CN116456411A - Base station switching method, access network, network element, device and storage medium - Google Patents

Base station switching method, access network, network element, device and storage medium Download PDF

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Publication number
CN116456411A
CN116456411A CN202310521764.4A CN202310521764A CN116456411A CN 116456411 A CN116456411 A CN 116456411A CN 202310521764 A CN202310521764 A CN 202310521764A CN 116456411 A CN116456411 A CN 116456411A
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China
Prior art keywords
base station
network element
functional network
user equipment
station functional
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CN202310521764.4A
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Inventor
刘玉芹
何宇锋
林奕琳
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Guangdong Research Institute China Telecom Co ltd
China Telecom Corp Ltd
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Guangdong Research Institute China Telecom Co ltd
China Telecom Corp Ltd
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Priority to CN202310521764.4A priority Critical patent/CN116456411A/en
Publication of CN116456411A publication Critical patent/CN116456411A/en
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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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point

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

Abstract

The present disclosure relates to the field of communication technologies, and relates to a base station switching method, an access network, a base station functional network element, a communication device, and a storage medium. The base station switching method comprises the following steps: the target base station functional network element receives a switching request of the source base station functional network element, sends a user equipment position updating request message to the mobility management function, and the switching request is used for requesting user equipment connected with the source base station functional network element to be switched from the source base station functional network element to the target base station functional network element; transmitting a PDU session update request message to a connection control function, the connection control function being determined based on a PDU session context of the user equipment; and receiving a user equipment position updating response message sent by the mobility management function and a PDU session updating response message sent by the connection control function, and sending a resource release message to the source base station functional network element to instruct the source base station functional network element to release resources associated with the user equipment. The method and the device can improve the interaction efficiency of the wireless network and the core network and reduce the signaling delay.

Description

Base station switching method, access network, network element, device and storage medium
Technical Field
The present disclosure relates to the field of communication technologies, and more particularly, to a base station handover method, an access network, a base station function network element, a communication apparatus, and a computer readable storage medium.
Background
With the development of the communication technology field, the future 6G network shows a distributed trend, and the core network functions are deployed in a sinking manner, and even the core network functions and the wireless network are deployed at the same position. However, the existing interaction mode of the wireless network and the core network of 5G belongs to a centralized interaction mode, and the interaction process depends on a centralized node (such as AMF (Access and Mobility Management Function, access and mobility management function)), so that unnecessary forwarding exists in the network, signaling delay is increased, and interaction efficiency of the wireless network and the core network is reduced.
It should be noted that the information of the present invention in the above background section is only for enhancing understanding of the background of the present disclosure, and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure aims to provide a base station switching method, an access network, a base station functional network element, a communication device and a computer readable storage medium, so as to improve interaction efficiency of a wireless network and a core network and reduce signaling delay.
Other features and advantages of the present disclosure will be apparent from the following detailed description, or may be learned in part by the practice of the disclosure.
According to one aspect of the present disclosure, there is provided a base station handover method, including:
the method comprises the steps that a target base station functional network element receives a switching request of a source base station functional network element, and sends a user equipment position updating request message to a mobility management function, wherein the switching request is used for requesting user equipment connected with the source base station functional network element to be switched from the source base station functional network element to the target base station functional network element; transmitting a protocol data unit, PDU, session update request message to a connection control function, the connection control function being determined based on a PDU session context of the user equipment; and receiving a user equipment position updating response message sent by the mobility management function and receiving a PDU session updating response message sent by the connection control function, and sending a resource release message to the source base station functional network element so as to instruct the source base station functional network element to release the resources associated with the user equipment.
In an exemplary embodiment of the present disclosure, before the sending of the user equipment location update request message to the mobility management function, the method further comprises: receiving a PDU session context of the user equipment sent by the source base station functional network element, wherein the PDU session context of the user equipment carries a connection control function identifier; determining the connection control function based on the PDU session context of the user equipment, comprising: and acquiring the connection control function corresponding to the user equipment according to the connection control function identifier.
