CN114079981B

CN114079981B - Network equipment switching method and network equipment

Info

Publication number: CN114079981B
Application number: CN202010783544.5A
Authority: CN
Inventors: 孙立新; 李娜; 孙玉飞
Original assignee: Baicells Technologies Co Ltd
Current assignee: Baicells Technologies Co Ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2024-02-02
Anticipated expiration: 2040-08-06
Also published as: CN114079981A

Abstract

The invention provides a network device switching method and network device. The method is applied to a first network device and comprises the following steps: acquiring a network equipment switching request message aiming at a terminal; according to the network equipment switching request message, an address resolution protocol ARP updating request is sent to an NAT gateway; the update request includes: the updated media access control MAC address corresponding to the original IP address of the terminal, or the mapping relation between the updated IP address of the terminal and the public network IP. Based on the mapping rule of the NAT gateway, the embodiment of the invention realizes the switching between core networks, namely the switching of a session anchor point SGW, by updating the mapping table of the IP and the MAC in the NAT gateway or the mapping table of the private network IP and the public network IP during switching, thereby realizing uninterrupted service and overcoming the problem that the network switching can be completed only by interrupting the service due to the change of the core network.

Description

Network equipment switching method and network equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a network device switching method and a network device.

Background

A mobile communication network is composed of a base station and a core network, for example, haloB devices, and is a base station with a light-weight core network capability aggregated, i.e., the core network capability and the base station capability are localized, and necessary core network capabilities, such as attachment of user equipment, signaling transmission, control, and the like, are provided in addition to the capability of the base station. Since the base station and the core network are both disposed on the same device, by default, the eNB on each device interacts with the mobility management function (Mobility Management Entity, MME) entity on the device, and establishes a bearer with a Serving GateWay (SGW) of the device, so as to provide connection service for User Equipment (UE). When the UE moves from one HaloB device to another HaloB device, a session anchor point is switched, i.e. the current service is interrupted, and the reattachment connection is performed.

Disclosure of Invention

The invention provides a network device switching method and network device, which are used for solving the problem of service interruption during network device switching.

The embodiment of the invention provides a network equipment switching method, which comprises the following steps:

acquiring a network equipment switching request message aiming at a terminal;

transmitting an address resolution protocol (Address Resolution Protocol, ARP) update request to a network address resolution protocol (Network Address Translation, NET) gateway according to the network device handover request message;

the update request includes: an updated media access control (Media Access Control, MAC) address corresponding to the original internet protocol (Internet Protocol, IP) address of the terminal, or a mapping relationship of the updated IP address of the terminal and the public network IP.

Optionally, the acquiring the network device handover request message for the terminal includes:

receiving a switching request message sent by second network equipment, wherein the switching request message comprises the following components: original transmission path information of the terminal;

and generating updated path information for switching according to the switching request message.

Optionally, the receiving a handover request message sent by the second network device includes:

Receiving a first handover request message sent by a second base station of a second network device, the first handover request message comprising: address information of a second MME of a second network device, first bearer information of a target bearer of the terminal, and first security information;

the generating updated path information for handover according to the handover request message includes:

generating second bearing information and second safety information according to the first switching request message;

and generating a downlink endpoint number of the S1 tunnel and a downlink endpoint number of the X2 tunnel for switching.

Optionally, the method further comprises:

sending a context acquisition request of a terminal to a second MME of the second network equipment;

receiving a context message of a terminal sent by the second MME, wherein the context message comprises: the international mobile subscriber identity IMSI of the terminal and the first IP address of the terminal.

Optionally, the method further comprises:

transmitting a first response message to the second base station, the first response message comprising: and the downlink endpoint number of the X2 tunnel and the second bearer information.

Optionally, after the acquiring the network device handover request message for the terminal, the method further includes:

And creating a session between the first base station of the first network device and the first service gateway SGW of the first network device according to the context message, the downlink endpoint number of the S1 tunnel and the second bearer information.

generating an uplink endpoint number of the S1 tunnel and an S1 bearer;

and establishing a mapping relation between the second bearer and the S1 bearer according to the context message and the uplink endpoint number of the S1 tunnel.

Optionally, after acquiring the network device handover request message for the terminal, the method further includes:

configuring a second IP address for the terminal;

generating an uplink endpoint number of the S1 tunnel and an S1 bearer;

and establishing a mapping relation between a second bearer and an S1 bearer according to the context message, the uplink endpoint number of the S1 tunnel and the second IP address.

Optionally, the method further comprises:

and sending an IP address update indication to the terminal, wherein the IP address update indication comprises the second IP address.

receiving a second handover request message sent by a second MME of a second network device, the second handover request message comprising: a context message of a terminal, the context message comprising: the method comprises the steps of carrying first bearing information, first safety information and a first IP address of a terminal of a target bearing of the terminal, wherein the first bearing information, the first safety information and an International Mobile Subscriber Identity (IMSI) of the terminal are carried out;

generating an uplink endpoint number of the S1 tunnel according to the second switching request message;

generating second bearing information and second safety information according to the second switching request message and the uplink endpoint number of the S1 tunnel;

and generating a downlink endpoint number of the S1 tunnel and a downlink endpoint number of the X2 tunnel.

Optionally, the method further comprises:

and creating a session between the first base station of the first network device and the first SGW of the first network device according to the context message and the second bearer information.

Optionally, the method further comprises:

sending a second response message to the second MME, the second response message including: the second bearer information, the second security information, the downstream endpoint number of the X2 tunnel and the first indication message;

the first indication message is used for indicating: and the second base station of the second network equipment establishes an X2 tunnel with the first base station of the first network equipment, and instructs the second base station to perform X2 tunnel switching.

Optionally, the method further comprises:

and controlling a first MME of the first network equipment to send a bearing modification message to a first SGW of the first network equipment, wherein the bearing modification message carries a downlink tunnel identifier of the terminal.

Optionally, the sending an address resolution protocol ARP update request to the NAT gateway according to the network device handover request message includes:

sending a first mapping relation update request of the IP address and the MAC of the terminal to the NAT gateway;

the first mapping relation update request is used for indicating: and updating the MAC address of the second SGW in the second network equipment mapped by the first IP address of the terminal to the MAC address of the first SGW of the first network equipment.

Optionally, the method further comprises:

configuring a second IP address for the terminal;

sending a second mapping relation update request of the IP address of the terminal and the public network IP to the NAT gateway;

the second mapping relation update request is used for indicating: and updating the mapping relation between the first IP address of the terminal and the public network IP to the mapping relation between the second IP address and the public network IP.

Optionally, the method further comprises:

and sending an indication message for releasing the terminal to the second network equipment.

The embodiment of the invention also provides a second network device, which comprises:

a network device switching request message aiming at a terminal is sent to a first network device, so that the first network device sends an Address Resolution Protocol (ARP) updating request to a NAT gateway according to the network device switching request message;

the update request includes: the updated media access control MAC address corresponding to the original IP address of the terminal, or the mapping relation between the updated IP address of the terminal and the public network IP.

Optionally, before sending the network device handover request message for the terminal to the first network device, the method further comprises:

a target communication device to be handed over is selected according to a list of switchable communication devices configured by an operation and maintenance center (Operation and Maintenance Center, OMC), the target communication device being a first communication device.

Optionally, the sending a network device handover request message for the terminal to the first network device includes:

transmitting a handover request message to a first network device, the handover request message comprising: and the original transmission path information of the terminal is used for enabling the first network equipment to generate updated path information for switching according to the switching request message.

Optionally, sending a handover request message to the first network device includes:

transmitting, by a second base station of the second network device, a first handover request message to the first network device, the first handover request message including: address information of a second MME of a second network device, first bearer information of a target bearer of the terminal, and first security information.

Optionally, the method further comprises:

receiving a context acquisition request of a terminal sent by the first network equipment through a second MME;

transmitting a context message of the terminal to the first network device, the context message comprising: an international mobile subscriber identity (International Mobile Subscriber Identity, IMSI) of the terminal and a first IP address of the terminal.

Optionally, the method further comprises:

receiving, by the second base station, a first response message sent by the first network device, where the first response message includes: and the downstream endpoint number of the X2 tunnel and the second bearing information.

Optionally, the sending a handover request message to the first network device includes:

transmitting a second handover request message to a second MME of the second network device through a second base station of the second network device;

Transmitting the second handover request message to the first network device, the second handover request message including: a context message of a terminal, the context message comprising: the terminal comprises first bearing information of target bearing of the terminal, first safety information, an International Mobile Subscriber Identity (IMSI) of the terminal and a first IP address of the terminal.

