CN114007250B - Multi-mobile-network access selection method for railway application - Google Patents
Multi-mobile-network access selection method for railway application Download PDFInfo
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- CN114007250B CN114007250B CN202111639558.0A CN202111639558A CN114007250B CN 114007250 B CN114007250 B CN 114007250B CN 202111639558 A CN202111639558 A CN 202111639558A CN 114007250 B CN114007250 B CN 114007250B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/18—Selecting a network or a communication service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/06—Testing, supervising or monitoring using simulated traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
Abstract
The invention discloses a railway-application-oriented multi-mobile-network access selection method, which is characterized in that on one hand, the characteristic of railway travel route fixation is utilized, the prior data of the service quality of each line is obtained through sampling, the prior data is utilized to generate an access selection strategy, the generated access selection strategy has pre-judgment performance, the line degradation can be processed in advance, and the effect of multi-link comprehensive application is effectively improved on the whole. On the other hand, the whole service quality of each link is estimated through the prior data, so that different access selection strategies such as low time delay, high reliability, high throughput rate and the like can be customized according to different service requirements, the effect of multi-link comprehensive application is effectively improved for a single service, and the availability and effectiveness of the multi-link are improved.
Description
Technical Field
The invention relates to the technical field of rail transit communication, in particular to a multi-mobile-network access selection method for railway application.
Background
The access selection method has the advantages that when the terminal equipment is provided with a plurality of communication links with different communication qualities, the optimal link is selected through the access selection method, the terminal can comprehensively utilize the plurality of communication links better through the excellent access selection method, and the communication performance of the terminal is guaranteed through reasonable link selection.
At present, the selection of multilinks on a train is a method of utilizing real-time link quality detection, the state (network service quality) of each communication link is continuously monitored by technical means such as heartbeat packets and the like in the running process of equipment, when the state index of the current communication link is found to be lower than a preset threshold value, the communication link with a normal state is selected to be switched to, and the state transition logic is as shown in fig. 1. The state of the communication link generally includes: communication delay, packet loss rate, etc.
However, the above-mentioned solutions have the drawbacks that:
1) the communication link switching logic switches when the current link is found to be abnormal, but the link abnormality is found in a process, namely, a threshold value required by link quality and a threshold value required by abnormality duration are both provided, the link switching is not timely due to overlong setting of the process, and the link has an abnormal state for a long time, so that the switching action is delayed; the link switching is too frequent due to the short setting of the process, the link is unstable, some connection-based services need to be reconnected during the link switching, and the services cannot work normally due to the too frequent switching.
2) The special operation environment of the railway is not utilized, and the optimization is not carried out aiming at the railway service.
3) The communication link selection mode is single, and a targeted link selection strategy is not provided for different service requirements, such as different service requirements of high reliability, low time delay, high throughput rate and the like.
Disclosure of Invention
The invention aims to provide a railway-application-oriented multi-mobile-network access selection method, which can provide a network access strategy more meeting the requirements of different railway services according to the different railway services, and the generated access selection strategy has prejudgement performance, can be processed in advance aiming at the line degradation, and can effectively improve the effect of multi-link comprehensive application on the whole.
The purpose of the invention is realized by the following technical scheme:
a railway application-oriented multi-mobile network access selection method comprises the following steps:
sampling and counting the network service quality of each communication link of each line, and forming a line network service quality prior model based on railway kilometer posts;
in the running process of the train, based on a line network service quality prior model, for a given service load and different demand models, a corresponding access selection strategy is generated in advance, and a corresponding communication link is accessed according to the access selection strategy.
