CN115348631B

CN115348631B - Switching control method, device, terminal and storage medium in ultra-dense network

Info

Publication number: CN115348631B
Application number: CN202210769721.3A
Authority: CN
Inventors: 黄勇; 李伟超
Original assignee: Peng Cheng Laboratory
Current assignee: Peng Cheng Laboratory
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2024-04-16
Anticipated expiration: 2042-07-01
Also published as: CN115348631A

Abstract

The invention discloses a switching control method, a device, a terminal and a storage medium in an ultra-dense network, wherein the method comprises the following steps: broadcasting all base station information in the service area, and establishing connection with the mobile terminal; completing access authentication of the mobile terminal to a core network, generating an activation code and sending the generation parameter information of the special activation code of the mobile terminal to the mobile terminal; checking first connection data request information sent by the mobile terminal, and if the first connection data request information contains an activation code meeting a preset standard, sending a data connection admission message to realize communication of service data of the mobile terminal; detecting the state of the mobile terminal when switching the base station, checking the second connection data request information sent by the mobile terminal, and realizing the communication of the mobile terminal service data after the second connection data request information is checked to be qualified; after the method is adopted, the mobile terminal realizes one-time authentication in the network area, and even if the mobile terminal moves to other cells in the area, the mobile terminal does not need to perform re-authentication to the core network, thereby reducing the burden of the network.

Description

Switching control method, device, terminal and storage medium in ultra-dense network

Technical Field

The present invention relates to the field of network switching, and in particular, to a switching control method, device, terminal and storage medium in an ultra-dense network.

Background

With the development of mobile networks, miniaturization/densification of base stations is a major trend in the development of wireless networks. The ultra-dense network is characterized in that small base stations are adopted and densely deployed, and the coverage area of the base stations is reduced from the original 100 meters to 10-50 meters.

For densely deployed base stations, due to the limitation of terminal optical fiber resources, many base stations adopt wireless backhaul, and the wireless backhaul mainly adopts millimeter wave and point-to-point microwave modes. Ultra dense networks may lead to further increases in capacity and connection density from the user data side. However, the dense deployment of base stations/APs in ultra-dense networks presents a significant challenge for resource management and communication security, and if users move in an ultra-dense network, according to existing architecture systems, frequent authentication and key distribution operations can result, resulting in a large amount of communication signaling, resulting in delays or interruptions in service, and impact on network infrastructure.

Disclosure of Invention

In view of the foregoing drawbacks of the prior art, an object of the present application is to provide a method, an apparatus, a terminal, and a storage medium for handover control in an ultra-dense network, which are aimed at solving the problem that network stability is affected when a base station is handed over in the ultra-dense network.

In order to solve the above technical problem, a first aspect of an embodiment of the present application provides a handover control method in an ultra-dense network, where the method includes:

establishing connection between a mobile terminal and a control base station based on a signaling message sent by the mobile terminal;

based on the signaling message, completing access authentication from the mobile terminal to a core network, and generating a special activation code of the mobile terminal;

sending the generated parameter information of the special activation code of the mobile terminal to the mobile terminal;

checking first connection data request information sent by a mobile terminal, and if the first connection data request information contains an activation code meeting a preset standard, sending a data connection admission message to realize the communication of service data of the mobile terminal;

detecting the state of the mobile terminal when switching the base station, selecting the mode of switching the base station based on the state of the mobile terminal when switching the base station, checking second connection data request information sent by the mobile terminal, and sending a data connection admission message to realize the communication of the mobile terminal service data if the second connection data request information contains an activation code meeting a preset standard.

As a further improved technical solution, the establishing connection between the mobile terminal and the control base station based on the signaling message sent by the mobile terminal includes:

Controlling the base station to broadcast information of all base stations in the coverage area;

the control base station receives access request information sent by a mobile terminal through a first base station, wherein the access request information comprises encrypted mobile terminal identification, and the first base station scans base station signals at the position of the first base station after receiving the base station information for the mobile terminal, and selects an accessed base station based on the strength of the base station signals;

after the first base station establishes the bottom layer communication with the mobile terminal, the control base station establishes connection with the mobile terminal through the first base station.

As a further improved technical solution, the step of completing access authentication of the mobile terminal to a core network based on the signaling message, and the step of generating the mobile terminal exclusive activation code includes:

the control base station receives the access request information and then sends an authentication message to a core network authentication center, wherein the access request information is the access request information identified and confirmed by the first base station;

the control base station receives an access authorization message sent by the core network authentication center, wherein the access authorization message is an access authorization message which passes through the authentication of the core network authentication center;

The control base station establishes a control surface context of the mobile terminal according to the access authorization message, and generates the exclusive activation code of the mobile terminal in the process of establishing the control context.

As a further improved technical solution, sending the generation parameter information of the mobile terminal dedicated activation code to the mobile terminal includes:

the control base station sends an access authorization message and the generation parameter information of the special activation code of the mobile terminal to the first base station, and meanwhile, the control base station searches a core network gateway corresponding to the first base station and sends a message for creating a context to the core network gateway, and the core network gateway responds to the success of the establishment of the control base station after establishing the context of the data surface of the mobile terminal;

and the first base station sends the access authorization message and the generation parameter information of the mobile terminal exclusive activation code to the mobile terminal, wherein after receiving the access authorization message and the generation parameter information of the mobile terminal exclusive activation code, the first base station establishes the user plane context and sets the activation state of the user plane context.