Optionally, the method further comprises:

receiving, by the second MME, a second response message sent by the first network device, where the second response message includes: the second bearer information, the second security information, the downstream endpoint number of the X2 tunnel and the first indication message;

transmitting the first indication message to the second base station;

the first indication message is used for indicating: and the second base station establishes an X2 tunnel with the first base station of the first network equipment and instructs the second base station to perform X2 tunnel switching.

Optionally, the method further comprises:

receiving an indication message for releasing the terminal;

and deleting the session with the terminal according to the indication message.

Optionally, after deleting the session with the terminal according to the indication message, the method further comprises:

and reserving the preset duration of the first IP address which is not allocated to the terminal.

The embodiment of the invention also provides a network device, which is a first network device, comprising:

the first acquisition module is used for acquiring a network equipment switching request message aiming at the terminal;

the first sending module is used for sending an Address Resolution Protocol (ARP) update request to the NAT gateway according to the network equipment switching request message;

The embodiment of the invention also provides a network device, which is a second network device, comprising:

the second sending module is used for sending a network equipment switching request message aiming at the terminal to the first network equipment so that the first network equipment sends an Address Resolution Protocol (ARP) updating request to the NAT gateway according to the network equipment switching request message;

The embodiment of the invention also provides a network device, which is a first network device, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of:

Acquiring a network equipment switching request message aiming at a terminal;

according to the network equipment switching request message, an address resolution protocol ARP updating request is sent to an NAT gateway;

The embodiment of the invention also provides a network device, which is a second network device, comprising: a transceiver, a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of:

The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, which when being executed by a processor, implements the steps of the handover method between network devices described above.

The technical scheme of the invention has the beneficial effects that: based on the mapping rule of the NAT gateway, when switching, the switching between core networks, namely the switching of a session anchor point SGW, is realized by updating the mapping table of IP and MAC in the NAT gateway or the mapping table of private network IP and public network IP, so that the problem that the network switching can be completed only by interrupting the service due to the change of the core network is solved.

Drawings

Fig. 1 shows a schematic structural diagram of a HaloB device;

fig. 2 is a schematic flow chart of a handover method between network devices according to an embodiment of the present invention;

fig. 3 shows a second flowchart of a handover method between network devices according to an embodiment of the present invention;

fig. 4 shows a third flowchart of a handover method between network devices according to an embodiment of the present invention;

fig. 5 shows a fourth flowchart of a handover method between network devices according to an embodiment of the present invention;

fig. 6 shows a fifth flowchart of a handover method between network devices according to an embodiment of the present invention;

fig. 7 is a flowchart illustrating a handover method between network devices according to an embodiment of the present invention;

FIG. 8 is a schematic block diagram of a first network device according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a second network device according to an embodiment of the present invention;

fig. 10 is a schematic diagram of an implementation structure of a first network device according to an embodiment of the present invention;

fig. 11 is a schematic diagram of an implementation structure of a second network device according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided merely to facilitate a thorough understanding of embodiments of the invention. It will therefore be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

In addition, the terms "system" and "network" are often used interchangeably herein.

In the examples provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B may be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.

In the embodiment of the invention, the form of the access network is not limited, and the access network may be an access network including a macro base station (Macro Base Station), a micro base station (Pico Base Station), a Node B (3G mobile base station name), an enhanced base station (eNB), a Home enhanced base station (Femto eNB or Home eNode B or Home eNB or HeNB), a relay station, an access point, an RRU (Remote Radio Unit, a remote radio module), an RRH (Remote Radio Head, a remote radio head), and the like. The user terminal may be a mobile phone (or handset), or other device capable of transmitting or receiving wireless signals, including user equipment, personal Digital Assistant (PDA), wireless modem, wireless communicator, handheld device, laptop, cordless phone, wireless Local Loop (WLL) station, CPE (Customer Premise Equipment, client terminal) or mobile smart hot spot capable of converting mobile signals to WiFi signals, smart home appliances, or other devices capable of spontaneously communicating with a mobile communication network without manipulation by a person, etc.

In describing embodiments of the present invention, some concepts used in the following description are first explained.

HaloB：

The mobile communication network is composed of a base station and a core network, as shown in fig. 1.HaloB devices are base stations that aggregate lightweight core network capabilities, i.e., localize both core network and base station capabilities, which provide the necessary core network capabilities, such as attachment of user equipment, signaling, control, etc., in addition to the capabilities of the base station.

When the initial user equipment is attached to the HaloB, the HaloB interacts with the remote management center to acquire the subscription information of the equipment, and the subscription information is stored locally, so that when the equipment is attached again, verification, authorization and the like of local subscription data are realized, and meanwhile, when the remote core network fails, the user of the local stored subscription information can be prevented from being influenced by the remote core network and can be normally attached to the network for communication and the like.

Mobility anchor:

the UE moves (intra-cell handover) in different sectors of the same eNB, and the accessed eNB is unchanged (at least eNB with the same ID), which is called mobility anchor in this scenario.

UE switches between different enbs under the same MME jurisdiction (inter-cell handover), then the accessed eNB changes, but the MME accessing the service does not change, so in this scenario, the MME is the mobility anchor.

Session anchor point:

a PDN GateWay (PGW) is a functional entity that allocates an IP address to a UE, and is also a session anchor during the UE's presence. When the UE is switched between different eNBs and MMEs, the session anchor point is kept unchanged, otherwise, the service is interrupted. The SGW and PGW may be set as one entity. In the HaloB application scenario, the SGW and PGW are collectively referred to as SGW, and there is one SGW in each HaloB to provide session anchor for the UE under the present HaloB.

And (3) switching:

the handover includes an X2-based handover and an S1-based handover.

The X2 handover refers to that a direct X2 interface exists between two enbs, and data during handover can be forwarded to the other party through the X2 interface, and meanwhile, the two enbs are required to be under the jurisdiction of one MME, that is, the two enbs are connected with the same MME.

The S1 handover refers to that the UE has no direct connection of an X2 interface between two enbs where handover occurs, and needs to forward control signaling by the MME through the S1 interface between the enbs and the MME, and simultaneously establish a non-indirect handover forwarding tunnel to forward handover data to the target eNB.

And (3) tunnel establishment:

an evolved packet system (Evolved Packet System, EPS) bearer in mobile communication includes a bearer DRB (Data Radio Bearer ) on the radio side, an S1 bearer between an eNB and an SGW, and an S5/S8 bearer between an SGW and a PGW. The radio side bearer and the S1 bearer are collectively referred to as an evolved radio access bearer (Evolved Radio Access Bearer, E-RAB). The bearers in the EPS bearer are in one-to-one correspondence. The establishment of the S1 bearer and the S5/S8 bearer is based on GTP-U (GPRS Tunnelling Protocol, GPRS tunneling protocol), and comprises the steps of creating end point numbers at two ends of the bearer, combining IP addresses of the end points, and sending the IP addresses to the opposite ends as an addressing mechanism of a tunnel. The basis for tunnel establishment is thus that the tunnel end points are aware of the tunnel end point identification, i.e. the identification number (Tunnel Endpoint Identifier, TEID), and the IP address of the end point. The following scheme refers to TEID, but IP address information is included therein by default.

NAT (Network Address Translation ): the NAT gateway converts the internal private network IP address into a public network IP address so as to solve the problem of IP address limitation.

ARP (Address Resolution Protocol ):

the address resolution protocol is a transmission control protocol (Transmission Control Protocol, TCP)/IP protocol that obtains a physical address from an IP address. Broadcasting an ARP request containing a target IP address to all hosts on a local area network when the hosts send information, and receiving a return message so as to determine the physical address of the target; after receiving the return message, the IP address and the physical address are stored in the local ARP cache and kept for a certain time, and the ARP cache is directly inquired when the request is next time so as to save resources. And the switch judges the equipment corresponding to the MAC address of the next hop according to the IP address of the received data packet and the stored IP and MAC mapping table, and forwards the packet to the equipment.

As shown in fig. 2, an embodiment of the present invention provides a network device switching method, which is applied to a first network device, and includes:

step 201, a network device switching request message for a terminal is acquired.

The first network device is a target network device to be switched by a terminal, and may be a target HaloB, including a target eNB, a target MME, and a target SGW. The network device handover request message may be sent by a second network device (i.e. a source network device to which the terminal is connected, such as a source HaloB, including a source eNB, a source MME, a source SGW), and the network device handover request message may carry multiple messages of a base station, an MME, a bearer, etc. of the second network device to which the terminal is currently connected. The first network device acquires the network device switching request message, and considers that the terminal has the intention of switching the network device.

