CN115209497A - Heterogeneous Internet of things terminal access method and system based on SDN - Google Patents

Heterogeneous Internet of things terminal access method and system based on SDN Download PDF

Info

Publication number
CN115209497A
CN115209497A CN202210825875.XA CN202210825875A CN115209497A CN 115209497 A CN115209497 A CN 115209497A CN 202210825875 A CN202210825875 A CN 202210825875A CN 115209497 A CN115209497 A CN 115209497A
Authority
CN
China
Prior art keywords
terminal
access
point
switching
priority
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210825875.XA
Other languages
Chinese (zh)
Inventor
王宇翱
郭永安
黄浩
吴庆鹏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Huian Juchuang Information Technology Co ltd
Original Assignee
Nanjing Huian Juchuang Information Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nanjing Huian Juchuang Information Technology Co ltd filed Critical Nanjing Huian Juchuang Information Technology Co ltd
Priority to CN202210825875.XA priority Critical patent/CN115209497A/en
Publication of CN115209497A publication Critical patent/CN115209497A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • 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
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0072—Transmission or use of information for re-establishing the radio link of resource information of target access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/20—Selecting an access point

Landscapes

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

Abstract

The invention discloses a heterogeneous Internet of things terminal access method and system based on an SDN network, wherein the method comprises the following steps: when there is a new terminal access request R i Then, arranging all the accessible AP points in ascending order from small to large according to the connection time delay, and selecting the AP point with the minimum connection time delay to execute the initial access application; if the application R is accessed i When the terminal is blocked during initial access, calculating switching cost according to the terminal side information and the network side information, and determining the priority of the terminal for dynamic load transmission according to the switching cost; performing load transfer to the terminal with the highest transfer priorityThe currently accessed AP sends a switching request and a target switching AP, and the target mobile terminal disconnects the access with the current AP after receiving the request and sends an access request to the target switching AP; and if the load transfer is successfully executed, accessing the newly arrived access application to the AP point moved out by the terminal. The method and the device reduce the switching cost of terminal access in the heterogeneous Internet of things and improve the access efficiency.

