CN110677886B - Wireless communication access network switching scheduling method facing edge computing environment - Google Patents
Wireless communication access network switching scheduling method facing edge computing environment Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
- H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0077—Transmission or use of information for re-establishing the radio link of access information of target access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
Abstract
The invention relates to a wireless communication access network switching scheduling method facing to an edge computing environment, and belongs to the technical field of communication. According to the method, the redundant virtual access points are deployed to acquire the AP information in the channel in advance, so that the channel without the AP is prevented from being scanned, and the delay of scanning all unknown APs on the channel one by the terminal is reduced. Meanwhile, the safety of the detection stage is guaranteed by sensing the abnormity of the wireless channel in real time. Then, facing to the edge computing environment, according to the moving direction of the terminal, the distance between the terminal and the AP, the QoS service level of the AP, the RSSI value of the AP and other influence factors are comprehensively considered, the weight factor is set according to different scenes, and the most appropriate base station is recommended as a delivery point. The load balance of the access points is ensured while the channel scanning time delay is reduced.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a wireless communication access network switching scheduling method facing to an edge computing environment.
Background
With the continuous improvement of the intelligent degree of the transformer substation, the types of services to be accessed in the transformer substation are more and more, and the requirements of various services on the quality, the access position, the safety and the like of a communication network are different. Meanwhile, various types of terminals exist in the transformer substation, and the method specifically comprises the following steps: the system comprises a video monitoring terminal, an electric energy data acquisition terminal, a field intelligent operation and maintenance terminal and the like, wherein each terminal usually supports various types of services. Therefore, in order to change the repeated construction and complex operation and maintenance situation brought to the communication network by the disordered requirements of the intelligent substation service on network bandwidth, coverage, quality, access mode and the like, a safe, reliable and economic unified communication terminal access technology is urgently needed to be broken through.
In recent years, with the popularization of portable terminals and the development of mobile internet, the importance of a wireless access network is increasing, and WIFI is one of more advanced technologies applied in the field of WLAN communication. The wireless access point AP is mainly responsible for establishing an access network and communication between networks, and the terminal devices must establish association with the AP in order to communicate with each other. In a multi-service application scenario and a wireless communication environment of a smart grid, effective coverage and networking of wireless communication are not simple access point deployment work. The service terminal moves to cause signal weakening, and a seamless switching technology of the mobile service terminal needs to be supported to ensure service access communication. Therefore, it is necessary to complete more stable and sensitive seamless handover of the mobile service terminal within a limited time, and to ensure the goal of no power-off and low time delay of the mobile service during the handover process.
In order to understand the development situation of the existing seamless switching technology, the existing papers and patents are searched, compared and analyzed, and the following technical information with high relevance to the invention is screened out:
the technical scheme 1: patent No. CN108738098A patent of 'A method for seamless handover between WLAN multiple access points', relates to a method for seamless handover between WLAN multiple access points based on SDN virtualization technology, which is mainly completed by three steps: firstly, when a mobile terminal needs to execute AP switching, establishing multi-connection between an alternative AP and the mobile terminal; secondly, the SDN controller selects a most appropriate AP from the alternative APs as an AP to be switched, and after determining that the AP switching can be executed, the mobile terminal performs data transmission with the AP to be switched; thirdly, the mobile terminal keeps transmitting data packets with the original access service AP within a certain time, and then through SDN flow table control, the newly switched AP keeps transmitting the data packets and stops the communication of the original service AP, and one-time seamless switching is completed. The invention adopts the virtualization technology, thereby solving the problem that the network is easy to interrupt in the prior art and reducing the packet loss rate. But also results in the invention that the mobile terminal needs to establish connection with multiple alternative APs at the same time, thereby increasing the handoff delay.