The OMC is a unified management system, a neighbor network device list capable of being switched is configured for all network devices, and when the terminal is switched, the eNB or the MME of the source network device selects the target network device to be switched according to the switchable network device list configured by the OMC.

Step 202, according to the network device switching request message, an address resolution protocol ARP update request is sent to an NAT gateway; the update request includes: the updated media access control MAC address corresponding to the original IP address of the terminal, or the mapping relation between the updated IP address of the terminal and the public network IP.

And the first network equipment switches the service transmission between the terminal and the second network equipment to the first network equipment according to the network equipment switching request message, and sends an Address Resolution Protocol (ARP) updating request to the NAT gateway to change the mapping rule of the NAT gateway. Wherein, the update request may include: the updated media access control MAC address corresponding to the original IP address of the terminal, namely the IP address of the terminal is kept unchanged, a mapping table of the IP address and the MAC of the terminal in the NAT gateway is changed, and the source SGW MAC address corresponding to the IP address is updated to the MAC of the target SGW; alternatively, the update request may include: the mapping relation between the updated IP address of the terminal and the public network IP, namely the IP address of the terminal is changed, the updated IP address is sent to the NET gateway, and the mapping table of the private network IP and the public network IP in the NET gateway is updated.

The embodiment of the invention realizes the switching between core networks, namely the switching of a session anchor point SGW, based on the mapping rule of the NAT gateway, by updating the mapping table of the IP and the MAC in the NAT gateway or the mapping table of the private network IP and the public network IP during switching, thereby realizing uninterrupted service and overcoming the problem that the network switching can be completed only by interrupting the service due to the change of the core network.

Optionally, the acquiring the network device handover request message for the terminal includes: receiving a switching request message sent by second network equipment, wherein the switching request message comprises the following components: original transmission path information of the terminal; and generating updated path information for switching according to the switching request message.

In this embodiment, the second network device is a source network device to which the terminal is currently connected. And when the second network equipment is to be switched to the first network equipment, sending a switching request message to the first network equipment, wherein the switching request message comprises the original transmission path information of the terminal. Specifically, the original transmission path information may include, but is not limited to, the following information: information of a second MME of a second network device: the address information of the MME may be address information of the MME, ID information or domain name information of the MME, or the like; the bearing information to be switched can be the bearing information of the current bearing service or part or all of the bearing information of the terminal; security information such as key information; SGW information in the second network device, etc.; the original transmission path information may further include: context messages of the terminal, such as: IMSI, IP address, etc. of the terminal.

And the first network equipment generates updated path information for switching according to the message content carried in the switching request message, namely generates new security information, bearing information, tunnel endpoint number, new IP address of the terminal and the like.

Specifically, when the network device is switched, the IP address of the terminal may be changed, or the IP address of the terminal may not be changed, or the switching may be performed based on the X2 interface or the switching may be performed based on the X2 and S1 interfaces, which will be described below through specific embodiments.

Mode one: switching based on X2 interface:

further, the receiving the handover request message sent by the second network device includes: receiving a first handover request message sent by a second base station of a second network device, the first handover request message comprising: address information of a second MME of a second network device, first bearer information of a target bearer of the terminal, and first security information.

The address information of the second MME may be: the address information of the MME of the second network device may be ID information or domain name information of the MME. The target bearer of the terminal refers to a bearer that needs to be switched, and the first bearer information refers to bearer information of a current bearer service, for example: the current UE has 3 bearers, namely bearer 1, bearer 2 and bearer 3, where bearer 1 is a default bearer, bearer 2 and bearer 3 are dedicated bearers, and at this time, there is a service in progress on bearer 2, and when the second base station of the second network device sends the first handover request message, only the information of bearer 2 needs to be handed over, and the other bearers may not need to be carried. It should be noted that, the first handover request message may also include information of the bearer 2 and the bearer 1 to perform handover, or carry 3 bearer information to perform handover, and the second base station needs to have a capability of distinguishing different bearers. The first security information is security information carried in a first handover request message sent by the second base station, and may be encryption information, such as a key, on an air interface side.

The generating updated path information for handover according to the handover request message includes: generating second bearing information and second safety information according to the first switching request message; and generating a downlink endpoint number of the S1 tunnel and a downlink endpoint number of the X2 tunnel for switching.

After receiving the first switching request message, the first base station of the first network device generates new second security information according to the first security information carried in the message, and knows the address of the uplink path source SGW (i.e. the address of the second SGW of the second network device) according to the first bearer information carried in the first switching request message, and allocates a new radio bearer ID or IDs. And the first base station simultaneously generates end point numbers of the X2 tunnel and the S1 tunnel, namely the X2-TEID and the S1-TEID, and the end point numbers of the X2 tunnel and the S1 tunnel are the same as the bearing number.

In this embodiment, when switching between two network devices, only the currently used bearer may be switched, and the unused bearer may not be switched; the base station is required to have the capability of identifying different bearers, such as identifying which bearer belongs to the current service bearer, and which bearer is the default bearer.

The method further comprises the steps of: transmitting a first response message to the second base station, the first response message comprising: and the downlink endpoint number of the X2 tunnel and the second bearer information. And the first base station sends a response message to the second base station and carries the corresponding carried related information and the endpoint number of the X2 tunnel.

The method may further comprise: sending a context acquisition request of a terminal to a second MME of the second network equipment; receiving a context message of a terminal sent by the second MME, wherein the context message comprises: the international mobile subscriber identity IMSI of the terminal and the first IP address of the terminal.

In this embodiment, the first base station sends a path switching request to the first MME, and carries information of a bearer to be switched, including an endpoint number of an S1 tunnel, and may further include information for uniquely identifying a terminal in a second MME in the second network device, for example: ID information of the S1AP of the second MME and the terminal, and information of the second MM. The first MME finds a second MME according to the information of the second MME, and sends a context acquisition request of the terminal to the second MME, wherein the context acquisition request carries information which can uniquely identify the context of the terminal, such as S1AP ID of the second MME and the UE.

After the network device handover request message for the terminal is acquired, the method further includes: and establishing a session between the first base station of the first network device and the first SGW of the first network device according to the context message, the downlink endpoint number of the S1 tunnel and the second bearer information.

The second MME sends a context message of a terminal to the first MME, and after the first MME receives the context message of the terminal, the first MME initiates a request for creating a session to a first SGW of the first network equipment, and simultaneously carries an IMSI of the UE, an IP address of the UE, a downlink endpoint number of an S1 tunnel allocated by the first base station, second bearing information, a switching instruction and the like, and the first MME initiates the session between the first base station and the first SGW.

After the first SGW receives the network device handover request message, the IP address may not be allocated to the terminal any more, that is, the IP address in the network device handover request message may be continuously used. Optionally, the method further comprises: generating an uplink endpoint number of the S1 tunnel and an S1 bearer; and establishing a mapping relation between the second bearer and the S1 bearer according to the context message and the uplink endpoint number of the S1 tunnel.

The embodiment is an implementation process when the IP address of the UE is not changed, the first SGW generates an uplink endpoint number of the S1 tunnel and an S1 bearer (i.e., a bearer between the first base station and the first SGW), the uplink endpoint number of the S1 tunnel is the same as the number of bearers, the first MME sends the uplink endpoint number of the S1 tunnel to the first base station, and includes the IMSI of the terminal at the same time, and the first base station establishes a mapping relationship between the second bearer and the S1 bearer, so that the first base station maps the bearers and the UE one by one. Wherein the second bearer is a new radio bearer generated by the first base station according to the first bearer.

Optionally, the sending an address resolution protocol ARP update request to the NAT gateway according to the network device handover request message includes: sending a first mapping relation update request of the IP address and the MAC of the terminal to the NAT gateway; the first mapping relation update request is used for indicating: and updating the MAC address of the second SGW in the second network equipment mapped by the first IP address of the terminal to the MAC address of the first SGW of the first network equipment.

And the first SGW sends an IP and MAC mapping relation update request to the NAT gateway, namely the first mapping relation update request, and updates a second SGW MAC address mapped by the IP address of the UE into the first SGW MAC address.

The method further comprises the steps of: and sending an indication message for releasing the terminal to the second network equipment. After the handover is completed, the first base station instructs a second base station to release the relevant information of the terminal, and meanwhile, the second base station sends a release message to the second MME, and the second MME and the second SGW delete the session of the local UE. The second SGW reserves an IP address of the terminal for a time that may be preset in advance or indicated by the target network so as not to cause collision with the terminal due to reassignment.