Description

Heterogeneous Internet of things terminal access method and system based on SDN
Technical Field
The invention relates to an SDN (software defined network) technology, in particular to a heterogeneous Internet of things terminal access method and system based on an SDN.
Background
With the development of the technology of the internet of things becoming faster and faster, the application scenes of the internet of things become wider and wider, so that the access equipment of the internet of things becomes more complex and the access efficiency is low. The existing wireless access technology has a contradiction between a coverage range and a transmission rate, the high rate depends on a high frequency band and a large bandwidth, and the characteristics of wireless transmission determine that the higher the frequency band is, the smaller the coverage range is, and the weaker the penetration capability is. Based on the overlapping coverage of the network and the flexibility of the multi-mode terminal, the access control system in the heterogeneous network can allocate an optimal network to the terminal according to the characteristics of the terminal (such as an H2H terminal or an M2M terminal), the characteristics of data transmission (such as sensitivity to time delay) and the characteristics of the access network, thereby ensuring better service quality. In this context, how to reasonably allocate access resources to achieve advantage complementation between different networks and how to coordinate and manage different networks so as to maximize utilization of system resources is a problem to be solved in a heterogeneous network scenario.
Disclosure of Invention
The invention aims to: in order to solve the problems in the prior art, the invention provides a heterogeneous internet of things terminal access method and system based on an SDN (software defined network), and the equipment access efficiency is improved.
The technical scheme is as follows: an SDN-based heterogeneous Internet of things terminal access method comprises the following steps:
when there is a new terminal access request R i In time, all AP points that the terminal can access are searched and marked as a set B (R) i ) Collecting the connection time delay of accessing each AP point, arranging all the accessible AP points in ascending order from small to large according to the connection time delay, and selecting the AP point with the minimum connection time delay to execute the initial access application;
if it is accessedPlease refer to R i When the terminal is blocked during initial access, calculating switching cost according to the terminal side information and the network side information, and determining the priority of the terminal for dynamic load transmission according to the switching cost;
taking a terminal with the highest transmission priority as a target mobile terminal, sending a switching request and a target switching AP point by an AP point currently accessed by the terminal, disconnecting the access with the current AP point after the target mobile terminal receives the request, sending an access request to the target switching AP point, and carrying out load transmission;
and if the load transfer is successfully executed, accessing the newly arrived access application to the AP point moved out by the terminal.
Further, selecting the AP point with the minimum connection delay to execute the initial access application includes: if the load of the selected AP point is smaller than the upper limit of the load of the AP point, the new access request is accepted, the access is successful, if the load of the selected AP point reaches the upper limit of the load of the AP point, the application is rejected, then the AP point with the next small access delay is tried to be accessed, and if all the AP points which can be accessed reject the access application, the initial access of the newly arrived access application fails.
Further, calculating the handover cost according to the terminal side information and the network side information includes:
the set of AP points that the terminal can access is denoted as B (R) i ) The number of elements in the set is denoted as N, B (R) i ) Each Ap point in the set collects information related to each terminal and priority evaluation, and the information is normalized to obtain a terminal-side normalized transfer cost vector
Figure BDA0003746561600000021
Wherein k represents the number of terminal side information which may affect the priority evaluation, and the terminal MTC i The normalized vector to be paid for switching to other AP points is recorded as
Figure BDA0003746561600000022
Wherein
Figure BDA0003746561600000023
Representing the cost for switching the ith terminal to the nth AP point, the calculation method of the switching cost function C is as follows:
Figure BDA0003746561600000024
wherein xi = [ xi ] 1 ,ξ 2 ,…,ξ k ] k The weight vectors of various terminal side normalization parameters which may influence the priority evaluation; r represents the weight occupied by the related normalization parameters of the network side; matrix S = [ S ] 1 ,s 2 ,…,s m ]S and s i ＝min(Q i ) And the minimum normalization cost of the network side to be born when the ith terminal is switched out is shown.
Further, the
Figure BDA0003746561600000025
The calculation method is as follows:
Figure BDA0003746561600000026
wherein
Figure BDA0003746561600000027
The state of the network side of the nth AP point to which the terminal is expected to switch; beta is a beta x Is that
Figure BDA0003746561600000028
The weight value of (1); l is the number of network side information that may affect the priority evaluation.
Further, determining the priority of the terminal for dynamic load delivery according to the handover cost includes: and determining the priority of the dynamic load transfer of the terminal by solving the value of the switching cost function C, wherein the higher the value of the switching cost function C is, the higher the cost for switching the terminal to the access of the specified AP point is, and the lower the priority of the dynamic load transfer is.