As a further improved technical solution, the checking the first connection data request information sent by the mobile terminal, if the first connection data request information includes an activation code meeting a preset standard, sending a data connection admission message, and implementing communication of service data of the mobile terminal includes:

The control base station receives first connection data request information sent by the mobile terminal through a first base station, wherein an activation code contained in the first connection data request information is obtained by calculating the generation parameter information of the special activation code of the mobile terminal after the mobile terminal receives the access authorization message and the generation parameter information of the special activation code of the mobile terminal;

the control base station checks the activation code in the first data connection request information, if the activation code is the activation code meeting the preset standard, the control base station sends a data connection admission message to the first base station to realize normal communication of service data, wherein after the first base station receives the data connection admission message, the user plane context of the corresponding mobile terminal is set to be in an activation state, after the setting is completed, the first base station sends information capable of carrying out data communication to the mobile terminal, and after the mobile terminal receives the information capable of carrying out data communication, the normal communication of the service data is realized through the first base station and a core network gateway.

As a further improved technical solution, the detecting the state of the mobile terminal when switching the base station, selecting a mode of switching the base station based on the state of the mobile terminal when switching the base station, and checking second connection data request information sent by the mobile terminal, if the second connection data request information includes an activation code meeting a preset standard, sending a data connection admission message, and implementing communication of service data of the mobile terminal includes:

The control base station detects that the state of the mobile terminal when switching the base station is that communication is not performed in the process that the mobile terminal moves to the cell of the second base station, data receiving and transmitting occur after the mobile terminal moves to the cell of the second base station, at this time, the mobile terminal is switched to the second base station by the first base station, the control base station selects to directly switch the base station, the control base station selects to switch the base station, and checks second data connection request information sent by the mobile terminal through the second base station, if the second data connection request information passes the check, the control base station selects to activate a user plane context to realize communication with service data of the second base station;

The control base station detects that the state when the mobile terminal switches the base station is that the mobile terminal is ready to be switched to the second base station by the first base station while using data receiving and transmitting, the control base station selects a mode of switching the base station, checks and receives second data connection request information sent by the mobile terminal, and if the second data connection request information passes the check, the control base station selects to complete the switching preparation, so that communication of service data with the second base station is realized.

As a further improved technical solution, when the control base station detects that the mobile terminal is not communicating in the process of moving to the cell of the second base station, the mobile terminal is moved to the cell of the second base station, and then data receiving and transmitting occurs, at this time, the mobile terminal is switched to the second base station by the first base station, the control base station selects a direct base station switching mode, the control base station selects a base station switching mode, and checks second data connection request information sent by the mobile terminal through the second base station, and if the second data connection request information passes the check, the control base station selects and activates a user plane context, so as to realize communication of service data with the second base station, including:

The control base station detects that the state when the mobile terminal is switched to the base station is that communication is not performed in the process that the mobile terminal moves to the cell of the second base station, data receiving and transmitting occur after the mobile terminal moves to the cell of the second base station, at the moment, the mobile terminal is switched to the second base station by the first base station, and the control base station selects a direct switching base station;

and the control base station checks the activation code in the second data connection request information, if the activation code is the activation code meeting the preset standard, the control base station sends a data connection admission message to the second base station to realize the communication of the mobile terminal and the service data of the second base station, wherein the second base station activates the user plane context after receiving the data connection admission message and sends the information capable of carrying out data communication to the mobile terminal, and the mobile terminal realizes the normal communication of the service data through the second base station and a core network gateway after receiving the information capable of carrying out data communication.

As a further improved technical solution, the control base station detects that the state when the mobile terminal switches base stations is that the mobile terminal prepares to switch from the first base station to the second base station while using data transmission and reception, the control base station selects a mode of switching base stations, checks and receives second data connection request information sent by the mobile terminal, and if the second data connection request information passes the check, the control base station selects to complete the switching preparation, and the implementation of communication of service data with the second base station includes:

After the control base station detects that the mobile terminal decides to switch from a first base station to a second base station when the mobile terminal uses data transceiving, the control base station receives second data connection request information sent by the mobile terminal through the first base station, and the control base station selects to switch for preparation before switching of the base station;

the control base station checks the activation code in the second data connection request information, and if the activation code is the activation code meeting the preset standard, the control base station sends a switching preparation message to the second base station;

after receiving the switching preparation completion information of the second base station, the control base station sends a switching instruction to the mobile terminal through the first base station, and the mobile terminal completes switching after receiving the switching instruction, so as to realize communication with service data of the second base station.

As a further improved technical solution, after the mobile terminal realizes the normal communication of the service data, updating the activation code periodically, and after the mobile terminal realizes the normal communication of the service data, updating the activation code periodically includes: after the mobile terminal realizes normal communication of service data, the control base station updates the activation code at intervals, and sends the updated generation parameter information of the special activation code of the mobile terminal to the mobile terminal, and the mobile terminal recalculates the activation code after receiving the updated generation parameter information of the special activation code of the mobile terminal.

