CN111328114A - Switching control method and equipment - Google Patents
Switching control method and equipment Download PDFInfo
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- CN111328114A CN111328114A CN201811535566.9A CN201811535566A CN111328114A CN 111328114 A CN111328114 A CN 111328114A CN 201811535566 A CN201811535566 A CN 201811535566A CN 111328114 A CN111328114 A CN 111328114A
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- 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
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- 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
- H04W36/0033—Control or signalling for completing the hand-off for data sessions of end-to-end connection with transfer of context information
Abstract
The invention relates to the technical field of wireless communication, in particular to a switching control method and equipment, which are used for solving the problem that the conventional switching process cannot support cross-PLMN switching of AMF entity change. The source access network node of the embodiment of the invention determines a target access network node and a target PLMN; the source access network node determines that the PLMN changes and the Xn interface connection exists between the source access network node and the target access network node; and the source access network node judges whether Xn switching can be carried out or not, if the Xn switching can be carried out, the Xn switching is carried out, otherwise, the N2 switching is initiated. Because the embodiment of the invention provides a specific switching control scheme after the UE is switched across the PLMN, the source access network node can accurately control the switching process, and the system performance is further improved.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a handover control method and apparatus.
Background
The current 5G network architecture allows multiple operators to share network resources, mainly access network resources at present. The 5G network sharing architecture provides a shared network operator to allocate resources to the shared operator according to a Service-level agreement (SLA).
For example, as shown in fig. 1, in a network sharing scenario, an operator a, an operator B, and an operator C share the same access network device. In a Network sharing scenario, multiple operators use different Public Land Mobile Network (PLMN) Identities (IDs) to distinguish the respective networks.
In the above network sharing scenario, access network devices of different operators may be shared, and thus, in the occurrence of a cross-PLMN handover, even if the source access network node and the target access network node belong to different PLMNs, an Xn interface may exist between them, and thus, an Xn handover across PLMNs may occur. However, since the core network device cannot be shared, a change of the core network device serving the User Equipment (UE), such as a change of an Access and Mobility Management Function (AMF) entity, must occur during the inter-PLMN handover. Therefore, the problem with the prior art is that the existing handover procedure cannot support the cross-PLMN handover for AMF entity change.
Disclosure of Invention
The invention provides a switching control method and equipment, which are used for solving the problem that the conventional switching process cannot support cross-PLMN switching of AMF entity change.
Based on the foregoing problem, in a first aspect, an embodiment of the present invention provides a handover control method, including:
a source access network node determines a target access network node and a target PLMN;
the source access network node determines that the PLMN changes and the Xn interface connection exists between the source access network node and the target access network node;
and the source access network node judges whether Xn switching can be carried out or not, if the Xn switching can be carried out, the Xn switching is carried out, otherwise, the N2 switching is initiated.
Optionally, the determining, by the source access network node, whether Xn handover can be performed includes:
the source access network node determines that Xn switching can be performed after determining that connection of an NG interface exists between an AMF entity of the current service UE and a target access network node in a target PLMN according to OAM configuration information; or
And the source access network node receives the indication of the target access network node and judges whether Xn switching can be carried out or not.
Optionally, the determining, by the source access network node, that the connection between the AMF entity currently serving the UE and the NG interface of the target access network node in the target PLMN exists according to the following manner includes:
and after the source access network node determines that the target PLMN and the PLMN currently accessed by the UE are equivalent PLMNs or support core network sharing according to OAM configuration information, determining that the AMF entity currently serving the UE is connected with the NG interface of the target access network node in the target PLMN.
Optionally, before the source access network node receives the indication of the target access network node, the method further includes:
and the source access network node sends a switching request message containing a target PLMN identification and AMF information of the current service UE to the target access network node, so that the target access network node returns an indication of successful switching when determining that Xn switching can be carried out according to the target PLMN identification and the AMF information, otherwise returns an indication of failed switching.
Optionally, the receiving, by the source access network node, the indication of the target access network node, and determining whether Xn handover is possible includes:
and when receiving the indication of successful switching returned by the target access network node, the source access network node determines that the Xn switching can be carried out.
Optionally, the AMF information is GUAMI.
In a second aspect, an embodiment of the present invention further provides a handover control method, including:
a target access network node receives a switching request message which contains a target PLMN identification and AMF information of current service UE and is sent by a source access network node; the switching request message is sent after the source access network node determines that the PLMN changes and has Xn interface connection with the target access network node;
the target access network node judges whether Xn switching can be carried out or not according to the target PLMN identification and the AMF information;
and after determining that the Xn switching can be carried out, the target access network node returns a switching success indication to the source access network node, otherwise, a switching failure indication is returned to the source access network node.