A heterogeneous Internet of things terminal access system based on an SDN (software defined network) comprises:
an initial access module for accessing the request R when a new terminal exists i In time, all AP points that the terminal can access are searched and marked as a set B (R) i ) Collecting the connection time delay of accessing each AP point, arranging all the accessible AP points in ascending order from small to large according to the connection time delay, and selecting the AP point with the minimum connection time delay to execute an initial access application;
a load transfer priority determination module for applying for R in the access i When the initial access is blocked, calculating switching cost according to the terminal side information and the network side information, and determining the priority of the terminal for dynamic load transmission according to the switching cost;
the load transfer execution module is used for taking a terminal with the highest transfer priority as a target mobile terminal, sending a switching request and a target switching AP point by an AP point currently accessed by the terminal, disconnecting the access with the current AP point after the target mobile terminal receives the request, sending an access request to the target switching AP point, and carrying out load transfer;
and the second access module is used for accessing the newly arrived access application to the AP point moved out by the terminal under the condition that the load transfer is successfully executed.
The present invention also provides a computer apparatus comprising:
one or more processors;
a memory; and
one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, which when executed by the processors implement the steps of the SDN network-based heterogeneous internet of things terminal access method as described above.
Has the beneficial effects that: for newly arrived access requests, the access points which can be accessed by the access requests are firstly arranged according to the ascending order of the access time delay from low to high, the access point with lower time delay is preferentially selected for access, and if the request is refused, the access point with higher time delay is selected for access. If all the accessible AP points reject the access requests, the access is blocked, at the moment, a transmission priority evaluation algorithm is triggered, the switching cost function values of all the connected equipment of the accessible AP points are calculated, the terminal with the lowest cost value, namely the highest transmission priority is selected to execute the switching step, then a new access application can access the AP point where the switching terminal leaves, and the equipment access efficiency in the heterogeneous Internet of things environment is facilitated.
Drawings
Figure 1 is a SDN network architecture diagram of the present invention;
fig. 2 is an overall flow chart of the access method of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in fig. 1, the present invention calculates the request access of the internet of things device by using a multi-domain architecture of the SDN network and an intelligent switch as a single-domain controller based on the SDN network architecture. Hereinafter, the internet of things device is also referred to as an internet of things terminal or simply a terminal.
The intelligent switch can carry out intelligent access according to the information such as position, qoS, time delay and the like. The invention refers to the intelligent switch as AP point, and records it as AP t (T =1,2, \ 8230; T), where T represents the number of all wireless access points in the entire area. The terminal access request is received by each AP, and each AP processes the access request under the control of the overall controller (the top-level device shown in fig. 1). The newly arrived access request is noted as R i Searching all AP points which can be accessed by the AP points and marking the set of the AP points as B (R) i ) And the number of the devices in the set is marked as N, and the elements in the set need to be arranged in ascending order according to the access delay, that is, the element with the shortest access delay is arranged at the top of the set. Suppose that the number of terminals that the current AP point has admitted is m, which are respectively denoted as MTC i (i =1,2, \8230m), the real-time load of the current access point is noted as C n Upper load limit is denoted as M n 。
For newly arrived access requests, the AP points which can be accessed by the newly arrived access requests are firstly arranged according to the ascending order of the access time delay from low to high, the AP point with lower time delay is preferentially selected for access, and if the request is refused, the AP point with higher time delay is selected for access. If all the accessible AP points reject the access requests, the access is blocked, at the moment, a transfer priority estimation algorithm is triggered, the switching cost function values of all the connected equipment of the accessible AP points are calculated, the terminal with the lowest cost value, namely the highest transfer priority is selected to execute the switching step, and then a new access application can access the AP point where the switching terminal leaves.
As shown in fig. 2, the specific steps include:
(1) The terminal reports the information regularly:
all terminals accessed in the whole system periodically report information of terminal sides influencing priority evaluation, such as own geographic position, moving speed, qoS (quality of service) requirements, connection delay, task completion condition and the like to the accessed AP points; for terminal access, the geographic position is considered, access can be faster according to the principle of proximity, the quality of service is considered, the terminal with larger QoS requirement can be connected to a more idle switch, and the like.