The above is the case where the IP address of the terminal is not changed. Optionally, after receiving the network device handover request message, the first SGW may allocate a new IP address to the terminal, that is, change the IP address of the terminal when switching network devices. Optionally, the method further comprises: configuring a second IP address for the terminal; generating an uplink endpoint number of the S1 tunnel and an S1 bearer; and establishing a mapping relation between a second bearer and an S1 bearer according to the context message, the uplink endpoint number of the S1 tunnel and the second IP address.

The embodiment is an implementation process when changing the IP address of the UE, after the first SGW receives the network device handover request message, the first SGW reserves the source IP address of the UE, that is, the first IP address, and allocates a new IP address to the UE at the same time, and creates an uplink endpoint number and an S1 bearer of the S1 tunnel at the same time, where the uplink endpoint number and the bearer number of the S1 tunnel are the same, and the uplink endpoint number and the bearer number are sent to the first base station by the first MME and include the IMSI of the UE at the same time. The first base station establishes a mapping relation between the second bearing and the S1 bearing, so that the first base station can conveniently map the bearing and the UE one by one. Wherein the second bearer is a new radio bearer generated by the first base station according to the first bearer.

The method further comprises the steps of: and sending an IP address update indication to the terminal, wherein the IP address update indication comprises the second IP address. The first base station sends a message for updating the IP address to the terminal, and carries the updated second IP address, and can also carry an original IP address (namely the first IP address) and/or an address replacement instruction.

Further, the sending, according to the network device handover request message, an address resolution protocol ARP update request to a NAT gateway includes: sending a second mapping relation update request of the IP address of the terminal and the public network IP to the NAT gateway; the second mapping relation update request is used for indicating: and updating the mapping relation between the first IP address of the terminal and the public network IP to the mapping relation between the second IP address and the public network IP. And the first SGW sends a message for updating the mapping relation to the NAT gateway, namely the second mapping relation updating request carries the first IP address of the UE, the updated second IP address and the replacement mapping instruction.

After the handover is completed, the method further comprises: and sending an indication message for releasing the terminal to the second network equipment. After the handover is completed, the first base station instructs the second base station to release the relevant information of the terminal, and meanwhile, the second base station sends a release message to the second MME, and the second MME and the second SGW delete the session of the terminal locally.

The implementation process under the two conditions of not changing the IP address of the UE and changing the IP address of the UE when switching based on the X2 tunnel is described below by taking the first network device as the destination HaloB and the second network device as the source HaloB as an example. Wherein the destination HaloB comprises a destination eNB, a destination MME and a destination SGW; the source HaloB includes a source eNB, a source MME and a source SGW.

Example 1: based on the switching of the X2 tunnel, the IP address of the UE is not changed. As shown in fig. 3:

1): the OMC sets a neighbor cell HaloB device list capable of switching for all the HaloB devices;

2): when the UE performs switching, the source eNB selects an eNB of the target HaloB, namely a target eNB, according to the switchable HaloB equipment list configured by the OMC to perform X2 switching. Sending a Handover Request message to a target eNB and carrying information of a source MME; the Handover Request can also carry bearer information to be switched;

3): after receiving the Handover Request, the target eNB generates new security information according to the security information carried in the message, and knows the address of the uplink path source SGW according to the received bearer information, and allocates a new radio bearer ID or IDs. And simultaneously generating end point numbers of the X2 tunnel and the S1 tunnel, namely X2-TEID and S1-TEID.

4): the target eNB sends a response to the source eNB and carries the corresponding carried related information and the endpoint number of the X2 tunnel;

5): the target eNB sends a path switching request to a local MME and carries information of a bearer to be switched, wherein the information comprises an end point number of an S1 tunnel and the UE in a source MME can be uniquely identified; the local MME finds a source MME according to the source MME information, and sends a UE Context acquisition message to the source MME, carrying information which can uniquely identify the UE Context.

6): after the target MME, namely the local MME, acquires the UE Context, a request for creating a session is initiated to the local SGW, namely the target SGW, and the request carries the IMSI of the UE, the IP address of the UE, the S1 tunnel endpoint number distributed by the target eNB, bearing information, switching instructions and the like;

7): the target SGW receives the switching instruction in the message, does not allocate an IP address to the UE, continues to use the IP address in the message, creates S1 uplink tunnel endpoint numbers with the same number as the bearing number, sends the message to the target eNB by the target MME, and simultaneously comprises the IMSI of the UE, so that the target eNB can map the bearing number with the UE one by one. Meanwhile, an update request of the mapping relation between the IP and the MAC is sent to the NAT gateway, namely, the MAC address of the source SGW mapped by the IP address of the UE is updated to the MAC of the target SGW;

8): after the switching is completed, the target eNB instructs the source eNB to release the relevant information of the UE; simultaneously, the source eNB sends a release message to the local MME, and the local MME and the SGW delete the session of the local UE;

9): the source SGW reserves the IP address of the UE for a period of time so as not to cause collision with the UE due to reassignment.

Example 2: based on the switching of the X2 tunnel, the IP address of the UE is changed. As shown in fig. 4:

steps a to f of this example 2 are the same as or similar to steps 1 to 6 of the above example 1, and are not described here again;

g) The method comprises the following steps The target SGW receives the switching instruction in the message, reserves the source IP address of the UE, reassigns a new IP address for the UE, creates an S1 uplink tunnel endpoint number, sends the uplink tunnel endpoint number to the target eNB by the target MME, and simultaneously comprises the IMSI of the UE, so that the target eNB can conveniently map the load with the UE one by one. The eNB sends a message for updating the IP address to the UE, carrying the new IP address of the UE, optionally carrying the old IP address and/or an address replacement instruction;

h) The method comprises the following steps The target SGW sends a message for updating the information mapping relation to the NAT gateway, and the message carries an old IP address 1 and a new IP address 2 of the UE and a replacement mapping instruction;

i) The method comprises the following steps After the handover is completed, the target eNB instructs the source eNB to release the relevant information of the UE. And simultaneously, the source eNB sends a release message to the local MME, and the local MME and the SGW delete the session of the local UE.

The above describes, by way of example, two cases of switching based on the X2 interface without changing the IP address of the UE and changing the IP address of the UE, and the following describes, by way of specific example, a method of implementing switching based on the X2 interface and the S1 interface without changing the IP address of the UE and changing the IP address of the UE.

Mode two: switching based on the X2 interface and the S1 interface:

further, the receiving the handover request message sent by the second network device includes:

receiving a second handover request message sent by a second MME of a second network device, the second handover request message comprising: a context message of a terminal, the context message comprising: the terminal comprises first bearing information of target bearing of the terminal, first safety information, an International Mobile Subscriber Identity (IMSI) of the terminal and a first IP address of the terminal.

The generating updated path information for handover according to the handover request message includes: generating an uplink endpoint number of the S1 tunnel according to the second switching request message; generating second bearing information and second safety information according to the second switching request message and the uplink endpoint number of the S1 tunnel; and generating a downlink endpoint number of the S1 tunnel and a downlink endpoint number of the X2 tunnel.

In this embodiment, when the UE performs handover, the second base station of the second network device sends a handover request message to the second MME, and the second MME selects the first network device according to the OMC configured switchable network device list. The second MME sends the second handover request message to the first MME, where the second MME carries a context of the UE, and may include first security information of the UE, a first bearer information IMSI, an IP address, and so on. The first bearer information may be the bearer information of the current bearer service, or may be part or all of the bearer information of the terminal.

After the first MME obtains the context of the terminal, a session between the first base station of the first network device and the first SGW of the first network device is created according to the context message and the second bearer information. The first MME initiates a request for creating a session to the first SGW, and simultaneously carries the IMSI of the UE, the first IP address of the UE, the first bearer information, the handover instruction and the like.

After receiving the request for creating the session, the first SGW does not allocate an IP address to the terminal any more, that is, continues to use the first IP address in the message, generates uplink endpoint numbers of the S1 tunnel at the same time, and sends the uplink endpoint numbers of the S1 tunnel to the first MME of the first network device, where the number is the same as the number of bearers.

Or after the first SGW receives the request for creating the session, configuring a second IP address for the terminal. And the first SGW receives the switching instruction in the message, reserves the source IP address (namely the first IP address) of the UE, allocates a new second IP address for the UE, creates an uplink endpoint number of an S1 tunnel at the same time, and sends the uplink endpoint number of the S1 tunnel to a first MME of the first network equipment.