Optionally, the determining, by the target access network node, whether Xn handover can be performed according to the target PLMN identifier and the AMF information includes:
the target access network node judges whether the target access network node can establish connection with the AMF or not according to the target PLMN identification and the AMF information;
and when the connection with the AMF entity can be established, the target access network node determines that the Xn handover can be carried out.
Optionally, the determining, by the target access network node, whether Xn handover can be performed according to the target PLMN identity and the AMF information includes:
the target access network node determines an AMF information list capable of serving the UE in the target PLMN according to the target PLMN identification;
and when the AMF information is in the AMF information list, the target access network node determines that Xn handover can be carried out.
In a third aspect, an embodiment of the present invention provides a source access network node, including a processor, a memory, and a transceiver;
wherein the processor is configured to read a program in the memory and execute:
determining a target access network node and a target PLMN;
determining that the PLMN changes and the Xn interface connection exists between the PLMN and the target access network node;
judging whether Xn switching can be carried out or not, if yes, carrying out Xn switching, and otherwise, initiating N2 switching.
Optionally, the processor is specifically configured to:
determining that Xn switching can be performed after determining that an NG interface exists between an AMF entity of the current service UE and a target access network node in a target PLMN according to OAM configuration information; or
And receiving the indication of the target access network node, and judging whether Xn switching can be carried out or not.
Optionally, the processor is specifically configured to:
and after determining that the target PLMN and the PLMN currently accessed by the UE are equivalent PLMNs or support core network sharing according to OAM configuration information, determining that the AMF entity currently serving the UE is connected with a target access network node in the target PLMN through an NG interface.
Optionally, the processor is further configured to:
and before receiving the indication of the target access network node, sending a switching request message containing a target PLMN identification and AMF information of the current service UE to the target access network node, so that the target access network node returns an indication of successful switching when determining that Xn switching can be carried out according to the target PLMN identification and the AMF information, otherwise, returns an indication of failed switching.
Optionally, the processor is specifically configured to:
and when receiving the indication of successful switching returned by the target access network node, determining that the Xn switching can be carried out.
Optionally, the AMF information is GUAMI.
In a fourth aspect, an embodiment of the present invention provides a target access network node, including a processor, a memory, and a transceiver;
wherein the processor is configured to read a program in the memory and execute:
receiving a switching request message which contains a target PLMN identification and AMF information of current service UE and is sent by a source access network node; the switching request message is sent after the source access network node determines that the PLMN changes and has Xn interface connection with the target access network node;
judging whether Xn switching can be carried out or not according to the target PLMN identification and the AMF information;
and after determining that the Xn switching can be carried out, returning a switching success indication to the source access network node, otherwise, returning a switching failure indication to the source access network node.
Optionally, the processor is specifically configured to:
judging whether the target access network node can establish connection with the AMF or not according to the target PLMN identification and the AMF information; determining that an Xn handover is possible when a connection with the AMF entity can be established.
Optionally, the processor is specifically configured to:
determining an AMF information list capable of serving the UE in the target PLMN according to the target PLMN identification; determining that an Xn handover is possible when the AMF information is in the AMF information list.
In a fifth aspect, an embodiment of the present invention provides a source access network node, including:
a first determining module, configured to determine a target access network node and a target PLMN;
a second determining module, configured to determine that a PLMN changes and an Xn interface connection exists between the target access network node and the PLMN;
and the processing module is used for judging whether Xn switching can be carried out, if the Xn switching can be carried out, the Xn switching is carried out, otherwise, the N2 switching is initiated.
In a sixth aspect, an embodiment of the present invention provides a target access network node, including:
a receiving module, configured to receive a handover request message sent by a source access network node and including a target PLMN identity and AMF information of a currently serving UE; the switching request message is sent after the source access network node determines that the PLMN changes and has Xn interface connection with the target access network node;
the judging module is used for judging whether Xn switching can be carried out or not according to the target PLMN identification and the AMF information;
and the sending module is used for returning a switching success indication to the source access network node after determining that the Xn switching can be carried out, and otherwise, returning a switching failure indication to the source access network node.
In a seventh aspect, embodiments of the present invention provide a computer-readable medium on which a computer program is stored, which when executed by a processor implements the steps of the method according to the first aspect or implements the steps of the method according to the second aspect.
The embodiment of the invention provides a switching control method, when UE needs to switch an access network node, a source access network node determines an accessed target access network node and a target PLMN, judges whether the PLMN used by the UE after the UE is switched to the target access network node changes, judges whether Xn switching can be carried out or not after the PLMN accessed after the UE is switched to the target access network node is determined to change, carries out Xn switching when the Xn switching can be carried out, and otherwise initiates N2 switching. The embodiment of the invention provides a specific switching control scheme after the UE is switched across the PLMN, and can support the switching across the PLMN changed by the AMF entity, and the source access network node can accurately control the switching process, thereby further improving the system performance.