(2) Initial access:
the terminal initiates an access request to the switch, when a new access request reaches the switch, the initial access step is preferentially executed, namely all AP points which can be accessed by the terminal are searched, and the AP points are marked as a set B (R) i ) And collecting the connection time delay of accessing each AP point, and arranging all the accessible AP points in ascending order from small to large according to the connection time delay. And selecting the AP point with the minimum connection delay to execute the access application, and if the load of the current AP point is smaller than the upper limit of the load of the AP point, receiving a new access request and successfully accessing. If the load of the current AP point reaches the upper limit of the load of the AP point, the application is rejected, then the AP point with the next smaller access delay is tried, and so on. If all the accessible AP points reject the access application, the newly arrived access application fails to be initially accessed.
(3) Executing a delivery priority evaluation algorithm:
suppose access application R i If the AP is blocked during initial access, the set of AP points which can be accessed by the AP is marked as B (R) i ) The number of elements contained in the set is denoted as N. B (R) i ) Each AP in the set collects the geographical location, moving direction, moving speed, qoS requirements, connection of each terminal it admitsReceiving terminal side information influencing priority evaluation such as time delay, task completion condition and the like, and carrying out normalization processing on the information to obtain a terminal side normalized transfer cost vector
Figure BDA0003746561600000051
Figure BDA0003746561600000052
Where k represents the number of terminal-side information that may affect the priority evaluation. Terminal MTC i (i =1,2, \8230m) normalized vectors to be paid for switching to other AP points are recorded as
Figure BDA0003746561600000053
Wherein
Figure BDA0003746561600000054
The cost of switching the ith terminal to the nth AP point is represented by the following calculation method:
Figure BDA0003746561600000055
wherein
Figure BDA0003746561600000056
The state information of the network side is mainly the bandwidth use condition, the CPU use condition and the access resource use condition, and the same applies to the network side state of the nth AP point to which the terminal is expected to switch
Figure BDA0003746561600000057
Normalization processing is also needed; beta is a x Is that
Figure BDA0003746561600000058
Weight value of beta x E (0, 1); l is the number of network side information that may affect the priority evaluation.
The switching cost function C is calculated as follows:
Figure BDA0003746561600000059
wherein xi = [ xi ] 1 ,ξ 2 ,…,ξ k ] k The weight vectors of various terminal side normalization parameters which may influence the priority evaluation; r represents the weight occupied by the related normalization parameters of the network side; matrix S = [ S ] 1 ,s 2 ,…,s m ]And s is i ＝min(Q i ) And the minimum normalization cost of the network side to be born when the ith terminal is switched out is shown.
And determining the priority of the dynamic load transfer of the terminal by solving the value of the switching cost function C, wherein the higher the value of the switching cost function C is, the higher the cost for switching the terminal to the specified AP point is, and the lower the priority of the dynamic load transfer is. Therefore, the algorithm selects the load transfer terminal and the target AP point with the highest priority, namely the lowest cost, and executes the switching process, so that a new access application can be admitted, and the system access resources are more reasonably utilized.
(4) Dynamic load transfer is performed.
The method comprises the steps of executing load transfer to a terminal with the highest transfer priority, sending a switching request and a target switching AP point by an AP point which is currently accessed by the terminal, disconnecting the access to the current AP point after the target mobile terminal (namely the terminal with the highest transfer priority) receives the request, sending the access request to the target switching AP point, receiving the switched mobile terminal if the current load of the target switching AP point is smaller than the upper limit of the load, otherwise rejecting the request, re-executing the step (3) to find out load transfer operation with the next highest transfer priority when the load transfer fails, and failing to execute the switching if all the accessible AP points cannot execute the switching.
(5) And executing access by the newly arrived access application.
And (4) if the load transfer in the step (4) is successfully executed, accessing the newly arrived access application to the AP point where the terminal moves out, and if the load transfer in the step (4) is failed, accessing the newly arrived access application to the system.
The invention also provides a heterogeneous internet of things terminal access system based on the SDN, which comprises the following steps:
an initial access module for accessing the request R when a new terminal exists i In time, all AP points that the terminal can access are searched and marked as a set B (R) i ) Collecting the connection time delay of accessing each AP point, arranging all the accessible AP points according to the ascending order of the connection time delay from small to large, and selecting the AP point with the minimum connection time delay to execute the initial access application;
a load transfer priority determination module for applying for R in the access i When the initial access is blocked, calculating the switching cost according to the terminal side information and the network side information, and determining the priority of the terminal for dynamic load transmission according to the switching cost;
