CN110831110B - Access method, switching method, device and system - Google Patents

Access method, switching method, device and system Download PDF

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Publication number
CN110831110B
CN110831110B CN201810893346.7A CN201810893346A CN110831110B CN 110831110 B CN110831110 B CN 110831110B CN 201810893346 A CN201810893346 A CN 201810893346A CN 110831110 B CN110831110 B CN 110831110B
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network
mobility management
identifier
network device
access
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CN110831110A (en
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陈靖
杜如川
陆长奇
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The embodiment of the application provides an access method, a switching method, equipment and a system, so that the re-access or switching process of a dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The access method comprises the following steps: an access device in a first network receives an access request from a terminal, wherein the access request carries a first mobile management identifier and a third mobile management identifier, the first mobile management identifier is an identifier of a first mobile management network element in the first network, and the third mobile management identifier is a mapping mobile management identifier in the first network obtained by mapping a mobile management identifier in a GUTI (globally unique identifier) of the terminal in a second network; and under the condition that the access equipment determines that the first mobility management network element is not connected with the access equipment according to the first mobility management identifier, the access equipment determines the target converged network equipment according to the third mobility management identifier.

Description

Access method, switching method, device and system
Technical Field
The present application relates to the field of communications technologies, and in particular, to an access method, a handover method, a device, and a system.
Background
With the development of communication technology, the existing terminals are classified into two categories, namely a single registration terminal and a double registration terminal, according to the working state. The single registration terminal can only register in a fourth generation (4th generation, 4G) network or a fifth generation (5th generation, 5G) network at the same time, and can migrate between the 4G network and the 5G network through a network reselection or switching process; the dual-registration terminal can simultaneously register in the 4G network and the 5G network at the same time, but does not perform network reselection or handover procedures between the 4G network and the 5G network.
That is, currently, for a dual registration terminal, simultaneous registration in a 4G network and a 5G network is supported at the same time, and one or more of a network reselection within the 4G network, a handover within the 4G network, a network reselection within the 5G network, or a handover procedure within the 5G network may occur, but a network reselection or a handover procedure between the 4G network and the 5G network is not supported. In order to implement the above process, a plurality of Mobility Management Entities (MMEs) need to be deployed in the 4G network, and a plurality of access and mobility management function (AMF) network elements need to be deployed in the 5G network, which obviously increases the complexity of network deployment and the workload of network operation and maintenance.
Therefore, how to implement the re-access or handover process of the dual-registration terminal on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance is a problem to be solved urgently at present.
Disclosure of Invention
The embodiment of the application provides an access method, a switching method, equipment and a system, so that the re-access or switching process of a dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
in a first aspect, an access method is provided, where the access method includes: an access device in a first network receives an access request from a terminal, wherein the access request carries a first mobility management identifier and a third mobility management identifier, the first mobility management identifier is an identifier of a first mobility management network element in the first network, the third mobility management identifier is a mapping mobility management identifier in the first network obtained by mapping a mobility management identifier in a Globally Unique Temporary Identifier (GUTI) of the terminal in a second network, and the first network and the second network are different types of networks; and when the access device determines that the first mobility management element is not connected with the access device according to the first mobility management identifier, the access device determines a target converged network device according to the third mobility management identifier, wherein a mapped mobility management identifier in the first network corresponding to the target converged network device as the mobility management element in the second network is the third mobility management identifier, and the target converged network device is used for accessing the terminal to the first network. Based on the scheme, on one hand, the target convergence network device in the access system integrates the functions of the mobile management network element in the first network and the second network, so that the number of devices in the network is reduced, and the workload of network operation and maintenance is simplified; network address resources are reduced, and complexity of network planning and deployment is simplified; moreover, the occupation proportion of the hardware resources can be flexibly adjusted according to the traffic of the first network and the second network, and the hardware resources are shared, so that the resource utilization efficiency and the return on investment are improved. On the other hand, the access request received by the access device in the first network not only carries the identifier of the first mobility management network element in the first network, but also carries the mapping mobility management identifier in the first network obtained by mapping the mobility management identifier in the GUTI of the terminal in the second network, so that the access device can determine the target converged network device according to the third mobility management identifier when determining that the access device is not connected with the first mobility management network element according to the first mobility management identifier, and the mapping mobility management identifier in the first network corresponding to the target converged network device as the mobility management network element in the second network is the third mobility management identifier. That is to say, when the dual registration terminal has selected a converged network device in the second network and performs re-access in the first network, it can be ensured that the same converged network device is selected, and re-access of the dual registration terminal is realized. In conclusion, based on the access method, the dual-registration terminal can be re-accessed on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance.
In one possible design, before the access device in the first network receives the access request from the terminal, the access method further includes: the access device sends an establishment request to the target converged network device, wherein the establishment request is used for requesting to register to the target converged network device; the access device receives an establishment response from the target converged network device, where the establishment response carries a second mobility management identifier and the third mobility management identifier, where the second mobility management identifier is an original mobility management identifier corresponding to the target converged network device serving as a second mobility management network element in the first network. Based on the scheme, the access device can acquire the second mobility management identifier and the third mobility management identifier.
In one possible design, the first network is a fourth generation 4G network and the second network is a fifth generation 5G network; correspondingly, the first mobility management identity is a first globally unique mobility management entity identity GUMMEI, and the third mobility management identity is a third GUMMEI. That is, based on the scheme, the re-access of the dual-registration terminal in the 4G network can be realized.
Or, optionally, the first network is a 5G network, and the second network is a 4G network; correspondingly, the first mobility management identity is a first globally unique access and mobility management function identity, GUAMI, and the third mobility management identity is a third GUAMI. That is, based on the scheme, re-access of the dual registration terminal in the 5G network can be achieved.
In a second aspect, an access method is provided, where the access method includes: the method comprises the steps that a first converged network device receives an access request from an access device in a first network, wherein the access request carries a globally unique temporary identifier GUTI of a terminal in a second network, and the first network and the second network are different types of networks; the first converged network device determines that the terminal accesses the second network through a second converged network device connected with the access device according to the GUTI; the first converged network device sends the access request to the second converged network device, and the access request is used for the terminal to access the first network through the second converged network device. Based on the scheme, on one hand, since the converged network devices (including the first converged network device and the second converged network device) in the access method integrate the functions of the mobile management network element in the first network and the functions of the mobile management network element in the second network, the number of devices in the network is reduced, and the workload of network operation and maintenance is simplified; network address resources are reduced, and complexity of network planning and deployment is simplified; moreover, the occupation proportion of the hardware resources can be flexibly adjusted according to the traffic of the first network and the second network, and the hardware resources are shared, so that the resource utilization efficiency and the return on investment are improved. On the other hand, the access request sent by the access device in the first network to the first converged network device carries the GUTI of the terminal in the second network, so that the first converged network device can determine that the terminal accesses the second network through the second converged network device connected by the access device according to the GUTI, and then the first converged network device can send the access request to the second converged network device, wherein the access request is used for the terminal to access the first network through the second converged network device. That is to say, when the dual registration terminal has selected a converged network device in the second network and performs re-access in the first network, it can be ensured that the same converged network device is selected, and re-access of the dual registration terminal is realized. In conclusion, based on the access method, the dual-registration terminal can be re-accessed on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance.
In a possible design, the first converged network device determines, according to the GUTI, that the terminal accesses the second network through the second converged network device to which the access device is connected, specifically: the first converged network device determining that the GUTI is not a GUTI assigned by the first converged network device; and the first converged network device determines that the mobility management resource pool to which the mobility management element of the GUTI is allocated is the same as the mobility management resource pool to which the first converged network device belongs when the first converged network device serves as the mobility management element in the second network, and then the first converged network device determines that the terminal accesses the second network through the second converged network device connected with the access device. Based on the scheme, the first converged network device can determine that the terminal accesses the second network through the second converged network device to which the access device is connected.
In a possible design, the first converged network device determines, according to the GUTI, that the terminal accesses the second network through the second converged network device to which the access device is connected, specifically: the first converged network device determining that the GUTI is not a GUTI assigned by the first converged network device; the first converged network device acquires address information of a target mobility management network element which allocates the GUTI to the terminal, and address information of candidate mobility management network elements which can provide service for access equipment in the first network; and under the condition that the information of the target mobility management network element is in the address information of the candidate mobility management network element, the first converged network device determines that the terminal accesses the second network through a second converged network device connected with the access device once. Based on the scheme, the first converged network device can determine that the terminal accesses the second network through the second converged network device to which the access device is connected.
In a possible design, the first converged network device sends the access request to the second converged network device, specifically: the first converged network device sends a rerouting request message to the access device, where the rerouting request message carries the access request and a mapping mobility management identifier in the first network obtained by mapping a first mobility management identifier in the GUTI, and the mapping mobility management identifier is used for the access device to send the access request to the second converged network device. That is, the first converged network device may send the access request to the second converged network device by means of the access device rerouting.
In one possible design, the access method further includes: the first converged network device acquires address information of the second converged network device according to the GUTI; correspondingly, the first converged network device sends the access request to the second converged network device, specifically: and the first converged network device sends the access request to the second converged network device according to the address information of the second converged network device. That is, the first converged network device can be directed directly to the second converged network device.
In a possible design, the first converged network device obtains address information of the second converged network device according to the GUTI, specifically: the first converged network device sends a first request message, wherein the first request message carries a mapping mobile management identifier in the first network, which is obtained by mapping a first mobile management identifier in the GUTI, and is used for inquiring address information of the second converged network device; the first converged network device receives a first response message, wherein the first response message carries address information of the second converged network device. Based on the scheme, the first converged network device can acquire address information of the second converged network device.
In one possible design, the first network is a fourth generation 4G network and the second network is a fifth generation 5G network; correspondingly, the first converged network device sends the first request message, specifically: the first converged network device sends the first request message to a Domain Name System (DNS) server; correspondingly, the first converged network device receives the first response message, specifically: the first converged network device receives the first response message from the DNS server. That is, the first converged network device can query the DNS server for address information to the second converged network device.
In one possible design, the first network is a 5G network and the second network is a 4G network; correspondingly, the first converged network device sends the first request message, specifically: the first converged network device sends the first request message to a network storage function network element; correspondingly, the first converged network device receives the first response message, specifically: the first converged network device receives the first response message from the network storage function network element. That is, the first converged network device may query address information of the second converged network device from the network storage function network element.
In a possible design, the first converged network device obtains address information of the second converged network device according to the GUTI, specifically: the first converged network device sends a second request message, wherein the second request message carries the first mobile management identifier in the GUTI and is used for inquiring the address information of the second converged network device; and the first converged network device receives a second response message, wherein the second response message carries the address information of the second converged network device. Based on the scheme, the first converged network device can acquire address information of the second converged network device.
In one possible design, the first network is a 4G network and the second network is a 5G network; correspondingly, the first converged network device sends the second request message, specifically: the first converged network device sends the second request message to a network storage function network element; correspondingly, the first converged network device receives the second response message, specifically: the first converged network device receives the second response message from the network storage function network element. That is, the first converged network device may query address information of the second converged network device from the network storage function network element.
In one possible design, the first network is a 5G network and the second network is a 4G network; correspondingly, the first converged network device sends the second request message, specifically: the first converged network device sends the second request message to a DNS server; correspondingly, the first converged network device receives the second response message, specifically: the first converged network device receives the second response message from the DNS server. That is, the first converged network device can query the DNS server for address information to the second converged network device.
In one possible design, the access method further includes: the first converged network device determines the address information of the target mobility management network element as the address information of the second converged network device; correspondingly, the first converged network device sends the access request to the second converged network device, specifically: and the first converged network device sends the access request to the second converged network device according to the address information of the second converged network device. That is, the first converged network device can be directed directly to the second converged network device.
In a possible design, the first converged network device obtains address information of a target mobility management element that allocates the GUTI to the terminal, specifically: the first converged network device sends a first request message, wherein the first request message carries a mapping mobile management identifier in the first network, which is obtained by mapping a first mobile management identifier in the GUTI, and is used for inquiring address information of the target mobile management network element; the first converged network device receives a first response message, wherein the first response message carries the address information of the target mobility management network element. Based on the scheme, the first converged network device can acquire the address information of the target mobility management network element that allocates the GUTI to the terminal.
In one possible design, the first network is a 4G network and the second network is a 5G network; correspondingly, the first converged network device sends the first request message, specifically: the first converged network device sends the first request message to a DNS server; correspondingly, the first converged network device receives the first response message, specifically: the first converged network device receives the first response message from the DNS server. That is, the first converged network device may query the address information to the target mobility management network element from the DNS server.
In one possible design, the first network is a 5G network and the second network is a 4G network; correspondingly, the first converged network device sends the first request message, specifically: the first converged network device sends the first request message to a network storage function network element; correspondingly, the first converged network device receives the first response message, specifically: the first converged network device receives the first response message from the network storage function network element. That is, the first converged network device may query the address information of the target mobility management network element from the network storage function network element.
In a possible design, the first converged network device obtains address information of a target mobility management element that allocates the GUTI to the terminal, specifically: the first converged network device sends a second request message, wherein the second request message carries the first mobility management identity in the GUTI and is used for inquiring address information of a target mobility management network element for allocating the GUTI to the terminal; and the first converged network device receives a second response message, wherein the second response message carries the address information of the target mobile management network element. Based on the scheme, the first converged network device can acquire the address information of the target mobility management network element that allocates the GUTI to the terminal.
In one possible design, the first network is a 4G network and the second network is a 5G network; correspondingly, the first converged network device sends the second request message, specifically: the first converged network device sends the second request message to a network storage function network element; correspondingly, the first converged network device receives the second response message, specifically: the first converged network device receives the second response message from the network storage function network element. That is, the first converged network device may query the address information of the target mobility management network element from the network storage function network element.
In one possible design, the first network is a 5G network and the second network is a 4G network; correspondingly, the first converged network device sends the second request message, specifically: the first converged network device sends the second request message to a DNS server; correspondingly, the first converged network device receives the second response message, specifically: the first converged network device receives the second response message from the DNS server. That is, the first converged network device may query the address information to the target mobility management network element from the DNS server.
In a possible design, the acquiring, by the first converged network device, address information of a candidate mobility management network element capable of providing a service for the access device in the first network specifically includes: the first converged network device receives address information of the candidate mobility management network elements capable of providing services for the access device in the first network from the source mobility management network element. Based on the scheme, the first converged network device can obtain address information of candidate mobility management network elements capable of providing services for the access device in the first network.
In a possible design, the acquiring, by the first converged network device, address information of a candidate mobility management network element capable of providing a service for the access device in the first network specifically includes: the first converged network device receives the identifier of the access device from the source mobility management network element or the identifier of the tracking area served by the access device; the first converged network device obtains address information of candidate mobility management network elements capable of providing services for the access device in the first network according to the identifier of the access device or the identifier of the tracking area served by the access device. Based on the scheme, the first converged network device can obtain address information of candidate mobility management network elements capable of providing services for the access device in the first network.
In a third aspect, a handover method is provided, where the handover method includes: a source mobile management network element in a first network receives a handover requirement from a first access device in the first network, wherein the handover requirement carries an identifier of a second access device of the first network or an identifier of a tracking area served by the second access device, and a globally unique temporary identifier GUTI of the terminal in the second network, and the first network and the second network are different types of networks; the source mobility management network element acquires an identification list and address information of candidate mobility management network elements according to the identification of the second access device or the identification of the tracking area; the source mobility management network element determines a target converged network device according to the GUTI and the identifier list of the candidate mobility management network elements, wherein the target converged network device is a converged network device corresponding to one identifier in the identifier list of the candidate mobility management network elements; and the source mobility management network element sends a request message to the target converged network device according to the address information of the target converged network device included in the address information of the candidate mobility management network element, wherein the request message is used for switching the terminal to the target converged network device. Based on the scheme, on one hand, the target convergence network device in the access system integrates the functions of the mobile management network element in the first network and the second network, so that the number of devices in the network is reduced, and the workload of network operation and maintenance is simplified; network address resources are reduced, and complexity of network planning and deployment is simplified; moreover, the occupation proportion of the hardware resources can be flexibly adjusted according to the traffic of the first network and the second network, and the hardware resources are shared, so that the resource utilization efficiency and the return on investment are improved. On the other hand, in the handover method provided in this embodiment of the present application, a source mobility management network element in a first network receives a handover request from a first access device, where the handover request carries not only an identifier of a second access device of the first network or an identifier of a tracking area served by the second access device, but also a GUTI of a terminal in the second network, so that the source mobility management network element may obtain an identifier list and address information of a candidate mobility management network element according to the identifier of the second access device or the identifier of the tracking area, may determine a target convergence network device according to the GUTI and the identifier list of the candidate mobility management network element, and further may send a request message to the target convergence network device, where the request message is used to handover the terminal to the target convergence network device. That is to say, even when the dual registration terminal has switched to a converged network device in the second network and performs a handover procedure in the first network, the dual registration terminal can be guaranteed to be successfully switched to the same converged network device. In conclusion, based on the switching method, the successful switching of the dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance.
In a possible design, the source mobility management element determines the target converged network device according to the GUTI and the identifier list of the candidate mobility management element, and specifically includes: the source mobility management network element determines a mapping mobility management identifier of a first mobility management identifier in the GUTI in the first network; and the source mobility management network element determines the converged network device corresponding to the identifier which is the same as the mapping mobility management identifier in the identifier list of the candidate mobility management network element as the target converged network device. Based on the scheme, the source mobility management network element can determine the target converged network device.
In one possible design, the first network is a fourth generation 4G network and the second network is a fifth generation 5G network; correspondingly, the first mobility management identity is a globally unique access and mobility management function identity GUAMI, and the mapping mobility management identity is a globally unique mobility management entity identity GUMMEI. That is, based on this scheme, handover of the dual registration terminal in the 4G network can be achieved.
In one possible design, the first network is a 5G network and the second network is a 4G network; accordingly, the first mobility management identifier is GUMMEI, and the mapping mobility management identifier is GUAMI. That is, based on this scheme, handover of the dual registration terminal in the 5G network can be achieved.
In a fourth aspect, a handover method is provided, which includes: the method comprises the steps that a first converged network device receives address information of a source mobile management network element from the source mobile management network element in a first network and a globally unique temporary identifier GUTI of a terminal in a second network, wherein the first network and the second network are different types of networks; the first converged network device determines that the terminal accesses the second network through a second converged network device which can provide service for the target access device in the first network according to the GUTI; and the first converged network device sends the GUTI and the address information of the source mobile management network element to the second converged network device according to the address information of the second converged network device, wherein the GUTI and the address information of the source mobile management network element are used for switching the terminal to the second converged network device. Based on the scheme, on one hand, since the converged network devices (including the first converged network device and the second converged network device) in the handover method integrate the functions of the mobile management network element in the first network and the functions of the mobile management network element in the second network, the number of devices in the network is reduced, and the workload of network operation and maintenance is simplified; network address resources are reduced, and complexity of network planning and deployment is simplified; moreover, the occupation proportion of the hardware resources can be flexibly adjusted according to the traffic of the first network and the second network, and the hardware resources are shared, so that the resource utilization efficiency and the return on investment are improved. On the other hand, in the handover method provided in this embodiment of the present application, the first converged network device may receive address information of a source mobility management network element from the source mobility management network element in the first network and a GUTI of the terminal in the second network, and may determine, according to the GUTI of the terminal in the second network, that the terminal has accessed the second network through the second converged network device 402 capable of providing a service for the target access device in the first network, and further, the first converged network device may send, to the second converged network device, the GUTI of the terminal in the second network and the address information of the source mobility management network element, where the GUTI of the terminal in the second network and the address information of the source mobility management network element are used to handover the terminal to the second converged network device. That is to say, even when the dual registration terminal has switched to a converged network device in the second network and performs a handover procedure in the first network, the dual registration terminal can be guaranteed to be successfully switched to the same converged network device. In conclusion, based on the switching method, the successful switching of the dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance.