A second aspect of the embodiments of the present application provides a handover control device in an ultra-dense network, including:

the first connection module is used for establishing connection between the mobile terminal and the control base station based on signaling messages sent by the mobile terminal;

the authentication module is used for completing access authentication of the mobile terminal to a core network based on the signaling message and generating a special activation code of the mobile terminal;

the information sending module is used for sending the generated parameter information of the special activation code of the mobile terminal to the mobile terminal;

the connection request module is used for checking first connection data request information sent by the mobile terminal, and sending a data connection admission message to realize the communication of the mobile terminal service data if the first connection data request information contains an activation code meeting a preset standard;

and the switching connection module is used for detecting the state of the mobile terminal when switching the base station, selecting the mode of switching the base station based on the state of the mobile terminal when switching the base station, checking second connection data request information sent by the mobile terminal, and sending a data connection admission message to realize the communication of the mobile terminal service data if the second connection data request information contains an activation code meeting a preset standard.

A third aspect of the embodiments of the present application provides a terminal device, including: a processor, a memory, and a communication bus; the memory has stored thereon a computer readable program executable by the processor;

the communication bus realizes connection communication between the processor and the memory;

the processor, when executing the computer readable program, is configured to implement the steps of: establishing connection between a mobile terminal and a control base station based on a signaling message sent by the mobile terminal; based on the signaling message, completing access authentication from the mobile terminal to a core network, and generating a special activation code of the mobile terminal; sending the generated parameter information of the special activation code of the mobile terminal to the mobile terminal; checking first connection data request information sent by a mobile terminal, and if the first connection data request information contains an activation code meeting a preset standard, sending a data connection admission message to realize the communication of service data of the mobile terminal; detecting the state of the mobile terminal when switching the base station, selecting the mode of switching the base station based on the state of the mobile terminal when switching the base station, checking second connection data request information sent by the mobile terminal, and sending a data connection admission message to realize the communication of the mobile terminal service data if the second connection data request information contains an activation code meeting a preset standard.

A fourth aspect of the present application provides a computer-readable storage medium storing one or more programs executable by one or more processors, the computer programs when executed by the processors implementing the steps of:

establishing connection between a mobile terminal and a control base station based on a signaling message sent by the mobile terminal; based on the signaling message, completing access authentication from the mobile terminal to a core network, and generating a special activation code of the mobile terminal; sending the generated parameter information of the special activation code of the mobile terminal to the mobile terminal; checking first connection data request information sent by a mobile terminal, and if the first connection data request information contains an activation code meeting a preset standard, sending a data connection admission message to realize the communication of service data of the mobile terminal; detecting the state of the mobile terminal when switching the base station, selecting the mode of switching the base station based on the state of the mobile terminal when switching the base station, checking second connection data request information sent by the mobile terminal, and sending a data connection admission message to realize the communication of the mobile terminal service data if the second connection data request information contains an activation code meeting a preset standard.

Compared with the prior art, the invention adopts a switching control method in the ultra-dense network, which comprises the steps that the mobile terminal establishes connection with the control base station based on signaling information sent by the mobile terminal; based on the signaling message, completing access authentication from the mobile terminal to a core network, and generating a special activation code of the mobile terminal; sending the generated parameter information of the special activation code of the mobile terminal to the mobile terminal; checking first connection data request information sent by a mobile terminal, and if the first connection data request information contains an activation code meeting a preset standard, sending a data connection admission message to realize the communication of service data of the mobile terminal; detecting the state of the mobile terminal when switching the base station, selecting the mode of switching the base station based on the state of the mobile terminal when switching the base station, checking second connection data request information sent by the mobile terminal, and if the second connection data request information contains an activation code meeting a preset standard, sending a data connection admission message to realize the communication of the mobile terminal service data; after the method is adopted, the base station switching program is simplified, and after the mobile terminal realizes one-time authentication in the network area, the mobile terminal does not need to perform re-authentication to the core network even if moving to other cells in the area, thereby reducing the network load.

Drawings

Fig. 1 is a flow chart of a handover control method in an ultra dense network of the present invention.

Fig. 2 is a schematic diagram of an ultra-dense network in a handover control method in an ultra-dense network according to the present invention.

Fig. 3 is a flow chart of the update of the activate code in the handover control method in the ultra-dense network according to the present invention.

Fig. 4 is a flow chart of handover when the mobile terminal has no service communication in the handover control method in the ultra-dense network of the present invention.

Fig. 5 is a handover flow chart of a mobile terminal having traffic communication in the handover control method in the ultra-dense network of the present invention.

Fig. 6 is a network model diagram in the handover control method in the ultra-dense network of the present invention.

Fig. 7 is a flowchart of a mobile terminal first access network registration and authentication in the handover control method in the ultra-dense network of the present invention.

Fig. 8 is a schematic structural diagram of a terminal device provided by the present invention.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

The inventors have found that the following problems exist in the prior art:

in the existing 5G system, the control plane connection of the user terminal depends on each attached base station RRC control connection, all NAS signaling needs to be implemented through the RRC control connection, and when the user moves to other base stations, the RRC connection needs to be re-established.