the load transfer execution module is used for taking a terminal with the highest transfer priority as a target mobile terminal, sending a switching request and a target switching AP point by an AP point currently accessed by the terminal, disconnecting the access with the current AP point after the target mobile terminal receives the request, sending an access request to the target switching AP point, and carrying out load transfer;
and the second access module is used for accessing the newly arrived access application to the AP point moved out by the terminal under the condition that the load transfer is successfully executed.
According to the embodiment of the invention, the step of selecting the AP point with the minimum connection delay by the initial access module to execute the initial access application comprises the following steps: if the load of the selected AP point is smaller than the upper limit of the load of the AP point, the new access request is accepted and the access is successful, if the load of the selected AP point reaches the upper limit of the load of the AP point, the application is rejected, then the AP point with the next small access delay is tried to be accessed, and if all the accessible AP points reject the access application, the initial access of the newly arrived access application fails.
According to the embodiment of the present invention, the load transfer priority determining module includes a handover cost calculating unit, configured to calculate the handover cost according to the terminal side information and the network side information, where the specific calculating method includes:
the set of AP points that the terminal can access is recorded as B (R) i ) The number of elements in the set is denoted as N, B (R) i ) Each Ap point in the set collects information related to each terminal and priority evaluation, and the information is normalized to obtain a terminal-side normalized transfer cost vector
Figure BDA0003746561600000071
Wherein k represents the number of terminal side information which may affect the priority evaluation, and the terminal MTC i The normalized vector to be paid for switching to other AP points is recorded as
Figure BDA0003746561600000072
Wherein
Figure BDA0003746561600000073
The cost of switching the ith terminal to the nth AP point is represented, and the calculation method of the switching cost function C is as follows:
Figure BDA0003746561600000074
wherein xi = [ xi ] 1 ,ξ 2 ,…,ξ k ] k The weight vectors of various terminal side normalization parameters which may influence the priority evaluation; r represents the weight occupied by the related normalization parameters of the network side; matrix S = [ S ] 1 ,s 2 ,…,s m ]S and s i ＝min(Q i ) And the minimum normalization cost of the network side to be born when the ith terminal is switched out is shown.
In accordance with an embodiment of the present invention,
Figure BDA0003746561600000075
the calculation of (c) is as follows:
Figure BDA0003746561600000076
wherein
Figure BDA0003746561600000077
Is to endThe terminal expects the network side state of the nth AP point to be switched to; beta is a x Is that
Figure BDA0003746561600000078
The weight value of (1); l is the number of network side information that may affect the priority evaluation.
According to the embodiment of the present invention, the load transfer priority determining module further includes a priority determining unit, configured to determine the priority of dynamic load transfer performed by the terminal according to the switching cost, and the specific method includes: and determining the priority of the dynamic load transfer of the terminal by solving the value of the switching cost function C, wherein the higher the value of the switching cost function C is, the higher the cost for switching the terminal to the access of the specified AP point is, and the lower the priority of the dynamic load transfer is.
According to the embodiment of the invention, the terminal side information comprises the geographic position, the moving direction, the moving speed, the QoS requirement, the connection delay and the task completion condition.
According to the embodiment of the invention, the network side state information comprises bandwidth use condition, CPU use condition and access resource use condition.
According to the embodiment of the present invention, the load transferring by the load transferring performing module specifically includes: if the current load of the target switching AP point is smaller than the upper limit of the load, the switched mobile terminal is received, otherwise, the request is refused, and when the load transfer fails, the load transfer operation with the second highest transfer priority is found out again.
The present invention also provides a computer apparatus comprising: one or more processors; a memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs when executed by the processors implement the steps of the SDN network-based heterogeneous internet of things terminal access method as described above.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The access requests are arranged in an ascending order from low to high based on the access time delay, the AP points with lower time delay are preferentially selected for access, and if the requests are rejected, the AP points with higher time delay are selected for access, so that the access timeliness is improved. If all the accessible AP points reject the access requests, the access is blocked, at the moment, a transmission priority evaluation algorithm is triggered, the switching cost function values of all the connected equipment of the accessible AP points are calculated, the terminal with the lowest cost value, namely the highest transmission priority is selected to execute the switching step, then a new access application can access the AP point where the switching terminal leaves, and the equipment access efficiency in the heterogeneous Internet of things environment is facilitated.