In a possible design, the first converged network device sends the GUTI and the address information of the source mobility management network element to the second converged network device according to the address information of the second converged network device, which specifically is: the first converged network device sends address information and indication information of the second converged network device to the source mobility management network element, where the indication information is used to indicate the source mobility management network element to send the GUTI and the address information of the source mobility management network element to the second converged network device according to the address information of the second converged network device. That is, the first converged network device may be directed to the second converged network device by the source mobility management network element.
In a possible design, the first converged network device determines, according to the GUTI, that the terminal accesses the second network through a second converged network device capable of providing a service for a target access device in the first network, specifically: the first converged network device determining that the GUTI is not a GUTI assigned by the first converged network device; and if the first converged network device determines that the mobility management resource pool to which the mobility management element of the GUTI is allocated is the same as the mobility management resource pool to which the first converged network device belongs when serving as the mobility management element in the second network, the first converged network device determines that the terminal accesses the second network through the second converged network device which can provide service for the target access device in the first network. Based on the scheme, the first converged network device can determine that the terminal accesses the second network through a second converged network device capable of providing service for the target access device in the first network once.
In one possible design, the switching method further includes: and the first converged network device acquires the address information of the second converged network device according to the GUTI. For the first converged network device to obtain the relevant description of the address information of the second converged network device according to the GUTI, reference may be made to the second aspect above, which is not described herein again.
In a possible design, the first converged network device determines, according to the GUTI, that the terminal accesses the second network through a second converged network device capable of providing a service for a target access device in the first network, specifically: the first converged network device determining that the GUTI is not a GUTI assigned by the first converged network device; the first converged network device acquires address information of a target mobility management network element which allocates the GUTI to the terminal, and address information of candidate mobility management network elements which can provide service for target access equipment in the first network; under the condition that the information of the target mobility management network element is in the address information of the candidate mobility management network element, the first converged network device determines that the terminal accesses the second network through a second converged network device which can provide service for the target access device in the first network; correspondingly, the switching method further comprises the following steps: the first converged network device determines the address information of the target mobility management network element as the address information of the second converged network device. The second aspect may be referred to for the description of the first converged network device obtaining the address information of the target mobility management element that allocates the GUTI to the terminal, and details are not repeated here. Based on the scheme, the first converged network device can determine that the terminal accesses the second network through a second converged network device capable of providing service for the target access device in the first network once.
In a possible design, the acquiring, by the first converged network device, address information of a candidate mobility management network element capable of providing a service for a target access device in the first network specifically includes: the first converged network device receives address information of the candidate mobility management network elements capable of providing services for the target access device in the first network from the source mobility management network element. The first converged network device obtains address information of candidate mobility management network elements capable of providing service for a target access device in the first network.
In a possible design, the acquiring, by the first converged network device, address information of a candidate mobility management network element capable of providing a service for a target access device in the first network specifically includes: the first converged network device receives the identifier of the target access device from the source mobility management network element or the identifier of the tracking area served by the target access device; the first converged network device obtains address information of candidate mobility management network elements capable of providing service for the target access device in the first network according to the identifier of the target access device or the identifier of the tracking area served by the target access device. Based on the scheme, the first converged network device obtains address information of candidate mobility management network elements capable of providing service for the target access device in the first network.
In a fifth aspect, an access device is provided, where the access device has a function of implementing the method of the first aspect. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
In a sixth aspect, an access device is provided, which includes: a processor and a memory; the memory is configured to store computer executable instructions, and when the access device is running, the processor executes the computer executable instructions stored in the memory, so as to cause the access device to perform the access method according to any one of the above first aspects.
In a seventh aspect, an access device is provided, including: a processor; the processor is configured to couple with the memory, and after reading an instruction in the memory, execute the access method according to any one of the above first aspects according to the instruction.
In an eighth aspect, a computer-readable storage medium is provided, which has instructions stored therein, and when the computer-readable storage medium runs on a computer, the computer is enabled to execute the access method of any one of the first aspect.
In a ninth aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the access method of any of the first aspects above.
In a tenth aspect, an apparatus (for example, the apparatus may be a system on a chip) is provided, where the apparatus includes a processor, configured to support an access device to implement the functions referred to in the first aspect, for example, in a case that it is determined that there is no connection between the first mobility management network element and the access device according to the first mobility management identifier, and in a case that it is determined that there is no connection between the first mobility management network element and the access device, it determines a target converged network device according to the third mobility management identifier. In one possible design, the apparatus further includes a memory for storing necessary program instructions and data for the access device. When the device is a chip system, the device may be composed of a chip, or may include a chip and other discrete devices.
For technical effects brought by any one of the design manners in the fifth aspect to the tenth aspect, reference may be made to technical effects brought by different design manners in the first aspect, and details are not described herein.
In an eleventh aspect, a first converged network device is provided, which has the function of implementing the method of the second or fourth aspect. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
In a twelfth aspect, a first converged network device is provided, including: a processor and a memory; the memory is configured to store computer executable instructions, and when the first converged network device runs, the processor executes the computer executable instructions stored in the memory, so as to enable the first converged network device to perform the access method according to any one of the second aspects or the handover method according to any one of the fourth aspects.
In a thirteenth aspect, a first converged network device is provided, including: a processor; the processor is configured to couple with the memory, and after reading the instruction in the memory, execute the access method according to any one of the second aspects or the handover method according to any one of the fourth aspects according to the instruction.
In a fourteenth aspect, a computer-readable storage medium is provided, which has instructions stored therein, and when the instructions are executed on a computer, the computer is enabled to execute the access method of any one of the above second aspects or the handover method of any one of the above fourth aspects.
In a fifteenth aspect, there is provided a computer program product comprising instructions which, when run on a computer, enable the computer to perform the access method of any of the above second aspects or the handover method of any of the above fourth aspects.
In a sixteenth aspect, an apparatus (for example, the apparatus may be a chip system) is provided, where the apparatus includes a processor configured to enable a first converged network device to implement the functions related to the second aspect or the fourth aspect, for example, to determine, according to the GUTI, that a second converged network device to which the terminal is connected through the access device accesses the second network. In one possible design, the apparatus further includes a memory for storing program instructions and data necessary for the first converged network device. When the device is a chip system, the device may be composed of a chip, or may include a chip and other discrete devices.
For technical effects brought by any one of the design manners in the eleventh aspect to the sixteenth aspect, reference may be made to technical effects brought by different design manners in the second aspect or the fourth aspect, and details are not described herein again.
A seventeenth aspect provides a source mobility management network element having functionality to implement the method of the third aspect. The function can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
In an eighteenth aspect, there is provided a source mobility management network element, comprising: a processor and a memory; the memory is configured to store computer-executable instructions, and when the source mobility management element is running, the processor executes the computer-executable instructions stored by the memory to cause the source mobility management element to perform the handover method according to any one of the third aspect.
In a nineteenth aspect, there is provided a source mobility management network element, comprising: a processor; the processor is configured to be coupled with the memory, and after reading the instruction in the memory, execute the switching method according to any one of the third aspects.
A twentieth aspect provides a computer-readable storage medium having stored therein instructions which, when run on a computer, cause the computer to perform the handover method of any one of the third aspects above.
In a twenty-first aspect, there is provided a computer program product comprising instructions which, when run on a computer, cause the computer to perform the handover method of any of the above-mentioned third aspects.
In a twenty-second aspect, an apparatus (for example, the apparatus may be a system-on-chip) is provided, which includes a processor configured to enable a source mobility management network element to implement the functions recited in the above-mentioned third aspect, for example, to obtain an identification list and address information of a candidate mobility management network element according to an identification of the second access device or an identification of the tracking area. In one possible design, the apparatus further includes a memory that stores program instructions and data necessary for the source mobility management network element. When the device is a chip system, the device may be composed of a chip, or may include a chip and other discrete devices.
For technical effects brought by any one of the design manners in the seventeenth aspect to the twenty-second aspect, reference may be made to technical effects brought by different design manners in the third aspect, and details are not described here.
A twenty-third aspect provides an access system comprising a converged network device and an access device in a first network; the access device is configured to receive an access request from a terminal, where the access request carries a first mobility management identifier and a third mobility management identifier, where the first mobility management identifier is an identifier of a first mobility management network element in the first network, and the third mobility management identifier is a mapped mobility management identifier in the first network that is mapped by a mobility management identifier in a globally unique temporary identifier GUTI of the terminal in the second network, where the first network and the second network are different types of networks; the access device is further configured to determine, according to the third mobility management identifier, a target converged network device and send the access request to the target converged network device when it is determined that there is no connection between the first mobility management network element and the access device according to the first mobility management identifier, where a mapped mobility management identifier in the first network corresponding to the target converged network device serving as a mobility management network element in the second network is the third mobility management identifier; the target converged network device is configured to receive the access request from the access device, where the access request is used for the terminal to access the first network through the target converged network device.
In a twenty-fourth aspect, there is provided an access system comprising: a first converged network device, a second converged network device and an access device in a first network; the access device is configured to send an access request to the first converged network device, where the access request carries a globally unique temporary identifier GUTI of a terminal in a second network, and the first network and the second network are different types of networks; the first converged network device is configured to receive the access request from the access device, and determine, according to the GUTI, that the terminal accesses the second network through a second converged network device to which the access device is connected; the first converged network device is further configured to send the access request to the second converged network device; the second converged network device is configured to receive the access request from the first converged network device, where the access request is used for the terminal to access the first network through the second converged network device.
In a twenty-fifth aspect, there is provided a switching system comprising: the system comprises a first access device in a first network, a source mobile management network element in the first network and a target convergence network device; the first access device is configured to send a handover requirement to the source mobility management network element, where the handover requirement carries an identifier of a second access device of the first network or an identifier of a tracking area served by the second access device, and a globally unique temporary identifier GUTI of the terminal in a second network, where the first network and the second network are different types of networks; the source mobility management network element is configured to receive the handover request from the first access device, and obtain an identifier list and address information of a candidate mobility management network element according to an identifier of the second access device or an identifier of the tracking area; the source mobility management network element is further configured to determine a target converged network device according to the GUTI and the identifier list of the candidate mobility management network element, where the target converged network device is a converged network device corresponding to one identifier in the identifier list of the candidate mobility management network element; the source mobility management network element is further configured to send a request message to the target converged network device according to the address information of the target converged network device included in the address information of the candidate mobility management network element; the target converged network device is further configured to receive the request message from the source mobility management network element, where the request message is used to handover the terminal to the target converged network device.
In a twenty-sixth aspect, there is provided a switching system comprising: a first converged network device, a second converged network device, and a source mobility management network element in a first network; the source mobility management network element is configured to send, to the first converged network device, address information of the source mobility management network element and a globally unique temporary identifier GUTI of a terminal in a second network, where the first network and the second network are different types of networks; the first converged network device is configured to receive the address information of the source mobility management network element and the GUTI from the source mobility management network element, and determine, according to the GUTI, that the terminal has accessed the second network through a second converged network device capable of providing a service for a target access device in the first network; the first converged network device is further configured to send the GUTI and the address information of the source mobility management network element to the second converged network device according to the address information of the second converged network device; the second converged network device is further configured to receive the GUTI from the first converged network device and address information of the source mobility management network element, where the GUTI and the address information of the source mobility management network element are used to handover the terminal to the second converged network device.
These and other aspects of the present application will be more readily apparent from the following description of the embodiments.
Drawings
Fig. 1 is a first schematic architecture diagram of an access system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of an access system according to an embodiment of the present application;
fig. 3 is a first schematic diagram of a switching system according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a handover system according to an embodiment of the present application;
fig. 5 is a schematic application diagram of an access system or a handover system in a 4G network and a 5G network according to an embodiment of the present disclosure;
fig. 6 is a schematic hardware structure diagram of a communication device according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a network deployment of an MME and an E-UTRAN device in a 4G network;
FIG. 8 is a diagram illustrating the identification of E-UTRAN equipment and the format of 4G-TAI in the existing 4G network;
fig. 9 is a schematic diagram of network deployment of AN AMF network element and AN NG-AN device in a conventional 5G network;
FIG. 10 is a schematic diagram of the identification of NG-AN devices and the format of a 5G-TAI in a conventional 5G network;
FIG. 11 is a schematic diagram of the formats of GUMMEI and 4G-GUTI in the existing 4G network;
FIG. 12 is a schematic diagram of the format of GUAMI and 5G-GUTI in the existing 5G network;
FIG. 13 is a diagram illustrating a mapping between GUMMEI and GUAMI in the prior art;
fig. 14 is a first flowchart of an access method according to an embodiment of the present application;
fig. 15 is a second flowchart of an access method according to an embodiment of the present application;
fig. 16 is a third flowchart of an access method according to the embodiment of the present application;
fig. 17 is a fourth flowchart of an access method according to the embodiment of the present application;
fig. 18 is a fifth flowchart of an access method according to an embodiment of the present application;
fig. 19 is a sixth schematic flowchart of an access method according to an embodiment of the present application;
fig. 20 is a first flowchart illustrating a handover method according to an embodiment of the present application;
fig. 21 is a second flowchart illustrating a handover method according to an embodiment of the present application;
fig. 22 is a third schematic flowchart of a handover method according to an embodiment of the present application;
fig. 23 is a fourth schematic flowchart of a handover method according to an embodiment of the present application;
fig. 24 is a fifth flowchart of a handover method according to an embodiment of the present application;
fig. 25 is a sixth schematic flowchart of a handover method according to an embodiment of the present application;
fig. 26 is a schematic structural diagram of an access device according to an embodiment of the present application;
fig. 27 is a first schematic structural diagram of a first converged network device according to an embodiment of the present application;
fig. 28 is a schematic structural diagram of a source mobility management network element according to an embodiment of the present application;
fig. 29 is a schematic structural diagram of a first converged network device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. Where in the description of the present application, "/" indicates a relationship where the objects associated before and after are an "or", unless otherwise stated, for example, a/B may indicate a or B; in the present application, "and/or" is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. Also, in the description of the present application, "a plurality" means two or more than two unless otherwise specified. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or multiple. In addition, in order to facilitate clear description of technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
In addition, the network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not constitute a limitation to the technical solution provided in the embodiment of the present application, and it can be known by a person skilled in the art that the technical solution provided in the embodiment of the present application is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.
It should be noted that, in the following embodiments of the present application, all terminals related to are dual-registration terminals, where a dual-registration terminal refers to a terminal that can simultaneously register in different types of networks at the same time, but does not perform a network reselection or handover procedure between different types of networks, and the description of the dual-registration terminal is unified here and will not be repeated below.
As shown in fig. 1, an access system 10 provided for the embodiment of the present application includes a target converged network device 101 and an access device 102 in a first network. The target converged network device 101 integrates the functions of the third mobility management network element 1011 in the first network and the fourth mobility management network element 1012 in the second network, and may be used as the third mobility management network element 1011 in the first network or the fourth mobility management network element 1012 in the second network; the first network and the second network are different types of networks, and are described in a unified manner herein, and are not described in detail below.
The access device 102 is configured to receive an access request from a terminal, where the access request carries a first mobility management identifier and a third mobility management identifier. The first mobility management identifier is an identifier of a first mobility management network element in the first network, and the third mobility management identifier is a mapping mobility management identifier in the first network obtained by mapping a mobility management identifier in a Globally Unique Temporary Identifier (GUTI) of the terminal in the second network.
The access device 102 is further configured to, when it is determined that there is no connection between the first mobility management element and the access device 102 according to the first mobility management identifier, determine the target converged network device 101 according to a third mobility management identifier, and send an access request to the target converged network device 101, where a mapped mobility management identifier in the first network corresponding to the target converged network device 101 serving as a fourth mobility management element 1012 in the second network is the third mobility management identifier.
The target converged network device 101 is configured to receive an access request from an access device, where the access request is used for a terminal to access a first network through the target converged network device 101.
Optionally, in this embodiment of the present application, the target converged network device 101 and the access device 102 may communicate directly or may communicate through forwarding of other devices, which is not specifically limited in this embodiment of the present application.
Optionally, as shown in fig. 2, for another access system 20 provided in the embodiment of the present application, the access system 20 includes: a first converged network device 201, a second converged network device 202 and an access device 203 in the first network. The first label convergence network device 201 integrates a function of a third mobility management element 2011 in the first network and a function of a fourth mobility management element 2012 in the second network, and may serve as the third mobility management element 2011 in the first network or the fourth mobility management element 2012 in the second network; the second label-convergence network device 202 integrates the function of the fifth mobility management element 2021 in the first network and the function of the sixth mobility management element 2022 in the second network, and may be used as the fifth mobility management element 2021 in the first network or the sixth mobility management element 2022 in the second network; the first network and the second network are different types of networks, and are described in a unified manner herein, and are not described in detail below.
The access device 203 is configured to send an access request to the first converged network device 201, where the access request carries a GUTI of the terminal in the second network.
The first converged network device 201 is configured to receive an access request from the access device 203, and determine, according to the GUTI, that the second converged network device 202 to which the terminal has been connected through the access device 203 accesses the second network.
The first converged network device 201 is further configured to send an access request to the second converged network device 202.
The second converged network device 202 is configured to receive an access request from the first converged network device 201, where the access request is used for the terminal to access the first network through the second converged network device 202.
Optionally, in this embodiment of the present application, any two devices of the first converged network device 201, the second converged network device 202, and the access device 203 may communicate directly or may communicate through forwarding of other devices, which is not specifically limited in this embodiment of the present application.