Drawings
FIG. 1 is a diagram of a network sharing architecture in the background art;
FIG. 2 is a system architecture diagram according to an embodiment of the present invention;
FIG. 3 is a flowchart of a handover control method according to an embodiment of the present invention;
fig. 4 is a flowchart of a first method for performing handover control according to a first embodiment of the present invention;
fig. 5 is a flowchart of a second mode-one switching control according to the embodiment of the present invention;
fig. 6 is a flowchart of a first mode-two handover control according to the embodiment of the present invention;
fig. 7 is a flowchart of a second mode-two handover control according to the embodiment of the present invention;
fig. 8 is a schematic structural diagram of a first source access network node according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a first target access network node according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a second source access network node according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a second target access network node according to an embodiment of the present invention.
Detailed Description
Hereinafter, some terms in the embodiments of the present application are explained to facilitate understanding by those skilled in the art.
(1) In the embodiments of the present application, the terms "network" and "system" are often used interchangeably, but those skilled in the art can understand the meaning.
(2) In the embodiments of the present application, the term "plurality" means two or more, and other terms are similar thereto.
(3) "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The network architecture and the service scenario described in the embodiment of the present invention are for more clearly illustrating the technical solution of the embodiment of the present invention, and do not form a limitation on the technical solution provided in the embodiment of the present invention, and it can be known by those skilled in the art that the technical solution provided in the embodiment of the present invention is also applicable to similar technical problems along with the evolution of the network architecture and the appearance of a new service scenario.
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 2 illustrates a schematic diagram of a system architecture suitable for an embodiment of the present invention, and as shown in fig. 2, in a future 5G system architecture, a terminal 101 may communicate with a core network via an access network entity 102, and the terminal may refer to a UE, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with Wireless communication capabilities, a computing device or other processing device connected to a Wireless modem, a vehicle mounted device, a wearable device, a terminal in a future 5G network, etc. For convenience of description, fig. 2 only illustrates 1 terminal, and in an actual network, multiple terminals may coexist, which is not described herein again.
AN Access Network (AN) entity 102, which may also be referred to as a Radio Access Network (R) entity, hereinafter referred to as AN Access Network entity (R) AN entity, is mainly responsible for providing a wireless connection for the terminal 101, and ensuring reliable transmission of uplink and downlink data of the terminal 101. The Access network entity 102 may be a next generation Base Station (gNB) in a 5G System, which may be a Base Transceiver Station (BTS) in a Global System for mobile communications (GSM) System or a Code Division Multiple Access (CDMA) System, a Base Station (NodeB, NB) in a Wideband Code Division Multiple Access (WCDMA) System, an evolved Base Station (eNB or eNodeB) in a Long Term Evolution (LTE) System, or the like.
A Session Management Function Entity (SMF) 103, which may be configured to perform a part of functions of a Mobility Management Entity (MME) in the LTE system, and is mainly responsible for establishing a Session, managing the Session, and the like for the terminal 101. A suitable User Plane Function (UPF) entity may be selected for the terminal 101 according to the location information of the terminal 101.
The user plane functional entity 104 is a functional network element of the user plane of the terminal 101, and has main functions including packet routing and forwarding, Quality of Service (QoS) processing of user plane data, and the like.
An Access and Mobility Management Function (AMF) 105 has the main functions of a terminal node of a radio Access network control plane, a terminal node of a non-Access signaling, Mobility Management, lawful interception, Access authorization or authentication, and the like.
A Policy Control Function (PCF) entity 106 is mainly responsible for the functions of establishing, releasing, and changing the transmission path of the user plane.
The service function entity 107 is authenticated, and its main functions include user authentication and the like.
The unified data management functional entity 108 is mainly responsible for managing subscription data of the user and the like.
The Data Network (DN) 109 may refer to a Network providing services for the terminal 101, for example, some DNs may provide an internet function for the terminal 101, and some DNs may provide a multimedia message function for the terminal 101.
It should be noted that the above system architecture is only an example of the system architecture applicable to the embodiment of the present invention, and the system architecture applicable to the embodiment of the present invention may also add other entities or reduce part of the entities compared to the system architecture shown in fig. 2.
The embodiment of the invention is applied to a shared network scene, and specifically, different operators can share one access network resource or different operators share a core network resource. And different operators use different PLMN IDs for differentiation in the same access or core network.
After a source access network node to which the UE is currently accessed determines that the UE needs to be switched from the source access network node to a target access network node, if the target access network node is a shared network, that is, the target access network node is shared by multiple operators. Then, the source access network node needs to determine the PLMN used by the UE in the access network after the handover, and when the PLMN used by the UE does not change, the handover procedure in the prior art is used for the handover.
If the scheme for switching between access network nodes in the prior art is still adopted after the change of the used PLMN before and after the UE is switched, the AMF entity accessed by the UE before and after the UE is switched does not change, the UE still uses the AMF entity accessed before the UE is switched to the target access network node, and the PLMN used by the UE before and after the UE is switched changes, but the AMF entity cannot be changed by the scheme in the prior art, so that the cross-PLMN switching cannot be completed correctly.