Claims (10)

1. A heterogeneous Internet of things terminal access method based on an SDN network is characterized by comprising the following steps:
when there is a new terminal access request R i In the process, all AP points which can be accessed by the terminal are searched and marked as a set B (R) i ) Collecting the connection time delay of accessing each AP point, arranging all the accessible AP points in ascending order from small to large according to the connection time delay, and selecting the AP point with the minimum connection time delay to execute the initial access application;
if the access request R i When the terminal is blocked during initial access, calculating switching cost according to the terminal side information and the network side information, and determining the priority of the terminal for dynamic load transmission according to the switching cost;
taking a terminal with the highest transmission priority as a target mobile terminal, sending a switching request and a target switching AP point by an AP point currently accessed by the terminal, disconnecting the access with the current AP point after the target mobile terminal receives the request, sending an access request to the target switching AP point, and carrying out load transmission;
and if the load transfer is successfully executed, accessing the newly arrived access application to the AP point moved out by the terminal.
2. The SDN-based heterogeneous Internet of things terminal access method of claim 1, wherein the step of selecting the AP point with the minimum connection delay to execute the initial access application comprises the steps of: if the load of the selected AP point is smaller than the upper limit of the load of the AP point, the new access request is accepted and the access is successful, if the load of the selected AP point reaches the upper limit of the load of the AP point, the application is rejected, then the AP point with the next small access delay is tried to be accessed, and if all the accessible AP points reject the access application, the initial access of the newly arrived access application fails.
3. The SDN-based heterogeneous Internet of things terminal access method of claim 1, wherein calculating the handover cost according to the terminal side information and the network side information comprises:
the set of AP points that the terminal can access is denoted as B (R) i ) The number of elements in the set is denoted as N, B (R) i ) Each AP point in the set collects information related to each terminal and priority evaluation received by each AP point, and the information is normalized to obtain a terminal side normalized transmission cost vector
Figure FDA0003746561590000011
Wherein k represents the number of terminal side information which may affect the priority evaluation, and the terminal MTC i The normalized vector to be paid for switching to other AP points is recorded as
Figure FDA0003746561590000012
Wherein
Figure FDA0003746561590000013
The cost of switching the ith terminal to the nth AP point is represented, and the calculation method of the switching cost function C is as follows:
Figure FDA0003746561590000014
Figure FDA0003746561590000021
wherein xi = [ xi ] 1 ，ξ 2 ，...，ξ k ] k The weight vectors of various terminal side normalization parameters which may influence the priority evaluation; r represents occupied by related normalization parameters at network sideA weight; matrix S = [ S ] 1 ，s 2 ，...，s m ]S and s i ＝min(Q i ) And the minimum normalization cost of the network side to be born when the ith terminal is switched out is shown.
4. The SDN-based heterogeneous Internet of things terminal access method according to claim 3, wherein the SDN-based heterogeneous Internet of things terminal access method
Figure FDA0003746561590000022
The calculation method of (c) is as follows:
Figure FDA0003746561590000023
wherein
Figure FDA0003746561590000024
The state of the network side of the nth AP point to which the terminal is expected to switch; beta is a x Is that
Figure FDA0003746561590000025
The weight value of (2); l is the number of network side information that may affect the priority evaluation.
5. The SDN network-based heterogeneous Internet of things terminal access method of claim 3, wherein the step of determining the priority of the terminal for dynamic load transfer according to the handover cost comprises the steps of: and determining the priority of the dynamic load transfer of the terminal by solving the value of the switching cost function C, wherein the higher the value of the switching cost function C is, the higher the cost for switching the terminal to the access of the specified AP point is, and the lower the priority of the dynamic load transfer is.
6. The SDN-based heterogeneous Internet of things terminal access method, according to claim 3, wherein the terminal side information comprises geographic position, moving direction, moving speed, qoS (quality of service) requirements, connection delay and task completion condition.
7. The SDN-based heterogeneous Internet of things terminal access method, according to claim 3, wherein the network side state information comprises bandwidth usage, CPU usage and access resource usage.
8. The SDN network-based heterogeneous internet of things terminal access method of claim 1, wherein the performing load transfer specifically includes: and if the current load of the target switching AP point is smaller than the upper load limit, receiving the switched mobile terminal, otherwise rejecting the request, and finding out the load transfer operation with the highest transfer priority again when the load transfer fails.
9. A heterogeneous Internet of things terminal access system based on an SDN is characterized by comprising:
an initial access module for accessing the request R when a new terminal exists i In the process, all AP points which can be accessed by the terminal are searched and marked as a set B (R) i ) Collecting the connection time delay of accessing each AP point, arranging all the accessible AP points in ascending order from small to large according to the connection time delay, and selecting the AP point with the minimum connection time delay to execute the initial access application;
a load transfer priority determination module for applying for R in the access i When the initial access is blocked, calculating the switching cost according to the terminal side information and the network side information, and determining the priority of the terminal for dynamic load transmission according to the switching cost;
the load transfer execution module is used for taking a terminal with the highest transfer priority as a target mobile terminal, sending a switching request and a target switching AP point by an AP point currently accessed by the terminal, disconnecting the access with the current AP point after the target mobile terminal receives the request, sending an access request to the target switching AP point, and carrying out load transfer;
and the second access module is used for accessing the newly arrived access application to the AP point moved out by the terminal under the condition that the load transfer is successfully executed.
10. There is provided a computer device characterized by comprising:
one or more processors;
a memory; and
one or more programs, wherein the one or more programs are stored in the memory and configured for execution by the one or more processors to perform the steps of the SDN network-based heterogeneous internet of things terminal access method of any one of claims 1-8 when executed by the processors.
CN202210825875.XA 2022-07-14 2022-07-14 Heterogeneous Internet of things terminal access method and system based on SDN Pending CN115209497A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210825875.XA CN115209497A (en) 2022-07-14 2022-07-14 Heterogeneous Internet of things terminal access method and system based on SDN