Based on the access system provided in the embodiment shown in fig. 1 or fig. 2, on one hand, since the converged network devices (such as the target converged network device in fig. 1, or the first converged network device and the second converged network device in fig. 2) in the access system both integrate the functions of the mobility management network element in the first network and the functions of the mobility management network element in the second network, the number of devices in the network is reduced, and the workload of network operation and maintenance is simplified; network address resources are reduced, and complexity of network planning and deployment is simplified; moreover, the occupation proportion of the hardware resources can be flexibly adjusted according to the traffic of the first network and the second network, and the hardware resources are shared, so that the resource utilization efficiency and the return on investment are improved. On the other hand, in the access system provided in the embodiment shown in fig. 1, the access request received by the access device in the first network not only carries the identifier of the first mobility management element in the first network, but also carries the mapping mobility management identifier in the first network obtained by mapping the mobility management identifier in the GUTI of the terminal in the second network, so that when the access device determines that the access device is not connected to the first mobility management element according to the first mobility management identifier, the access device may determine, according to the third mobility management identifier, the target converged network device, where the mapping mobility management identifier in the first network corresponding to the target converged network device serving as the fourth mobility management element in the second network is the third mobility management identifier; in the access system provided in the embodiment shown in fig. 2, an access device in a first network carries a GUTI of a terminal in a second network in an access request sent to a first converged network device by an access device in a first network, so that the first converged network device can determine, according to the GUTI, that the terminal has accessed the second network through a second converged network device connected to the access device, and then the first converged network device can send an access request to the second converged network device, where the access request is used for the terminal to access the first network through the second converged network device. That is, based on the access system provided in the embodiment shown in fig. 1 or fig. 2, in the case that the dual registration terminal has selected one converged network device in the second network, when re-accessing is performed in the first network, it can be ensured that the same converged network device is selected, and re-access of the dual registration terminal is achieved. In summary, based on the access system provided in the embodiment shown in fig. 1 or fig. 2, the dual registration terminal can be re-accessed on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance.
Optionally, as shown in fig. 3, for a switching system 30 provided in the embodiment of the present application, the switching system 30 includes: a target converged network device 301, a first access device 302 in a first network and a source mobility management network element 303 in the first network. The target converged network device 301 integrates the function of the third mobility management element 3011 in the first network and the function of the fourth mobility management element 3012 in the second network, and may serve as the third mobility management element 3011 in the first network or the fourth mobility management element 3012 in the second network; the first network and the second network are different types of networks, and are described in a unified manner herein, and are not described in detail below.
The first access device 302 is configured to send a handover requirement to the source mobility management network element 303, where the handover requirement carries an identifier of a second access device of the first network or an identifier of a tracking area served by the second access device, and a GUTI of the terminal in the second network.
The source mobility management element 303 is configured to receive a handover request from the first access device 302, and obtain an identifier list and address information of candidate mobility management elements according to an identifier of the second access device or an identifier of the tracking area.
The source mobility management network element 303 is further configured to determine the target converged network device 301 according to the GUTI and the identifier list of the candidate mobility management network element, where the target converged network device 301 is a converged network device corresponding to one identifier in the identifier list of the candidate mobility management network element;
the source mobility management network element 303 is further configured to send a request message to the target converged network device 301 according to the address information of the target converged network device 301 included in the address information of the candidate mobility management network element.
The target converged network device 301 is further configured to receive a request message from the source mobility management network element 303, where the request message is used to handover the terminal to the target converged network device 301.
Optionally, any two devices in the target convergence network device 301, the first access device 302, and the source mobility management network element 303 in this embodiment of the application may communicate directly with each other, or communicate through forwarding of other devices, which is not specifically limited in this embodiment of the application.
Optionally, as shown in fig. 4, for a switching system 40 provided in the embodiment of the present application, the switching system 40 includes: a first converged network device 401, a second converged network device 402 and a source mobility management network element 403 in the first network. The first label convergence network device 401 integrates the function of the third mobility management network element 4011 in the first network and the function of the fourth mobility management network element 4012 in the second network, and may serve as the third mobility management network element 4011 in the first network or the fourth mobility management network element 4012 in the second network; the second label fusion network device 402 integrates the function of the fifth mobility management network element 4021 in the first network and the function of the sixth mobility management network element 4022 in the second network, and may be used as the fifth mobility management network element 4021 in the first network or as the sixth mobility management network element 4022 in the second network; the first network and the second network are different types of networks, and are described in a unified manner herein, and are not described in detail below.
The source mobility management element 403 is configured to send, to the first converged network device 401, address information of the source mobility management element 403 and a GUTI of the terminal in the second network.
The first converged network device 401 is configured to receive address information of a source mobility management network element from the source mobility management network element 403 and a GUTI of the terminal in the second network, and determine, according to the GUTI, that the terminal has accessed the second network through the second converged network device 402 capable of providing a service for a target access device in the first network;
the first converged network device is further configured to send, to the second converged network device, the GUTI of the terminal in the second network and the address information of the source mobility management network element 403 according to the address information of the second converged network device 402;
the second converged network device 402 is further configured to receive the GUTI of the terminal in the first converged network device in the second network and the address information of the source mobility management network element 403, where the GUTI of the terminal in the second network and the address information of the source mobility management network element 403 are used to handover the terminal to the second converged network device 402.
Optionally, in this embodiment of the present application, any two devices in the first converged network device 401, the second converged network device 402 and the source mobility management network element 403 may communicate directly with each other, or may communicate through forwarding of other devices, which is not specifically limited in this embodiment of the present application.
Based on the handover system provided in the embodiments shown in fig. 3 or fig. 4, on one hand, since the converged network devices (such as the target converged network device in fig. 3, or the first converged network device and the second converged network device in fig. 4) in the handover system both integrate the functions of the mobility management network element in the first network and the functions of the mobility management network element in the second network, the number of devices in the network is reduced, and the workload of network operation and maintenance is simplified; network address resources are reduced, and complexity of network planning and deployment is simplified; moreover, the occupation proportion of the hardware resources can be flexibly adjusted according to the traffic of the first network and the second network, and the hardware resources are shared, so that the resource utilization efficiency and the return on investment are improved. On the other hand, in the handover system provided in the embodiment shown in fig. 3, the source mobility management network element in the first network receives the handover request from the first access device, where the handover request carries not only the identifier of the second access device of the first network or the identifier of the tracking area served by the second access device, but also the GUTI of the terminal in the second network, so that the source mobility management network element may obtain the identifier list and the address information of the candidate mobility management network element according to the identifier of the second access device or the identifier of the tracking area, may determine the target convergence network device according to the GUTI and the identifier list of the candidate mobility management network element, and further may send a request message to the target convergence network device, where the request message is used to handover the terminal to the target convergence network device; in the handover system provided in the embodiment shown in fig. 4, the first converged network device may receive the address information of the source mobility management network element from the source mobility management network element in the first network and the GUTI of the terminal in the second network, and may determine, according to the GUTI of the terminal in the second network, that the terminal has accessed the second network through the second converged network device 402 capable of providing a service for the target access device in the first network, and further the first converged network device may send, to the second converged network device, the GUTI of the terminal in the second network and the address information of the source mobility management network element, where the GUTI of the terminal in the second network and the address information of the source mobility management network element are used to handover the terminal to the second converged network device. That is, based on the switching system provided in the embodiment shown in fig. 3 or fig. 4, even when the dual registration terminal has switched to one converged network device in the second network, when the switching process is performed in the first network, it can be ensured that the dual registration terminal is successfully switched to the same converged network device. In summary, based on the switching system provided in the embodiment shown in fig. 3 or fig. 4, on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance, the successful switching of the dual registration terminals can be realized.
Optionally, the first network in the embodiments shown in fig. 1 to 4 may be a 4G network, and the second network may be a 5G network; alternatively, the first network in this embodiment may be a 5G network, and the second network may be a 4G network; alternatively, the first network and the second network in the embodiment of the present application may also be other networks, which is not specifically limited in the embodiment of the present application.
Illustratively, the first network is a 4G network, and the second network is a 5G network; or, in a scenario that the second network is a 4G network and the first network is a 5G network, as shown in fig. 5, the converged network device integrates the functions of the MME in the 4G network and the AMF network element in the 5G network. Under the condition that the converged network device serves as an MME, the corresponding access device is evolved universal terrestrial radio access network (E-UTRAN) equipment in a 4G network; under the condition that the converged network device serves as AN AMF network element, the corresponding access device is a next generation-access network (NG-AN) device in a 5G network. The converged network device may be, for example, a target converged network device in fig. 1 or fig. 3, or a first converged network device in fig. 2 or fig. 4, or a second converged network device in fig. 2 or fig. 4, and the like, which is not specifically limited in this embodiment of the application.
In addition, as shown in fig. 5, the access system or the handover system may further include one or more of an MME and an AMF network element, which is not specifically limited in this embodiment of the present application. For example, when the first network is a 4G network and the second network is a 5G network, the network or entity corresponding to the source mobility management network element in fig. 3 or fig. 4 may be the MME in fig. 5; or, when the first network is a 5G network and the second network is a 4G network, the network or the entity corresponding to the source mobility management network element in fig. 3 or fig. 4 may be the AMF network element in fig. 5, which is not specifically limited in this embodiment of the present application.
The converged network device in the implementation of the application configures a 'home terminal address of a uniform peer network element interface'. Under the condition that the converged network device is used as an AMF network element and communicated with the AMF network element, the home terminal address is used as an N14 interface address; under the condition that the converged network device is used as an AMF network element and communicated with an MME network element, the home terminal address is used as an N26 interface address; under the condition that the converged network device is used as an MME to communicate with an AMF network element, the home terminal address is used as an N26 interface address; in the case where the converged network device communicates with the MME as the MME, the home terminal address is an S10 interface address.
The converged network device configures 'home terminal address of unified wireless device interface'. Under the condition that the converged network equipment is used as AN AMF network element to communicate with the NG-AN equipment, the home terminal address is used as AN N2 interface address; in the case where the converged network device communicates with the E-UTRAN device as the MME, the home address serves as the S1-MME interface address.
In addition, the E-UTRAN device may further communicate with the MME through AN S1-MME interface, and the NG-AN device may further communicate with the AMF network element through AN N2 interface, which may specifically refer to descriptions of the existing 4G network and 5G network, and is not described herein again.
It should be noted that fig. 5 is only an exemplary illustration of an access system or a handover system including a converged network device. Of course, the access system or the handover system may include one or more converged network devices, which is not specifically limited in this embodiment of the present application.
It should be noted that fig. 5 is only an example of connection with an E-UTRAN device when the converged network device is used as an MME. Of course, when the converged network device serves as an MME, the converged network device may be connected to one or more E-UTRAN devices, which is not specifically limited in this embodiment of the present application.
It should be noted that fig. 5 is only an example of connection between the converged network device and an AMF network element or an MME when the converged network device is used as the MME. Of course, the converged network device may be connected to one or more MMEs when serving as an MME, or may be connected to one or more AMF network elements when serving as an MME, which is not specifically limited in this embodiment of the present application.
It should be noted that fig. 5 is only AN exemplary illustration of a connection with AN NG-AN device when the converged network device is used as AN AMF network element. Of course, when the converged network device serves as AN AMF network element, the converged network device may be connected to one or more NG-AN devices, which is not specifically limited in this embodiment of the present application.
It should be noted that fig. 5 is only an example of connection between the converged network device and an AMF network element or an MME when the converged network device is used as the AMF network element. Of course, the converged network device may be connected to one or more MMEs when serving as an AMF network element, or may be connected to one or more AMF network elements when serving as an AMF network element, which is not specifically limited in this embodiment of the present application.
It should be noted that fig. 5 is only an exemplary illustration of the connection of the E-UTRAN device with a converged network device. Of course, the E-UTRAN device may also be connected to other converged network devices or MMEs, which is not specifically limited in this embodiment of the present application.
It should be noted that fig. 5 is only AN exemplary illustration of connection between the NG-AN device and a converged network device. Of course, the NG-AN device may also be connected to other converged network devices or AMF network elements, which is not specifically limited in this embodiment of the present application.
Optionally, the terminal (terminal) referred to in the embodiments of the present application may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to a wireless modem; a subscriber unit (subscriber unit), a cellular phone (cellular phone), a smart phone (smart phone), a wireless data card, a Personal Digital Assistant (PDA) computer, a tablet computer, a wireless modem (modem), a handheld device (dhhand), a laptop computer (laptop computer), a cordless phone (cordless phone) or a Wireless Local Loop (WLL) station, a Machine Type Communication (MTC) terminal, a User Equipment (UE), a Mobile Station (MS), a terminal equipment (terminal device) or a relay user equipment, etc. may also be included. The relay user equipment may be, for example, a 5G home gateway (RG). For convenience of description, the above-mentioned devices are collectively referred to as a terminal in this application.
Optionally, the access device, or the first access device, or the second access device referred to in this embodiment of the present application refers to a device that accesses a core network, and may be, for example, a base station, a broadband network service gateway (BNG), an aggregation switch, a non-third generation partnership project (3 GPP) access device, or the like. The base stations may include various forms of base stations, such as: macro base stations, micro base stations (also referred to as small stations), relay stations, access points, etc.
Optionally, in the embodiment of the present application, the access device in fig. 1, the first converged network device in fig. 2, the source mobility management network element in fig. 3, or the first converged network device in fig. 4 may be implemented by one device, or implemented by multiple devices together, or implemented by one functional module in one device, which is not specifically limited in this embodiment of the present application. It is understood that the above functions may be either network elements in a hardware device, software functions running on dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform).
For example, in the embodiment of the present application, the access device in fig. 1, the first converged network device in fig. 2, the source mobility management network element in fig. 3, or the first converged network device in fig. 4 may be implemented by the communication device in fig. 6. Fig. 6 is a schematic diagram illustrating a hardware structure of a communication device according to an embodiment of the present application. The communication device 600 includes a processor 601, communication circuitry 602, memory 603, and one or more communication interfaces (illustrated in fig. 6 as communication interface 604 for example only).
The processor 601 may be a general processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more ics for controlling the execution of programs in accordance with the present disclosure.
The communication link 602 may include a path for transmitting information between the aforementioned components.
The communication interface 604 may be any device, such as a transceiver, for communicating with other devices or communication networks, such as an ethernet, a Radio Access Network (RAN), a Wireless Local Area Network (WLAN), etc.
The memory 603 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a Random Access Memory (RAM) or other type of dynamic storage device that can store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disk storage, optical disk storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory may be separate and coupled to the processor via a communication link 602. The memory may also be integral to the processor.
The memory 603 is used for storing computer-executable instructions for executing the present application, and is controlled by the processor 601 to execute the instructions. The processor 601 is configured to execute computer-executable instructions stored in the memory 603, so as to implement the access method or the handover method provided by the following embodiments of the present application.
Optionally, the computer-executable instructions in the embodiments of the present application may also be referred to as application program codes, which are not specifically limited in the embodiments of the present application.
In particular implementations, processor 601 may include one or more CPUs such as CPU0 and CPU1 in fig. 6 as an example.
In particular implementations, communication device 600 may include multiple processors, such as processor 601 and processor 608 of fig. 6, for example, as an example. Each of these processors may be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
In particular implementations, communication device 600 may also include an output device 605 and an input device 606, as one embodiment. Output device 605 is in communication with processor 601 and may display information in a variety of ways. For example, the output device 605 may be a Liquid Crystal Display (LCD), a Light Emitting Diode (LED) display device, a Cathode Ray Tube (CRT) display device, a projector (projector), or the like. The input device 606 is in communication with the processor 601 and may receive user input in a variety of ways. For example, the input device 606 may be a mouse, a keyboard, a touch screen device, or a sensing device, among others.
The communication device 600 described above may be a general purpose device or a special purpose device. In a specific implementation, the communication device 600 may be a desktop, a laptop, a web server, a Personal Digital Assistant (PDA), a mobile phone, a tablet, a wireless terminal device, an embedded device, or a device with a similar structure as in fig. 6. The embodiment of the present application does not limit the type of the communication apparatus 600.
The access method or the handover method provided in the embodiment of the present application will be specifically described below with reference to fig. 1 to 6.
It should be noted that, in the following embodiments of the present application, names of messages between network elements or names of parameters in messages are only an example, and other names may also be used in a specific implementation, which is not specifically limited in this embodiment of the present application.
To facilitate understanding of the schemes in the following examples, the relevant brief description is first given below.
First, an identity of an E-UTRAN device in a 4G network and an identity of a Tracking Area Identity (TAI) served by the E-UTRAN device in the 4G network (hereinafter referred to as 4G-TAI):
in a 4G network, each MME may be connected to a plurality of E-UTRAN devices covering a set of Tracking Areas (TAs), which represent the coverage area of a 4G wireless network. For example, as shown in fig. 7, the MME11 may be connected to E-UTRAN11 device and E-UTRAN12 device, respectively, and the MME12 may be connected to E-UTRAN11 device and E-UTRAN12 device, respectively, where the E-UTRAN11 device, E-UTRAN12 device, etc. may cover location area 1, and the location area 1 includes TA11, TA12, and … … TA1 n. MME21 may be connected with E-UTRAN21 and E-UTRAN22 devices, respectively, MME22 may be connected with E-UTRAN21 and E-UTRAN22 devices, respectively, where E-UTRAN21 and E-UTRAN22 devices, etc. may cover location area 2, and location area 2 includes TA21, TA22, … … TA2 m. Wherein m and n are integers.
The globally unique identifier of the 4G-TA is referred to as a 4G-TAI, and its composition structure is shown in fig. 8, and includes a Mobile Country Code (MCC), a Mobile Network Code (MNC), and a Tracking Area Code (TAC) of 16 bits. Wherein the MCC identifies the country to which the operator belongs; the MNC is the network identification of the operator; the TAC uniquely identifies a location area under MCC + MNC.
The identity of the E-UTRAN device can be referred to as an Identity (ID) of a global evolved base station (eNB), and the structure thereof is shown in FIG. 8, which includes MCC, MNC, and eNB IDs of 18bit, 20bit, 21bit or 28 bit. Wherein the MCC identifies the country to which the operator belongs; the MNC is the network identification of the operator; the eNB ID uniquely identifies an E-UTRAN device under MCC + MNC.
Secondly, the identification of the NG-AN device in the 5G network and the TAI (hereinafter referred to as 5G-TAI) served by the NG-AN device in the 5G network:
in a 5G network, each AMF network element will be connected to multiple NG-AN devices, which cover a group of TAs, representing the coverage area of a 5G wireless network. For example, as shown in fig. 9, the AMF11 network element may be connected with NG-AN11 device and NG-AN12 device, respectively, and the AMF12 network element may be connected with NG-AN11 device and NG-AN12 device, respectively, wherein the NG-AN11 device, the NG-AN11 device, and the like may cover location area 1, and location area 1 includes TA11, TA12, and … … TA1 n. The AMF21 network element may be connected with NG-AN21 device and NG-AN22 device, respectively, and the AMF22 network element may be connected with NG-AN21 device and NG-AN22 device, respectively, wherein the NG-AN21 device, NG-AN22 device, etc. may cover location area 2, and location area 2 includes TA21, TA22, … … TA2 m.
The globally unique identifier of the 5G-TA is referred to as 5G-TAI, and the composition structure of the globally unique identifier is shown in FIG. 10, and includes MCC and MNC, and 24-bit TAC. Wherein the MCC identifies the country to which the operator belongs; the MNC is the network identification of the operator; the TAC uniquely identifies a location area under MCC + MNC.