In an exemplary embodiment of the present disclosure, the PDU session update response message is sent after the connection control function receives a session modification response sent by a user plane function; the session modification response is sent after the user plane function receives a session modification request sent by the connection control function, and the session modification request is sent after the connection control function determines that the user plane function has the capability of serving the user equipment; the session modification request is used for requesting the user plane function to switch a user plane function path to the target base station function network element.
In an exemplary embodiment of the present disclosure, the method further comprises: the target base station functional network element receives a data packet which is sent by the source base station functional network element and carries an end mark, wherein the end mark is used for indicating the end of a data stream to the source base station functional network element; and the data packet carrying the end mark is sent to the source base station function network element after the user plane function sends the session modification response to the connection control function.
In one exemplary embodiment of the present disclosure, if the PDU session update response message indicates that the PDU session update is successful, the PDU session update response message includes a switched PDU session list and a PDU session list of handover failure.
According to one aspect of the present disclosure, there is provided an access network, the access network including a source base station functional network element, a user equipment connected with the source base station functional network element, and a target base station functional network element, the target base station functional network element being a base station functional network element to which the user equipment is switched by the source base station functional network element; the target base station functional network element is configured to: receiving a switching request of a source base station functional network element, and sending a user equipment position updating request message to a mobility management function, wherein the switching request is used for requesting user equipment connected with the source base station functional network element to be switched from the source base station functional network element to the target base station functional network element; transmitting a protocol data unit, PDU, session update request message to a connection control function, the connection control function being determined based on a PDU session context of the user equipment; and receiving a user equipment position updating response message sent by the mobility management function and receiving a PDU session updating response message sent by the connection control function, and sending a resource release message to the source base station functional network element so as to instruct the source base station functional network element to release the resources associated with the user equipment.
In an exemplary embodiment of the present disclosure, the target base station functional network element is further configured to: receiving a PDU session context of the user equipment sent by the source base station functional network element, wherein the PDU session context of the user equipment carries a connection control function identifier; and acquiring the connection control function corresponding to the user equipment according to the connection control function identifier.
According to an aspect of the present disclosure, there is provided a base station functional network element, which is a network element for implementing a base station function, the base station functional network element including: a first processing module, configured to receive a handover request of a source base station functional network element, and send a user equipment location update request message to a mobility management function, where the handover request is used to request a user equipment connected to the source base station functional network element to be handed over from the source base station functional network element to the base station functional network element; a determining module, configured to determine a connection control function corresponding to the user equipment based on a PDU session context of the user equipment; a second processing module, configured to send a protocol data unit PDU session update request message to the connection control function; and the third processing module is used for receiving the user equipment position updating response message sent by the mobility management function and receiving the PDU session updating response message sent by the connection control function, and sending a resource release message to the source base station functional network element so as to instruct the source base station functional network element to release the resources associated with the user equipment.
According to one aspect of the present disclosure, there is provided a communication apparatus including: a processor and a memory; the memory stores instructions executable by the processor; the processor is configured to, when executing the instructions, cause the communication device to implement the base station handover method of any one of the above.
According to an aspect of the present disclosure, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the base station handover method of any one of the above.
According to the base station switching method in the exemplary embodiment of the disclosure, a target base station functional network element receives a switching request of a source base station functional network element, sends a user equipment location update request message to a mobility management function, the switching request is used for requesting user equipment connected with the source base station functional network element to switch from the source base station functional network element to the target base station functional network element, and sends a protocol data unit PDU session update request message to a connection control function, wherein the connection control function is determined based on PDU session context of the user equipment, receives a user equipment location update response message sent by the mobility management function and a PDU session update response message sent by the connection control function, and sends a resource release message to the source base station functional network element to instruct the source base station functional network element to release resources associated with the user equipment.