The 5G latest standard proposes an RRC inactive state, which attempts to speed up the signaling overhead time when the UE is reconnected, but is not considered to be suitable for future ultra-dense networks.

The description of ultra dense networks is as follows:

as shown in fig. 2, there are multiple base stations deployed in a distributed manner, such as the small/micro base stations in fig. 2, within a coverage area. The small base station is provided with a wired/fixed wireless backhaul line, and the micro base station realizes backhaul through the small base station nearby the wireless connection. The small micro base station mainly provides high-rate data transmission services. In each area, ranging from about several hundred square meters to 1 square kilometer, there is one control base station cBS responsible for management signaling processing for all base stations and user terminals in the area. The control base station adopts a lower frequency band to realize larger coverage, mainly provides services for the control signaling transmission of the small/micro base station and the user mobile terminal in the coverage area, and additionally provides specific service types such as emergency call and the like, and data surface transmission of specific user terminals (such as blind supplement or high-level guaranteed users). To enhance network flexibility, there may also be removable micro base stations that implement auxiliary coverage to enhance access capability and communication capacity at a location. The area access to the core network can be provided with a plurality of data lines which are connected with the user plane of the core network; a separate line connects the control base station to the core network control plane.

To reduce the cost of mobile terminals, most mobile terminals receive information from the controlling base station only in one direction. The control signaling of the mobile terminal uplink is sent to the attached small/micro base station, and the user signaling message is forwarded to cBS by the small/micro base station of the first hop. This avoids the need for a large number of ues to simultaneously control the uplink channel management of the base station and the small/micro base station. The complexity and the electricity consumption of the terminal are reduced.

In order to solve the above problems, various non-limiting embodiments of the present application are described in detail below with reference to the accompanying drawings.

As shown in fig. 1 and 7, the switching control method in an ultra-dense network provided in the embodiment of the present application includes the following steps:

s1, establishing connection between a mobile terminal and a control base station based on a signaling message sent by the mobile terminal;

wherein the establishing connection between the mobile terminal and the control base station based on the signaling message sent by the mobile terminal comprises:

s101, controlling a base station to broadcast information of all base stations in a covered area;

s102, the control base station receives access request information sent by a mobile terminal through a first base station, wherein the access request information comprises encrypted mobile terminal identification, the first base station scans base station signals at the position of the first base station after receiving the base station information for the mobile terminal, and selects an accessed base station based on the strength of the base station signals;

And S103, after the first base station and the mobile terminal establish the bottom communication, the control base station establishes connection with the mobile terminal through the first base station, wherein the first base station establishes the bottom communication with the mobile terminal as the signal sent by the mobile terminal through the synchronous first base station, and realizes uplink and downlink synchronization with the first base station through a random access technology, so that the mobile terminal establishes the bottom communication with the first base station.

As shown in fig. 6, based on the ultra-dense network, there are one control base station cBS and a plurality of data base stations gNB in a region, where the plurality of data base stations gNB all establish communication connection with the control base station cBS through a core network, the plurality of data base stations gNB include a first base station gNB1 and a second base station gNB2, the control base station cBS broadcasts information of all data base stations in the covered region, after receiving the information of the data base stations, the mobile terminal UE scans data base station signals at the location at the same time, decides to access the first base station gNB1, and the mobile terminal synchronizes uplink and downlink with the first base station by synchronizing signals sent by the first base station, and realizes uplink and downlink synchronization with the first base station through a random access technology, so that the mobile terminal establishes an underlying communication with the first base station, and after the first base station establishes an underlying communication with the mobile terminal, the control base station establishes a connection with the mobile terminal.

S2, completing access authentication of the mobile terminal to a core network based on the signaling message, and generating a special activation code of the mobile terminal;

wherein the step of completing the access authentication from the mobile terminal to the core network based on the signaling message, and the step of generating the mobile terminal exclusive activation code comprises the following steps:

s201, the control base station sends an authentication message to a core network authentication center after receiving the access request information, wherein the access request information is the access request information identified and confirmed by the first base station;

s202, the control base station receives an access authorization message sent by the core network authentication center, wherein the access authorization message is an access authorization message which passes through the authentication of the core network authentication center;

s203, the control base station establishes a control surface context of the mobile terminal according to the access authorization message, and generates a special activation code of the mobile terminal in the process of establishing the control context;

specifically, the mobile terminal UE sends access request information to the first base station gNB1, where the access request information carries an encrypted mobile terminal identifier sui, and after receiving a request message sent by the mobile terminal, the first base station identifies that the request message is an access request signaling message, and forwards the message to the control base station cBS, and after receiving the access request information, the control base station sends an authentication message to the core network authentication center AUSF, and after passing the authentication of the core network authentication center AUSF, the control base station responds to the access authorization message; the responding message comprises a mobile terminal global temporary identifier (5G-GUTI), wherein the 5G-GUTI:5G Global User Temperal Identification is a temporary identifier of the core network defined in the 5G standard for global identifier of the online user, and the control base station establishes a control context of the mobile terminal after receiving an authentication passing message from the core network. In the process of generating the context, the base station is controlled to generate an activation code at the same time, the activation code is calculated and generated in a one-way hash mode, and the hash parameter comprises the time uTime of the current generated context and the identifier 5G-GUTI of the user; and the control base station sends the identification 5G-GUTI of the mobile terminal and uTime for calculating the activation code to the first base station through an access confirmation message.