The identity of the NG-AN device can be referred to as global AN device ID, which is structured as shown in fig. 10, and includes MCC, MNC, and 18-32 bit AN device ID. Wherein the MCC identifies the country to which the operator belongs; the MNC is the network identification of the operator; AN NG-AN device is uniquely identified under AN device ID.
As can be seen from the above description, the 4G network compares with the 5G network: the 4G-TAC is 8 bits less than the 5G-TAC, namely one byte; the global eNB ID of the 4G network differs from the global AN device ID of the 5G network in length range.
Third, globally unique MME identifier (GUMMEI) in 4G network is similar to 4G-gummi:
the formats of the GUMMEI and 4G-GUTI in the 4G network are shown in fig. 11. The GUMMEI is composed of MCC and MNC corresponding to the MME, an MME group identification (MME group ID) of 16 bits and an MME code (MME code) of 8 bits. The 4G-GUTI consists of a GUMMEI and an MME-temporary mobile subscriber identity (M-TMSI) of 32 bit.
Wherein the MCC identifies the country to which the operator belongs; the MNC is the network identification of the operator; the MME group ID represents a group of MMEs serving the same Tracking Area (TA) range, which is also referred to as an MME pool (MMEpool); the MME code uniquely identifies one MME in the MME pool. The MME group ID and MME code are combined together to be referred to as MME identity (MMEI), which is unique under a set of MCC and MNC.
Fourth, globally unique AMF identifier (GUAMI) in 5G network is compared with 5G-guiti:
the format of the GUAMI and 5G-GUTI in the 5G network is shown in fig. 12. The GUAMI is composed of MCC and MNC corresponding to AMF network elements, 8-bit AMF area identification (AMF region ID), 10-bit AMF set identification (AMF set ID) and 6-bit AMF pointer (AMF pointer). The 5G-GUTI consists of GUAMI and 32bit 5G-TMSI.
Wherein the MCC identifies the country to which the operator belongs; the MNC is the network identification of the operator; the amaf region ID and AMFset ID taken together represent a set of AMF network elements serving the same TA range, which is also called an AMF pool (AMF pool); the amaf region ID, the AMF set ID, and the AMF pointer are collectively referred to as an AMF identifier (AMI), and are unique under a set of MCCs and MNCs. The AMF region ID is unique under a set of MCC and MNC, and the AMF set ID is unique under the AMF region ID.
Fifth, the mapping method between GUAMI and GUMMEI defined by the current 3GPP protocol is as follows:
MCC in GUAMI is mapped to MCC in GUMMEI, MNC in GUAMI is mapped to MNC in GUMMEI; mapping AMF area identification in GUAMI to high 8bit of MME group identification in GUMMEI; mapping the high 8bit in the AMF set identifier in the GUAMI to the low 8bit in the MME group identifier in the GUMMEI; mapping a low 2bit in an AMF set identifier in GUAMI to a high 2bit of an MME code in GUMMEI; the AMF pointer in GUAMI maps to the lower 6 bits of the MME code in GUMMEI. The mapping result is shown in fig. 13.
A specific description of the access method or the handover method provided in the embodiments of the present application will be given below with reference to the above description.
Optionally, taking as an example that the first network in the access system shown in fig. 1 is a 4G network, the second network is a 5G network, and the E-UTRAN device can ensure that a correct converged network device is selected for the dual registration terminal for the first time to process, as shown in fig. 14, an access method provided in the embodiment of the present application includes the following steps:
s1401, the E-UTRAN device sends S1 setup request (S1 setup request) message to the converged network device, so that the converged network device receives the S1 setup request message from the E-UTRAN device.
Wherein the S1 setup request message is used to request registration to the converged network device.
S1402, the converged network device sends S1 setup response (S1 setup response) message to the E-UTRAN device, so that the E-UTRAN device receives the S1 setup response message from the converged network device.
Wherein the S1 setup response message carries two sets of GUMMEI. The group of GUMMEIs are corresponding GUMMEIs when the converged network equipment is used as an MME, are recorded as original (native) GUMMEIs and represent 4G network equipment; the group of GUMMEIs are GUMMEIs obtained by mapping original (native) GUAMIs corresponding to the converged network equipment serving as AMF network elements, are recorded as mapped GUMMEIs and represent 5G network equipment.
Optionally, in this embodiment of the application, the AMF pool and the MME pool in the network may be planned independently. For example, the original GUAMI and the original GUMMEI to which the device belongs are configured on the converged network device respectively. Or, in this embodiment of the present application, the original GUMMEI corresponding to the converged network device when serving as the MME and the original gummi corresponding to the converged network device when serving as the AMF network element may also be obtained in other manners, for example, one or more globally unique identifiers may be configured for the converged network device, and the original gummi and the original GUMMEI may be mapped by the one or more globally unique identifiers corresponding to the converged network device, which is not specifically limited in this embodiment of the present application.
The mapping GUMMEI obtained by mapping the original GUAMI according to the prior art in the embodiment of the present application is not the same as the GUMMEI of any MME in the network, nor the same as the GUMMEI obtained by mapping the original GUAMI of other AMF network elements in the network according to the prior art, and is described in this specification in a unified manner, and is not described again below.
Optionally, in this embodiment of the application, different GUMMEI in a group of GUMMEI may belong to one MME pool, that is, the MCC, MNC, and MME group identifiers are all the same; or may belong to multiple MME pools, that is, one or more of MCC, MNC, or MME Group ID is different, and this is not particularly limited in this embodiment of the application.
Optionally, in this embodiment of the application, the S1 setup response message may further carry weight information corresponding to the converged network device serving as the MME, where the weight information may be determined according to the weight information of the converged network device, for example, the weight information of the converged network device is mapped to the weight information corresponding to the converged network device serving as the MME according to a certain ratio, which is not specifically limited in this embodiment of the application.
It should be noted that, in this embodiment of the present application, the weight information of the converged network device represents the processing capability of the converged network device in the converged network device pool to which the converged network device belongs, compared with other converged network devices. Generally, the greater the processing capability, the higher the weight of the converged network device, which is described in the unified manner herein and will not be described in detail below.
It should be noted that the above steps S1401-S1402 are optional steps, and are only exemplified to illustrate that the E-UTRAN device interacts with one of the connected converged network devices to obtain two sets of GUMMEI corresponding to the converged network device. Certainly, the E-UTRAN device may also be connected to other converged network devices or MME, wherein the above steps S1401 to S1402 may be referred to in a manner of interacting with other converged network devices to obtain two sets of GUMMEI corresponding to the converged network devices; the method for interacting with the MME to obtain the original GUMMEI corresponding to the MME may refer to the prior art, and is not described herein again. Furthermore, after the E-UTRAN device obtains the original GUMMEI fed back by the one or more connected converged network devices or MMEs, the E-UTRAN device may determine the following network topology relationship according to the original GUMMEI fed back by the one or more converged network devices or MMEs connected to the E-UTRAN device:
first, the number of MME pool connected to the E-UTRAN device, and the MCC, MNC and MME group ID corresponding to each MME pool.
Second, the number of MMEs under each MME pool, and the MME code and communication address of each MME.
S1403, the terminal sends an attach/Tracking Area Update (TAU) request message to the E-UTRAN device, so that the E-UTRAN device receives the attach/TAU request message from the terminal.
If the terminal accesses the 4G network for the first time, the message body of the attach/TAU request message does not contain the original (old) GUTI, and the message header does not contain the GUMMEI of the old MME which allocates the old GUTI; if the terminal has been previously accessed from the 4G network, the message body of the attach/TAU request message contains the 4G-GUTI allocated by the old MME in the originally accessed 4G network as the old GUTI, and the 4G-GUTI contains the GUMMEI of the old MME allocating the 4G-GUTI, which is denoted as the first GUMMEI. In addition, the header of the attach/TAU request message includes the first GUMMEI.
In addition, in this embodiment of the application, if the terminal stores a valid 5G-GUTI, the attach/TAU request message further includes a third GUMMEI in the 4G network, which is obtained by mapping the GUAMI in the 5G-GUTI according to the mapping method shown in fig. 12.
S1404, in a case that the E-UTRAN device determines that the old MME corresponding to the first GUMMEI is not connected to the E-UTRAN device according to the first GUMMEI, the E-UTRAN device determines that the target converged network device is the converged network device in fig. 14 according to the third GUMMEI.
Specifically, after the E-UTRAN device receives the attach/TAU request message, the E-UTRAN device compares the information in the message header of the attach/TAU request message with the stored GUMMEI of each MME connected to itself, and determines whether the old access old MME of the terminal has a connection with itself. If so, selecting the old MME to be accessed again; otherwise, the E-UTRAN equipment determines the target converged network equipment according to the third GUMMEI. In this embodiment of the present application, it is exemplarily described that the old MME is not connected to the E-UTRAN device, and the mapping GUMMEI fed back by the converged network device in the step S1402 is determined by the E-UTRAN device to include the third GUMMEI, so as to determine that the target converged network device is the converged network device in fig. 14. That is to say, in this embodiment of the application, when the target convergence network device is used as an AMF network element in a 5G network, the corresponding mapping GUMMEI in the 4G network is the third GUMMEI.
S1405, the E-UTRAN device sends an attach/TAU request message to the converged network device, so that the converged network device receives the attach/TAU request message from the E-UTRAN device.
In this embodiment of the present application, when the E-UTRAN device sends the attach/TAU request message to the converged network device, the identifier of the E-UTRAN device or the identifier of the tracking area served by the E-UTRAN device may also be added to the message header of the attach/TAU request message, which may specifically refer to the existing implementation and is not described herein again. The description of the id of the E-UTRAN device and the id of the tracking area served by the E-UTRAN device may refer to the embodiment shown in fig. 8, and will not be repeated herein.
S1406, the converged network device sends an attach/TAU accept (accept) message to the E-UTRAN device, so that the E-UTRAN device receives the attach/TAU accept message from the converged network device. Wherein the attach/TAU accept message carries the newly assigned 4G-GUTI, which can be uniquely associated to a context of a terminal accessed from the 4G network.
S1407, the E-UTRAN equipment sends an attach/TAU acceptance message to the terminal so that the terminal receives the attach/TAU acceptance message from the E-UTRAN equipment.
Based on the access method provided by the embodiment of the application, the re-access of the dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The analysis of the related technical effects can refer to the related description of the access system part, and is not described in detail herein.
The actions of the E-UTRAN device in steps S1401 to S1407 may be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present invention.
Optionally, taking as AN example that the first network in the access system shown in fig. 1 is a 5G network, the second network is a 4G network, and the NG-AN device can ensure that a correct converged network device is selected for the dual registration terminal for the first time to process, as shown in fig. 15, another access method provided in the embodiment of the present application is provided, where the access method includes the following steps:
s1501, the NG-AN equipment sends AN NG setup request (NG setup request) message to the converged network equipment, so that the converged network equipment receives the NG setup request message from the NG-AN equipment.
Wherein the NG setup request message is for requesting registration to the converged network device.
S1502, the converged network device sends AN NG setup response (NG setup response) message to the NG-AN device, so that the NG-AN device receives the NG setup response message from the converged network device.
Wherein the NG setup response message carries two sets of GUAMI. The group of GUAMIs are corresponding GUAMIs when the converged network equipment is used as an AMF network element, are recorded as original GUAMIs and represent 5G network equipment; the group of GUAMI is GUAMI obtained by mapping the corresponding original GUMMEI when the converged network device is used as the MME network element, and is referred to as mapping GUAMI, which represents 4G network devices.
Optionally, in this embodiment of the application, the AMF pool and the MME pool in the network may be planned independently. For example, the original GUAMI and the original GUMMEI to which the device belongs are configured on the converged network device respectively. Or, in this embodiment of the present application, the original GUMMEI corresponding to the converged network device when serving as the MME and the original gummi corresponding to the converged network device when serving as the AMF network element may also be obtained in other manners, for example, one or more globally unique identifiers may be configured for the converged network device, and the original gummi and the original GUMMEI may be mapped by the one or more globally unique identifiers corresponding to the converged network device, which is not specifically limited in this embodiment of the present application.
The mapping GUAMI mapped by the original GUMMEI in the embodiment of the present application according to the prior art is not the same as the GUAMI of any MME in the network, nor the GUAMI mapped by the original GUMMEI of other MMEs in the network according to the prior art, and is described in a unified manner herein and is not described in detail below.
Optionally, in this embodiment of the application, different GUAMI in a group of GUAMI may belong to one AMF pool, that is, MCC, MNC, AMF region ID and AMF set ID are all the same; or may belong to multiple AMF pools, that is, one or more of MCC, MNC, AMF region ID and AMF set ID are different, and this is not particularly limited in the embodiment of the present application.
Optionally, in this embodiment of the present application, the NG establishment response message may further carry weight information corresponding to the fusion network device serving as the AMF network element, where the weight information may be determined according to the weight information of the fusion network device, for example, the weight information of the fusion network device is mapped to the weight information corresponding to the fusion network device serving as the AMF network element according to a certain ratio, and this is not specifically limited in this embodiment of the present application.
It should be noted that, in this embodiment of the present application, the weight information of the converged network device represents the processing capability of the converged network device in the converged network device pool to which the converged network device belongs, compared with other converged network devices. Generally, the greater the processing capability, the higher the weight of the converged network device, which is described in the unified manner herein and will not be described in detail below.
It should be noted that the above steps S1501 to S1502 are optional steps, and are only exemplified to illustrate that the NG-AN device interacts with one of the connected converged network devices to obtain two sets of GUAMI corresponding to the converged network device. Certainly, the NG-AN device may also be connected to other converged network devices or AMF network elements, where the above steps S1501 to S1502 may be referred to in a manner of interacting with other converged network devices to obtain two sets of GUAMI corresponding to the converged network devices; the method of interacting with the AMF network element to obtain the original GUAMI corresponding to the AMF network element may refer to the prior art, and is not described herein again. Furthermore, after the NG-AN device obtains the original GUAMI fed back by the one or more converged network devices or the AMF network elements connected to the NG-AN device, the NG-AN device may determine the following network topology relationship according to the original GUAMI fed back by the one or more converged network devices or the AMF network elements connected to the NG-AN device:
first, the number of AMF pool connected by the NG-AN device, and the MCC, MNC AMF region ID and AMF set ID corresponding to each AMF pool.
Secondly, the number of AMF network elements under each AMF pool, and the AMF pointers and communication addresses of each AMF network element.
S1503, the terminal sends a registration request (registration request) message to the NG-AN device, so that the NG-AN device receives the registration request message from the terminal.
If the terminal accesses the 5G network for the first time, the message body of the registration request message does not contain the original (old) GUTI, and the message header does not have the GUAMI of the old AMF network element for allocating the old GUTI; if the terminal has been accessed from the 5G network before, the message body of the registration request message contains the 5G-GUTI allocated by the old AMF network element in the 5G network which is accessed originally as the old GUTI, and the 5G-GUTI contains the GUAMI of the old AMF network element which allocates the 5G-GUTI and is recorded as the first GUAMI. In addition, the first GUAMI is included in a header of the registration request message.
In addition, in this embodiment of the application, if the terminal stores a valid 4G-GUTI, the registration request message also carries a third GUAMI in the 5G network, which is obtained by mapping the GUMMEI in the 4G-GUTI according to the mapping method shown in fig. 12.
S1504, when the NG-AN device determines, according to the first GUAMI, that the old AMF network element corresponding to the first GUAMI is not connected to the NG-AN device, the NG-AN device determines, according to the third GUAMI, that the target converged network device is the converged network device in fig. 15.
Specifically, after the NG-AN device receives the registration request message, the NG-AN device compares the information in the message header of the registration request message with the GUAMI of each AMF network element connected to itself, which is stored before, and determines whether the old amd AMF network element accessed by the terminal has a connection with itself. If the connection exists, selecting the old AMF network element for re-access; otherwise, the NG-AN equipment determines the target converged network equipment according to the third GUAMI. In this embodiment of the present application, it is exemplarily described that the old AMF network element is not connected to the NG-AN device, and the NG-AN device determines that the mapping GUAMI fed back by the converged network device in step S1502 includes the third GUAMI, so as to determine that the target converged network device is the converged network device in fig. 15. That is to say, in this embodiment of the application, when the target convergence network device serves as the MME in the 4G network, the corresponding mapping GUAMI in the 5G network is the third GUAMI.
S1505, the NG-AN device sends a registration request message to the converged network device, so that the converged network device receives the registration request message from the NG-AN device.
In this embodiment of the present application, when the NG-AN device sends the registration request message to the convergence network device, the identifier of the NG-AN device or the identifier of the tracking area served by the NG-AN device may also be added to the message header of the registration request message, which may specifically refer to the existing implementation manner and is not described herein again. The description of the id of the NG-AN device and the id of the tracking area served by the NG-AN device may refer to the embodiment shown in fig. 10, and will not be described herein again.
S1506, the converged network device sends a registration acceptance message to the NG-AN device, so that the NG-AN device receives the registration acceptance message from the converged network device. Wherein the registration acceptance message carries the newly allocated 5G-GUTI, and the newly allocated 5G-GUTI can be uniquely associated with the context of a terminal accessed from the 5G network.
S1507, the NG-AN device transmits a registration acceptance message to the terminal so that the terminal receives the registration acceptance message from the NG-AN device.
Based on the access method provided by the embodiment of the application, the re-access of the dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The analysis of the related technical effects can refer to the related description of the access system part, and is not described in detail herein.
The actions of the NG-AN apparatus in steps S1501 to S1507 may be executed by the processor 601 in the communication apparatus 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, for example, as shown in fig. 16, the first network in the access system shown in fig. 2 is a 4G network, the second network is a 5G network, and the selection algorithm of the E-UTRAN device for the MME is not improved, and it cannot be guaranteed that a correct converged network device is selected for the dual registration terminal to perform processing, the access method provided in the embodiment of the present application includes the following steps:
s1601a-S1602a, similar to the steps S1401-S1402 in the embodiment shown in FIG. 14, except that the converged network device in the steps S1401-S1402 is replaced with the first converged network device in the embodiment of the present application; replacing the S1 establishment request message in steps S1401-S1402 with the S1 establishment request message 1 in the embodiment of the present application; replacing the S1 establishment response message in steps S1401-S1402 with the S1 establishment request response 1 in the embodiment of the present application; the rest of the related description may refer to the embodiment shown in fig. 14, and will not be described herein again.
S1601b-S1602b, similar to the steps S1401-S1402 in the embodiment shown in FIG. 14, except that the converged network device in the steps S1401-S1402 is replaced with a second converged network device in the embodiment of the present application; replacing the S1 setup request message in steps S1401-S1402 with the S1 setup request message 2 in the embodiment of the present application; replacing the S1 establishment response message in steps S1401-S1402 with the S1 establishment request response 2 in the embodiment of the present application; the rest of the related description may refer to the embodiment shown in fig. 14, and will not be described herein again.
S1603, the terminal sends an attach/TAU request message to the E-UTRAN device, so that the E-UTRAN device receives the attach/TAU request message from the terminal.