The technical scheme 2 is as follows: patent No. CN108235395A patent "a method for implementing cross-channel roaming handover of wireless terminal in WLAN", relates to a method for cross-channel roaming handover of mobile terminal, which mainly comprises four steps: firstly, when a wireless terminal is connected in an initial WIFI mode, an SDN controller creates a unique virtual AP for the wireless terminal on a physical wireless access point AP, and the unique virtual AP is used for completing authentication and association processes of the wireless terminal and the virtual AP; secondly, when the SDN controller detects that the signal strength value of the wireless terminal is smaller than a threshold value, the controller sends a scanning request command to a neighbor AP of a physical AP connected with the wireless terminal. After receiving the command, the neighbor AP starts to monitor the data sent by the wireless terminal. After the monitoring is successful, the neighbor AP sends a scanning response message to the SDN controller; thirdly, after receiving the scanning response messages of all neighbor APs, the SDN controller selects one neighbor AP as a switching target AP and transfers the virtual AP corresponding to the wireless terminal from the original AP to the switching target AP; fourthly, the SDN controller commands the original AP to send a channel switching notice to the wireless terminal. And after receiving the channel switching announcement, the wireless terminal switches the channel of the wireless terminal to the channel of the target AP to complete the switching. The switching process time of the wireless terminal is greatly shortened, the aim of fast cross-channel roaming switching in the true sense is fulfilled, but the flow is too complex and the deployment is difficult.
Technical scheme 3: patent No. CN105657760A patent of WIFI seamless switching method based on neighbor graph algorithm relates to a WIFI seamless switching method, which is mainly completed through five steps: first, establishing a neighbor graph updated in real time, including: information such as an AP mark, an AP position, a working channel, maximum flow and the like; secondly, when the STA signal strength is weakened to a threshold value and a switching request is sent to the AP, screening out candidate APs through a primary decision, and acquiring an initial AP performance evaluation value sequence table of the candidate APs; thirdly, scanning the candidate AP by the STA in a mode of sending a probe request frame according to the initial AP performance evaluation value sequence table, and sending the RSSI of the scanned candidate AP and the response time of the probe request frame to the current AP; fourthly, the current AP carries out secondary decision according to the initial AP performance evaluation value, the RSSI of the AP and the response time of the detection request frame to obtain a target AP, and the target AP is notified to the STA; and fifthly, the current STA is connected to the target AP to complete seamless switching. The invention reduces the number of scanning channels and the time for scanning each channel, greatly accelerates the scanning speed, but needs to record a large amount of data and simultaneously ensures the real-time update of information.
Therefore, how to overcome the deficiencies of the prior art is a problem to be solved in the field of communication technology.
Disclosure of Invention
The invention aims to solve the defects of the prior art and researches a wireless communication network switching and scheduling method in a transformer substation scene. Aiming at the problem of signal attenuation of a service mobile terminal in the environment of a wireless communication network and an access network in the moving process, the invention utilizes a seamless switching strategy of the wireless communication access network facing to the edge computing environment to complete the switching and base station delivery of the wireless network. By deploying redundant 'sentinels', i.e., virtual access points 'actively scan' channels, relevant information from physical APs is received, thereby fundamentally reducing the time delay of the detection scanning stage. Meanwhile, based on the core content of the edge calculation, the most appropriate AP is recommended as a delivery point according to the signal strength, the distance between the terminal and the AP and other indexes by judging the moving direction of the service terminal, so that the efficiency of the traditional switching mechanism is improved, the switching delay is optimized while the overload of the access point is prevented, and the load balance is guaranteed.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a wireless communication access network switching scheduling method facing to edge computing environment comprises the following steps:
step (1), suggesting a virtual AP, actively intercepting beacon frames periodically sent by all physical APs in other channels by adopting the virtual AP, and storing the intercepted and obtained information;
step (2), the virtual AP exchanges information with the neighbor AP, and then the current AP sends the information obtained by the exchange to the terminal connected with the current AP in a beacon frame mode;
and (3) when the terminal is disconnected with the currently connected AP due to movement to trigger switching, the terminal calculates the distance between the terminal and the AP according to the AP information collected in advance and acquires the channel number of the neighbor AP, so that the terminal only needs to scan a corresponding channel without scanning an empty channel.
Further, it is preferable that the beacon frame includes: network parameter information, geographical location information, QoS service level information, and operating channel number of the AP.
Further, it is preferable that, when the AP broadcasts the beacon frame to the outside for the terminal to access, the AP is selectively deployed as a sentinel, senses the wireless channel abnormality in real time, and finds and suppresses the illegal AP.
