CN102869065B - Rapid route updating method for rail traffic communication system based on WLAN (wireless local area network) - Google Patents
Rapid route updating method for rail traffic communication system based on WLAN (wireless local area network) Download PDFInfo
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- CN102869065B CN102869065B CN201110190026.3A CN201110190026A CN102869065B CN 102869065 B CN102869065 B CN 102869065B CN 201110190026 A CN201110190026 A CN 201110190026A CN 102869065 B CN102869065 B CN 102869065B
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Abstract
The invention discloses a rapid route updating method for a rail traffic communication system based on a WLAN (wireless local area network). The rapid route updating method comprises the following steps: step1. in the forward process of a train, after a vehicle-mounted STA (single threaded apartment ) switches from a trackside AP (access point) to another trackside AP, the trackside AP newly connected can immediately obtain the MAC (media access control) address of the vehicle-mounted STA, then the massage containing the MAC address of the vehicle-mounted STA is sent to a trackside server; and step 2. after the trackside server receives the massage containing the MAC address of the vehicle-mounted STA, the content of the massage is analyzed, if the MAC address of the vehicle-mounted STA conforms to the standard of the MAC address of the internet, the MAC address replies the correct responding message, and a routing table of the server is immediately updated; if not, the inaccurate responding message returns. According to the rapid route updating method for the rail traffic communication system based on the WLAN, a static route is adopted, and the temporarily interrupt of the internet, which is caused by the dynamic routing convergence time during the switching of the STA and the trackside AP is avoided.
Description
Technical field
Wireless communication technology field of the present invention, relates to a kind of quick route renewing method of the track traffic communication system based on WLAN.
Background technology
The advantages such as WLAN communication is free with its high bandwidth, communication, networking flexibility obtain applying more and more widely.In track traffic, use WLAN technology achieves the broadband connections between train and trackside.STA placed by the train of track traffic, places AP in orbit.After STA and trackside AP connects, just can realize the data communication between train and trackside.The system configuration of the existing track traffic communication system based on WLAN as shown in Figure 1, comprises ground application system, trackside system and onboard system; Described ground application system comprises service centre, and multiple trackside system is served in its unified management.Described trackside system mainly comprises trackside server and the AP along track spaced set.Described onboard system mainly comprises onboard servers and is separately positioned on the STA of headstock and the tailstock.Train is in running, and vehicle-mounted STA communicates with trackside AP, and then on-vehicle information and terrestrial information is carried out alternately.
In present applications ' the tail must be taken, the technology employing WLAN mesh network connects and communicates.WLAN mesh network is a kind of a kind of novel Wireless Network developing out based on WLAN, and its Wireless mesh technology redefines WLAN technology, based on 802.11 technology without the need to license, allows operator to increase wireless broadband services; Meanwhile, wireless and optimum performance feature that is wireline solutions is also combined, for enterprise and public terminals user provide reliable wireless access.In addition, WLAN mesh technology also introduces the concept of reciprocity mesh topology, to realize the radio communication between access point.WLAN mesh network has the features such as MANET, selfreparing, self-balancing, automatic expansion.Set up between STA on train and the AP of trackside and have point-to-point WLAN mesh network.But in the process of this network service, use dynamic routing, and dynamic routing also exists a network convergence time.Network convergence time refers to because the change of node upgrades routing table in network, and again grouped data is forwarded to the time needed for new interface.Existence due to network convergence time can cause the brief interruption of communication, if so what transmit in networking is the real time video image in compartment, then can cause the pause of image.
In Rail Transit System, when train travels in orbit, vehicle-mounted STA on train needs constantly to switch with trackside AP, each switching all can produce the renewal of a route, the renewal of each route all can produce a routing convergence, and this just causes train to communicate in running being often interrupted.
Summary of the invention
Technical problem to be solved by this invention is: the quick route renewing method providing a kind of track traffic communication system based on WLAN, this method eliminatess the convergence time of dynamic routing, avoid the interruption of network service.
For solving the problems of the technologies described above, the present invention adopts following technical scheme.
Based on a quick route renewing method for the track traffic communication system of WLAN, comprise the following steps:
Step one, train is in the process of advancing, and after vehicle-mounted STA is switched to another trackside AP from a trackside AP, the new trackside AP connected obtains the MAC Address of vehicle-mounted STA at once, then the information of the MAC Address comprising vehicle-mounted STA is sent to trackside server;
Step 2, after trackside server receives the information of the MAC Address comprising vehicle-mounted STA, the content of resolving information, if the MAC Address of vehicle-mounted STA meets the MAC Address specification of internet, trackside server then replys correct response message, and upgrades the server routing table of self at once; Otherwise return the response message of mistake.