The first MME forwards the second switching request message to the first base station and carries the context information of the terminal and the uplink endpoint number of the S1 tunnel; after receiving the second handover request message, the first base station generates second security information according to first security information carried in the message, and according to the first bearer information, knows an address of a first SGW of an uplink path, and allocates an information radio bearer ID or a plurality of IDs (i.e., the second bearer information) at the same time, and generates a downlink endpoint number of an S1 tunnel and a downlink endpoint number of an X2 tunnel, i.e., S1-TEID and X2-TEID. The number of the endpoints of the X2 tunnel and the S1 tunnel is the same as the bearing number.

Optionally, the method further comprises: sending a second response message to the second MME, the second response message including: the second bearer information, the second security information, the downstream endpoint number of the X2 tunnel and the first indication message; the first indication message is used for indicating: and the second base station of the second network equipment establishes an X2 tunnel with the first base station of the first network equipment, and instructs the second base station to perform X2 tunnel switching.

In this embodiment, the first base station sends the second response message to the first MME, and carries the relevant information corresponding to the bearer and the endpoint number of the X2 tunnel. The first MME forwards the second response message to a second MME of the second network equipment, and the second MME carries the information of creating the X2 tunnel and also carries a first indication message of creating the X2 tunnel, so as to instruct the second base station and the first base station to create the X2 tunnel and perform switching data forwarding. And the second MME sends an indication message to the second base station, carries the endpoint identifier of the X2 tunnel and indicates the second base station to switch the X2 tunnel.

Optionally, the method further comprises: and controlling a first MME of the first network equipment to send a bearing modification message to a first SGW of the first network equipment, wherein the bearing modification message carries a downlink tunnel identifier of the terminal. And the first MME sends a bearing modification message to the first SGW, and carries the downlink tunnel identifier of the terminal. Wherein, in the case that the first SGW allocates a new second IP address to the terminal, the method further includes: and sending an IP address update indication to the terminal, wherein the IP address update indication comprises the second IP address, and optionally, the IP address update indication can also comprise the first IP address.

Under the condition that the IP address of the UE is not changed, sending an Address Resolution Protocol (ARP) update request to the NAT gateway according to the network equipment switching request message, wherein the method comprises the following steps: sending a first mapping relation update request of the IP address and the MAC of the terminal to the NAT gateway; the first mapping relation update request is used for indicating: and updating the MAC address of the second SGW in the second network equipment mapped by the first IP address of the terminal to the MAC address of the first SGW of the first network equipment. And the first SGW sends an IP and MAC mapping relation update request to the NAT gateway, namely the first mapping relation update request, and updates a second SGW MAC mapped by the IP address of the UE to a first SGW MAC.

Under the condition that the IP address of the UE is changed, sending an Address Resolution Protocol (ARP) update request to the NAT gateway according to the network equipment switching request message, wherein the method comprises the following steps: sending a second mapping relation update request of the IP address of the terminal and the public network IP to the NAT gateway; the second mapping relation update request is used for indicating: and updating the mapping relation between the first IP address of the terminal and the public network IP to the mapping relation between the second IP address and the public network IP. And the first SGW sends an IP and MAC mapping relation update request to the NAT gateway, namely the second mapping relation update request, so that the mapping relation between the first IP address of the terminal and the public network IP stored by the NAT gateway is updated into the mapping relation between the second IP address and the public network IP. And the second IP address, the first IP address and the replacement mapping instruction can be carried at the same time.

And after the switching is finished, sending an indication message for releasing the terminal to the second network equipment. The first base station instructs a second base station to release the relevant information of the terminal, meanwhile, the second base station sends a release message to a second MME, and the second MME and a second SGW delete the session of the terminal locally. The second SGW may reserve the IP address of the terminal for a period of time, which may be preset or indicated by the target network, so as not to cause collision with the terminal due to reassignment.

In the following, taking the first network device as the destination HaloB and the second network device as the source HaloB as examples, implementation processes under the two conditions of not changing the IP address of the UE and changing the IP address of the UE when switching based on the X2 tunnel and the S1 tunnel are described. Wherein the destination HaloB comprises a destination eNB, a destination MME and a destination SGW; the source HaloB includes a source eNB, a source MME and a source SGW.

Example 3: based on the switching of the X2 and S1 interfaces, the IP address of the UE is not changed. As shown in fig. 5:

and (c): the OMC configures a neighbor cell HaloB device list capable of switching for all the HaloB devices;

two): when the UE performs handover, the source eNB sends handover required (handover request) message to the source MME of the present device, and the source MME selects a target HaloB, i.e., a target MME, according to the OMC configured switchable HaloB device list, to perform handover. And sending a forwarding reassignment request to a target MME, wherein the forwarding reassignment request carries the context of the UE, including the security information, the bearer information and the like of the UE. Optionally, the bearer information to be switched, which is carried in the bearer information, may only send the bearer information of the current bearer service, or may send part or all of the bearer information;

Three): after acquiring a UE Context, a target MME initiates a request for creating a session to a target SGW, and carries the IMSI of the UE, the IP address of the UE, bearing information, a switching instruction and the like;

fourth): the target SGW receives the switching instruction in the message, does not allocate an IP address to the UE any more, continues to use the IP address in the message, creates S1 uplink tunnel endpoint numbers with the same number as the bearing number, and sends the tunnel endpoint numbers to the target MME;

fifth): the target MME sends a Handover Request message to the target eNB and carries the context of the UE and the endpoint identifier of the uplink S1 tunnel distributed by the target SGW;

sixth): after receiving the Handover Request, the target eNB generates new security information according to the security information carried in the message, and knows the address of the uplink path target SGW according to the received bearer information, and allocates a new radio bearer ID or IDs. Simultaneously generating endpoint numbers of the X2 tunnel and the S1 tunnel, namely X2-TEID and S1-TEID;

seventh): the target eNB sends a response to the target MME and carries the related information of the corresponding bearer and the endpoint number of the tunnel;

eighth): the target MME sends a forwarding reassignment response to the source MME, and the forwarding reassignment response carries information for creating an X2 tunnel and an instruction for creating the X2 tunnel, and instructs the source eNB and the target eNB to create the X2 tunnel so as to forward switching data;

Nine): the source MME sends a command to the source eNB, and instructs the source eNB to perform X2 switching, and the tunnel endpoint identifier of X2 is carried;

ten): the target MME sends a load modification message to the target SGW, and carries a downlink endpoint tunnel identifier of the UE;

eleven): the target SGW sends an update request of the mapping relation between the IP and the MAC to the NAT gateway, namely, the MAC address of the source SGW mapped by the IP address of the UE is updated to the MAC address of the target SGW;

twelve): after the switching is completed, the target eNB instructs the source eNB to release the relevant information of the UE; simultaneously, the source eNB sends a release message to the source ME, and the source MME and the source SGW delete the session of the local UE;

thirteen): the source SGW reserves the IP address of the UE for a period of time so as not to cause collision with the UE due to reassignment.

Example 4: the IP address of the UE is changed based on the switching of the X2 and S1 interfaces. As shown in fig. 6:

the steps a to C are the same as the steps one to three in the above example 3, and are not described here again;

d) The method comprises the following steps The target SGW receives the switching instruction in the message, reserves the source IP address of the UE, reassigns a new IP address for the UE, creates S1 uplink tunnel endpoint numbers, the number of which is the same as the bearing number, and sends the tunnel endpoint numbers to the target MME;

steps E to I are the same as steps five to nine of the above example 3, and are not described here again;

J) The method comprises the following steps The target MME sends a load modification message to the target SGW, and carries a downlink endpoint tunnel identifier of the UE; meanwhile, the target MME sends a message for updating the IP address to the UE, carrying the new IP address of the UE, optionally carrying the old IP address and/or an address replacement instruction;

k) The method comprises the following steps The target SGW sends a message for updating the information mapping relation to the NAT gateway, and the message carries an old IP address 1 and a new IP address 2 of the UE and a replacement mapping instruction;

l): after the handover is completed, the target eNB instructs the source eNB to release the relevant information of the UE. And simultaneously, the source eNB sends a release message to the local MME, and the local MME and the SGW delete the session of the local UE.

The implementation processes under the two conditions of not changing the IP address of the UE and changing the IP address of the UE when the switching is based on the X2 tunnel and the S1 tunnel are described above by taking the first network device as the destination HaloB and the second network device as the source HaloB as examples. By using the message flow of S1 switching, an X2 switching tunnel is established, so that the need of processing a switching list during switching of eNB X2 and carrying MME information during switching can be reduced; the time delay of creating and forwarding transmission path strength of redundancy of the indirect tunnel in the source HaloB based on S1 switching is reduced.