According to the technical scheme provided by the invention, on one hand, the characteristic that the railway advancing route is fixed is utilized, the prior data of the service quality of each line is obtained through sampling, the prior data is utilized to generate the access selection strategy, the generated access selection strategy has pre-judgment performance, the line degradation can be processed in advance, and the effect of comprehensive utilization of multiple links is effectively improved on the whole. On the other hand, the whole service quality of each link is estimated through the prior data, so that different access selection strategies such as low time delay, high reliability, high throughput rate and the like can be customized according to different service requirements, the effect of multi-link comprehensive application is effectively improved for a single service, and the availability and effectiveness of the multi-link are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic diagram of a communication link switching logic in the prior art according to the background of the present invention;
fig. 2 is a flowchart of a multi-mobile-network access selection method for railway application according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a multi-mobile-network access selection method for railway application according to an embodiment of the present invention;
fig. 4 is a flowchart of generating a prior model of the line network quality of service according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The terms that may be used herein are first described as follows:
the terms "comprising," "including," "containing," "having," or other similar terms in describing these terms are to be construed as non-exclusive inclusions. For example: including a feature (e.g., material, component, ingredient, carrier, formulation, material, dimension, part, component, mechanism, device, step, process, method, reaction condition, processing condition, parameter, algorithm, signal, data, product, or article, etc.) that is not specifically recited, should be interpreted to include not only the specifically recited feature but also other features not specifically recited and known in the art.
The following describes a railway-application-oriented multi-mobile-network access selection method in detail. Details which are not described in detail in the embodiments of the invention belong to the prior art which is known to the person skilled in the art. Those not specifically mentioned in the examples of the present invention were carried out according to the conventional conditions in the art or conditions suggested by the manufacturer. The reagents or instruments used in the examples of the present invention are not specified by manufacturers, and are all conventional products available by commercial purchase.
As shown in fig. 2, a multi-mobile-network access selection method for railway application mainly includes the following steps:
And 2, in the running process of the train, generating a corresponding access selection strategy in advance for a given service load and different demand models based on a line network service quality prior model, and accessing a corresponding communication link according to the access selection strategy.
The main principle of the scheme of the embodiment of the invention is as follows: the method is characterized in that a running line of a train is fixed and predictable as a base point, and a network service quality prior model of the line is formed on the basis of railway kilometer marks by sampling and counting the service quality of links along the railway. And forming a line selection strategy matched with the service requirement based on the prior model of the network service quality of each link under the line and the network performance requirement models of different services. Finally, in practical application, different routing strategies may be implemented on the line for different services, and the overall flow is shown in fig. 3.
For ease of understanding, the following description is directed to a preferred embodiment of the two steps described above.
Firstly, a line network service quality prior model is generated.
In the embodiment of the invention, the association of three elements, namely network load, kilometer posts and service quality, is completed by sampling the quality of a communication link of an actual line; specifically, the method comprises the following steps: each line is grouped according to network load, the network service quality of each communication link under different network loads is sampled and counted, a kilometer post is taken as a sequence reference, and finally a network service quality prior model based on the kilometer post of each communication link under different load conditions is formed.
Illustratively, the network load under a line is divided into 100kb, 500kb, 1Mb and 10Mb, the network service quality (communication success rate and time delay) of three communication links of mobile, connected and telecommunication are respectively tested, and a kilometer mark element is added, finally, under the network load of 100kb, 500kb, 1Mb and 10Mb of the line, the mobile, connected and telecommunication networks are based on a kilometer mark network service quality model, and the related flow is shown in fig. 4.
And secondly, generating a corresponding access selection strategy in advance.
In the embodiment of the invention, based on the prior model of the service quality of the line network, the service quality data under different loads of each communication link are correspondingly arranged according to the kilometer post, and a corresponding access selection strategy is generated in advance for a given service load and different demand models. The access selection policy comprises: specific communication links to be accessed at different kilometer posts.
Demand models are classified into three types: low time delay, high reliability and high throughput rate; for a given traffic load and the three types of demand models described above, the communication links that need to be selected are determined:
the low time delay means that the communication time delay is less than the set requirement; under the condition of service load, selecting a link with the most stable communication quality (communication delay and packet loss rate) (namely the smallest communication quality change) from a plurality of communication links with communication delay meeting service requirements for a long time;
the high reliability means that the packet loss rate is less than the set requirement; under the condition of service load, a communication link with the lowest packet loss rate is selected from the plurality of communication links, and when the packet loss rate of the currently used communication link fluctuates but the fluctuation range does not exceed the set range, the currently used communication link is maintained to be used, so that unnecessary switching is reduced.