Further, preferably, the method for selecting the target AP for handover during handover is as follows:
suppose that at time t, the location of the terminal is: (
) Of 1 atiAn AP, i.e
In the position of
) By using
Presentation terminal and
the distance between them is:
defining: variables of
As weighting factors and specified as follows：
For a complete WiFi handover scheduling process, the final decision result is as follows:
wherein the content of the first and second substances,
to represent
The QoS traffic service class of (a) is,
to represent
A signal strength RSSI value of;
a variable parameter representing the relative distance is indicated,
a variable parameter indicative of a QoS service class,
a variable parameter representing the received signal strength RSSI;Nis the total number of APs.
Final decision result
Selecting according to the sequence from big to small
The AP with the maximum value is used as a target AP for terminal switching; network for storing target AP by AP currently associated with terminalParameter information; when the signal strength of the terminal and the currently associated AP continuously decreases until the signal strength is lower than the RSSI threshold value, the currently associated AP sends the related information of the target AP to the terminal, and the terminal sends an association request to the optimal target AP to complete one switching.
Compared with the prior art, the invention has the beneficial effects that:
aiming at the problem of signal attenuation of a service mobile terminal in the moving process in the environment of a wireless communication network and the importance of a seamless switching technology in the wireless access network, the invention utilizes a wireless network seamless switching method to complete the switching and base station delivery of the wireless communication network. Firstly, a safe and rapid pre-dynamic scanning mechanism based on a sentry (virtual AP) is provided, AP information in a channel is obtained in advance by deploying a redundant virtual access point, the channel without the AP is prevented from being scanned, and the delay of scanning all unknown APs on the channel one by a terminal is reduced. Meanwhile, the safety of the detection stage is guaranteed by sensing the abnormity of the wireless channel in real time. Then, facing to the edge computing environment, according to the moving direction of the terminal, the distance between the terminal and the AP, the QoS service level of the AP, the RSSI value of the AP and other influence factors are comprehensively considered, the weight factor is set according to different scenes, and the most appropriate base station is recommended as a delivery point. The load balance of the access points is ensured while the channel scanning time delay is reduced. Specifically, the full channel scan algorithm needs to scan all 13 channels in turn, so its total detection delay is the highest; selective channel scanning only needs to scan 3 channel algorithms of 1,6 and 11, so that the detection time delay is inferior; the advanced dynamic scan proposed by the present invention minimizes its total probe delay since it does not scan empty channels and acquires the relevant AP information before the handover trigger.
Drawings
FIG. 1 is a redundant sentinel deployment model;
FIG. 2 is a flow chart of the method of the present invention;
fig. 3 is a diagram of AP decision results.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention. The examples do not specify particular techniques or conditions, and are performed according to the techniques or conditions described in the literature in the art or according to the product specifications. The materials or equipment used are not indicated by manufacturers, and all are conventional products available by purchase.
It is considered that the handover delay depends largely on the delay taken for channel scanning. The idea of "break before connect" adopted by 802.11 greatly limits the improvement of handover performance, and brings serious delay and uncertainty to the handover process. Therefore, the invention adopts a safe rapid pre-dynamic scanning mechanism based on a sentinel based on the idea of neighbor request messages in IEEE802.11k, as shown in FIG. 1.
Before the mobile terminal gradually moves near the edge of the coverage area, so that the RSSI is lower than the threshold value to trigger the handover, a redundant "sentinel" deployed in the channel, that is, the virtual AP actively listens to the Beacon frame Beacon periodically transmitted from all the physical APs in the remaining channels, which includes: network parameter information, geographical position information, QoS service level information, working channel number and the like of the AP, and a cache mechanism is set to store the acquired AP information. Then, the sentinel exchanges information with its neighbor APs, so that the access point can not only acquire the working channel set of its neighbor APs, but also acquire as much AP information as possible. And then, the access point delivers the acquired other AP information to the connected terminal in a Beacon frame Beacon mode, so that the terminal knows which channels exist around.
When the terminal is disconnected with the currently connected AP due to movement to trigger switching, the terminal calculates the distance between the terminal and the AP according to the AP information collected in advance and acquires the channel number of the neighbor AP, so that the terminal only needs to scan a corresponding channel without scanning an empty channel.