If the terminal accesses the 4G network for the first time, the message body of the attach/TAU request message does not contain the original (old) GUTI, and the message header does not contain the GUMMEI of the old MME which allocates the old GUTI; if the terminal has been previously accessed from the 4G network, the message body of the attach/TAU request message contains the 4G-GUTI allocated by the old MME in the originally accessed 4G network as the old GUTI, and the 4G-GUTI contains the GUMMEI of the old MME allocating the 4G-GUTI, which is denoted as the first GUMMEI. In addition, the header of the attach/TAU request message includes the first GUMMEI.
In addition, if the terminal stores a valid 5G-GUTI, the attach/TAU request message also carries the 5G-GUTI.
S1604, the E-UTRAN equipment selects the first converged network equipment to provide service for the terminal.
The E-UTRAN device may select, in each converged network device connected to the E-UTRAN device, an MME pool allowed to access the E-UTRAN device through a certain algorithm according to factors such as a wireless neighboring cell, and then select, according to factors such as a weight, an appropriate converged network device from the MME pools through a certain algorithm to provide services for the terminal, which may specifically refer to a manner in which an existing E-UTRAN device selects an MME to provide services for the terminal, and will not be described herein again.
S1605, the E-UTRAN device sends an attach/TAU request message to the first converged network device, so that the first converged network device receives the attach/TAU request message from the E-UTRAN device.
Step S1405 may be referred to for implementation of step S1605, and details thereof are not repeated herein.
S1606, the first converged network device determines that the 5G-GUTI is not distributed by the first converged network device.
S1607, the first converged network device determines that the AMF pool to which the AMF network element of the 5G-GUTI is allocated is the same as the AMF pool to which the first converged network device belongs when the first converged network device is used as the AMF network element in the 5G network, and then the first converged network device determines that the second converged network device connected with the terminal through the E-UTRAN device accesses the 5G network.
Optionally, in this embodiment of the application, if the first converged network device determines that the 5G-GUTI is allocated by the first converged network device; or, if the first converged network device determines that the AMF pool to which the AMF network element of the 5G-GUTI is allocated is different from the AMF pool to which the first converged network device belongs when serving as the AMF network element in the 5G network, processing may be performed according to an attach/TAU flow of the existing terminal in the 4G network, which is not specifically limited in this embodiment of the present application.
Further, in the embodiment of the present application, the attach/TAU request message may be redirected to the second converged network device in any one of the following manners one to three.
The first method includes the following steps S1608a-S1609 a:
s1608a, the first converged network device sends a reroute request message to the E-UTRAN device so that the E-UTRAN device receives the reroute request message from the first converged network device.
Wherein the rerouting request message includes a mapping GUMMEI in the 4G network obtained by the gummi mapping in the 5G-GUTI and the attach/TAU request message.
Optionally, the rerouting request message in this embodiment of the present application may be, for example, a rerouting non-access stratum (NAS) message request (request) message, which is not specifically limited in this embodiment of the present application.
S1609a, the E-UTRAN device sends an attach/TAU request message to the second converged network device corresponding to the mapping GUMMEI according to the mapping GUMMEI in the rerouting request message, so that the second converged network device receives the attach/TAU request message from the E-UTRAN device.
Alternatively, the second method includes the following steps S1608b-S1610 b:
s1608b, the first converged network device sends a DNS query request (DNS query request) message to a Domain Name System (DNS) server, so that the DNS server receives the DNS query request message from the first converged network device. The DNS query request message carries a mapping GUMMEI in the 4G network obtained by the GUAMI mapping in the 5G-GUTI, and is used to query address information of the second converged network device.
Optionally, in this embodiment of the application, the first converged network device may construct an MME full domain name (FQDN) according to the mapping GUMMEI in the 4G network obtained by mapping the GUAMI in the 5G-GUTI, and carry the MME FQDN in the DNS query request message to query the address information of the second converged network device. The MMEFQDN has the following format and comprises mapping GUMMEI information:
mmec<MMEC>.mmegi<MMEGI>.mme.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org；
inquiring parameters: "x-3gpp-mme: x-s 10".
S1609b, the DNS server sends a DNS query response (DNS query response) message to the first converged network device, so that the first converged network device receives the DNS query response message from the DNS server. And the DNS inquiry response message carries the address information of the second converged network device.
S1610b, the first converged network device sends an MME reroute NAS message request (MME reroute NAS message request) message to the second converged network device according to the address information of the second converged network device, so that the second converged network device receives the MME reroute NAS message request message from the first converged network device. Wherein, the MME reroutes the NAS message request message to carry the attach/TAU request message.
Or, the third method includes the following steps S1608c-S1610 c:
s1608c, the first converged network device sends a discovery request (discovery request) message to a network discovery function (NRF) network element, so that the NRF network element receives the discovery request message from the first converged network device.
Wherein, the discovery request message carries the GUAMI in the 5G-GUTI, and is used for querying the address information of the second converged network device.
S1609c, the NRF network element sends a discovery response (discovery response) message to the first converged network device, so that the first converged network device receives the discovery response message from the NRF network element. Wherein the discovery response message carries address information of the second converged network device.
S1610c, the first converged network device sends an N1message notification (N1message notification) to the second converged network device according to the address information of the second converged network device, so that the second converged network device receives the N1message notification from the first converged network device. Wherein, the N1message notification carries the attach/TAU request message.
Further, after the attach/TAU request message is redirected to the second converged network device, the access method provided in the embodiment of the present application further includes the following steps S1611 to S1612:
s1611, the second converged network device sends an attach/TAU accept message to the E-UTRAN device, so that the E-UTRAN device receives the attach/TAU accept message from the second converged network device. Wherein the attach/TAU accept message carries the newly assigned 4G-GUTI, which can be uniquely associated to a context of a terminal accessed from the 4G network.
S1612, the E-UTRAN device sends an attach/TAU accept message to the terminal, so that the terminal receives the attach/TAU accept message from the E-UTRAN device.
Based on the access method provided by the embodiment of the application, the re-access of the dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The analysis of the related technical effects can refer to the related description of the access system part, and is not described in detail herein.
The actions of the first converged network device in the above steps S1601a to S1612 can be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, for example, as shown in fig. 17, the first network in the access system shown in fig. 2 is a 5G network, the second network is a 4G network, and the NG-AN device does not improve a selection algorithm of the AMF network element and cannot ensure that a correct converged network device is selected for the dual registration terminal to perform processing, the access method provided in the embodiment of the present application includes the following steps:
s1701a-S1702a are similar to steps S1501-S1502 in the embodiment shown in fig. 15, except that, for example, the converged network device in steps S1501-S1502 is replaced with the first converged network device in the embodiment of the present application; replacing NG establishment request messages in the steps S1501-S1502 with NG establishment request message 1 in the embodiment of the application; replacing NG establishment response messages in the steps S1501-S1502 with NG establishment request responses 1 in the embodiment of the application; the rest of the related description may refer to the embodiment shown in fig. 15, and will not be described herein again.
S1701b-S1702b are similar to steps S1501-S1502 in the embodiment shown in fig. 15, except that, for example, the converged network device in steps S1501-S1502 is replaced with a second converged network device in the embodiment of the present application; replacing the NG establishment request message in the steps S1501-S1502 with an NG establishment request message 2 in the embodiment of the application; replacing NG establishment response messages in the steps S1501-S1502 with NG establishment request responses 2 in the embodiment of the application; the rest of the related description may refer to the embodiment shown in fig. 15, and will not be described herein again.
S1703, the terminal sends a registration request message to the NG-AN device, so that the NG-AN device receives the registration request message from the terminal.
If the terminal accesses the 5G network for the first time, the message body of the registration request message does not contain the original (old) GUTI, and the message header does not have the GUAMI of the old AMF network element for allocating the old GUTI; if the terminal has been accessed from the 5G network before, the message body of the registration request message contains the 5G-GUTI allocated by the old AMF network element in the 5G network that was accessed originally as the old GUTI, and the 5G-GUTI contains the GUAMI of the old AMF network element that allocated the 5G-GUTI and is recorded as the first GUAMI. In addition, the first GUAMI is included in a header of the registration request message.
In addition, if the terminal stores the valid 4G-GUTI, the registration request message also carries the 4G-GUTI.
S1704, the NG-AN device selects the first converged network device to provide service for the terminal.
The NG-AN device may select, in each converged network device connected to the NG-AN device, AN AMF pool allowed to be accessed by a certain algorithm according to factors such as a wireless neighboring cell, and then select, according to factors such as a weight, AN appropriate converged network device from the AMF pool by a certain algorithm to provide services for the terminal, and specifically refer to a mode in which AN existing NG-AN device selects AN AMF network element to provide services for the terminal, which is not described herein again.
S1705, the NG-AN device sends a registration request message to the first converged network device, so that the first converged network device receives the registration request message from the NG-AN device.
Step S1505 can be referred to for implementation of step S1705, and details are not repeated herein.
S1706, the first converged network device determines that the 4G-GUTI is not allocated by the first converged network device.
S1707, if the first converged network device determines that the MME pool to which the MME of the 4G-GUTI belongs is the same as the MME pool to which the first converged network device belongs when the first converged network device is used as the MME in the 4G network, the first converged network device determines that the terminal accesses the 4G network through the second converged network device connected by the NG-AN device.
Optionally, in this embodiment of the application, if the first converged network device determines that the 4G-GUTI in the registration request message is allocated by the first converged network device; or, if the first converged network device determines that the MME pool to which the MME allocating the 4G-GUTI belongs is different from the MME pool to which the first converged network device belongs when serving as the MME in the 4G network, processing may be performed according to a registration flow of the existing terminal in the 5G network, which is not specifically limited in this embodiment of the present application.
Further, in the embodiment of the present application, the registration request message may be redirected to the second converged network device in any one of the following manners one to three.
The method I comprises the following steps S1708a-S1709 a:
s1708a, the first converged network device sends a reroute request message to the NG-AN device so that the NG-AN device receives the reroute request message from the first converged network device.
Wherein, the rerouting request message includes a mapping GUAMI in the 5G network obtained by mapping the GUMMEI in the 4G-GUTI and the registration request message.
Optionally, the rerouting request message in this embodiment of the present application may be, for example, a rerouting non-access stratum NAS message request message, which is not specifically limited in this embodiment of the present application.
S1709a, the NG-AN device sends a registration request message to a second converged network device corresponding to the mapping GUAMI according to the mapping GUAMI in the rerouting request message, so that the second converged network device receives the registration request message from the NG-AN device.
Or, the second method includes the following steps S1708b-S1710 b:
s1708b, the first converged network device sends the discovery request message to the NRF network element, so that the NRF network element receives the discovery request message from the first converged network device.
The discovery request message carries mapping GUAMI in the 5G network obtained by mapping GUMMEI in the 4G-GUTI, and is used for inquiring address information of the second converged network device.
S1709b, the NRF network element sends a discovery response message to the first converged network device, so that the first converged network device receives the discovery response message from the NRF network element. Wherein the discovery response message carries address information of the second converged network device.
S1710b, the first converged network device sends an N1message notification to the second converged network device according to the address information of the second converged network device, so that the second converged network device receives the N1message notification from the first converged network device. Wherein, the N1message notification carries the registration request message.
Or, the third method includes the following steps S1708c-S1710 c:
s1708c, the first converged network device sends a DNS query request message to the DNS server, so that the DNS server receives the DNS query request message from the first converged network device. The DNS query request message carries a GUMMEI in the 4G-GUTI and is used for querying address information of the second converged network device.
Optionally, in this embodiment of the application, the first converged network device may construct an MME FQDN according to the GUMMEI in the 4G-GUTI, and carry the MME FQDN in the DNS query request message to query the address information of the second converged network device. The format of MME FQDN is as follows, and mapping GUMMEI information is contained:
mmec<MMEC>.mmegi<MMEGI>.mme.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org；
inquiring parameters: "x-3gpp-mme: x-s 10".
S1709c, the DNS server sends a DNS query response message to the first converged network device, so that the first converged network device receives the DNS query response message from the DNS server. And the DNS inquiry response message carries the address information of the second converged network device.
S1710c, the first converged network device sends the MME rerouting NAS message request message to the second converged network device according to the address information of the second converged network device, so that the second converged network device receives the MME rerouting NAS message request message from the first converged network device. And the MME reroutes the NAS message request message to carry the registration request message.
Further, after redirecting the registration request message to the second converged network device, the access method provided in the embodiment of the present application further includes the following steps S1711 to S1712:
s1711, the second converged network device sends a registration acceptance message to the NG-AN device, so that the NG-AN device receives the registration acceptance message from the second converged network device. Wherein the registration acceptance message carries the newly allocated 5G-GUTI, and the newly allocated 5G-GUTI can be uniquely associated with the context of a terminal accessed from the 5G network.
S1712, the NG-AN equipment sends a registration acceptance message to the terminal so that the terminal receives the registration acceptance message from the NG-AN equipment.
Based on the access method provided by the embodiment of the application, the re-access of the dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The analysis of the related technical effects can refer to the related description of the access system part, and is not described in detail herein.
The actions of the first converged network device in steps S1701a to S1712 may be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, for example, as shown in fig. 18, the first network in the access system shown in fig. 2 is a 4G network, the second network is a 5G network, and the selection algorithm of the E-UTRAN device for the MME is not improved, and it cannot be guaranteed that a correct converged network device is selected for the dual registration terminal to perform processing, the access method provided in the embodiment of the present application includes the following steps:
s1801a-S1806, similar to steps S1601a-S1606 in the embodiment shown in FIG. 16, the related description may refer to the embodiment shown in FIG. 16, and will not be repeated herein.
S1807, the first converged network device obtains address information of a target AMF network element for allocating 5G-GUTI to the terminal and address information of a candidate MME capable of providing service for the E-UTRAN device.
Optionally, in this embodiment of the application, the first converged network device may obtain the address information of the target AMF network element that allocates the 5G-GUTI to the terminal in a manner that the first converged network device obtains the address information of the second converged network device in the embodiment shown in fig. 16, which may specifically refer to the embodiment shown in fig. 16 and is not described herein again.
Optionally, in this embodiment of the present application, the first converged network device may obtain address information of a candidate MME capable of providing a service for the E-UTRAN device according to the identifier of the E-UTRAN device or the identifier of the tracking area served by the E-UTRAN device.
For example, the first converged network device may construct the FQDN according to the identifier of the E-UTRAN device or the identifier of the tracking area served by the E-UTRAN device, and further send the DNS query request message to the DNS server, so that the DNS server receives the DNS query request message from the first converged network device. The DNS query request message carries the FQDN and is used to request query of address information of the candidate MME. The DNS server sends a DNS query response message to the first converged network device, so that the first converged network device receives the DNS query response message from the DNS server, wherein the DNS query response message carries the identification list and the address information of the candidate MME.
The first converged network device may construct the FQDN in several ways:
in a first mode, the converged network device may construct FQDN6 according to the identifier of the E-UTRAN device, where the FQDN6 includes the identifier of the E-UTRAN device, and the format is as follows:
enb<eNodeB-ID>.enb.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org；
inquiring parameters: "x-3gpp-mme: x-s 10".
In a second mode, the converged network device may construct FQDN7 according to the identifier of the tracking area served by the E-UTRAN device, where the FQDN7 includes the identifier of the tracking area served by the E-UTRAN device, and the format is as follows:
tac-lb<TAC-low-byte>.tac-hb<TAC-high-byte>.tac.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org；
inquiring parameters: "x-3gpp-mme: x-s 10".
The embodiment of the present application does not specifically limit the construction manner of the FQDN in the DNS query request message.
S1808, the first converged network device determines that the address information of the target AMF network element is in the address information of the candidate MME, and then the first converged network device determines that the second converged network device to which the terminal has been connected through the E-UTRAN device accesses the 5G network.
At this time, correspondingly, the first converged network device may determine the address information of the target AMF network element as the address information of the second converged network device.
Further, in the embodiment of the present application, the attach/TAU request message may be redirected to the second converged network device in any one of the following manners one to three.
The method I comprises the following steps S1809a-S1810 a:
s1809a-S1810a are similar to the steps S1608a-S1609a in the embodiment shown in FIG. 16, and the related description may refer to the embodiment shown in FIG. 16, which is not repeated herein.
Alternatively, the second method includes the following step S1809 b:
s1809b, similar to step S1610b in the embodiment shown in fig. 16, the related description may refer to the embodiment shown in fig. 16, and will not be repeated here.
Alternatively, the third method includes the following step S1809 c:
s1809c, similar to step S1610c in the embodiment shown in fig. 16, the related description may refer to the embodiment shown in fig. 16, and will not be repeated here.
Further, after the attach/TAU request message is redirected to the second converged network device, the access method provided in the embodiment of the present application further includes the following steps S1811-S1812:
s1811 to S1812, similar to steps S1611 to S1612 in the embodiment shown in fig. 16, for related description, refer to the embodiment shown in fig. 16, and are not repeated herein.
Based on the access method provided by the embodiment of the application, the re-access of the dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The analysis of the related technical effects can refer to the related description of the access system part, and is not described in detail herein.
The actions of the first converged network device in steps S1801a to S1812 may be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, for example, as shown in fig. 19, the first network in the access system shown in fig. 2 is a 5G network, the second network is a 4G network, and the NG-AN device does not improve a selection algorithm of the AMF network element and cannot ensure that a correct converged network device is selected for the dual registration terminal to process, the access method provided in the embodiment of the present application includes the following steps:
s1901a-S1906, similar to steps S1701a-S1706 in the embodiment shown in FIG. 17, the related description can refer to the embodiment shown in FIG. 17, and will not be repeated herein.
S1907, the first converged network device obtains address information of a target MME which allocates 4G-GUTI for the terminal, and address information of candidate AMF network elements which can provide service for NG-AN devices.
Optionally, in this embodiment of the application, the first converged network device may obtain the address information of the target MME that allocates the 4G-GUTI to the terminal in a manner that the first converged network device obtains the address information of the second converged network device in the embodiment shown in fig. 17, which may specifically refer to the embodiment shown in fig. 17 and is not described herein again.
Optionally, in this embodiment of the present application, the first converged network device may obtain address information of candidate AMF network elements capable of providing services for the NG-AN device according to the identifier of the NG-AN device or the identifier of the tracking area served by the NG-AN device.
For example, the first converged network device may construct the FQDN from the identity of the NG-AN device or the identity of the tracking area served by the NG-AN device, and then send a DNS query request message to the DNS server, so that the DNS server receives the DNS query request message from the first converged network device. The DNS query request message carries the FQDN, and is used to request query of address information of the candidate AMF network element. The DNS server sends a DNS query response message to the first converged network device, so that the first converged network device receives the DNS query response message from the DNS server, and the DNS query response message carries the identification list and the address information of the candidate AMF network elements.
The first converged network device may construct the FQDN in several ways:
in a first way, the first converged network device may construct FQDN1 according to the identifier of the NG-AN device, where the FQDN1 includes the identifier of the NG-AN device, and the format may be AN FQDN format corresponding to the identifier of the NG-AN device in the 5G network, as follows:
ranode < AN equipment ID >. ranode.5 g.mnc < MNC >. MCC < MCC >.3 gppnetwork.org;
inquiring parameters: "x-3gpp-amf: x-n 26".