As shown in fig. 7, an embodiment of the present invention further provides a network device switching method, applied to a second network device, including:

step 701, a network device switching request message for a terminal is sent to a first network device, so that the first network device sends an address resolution protocol ARP update request to a NAT gateway according to the network device switching request message; the update request includes: the updated media access control MAC address corresponding to the original IP address of the terminal, or the mapping relation between the updated IP address of the terminal and the public network IP.

The first network device is a target network device to be switched by a terminal, and may be a target HaloB, including a target eNB, a target MME, and a target SGW. The second network device is a source network device (such as a source HaloB, including a source eNB, a source MME, and a source SGW) to which the terminal is currently connected, and the network device handover request message may carry multiple messages of a base station, an MME, a bearer, and the like of the second network device. The first network device acquires the network device switching request message, and considers that the terminal has the intention of switching the network device.

Optionally, before sending the network device handover request message for the terminal to the first network device, the method further comprises: and selecting a target communication device to be switched according to a switchable communication device list configured by the OMC, wherein the target communication device is the first communication device.

The OMC is a unified management system, a neighbor network device list capable of being switched is configured for all network devices, and when the terminal is switched, the eNB or the MME of the second network device selects a target network device to be switched according to the switchable network device list configured by the OMC.

And when the second network equipment connected with the terminal is to be switched to the first network equipment, sending a switching request message to the first network equipment, wherein the switching request message comprises the original transmission path information of the terminal. Specifically, the original transmission path information may include, but is not limited to, the following information: information of a second MME of a second network device: the address information of the MME may be address information of the MME, ID information or domain name information of the MME, or the like; the bearing information to be switched can be the bearing information of the current bearing service or part or all of the bearing information of the terminal; security information such as key information; SGW information in the second network device, etc.; the original transmission path information may further include: context messages of the terminal, such as: IMSI, IP address, etc. of the terminal.

The address information of the second MME may be: the address information of the MME of the second network device may be ID information or domain name information of the MME. The target bearer of the terminal refers to a bearer needing to be switched, and the first bearer information refers to bearer information of a current bearer service, and may further include part or all of bearer information of the terminal. The first security information is security information carried in a first handover request message sent by the second base station, and may be encryption information, such as a key, on an air interface side.

After receiving the first switching request message, the first base station of the first network device generates new second security information according to the first security information carried in the message, and knows the address of the uplink path source SGW according to the first bearer information carried in the first switching request message, and allocates a new radio bearer ID or IDs. And the first base station simultaneously generates end point numbers of the X2 tunnel and the S1 tunnel, namely the X2-TEID and the S1-TEID, and the end point numbers of the X2 tunnel and the S1 tunnel are the same as the bearing number.

Optionally, the method further comprises: receiving a context acquisition request of a terminal sent by the first network equipment through a second MME; transmitting a context message of the terminal to the first network device, the context message comprising: the international mobile subscriber identity IMSI of the terminal and the first IP address of the terminal.

Optionally, the method further comprises: receiving, by the second base station, a first response message sent by the first network device, where the first response message includes: and the downstream endpoint number of the X2 tunnel and the second bearing information.

In this embodiment, when the UE performs handover, the second base station of the second network device sends a second handover request message to the second MME, and the second MME selects the first network device according to the OMC configured switchable network device list. The second MME sends the second handover request message to a first MME of the first network device, where the second MME carries a context of the UE, and may include first security information, first bearer information IMSI, an IP address, and the like of the UE. The first bearer information may be the bearer information of the current bearer service, or may be part or all of the bearer information of the terminal.

Optionally, the method further comprises:

receiving, by the second MME, a second response message sent by the first network device, where the second response message includes: the second bearer information, the second security information, the downstream endpoint number of the X2 tunnel and the first indication message; the first indication message is used for indicating: and the second base station of the second network equipment establishes an X2 tunnel with the first base station of the first network equipment, and instructs the second base station to perform X2 tunnel switching. Transmitting the first indication message to the second base station;

The first MME of the first network device sends a bearer modification message to a first SGW of the first network device. Wherein, in the case that the first SGW allocates a new second IP address to the terminal, the method further includes: and sending an IP address update indication to the terminal, wherein the IP address update indication comprises the second IP address.

The first SGW sends an Address Resolution Protocol (ARP) update request to the NAT gateway, and under the condition that the IP address of the UE is not changed, the ARP update request is a first mapping relation update request of the IP address and the MAC of the terminal, and the first mapping relation update request is used for indicating: updating the MAC address of a second SGW in second network equipment mapped by the first IP address of the terminal to the MAC address of the first SGW; under the condition that the IP address of the UE is changed, the ARP updating request is a second mapping relation updating request of the IP address of the terminal and the public network IP, and the second mapping relation updating request is used for indicating: and updating the mapping relation between the first IP address of the terminal and the public network IP to the mapping relation between the second IP address and the public network IP.

And after the switching is finished, the first base station sends an indication message for releasing the terminal to the second network equipment. Optionally, the method further comprises: receiving an indication message for releasing the terminal; and deleting the session with the terminal according to the indication message. And after receiving the indication message for releasing the terminal, the second base station sends a release message to a second MME, and the second MME and the second SGW delete the session of the terminal locally.

Optionally, after deleting the session with the terminal according to the indication message, the method further comprises: and reserving the preset duration of the first IP address which is not allocated to the terminal. The second SGW may reserve the IP address of the terminal for a period of time, which may be preset or indicated by the target network, so as not to cause collision with the terminal due to reassignment.

It should be noted that, this embodiment is a method applied to a second network device corresponding to the method applied to the first network device, and all the implementation manners of the second network device in the foregoing embodiment are applicable to this embodiment, and the same effect can be achieved.

According to the embodiment of the application, based on the mapping rule of the NAT gateway, when in switching, the switching between core networks, namely the switching of a session anchor point SGW, is realized by updating the mapping table of the IP and the MAC in the NAT gateway or the mapping table of the private network IP and the public network IP, so that the problem that the network switching can be completed only by interrupting the service due to the change of the core network is solved.

The embodiment of the present application further provides a network device as shown in fig. 8, where the network device is a first network device 800, and includes:

a first obtaining module 810, configured to obtain a network device handover request message for a terminal;

a first sending module 820, configured to send an address resolution protocol ARP update request to a NAT gateway according to the network device handover request message;

Optionally, the first acquisition module includes:

a first receiving unit, configured to receive a handover request message sent by a second network device, where the handover request message includes: original transmission path information of the terminal;

and the first generation unit is used for generating updated path information for switching according to the switching request message.

Optionally, the first receiving unit specifically uses: receiving a first handover request message sent by a second base station of a second network device, the first handover request message comprising: address information of a second MME of a second network device, first bearer information of a target bearer of the terminal, and first security information;

The first generation unit is specifically configured to: generating second bearing information and second safety information according to the first switching request message;

Optionally, the network device further includes:

a third sending module, configured to send a context acquisition request of a terminal to a second MME of the second network device;

a first receiving module, configured to receive a context message of a terminal sent by the second MME, where the context message includes: the international mobile subscriber identity IMSI of the terminal and the first IP address of the terminal.

Optionally, the network device further includes:

a fourth sending module, configured to send a first response message to the second base station, where the first response message includes: and the downlink endpoint number of the X2 tunnel and the second bearer information.

Optionally, the network device further includes:

and the first session module is used for creating a session between the first base station of the first network device and the first SGW of the first network device according to the context message, the downlink endpoint number of the S1 tunnel and the second bearer information.

Optionally, the network device further includes:

the first generation module is used for generating an uplink endpoint number of the S1 tunnel and an S1 bearer;

and the first establishing module is used for establishing a mapping relation between the second bearing and the S1 bearing according to the context message and the uplink endpoint number of the S1 tunnel.

Optionally, the network device further includes:

the first configuration module is used for configuring a second IP address for the terminal;

the second generation module is used for generating an uplink endpoint number of the S1 tunnel and an S1 bearer;

and the second establishing module is used for establishing a mapping relation between a second bearer and an S1 bearer according to the context message, the uplink endpoint number of the S1 tunnel and the second IP address.

Optionally, the network device further includes:

and the fifth sending module is used for sending an IP address updating indication to the terminal, wherein the IP address updating indication comprises the second IP address.