In view of the above problem, an embodiment of the present invention provides a handover control method, as shown in fig. 3.
In step 301, first, a source access network node determines that a UE needs to be switched to a target access network node;
specifically, the triggering condition of the handover process may be a radio signal condition, load balancing, or other special services.
In the embodiment of the present invention, a target access network node accessed after the UE is switched is a shared network, and the target access network node is shared by multiple operators, that is, the target access network corresponds to multiple PLMNs. And the source access network node determines a target PLMN used after the UE is switched to the target access network node.
After the source access network node determines the target PLMN, the source access network node determines that the PLMN changes when the target PLMN is determined to be different from the PLMN currently used by the UE.
When the source access network node determines that the target access network node corresponds to the multiple PLMNs, one of the multiple PLMNs is selected as the target PLMN used after the UE is switched to the target access network node.
It should be noted here that, when one access network node corresponds to multiple PLMNs, PLMN IDs are used to distinguish different PLMNs; after the source access network node determines the target PLMN, whether the PLMN ID of the target PLMN is the same as the PLMN ID of the currently used PLMN is judged. Judging whether the PLMN used by the UE after being switched to the target access network node changes; and when the PLMN ID of the target PLMN is different from the PLMN ID of the currently used PLMN, the source access network node determines that the PLMN used by the UE after being switched to the target access network node is changed.
An interface connection exists between the source access network node and the target access network node; the source access network node and the target access network node are capable of communicating over an interface therebetween.
Optionally, an interface between the source access network node and the target access network node is an Xn interface.
After determining that the PLMN used by the UE after being switched to the target access network node changes, the source access network node judges whether Xn switching can be carried out or not; when Xn switching can be carried out, the source access network node initiates the Xn switching; otherwise, the source access network node initiates an N2 handover.
Among them, Xn handover and N2 handover may refer to the description in 3GPP TS 23.502.
It should be noted that, in the embodiment of the present invention, the procedure for initiating the Xn handover by the source access network node may refer to an Xn handover procedure in the prior art, and the procedure for initiating the N2 handover by the source access network node may also refer to an N2 handover procedure in the prior art, which is not described in detail herein.
Optionally, in the embodiment of the present invention, the source access network node determines whether Xn handover can be performed according to the following manner:
in the first mode, a source access network node determines that Xn switching can be performed after determining that an AMF entity of current service UE is connected with an NG interface of a target access network node in a target PLMN according to operation, Administration and maintenance (OAM) configuration information; or
And in the second mode, the source access network node receives the indication of the target access network node and judges whether Xn switching can be carried out or not.
The following describes the two modes separately.
And in the first mode, whether connection of an NG interface exists between an AMF entity serving the UE currently and a target access network node in a target PLMN is determined according to a source access network node, and whether Xn switching can be carried out is judged.
After determining a target PLMN used by the UE after being switched to the target access network node, the source access network node judges whether connection of an NG interface exists between an AMF entity serving the UE currently and the target access network node in the target PLMN or not according to the OAM configuration information;
after determining that the connection of the NG interface exists between the AMF entity serving the UE currently and the target access network node in the target PLMN, the source access network node determines that Xn switching can be performed.
Optionally, in the embodiment of the present invention, the connection between the AMF entity currently serving the UE and the NG interface of the target access network node in the target PLMN is determined according to the following manner:
and after the source access network node determines that the target PLMN and the PLMN currently accessed by the UE are equivalent PLMNs or support core network sharing according to OAM configuration information, determining that the AMF entity currently serving the UE is connected with the NG interface of the target access network node in the target PLMN.
When there is a connection of an NG interface between the AMF entity currently serving the UE and the target access network node in the target PLMN, even if the UE is switched from the source access network node to the target access network node, the AMF entity currently serving the UE can still continue to serve the UE, so that the UE only needs to be switched from the source access network node to the target access network node, that is, the source access network node initiates an Xn switching procedure.
And when determining that no connection of an NG interface exists between the AMF entity currently serving the UE and the target access network node in the target PLMN, the source access network node initiates an N2 handover process.
Because there is no connection of the NG interface between the AMF entity currently serving the UE and the target access network node in the target PLMN, after the UE is switched from the source access network node to the target access network node, the AMF entity currently serving the UE cannot continue to serve the UE, so the AMF entity serving the UE also needs to change, and the source access network node needs to initiate an N2 switching procedure.
With reference to fig. 4, a first flow of performing handover control in a first mode according to the embodiment of the present invention is described.
Step 401, a source access network node determines that UE needs to be switched to a target access network node;
the target access network node is a shared network.
Step 402, the source access network node determines a target PLMN used after the UE is handed over to the target access network node.