S3, sending the generated parameter information of the special activation code of the mobile terminal to the mobile terminal;

wherein sending the generation parameter information of the mobile terminal dedicated activation code to the mobile terminal includes:

s301, the control base station sends an access authorization message and the generation parameter information of the special activation code of the mobile terminal to a first base station, and meanwhile, the control base station searches a core network gateway corresponding to the first base station and sends a message for creating a context to the core network gateway, and the core network gateway responds to the success of the establishment of the control base station after establishing the data plane context of the mobile terminal;

s302, the first base station sends an access authorization message and the generation parameter information of the special activation code of the mobile terminal to the mobile terminal, wherein after the first base station receives the access authorization message and the generation parameter information of the special activation code of the mobile terminal, the first base station establishes the user plane context and sets the activation state of the user plane context.

Specifically, the control base station searches a core network gateway corresponding to the first base station, sends a message to the core network gateway, and creates a control plane context of the mobile terminal. The control base station is responsible for distributing network parameters (such as IP address) and QoS parameters and sending the parameters to the core network gateway.

The core network gateway establishes the data plane context of the mobile terminal and responds to the success of the control base station establishment.

And when the response control base station is successfully established, the first base station receives an authentication passing message, wherein the authentication passing message additionally carries user plane information of the mobile terminal, including an IP address, qoS parameters and the like. The first base station establishes a control plane context of the mobile terminal, the control plane context of the mobile terminal has an activation state, and based on a strategy, the control plane context of the mobile terminal can be activated immediately after the authentication of the mobile terminal is passed, and the mode is called implicit activation; or can be set to be in an inactive state, and the mobile terminal is activated after verification of the activation code through a data connection request. The first base station sends an access confirmation message to the mobile terminal, wherein the message comprises an identifier 5G-GUTI and a uTime value which are distributed to the mobile terminal.

S4, checking first connection data request information sent by the mobile terminal, and if the first connection data request information contains an activation code meeting a preset standard, sending a data connection admission message to realize the communication of service data of the mobile terminal;

wherein, the checking the first connection data request information sent by the mobile terminal, if the first connection data request information includes an activation code meeting a preset standard, sending a data connection admission message, and implementing the communication of the mobile terminal service data includes:

S401, the control base station receives first connection data request information sent by a mobile terminal through a first base station, wherein an activation code contained in the first connection data request information is obtained by calculating the generation parameter information of the special activation code of the mobile terminal after the mobile terminal receives the access authorization message and the generation parameter information of the special activation code of the mobile terminal;

s402, the control base station checks the activation code in the first data connection request information, if the activation code is the activation code meeting the preset standard, the control base station sends a data connection admission message to the first base station to realize normal communication of service data, wherein after the first base station receives the data connection admission message, the user plane context of the corresponding mobile terminal is set to be in an activation state, after the setting is completed, the first base station sends information capable of carrying out data communication to the mobile terminal, and after the mobile terminal receives the information capable of carrying out data communication, the normal communication of service data is realized through the first base station and a core network gateway.

After receiving the access confirmation message, the mobile terminal calculates and stores an activation code by using a hash function identical to that of the control base station by using 5G-GUTI and uTime as hash parameters, and then the mobile terminal needs to activate a self context by using a data connection request before carrying out data communication in all base station cells in all areas served by the control base station, wherein the step of activating the context by using the data connection request is as follows:

The mobile terminal sends a data connection request to the first base station, wherein the request contains the calculated activation code;

after receiving the data connection request, the first base station sends the connection data request to the control base station;

after receiving the first data connection request information, the control base station searches for an activation code corresponding to the mobile terminal in a control plane context of the mobile terminal, compares the activation code with the activation code in the first data connection request information, and after the comparison, the control base station sends a data connection admission message to the first base station;

after receiving the data connection admission message, the first base station sets the stored user plane context of the corresponding mobile terminal to be in an activated state, and then sends the data connection admission message to inform the mobile terminal that data communication can be carried out.

The mobile terminal realizes normal communication of service data through the first base station and the core network gateway.

In the step of registering and authenticating, after the authentication is passed, the control base station generates a unique activation code belonging to the mobile terminal and sends activation code generation information to the mobile terminal, and the mobile terminal generates the activation code in the same way and uses the activation code for controlling all cells covered by the base station to rapidly attach and communicate.

The scheme of the invention can be as follows: after the mobile terminal realizes one-time authentication in the network area covered by the control base station, the mobile terminal does not need to re-authenticate to the core network even if moving to other cells in the area, but still needs to ensure the authentication of the authenticity of the user mobile terminal, and meanwhile, the user credentials are updated regularly to prevent the fake user from counterfeiting the mobile terminal to realize communication. The invention adopts a broadcasting mode to efficiently realize the update of the user certificate and allows the user to access other cells by using the updated certificate.