Optionally, the first receiving unit specifically uses: receiving a second handover request message sent by a second MME of a second network device, the second handover request message comprising: a context message of a terminal, the context message comprising: the method comprises the steps of carrying first bearing information, first safety information and a first IP address of a terminal of a target bearing of the terminal, wherein the first bearing information, the first safety information and an International Mobile Subscriber Identity (IMSI) of the terminal are carried out;

The first generation unit is specifically configured to:

Optionally, the network device further includes:

and the second session module is used for creating a session between the first base station of the first network device and the first SGW of the first network device according to the context message and the second bearer information.

Optionally, the network device further includes:

a sixth sending module, configured to send a second response message to the second MME, where the second response message includes: the second bearer information, the second security information, the downstream endpoint number of the X2 tunnel and the first indication message;

Optionally, the network device further includes:

a seventh sending module, configured to control a first MME of the first network device to send a bearer modification message to a first SGW of the first network device, where the bearer modification message carries a downlink tunnel identifier of the terminal.

Optionally, the first sending module is specifically configured to:

Optionally, the network device further includes:

the second configuration module is used for configuring a second IP address for the terminal;

and the eighth sending module is used for sending an IP address update indication to the terminal, wherein the IP address update indication comprises the second IP address.

Optionally, the first sending module is specifically configured to:

Optionally, the network device further includes:

and the ninth sending module is used for sending an indication message for releasing the terminal to the second network equipment.

It should be noted that, the network device provided in the embodiment of the present invention can implement all the method steps implemented in the method embodiment applied to the first network device, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in the embodiment are omitted herein.

The embodiment of the present application further provides a network device as shown in fig. 9, where the network device is a second network device 900, and includes:

a second sending module 910, configured to send a network device handover request message for a terminal to a first network device, so that the first network device sends an address resolution protocol ARP update request to a NAT gateway according to the network device handover request message;

Optionally, the network device further includes:

and the selection module is used for selecting the target communication equipment to be switched according to the switchable communication equipment list configured by the OMC, wherein the target communication equipment is the first communication equipment.

Optionally, the second sending module includes:

a first sending unit, configured to send a handover request message to a first network device, where the handover request message includes: and the original transmission path information of the terminal is used for enabling the first network equipment to generate updated path information for switching according to the switching request message.

Optionally, the first sending unit is specifically configured to:

Optionally, the network device further includes:

a second receiving module, configured to receive, by using a second MME, a context acquisition request of a terminal sent by the first network device;

a tenth sending module, configured to send a context message of the terminal to the first network device, where the context message includes: the international mobile subscriber identity IMSI of the terminal and the first IP address of the terminal.

Optionally, the network device further includes:

a third receiving module, configured to receive, by using the second base station, a first response message sent by the first network device, where the first response message includes: and the downstream endpoint number of the X2 tunnel and the second bearing information.

Optionally, the first sending unit is specifically configured to:

Optionally, the network device further includes:

a fourth receiving module, configured to receive, by using the second MME, a second response message sent by the first network device, where the second response message includes: the second bearer information, the second security information, the downstream endpoint number of the X2 tunnel and the first indication message;

an eleventh sending module, configured to send the first indication message to the second base station;

Optionally, the network device further includes:

a fifth receiving module, configured to receive an indication message for releasing the terminal;

and the first processing module is used for deleting the session with the terminal according to the indication message.

Optionally, the network device further includes:

and the second processing module is used for reserving the preset duration of the first IP address which is not allocated to the terminal.

It should be noted that, the network device provided in the embodiment of the present invention can implement all the method steps implemented in the method embodiment applied to the second network device, and can achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in the embodiment are omitted herein.

In order to better achieve the above object, as shown in fig. 10, an embodiment of the present invention further provides a network device, which is a first network device, including a transceiver 104, a memory 103, a processor 101, and a computer program stored on the memory and executable on the processor.

The memory 103 is connected to the processor 101 through a bus interface 102, the memory 103 is used for storing programs and data used by the processor 101 when executing operations, and when the processor 101 calls and executes the programs and data stored in the memory 103, the steps of the above-mentioned switching method between network devices are executed.

Wherein a transceiver 104 is coupled to the bus interface 102 for receiving and transmitting data under the control of the processor 101. Specifically, the processor 101, when executing a computer program, performs the steps of:

Transmitting a network device switching request message for a terminal to a first network device through a transceiver 104, so that the first network device transmits an Address Resolution Protocol (ARP) update request to a NAT gateway according to the network device switching request message;

Optionally, the processor 101 implements the following steps when executing the computer program:

receiving, by the transceiver 104, a handover request message sent by the second network device, where the handover request message includes: original transmission path information of the terminal;

receiving, by the transceiver 104, a first handover request message sent by a second base station of a second network device, the first handover request message comprising: address information of a second MME of a second network device, first bearer information of a target bearer of the terminal, and first security information;

transmitting, by the transceiver 104, a context acquisition request of the terminal to a second MME of the second network device;

transmitting, by the transceiver 104, a first response message to the second base station, the first response message comprising: and the downlink endpoint number of the X2 tunnel and the second bearer information.

and establishing a session between the first base station of the first network device and the first SGW of the first network device according to the context message, the downlink endpoint number of the S1 tunnel and the second bearer information.

generating an uplink endpoint number of the S1 tunnel and an S1 bearer;

configuring a second IP address for the terminal;

generating an uplink endpoint number of the S1 tunnel and an S1 bearer;

an IP address update indication is sent to the terminal via the transceiver 184, the IP address update indication comprising the second IP address.

receiving, by the transceiver 104, a second handover request message sent by a second MME of a second network device, the second handover request message comprising: a context message of a terminal, the context message comprising: the method comprises the steps of carrying first bearing information, first safety information and a first IP address of a terminal of a target bearing of the terminal, wherein the first bearing information, the first safety information and an International Mobile Subscriber Identity (IMSI) of the terminal are carried out;

transmitting, by transceiver 104, a second response message to the second MME, the second response message comprising: the second bearer information, the second security information, the downstream endpoint number of the X2 tunnel and the first indication message;

transmitting a first mapping relation update request of the IP address and the MAC of the terminal to the NAT gateway through a transceiver 104;

configuring a second IP address for the terminal;

an IP address update indication is sent to the terminal via the transceiver 104, the IP address update indication comprising the second IP address.

transmitting a second mapping relation update request of the IP address of the terminal and the public network IP to the NAT gateway through the transceiver 104;

an indication message releasing the terminal is sent to the second network device via the transceiver 104.

It should be noted that in fig. 10, the bus architecture may include any number of interconnected buses and bridges, and in particular, one or more processors 101, represented by processor 101, and various circuits of the memory, represented by memory 103, are chained together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 104 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 101 is responsible for managing the bus architecture and general processing, and the memory 103 may store data used by the processor 101 in performing operations.

Those skilled in the art will appreciate that all or part of the steps of implementing the above-described embodiments may be implemented by hardware, or may be implemented by instructing the relevant hardware by a computer program comprising instructions for performing some or all of the steps of the above-described methods; and the computer program may be stored in a readable storage medium, which may be any form of storage medium.

The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the steps of a handover method between network devices applied to a first network device.

In order to better achieve the above object, as shown in fig. 11, an embodiment of the present invention further provides a network device, which is a second network device, including a transceiver 114, a memory 113, a processor 111, and a computer program stored on the memory and executable on the processor.

The memory 113 is connected to the processor 111 through a bus interface 112, and the memory 113 is used for storing programs and data used by the processor 111 when executing operations, and when the processor 111 calls and executes the programs and data stored in the memory 113, the steps of the above-mentioned switching method between network devices are executed.

Wherein a transceiver 114 is coupled to the bus interface 112 for receiving and transmitting data under the control of the processor 111. Specifically, the processor 111, when executing the computer program, implements the following steps:

transmitting a network device switching request message for a terminal to a first network device through a transceiver 114, so that the first network device transmits an address resolution protocol ARP update request to a NAT gateway according to the network device switching request message;

Optionally, the processor 111 when executing the computer program implements the following steps:

and selecting a target communication device to be switched according to a switchable communication device list configured by the OMC, wherein the target communication device is the first communication device.

transmitting a handover request message to the first network device via the transceiver 114, the handover request message comprising: and the original transmission path information of the terminal is used for enabling the first network equipment to generate updated path information for switching according to the switching request message.

transmitting a context message of the terminal to the first network device, the context message comprising: the international mobile subscriber identity IMSI of the terminal and the first IP address of the terminal.

transmitting the first indication message to the second base station;

receiving an indication message for releasing the terminal;

and deleting the session with the terminal according to the indication message.