Step 403, the source access network node determines that the PLMN used by the UE changes.
And step 404, the source access network node determines that the target PLMN and the PLMN currently accessed by the UE are equivalent PLMNs or support core network sharing according to the OAM configuration information.
Step 405, the source access network node determines that there is a connection of NG interface between the AMF entity currently serving the UE and the target access network node in the target PLMN.
Step 406, the source access network node initiates Xn handover.
With reference to fig. 5, a flow of performing handover control in a second mode of the first embodiment of the present invention is described.
Step 501, a source access network node determines that UE needs to be switched to a target access network node;
the target access network node is a shared network.
Step 502, the source access network node determines a target PLMN used after the UE is handed over to the target access network node.
Step 503, the source access network node determines that the PLMN used by the UE changes.
Step 504, the source access network node determines that the target PLMN and the PLMN currently accessed by the UE are not equivalent PLMNs to each other according to the OAM configuration information, and the target PLMN UE and the PLMN currently accessed by the UE do not support core network sharing.
Step 505, the source access network node determines that there is no connection of NG interface between the AMF entity currently serving the UE and the target access network node in the target PLMN.
Step 506, the source access network node initiates an N2 handover.
And judging whether Xn switching can be carried out or not according to the received indication of the target access network node.
The source access network node determines that the UE needs to be handed over to the target access network node and determines the target PLMN for access.
The source access network node sends a switching request message to the target access network node;
wherein, the handover request message includes the target PLMN identity and the AMF information of the current serving UE.
Optionally, the AMF information is a Globally Unique AMF Identifier (globalley Unique AMF Identifier, GUAMI);
and the source access network node sends a switching request message to the target access network node through the Xn interface.
Correspondingly, after receiving the switching request message, the target access network node judges whether Xn switching can be carried out according to the target PLMN identification and the AMF information; and after determining that the Xn switching can be carried out, returning a switching success indication to the source access network node, otherwise, returning a switching failure indication to the source access network node.
Specifically, the target access network node judges whether Xn handover can be performed according to the following two ways:
1. the target access network node judges whether the target access network node can establish connection with the AMF entity according to the target PLMN identification and the AMF information; and when the target access network node can establish connection with the AMF entity, determining that Xn handover can be carried out.
2. The target access network node determines an AMF information list capable of serving the UE in the target PLMN according to the target PLMN identification; determining that Xn handover is possible when the AMF information is in the AMF information list;
the AMF information is information of an AMF entity currently serving the UE, and the AMF information list is a list of information of AMF entities capable of serving the UE in the target PLMN.
After determining that Xn switching can be performed, the target access network node returns an indication of successful switching to the source access network node; after receiving the indication of successful switching, the source target access network node initiates Xn switching;
after determining that Xn switching cannot be performed, the target access network node returns a switching failure indication to the source access network node; the source target access network node initiates an N2 handover after receiving the indication of handover failure.
Because the target access network node can establish connection with the AMF entity currently serving the UE, or the AMF entity currently serving the UE can still serve the UE in the target PLMN, even if the UE is switched from the source access network node to the target access network node, the AMF entity currently serving the UE can still continue to serve the UE, so that the UE only needs to be switched from the source access network node to the target access network node, namely the source access network node initiates an Xn switching process; on the contrary, after the UE is switched from the source access network node to the target access network node, the AMF entity currently serving the UE cannot continuously provide services for the UE in the target PLMN, so that after the UE is switched to the target access network node, the AMF entity serving the UE also changes, and the source access network node needs to initiate an N2 switching process.
With reference to fig. 6, a flow of performing handover control in the first mode of adoption two according to the embodiment of the present invention is described.
601, a source access network node determines that UE needs to be switched to a target access network node;
the target access network node is a shared network.
Step 602, the source access network node determines a target PLMN used after the UE is handed over to the target access network node.
Step 603, the source access network node sends a switching request message to the target access network node;
wherein, the handover request includes the target PLMN identity and the AMF information of the current serving UE.
Step 604, the target access network node determines that Xn handover can be performed according to the target PLMN identification and the AMF information;
specifically, the target access network node determines that a connection can be established with an AMF entity of the current serving UE, or the target access network node determines that the AMF information list of the UE capable of being served in the target PLMN includes the AMF information of the current serving UE according to the target PLMN identifier, and then the target access network node determines that Xn handover can be performed.
Step 605, the target access network node returns an indication of successful handover to the source access network node.
Step 606, the source access network node initiates Xn handover.
With reference to fig. 7, a flow of performing handover control in the second mode of implementation of the second embodiment of the present invention is described.
Step 701, a source access network node determines that UE needs to be switched to a target access network node;
the target access network node is a shared network.
Step 702, the source access network node determines a target PLMN used after the UE is handed over to the target access network node.
Step 703, the source access network node sends a switching request message to the target access network node;
wherein, the handover request includes the target PLMN identity and the AMF information of the current serving UE.