The high throughput rate means that the throughput per unit time meets the set requirement; and in the case of selecting the highest load, selecting the communication link with the lowest packet loss rate from the plurality of communication links.
In the embodiment of the invention, the specific setting requirements for time delay, reliability and throughput can be set according to actual conditions or experience, and the setting requirements specified by the current industry can be directly used.
By the method, the targeted access selection strategies can be generated for different services, the access strategies can be matched with the actual network environment of the line, the network environment of each line in front can be predicted and processed in advance, and the hysteresis of line quality monitoring is avoided.
Of course, the above solution of the present invention can be combined with the prior art described in the foregoing background, namely: the access selection strategy generated in advance by the invention is used as a reference strategy, the network service quality of each communication link is monitored in real time in the running process of the train, and when the index of the network service quality of the currently accessed communication link is lower than a preset threshold value, the other communication links of which the index of the network service quality is not lower than the preset threshold value are switched to, so that the link prediction error caused by the change of the line network environment or sudden network interference is avoided.
Through the description of the above embodiments, it is clear to those skilled in the art that the above embodiments may be implemented by software, or by software plus a necessary general hardware platform. With this understanding, the technical solutions of the embodiments can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a usb disk, a removable hard disk, etc.), and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods according to the embodiments of the present invention.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (2)
1. A multi-mobile network access selection method for railway application is characterized by comprising the following steps:
sampling and counting the network service quality of each communication link of each line, and forming a line network service quality prior model based on a railway kilometer post, wherein the method comprises the following steps: each line is grouped according to network load, the network service quality of each communication link under different network loads is sampled and counted, a kilometer post is taken as a sequence reference, and finally a network service quality prior model based on the kilometer post of each communication link under different load conditions is formed;
in the running process of a train, based on a line network service quality prior model, correspondingly arranging service quality data under different loads of each communication link according to kilometer posts, generating a corresponding access selection strategy in advance for a given service load and different demand models, and accessing the corresponding communication link according to the access selection strategy;
for a given traffic load and different demand models, pre-generating a corresponding access selection policy comprises:
demand models are classified into three types: low time delay, high reliability and high throughput rate; for a given traffic load and the three types of demand models described above, the communication links that need to be selected are determined:
the low time delay means that the communication time delay is less than the set requirement; under the condition of service load, selecting a link with the most stable communication quality from a plurality of communication links with communication time delay meeting service requirements;
the high reliability means that the packet loss rate is less than the set requirement; under the condition of service load, selecting a communication link with the lowest packet loss rate from the plurality of communication links, and maintaining to use the communication link which is currently used when the packet loss rate of the communication link which is currently used fluctuates but the fluctuation range does not exceed the set range;
the high throughput rate means that the throughput per unit time meets the set requirement; and in the case of selecting the highest load, selecting the communication link with the lowest packet loss rate from the plurality of communication links.
2. The method for selecting multi-mobile network access for railway application according to claim 1, further comprising: and taking a pre-generated access selection strategy as a reference strategy, monitoring the network service quality of each communication link in real time in the running process of the train, and switching to other communication links of which the network service quality index is not lower than a preset threshold value when the network service quality index of the currently accessed communication link is lower than the preset threshold value.
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| CN106656847A (en) * | 2017-03-10 | 2017-05-10 | 重庆邮电大学 | Software defined network (SDN) load balancing method with highest network utility |
| CN113347675A (en) * | 2021-05-14 | 2021-09-03 | 华中科技大学 | Network switching method and network switching device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9100852B2 (en) * | 2012-05-15 | 2015-08-04 | Futurewei Technologies, Inc. | System and method for network detection and selection |
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| CN105430694A (en) * | 2015-11-02 | 2016-03-23 | 广东欧珀移动通信有限公司 | Mobile network switching method and device |
| CN106656847A (en) * | 2017-03-10 | 2017-05-10 | 重庆邮电大学 | Software defined network (SDN) load balancing method with highest network utility |
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