It should be noted that in fig. 11, the bus architecture may include any number of interconnected buses and bridges, and in particular, one or more processors 111, represented by processor 111, and various circuits of the memory, represented by memory 113, are linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 114 may be a number of elements, including a transmitter and a transceiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 111 is responsible for managing the bus architecture and general processing, and the memory 113 may store data used by the processor 111 in performing operations.

The embodiment of the invention also provides a computer readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the steps of a handover method between network devices applied to a second network device. And the same technical effects can be achieved, and in order to avoid repetition, the description is omitted here. Wherein the computer readable storage medium is selected from Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), magnetic disk or optical disk.

Furthermore, it should be noted that in the apparatus and method of the present invention, it is apparent that the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention. Also, the steps of performing the series of processes described above may naturally be performed in chronological order in the order of description, but are not necessarily performed in chronological order, and some steps may be performed in parallel or independently of each other. It will be appreciated by those of ordinary skill in the art that all or any of the steps or components of the methods and apparatus of the present invention may be implemented in hardware, firmware, software, or a combination thereof in any computing device (including processors, storage media, etc.) or network of computing devices, as would be apparent to one of ordinary skill in the art after reading this description of the invention.

The object of the invention can thus also be achieved by running a program or a set of programs on any computing device. The computing device may be a well-known general purpose device. The object of the invention can thus also be achieved by merely providing a program product containing program code for implementing said method or apparatus. That is, such a program product also constitutes the present invention, and a storage medium storing such a program product also constitutes the present invention. It is apparent that the storage medium may be any known storage medium or any storage medium developed in the future. It should also be noted that in the apparatus and method of the present invention, it is apparent that the components or steps may be disassembled and/or assembled. Such decomposition and/or recombination should be considered as equivalent aspects of the present invention. The steps of executing the series of processes may naturally be executed in chronological order in the order described, but are not necessarily executed in chronological order. Some steps may be performed in parallel or independently of each other.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.

Claims

1. A network device switching method applied to a first network device, comprising:

acquiring a network equipment switching request message aiming at a terminal;

the update request includes: an updated Medium Access Control (MAC) address corresponding to an original IP address of the terminal, or a mapping relation between the updated IP address of the terminal and a public network IP;

the first network equipment is target network equipment for terminal to be switched, and the first network equipment is a base station gathering light core network capacity;

the acquiring the network equipment switching request message aiming at the terminal comprises the following steps:

generating updated path information for handover according to the handover request message;

the receiving the handover request message sent by the second network device includes:

generating a downlink endpoint number of an S1 tunnel and a downlink endpoint number of an X2 tunnel for switching;

or,

2. The method according to claim 1, wherein the method further comprises:

3. The method according to claim 1, wherein the method further comprises:

4. The method according to claim 2, wherein after the acquiring the network device handover request message for the terminal, the method further comprises:

5. The method according to claim 2, wherein after the acquiring the network device handover request message for the terminal, the method further comprises:

generating an uplink endpoint number of the S1 tunnel and an S1 bearer;

6. The method according to claim 2, wherein after acquiring the network device handover request message for the terminal, the method further comprises:

configuring a second IP address for the terminal;

generating an uplink endpoint number of the S1 tunnel and an S1 bearer;

7. The method of claim 6, wherein the method further comprises:

8. The method according to claim 1, wherein the method further comprises:

9. The method according to claim 1, wherein the method further comprises:

10. The method according to claim 1, wherein the method further comprises:

11. The method according to claim 1 or 2, wherein said sending an address resolution protocol ARP update request to a NAT gateway according to the network device handover request message comprises:

12. The method according to claim 1, wherein the method further comprises:

configuring a second IP address for the terminal;

13. The method according to claim 6 or 12, wherein said sending an address resolution protocol, ARP, update request to a NAT gateway according to the network device handover request message comprises:

14. The method according to claim 1, wherein the method further comprises:

15. A network device switching method applied to a second network device, comprising:

the update request includes: an updated Media Access Control (MAC) address corresponding to an original IP address of the terminal, or a mapping relation between the updated IP address of the terminal and a public network IP;

The first network device is a destination network device to be switched by the terminal, and the second network device is a source network device currently connected with the terminal; the first network device and the second network device are base stations aggregating lightweight core network capabilities;

the sending a network device handover request message for a terminal to a first network device includes:

transmitting a handover request message to a first network device, the handover request message comprising: the original transmission path information of the terminal so that the first network equipment generates updated path information for switching according to the switching request message;

the sending a handover request message to a first network device includes:

transmitting, by a second base station of the second network device, a first handover request message to the first network device, the first handover request message including: address information of a second MME of a second network device, first bearer information of a target bearer of the terminal, and first security information; the first switching request message is used for generating second bearing information, second safety information, a downlink endpoint number of an S1 tunnel used for switching and a downlink endpoint number of an X2 tunnel;

Or,

the sending a handover request message to a first network device includes:

transmitting the second handover request message to the first network device, the second handover request message including: a context message of a terminal, the context message comprising: the method comprises the steps of carrying first bearing information, first safety information and a first IP address of a terminal of a target bearing of the terminal, wherein the first bearing information, the first safety information and an International Mobile Subscriber Identity (IMSI) of the terminal are carried out; the second handover request message is used for generating an uplink endpoint number of the S1 tunnel, second bearer information, second security information, a downlink endpoint number of the S1 tunnel and a downlink endpoint number of the X2 tunnel.

16. The method of claim 15, wherein prior to sending the network device handover request message for the terminal to the first network device, the method further comprises:

17. The method of claim 15, wherein the method further comprises:

18. The method of claim 17, wherein the method further comprises:

19. The method of claim 15, wherein the method further comprises:

transmitting the first indication message to the second base station;

20. The method of claim 15, wherein the method further comprises:

receiving an indication message for releasing the terminal;

and deleting the session with the terminal according to the indication message.

21. The method of claim 20, wherein after deleting the session with the terminal according to the indication message, the method further comprises:

22. A network device, the network device being a first network device, comprising:

the first acquisition module includes:

a first generation unit configured to generate updated path information for handover according to the handover request message;

the first receiving unit is specifically configured to: receiving a first handover request message sent by a second base station of a second network device, the first handover request message comprising: address information of a second MME of a second network device, first bearer information of a target bearer of the terminal, and first security information;

or,

the first receiving unit is specifically configured to: receiving a second handover request message sent by a second MME of a second network device, the second handover request message comprising: a context message of a terminal, the context message comprising: the method comprises the steps of carrying first bearing information, first safety information and a first IP address of a terminal of a target bearing of the terminal, wherein the first bearing information, the first safety information and an International Mobile Subscriber Identity (IMSI) of the terminal are carried out;

The first generation unit is specifically configured to:

23. A network device, the network device being a second network device, comprising:

The second transmitting module includes:

a first sending unit, configured to send a handover request message to a first network device, where the handover request message includes: the original transmission path information of the terminal so that the first network equipment generates updated path information for switching according to the switching request message;

the first sending unit is specifically configured to:

or,

the first sending unit is specifically configured to:

24. A network device, the network device being a first network device, comprising: a transceiver, a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor when executing the computer program performs the steps of:

acquiring a network equipment switching request message aiming at a terminal;

the processor, when executing the computer program, performs the steps of:

receiving, by the transceiver, a handover request message sent by the second network device, where the handover request message includes: original transmission path information of the terminal; generating updated path information for handover according to the handover request message;

the processor, when executing the computer program, performs the steps of:

Receiving, by a transceiver, a first handover request message transmitted by a second base station of a second network device, the first handover request message comprising: address information of a second MME of a second network device, first bearer information of a target bearer of the terminal, and first security information;

or,

receiving, by the transceiver, a second handover request message sent by a second MME of a second network device, the second handover request message comprising: a context message of a terminal, the context message comprising: the method comprises the steps of carrying first bearing information, first safety information and a first IP address of a terminal of a target bearing of the terminal, wherein the first bearing information, the first safety information and an International Mobile Subscriber Identity (IMSI) of the terminal are carried out;

25. A network device, the network device being a second network device, comprising: a transceiver, a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor when executing the computer program performs the steps of:

the processor, when executing the computer program, performs the steps of: transmitting, by a transceiver, a handover request message to a first network device, the handover request message comprising: the original transmission path information of the terminal so that the first network equipment generates updated path information for switching according to the switching request message;

The processor, when executing the computer program, performs the steps of:

or,

26. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the network device switching method according to any one of claims 1 to 14 or the steps of the network device switching method according to any one of claims 15 to 21.