Step 704, the target access network node determines not to perform Xn handover according to the target PLMN identification and the AMF information;
specifically, the target access network node determines that the connection with the AMF entity of the current serving UE cannot be established, and the target access network node determines that the AMF information list capable of serving the UE in the target PLMN does not include the AMF information of the current serving UE according to the target PLMN identifier, so that the target access network node determines that the Xn handover cannot be performed.
Step 705, the target access network node returns an indication of the handover failure to the source access network node.
Step 706, the source access network node initiates an N2 handover.
Based on the same inventive concept, the embodiment of the present invention provides a source access network node, and since the device corresponds to the handover control method in the embodiment of the present invention, and the principle of the device for solving the problem is similar to that of the method, the implementation of the device may refer to the implementation of the method, and repeated details are not repeated.
As shown in fig. 8, a first source access network node according to the embodiment of the present invention includes: a processor 800, a memory 801, a transceiver 802, and a bus interface.
The processor 800 is responsible for managing the bus architecture and general processing, and the memory 801 may store data used by the processor 800 in performing operations. The transceiver 803 is used for receiving and transmitting data under the control of the processor 800.
The bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 800 and various circuits of memory represented by memory 801 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 800 is responsible for managing the bus architecture and general processing, and the memory 801 may store data used by the processor 800 in performing operations.
The processes disclosed in the embodiments of the present invention may be applied to processor 800, or implemented by processor 800. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 800. The processor 800 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 801, and the processor 800 reads the information in the memory 801 and completes the steps of the signal processing flow in combination with the hardware thereof.
Specifically, the processor 800 is configured to read the program in the memory 801 and execute:
determining a target access network node and a target PLMN;
determining that the PLMN changes and the Xn interface connection exists between the PLMN and the target access network node;
judging whether Xn switching can be carried out or not, if yes, carrying out Xn switching, and otherwise, initiating N2 switching.
Optionally, the processor 800 is specifically configured to:
determining that Xn switching can be performed after determining that an NG interface exists between an AMF entity of the current service UE and a target access network node in a target PLMN according to OAM configuration information; or
And receiving the indication of the target access network node, and judging whether Xn switching can be carried out or not.
Optionally, the processor 800 is specifically configured to:
and after determining that the target PLMN and the PLMN currently accessed by the UE are equivalent PLMNs or support core network sharing according to OAM configuration information, determining that the AMF entity currently serving the UE is connected with a target access network node in the target PLMN through an NG interface.
Optionally, the processor 800 is further configured to:
and before receiving the indication of the target access network node, sending a switching request message containing a target PLMN identification and AMF information of the current service UE to the target access network node, so that the target access network node returns an indication of successful switching when determining that Xn switching can be carried out according to the target PLMN identification and the AMF information, otherwise, returns an indication of failed switching.
Optionally, the processor 800 is specifically configured to:
and when receiving the indication of successful switching returned by the target access network node, determining that the Xn switching can be carried out.
Optionally, the AMF information is GUAMI.
As shown in fig. 9, a first target access network node according to an embodiment of the present invention includes a processor 900, a memory 901, a transceiver 902, and a bus interface.
The processor 900 is responsible for managing the bus architecture and general processing, and the memory 901 may store data used by the processor 900 in performing operations. The transceiver 903 is used to receive and transmit data under the control of the processor 900.
The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by processor 900, and various circuits, represented by memory 901, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 900 is responsible for managing the bus architecture and general processing, and the memory 901 may store data used by the processor 900 in performing operations.
The processes disclosed in the embodiments of the present invention may be applied to the processor 900, or implemented by the processor 900. In implementation, the steps of the signal processing flow may be performed by integrated logic circuits of hardware or instructions in the form of software in the processor 900. The processor 900 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 901, and the processor 900 reads the information in the memory 901 and completes the steps of the signal processing flow in combination with the hardware thereof.
Specifically, the processor 900 is configured to read a program in the memory 901 and execute:
receiving a switching request message which contains a target PLMN identification and AMF information of current service UE and is sent by a source access network node; the switching request message is sent after the source access network node determines that the PLMN changes and has Xn interface connection with the target access network node;
judging whether Xn switching can be carried out or not according to the target PLMN identification and the AMF information;
and after determining that the Xn switching can be carried out, returning a switching success indication to the source access network node, otherwise, returning a switching failure indication to the source access network node.
Optionally, the processor 900 is specifically configured to:
judging whether the target access network node can establish connection with the AMF or not according to the target PLMN identification and the AMF information; determining that an Xn handover is possible when a connection with the AMF entity can be established.
Optionally, the processor 900 is specifically configured to:
determining an AMF information list capable of serving the UE in the target PLMN according to the target PLMN identification; determining that an Xn handover is possible when the AMF information is in the AMF information list.