On the one hand, in the process of switching the user equipment from the source base station functional network element to the target base station functional network element, the target base station functional network element can directly interact with the network function in the core network, can send a UE position update request message to the mobility management function in parallel, send a PDU session update request message to the connection control function, and receive a UE position update response message sent by the mobility management function and a PDU session update response message sent by the connection control function, so as to trigger the source base station to release resources associated with the UE, complete the base station switching, reduce the forwarding process of unnecessary concentrated nodes in the network, save the processing capacity of the network function in the core network, improve the interaction efficiency of the wireless network and the core network and reduce the signaling delay; on the other hand, compared with a control mode adopting centralized node forwarding, the control method is not easy to become a performance and safety bottleneck, and improves the reliability and interaction flexibility of the network.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present disclosure will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present disclosure are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings, in which:
Fig. 1 shows a flow chart of a current base station handoff in the art;
fig. 2 illustrates a flow chart of a base station handover method according to an exemplary embodiment of the present disclosure;
FIG. 3 illustrates a system architecture diagram according to an exemplary embodiment of the present disclosure;
fig. 4 illustrates an interaction diagram of a base station handover method according to an exemplary embodiment of the present disclosure;
fig. 5 shows a schematic diagram of an access network according to an exemplary embodiment of the present disclosure;
fig. 6 shows a schematic diagram of a base station functional network element according to an exemplary embodiment of the present disclosure;
fig. 7 shows a schematic diagram of a communication device according to an exemplary embodiment of the present disclosure.
In the drawings, the same or corresponding reference numerals indicate the same or corresponding parts.
Detailed Description
Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the disclosed aspects may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known structures, methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.
Fig. 1 shows a flow chart of a current base station handover in the art, in which the basic functional modules involved include, but are not limited to:
And the terminal (UE) mainly accesses the network and obtains service through a next generation wireless air interface, and the terminal exchanges information with the base station through the air interface and exchanges information with the public control plane function and the session control plane function of the core network through non-access layer signaling. Terminals, which may also be referred to as user terminals, user equipment, mobile devices, mobile terminals, etc., are not particularly limited in this disclosure.
The next generation base stations (NR RAN, radio Access Network, gNB), NR base stations, are responsible for air interface resource scheduling and air interface connection management for the terminal access network.
Session control plane control functions (SMF, session Management Function), i.e. session management functions, interact with the terminals and are responsible for handling user Protocol Data Unit (PDU) session establishment, modification and deletion requests, selecting UPF (User Plane Function, user plane functions), establishing user plane connections between UE to UPF and determining quality of service parameters of the session together with PCF (Policy Control Function ), etc.
Access and mobility control functions (AMF, access and Mobility Management Function), common control plane functions within the core network.
The user plane function UPF provides user handling functions.
The base station handover procedure based on the above basic functional module may include:
step S110, executing a switching preparation and switching execution stage; step 120, the target base station sends a path switching request message to the AMF; step S130 to step S180, the AMF updates the related PDU session information by the SMF, including but not limited to reestablishing the N3 connection between the RAN (Radio Access Network ) and the UPF; step S190 and step S200, the AMF responds to the path switching request and triggers the source base station side to release the UE related resources.
In the above base station switching process, the interaction between the base station and the control plane of the core network needs to be forwarded by a unified centralized node (such as AMF), but the wireless network cannot directly communicate with other functions of the core network, so that the centralized node wastes a great deal of processing capacity.
Based on one or more problems caused by the centralized interaction between the wireless network and the core network in the related art, in an exemplary embodiment of the present disclosure, a base station handover method is first provided. The base station switching method is applied to a target base station functional network element in a wireless network, wherein the target base station functional network element is a network element for realizing a base station function and is a base station functional network element to which user equipment is switched by a source base station functional network element.
The overall base station handover procedure generally mainly includes a handover preparation phase, a handover execution phase and a handover completion phase. In the handover preparation stage, the source base station functional network element may decide to handover the UE to the selected target base station functional network element according to the measurement report and other information (such as cell load, terminal mobility limitation and wireless capability) sent by the UE, and send an Xn AP handover request message to the target base station functional network element through a relevant interface (such as an Xn interface) by the source base station functional network element, and if the target base station functional network element determines to accept handover, send a handover request acknowledgement message to the source base station functional network element.
The base station handover method in the embodiment of the present disclosure starts from the target base station functional network element receiving the handover request of the source base station functional network element in the handover preparation stage, and the previous steps may be the same as the above process, and will not be repeated here.