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210825875.XA CN115209497A (en) 2022-07-14 2022-07-14 Heterogeneous Internet of things terminal access method and system based on SDN

Publications (1)

Publication Number Publication Date
CN115209497A true CN115209497A (en) 2022-10-18

Family

ID=83580656

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210825875.XA Pending CN115209497A (en) 2022-07-14 2022-07-14 Heterogeneous Internet of things terminal access method and system based on SDN

Country Status (1)

Country Link
CN (1) CN115209497A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116599687A (en) * 2023-03-15 2023-08-15 中国人民解放军61660部队 Low-communication-delay cascade vulnerability scanning probe deployment method and system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116599687A (en) * 2023-03-15 2023-08-15 中国人民解放军61660部队 Low-communication-delay cascade vulnerability scanning probe deployment method and system
CN116599687B (en) * 2023-03-15 2023-11-24 中国人民解放军61660部队 Low-communication-delay cascade vulnerability scanning probe deployment method and system

Similar Documents

Publication Publication Date Title
EP3403180B1 (en) User equipment selection for mobile edge computing
US12063559B2 (en) Method and apparatus for complementary and equivalent network slice deployment in a network environment
US12133124B2 (en) Migration of computing information between edge computing devices
US11917480B2 (en) Traffic management for wireless communication network
WO2016180182A1 (en) Service package recommendation method and device
TW202110223A (en) Conditional configuration in a wireless communication network
CN115086331B (en) Cloud equipment scheduling method, device and system, electronic equipment and storage medium
CN115209497A (en) Heterogeneous Internet of things terminal access method and system based on SDN
CN108834177A (en) Load-balancing method, device, computer equipment and storage medium
US20240272928A1 (en) Method and system for remote execution of services requested by a mobile device via a cellular communication network
EP3942782B1 (en) Management for managing resource allocation in an edge computing system
CN115242798A (en) Task scheduling method based on edge cloud, electronic equipment and storage medium
CN106936926A (en) Access the method and system of back end
US11930399B2 (en) Method, device and system for implementing edge computing
CN114245288A (en) Task scheduling method of service equipment, service equipment and storage medium
CN114047965A (en) Computation offloading method, satellite server, and computer-readable storage medium
CN109600432A (en) Content center moves edge network user dynamic access method
CN107509223B (en) Method and device for constructing virtual cell
US12041507B2 (en) Cellular network user device mobility optimization management
CN109819482A (en) A kind of data processing method and device
EP3048822B1 (en) Mobility management method, device, system and computer storage medium
Kong et al. ARISE: High-Capacity AR Offloading Inference Serving via Proactive Scheduling
CN114070496B (en) Uplink transmission method, device and base station for carrier aggregation
CN113271217B (en) Communication method, device and system
US20230388828A1 (en) Estimating signal propagation based on sampling by user equipment in idle mode

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination