered by the first access network node to a cell covered by the second access network node, receive the first access network node by using the X2 Connect the sent handover request.

 a transmitter 82, configured to send, by using the X2 connection, the first access network node

 - 39

Correction page (Article 91) The handover request acknowledges, so that the first access network node and the second access network node perform a handover execution procedure.

 The processor 83 is configured to determine that a dynamic S1 connection needs to be established with the first MME, and establish the dynamic S1 connection with the first MME, and initiate a path switching process to the first MME by using the dynamic S1 connection. .

 In the embodiment of the present invention, the processor 83 is further configured to: determine that the dynamic S1 connection is not required to be established with the first MME, where the second access network node is The first MME has established the dynamic S1 connection; and initiates the path switching procedure to the first MME by using the dynamic S1 connection.

 In the embodiment of the present invention, optionally, the handover request carries a global unique MME identifier of the first MME, GUMMEIo.

 The processor 83 is further configured to determine, according to the GUMME1 carried in the handover request, that an MME currently serving the UE is the first, before determining that a dynamic S1 connection needs to be established with the first MME. MME.

 The processor 83 is configured to determine that the first MME is different from the second MME according to the GUMME1 that is carried in the handover request, and determine that the dynamic S1 connection needs to be established with the first MME; Or determining, according to the GUMME1 carried in the handover request, that the first MME is different from the second MME, and determining that the second access network node does not establish the dynamic S1 connection with the first MME And determining that the dynamic S1 connection needs to be established with the first MME.

 The processor 83 is configured to determine, according to the GUMME1 carried in the handover request, that the first MME is different from the second MME, and determine the second access network node and the first MME. The dynamic S1 connection has been established, and it is determined that the dynamic S1 connection does not need to be established with the first MME.

 In the embodiment of the present invention, the transmitter 82 is further configured to send an S1 connection establishment request to the first MME.

 The receiver 81 is further configured to receive an S1 connection setup response sent by the first MME.

 In the embodiment of the present invention, further optionally, the processor 83 is to the first

-40- Correction page (Article 91) In the path switching process initiated by the MME, the first MME selects the original monthly gateway SGW to provide services for the UE; and the original SGW is an SGW that currently provides services for the UE.

 In the embodiment of the present invention, the receiver 81 is further configured to: after the processor 83 initiates a path switching process to the first MME by using the dynamic S1 connection, receiving the UE. The sent tracking area updates the TAU request; wherein, the TAU request is that the UE determines that the current state is an idle state, and determines that the received tracking area identifier broadcast by the second access network node is not in the UE After the tracking area list is sent.

 The transmitter 82 is further configured to send the TAU request to the second MME by using the static S1 connection, so that the second MME initiates a TAU procedure according to the TAU request.

 In the embodiment of the present invention, the receiver 81 is further configured to: after the processor 83 initiates a path switching process to the first MME by using the dynamic S connection, a TAU requesting relocation by the MME by the dynamic S1 connection; wherein the TAU request relocation is that the first MME receives the TAU request sent by the UE by using the second access network node, And determining that the tracking area identifier of the cell that is covered by the second access network node that is not in the managed tracking area of the first MME is sent by the TAU, and the TAU request relocation carries the TAU request.

 The transmitter 82 is further configured to send, by using the static S1 connection, the TAU request carried in the TAU request relocation to the second MME, so that the second MME initiates according to the TAU request. TAU process.

 In an embodiment of the present invention, optionally, the TAU request relocation includes an indication message; or the indication message is sent by the first MME in the TAU process to the second MME. In the context response.

 The indication message is used to indicate that the second MME selects the original SGW to provide a service for the UE in the TAU process.

It should be noted that, in the second access network node provided by the embodiment of the present invention, the function module correction page (^, section 91) For a detailed description of the block, reference may be made to the specific description of the corresponding content in the method embodiment, which is not described in detail herein.

 The second access network node provided by the embodiment of the present invention, in the new network architecture provided by the embodiment of the present invention, when the UE moves from the cell covered by the first access network node to the cell covered by the second access network node After receiving the handover request sent by the first access network through the X2 connection, the second access network node sends a handover request acknowledgement to the first access network node through the X2 connection, so that the first access network node and the second access network The network access node performs a handover execution process, and the second access network node establishes a dynamic S1 connection with the first MME after determining that a dynamic S1 connection needs to be established with the first MME currently serving the UE, and then establishes a dynamic S1 connection. The S1 connection initiates a path switching procedure to the first MME, and by using the new simplified network architecture, when the UE moves and needs to switch to the MME that provides the service, the switch based on the S1 interface is no longer used, but By adopting the X2 interface-based handover, the handover delay is reduced, and the handover performance in the mobility management process is improved. Example 8

 The embodiment 8 of the present invention provides a UE, as shown in FIG. 1 , including: a processor 91 and a transmitter 92.