Referring to fig. 2, the base station handover method according to the embodiment of the present disclosure may include steps S210 to S230:
step S210: the target base station functional network element receives a switching request of the source base station functional network element, sends a user equipment position updating request message to the mobility management function, and the switching request is used for requesting user equipment connected with the source base station functional network element to be switched from the source base station functional network element to the target base station functional network element;
Step S220: transmitting a protocol data unit PDU session update request message to a connection control function, the connection control function being determined based on a PDU session context of the user equipment;
step S230: and receiving a user equipment position updating response message sent by the mobility management function and a PDU session updating response message sent by the connection control function, and sending a resource release message to the source base station functional network element to instruct the source base station functional network element to release resources associated with the user equipment.
In the base station switching method of the embodiment of the disclosure, in the process of switching the user equipment from the source base station functional network element to the target base station functional network element, the target base station functional network element can directly interact with the network function in the core network, can send the UE position update request message to the mobility management function in parallel, send the PDU session update request message to the connection control function, and receive the UE position update response message sent by the mobility management function and the PDU session update response message sent by the connection control function, so as to trigger the source base station to release resources associated with the UE, complete the base station switching, reduce the forwarding process of unnecessary centralized nodes in the network, save the processing capability of the network function in the core network, improve the interaction efficiency of the wireless network and the core network, and reduce the signaling delay.
Compared with a control mode adopting centralized node forwarding, the embodiment of the disclosure is not easy to become a performance and safety bottleneck, and improves the reliability and interaction flexibility of the network.
It should be noted that, in the embodiment of the present disclosure, the execution sequence of the step S210 and the step S220 is not limited, and the step S210 may be executed first, and then the step S220 may be executed. Step S220 may also be performed first; step S210 and step S220 may also be performed simultaneously.
First, basic functional modules related to embodiments of the present disclosure will be described.
The target base station functional network element is used for realizing the base station function, and can also be the base station itself. The target base station functional network element in the embodiment of the present disclosure is a base station functional network element to which the user equipment is switched from the source base station.
The source base station function network element is also a network element for realizing the base station function, and can also be the base station itself. The source base station functional network element in the embodiment of the present disclosure is a base station functional network element to which the user equipment is currently connected.
Mobility management functions, which are common control plane functions within the core network, are responsible for handling mobility related functions including, but not limited to, location registration, temporary identity assignment, etc.
The connection control function is a function used for being responsible for the related control of communication connection in the core network.
User plane functions, providing user plane processing functions including, but not limited to, data forwarding, qoS (Quality of Service ) enforcement, and the like.
Fig. 3 illustrates a system architecture diagram including user equipment functions (UEs), base station function network elements, and other network functions (e.g., mobility management functions, connection control functions, user plane functions, etc. within the core network of embodiments of the present disclosure) according to embodiments of the present disclosure.
Referring to fig. 3, in the communication system, end-to-end service may be implemented among the UE function, the base station function network element, and other network functions, so as to reduce forwarding performed by a certain centralized node in the network, improve interaction efficiency of the wireless network and the core network, and reduce signaling delay.
The base station handover method according to the embodiment of the present disclosure is described in detail below with reference to fig. 2 and 3.
The UE location information and the identification information of the target base station functional network element are included in the UE location update request sent by the target base station functional network element to the mobility management function in step S210.
In an exemplary embodiment, before the handover preparation phase, i.e. before the target base station network element function sends the user equipment location update request message to the mobility management function, the method further comprises: and receiving the PDU session context of the user equipment sent by the source base station functional network element, wherein the PDU session context of the user equipment carries the connection control function identifier.
Based on this, in the handover execution phase, the target base station functional network element may acquire the connection control function corresponding to the user equipment based on the connection control function identifier.
In an exemplary embodiment, step S220 is the target base station functional network element switching the source base station functional network element-user plane functional path to the target base station functional network element through the core network. The PDU session update request message sent by the target base station functional network element comprises a PDU session list to be switched, a PDU session list which is switched failure, a reason of the switching failure, UE position information, identification information of the target base station functional network element and the like. The PDU session list referred to in the PDU session update request message may be a list related to handover of the air interface.