In a second way, the first converged network device may construct FQDN2 according to the identifier of the tracking area served by the NG-AN device, where the FQDN2 includes the identifier of the tracking area served by the NG-AN device, and the format may be AN FQDN format corresponding to the identifier of the tracking area served by the NG-AN device in the 5G network, as follows:
tac-lb<TAC-low-byte>.tac-mb<TAC-middle-byte>.tac-hb<TAC-high-byte>.tac.5g.mnc<MNC>.mcc<MCC>.3gppnetwork.org；
inquiring parameters: "x-3gpp-amf: x-n 26".
Third, the first converged network device may construct FQDN3 according to the id of the NG-AN device, where the FQDN3 includes the id of the NG-AN device, and the format may be AN FQDN format corresponding to the id of the E-UTRAN device in the 4G network, as follows:
enb<eNodeB-ID>.enb.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org；
inquiring parameters: "x-3gpp-mme: x-s 10".
Wherein the "eNodeB-ID" is populated with the AN device ID in the global AN device ID.
In a fourth way, the first converged network device may construct FQDN4 according to the identifier of the tracking area served by the NG-AN device, where the FQDN4 includes the identifier of the tracking area served by the NG-AN device, and the format may be AN FQDN format corresponding to the identifier of the tracking area served by the E-UTRAN device in the 4G network, as follows:
tac-lb<TAC-low-byte>.tac-hb<TAC-high-byte>.tac.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org；
inquiring parameters: "x-3gpp-mme: x-s 10".
Wherein "TAC-low-byte" is filled with the lower 1 byte of the TAC field of the 5G-TAI; wherein "TAC-high-byte" is padded with the high 2 bytes of the TAC field of the 5G-TAI.
Fifth, the first converged network device may construct FQDN5 according to the identifier of the tracking area served by the NG-AN device, where the FQDN5 includes MCC and MNC in the identifier of the tracking area served by the NG-AN device and the lower 16 bits (i.e. lower 2 bytes) in the TAC, and may be in the format of FQDN format corresponding to the identifier of the tracking area served by the E-UTRAN device in the 4G network, as follows:
tac-lb<TAC-low-byte>.tac-hb<TAC-high-byte>.tac.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org；
inquiring parameters: "x-3gpp-mme: x-s 10".
Wherein "TAC-low-byte" is filled with the lowest byte of the TAC field of the 5G-TAI; wherein the 'TAC-high-byte' is filled with the middle byte of the TAC field of the 5G-TAI; the highest byte of the TAC field of the 5G-TAI is directly discarded.
The embodiment of the present application does not specifically limit the construction manner of the FQDN in the DNS query request message.
Alternatively, for example, the first converged network device may send a discovery request message to the NRF network element, so that the NRF network element receives the discovery request message from the converged network device. The discovery request message carries the identification of the NG-AN equipment or the identification of the tracking area served by the NG-AN equipment and is used for requesting to inquire the address information of the candidate AMF network element. The NRF network element sends a discovery response message to the converged network device, so that the converged network device receives the discovery response message from the NRF network element, wherein the discovery response message carries address information of a group of candidate AMF network elements.
S1908, the first converged network device determines that the address information of the target MME is in the address information of the candidate AMF network element, and then the first converged network device determines that the second converged network device to which the terminal has been connected through the NG-AN device accesses the 4G network.
At this time, correspondingly, the first converged network device may determine the address information of the target MME as the address information of the second converged network device.
Further, in the embodiment of the present application, the attach/TAU request message may be redirected to the second converged network device in any one of the following manners one to three.
The method I comprises the following steps S1909a-S1910 a:
s1909a-S1910a are similar to steps S1708a-S1709a in the embodiment shown in FIG. 17, and the related description may refer to the embodiment shown in FIG. 17, which is not repeated herein.
Alternatively, the second method includes the following step S1909 b:
s1909b, similar to step S1710b in the embodiment shown in fig. 17, for related description, reference may be made to the embodiment shown in fig. 17, which is not repeated herein.
Alternatively, the third method includes the following step S1909 c:
s1909c, similar to step S1710c in the embodiment shown in fig. 17, for related description, reference may be made to the embodiment shown in fig. 17, which is not repeated herein.
Further, after the attach/TAU request message is redirected to the second converged network device, the access method provided in the embodiment of the present application further includes the following steps S1911 to S1912:
S1911-S1912, similar to steps S1711-S1712 in the embodiment shown in fig. 17, for the related description, reference may be made to the embodiment shown in fig. 17, which is not repeated herein.
Based on the access method provided by the embodiment of the application, the re-access of the dual-registration terminal can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The analysis of the related technical effects can refer to the related description of the access system part, and is not described in detail herein.
The actions of the first converged network device in steps S1901a to S1912 may be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, taking as an example that the first network in the handover system shown in fig. 3 is a 4G network, the second network is a 5G network, and the source MME can ensure that a correct converged network device is selected for the dual registration terminal for the first time to process, as shown in fig. 20, a handover method provided in the embodiment of the present application includes the following steps:
s2001, the terminal sends the information of the terminal to the source E-UTRAN device, so that the source E-UTRAN device receives the information of the terminal from the terminal.
Wherein the information of the terminal comprises a 5G-GUTI of the terminal in the 5G network.
S2002, the source E-UTRAN equipment sends a handover required to the source MME so that the source MME receives the handover required from the source E-UTRAN equipment.
The handover requirement carries the 5G-GUTI of the terminal in the 5G network, and the identifier of the target E-UTRAN equipment or the identifier of the tracking area served by the target E-UTRAN equipment. The description of the identifier of the target E-UTRAN device or the identifier of the tracking area served by the target E-UTRAN device may refer to the embodiment shown in fig. 8, and will not be described herein again.
S2003, the source MME determines that the target E-UTRAN equipment does not belong to the jurisdiction of the source MME according to the identification of the target E-UTRAN equipment or the identification of the tracking area served by the target E-UTRAN equipment.
In this embodiment, whether the target E-UTRAN device belongs to the source MME may be understood as whether the target E-UTRAN device has established a connection with the source MME, which is described herein in a unified manner and is not described in detail below.
Optionally, the source MME may match the identifier of the target E-UTRAN device carried in the handover requirement with the identifier of the E-UTRAN device reported by each E-UTRAN device connected to the source MME in the E-UTRAN device registration procedure, and if the matching is successful, for example, the identifier of the target E-UTRAN device carried in the handover requirement is included in the identifiers of the E-UTRAN devices reported by each E-UTRAN device connected to the source MME in the E-UTRAN device registration procedure, it may be determined that the target E-UTRAN device belongs to the source MME jurisdiction.
Or, optionally, the source MME may match the identifier of the tracking area served by the target E-UTRAN device carried in the handover requirement with the identifier of the tracking area served by the E-UTRAN device reported by each E-UTRAN device connected to the source MME in the E-UTRAN device registration procedure, and if the matching is successful, for example, the identifier of the tracking area served by the target E-UTRAN device carried in the handover requirement is included in the identifier of the tracking area served by the E-UTRAN device reported by each E-UTRAN device connected to the source MME in the E-UTRAN device registration procedure, it may be determined that the target E-UTRAN device belongs to the jurisdiction of the source MME.
Otherwise, the source MME may determine that the target E-UTRAN device does not belong in the source MME jurisdiction.
Optionally, in this embodiment of the present application, if the source MME determines that the target E-UTRAN device belongs to the jurisdiction of the source MME according to the identifier of the target E-UTRAN device or the identifier of the tracking area served by the target E-UTRAN device, processing may be performed with reference to a handover procedure of an existing 4G network, which is not specifically limited in this embodiment of the present application.
S2004, the source MME acquires the identification list and the address information of the candidate MME according to the identification of the target E-UTRAN equipment or the identification of the tracking area served by the target E-UTRAN equipment.
For specific implementation of step S2004, reference may be made to a manner in which the first converged network device acquires the identifier list and the address information of the candidate MME from the DNS server in the embodiment shown in fig. 18, which is not described herein again.
The identifier list of the candidate MME in the embodiment of the present application may include a GUMMEI of the MME, or an original GUMMEI corresponding to the converged network device serving as the MME, and a mapping GUMMEI corresponding to the converged network device serving as the AMF network element, and the like, which is not specifically limited in the present application.
S2005, the source MME determines the target converged network device according to the 5G-GUTI and the identification list of the candidate MME.
Optionally, in this embodiment of the application, the source MME may determine, in the identifier list of the candidate MME, a converged network device corresponding to a mapping GUMMEI that is the same as a mapping GUMMEI obtained by mapping a gummi in a 5G-gummi in a 4G network, as the target converged network device.
S2006, the source MME sends a forward redirection request (forward redirection request) message to the target converged network device according to the address information of the target converged network device included in the address information of the candidate MME, so that the target converged network device receives the forward redirection request message from the source MME.
The forwarded redirection request message carries a 4G context of the terminal, and is used for requesting the target convergence network device to prepare a relevant resource for the terminal.
S2007, the target converged network device sends a handover request (handover request) to the target E-UTRAN device, so that the target E-UTRAN device receives the handover request from the converged network device. Wherein the handover request is for requesting the target E-UTRAN device to prepare the relevant resources for the terminal.
S2008, the target E-UTRAN device sends a handover request acknowledgement (handover request acknowledge) to the target converged network device, so that the target converged network device receives the handover request acknowledgement from the target E-UTRAN device.
S2009, the target converged network device sends a forward redirection response (forward redirection response) message to the source MME, so that the source MME receives the forward redirection response message from the target converged network device.
2010. The source MME sends a handover command to the source E-UTRAN device so that the source E-UTRAN device receives the handover command from the source MME. Wherein the handover command is used for instructing the terminal to be handed over to the target E-UTRAN equipment.
S2011, the source E-UTRAN device sends a handover command to the terminal, so that the terminal receives the handover command from the source E-UTRAN device.
S2012, after the terminal is handed over to the target E-UTRAN device, a handover confirm (handover confirm) message is sent to the target E-UTRAN device, so that the target E-UTRAN device receives the handover confirm message from the terminal.
Wherein the handover confirm message is used to indicate that the terminal has been handed over to the target E-UTRAN device.
S2013, the target E-UTRAN equipment sends a handover notification (handover notification) to the target converged network equipment, so that the target converged network equipment receives the handover notification from the target E-UTRAN equipment. Wherein the handover notification is used to indicate that the terminal has handed over to the target E-UTRAN device.
S2014, the target converged network device sends a forwarding redirection completion notification (forwarded redirection completion notification) to the source MME, so that the source MME receives the forwarding redirection completion notification from the target converged network device. Wherein, the forwarding redirection completion notification is used for indicating that it can release the resources related to the terminal.
S2015, the source MME sends a forwarding redirection completion acknowledgement (forward redirection completion acknowledgement) to the target converged network device, so that the target converged network device receives the forwarding redirection completion acknowledgement from the source MME.
S2016, optionally, the source MME sends a release command (release command) to the source E-UTRAN device, so that the source E-UTRAN device receives the release command from the source MME. Wherein, the release order is used for indicating to release the resources related to the terminal.
Furthermore, the source E-UTRAN device may release the resources related to the terminal according to the release command, which is not specifically limited in this embodiment of the present application.
Based on the switching method provided by the embodiment of the application, the successful switching of the double registration terminals can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The related technical effect analysis can refer to the related description of the switching system part, and is not described in detail herein.
The source MME in steps S2001 to S2016 may be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, taking as an example that the first network in the handover system shown in fig. 3 is a 5G network, the second network is a 4G network, and the source AMF network element can ensure that a correct converged network device is selected for the dual registration terminal for the first time to process, as shown in fig. 21, a handover method provided in the embodiment of the present application includes the following steps:
s2101, the terminal transmits the information of the terminal to the source NG-AN apparatus so that the source NG-AN apparatus receives the information of the terminal from the terminal.
Wherein the information of the terminal comprises the 4G-GUTI of the terminal in the 4G network.
S2102, the source NG-AN device sends a handover requirement to the source AMF network element, so that the source AMF network element receives the handover requirement from the source NG-AN device.
The switching requirement carries the 4G-GUTI of the terminal in the 4G network, and the identification of the target NG-AN equipment or the identification of the tracking area served by the target NG-AN equipment. The description of the identification of the target NG-AN device or the identification of the tracking area served by the target NG-AN device may refer to the embodiment shown in fig. 10, and will not be described herein again.
S2103, similar to step S2003 in fig. 20, differs in that: replacing the source MME in step S2003 with the source AMF network element in the embodiment of the present application; the target E-UTRAN device in step S2003 is replaced with the target NG-AN device in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 20, which is not described herein again.
S2104, the source AMF network element obtains AN identification list and address information of the candidate AMF network element according to the identification of the target NG-AN equipment or the identification of the tracking area served by the target NG-AN equipment.
The specific implementation of step S2104 may refer to a manner in which the first converged network device obtains the identifier list and the address information of the candidate AMF network element from the NRF network element in the embodiment shown in fig. 19, which is not described herein again.
The identifier list of the candidate AMF network element in the embodiment of the present application may include a GUAMI of the AMF network element, or an original GUAMI corresponding to the fusion network device serving as the AMF network element, and a mapping GUAMI corresponding to the fusion network device serving as the MME, and the like, which is not specifically limited in the present application.
S2105, the source AMF network element determines the target fusion network equipment according to the 4G-GUTI and the identification list of the candidate AMF network elements.
Optionally, in this embodiment of the application, the source AMF network element may determine, as the target converged network device, a converged network device corresponding to a mapping GUAMI that is the same as a mapping GUAMI obtained by mapping, in the 5G network, the GUMMEI in the 4G-GUTI in the identifier list of the candidate AMF network element.
S2106, the source AMF network element sends a create context request (create context request) message to the target fusion network device according to the address information of the target fusion network device included in the address information of the candidate AMF network element, so that the target fusion network device receives the create context request message from the source AMF network element.
The create context request message carries the 5G context of the terminal, and is used to request the target convergence network device to prepare the relevant resources for the terminal.
S2107-S2108, similar to steps S2007-S2008 in fig. 20, differ, for example, in that: the target E-UTRAN device in steps S2007-S2008 is replaced with the target NG-AN device in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 20, which is not described herein again.
S2109, the target converged network device sends a create context response (create context response) message to the source AMF network element, so that the source AMF network element receives the create context response message from the target converged network device.
S2110-S2113, similar to steps S2010-S2013 in fig. 20, differ by: replacing the target E-UTRAN equipment in the step S2010-S2013 with the target NG-AN equipment in the embodiment of the application; replacing the source E-UTRAN equipment in the step S2010-S2013 with the source NG-AN equipment in the embodiment of the application; the source MME in steps S2010-S2013 is replaced by the source AMF network element in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 20, which is not described again here.
S2114, the target converged network device sends an N2 information notification (N2 Info notify) message to the source AMF network element, so that the source AMF network element receives the N2 information notification from the target converged network device. Wherein the N2 information notification is used to indicate that it can release terminal-related resources.
S2115, the source AMF network element sends an N2 information notification acknowledgement (N2 Info notify acknowledgement) to the target converged network device, so that the target converged network device receives the N2 information notification acknowledgement from the source AMF network element.
S2116, optionally, the source AMF network element sends a release order to the source NG-AN device, so that the source NG-AN device receives the release order from the source AMF network element. Wherein, the release order is used for indicating to release the resources related to the terminal.
Furthermore, the source NG-AN device may release the resource related to the terminal according to the release command, which is not specifically limited in this embodiment of the present application.
Based on the switching method provided by the embodiment of the application, the successful switching of the double registration terminals can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The related technical effect analysis can refer to the related description of the switching system part, and is not described in detail herein.
The actions of the source MME in steps S2101 to S2116 may be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, for example, as shown in fig. 22, a first network in the handover system shown in fig. 4 is a 4G network, a second network is a 5G network, and a source MME does not improve a selection algorithm of a target MME, and cannot ensure that a correct converged network device is selected for a dual registration terminal to perform processing, the handover method provided in the embodiment of the present application includes the following steps:
S2201-S2204, similar to the steps S2001-S2004 in the embodiment shown in FIG. 20, the related description can refer to the embodiment shown in FIG. 20, and will not be repeated herein.
S2205, the source MME selects the first converged network device to provide service for the terminal according to the identification list of the candidate MME.
S2206, the source MME sends a forward redirection request message to the first converged network device according to the address information of the first converged network device, so that the target converged network device receives the forward redirection request message from the source MME.
Wherein, the message of the request for forwarding redirection carries the 5G-GUTI and the address information of the source MME.
S2207-S2208, similar to steps S1606-S1607 in the embodiment shown in fig. 16, for related description, reference may be made to the embodiment shown in fig. 16, and details are not repeated here.
Optionally, in this embodiment of the application, if the first converged network device determines that the 5G-GUTI is allocated by the first converged network device; or, if the first converged network device determines that the AMF pool to which the AMF network element of the 5G-GUTI is allocated is different from the AMF pool to which the first converged network device belongs when serving as the AMF network element in the 5G network, processing may be performed according to a handover procedure of the existing terminal in the 4G network, which is not specifically limited in this embodiment of the present application.
Further, in the embodiment of the present application, the forwarding redirection request message may be redirected to the second converged network device in any one of the following manners one to three.
The first method comprises the following steps S2209a-S2211 a:
s2209a-S2211a are similar to the steps S1608b-S1610b, except that: the MME rerouting NAS message request message carrying attach/TAU request message in steps S1608b-S1610b is replaced with the MME rerouting forwarding redirection request (MME forwarding redirection request) message carrying forwarding redirection request message in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 16, which is not described herein again.
Or, the second method comprises the following steps S2209b-S2212 b:
s2209b-S2210b are the same as the above steps S2209a-S2210a, and are not described herein again.
S2211b, the first converged network device sends a forward redirection response message to the source MME, so that the source MME receives the forward redirection response message from the first converged network device.
The forwarding redirection response message carries indication information and address information of the second converged network device, and the indication information is used for indicating the source MME to send the forwarding redirection request message to the second converged network device.
S2212b, the source MME sends the forward redirection request message to the second converged network device according to the address information of the second converged network device, so that the second converged network device receives the forward redirection request message from the source MME.
Or, the third method includes the following steps S2209c-S2211 c:
s2209c-S2211c are similar to the steps S1608c-S1610c, except that: the N1message notification carrying attach/TAU request message in steps S1608c-S1610c is replaced with a forward redirection request message notification (forward redirection request message notification) carrying forward redirection request message in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 16, which is not described herein again.
Further, after redirecting the forwarding redirection request message to the second converged network device, the access method provided in the embodiment of the present application further includes the following steps:
S2213-S2222 are similar to steps S2007-S2016 in the embodiment shown in FIG. 20, with the following differences: the target converged network device in steps S2007-S2016 is replaced with the second converged network device in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 20, which is not described herein again.
Based on the switching method provided by the embodiment of the application, the successful switching of the double registration terminals can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The related technical effect analysis can refer to the related description of the switching system part, and is not described in detail herein.