As shown in fig. 10, a second source access network node according to the embodiment of the present invention includes:
a first determining module 1001 for determining a target access network node and a target PLMN;
a second determining module 1002, configured to determine that a PLMN changes and an Xn interface exists between the target access network node and the PLMN;
the processing module 1003 is configured to determine whether Xn handover is possible, perform Xn handover if Xn handover is possible, and initiate N2 handover if Xn handover is not possible.
Optionally, the processing module 1003 is specifically configured to:
determining that Xn switching can be performed after determining that an NG interface exists between an AMF entity of the current service UE and a target access network node in a target PLMN according to OAM configuration information; or
And receiving the indication of the target access network node, and judging whether Xn switching can be carried out or not.
Optionally, the processing module 1003 is specifically configured to:
and after determining that the target PLMN and the PLMN currently accessed by the UE are equivalent PLMNs or support core network sharing according to OAM configuration information, determining that the AMF entity currently serving the UE is connected with a target access network node in the target PLMN through an NG interface.
Optionally, the processing module 1003 is further configured to:
and before receiving the indication of the target access network node, sending a switching request message containing a target PLMN identification and AMF information of the current service UE to the target access network node, so that the target access network node returns an indication of successful switching when determining that Xn switching can be carried out according to the target PLMN identification and the AMF information, otherwise, returns an indication of failed switching.
Optionally, the processing module 1003 is specifically configured to:
and when receiving the indication of successful switching returned by the target access network node, determining that the Xn switching can be carried out.
Optionally, the AMF information is GUAMI.
As shown in fig. 11, a second target access network node according to the embodiment of the present invention includes:
a receiving module 1101, configured to receive a handover request message sent by a source access network node and including a target PLMN identity and AMF information of a currently serving UE; the switching request message is sent after the source access network node determines that the PLMN changes and has Xn interface connection with the target access network node;
a determining module 1102, configured to determine whether Xn handover can be performed according to the target PLMN identifier and the AMF information;
a sending module 1103, configured to return an instruction of successful handover to the source access network node after determining that Xn handover is possible, and otherwise return an instruction of failed handover to the source access network node.
Optionally, the determining module 1102 is specifically configured to:
judging whether the target access network node can establish connection with the AMF or not according to the target PLMN identification and the AMF information; determining that an Xn handover is possible when a connection with the AMF entity can be established.
Optionally, the determining module 1102 is specifically configured to:
determining an AMF information list capable of serving the UE in the target PLMN according to the target PLMN identification; determining that an Xn handover is possible when the AMF information is in the AMF information list.
Embodiments of the present invention provide a computer-readable medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the above-mentioned source access network node-side handover control method, or implements the steps of the above-mentioned target access network node-side handover control method.
The present application is described above with reference to block diagrams and/or flowchart illustrations of methods, apparatus (systems) and/or computer program products according to embodiments of the application. It will be understood that one block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, and/or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer and/or other programmable data processing apparatus, create means for implementing the functions/acts specified in the block diagrams and/or flowchart block or blocks.
Accordingly, the subject application may also be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.). Furthermore, the present application may take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (21)
1. A handover control method, comprising:
a source access network node determines a target access network node and a target Public Land Mobile Network (PLMN);
the source access network node determines that the PLMN changes and the Xn interface connection exists between the source access network node and the target access network node;
and the source access network node judges whether Xn switching can be carried out or not, if the Xn switching can be carried out, the Xn switching is carried out, otherwise, the N2 switching is initiated.
2. The method of claim 1, wherein the determining by the source access network node whether Xn handover is possible comprises:
the source access network node determines that Xn switching can be performed after determining that connection of an NG interface exists between an access and mobility management function (AMF) entity of current service UE and a target access network node in a target PLMN according to OAM configuration information; or
And the source access network node receives the indication of the target access network node and judges whether Xn switching can be carried out or not.
3. The method of claim 2, wherein the source access network node determining that the connection of the NG interface exists between the AMF entity currently serving the UE and the target access network node in the target PLMN according to the following:
and after the source access network node determines that the target PLMN and the PLMN currently accessed by the UE are equivalent PLMNs or support core network sharing according to OAM configuration information, determining that the AMF entity currently serving the UE is connected with the NG interface of the target access network node in the target PLMN.
4. The method of claim 2, wherein prior to the source access network node receiving the indication of the target access network node, further comprising:
and the source access network node sends a switching request message containing a target PLMN identification and AMF information of the current service UE to the target access network node, so that the target access network node returns an indication of successful switching when determining that Xn switching can be carried out according to the target PLMN identification and the AMF information, otherwise returns an indication of failed switching.
5. The method of claim 4, wherein the source access network node receiving the indication of the target access network node and determining whether Xn handover is possible comprises:
and when receiving the indication of successful switching returned by the target access network node, the source access network node determines that the Xn switching can be carried out.