Specifically, after the mobile terminal realizes normal communication of service data, the activation code is updated periodically.

After the mobile terminal realizes normal communication of service data, periodically updating the activation code comprises: after the mobile terminal realizes normal communication of service data, the control base station updates the activation code at intervals, and sends the updated generation parameter information of the special activation code of the mobile terminal to the mobile terminal, and the mobile terminal recalculates the activation code after receiving the updated generation parameter information of the special activation code of the mobile terminal.

As shown in fig. 3, first, the control base station periodically realizes implicit updating of the activation codes of all mobile terminals, and the implementation method is as follows:

The control base station re-fetches the current time uTime at intervals T (T is called as an implicit updating period of the activation code), and notifies all terminals, the control base station cBS fetches the current time uTime2, and then sends the fetched uTime2 to all user terminals in the area through a broadcast message.

And after receiving uTime2, all the online mobile terminals recalculate the activation code by using a hash function, and in the calculation process, the newly received uTime2 is used as a hash parameter. For example: activate code=h (uTime 2, 5G-GUTI). It should be noted that 5G-GUTI is a globally unique temporary identifier assigned to a mobile terminal in a 5G network. The activation code may also be calculated using other mobile terminal related identifiers, such as SUPI, SUCI, IMSI, TMSI, etc., without loss of generality, in this embodiment, 5G-GUTI is used. At the same time, the control base station cBS recalculates all the saved user activation codes and saves the newly calculated activation codes.

After the time T has elapsed, the control base station periodically updates the uTime value. As in fig. 3, a uTime3 is generated and broadcast to all mobile terminals.

And recalculating the activation codes of all the mobile terminals receiving uTime 3. Meanwhile, the control base station also uses uTime3 to update and calculate the activation codes of all users.

And the implicit updating process of the activation codes of all the mobile terminals is realized by using the broadcast of the control base station. The activation code of the online user can be dynamically and efficiently refreshed, the unauthorized terminal is prevented from illegally accessing the network, and the safety protection of the network is provided.

S5, detecting the state of the mobile terminal when switching the base station, selecting the mode of switching the base station based on the state of the mobile terminal when switching the base station, checking second connection data request information sent by the mobile terminal, and if the second connection data request information contains an activation code meeting a preset standard, sending a data connection admission message to realize the communication of the mobile terminal service data.

The detecting the state of the mobile terminal when switching the base station, selecting a mode of switching the base station based on the state of the mobile terminal when switching the base station, checking second connection data request information sent by the mobile terminal, and if the second connection data request information contains an activation code meeting a preset standard, sending a data connection admission message to realize the communication of the mobile terminal service data, wherein the two situations are as follows:

in the first case, as shown in fig. 4, the control base station detects that the mobile terminal is not communicating in the process of moving to the cell of the second base station when the mobile terminal is switched to the cell of the second base station, and when the mobile terminal is switched to the second base station by the first base station, the control base station selects to directly switch the base station, the control base station selects to switch the base station, checks the second data connection request information sent by the mobile terminal through the second base station, and if the second data connection request information passes the check, the control base station selects to activate the user plane context to realize the communication of the service data with the second base station;

The control base station detects that the mobile terminal is not communicating in the process of moving to the cell of the second base station when the mobile terminal is switched to the cell of the second base station, data receiving and transmitting occur after the mobile terminal moves to the cell of the second base station, at this time, the mobile terminal is switched to the second base station by the first base station, the control base station selects to directly switch the base station, the control base station selects to switch the base station, and checks second data connection request information sent by the mobile terminal through the second base station, if the second data connection request information passes the check, the control base station selects to activate a user plane context, and the communication of service data with the second base station is achieved, including:

Specifically, the mobile terminal moves to the cell of the second base station, and there is a need for data transmission and reception. The mobile terminal and the second base station realize uplink and downlink synchronization by utilizing a random access process.

The mobile terminal completes authentication in the area, and can send and receive data only by one data surface activation process. The activation process is as follows:

the mobile terminal sends second data connection request information to the second base station, wherein the second data connection request information comprises an activation code;

the second base station receives the second data connection request information and then sends the second data connection request information to the control base station;

the control base station checks the activation code in the second data connection request information, namely, based on the user identification 5G-GUTI, searches the control plane context of the mobile terminal stored locally, compares whether the received activation code is the same as the stored mobile terminal activation code, after checking, the control base station sends update context information to a core network gateway, and the core network gateway updates the data plane context of the mobile terminal after receiving the update context information, updates the downlink route and responds that the control base station is updated successfully;

After receiving the information of successful updating, the control base station sends a data connection admission message to a second base station, the second base station sets the user plane context of the corresponding mobile terminal to be in an activated state, and after the setting is completed, the second base station sends information capable of carrying out data communication to the mobile terminal;

the mobile terminal receives the data connection admission message indicating that the data connection at the second base station has been activated and communicates with the network normally through the second base station.