The actions of the first converged network device in steps S2201 to S2222 may be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, for example, as shown in fig. 23, the first network in the handover system shown in fig. 4 is a 5G network, the second network is a 4G network, and the selection algorithm of the source AMF network element on the target AMF network element is not improved, and it cannot be guaranteed that a correct converged network device is selected for the dual registration terminal to perform processing, the handover method provided in the embodiment of the present application includes the following steps:
s2301 to S2304, and steps S2101 to S2104 in the embodiment shown in fig. 21, for the related description, reference may be made to the embodiment shown in fig. 21, and details are not repeated here.
S2305, the source AMF network element selects the first converged network device to provide service for the terminal according to the identifier list of the candidate AMF network element.
S2306, the source AMF network element sends a request message for creating a context to the first converged network device according to the address information of the first converged network device, so that the target converged network device receives the request message for creating a context from the source AMF network element.
Wherein, the context creating request message carries the 5G-GUTI and the address information of the source AMF network element.
S2307 to S2308 are similar to steps S1706 to S1707 in the embodiment shown in fig. 17, for example, a difference is that the NG-AN device in the embodiment shown in fig. 7 is replaced by a target NG-AN device in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 16, and will not be described again here.
Optionally, in this embodiment of the application, if the first converged network device determines that the 4G-GUTI in the registration request message is allocated by the first converged network device; or, if the first converged network device determines that the MME pool to which the MME allocating the 4G-GUTI belongs is different from the MME pool to which the first converged network device belongs when serving as the MME in the 4G network, processing may be performed according to a handover procedure of the existing terminal in the 5G network, which is not specifically limited in this embodiment of the present application.
Further, in the embodiment of the present application, the create context request message may be redirected to the second converged network device in any one of the following manners one to three.
The first method includes the following steps S2309a-S2311 a:
s2309a-S2311a are similar to the steps S1708b-S1710b, and the differences are: the N1message notification carrying registration request message in steps S1708b-S1710b is replaced by the forwarding redirection request message notification carrying creation context request message in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 16, which is not described herein again.
Or, the second method includes the following steps S2309b-S3212 b:
s2309b-S2310b are the same as the above steps S2309a-S2310a, and are not repeated herein.
S2311b, the first converged network device sends a create context response message to the source AMF network element, so that the source AMF network element receives the create context response message from the first converged network device.
The creating context response message carries indication information and address information of the second converged network device, and the indication information is used for indicating the source AMF network element to send the creating context request message to the second converged network device.
S2312b, the source AMF network element sends the create context request message to the second converged network device according to the address information of the second converged network device, so that the second converged network device receives the create context request message from the source AMF network element.
Or, the third method includes the following steps S2309c-S2311 c:
s2309c-S2311c are similar to the steps S1708c-S1710c, and the differences are: the MME rerouting NAS message request carrying registration request message in steps S1708c-S1710c is replaced with the MME rerouting forwarding redirection request message carrying create context request message in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 17, which is not described herein again.
Further, after redirecting the create context request message to the second converged network device, the access method provided in the embodiment of the present application further includes the following steps:
S2313-S2322 are similar to steps S2107-S2116 in the embodiment shown in fig. 21, except that: the target converged network device in steps S2107-S2116 is replaced by the second converged network device in the embodiment of the present application, and the rest of the related description may refer to the embodiment shown in fig. 21, which is not described herein again.
Based on the switching method provided by the embodiment of the application, the successful switching of the double registration terminals can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The related technical effect analysis can refer to the related description of the switching system part, and is not described in detail herein.
The actions of the first converged network device in steps S2301 to S2322 may be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, for example, as shown in fig. 24, a first network in the handover system shown in fig. 4 is a 4G network, a second network is a 5G network, and a source MME does not improve a selection algorithm of a target MME, and cannot ensure that a correct converged network device is selected for a dual registration terminal to perform processing, the handover method provided in the embodiment of the present application includes the following steps:
s2401 to S2407, similar to the steps S2201 to S2207 in the embodiment shown in fig. 22, for the related description, reference may be made to the embodiment shown in fig. 22, and details are not repeated here.
S2408, the first converged network device obtains address information of a target AMF network element for allocating 5G-GUTI to the terminal and address information of a candidate MME capable of providing service for the target E-UTRAN device.
Optionally, in this embodiment of the application, the first converged network device may obtain the address information of the target AMF network element that allocates the 5G-GUTI to the terminal in a manner that the first converged network device obtains the address information of the second converged network device in the embodiment shown in fig. 22, which may specifically refer to the embodiment shown in fig. 22 and is not described herein again.
Optionally, in this embodiment of the application, the first converged network device may obtain, according to the identifier of the target E-UTRAN device or the identifier of the tracking area served by the target E-UTRAN device, address information of a candidate MME capable of providing service for the target E-UTRAN device, and related descriptions may refer to step S1807 in the embodiment shown in fig. 18, which is not described herein again. Or, in this embodiment of the present application, the source MME may carry, in a forward redirection request message sent to the first converged network device, address information of a candidate MME that is capable of providing a service for the target E-UTRAN device and is acquired by the source MME, so that the first converged network device may acquire address information of the candidate MME that is capable of providing a service for the target E-UTRAN device, which is not specifically limited in this embodiment of the present application.
S2409, the first converged network device determines that the address information of the target AMF network element is in the address information of the candidate MME, and then the first converged network device determines that the terminal accesses the 5G network through the second converged network device connected with the target E-UTRAN device.
At this time, correspondingly, the first converged network device may determine the address information of the target AMF network element as the address information of the second converged network device.
Further, in the embodiment of the present application, the forwarding redirection request message may be redirected to the second converged network device in any one of the following manners one to three.
The first method includes the following steps S2410 a:
s2410a, similar to step S2211a in the embodiment shown in FIG. 22, for related descriptions, reference may be made to the embodiment shown in FIG. 22, which is not repeated herein.
Alternatively, the second method includes the following steps S2410b-S2411 b:
s2410b-S2411b are similar to S2211b-S2212b in the embodiment shown in FIG. 22, and the related descriptions refer to the embodiment shown in FIG. 22 and are not repeated herein.
Alternatively, the third method includes the following step S2410 c:
s2410c, similar to step S2211c in the embodiment shown in FIG. 22, for related descriptions, reference may be made to the embodiment shown in FIG. 22, which is not repeated herein.
Further, after redirecting the forward redirection request message to the second converged network device, the handover method provided in the embodiment of the present application further includes the following steps S2412-S2421:
S2412-S2421 and the synchronization steps S2213-S2222, the related description may refer to the embodiment shown in fig. 22, and will not be repeated herein.
Based on the switching method provided by the embodiment of the application, the successful switching of the double registration terminals can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The related technical effect analysis can refer to the related description of the switching system part, and is not described in detail herein.
The actions of the first converged network device in steps S2401 to S2421 may be executed by the processor 601 in the communication device 600 shown in fig. 6 calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
Optionally, for example, as shown in fig. 25, the first network in the handover system shown in fig. 4 is a 5G network, the second network is a 4G network, and the selection algorithm of the source AMF network element on the target AMF network element is not improved, and it cannot be guaranteed that a correct converged network device is selected for the dual registration terminal to perform processing, the handover method provided in the embodiment of the present application includes the following steps:
s2501 to S2507, similar to the steps S2301 to S2307 in the embodiment shown in fig. 23, the related description may refer to the embodiment shown in fig. 23, and will not be repeated herein.
S2508, the first converged network device obtains address information of a target MME which allocates 4G-GUTI for the terminal and address information of candidate AMF network elements which can provide service for the target NG-AN device.
Optionally, in this embodiment of the application, the first converged network device may obtain the address information of the target MME that allocates the 4G-GUTI to the terminal in a manner that the first converged network device obtains the address information of the second converged network device in the embodiment shown in fig. 23, which may specifically refer to the embodiment shown in fig. 23 and is not described herein again.
Optionally, in this embodiment of the application, the first converged network device may obtain, according to the identifier of the target NG-AN device or the identifier of the tracking area served by the target NG-AN device, address information of candidate AMF network elements capable of providing services for the target NG-AN device, and related descriptions may refer to step S1907 in the embodiment shown in fig. 19, which is not described herein again. Or, in this embodiment of the present application, the source AMF network element may carry, in the context creation request message sent to the first converged network device, address information of candidate AMF network elements capable of providing services for the target NG-AN device, which is acquired by the source AMF network element, so that the first converged network device may acquire address information of candidate AMF network elements capable of providing services for the target NG-AN device, which is not specifically limited in this embodiment of the present application.
S2509, the first converged network device determines that the address information of the target MME is in the address information of the candidate AMF network element, and then the first converged network device determines that the second converged network device connected with the terminal through the target NG-AN device accesses the 4G network.
At this time, correspondingly, the first converged network device may determine the address information of the target MME as the address information of the second converged network device.
Further, in the embodiment of the present application, the forwarding redirection request message may be redirected to the second converged network device in any one of the following manners one to three.
The first method includes the following step S2510 a:
s2510a, similar to step S2311a in the embodiment shown in fig. 23, the related description may refer to the embodiment shown in fig. 23, and will not be repeated here.
Alternatively, the second method includes the following steps S2510b-S2511 b:
s2510b-S2511b, similar to the steps S2311b-S2312b in the embodiment shown in FIG. 23, the related description may refer to the embodiment shown in FIG. 23, and the description is omitted here.
Alternatively, the third method includes the following step S2510 c:
s2510c, similar to step S2311c in the embodiment shown in fig. 23, the related description may refer to the embodiment shown in fig. 23, and will not be repeated here.
Further, after redirecting the create context request message to the second converged network device, the handover method provided in the embodiment of the present application further includes the following steps S2512 to S2521:
S2512-S2521 and synchronization steps S2313-S2322, the related description may refer to the embodiment shown in FIG. 23, and will not be repeated herein.
Based on the switching method provided by the embodiment of the application, the successful switching of the double registration terminals can be realized on the premise of simplifying the complexity of network deployment and reducing the workload of network operation and maintenance. The related technical effect analysis can refer to the related description of the switching system part, and is not described in detail herein.
The actions of the first converged network device in steps S2501 to S2521 may be executed by the processor 601 in the communication device 600 shown in fig. 6 by calling the application program code stored in the memory 603, which is not limited in this embodiment of the present application.
The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between network elements. It is to be understood that, in order to implement the above functions, the access device, the first converged network device or the source mobility management network element includes a hardware structure and/or a software module corresponding to the execution of each function. Those of skill in the art would readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiment of the present application, according to the above method example, the access device, the first converged network device, or the source mobility management network element may be divided into the functional modules, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
For example, in the case of dividing each functional module in an integrated manner, fig. 26 shows a schematic structural diagram of an access device 260. The access device 260 is an access device in a first network, and the access device 260 includes: a transceiver module 2602 and a processing module 2601. The transceiver module 2602 is configured to receive an access request from a terminal, where the access request carries a first mobility management identifier and a third mobility management identifier, where the first mobility management identifier is an identifier of a first mobility management network element in a first network, and the third mobility management identifier is a mapping mobility management identifier in the first network obtained by mapping a mobility management identifier in a GUTI of the terminal in a second network, where the first network and the second network are different types of networks. A processing module 2601, configured to determine, according to the first mobility management identifier, a target converged network device according to a third mobility management identifier when it is determined that there is no connection between the first mobility management element and the access device 260, where a mapping mobility management identifier, in the first network, corresponding to the target converged network device when the target converged network device is used as a mobility management element in the second network is the third mobility management identifier, and the target converged network device is used for the terminal to access the first network.
Optionally, the transceiver module 2602 is further configured to send an establishment request to the target converged network device, where the establishment request is used to request registration to the target converged network device; the transceiver module 2602 is further configured to establish a response from the target converged network device, where the established response carries a second mobility management identifier and a third mobility management identifier, where the second mobility management identifier is an original mobility management identifier corresponding to the target converged network device serving as a second mobility management network element in the first network.
All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
In the present embodiment, the access device 260 is presented in the form of dividing each functional module in an integrated manner. A "module" herein may refer to a particular ASIC, a circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that provides the described functionality. In a simple embodiment, one skilled in the art will recognize that the access device 260 may take the form shown in FIG. 6.
For example, processor 601 in fig. 6 may cause access device 260 to perform the access method in the above-described method embodiments by calling a computer stored in memory 603 to execute instructions.
In particular, the functions/implementation procedures of the transceiver module 2602 and the processing module 2601 in fig. 26 may be implemented by the processor 601 in fig. 6 calling a computer executing instructions stored in the memory 603. Alternatively, the functions/implementation procedures of the processing module 2601 in fig. 26 may be implemented by the processor 601 in fig. 6 calling a computer executing instruction stored in the memory 603, and the functions/implementation procedures of the transceiver module 2602 in fig. 26 may be implemented by the communication interface 604 in fig. 6.
Since the access device 260 provided in this embodiment can execute the above access method, the technical effects obtained by the access device can refer to the above method embodiment, and are not described herein again.
Optionally, an apparatus (for example, the apparatus may be a chip system) is further provided in this embodiment of the present application, where the apparatus includes a processor, configured to support an access device to implement the foregoing access method, for example, when it is determined that there is no connection between a first mobility management network element and the access device according to a first mobility management identifier, a target converged network device is determined according to a third mobility management identifier. In one possible design, the apparatus further includes a memory. The memory is used for storing necessary program instructions and data for the access device. Of course, the memory may not be in the device. When the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which is not specifically limited in this application embodiment.
For example, in a case where each functional module is divided in an integrated manner, fig. 27 shows a schematic structural diagram of a first converged network device 270. The first converged network device 270 includes: a transceiver module 2702 and a processing module 2701. The transceiver module 2702 is configured to receive an access request from an access device in a first network, where the access request carries a GUTI of a terminal in a second network, and the first network and the second network are different types of networks. The processing module 2701 is configured to determine, according to the GUTI, that the terminal accesses the second network through the second converged network device connected by the access device. The transceiver module 2702 is further configured to send an access request to the second converged network device, where the access request is used for the terminal to access the first network through the second converged network device.
Optionally, the processing module 2701 is specifically configured to: determining that the GUTI is not a GUTI assigned by the first converged network device 270; and determining that the mobility management resource pool to which the mobility management element allocated with the GUTI belongs is the same as the mobility management resource pool to which the first converged network device 270 belongs when serving as the mobility management element in the second network, and determining that the terminal accesses the second network through the second converged network device connected by the access device.
Or, optionally, the processing module 2701 is specifically configured to: determining that the GUTI is not a GUTI assigned by the first converged network device 270; acquiring address information of a target mobility management network element for allocating a GUTI to a terminal and address information of a candidate mobility management network element capable of providing service for access equipment in a first network; and under the condition that the information of the target mobility management network element is in the address information of the candidate mobility management network element, determining that the terminal accesses the second network through the second converged network device connected by the access device.
Optionally, the transceiver module 2702 is configured to send an access request to the second converged network device, specifically: the device is used for sending a rerouting request message to the access equipment, wherein the rerouting request message carries the access request and a mapping mobile management identifier in the first network obtained by mapping the first mobile management identifier in the GUTI, and the mapping mobile management identifier is used for the access equipment to send the access request to the second converged network equipment.
Optionally, the processing module 2701 is further configured to obtain address information of the second converged network device according to the GUTI. Correspondingly, the transceiver module 2702 is configured to send an access request to the second converged network device, specifically: and the access request is sent to the second converged network device according to the address information of the second converged network device.
Optionally, the processing module 2701 is configured to obtain address information of the second converged network device according to the GUTI, and specifically: the system comprises a first request message, a second request message and a third request message, wherein the first request message carries a mapping mobile management identifier in a first network obtained by mapping a first mobile management identifier in a GUTI and is used for inquiring address information of second converged network equipment; and the first response message carries the address information of the second converged network device.
In one possible implementation, the first network is a 4G network, and the second network is a 5G network; correspondingly, the transceiver module 2702 is configured to send a first request message, specifically: the DNS server is used for sending a first request message to the DNS server; correspondingly, the transceiver module 2702 is configured to receive a first response message, specifically: for receiving a first response message from the DNS server.
In another possible implementation manner, the first network is a 5G network, and the second network is a 4G network; correspondingly, the transceiver module 2702 is configured to send a first request message, specifically: the network storage function network element is used for sending a first request message to the network storage function network element; correspondingly, the transceiver module 2702 is configured to receive a first response message, specifically: for receiving a first response message from the network storage function network element.
Optionally, the processing module 2701 is configured to obtain address information of the second converged network device according to the GUTI, and specifically: the second request message carries the first mobile management identifier in the GUTI and is used for inquiring the address information of the second converged network equipment; and receiving a second response message, wherein the second response message carries the address information of the second converged network device.
In one possible implementation, the first network is a 4G network, and the second network is a 5G network; correspondingly, the transceiver module 2702 is configured to send a second request message, specifically: for sending the second request message to the network storage function network element. Correspondingly, the transceiver module 2702 is configured to receive a second response message, specifically: for receiving a second response message from the network storage function network element.
In another possible implementation manner, the first network is a 5G network, and the second network is a 4G network; correspondingly, the transceiver module 2702 is configured to send a second request message, specifically: the DNS server is used for sending a second request message to the DNS server; correspondingly, the transceiver module 2702 is configured to receive a second response message, specifically: for receiving a second response message from the DNS server.
Optionally, the processing module 2701 is further configured to determine address information of the target mobility management element as address information of the second converged network device; correspondingly, the transceiver module 2702 is configured to send an access request to the second converged network device, specifically: and the access request is sent to the second converged network device according to the address information of the second converged network device.
Optionally, the processing module 2701 is configured to obtain address information of a target mobility management element that allocates a GUTI to the terminal, and specifically, the address information is: the mobile management system is used for sending a first request message, wherein the first request message carries a mapping mobile management identifier in a first network obtained by mapping a first mobile management identifier in a GUTI (globally unique identifier), and is used for inquiring the address information of a target mobile management network element; and receiving a first response message, wherein the first response message carries the address information of the target mobile management network element.
In one possible implementation, the first network is a 4G network, and the second network is a 5G network; correspondingly, the transceiver module 2702 is configured to send a first request message, specifically: the DNS server is used for sending a first request message to the DNS server; correspondingly, the transceiver module 2702 is configured to receive a first response message, specifically: for receiving a first response message from the DNS server.
In another possible implementation manner, the first network is a 5G network, and the second network is a 4G network; correspondingly, the transceiver module 2702 is configured to send a first request message, specifically: the network storage function network element is used for sending a first request message to the network storage function network element; correspondingly, the transceiver module 2702 is configured to receive a first response message, specifically: for receiving a first response message from the network storage function network element.
Optionally, the processing module 2701 is configured to obtain address information of a target mobility management element that allocates a GUTI to the terminal, and specifically, the address information is: the second request message carries the first mobile management identifier in the GUTI and is used for inquiring the address information of a target mobile management network element for allocating the GUTI to the terminal; and receiving a second response message, wherein the second response message carries the address information of the target mobile management network element.