6. The method of claim 4, wherein the AMF information is a globally unique AMF identification (GUAMI).
7. A handover control method, comprising:
a target access network node receives a switching request message which contains a target PLMN identification and AMF information of current service UE and is sent by a source access network node; the switching request message is sent after the source access network node determines that the PLMN changes and has Xn interface connection with the target access network node;
the target access network node judges whether Xn switching can be carried out or not according to the target PLMN identification and the AMF information;
and after determining that the Xn switching can be carried out, the target access network node returns a switching success indication to the source access network node, otherwise, a switching failure indication is returned to the source access network node.
8. The method of claim 7, wherein the determining, by the target access network node, whether Xn handover is possible according to the target PLMN identity and the AMF information comprises:
the target access network node judges whether the target access network node can establish connection with the AMF or not according to the target PLMN identification and the AMF information;
and when the connection with the AMF entity can be established, the target access network node determines that the Xn handover can be carried out.
9. The method of claim 7, wherein the target access network node determining whether an Xn handover is possible based on the target PLMN identity and the AMF information comprises:
the target access network node determines an AMF information list capable of serving the UE in the target PLMN according to the target PLMN identification;
and when the AMF information is in the AMF information list, the target access network node determines that Xn handover can be carried out.
10. A source access network node comprising a processor, a memory, and a transceiver;
wherein the processor is configured to read a program in the memory and execute:
determining a target access network node and a target PLMN;
determining that the PLMN changes and the Xn interface connection exists between the PLMN and the target access network node;
judging whether Xn switching can be carried out or not, if yes, carrying out Xn switching, and otherwise, initiating N2 switching.
11. The source access network node of claim 10, wherein the processor is specifically configured to:
determining that Xn switching can be performed after determining that an NG interface exists between an AMF entity of the current service UE and a target access network node in a target PLMN according to OAM configuration information; or
And receiving the indication of the target access network node, and judging whether Xn switching can be carried out or not.
12. The source access network node of claim 11, wherein the processor is specifically configured to:
and after determining that the target PLMN and the PLMN currently accessed by the UE are equivalent PLMNs or support core network sharing according to OAM configuration information, determining that the AMF entity currently serving the UE is connected with a target access network node in the target PLMN through an NG interface.
13. The source access network node of claim 11, wherein the processor is further configured to:
and before receiving the indication of the target access network node, sending a switching request message containing a target PLMN identification and AMF information of the current service UE to the target access network node, so that the target access network node returns an indication of successful switching when determining that Xn switching can be carried out according to the target PLMN identification and the AMF information, otherwise, returns an indication of failed switching.
14. The source access network node of claim 13, wherein the processor is specifically configured to:
and when receiving the indication of successful switching returned by the target access network node, determining that the Xn switching can be carried out.
15. The source access network node in claim 13, wherein the AMF information is a globally unique AMF identification, GUAMI.
16. A target access network node comprising a processor, a memory, and a transceiver;
wherein the processor is configured to read a program in the memory and execute:
receiving a switching request message which contains a target PLMN identification and AMF information of current service UE and is sent by a source access network node; the switching request message is sent after the source access network node determines that the PLMN changes and has Xn interface connection with the target access network node;
judging whether Xn switching can be carried out or not according to the target PLMN identification and the AMF information;
and after determining that the Xn switching can be carried out, returning a switching success indication to the source access network node, otherwise, returning a switching failure indication to the source access network node.
17. The target access network node of claim 16, wherein the processor is specifically configured to:
judging whether the target access network node can establish connection with the AMF or not according to the target PLMN identification and the AMF information; determining that an Xn handover is possible when a connection with the AMF entity can be established.
18. The target access network node of claim 16, wherein the processor is specifically configured to:
determining an AMF information list capable of serving the UE in the target PLMN according to the target PLMN identification; determining that an Xn handover is possible when the AMF information is in the AMF information list.
19. A source access network node, comprising:
a first determining module, configured to determine a target access network node and a target PLMN;
a second determining module, configured to determine that a PLMN changes and an Xn interface connection exists between the target access network node and the PLMN;
and the processing module is used for judging whether Xn switching can be carried out, if the Xn switching can be carried out, the Xn switching is carried out, otherwise, the N2 switching is initiated.
20. A target access network node, comprising:
a receiving module, configured to receive a handover request message sent by a source access network node and including a target PLMN identity and AMF information of a currently serving UE; the switching request message is sent after the source access network node determines that the PLMN changes and has Xn interface connection with the target access network node;
the judging module is used for judging whether Xn switching can be carried out or not according to the target PLMN identification and the AMF information;
and the sending module is used for returning a switching success indication to the source access network node after determining that the Xn switching can be carried out, and otherwise, returning a switching failure indication to the source access network node.
21. A computer-readable medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 6 or carries out the steps of the method according to any one of claims 7 to 9.
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