In the second case, as shown in fig. 5, the control base station detects that the state when the mobile terminal switches base stations is that the mobile terminal prepares to switch from the first base station to the second base station while using data transmission and reception, the control base station selects a mode of switching base stations, checks that second data connection request information sent by the mobile terminal is received, and if the second data connection request information passes the check, the control base station selects to complete the switching preparation, so as to realize communication of service data with the second base station.

The control base station detects that the mobile terminal is in a state of switching the base station when the mobile terminal uses data to transmit and receive, and prepares to switch from the first base station to the second base station, the control base station selects a mode of switching the base station, checks and receives second data connection request information sent by the mobile terminal, and if the second data connection request information passes the check, the control base station selects to complete the switching preparation, so that communication of service data with the second base station is realized, wherein the method comprises the following steps:

Specifically, the mobile terminal generates switching application information, and sends the switching application information to the first base station, the first base station sends the switching application information to a control base station, and the switching application information comprises an activation code;

after receiving the switching application information, the control base station checks the activation code in the switching application information, and after the activation code passes the check, the control base station sends a switching preparation message to the second base station;

After the second base station receives the switching preparation information, the second base station establishes a switching context for the mobile terminal, and after the switching context is established successfully, the second base station sends preparation success information to the control base station;

the control base station sends updated context information to a core network gateway, and the control base station sends switching indication information to the mobile terminal through a first base station;

after receiving the updated context information, the core network gateway updates the data plane context of the mobile terminal, changes the downlink route, and responds to successful updating of the control base station;

the mobile terminal and the second base station realize uplink and downlink synchronization, the mobile terminal interacts with the second base station, and the second base station acquires and forwards the user data of the first base station to the mobile terminal, specifically:

the mobile terminal sends a data request to a second base station, wherein the request carries a serial number of connection;

the second base station sends a data transmission request to the first base station;

the first base station sends the residual cached mobile terminal service data packet to the second base station;

the second base station temporarily caches the downlink data before the mobile terminal receives the residual cached data packet. And sending the service data packets to the mobile terminal according to the sequence number.

And finally, the mobile terminal realizes normal communication with the network through the second base station.

Therefore, no matter the user terminal UE moves to a new cell without service or is switched to the new cell when service exists, the user terminal UE does not need to go to the core network again for authentication and authorization. The switching speed can be improved under the condition of ensuring safety, and meanwhile, the signaling pressure brought by the ultra-dense network to the core network is reduced.

Based on the above-mentioned switching control method in the ultra-dense network, the present embodiment provides a switching control device in the ultra-dense network, including:

In addition, it should be noted that, the working process of the switching control device based on the ultra-dense network provided in this embodiment is the same as the working process of the switching control method in the ultra-dense network, and specific reference may be made to the working process of the switching control method in the ultra-dense network, which is not described herein again.

Based on the above-mentioned handover control method in the ultra-dense network, the present embodiment provides a terminal device, which includes at least one processor (processor) 20; a display screen 21; and a memory (memory) 22, which may also include a communication interface (Communications Interface) 23 and a bus 24. Wherein the processor 20, the display 21, the memory 22 and the communication interface 23 may communicate with each other via a bus 24. The display screen 21 is configured to display a user guidance interface preset in the initial setting mode. The communication interface 23 may transmit information. The processor 20 may invoke logic instructions in the memory 22 to perform the methods of the embodiments described above.

Further, the logic instructions in the memory 22 described above may be implemented in the form of software functional units and stored in a computer readable storage medium when sold or used as a stand alone product.

The memory 22, as a computer readable storage medium, may be configured to store a software program, a computer executable program, such as program instructions or modules corresponding to the methods in the embodiments of the present disclosure. The processor 20 performs functional applications and data processing, i.e. implements the methods of the embodiments described above, by running software programs, instructions or modules stored in the memory 22.

The memory 22 may include a storage program area that may store an operating system, at least one application program required for functions, and a storage data area; the storage data area may store data created according to the use of the terminal device, etc. In addition, the memory 22 may include high-speed random access memory, and may also include nonvolatile memory. For example, a plurality of media capable of storing program codes such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or a transitory storage medium may be used.

A computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of:

The present invention improves the authentication and handover procedures by providing an independent control base station cBS. Utilizing the large coverage and broadcast capabilities of cBS and introducing cBS an assigned activation code to each access terminal. The activate code mechanism pushes the trust chain from the core network to cBS, which can be pushed further to the base station. When the user terminal is frequently moved and switched in the ultra-dense network, the user access security assurance and the switching control are rapidly, efficiently and safely completed.

It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.