In addition, when the AP broadcasts the beacon frame to the outside for the terminal to access, if the illegal AP obtains the SSID and BSSID broadcasted by the legal AP to the outside by sniffing, the legal terminal is at risk of being hijacked. At the moment, the sentinel mechanism can sense the wireless channel abnormity in real time by selectively deploying part of the APs as the sentinels, find the illegal APs and inhibit the illegal APs.
A detailed flow chart of the security rapid pre-dynamic scanning mechanism based on the sentinel is shown in fig. 2.
In addition to the handover mechanism, seamless handover also needs to solve another problem, namely the target AP of handover, i.e. the handover scheduling policy. Generally, the factor that most affects the link performance is the value of the signal strength RSSI. However, simply selecting the AP with the stronger RSSI as the handover target may cause that most terminals concentrate on the AP with the strongest RSSI, so that the AP with relatively poor signal but better service capability is in an idle state, thereby affecting the QoS guarantee of the mobile terminal user. Based on the method, a multi-attribute judgment model is introduced, and the moving direction, the geographic position, the service type, the QoS service level and the RSSI value of the terminal are comprehensively considered to select an optimal AP for delivery.
Multi-attribute decision model:
on the basis of decision information, a decision method of a multi-attribute utility theory is generally based on a quantized attribute evaluation value after attribute weight regression-transformation, and by a utility function of the decision method:
generating a comprehensive evaluation index based on
The value of (a) results in a decision scheme. Wherein the content of the first and second substances,La set of alternative decision-making schemes is represented,Ma set of multiple attributes representing each alternative decision scheme. And the utility function represents the advantages and disadvantages of each alternative decision scheme under the condition of the same attribute. The decision criteria are different for different forms of decision problems.
Are the respective weight values for the attribute j,
is the attribute value of attribute j in the ith decision scheme.
The "sentinel" actively listens during the scanning phase to obtain its own information periodically broadcast by all APs, as shown in table 1 below. When the terminal triggers switching in the moving process, the switching scheduling module carries out initial decision according to the latest geographic position and service level information of the access point.
TABLE 1 AP information Table
Distance between the mobile terminal and the access point:
suppose that at time t, the location of the terminal is: (
) The ith AP, i.e.
In the position of
) By using
Presentation terminal and
the distance between them is:
QoS service class of access point:
by using
To represent
QoS traffic service class of. Obviously, an AP located closer to the terminal will generally have better capability to provide services than an AP located farther away. In WLAN, the distance between the terminal and the AP should be within hundred meters, and meanwhile, setting the QoS service level to be a number between 0 and 10, the QoS service level of 0 indicates denial of service. Considering the influence of the difference between the orders of magnitude on the calculation, the pair is needed
Do some treatment, i.e. use
To represent a factor related to distance.
In addition, the "sentinel" receives Beacon frames Beacon periodically transmitted from all the APs of the 13 channels including RSSI values of the respective APs at idle, and completes the storage.
Defining: variables of
As weighting factors and specifying
。
A variable parameter representing the relative distance is indicated,
a variable parameter indicative of a QoS service class,
represents a variable parameter of received signal strength RSSI. The handover decision is shown in equation (3) below:
for a complete WiFi handover scheduling process, the final decision result is as follows:
wherein the content of the first and second substances,
and the dynamic decision can be made according to different application service types. Final decision result
Selecting according to the sequence from big to small
The largest value AP serves as a target AP for terminal handover (i.e., an optimal AP). And the AP currently associated with the terminal stores the network parameter information of the target AP. When the signal strength of the terminal and the current associated AP continuously decreases until the signal strength is lower than the RSSI threshold value, the current associated AP sends the related information of the optimal AP decided by the switching scheduling strategy to the terminal, and the terminal sends an association request to the optimal target AP to complete one-time switching.