 The processor 91 is configured to determine that the current state is an idle state, and determine that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE, where the second access network node A node that currently serves the UE.

 The transmitter 92 is configured to send a tracking area update TAU request to the second access network node, so that the second access network node initiates a TAU procedure according to the TAU request.

 It should be noted that the specific description of the function modules in the UE provided by the embodiment of the present invention may refer to the specific description of the corresponding content in the method embodiment, and the details of the embodiments of the present invention are not described in detail herein.

 The UE provided by the embodiment of the present invention determines that the current state of the UE is in an idle state, and determines that the tracking area identifier sent by the second access network node corresponding to the currently attached cell is not in the tracking area list of the UE. Sending to the second access network node

- 42 - Correction page (Article 91) The TAU request is sent to trigger the TAU process. In the embodiment of the present invention, the UE triggers the TAU process only in the idle state, which reduces the complexity of the UE implementation. Example 9

 Embodiment 9 of the present invention provides a second access network node, as shown in FIG. 12, including: a processor 1001.

 The processor 1001 is configured to determine that the S1-AP connection for the user equipment UE on the dynamic S1 connection established by the second access network node and the first mobility management entity MME is released, and the second access The network node releases the dynamic S 1 connection established with the first MME; or, determines the S 1 of all UEs on the dynamic S 1 connection established by the second access network node and the first MME The AP connection has been released, and the second access network node releases the dynamic S1 connection established with the first MME.

 It should be noted that, the specific description of the function module in the second access network node provided by the embodiment of the present invention may be referred to the specific description of the corresponding content in the method embodiment, which is not described in detail herein.

 The second access network node provided by the embodiment of the present invention, in the new network architecture provided by the embodiment of the present invention, when the UE moves from the cell covered by the first access network node to the cell covered by the second access network node After receiving the handover request sent by the first access network through the X2 connection, the second access network node sends a handover request acknowledgement to the first access network node through the X2 connection, so that the first access network node and the second access network The network access node performs a handover execution process, and the second access network node establishes a dynamic S1 connection with the first MME after determining that a dynamic S1 connection needs to be established with the first MME currently serving the UE, and then establishes a dynamic S1 connection. The S1 connection initiates a path switching procedure to the first MME, and by using the new simplified network architecture, when the UE moves and needs to switch to the MME that provides the service, the switch based on the S1 interface is no longer used, but By adopting the X2 interface-based handover, the handover delay is reduced, and the handover performance in the mobility management process is improved. Example 10

- 43 - Correction page (Article 91) The embodiment of the present invention provides an evolved packet system EPS. As shown in FIG. 13, the EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UE, and the at least two connections. Each of the access network nodes in the network access node establishes a static S1 connection with any one of the at least two MMEs in advance;

 The at least two MMEs include a first MME 1101 and a second MME 1102, where the first MME 1101 is an MME currently serving the UE 1105, and the second MME 1102 is established in advance with a second access network node 1104. The static S1 connection; and the at least two access network nodes include a first access network node 1103 and the second access network node 1104, and the cell currently attached by the UE1105 is the first access a cell covered by the network node 1103, the cell covered by the first access network node 1103 is adjacent to at least one cell covered by the second access network node 1104, and the first access network node 1103 and the first The two access network nodes 1104 pre-establish an X2 connection.

 It should be noted that the specific description of the functional modules in the EPS provided by the embodiments of the present invention may be referred to the specific description of the corresponding content in the method embodiments.

 The EPS provided by the embodiment of the present invention, in the new network architecture provided by the embodiment of the present invention, when the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, the second access After receiving the handover request sent by the first access network through the X2 connection, the network node sends a handover request acknowledgement to the first access network node through the X2 connection, so that the first access network node and the second access network node perform handover. After the process is performed, the second access network node establishes a dynamic S1 connection with the first MME after establishing a dynamic S1 connection with the first MME that is currently serving the UE, and then initiates a dynamic S1 connection with the first MME through the established dynamic S1 connection. The path switching process, by utilizing the new simplified network architecture, enables the handover based on the S1 interface instead of the handover based on the X2 interface when the UE moves and needs to switch to the MME serving the service. The switching delay is small, which improves the switching performance in the mobility management process.

-44- Correction page (Article 91) And after the UE determines that the current state is an idle state, and determines that the tracking area identifier sent by the second access network node corresponding to the currently attached cell is not in the tracking area list of the UE, The network node sends a TAU request to trigger the TAU process. In the embodiment of the present invention, the UE triggers the TAU process only in the idle state, which reduces the complexity of the UE implementation.

 Through the description of the above embodiments, those skilled in the art can clearly understand that for the convenience and brevity of the description, only the division of the above functional modules is illustrated. In practical applications, the above functions can be allocated according to needs. It is completed by different functional modules, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the device described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

 In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be used. The combination may be integrated into another device, or some features may be ignored or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interface, device or unit, and may be electrical, mechanical or otherwise.

 The units described as separate components may or may not be physically separated, and the components displayed as the unit may be one physical unit or multiple physical units, that is, may be located in one place, or may be distributed to multiple different places. . Some or all of the units may be selected according to actual needs to achieve the objectives of the embodiment of the present embodiment.

 In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented either in the form of hardware or in the form of a software functional unit - if the integrated unit is implemented in the form of a software functional unit and is independent

- 45 - Correction page (Article 91) When the product is sold or used, it can be stored in a readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product in the form of a software product, or a part of the technical solution, which is stored in a storage medium. A number of instructions are included to cause a device (which may be a microcontroller, chip, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a removable hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and the like, which can store program codes. .

 The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims

claims

1. A mobility management method, characterized in that it is applied to the evolved packet system EPS. The EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UE. The at least two Each of the access network nodes establishes a static S 1 connection with any one of the at least two MMEs in advance;

Wherein, the at least two MMEs include a -th MME and a second MME, the -th MME is the MME currently providing services to the UE, and the second MME has established the said MME with the second access network node in advance. Static S1 connection; and the at least two access network nodes include a first access network node and the second access network node, and the cell to which the UE is currently attached is covered by the first access network node. a cell, the cell covered by the first access network node is adjacent to at least one cell covered by the second access network node, and the first access network node and the second access network node are pre-established X2 connection;

When the UE moves from the cell covered by the first access network node to the cell covered by the second access network node, the second access network node receives the first access network node through the The switching request sent by the X2 connection;

The second access network node sends a handover request confirmation to the first access network node through the X2 connection, so that the first access network node and the second access network node execute a handover execution process;

The second access network node determines that it needs to establish a dynamic S1 connection with the first MME;

The second access network node establishes the dynamic S1 connection with the first MME; the second access network node initiates a path switching process to the first MME through the dynamic S1 connection.

2. The method according to claim 1, further comprising:

The second access network node determines that it is not necessary to establish the dynamic S 1 connection with the first MME; wherein, the second access network node and the first MME have already established the dynamic S 1 connection. ;

The second access network node sends a message to the first MME through the dynamic S 1 connection. Start the path switching process.

3. The method according to claim 1 or 2, characterized in that the handover request carries the globally unique MME identifier GUMMEI of the first MME;

Before the second access network node determines that it needs to establish a dynamic S 1 connection with the first MME, it also includes:

The second access network node determines that the MME currently serving the UE is the first MME according to the GUMMEI carried in the handover request;

The second access network node determines that it needs to establish a dynamic S1 connection with the first MME, including:

The second access network node determines that the first MME is different from the second MME according to the GUMMEI carried in the handover request, and then determines that the dynamic S 1 connection needs to be established with the first MME; Alternatively, the second access network node determines that the first MME is different from the second MME according to the GUMMEI carried in the handover request, and determines that the second access network node is different from the first MME. If the MME does not establish the dynamic S 1 connection, it determines that it needs to establish the dynamic S 1 connection with the first MME; the second access network node determines that it does not need to establish the dynamic S 1 connection with the first MME. connections, including:

The second access network node determines that the first MME and the second MME are different according to the GUMMEI carried in the handover request, and determines that the second access network node and the first MME have If the dynamic S 1 connection is established, it is determined that there is no need to establish the dynamic S 1 connection with the first MME.

4. The method according to any one of claims 1 to 3, characterized in that establishing the dynamic S1 connection between the second access network node and the first MME includes: the second connection The network access node sends an S 1 connection establishment request to the first MME; and the second access network node receives the S 1 connection establishment response sent by the first MME.

5. The method according to any one of claims 1 to 4, characterized in that, in the path switching process initiated by the second access network node to the first MME, the first MME selects The original serving gateway SGW provides services for the UE; the original SGW It is the SGW that currently provides services to the UE.

6. The method according to any one of claims 1 to 5, characterized in that, after the second access network node initiates a path switching process to the first MME through the dynamic S1 connection, include:

The second access network node receives a tracking area update TAU request sent by the UE; wherein, the TAU request is when the UE determines that the current state is an idle state and determines that the received second access network node The tracking area identifier broadcast by the network access node is not in the tracking area list of the UE and is sent;

The second access network node sends the TAU request to the second MME through the static S1 connection, so that the second MME initiates a TAU process according to the TAU request.

7. The method according to any one of claims 1 to 5, characterized in that, after the second access network node initiates a path switching process to the first MME through the dynamic S1 connection, include:

The second access network node receives the TAU request relocation sent by the first MME through the dynamic S 1 connection; wherein, the TAU request relocation is when the first MME receives the UE through the The TAU request sent by the second access network node is sent after determining that the tracking area identifier of the cell covered by the second access network node where the UE is located is not in the tracking area managed by the first MME. , the TAU request relocation carries the TAU request;

The second access network node sends the TAU request carried in the TAU request relocation to the second MME through the static S1 connection, so that the second MME initiates a TAU request according to the TAU request. process.

8. The method according to claim 7, characterized in that,

The TAU request relocation includes an indication message; or, the indication message is carried in the context response sent by the first MME to the second MME in the TAU process;

The indication message is used to instruct the second MME to select the original SGW to provide services for the UE in the TAU process.

9. A mobility management method, characterized by including:

The user equipment UE determines that the current state is the idle state;

The UE determines that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE; wherein the second access network node is a node currently providing services to the UE;

The UE sends a tracking area update TAU request to the second access network node, so that the second access network node initiates a TAU process according to the TAU request.

10. A mobility management method, characterized by including:

The second access network node determines that the S 1 -AP connection for the user equipment UE on the dynamic S 1 connection established by the second access network node and the first mobility management entity MME has been released, then the second access network node The network access node interprets and releases the dynamic S1 connection established with the first MME; or,

The second access network node determines that the S 1 -AP connections of all UEs on the dynamic S 1 connection established by the second access network node and the first MME have been released, then the second access network node The network access node releases the dynamic S 1 connection established with the first MME.

11. A second access network node, characterized in that it is applied to the evolved packet system EPS, the EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UE, and the at least Each of the two access network nodes establishes a static S1 connection with any one of the at least two MMEs in advance;

Wherein, the at least two MMEs include a -th MME and a second MME, the -th MME is the MME currently providing services to the UE, and the second MME has been established with the second access network node in advance. The static S1 connection; and the at least two access network nodes include a first access network node and the second access network node, and the cell to which the UE is currently attached is the first access network The cell covered by the node, the cell covered by the first access network node is adjacent to at least one cell covered by the second access network node, the first access network node and the second access network node Pre-establish X2 connection;

A receiving unit configured to receive a message from the first access network node when the UE moves from a cell covered by the first access network node to a cell covered by the second access network node. A handover request sent over the X2 connection;

A sending unit, configured to send a handover request confirmation to the first access network node through the X2 connection, so that the first access network node and the second access network node execute the handover execution process;

A determining unit, used to determine the need to establish a dynamic S 1 connection with the first MME; An establishment unit, used to establish the dynamic S 1 connection with the first MME; An initiating unit, used to establish the dynamic S 1 connection with the first MME The dynamic S1 connection initiates a path switching procedure to the first MME.

12. The second access network node according to claim 11, wherein the determining unit is further configured to determine that it is not necessary to establish the dynamic S1 connection with the first MME; wherein, the The dynamic S 1 connection has been established between the second access network node and the first MME;

The initiating unit is further configured to initiate the path switching process to the first MME through the dynamic S 1 connection.

13. The second access network node according to claim 11 or 12, characterized in that the handover request carries the globally unique MME identifier GUMMEI of the first MME;

The determining unit is further configured to determine, according to the GUMMEI carried in the handover request, that the MME currently serving the UE is the first MME before determining that a dynamic S 1 connection needs to be established with the first MME. MME;

The determination unit is specifically used for:

According to the GUMMEI carried in the handover request, it is determined that the first MME is different from the second MME, then it is determined that the dynamic S1 connection needs to be established with the first MME; or, according to the handover request, The carried GUMMEI determines that the -th MME is different from the second MME, and it is determined that the second access network node and the first MME have not established the dynamic S1 connection, then it is determined that the dynamic S1 connection needs to be established with the first MME. The first MME establishes the dynamic S 1 connection;

The determining unit is specifically configured to determine that the first MME is different from the second MME according to the GUMMEI carried in the handover request, and determine that the first MME is different from the second MME. If the second access network node has established the dynamic S1 connection with the first MME, it is determined that there is no need to establish the dynamic S1 connection with the first MME.

14. The second access network node according to any one of claims 11-13, characterized in that the establishment unit includes:

A sending module, configured to send an S1 connection establishment request to the first MME; and a receiving module, configured to receive an S1 connection establishment response sent by the first MME.

15. The second access network node according to any one of claims 11-14, characterized in that,

In the path switching process initiated by the initiating unit to the first MME, the first MME selects the original serving gateway SGW to provide services for the UE; the original SGW is the SGW currently providing services for the UE. .

16. The second access network node according to any one of claims 11-15, characterized in that,

The receiving unit is further configured to receive a tracking area update TAU request sent by the UE after the initiating unit initiates a path switching process to the first MME through the dynamic S1 connection; wherein, the TAU request is The UE is sent after determining that the current state is an idle state and determining that the received tracking area identifier broadcast by the second access network node is not in the tracking area list of the UE;

The sending unit is also configured to send the TAU request to the second MME through the static S1 connection, so that the second MME initiates a TAU process according to the TAU request.

17. The second access network node according to any one of claims 11-15, characterized in that,

The receiving unit is further configured to receive a TAU request relocation sent by the first MME through the dynamic S1 connection after the initiating unit initiates a path switching process to the first MME through the dynamic S1 connection; Wherein, the TAU request relocation is when the first MME receives the TAU request sent by the UE through the second access network node, and determines the second access network node where the UE is located. The tracking area identifier of the covered cell is not sent in the tracking area managed by the first MME. Sent, the TAU request relocation carries the TAU request;

The sending unit is also configured to send the TAU request carried in the TAU request relocation to the second MME through the static S1 connection, so that the second MME initiates TAU according to the TAU request. process.

18. The second access network node according to claim 17, characterized in that: the TAU request for relocation includes an indication message; or, the indication message is carried in the first MME in the TAU process In the context response sent to the second MME;

The indication message is used to instruct the second MME to select the original SGW to provide services for the UE in the TAU process.

19. A user equipment UE, characterized in that it includes:

Determination unit, used to determine that the current state is idle;

The determining unit is further configured to determine that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE; wherein, the second access network node is currently providing the tracking area identifier for the UE. service node;

A sending unit, configured to send a tracking area update TAU request to the second access network node, so that the second access network node initiates a TAU process according to the TAU request.

20. A second access network node, characterized by: including:

Determining unit, configured to determine that the S 1 -AP connection for the user equipment UE on the dynamic S 1 connection established by the second access network node and the first mobility management entity MME has been released, then the second access The network node interprets and releases the dynamic S1 connection established with the first MME; or,

The determining unit is also configured to determine that the S 1 -AP connections of all UEs on the dynamic S 1 connection established by the second access network node and the first MME have been released, then the second access network node The access network node interprets the dynamic S1 connection established with the first MME.

21. A second access network node, characterized in that it is applied to the evolved packet system EPS, the EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UE, and the at least Each of the two access network nodes The network access node establishes a static S1 connection with any one of the at least two MMEs in advance;

Wherein, the at least two MMEs include a -th MME and a second MME, the -th MME is the MME currently providing services to the UE, and the second MME has been established with the second access network node in advance. The static S1 connection; and the at least two access network nodes include a first access network node and the second access network node, and the cell to which the UE is currently attached is the first access network The cell covered by the node, the cell covered by the first access network node is adjacent to at least one cell covered by the second access network node, the first access network node and the second access network node Pre-establish X2 connection;

A receiver configured to receive, when the UE moves from a cell covered by the first access network node to a cell covered by the second access network node, that the first access network node connects through the X2 The switching request sent;

A transmitter, configured to send a handover request confirmation to the first access network node through the X2 connection, so that the first access network node and the second access network node execute the handover execution process;

A processor configured to determine that a dynamic S 1 connection needs to be established with the first MME, establish the dynamic S 1 connection with the first MME, and initiate a path to the first MME through the dynamic S 1 connection. Switch process.

22. The second access network node according to claim 21, wherein the processor is further configured to determine that it is not necessary to establish the dynamic relationship with the first MME.

S1 connection; wherein, the second access network node and the first MME have established the dynamic S1 connection; and the path switching process is initiated to the first MME through the dynamic S1 connection.

23. The second access network node according to claim 21 or 22, wherein the handover request carries the globally unique MME identifier GUMMEI of the first MME;

The processor is further configured to determine, according to the GUMMEI carried in the handover request, that the MME currently serving the UE is the first MME before determining that a dynamic S 1 connection needs to be established with the first MME. MME; The processor is specifically configured to operate according to the information carried in the handover request.

If the GUMMEI determines that the first MME is different from the second MME, it determines that the dynamic S1 connection needs to be established with the first MME; or, determines that the first MME needs to be established according to the GUMMEI carried in the handover request. The MME is different from the second MME, and it is determined that the second access network node has not established the dynamic S1 connection with the first MME, then it is determined that the dynamic S1 connection needs to be established with the first MME. ;

The processor is specifically configured to determine that the first MME and the second MME are different according to the GUMMEI carried in the handover request, and determine that the second access network node and the first MME have If the dynamic S 1 connection is established, it is determined that there is no need to establish the dynamic S 1 connection with the first MME.

24. The second access network node according to any one of claims 21 to 23, characterized in that,

The sender is further configured to send an S 1 connection establishment request to the first MME; the receiver is further configured to receive an S 1 connection establishment response sent by the first MME.

25. The second access network node according to any one of claims 21 to 24, characterized in that,

In the path switching process initiated by the processor to the first MME, the first MME selects the original serving gateway SGW to provide services for the UE; the original SGW is the SGW currently providing services for the UE. .

26. The second access network node according to any one of claims 21 to 25, characterized in that,

The receiver is further configured to receive a tracking area update TAU request sent by the UE after the processor initiates a path switching process to the first MME through the dynamic S1 connection; wherein, the TAU request It is sent by the UE after determining that the current state is an idle state and determining that the received tracking area identifier broadcast by the second access network node is not in the tracking area list of the UE;

The sender is also configured to send the TAU request to the second MME through the static S1 connection, so that the second MME initiates TAU according to the TAU request. process.

27. The second access network node according to any one of claims 21 to 25, characterized in that,

The receiver is further configured to, after the processor initiates a path switching process to the first MME through the dynamic S1 connection, receive a TAU request re-sent by the first MME through the dynamic S1 connection. Positioning; wherein, the TAU request relocation is when the first MME receives the TAU request sent by the UE through the second access network node and determines the second access where the UE is located. The tracking area identifier of the cell covered by the network node is sent after it is not in the tracking area managed by the first MME, and the TAU request relocation carries the TAU request;

The sender is also configured to send the TAU request carried in the TAU request relocation to the second MME through the static S1 connection, so that the second MME initiates a TAU request according to the TAU request. process.

28. The second access network node according to claim 27, characterized in that: the TAU request for relocation includes an indication message; or, the indication message is carried in the first MME in the TAU process In the context response sent to the second MME;

The indication message is used to instruct the second MME to select the original SGW to provide services for the UE in the TAU process.

29. A user equipment UE, characterized by: including:

The processor is configured to determine that the current state is an idle state; determine that the received tracking area identifier sent by the second access network node is not in the tracking area list of the UE; wherein, the second access network node is The node currently providing services to the UE;

A sender, configured to send a tracking area update TAU request to the second access network node, so that the second access network node initiates a TAU process according to the TAU request.

30. A second access network node, characterized by: including:

Processor, configured to determine that the S 1 -AP connection for the user equipment UE on the dynamic S 1 connection established by the second access network node and the first mobility management entity MME has been released, then the second access network node The network node interprets the dynamic information established with the first MME. SI connection; or, it is determined that the S1-AP connections of all UEs on the dynamic S1 connection established by the second access network node and the first MME have been released, then the second access network node releases The dynamic S1 connection established with the first MME.

31. An evolved packet system EPS, characterized in that the EPS includes at least two mobility management entities MME, at least two access network nodes, and user equipment UE, each of the at least two access network nodes Each of the access network nodes has previously established a static S1 connection with any one of the at least two MMEs;

Wherein, the at least two MMEs include a -th MME and a second MME, the -th MME is the MME currently providing services to the UE, and the second MME has established the MME with the second access network node in advance. Static S1 connection; and the at least two access network nodes include a first access network node and the second access network node, and the cell to which the UE is currently attached is covered by the first access network node. Cell, the cell covered by the first access network node is adjacent to at least one cell covered by the second access network node, and the first access network node and the second access network node have pre-established X2 connect.