After the target base station functional network element sends the PDU session update request message to the connection control function in step S220 and before the user equipment location update response message sent by the mobility management function and the PDU session update response message sent by the connection control function are received in step S230, the following interactions are performed by the other functional modules except the target base station functional network element and the source base station functional network element:
the connection control function confirms that the user plane function has the capability of serving the user equipment, namely, the user plane function can continue to serve the user equipment is confirmed, and a connection control function-user plane function session modification request is sent to the user plane function; the session modification request is used for requesting the user plane function to switch the user plane function path to the target base station function network element;
The user plane function sends a connection control function-user plane function session modification response to the connection control function;
the connection control function may send a PDU session update response message to the target base station function network element at any time after receiving the connection control function-user plane function session modification response.
The PDU session update may be successful or failed, and if the PDU session update response message indicates that the PDU session update is successful, the PDU session update response message includes a switched PDU session list and a PDU session list that is failed to be switched.
After the user plane function sends a connection control function-user plane function session modification response to the connection control function, the user plane function also sends a data packet containing an End Marker (End Marker) to the source base station function network element, where the End Marker is used to indicate the End of the data flow to the source base station function network element, and the source base station function network element sends the data packet with the End Marker to the target base station function network element.
In addition, after the target base station functional network element sends the UE location update request message to the mobility management function, the mobility management function performs UE location update, and sends a UE location update response message to the target base station functional network element at any time after location update is completed. That is, the procedure of the UE location update and the procedure of the PDU session update are performed regardless of each other, and do not affect each other.
After that, step S230 is executed, after receiving the ue location update response message sent by the mobility management function and receiving the PDU session update response message sent by the connection control function, the target base station functional network element sends a resource release message to the source base station functional network element, so as to instruct the source base station functional network element to release the resources associated with the ue, and trigger the source base station functional network element to release the resources associated with the ue, thereby completing the handover of the base station.
In an exemplary embodiment, after completing the base station handover, if the user equipment satisfies the registration update condition of the mobile type, the user equipment initiates the registration update of the mobile type at the target base station functional network element. The registration update procedure of the mobile type is performed in accordance with the relevant communication protocol, which will not be described in detail.
Fig. 4 shows an interaction diagram of a base station handover method according to an exemplary embodiment of the present disclosure, which is fully described below in connection with fig. 4.
In step S0, in the handover preparation and execution phase, the source base station functional network element transmits the PDU session context of the user equipment, etc., to the target base station functional network element.
Through the information interaction between the source base station functional network element and the target base station functional network element, the UE is determined to be switched to the target base station functional network element, wherein the content consistent with the prior art in the switching preparation and execution stages is not repeated.
In step S1, the target base station functional network element receives a handover request from the source base station functional network element, and sends a user equipment location update request message to the mobility management function.
The handover request is used for requesting a user equipment connected to the source base station functional network element to be handed over from the source base station functional network element to the target base station functional network element. The handover request may include, but is not limited to, UE location information, target base station functional network element identification, etc.
In step S2, the target base station functional network element sends a protocol data unit PDU session update request message to the connection control function.
The connection control function is determined based on the connection control function identifier in the PDU session context of the user equipment, and corresponds to the user equipment.
The PDU session update request message includes, but is not limited to, a PDU session list for handover preparation, a PDU session list for handover failure, and a cause of handover failure, UE location information, and a target base station function network element identifier.
It should be noted that, the execution sequence of the step S1 and the step S2 is not limited to sequential order, and may be executed simultaneously.
In step S3, the connection control function confirms that the user plane function has the capability of serving the user equipment, and sends a connection control function-user plane function session modification request to the user plane function.
The session modification request is used for requesting the user plane function to switch the user plane function path to the target base station function network element.
In step S4, the user plane function sends a connection control function-user plane function session modification response to the connection control function.
Wherein N4 session modification is performed before the user plane function sends a connection control function-user plane function session modification response to the connection control function, and the session modification process is not particularly limited in the embodiment of the present disclosure.
In step S5, the user plane function sends a data packet including an end flag to the source base station function network element, where the end flag is used to indicate the end of the data flow to the source base station function network element, and the source base station function network element sends the end flag to the target base station function network element.
In step S6, the connection control function sends a PDU session update response message to the target base station function network element, confirming success or failure of session update.
If the PDU session update response message indicates that the PDU session update is successful, the PDU session update response message includes a switched PDU session list and a PDU session list that fails the switch.
Wherein step S6 may occur at any time after the connection control function receives a connection control function-user plane function session modification response.
In step S7, the mobility management function sends a user equipment location update response message to the target base station function network element.
Wherein step S7 may occur at any time after the user equipment location update is completed.
In step S8, after receiving the user equipment location update response message sent by the mobility management function and the PDU session update response message sent by the connection control function, the target base station functional network element sends a resource release message to the source base station functional network element to instruct the source base station functional network element to release the resources associated with the user equipment.
And triggering a process of releasing the resources associated with the user equipment after the source base station functional network element receives the resource release message of the target base station functional network element.
In step S9, if the ue satisfies the mobility type registration update condition, the ue initiates mobility type registration update at the target base station functional network element.
In the process of switching the base station, in the process of switching the user equipment from the source base station functional network element to the target base station functional network element, the target base station functional network element can directly interact with the network function in the core network, can send a UE position update request message to the mobility management function in parallel, send a PDU session update request message to the connection control function, and receive a UE position response message sent by the mobility management function and a PDU session update response message sent by the connection control function, so as to trigger the source base station to release resources associated with the UE, complete the base station switching, reduce the forwarding process of unnecessary centralized nodes in the network, save the processing capacity of the network function in the core network, improve the interaction efficiency of the wireless network and the core network, and reduce the signaling delay; compared with a control mode of centralized node forwarding, the target base station functional network element of the embodiment of the disclosure can directly interact with the network function of the core network through the server interface, does not need to pass through a unified centralized node, is not easy to become a performance and safety bottleneck, improves the reliability and interaction flexibility of the network, and does not need complex network configuration even if new functions are added in the network subsequently.
Further, according to an exemplary embodiment of the present disclosure, there is also provided an access network, as shown in fig. 5, where the access network 500 includes a source base station functional network element 510, a user equipment 520 connected to the source base station functional network element 510, and a target base station functional network element 530, and the target base station functional network element 530 is a base station functional network element to which the user equipment 520 is switched by the source base station functional network element 510. It should be noted that the connection relationship between the modules shown in fig. 5 is only partially exemplary. Wherein: the target base station functional network element 530 is configured to:
receiving a handover request of the source base station functional network element 510, sending a user equipment location update request message to a mobility management function, where the handover request is used to request that a user equipment 520 connected to the source base station functional network element 510 be handed over from the source base station functional network element 510 to a target base station functional network element 530;
transmitting a protocol data unit, PDU, session update request message to a connection control function, the connection control function being determined based on a PDU session context of the user equipment 520;
and receiving a user equipment position update response message sent by the mobility management function and receiving a PDU session update response message sent by the connection control function, and sending a resource release message to the source base station functional network element 510 to instruct the source base station functional network element 510 to release the resources associated with the user equipment 520.
In an exemplary embodiment of the present disclosure, the target base station functional network element 530 is further configured to:
receiving a PDU session context of the user equipment 520 sent by the source base station functional network element 510, wherein the PDU session context of the user equipment 520 carries a connection control function identifier; and acquiring the connection control function corresponding to the user equipment 520 according to the connection control function identifier.
In an exemplary embodiment of the present disclosure, the target base station functional network element 530 is further configured to:
receiving a data packet carrying an end mark sent by the source base station functional network element 510, where the end mark is used to indicate the end of the data flow to the source base station functional network element 510; the data packet carrying the end mark is sent to the source base station functional network element 510 after the user plane function sends a session modification response to the connection control function.
Since specific details of the respective functional modules (units) involved in the access network of the exemplary embodiment of the present disclosure have been described in detail in the above-described exemplary embodiment of the base station handover method, a detailed description thereof will be omitted.
Further, according to an exemplary embodiment of the present disclosure, there is also provided a base station functional network element, which is a network element implementing a base station function. As shown in fig. 6, a base station functional network element 600 of an embodiment of the present disclosure may include:
A first processing module 610, configured to receive a handover request of a source base station functional network element, send a user equipment location update request message to a mobility management function, where the handover request is used to request a user equipment connected to the source base station functional network element to be handed over from the source base station functional network element to the base station functional network element;
a determining module 620, configured to determine a connection control function corresponding to the user equipment based on the PDU session context of the user equipment;
a second processing module 630, configured to send a protocol data unit PDU session update request message to the connection control function;
and a third processing module 640, configured to receive the ue location update response message sent by the mobility management function and receive the PDU session update response message sent by the connection control function, and send a resource release message to the source base station functional network element, so as to instruct the source base station functional network element to release the resources associated with the ue.
In an exemplary embodiment of the present disclosure, the third processing module 640 is further configured to receive a data packet sent by the source base station functional network element and carrying an end tag, where the end tag is used to indicate an end of the data flow to the source base station functional network element; the data packet carrying the end mark is sent to the source base station functional network element after the user plane function sends a session modification response to the connection control function.
In an exemplary embodiment of the present disclosure, if the PDU session update response message indicates that the PDU session update was successful, the PDU session update response message includes a list of PDU sessions that have been switched and a list of PDU sessions that failed to be switched.
It should be noted that although in the above detailed description several modules or units of a base station functional network element are mentioned, this division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit in accordance with embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into a plurality of modules or units to be embodied.
Furthermore, in exemplary embodiments of the present disclosure, a computer storage medium capable of implementing the above-described method is also provided. On which a program product is stored which enables the implementation of the method described above in the present specification. In some possible embodiments, the various aspects of the present disclosure may also be implemented in the form of a program product comprising program code for causing a terminal device to carry out the steps according to the various exemplary embodiments of the disclosure as described in the "exemplary methods" section of this specification, when the program product is run on the terminal device.
The disclosed embodiments also provide a program product for implementing the above method, which may employ a portable compact disc read-only memory (CD-ROM) and include program code, and may be run on a terminal device, such as a personal computer. However, the program product of the present disclosure is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: an electrical connection having one or more wires, a portable disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The computer readable signal medium may include a data signal propagated in baseband or as part of a carrier wave with readable program code embodied therein. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Program code embodied on a readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Program code for carrying out operations of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device, partly on a remote computing device, or entirely on the remote computing device or server. In the case of remote computing devices, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., connected via the Internet using an Internet service provider).
In addition, in an exemplary embodiment of the present disclosure, a communication apparatus capable of implementing the above method is also provided. Those skilled in the art will appreciate that the various aspects of the present disclosure may be implemented as a system, method, or program product. Accordingly, various aspects of the disclosure may be embodied in the following forms, namely: an entirely hardware embodiment, an entirely software embodiment (including firmware, micro-code, etc.) or an embodiment combining hardware and software aspects may be referred to herein as a "circuit," module "or" system.
A communication device 700 according to such an embodiment of the present disclosure is described below with reference to fig. 7. The communication device 700 shown in fig. 7 is merely an example and should not be construed as limiting the functionality and scope of use of the disclosed embodiments.
As shown in fig. 7, the communication apparatus 700 includes: a processor 701 and a memory 702; memory 702 stores instructions executable by processor 701; the processor 701 is configured to execute the instructions, causing the communication device 700 to implement the method as described in the method embodiments described before.
From the above description of embodiments, those skilled in the art will readily appreciate that the example embodiments described herein may be implemented in software, or in combination with the necessary hardware. Thus, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (may be a CD-ROM, a U-disk, a mobile hard disk, etc.) or on a network, and includes several instructions to cause a computing device (may be a personal computer, a server, a terminal device, or a network device, etc.) to perform the method according to the embodiments of the present disclosure.
Furthermore, the above-described figures are only schematic illustrations of processes included in the method according to the exemplary embodiments of the present disclosure, and are not intended to be limiting. It will be readily appreciated that the processes shown in the above figures do not indicate or limit the temporal order of these processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, for example, among a plurality of modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims (10)

1. A base station handover method, comprising:
the method comprises the steps that a target base station functional network element receives a switching request of a source base station functional network element, and sends a user equipment position updating request message to a mobility management function, wherein the switching request is used for requesting user equipment connected with the source base station functional network element to be switched from the source base station functional network element to the target base station functional network element;
Transmitting a protocol data unit, PDU, session update request message to a connection control function, the connection control function being determined based on a PDU session context of the user equipment;
and receiving a user equipment position updating response message sent by the mobility management function and receiving a PDU session updating response message sent by the connection control function, and sending a resource release message to the source base station functional network element so as to instruct the source base station functional network element to release the resources associated with the user equipment.
2. The method according to claim 1, characterized in that before said sending a user equipment location update request message to a mobility management function, the method further comprises:
receiving a PDU session context of the user equipment sent by the source base station functional network element, wherein the PDU session context of the user equipment carries a connection control function identifier;
determining the connection control function based on the PDU session context of the user equipment, comprising:
and acquiring the connection control function corresponding to the user equipment according to the connection control function identifier.
3. The method of claim 1, wherein the PDU session update response message is sent after the connection control function receives a session modification response sent by a user plane function;
The session modification response is sent after the user plane function receives a session modification request sent by the connection control function, and the session modification request is sent after the connection control function determines that the user plane function has the capability of serving the user equipment;
the session modification request is used for requesting the user plane function to switch a user plane function path to the target base station function network element.
4. A method according to claim 3, characterized in that the method further comprises:
the target base station functional network element receives a data packet which is sent by the source base station functional network element and carries an end mark, wherein the end mark is used for indicating the end of a data stream to the source base station functional network element;
and the data packet carrying the end mark is sent to the source base station function network element after the user plane function sends the session modification response to the connection control function.
5. The method according to any one of claim 1 to 4, wherein,
and if the PDU session updating response message indicates that PDU session updating is successful, the PDU session updating response message comprises a switched PDU session list and a PDU session list which is failed to be switched.
6. An access network is characterized in that the access network comprises a source base station functional network element, user equipment connected with the source base station functional network element and a target base station functional network element, wherein the target base station functional network element is a base station functional network element to which the user equipment is switched by the source base station functional network element; the target base station functional network element is configured to:
receiving a switching request of a source base station functional network element, and sending a user equipment position updating request message to a mobility management function, wherein the switching request is used for requesting user equipment connected with the source base station functional network element to be switched from the source base station functional network element to the target base station functional network element;
transmitting a protocol data unit, PDU, session update request message to a connection control function, the connection control function being determined based on a PDU session context of the user equipment;
and receiving a user equipment position updating response message sent by the mobility management function and receiving a PDU session updating response message sent by the connection control function, and sending a resource release message to the source base station functional network element so as to instruct the source base station functional network element to release the resources associated with the user equipment.
7. The access network of claim 6, wherein the target base station functional network element is further configured to:
receiving a PDU session context of the user equipment sent by the source base station functional network element, wherein the PDU session context of the user equipment carries a connection control function identifier;
and acquiring the connection control function corresponding to the user equipment according to the connection control function identifier.
8. A base station functional network element, characterized in that the base station functional network element is a network element for implementing a base station function, the base station functional network element comprising:
a first processing module, configured to receive a handover request of a source base station functional network element, and send a user equipment location update request message to a mobility management function, where the handover request is used to request a user equipment connected to the source base station functional network element to be handed over from the source base station functional network element to the base station functional network element;
a determining module, configured to determine a connection control function corresponding to the user equipment based on a PDU session context of the user equipment;
a second processing module, configured to send a protocol data unit PDU session update request message to the connection control function;
and the third processing module is used for receiving the user equipment position updating response message sent by the mobility management function and receiving the PDU session updating response message sent by the connection control function, and sending a resource release message to the source base station functional network element so as to instruct the source base station functional network element to release the resources associated with the user equipment.
9. A communication device, the communication device comprising:
a processor and a memory;
the memory stores instructions executable by the processor;
the processor is configured to, when executing the instructions, cause the communication device to implement the method of any one of claims 1 to 5.
10. A computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method according to any of claims 1 to 5.
CN202310521764.4A 2023-05-09 2023-05-09 Base station switching method, access network, network element, device and storage medium Pending CN116456411A (en)

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