The invention avoids scanning the channel without AP by deploying redundant sentinels, and reduces the delay of scanning all unknown APs on the channel one by the terminal. Meanwhile, the wireless channel abnormity is sensed in real time, and the safety of the detection stage is guaranteed. An optimized WIFI switching strategy combined with edge calculation is designed, the distance between a terminal and an AP, the QoS service level of the AP and the RSSI value of the AP are comprehensively considered, and load balance is guaranteed.
The present invention proposes numerical results to verify the performance of the proposed scheme. In the simulation, it is assumed that there are 5 arbitrary APs and relevant parameter values based on distance, QoS service level, and RSSI are set, as shown in table 2 below.
TABLE 2 AP information simulation parameter Table
Based on equation 4, set
The values of (a) are in order:
、
and
the AP decision result pairs for the three cases of distance first, QoS service level and only RSSI value are obtained as shown in fig. 3.
As shown in fig. 3, the value of Opt utility function represents the optimization result of the wireless communication access network handover scheduling policy for edge-oriented computing environment proposed in the present application. The larger the value of Opt, the better the performance of the scheduling policy and the more efficient the selection of APs. Therefore, the scheme of selecting the optimal AP by comprehensively considering parameter factors such as the distance between the terminal and the AP, the QoS service level of the AP, the RSSI value of the AP and the like has higher reliability than the delivered AP selected by only considering the signal strength of the AP. In addition, by comparing the utility function values in the case of the distance-first and QoS service class-first, the distance between the mobile terminal and the AP affects the selection of the best access point more than the QoS service class of the AP.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A wireless communication access network switching scheduling method facing to edge computing environment is characterized by comprising the following steps:
step (1), suggesting a virtual AP, actively intercepting beacon frames periodically sent by all physical APs in other channels by adopting the virtual AP, and storing the intercepted and obtained information;
step (2), the virtual AP exchanges information with the neighbor AP, and then the current AP sends the information obtained by the exchange to the terminal connected with the current AP in a beacon frame mode;
and (3) when the terminal is disconnected with the currently connected AP due to movement to trigger switching, the terminal calculates the distance between the terminal and the AP according to the AP information collected in advance and acquires the channel number of the neighbor AP, so that the terminal only needs to scan a corresponding channel without scanning an empty channel.
2. The edge computing environment-oriented wireless communication access network handover scheduling method of claim 1, wherein the beacon frame comprises: network parameter information, geographical location information, QoS service level information, and operating channel number of the AP.
3. The edge computing environment-oriented wireless communication access network switching scheduling method of claim 1, wherein when the AP broadcasts a beacon frame to the outside for the terminal to access, a part of the AP is selectively deployed as a sentinel, senses the wireless channel abnormality in real time, finds an illegal AP and suppresses the wireless channel abnormality.
4. The method of claim 1, wherein the target AP selection method for handover during handover is as follows:
suppose that at time t, the location of the terminal is: (
) Of 1 atiAn AP, i.e
In the position of
) By using
Presentation terminal and
the distance between them is:
defining: variables of
As a weighting factor, and specified as follows:
for a complete WiFi handover scheduling process, the final decision result is as follows:
wherein the content of the first and second substances,
to represent
The QoS traffic service class of (a) is,
to represent
A signal strength RSSI value of;
a variable parameter representing the relative distance is indicated,
a variable parameter indicative of a QoS service class,
a variable parameter representing the received signal strength RSSI;Nis the total number of APs;
final decision result
Selecting according to the sequence from big to small
The AP with the maximum value is used as a target AP for terminal switching; the AP currently associated with the terminal stores the network parameter information of the target AP; when the signal strength of the terminal and the currently associated AP continuously decreases until the signal strength is lower than the RSSI threshold value, the currently associated AP sends the related information of the target AP to the terminal, and the terminal sends an association request to the optimal target AP to complete one switching.
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| CN113676953A (en) * | 2020-05-15 | 2021-11-19 | 上海诺基亚贝尔股份有限公司 | Method and base station for UE selection for mobile load balancing of RAN network |
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| CN113873604B (en) * | 2021-09-14 | 2022-10-14 | 北京邮电大学 | WiFi6 wireless network switching method and device based on edge calculation |
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| WO2023137606A1 (en) * | 2022-01-19 | 2023-07-27 | Qualcomm Incorporated | Methods and apparatus for access point selection |
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