Claims

1. A method for controlling handover in an ultra-dense network, the method comprising:

establishing connection between a mobile terminal and a control base station based on a signaling message sent by the mobile terminal, wherein the mobile terminal generates the signaling message based on information of the base station;

detecting the state of the mobile terminal when switching the base station, selecting a base station switching mode based on the state of the mobile terminal when switching the base station, checking second connection data request information sent by the mobile terminal, and sending a data connection admission message to realize the communication of the mobile terminal service data if the second connection data request information contains an activation code meeting a preset standard, wherein the preset standard is that the activation code sent by the mobile terminal is identical to the special activation code of the mobile terminal;

The step of completing the access authentication of the mobile terminal to the core network based on the signaling message, and the step of generating the mobile terminal exclusive activation code comprises the following steps:

2. The handover control method in an ultra-dense network according to claim 1, wherein the mobile terminal establishing connection with the control base station based on the signaling message sent by the mobile terminal comprises:

3. The method for controlling handover in an ultra-dense network according to claim 1, wherein transmitting the generation parameter information of the mobile terminal-specific activation code to the mobile terminal comprises:

and the first base station sends the access authorization message and the generation parameter information of the mobile terminal exclusive activation code to the mobile terminal, wherein after receiving the access authorization message and the generation parameter information of the mobile terminal exclusive activation code, the first base station establishes a user plane context and sets the activation state of the user plane context.

4. The method for switching control in an ultra-dense network according to claim 3, wherein the checking the first connection data request information sent by the mobile terminal, if the first connection data request information includes an activation code meeting a preset standard, sending a data connection admission message, and implementing communication of service data of the mobile terminal includes:

the control base station checks the activation code in the first data connection request information, if the activation code is an activation code meeting a preset standard, the control base station sends a data connection admission message to the first base station to realize normal communication of service data, wherein the preset standard is that the activation code sent by the mobile terminal is the same as the activation code generated by the control base station, after receiving the data connection admission message, the first base station sets the user plane context of the corresponding mobile terminal to be in an activation state, after finishing setting, the first base station sends information capable of carrying out data communication to the mobile terminal, and after receiving the information capable of carrying out data communication, the mobile terminal realizes communication of service data through the first base station and a core network gateway.

5. The method for switching control in an ultra-dense network according to claim 4, wherein detecting a state of the mobile terminal when switching base stations, selecting a mode of switching base stations based on the state of the mobile terminal when switching base stations, and checking second connection data request information sent by the mobile terminal, and if the second connection data request information includes an activation code meeting a preset standard, sending a data connection admission message, and implementing communication of service data of the mobile terminal includes:

the control base station detects that the state when the mobile terminal is switched to the base station is that communication is not performed in the process that the mobile terminal moves to the cell of the second base station, data receiving and transmitting occur after the mobile terminal moves to the cell of the second base station, at this time, the mobile terminal is switched to the second base station by the first base station, the control base station selects to directly switch the base station, the control base station selects to switch the base station, the mode of selecting to switch the base station is checked, second data connection request information sent by the mobile terminal through the second base station is checked, and if the second data connection request information passes the check, the control base station selects to activate a user plane context to realize communication with service data of the second base station.

6. The method for switching control in an ultra-dense network according to claim 4, wherein detecting a state of the mobile terminal when switching base stations, selecting a mode of switching base stations based on the state of the mobile terminal when switching base stations, and checking second connection data request information sent by the mobile terminal, and if the second connection data request information includes an activation code meeting a preset standard, sending a data connection admission message, and implementing communication of service data of the mobile terminal includes:

7. The handover control method in an ultra-dense network according to claim 5, wherein the control base station detects that the state when the mobile terminal is handed over to the cell of the second base station is that no communication is being performed during the movement of the mobile terminal to the cell of the second base station, and when the mobile terminal has performed data transmission and reception after the movement of the mobile terminal to the cell of the second base station, the control base station selects a direct handover base station, the control base station selects a manner of switching base stations, and checks second data connection request information sent by the mobile terminal through the second base station, and if the second data connection request information passes the check, the control base station selects an active user plane context to implement communication of service data with the second base station, including:

8. The handover control method in an ultra-dense network according to claim 6, wherein the control base station detects that the state when the mobile terminal switches base stations is that the mobile terminal is ready to be switched to the second base station by the first base station while using data transmission and reception, the control base station selects a mode of switching base stations, checks that second data connection request information sent by the mobile terminal is received, and if the second data connection request information passes the check, the control base station selects to complete the handover preparation, and realizes communication of service data with the second base station, including:

9. The method for switching control in an ultra-dense network according to claim 4, wherein the step of periodically updating the activation code after the mobile terminal realizes the normal communication of the service data, and the step of periodically updating the activation code after the mobile terminal realizes the normal communication of the service data comprises: after the mobile terminal realizes normal communication of service data, the control base station updates the activation code at intervals, and sends the updated generation parameter information of the special activation code of the mobile terminal to the mobile terminal, and the mobile terminal recalculates the activation code after receiving the updated generation parameter information of the special activation code of the mobile terminal.

10. A switching control device in an ultra-dense network, comprising:

the control base station establishes a control surface context of the mobile terminal according to the access authorization message, and generates a special activation code of the mobile terminal in the process of establishing the control context;

11. A terminal device, comprising: a processor, a memory, and a communication bus, the memory having stored thereon a computer readable program executable by the processor;

the processor, when executing the computer readable program, implements the handover control method in an ultra dense network according to any one of claims 1-9.

12. A computer storage medium, the storage medium being a computer readable storage medium, wherein the computer storage medium stores a handover control program in an ultra-dense network, the handover control program in the ultra-dense network being for implementing the handover control method in the ultra-dense network according to any one of claims 1-9 when executed by a processor.