In one possible implementation, the first network is a 4G network, and the second network is a 5G network; correspondingly, the transceiver module 2702 is configured to send a second request message, specifically: the network storage function network element is used for sending a second request message to the network storage function network element; correspondingly, the transceiver module 2702 is configured to receive a second response message, specifically: for receiving a second response message from the network storage function network element.
In another possible implementation manner, the first network is a 5G network, and the second network is a 4G network; correspondingly, the transceiver module 2702 is configured to send a second request message, specifically: the DNS server is used for sending a second request message to the DNS server; correspondingly, the first converged network device 270 receives the second response message, specifically: a second response message is received from the DNS server.
Optionally, the processing module 2701 is configured to obtain address information of a candidate mobility management network element that can provide a service for an access device in a first network, and specifically, the address information is: for receiving address information of candidate mobility management network elements from a source mobility management network element capable of serving an access device in a first network.
Or, optionally, the processing module 2701 is configured to obtain address information of a candidate mobility management network element that can provide a service for an access device in a first network, where the address information is specifically:
the tracking area management method comprises the steps of receiving identification of access equipment from a source mobile management network element or identification of a tracking area served by the access equipment; and acquiring address information of candidate mobile management network elements capable of providing service for the access equipment in the first network according to the identification of the access equipment or the identification of the tracking area served by the access equipment.
All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
In this embodiment, the first converged network device 270 is presented in a form of dividing each functional module in an integrated manner. A "module" herein may refer to a particular ASIC, a circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that provides the described functionality. In a simple embodiment, those skilled in the art will appreciate that the first converged network device 270 may take the form shown in fig. 6.
For example, the processor 601 in fig. 6 may cause the first converged network device 270 to execute the access method in the above method embodiment by calling a computer executing instruction stored in the memory 603.
In particular, the functions/implementation procedures of the transceiver module 2702 and the processing module 2701 in fig. 27 can be implemented by the processor 601 in fig. 6 calling a computer executing instructions stored in the memory 603. Alternatively, the functions/implementation procedures of the processing module 2701 in fig. 27 can be implemented by the processor 601 in fig. 6 calling a computer executing instructions stored in the memory 603, and the functions/implementation procedures of the transceiving module 2702 in fig. 27 can be implemented by the communication interface 604 in fig. 6.
Since the first converged network device 270 provided in this embodiment can execute the above access method, the technical effect obtained by the first converged network device can refer to the above method embodiment, and is not described herein again.
Optionally, an apparatus (for example, the apparatus may be a chip system) provided in this embodiment of the present application, where the apparatus includes a processor, configured to support the first converged network device to implement the above access method, and determine, for example, according to the GUTI, that the terminal has accessed the second network through the second converged network device connected to the access device. In one possible design, the apparatus further includes a memory. The memory is used for storing necessary program instructions and data of the first converged network device. Of course, the memory may not be in the device. When the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which is not specifically limited in this application embodiment.
For example, in the case of dividing the functional modules in an integrated manner, fig. 28 shows a schematic structural diagram of a source mobility management network element 280. The source mobility management element 280 is a source mobility management element in a first network, and the source mobility management element 280 includes: a transceiver module 2802 and a processing module 2801. A transceiver module 2802, configured to receive a handover requirement from a first access device in a first network, where the handover requirement carries an identifier of a second access device of the first network or an identifier of a tracking area served by the second access device, and a GUTI of the terminal in a second network, where the first network and the second network are different types of networks. A processing module 2801, configured to obtain an identifier list and address information of the candidate mobility management network element according to the identifier of the second access device or the identifier of the tracking area. The processing module 2801 is further configured to determine a target converged network device according to the GUTI and the identifier list of the candidate mobility management network element, where the target converged network device is a converged network device corresponding to one identifier in the identifier list of the candidate mobility management network element. The transceiver module 2802 is further configured to send a request message to the target converged network device according to the address information of the target converged network device included in the address information of the candidate mobility management network element, where the request message is used to switch the terminal to the target converged network device.
Optionally, the processing module 2801 is configured to determine, according to the GUTI and the identifier list of the candidate mobility management network element, a target converged network device, which is specifically: the mobile management identifier is used for determining the mapping of the first mobile management identifier in the GUTI in the first network; and determining the converged network equipment corresponding to the identifier which is the same as the mapping mobile management identifier in the identifier list of the candidate mobile management network elements as the target converged network equipment.
All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
In the present embodiment, the source mobility management element 280 is presented in the form of dividing the various functional modules in an integrated manner. A "module" herein may refer to a particular ASIC, a circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that provides the described functionality. In a simple embodiment, it will be appreciated by those skilled in the art that the source mobility management element 280 may take the form shown in fig. 6.
For example, the processor 601 in fig. 6 may cause the source mobility management network element 280 to perform the handover method in the above-described method embodiment by calling a computer to execute instructions stored in the memory 603.
In particular, the functions/implementation of the transceiver module 2802 and the processing module 2801 in fig. 28 may be implemented by the processor 601 in fig. 6 calling computer-executable instructions stored in the memory 603. Alternatively, the functions/implementation of the processing module 2801 in fig. 28 may be implemented by the processor 601 in fig. 6 calling a computer executing instructions stored in the memory 603, and the functions/implementation of the transceiver module 2802 in fig. 28 may be implemented by the communication interface 604 in fig. 6.
Since the source mobility management element 280 provided in this embodiment may perform the handover method, the technical effect obtained by the source mobility management element 280 may refer to the method embodiment described above, and will not be described herein again.
Optionally, an embodiment of the present application further provides an apparatus (for example, the apparatus may be a chip system), where the apparatus includes a processor, configured to support a source mobility management element to implement the foregoing handover method, and determine a target converged network device according to, for example, a GUTI and an identifier list of a candidate mobility management element. In one possible design, the apparatus further includes a memory. The memory is used for storing program instructions and data necessary for the source mobility management network element. Of course, the memory may not be in the device. When the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which is not specifically limited in this application embodiment.
For example, in the case of dividing each functional module in an integrated manner, fig. 29 shows a first converged network device 290, where the first converged network device 290 includes: a transceiver module 2902 and a processing module 2901. A transceiver module 2902, configured to receive address information of a source mobility management network element from a source mobility management network element in a first network and a GUTI of the terminal in a second network, where the first network and the second network are different types of networks. A processing module 2901, configured to determine, according to the GUTI, that the terminal has accessed the second network through the second converged network device capable of providing the service for the target access device in the first network. The transceiving module 2902 is further configured to send, to the second converged network device, the GUTI and the address information of the source mobility management network element according to the address information of the second converged network device, where the GUTI and the address information of the source mobility management network element are used to switch the terminal to the second converged network device.
Optionally, the transceiver module 2902 is configured to send, according to the address information of the second converged network device, the GUTI and the address information of the source mobility management network element to the second converged network device, and specifically: and the indication information is used for indicating the source mobility management network element to send the GUTI and the address information of the source mobility management network element to the second converged network device according to the address information of the second converged network device.
Optionally, the processing module 2901 is configured to determine, according to the GUTI, that the terminal accesses the second network through the second converged network device capable of providing service for the target access device in the first network, specifically: for determining that the GUTI is not a GUTI assigned by the first converged network device 290; if it is determined that the mobility management resource pool to which the mobility management element allocated with the GUTI belongs is the same as the mobility management resource pool to which the first converged network device 290 belongs when serving as the mobility management element in the second network, it is determined that the terminal has accessed the second network through the second converged network device capable of providing service for the target access device in the first network.
Optionally, the processing module 2901 is further configured to obtain address information of the second converged network device according to the GUTI.
Optionally, the processing module 2901 is configured to determine, according to the GUTI, that the terminal accesses the second network through the second converged network device capable of providing service for the target access device in the first network, specifically: for determining that the GUTI is not a GUTI assigned by the first converged network device 290; acquiring address information of a target mobility management network element for allocating a GUTI to a terminal and address information of a candidate mobility management network element capable of providing service for target access equipment in a first network; and under the condition that the information of the target mobility management network element is in the address information of the candidate mobility management network element, determining that the terminal accesses the second network through a second converged network device which can provide service for the target access device in the first network. Correspondingly, the processing module 2901 is further configured to determine the address information of the target mobility management network element as the address information of the second converged network device.
Optionally, the processing module 2901 is configured to acquire address information of a candidate mobility management network element that can provide a service for a target access device in a first network, and specifically, the address information includes: for receiving address information of candidate mobility management network elements from a source mobility management network element capable of serving a target access device in a first network.
Or, optionally, the processing module 2901 is configured to acquire address information of a candidate mobility management network element that can provide a service for a target access device in a first network, and specifically, the address information is: the tracking area management method comprises the steps of receiving an identifier of target access equipment from a source mobile management network element or an identifier of a tracking area served by the target access equipment; and acquiring address information of candidate mobile management network elements capable of providing service for the target access equipment in the first network according to the identification of the target access equipment or the identification of a tracking area served by the target access equipment.
All relevant contents of each step related to the above method embodiment may be referred to the functional description of the corresponding functional module, and are not described herein again.
In this embodiment, the first converged network device 290 is presented in a form of dividing each functional module in an integrated manner. A "module" herein may refer to a particular ASIC, a circuit, a processor and memory that execute one or more software or firmware programs, an integrated logic circuit, and/or other device that provides the described functionality. In a simple embodiment, those skilled in the art will appreciate that the first converged network device 290 may take the form shown in fig. 6.
For example, the processor 601 in fig. 6 may cause the first converged network device 290 to execute the handover method in the above method embodiment by calling a computer executing instruction stored in the memory 603.
In particular, the functions/implementation procedures of the transceiver module 2902 and the processing module 2901 in fig. 29 may be implemented by the processor 601 in fig. 6 calling a computer executing instruction stored in the memory 603. Alternatively, the functions/implementation procedures of the processing module 2901 in fig. 29 may be implemented by the processor 601 in fig. 6 calling a computer executing instruction stored in the memory 603, and the functions/implementation procedures of the transceiving module 2902 in fig. 29 may be implemented by the communication interface 604 in fig. 6.
Since the first converged network device 290 provided in this embodiment can execute the handover method, the technical effects obtained by the first converged network device can refer to the method embodiments described above, and are not described herein again.
Optionally, an apparatus (for example, the apparatus may be a chip system) provided in this embodiment of the present application, where the apparatus includes a processor, configured to support the first converged network device to implement the foregoing handover method, and determine, for example, according to the GUTI, that the terminal has accessed the second network through a second converged network device capable of providing a service for a target access device in the first network. In one possible design, the apparatus further includes a memory. The memory is used for storing necessary program instructions and data of the first converged network device. Of course, the memory may not be in the device. When the device is a chip system, the device may be composed of a chip, and may also include a chip and other discrete devices, which is not specifically limited in this application embodiment.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented using a software program, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions described in accordance with the embodiments of the present application are all or partially generated upon loading and execution of computer program instructions on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or can comprise one or more data storage devices, such as a server, a data center, etc., that can be integrated with the medium. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
Although the present application has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the application. Accordingly, the specification and figures are merely exemplary of the present application as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the present application. It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (14)

1. An access method, characterized in that the access method comprises:
an access device in a first network receives an access request from a terminal, wherein the access request carries a first mobility management identifier and a third mobility management identifier, the first mobility management identifier is an identifier of a first mobility management network element in the first network, the third mobility management identifier is a mapping mobility management identifier in the first network obtained by mapping a mobility management identifier in a globally unique temporary identifier GUTI of the terminal in a second network, and the first network and the second network are different types of networks;
and when the access device determines that the first mobility management element and the access device are not connected according to the first mobility management identifier, the access device determines a target converged network device according to the third mobility management identifier, wherein a mapping mobility management identifier in the first network corresponding to the target converged network device as the mobility management element in the second network is the third mobility management identifier, and the target converged network device is used for accessing the first network by the terminal.
2. The access method according to claim 1, wherein before the access device in the first network receives the access request from the terminal, the access method further comprises:
the access equipment sends an establishment request to the target converged network equipment, wherein the establishment request is used for requesting to register to the target converged network equipment;
the access device receives an establishment response from the target converged network device, where the establishment response carries a second mobility management identifier and the third mobility management identifier, where the second mobility management identifier is an original mobility management identifier corresponding to the target converged network device serving as a second mobility management network element in the first network.
3. The access method according to claim 1 or 2, wherein the first network is a fourth generation 4G network and the second network is a fifth generation 5G network; correspondingly, the first mobility management identifier is a first globally unique mobility management entity identifier GUMMEI, and the third mobility management identifier is a third GUMMEI.
4. The access method according to claim 1 or 2, wherein the first network is a 5G network and the second network is a 4G network; correspondingly, the first mobility management identifier is a first globally unique access and mobility management function identifier GUAMI, and the third mobility management identifier is a third GUAMI.
5. A handover method, the handover method comprising:
a source mobile management network element in a first network receives a handover requirement from first access equipment in the first network, wherein the handover requirement carries an identifier of second access equipment of the first network or an identifier of a tracking area served by the second access equipment, and a Globally Unique Temporary Identifier (GUTI) of a terminal in the second network, and the first network and the second network are different types of networks;
the source mobility management network element acquires an identification list and address information of candidate mobility management network elements according to the identification of the second access device or the identification of the tracking area;
the source mobility management network element determines target converged network equipment according to the GUTI and the identifier list of the candidate mobility management network elements, wherein the target converged network equipment is converged network equipment corresponding to one identifier in the identifier list of the candidate mobility management network elements;
and the source mobility management network element sends a request message to the target convergence network device according to the address information of the target convergence network device included in the address information of the candidate mobility management network element, wherein the request message is used for switching the terminal to the target convergence network device.
6. The handover method according to claim 5, wherein the source mobility management element determines the target converged network device according to the GUTI and the identifier list of the candidate mobility management element, and specifically includes:
the source mobility management network element determines a mapping mobility management identifier of a first mobility management identifier in the GUTI in the first network;
and the source mobility management network element determines the converged network device corresponding to the identifier which is the same as the mapping mobility management identifier in the identifier list of the candidate mobility management network element as the target converged network device.
7. The handover method according to claim 6, wherein the first network is a fourth generation 4G network, and the second network is a fifth generation 5G network; correspondingly, the first mobility management identifier is a globally unique access and mobility management function identifier GUAMI, and the mapping mobility management identifier is a globally unique mobility management entity identifier GUMMEI.
8. The handover method according to claim 6, wherein the first network is a 5G network and the second network is a 4G network; correspondingly, the first mobile management identifier is a GUMMEI, and the mapping mobile management identifier is a GUAMI.
9. An access device, the access device being an access device in a first network, the access device comprising: a transceiver module and a processing module;
the transceiver module is configured to receive an access request from a terminal, where the access request carries a first mobility management identifier and a third mobility management identifier, where the first mobility management identifier is an identifier of a first mobility management network element in the first network, and the third mobility management identifier is a mapping mobility management identifier in the first network that is mapped by a mobility management identifier in a globally unique temporary identifier GUTI of the terminal in a second network, where the first network and the second network are different types of networks;
the processing module is configured to determine, according to the first mobility management identifier, a target converged network device according to the third mobility management identifier when it is determined that there is no connection between the first mobility management network element and the access device according to the first mobility management identifier, where a mapping mobility management identifier in the first network corresponding to the target converged network device serving as the mobility management network element in the second network is the third mobility management identifier, and the target converged network device is used for the terminal to access the first network.
10. The access device of claim 9,
the transceiver module is further configured to send an establishment request to the target converged network device, where the establishment request is used to request registration to the target converged network device;
the transceiver module is further configured to establish a response from the target converged network device, where the establish response carries a second mobility management identifier and the third mobility management identifier, where the second mobility management identifier is an original mobility management identifier corresponding to the target converged network device serving as a second mobility management network element in the first network.
11. A source mobility management element, the source mobility management element being a source mobility management element in a first network, the source mobility management element comprising: a transceiver module and a processing module;
the transceiver module is configured to receive a handover requirement from a first access device in the first network, where the handover requirement carries an identifier of a second access device of the first network or an identifier of a tracking area served by the second access device, and a globally unique temporary identifier GUTI of a terminal in a second network, where the first network and the second network are different types of networks;
the processing module is configured to obtain an identifier list and address information of a candidate mobility management network element according to the identifier of the second access device or the identifier of the tracking area;
the processing module is further configured to determine a target converged network device according to the GUTI and the identifier list of the candidate mobility management element, where the target converged network device is a converged network device corresponding to one identifier in the identifier list of the candidate mobility management element;
the transceiver module is further configured to send a request message to the target converged network device according to the address information of the target converged network device included in the address information of the candidate mobility management network element, where the request message is used to switch the terminal to the target converged network device.
12. The source mobility management element according to claim 11, wherein the processing module is configured to determine, according to the GUTI and the identifier list of the candidate mobility management element, a target converged network device, specifically:
a mapping mobility management identity in the first network for determining a first mobility management identity in the GUTI; and determining the converged network equipment corresponding to the identifier which is the same as the mapping mobility management identifier in the identifier list of the candidate mobility management network element as the target converged network equipment.
13. An access system, comprising a converged network device and an access device in a first network;
the access device is configured to receive an access request from a terminal, where the access request carries a first mobility management identifier and a third mobility management identifier, where the first mobility management identifier is an identifier of a first mobility management network element in the first network, and the third mobility management identifier is a mapping mobility management identifier in the first network, which is obtained by mapping a mobility management identifier in a globally unique temporary identifier GUTI of the terminal in a second network, and the first network and the second network are different types of networks;
the access device is further configured to determine, according to the first mobility management identifier, a target converged network device and send the access request to the target converged network device under the condition that no connection between the first mobility management network element and the access device is determined according to the first mobility management identifier, where a mapped mobility management identifier in the first network corresponding to the target converged network device serving as the mobility management network element in the second network is the third mobility management identifier;
the target converged network device is configured to receive the access request from the access device, where the access request is used for the terminal to access the first network through the target converged network device.
14. A switching system, characterized in that the switching system comprises: the system comprises a first access device in a first network, a source mobile management network element in the first network and a target convergence network device;
the first access device is configured to send a handover requirement to the source mobility management network element, where the handover requirement carries an identifier of a second access device of the first network or an identifier of a tracking area served by the second access device, and a globally unique temporary identifier GUTI of a terminal in a second network, where the first network and the second network are different types of networks;
the source mobility management network element is configured to receive the handover requirement from the first access device, and obtain an identifier list and address information of a candidate mobility management network element according to an identifier of the second access device or an identifier of the tracking area;
the source mobility management network element is further configured to determine a target converged network device according to the GUTI and the identifier list of the candidate mobility management network element, where the target converged network device is a converged network device corresponding to one identifier in the identifier list of the candidate mobility management network element;
the source mobility management network element is further configured to send a request message to the target converged network device according to the address information of the target converged network device included in the address information of the candidate mobility management network element;
the target converged network device is further configured to receive the request message from the source mobility management network element, where the request message is used to switch the terminal to the target converged network device.
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