As a preferred embodiment of the present invention, the SOCKET that described trackside AP sets up TCP with trackside server is connected, and trackside AP is connected and trackside server communication by SOCKET.
As another kind of preferred version of the present invention, described quick route renewing method also comprises step 3, if trackside AP receives the response message of the mistake that trackside server sends, then resends the information of the MAC Address comprising vehicle-mounted STA to trackside server; If trackside AP receives the correct response message that trackside server sends, then upgrade the AP routing table of self; The MAC Address that described AP routing table comprises the STA be connected with AP and the IP address of onboard servers be connected with STA.
As another preferred version of the present invention, described server routing table is stored in trackside server, and described server routing table comprises the IP address of object onboard servers.
Beneficial effect of the present invention is: the quick route renewing method of the track traffic communication system based on WLAN of the present invention have employed static routing, avoids the network brief interruption because of the generation of dynamic routing convergence time when STA and trackside AP switches.
Description of the invention and application are illustrative, not want by scope restriction of the present invention in the above-described embodiments.Distortion and the change of embodiment disclosed are here possible, are known for the replacement of embodiment those those of ordinary skill in the art and the various parts of equivalence.Those skilled in the art are noted that when not departing from spirit of the present invention or substantive characteristics, and the present invention with other forms, structure, layout, ratio, and can realize with other elements, material and parts.
Accompanying drawing explanation
Fig. 1 is the structural representation of the existing track traffic communication system based on WLAN;
Fig. 2 is the schematic flow sheet of the quick route renewing method of the track traffic communication system based on WLAN of the present invention.
Embodiment
At present, use in the track traffic communication system of WLAN technology, owing to using networking mode and the dynamic routing update method of mesh network, at STA (station, stand) and AP (Access Point, access point) switches time there is routing convergence time.Within this time period, network service interrupts.The present invention proposes the update method of static routing for this problem, eliminate the convergence time of dynamic routing, avoid the interruption of network service.
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Embodiment one
In track traffic, WLAN wireless aps is set at spacing intervals along trackside.Train driving in orbit time, vehicle-mounted STA node and immediate trackside AP connect, and realize the communication between trackside and train.The present embodiment provides a kind of quick route renewing method of the track traffic communication system based on WLAN, as shown in Figure 2, this method proposes and utilizes the method initiatively setting up static routing to realize the continuous transmission of data, mainly comprise following content:
1) SOCKET that trackside AP and trackside server set up TCP is connected.Trackside server is as the service end of SOCKET, and trackside AP is as the client of SOCKET.This exists after being connected to system cloud gray model always.
2) train is in the process of advancing, and vehicle-mounted STA ceaselessly can be switched to another trackside AP from a trackside AP.The vehicle-mounted STA list that trackside AP real time inspection is connected with self.Connect when there being vehicle-mounted STA after coming up, trackside AP reads the MAC Address of this vehicle-mounted STA at once, and by the protocol format good with trackside server commitment, the information comprising the MAC Address of vehicle-mounted STA obtained is sent to trackside server.
3) after trackside server receives information, the content of resolving information, if the MAC Address of the vehicle-mounted STA that trackside AP reports meets the MAC Address specification of internet, trackside server then replys correct response message, and upgrading the server routing table of self at once, the server routing table stored in this trackside server mainly comprises the IP address of the object onboard servers that data mail to; Otherwise return the response message of mistake.
4) if trackside AP receives the response message of mistake, then the information of the MAC Address comprising vehicle-mounted STA is resend.If due to communication failure or other reasons in process of transmitting, trackside AP does not receive the response message of trackside server, and trackside AP then resends the information of the MAC Address comprising vehicle-mounted STA.Namely trackside AP transmission comprises the information of the MAC Address of vehicle-mounted STA to after trackside server, and the transmission and reception at once of trackside server are successfully replied to trackside AP.If trackside AP does not receive in setting-up time receive successful response message, then resend the information of the MAC Address comprising vehicle-mounted STA.
5) after trackside server receives the information of the MAC Address comprising vehicle-mounted STA (after namely trackside server has replied correct response message), the IP address of the onboard servers be connected with vehicle-mounted STA is found out from the routing table be stored in advance in trackside server, and tell trackside AP by the IP address of this onboard servers, so just achieve the renewal of the AP routing table on trackside AP, the MAC Address that described AP routing table mainly comprises the STA be connected with AP and the IP address of onboard servers be connected with STA.When follow-up trackside AP sends data to vehicle-mounted STA, use the MAC Address after upgrading and IP address.
Method due to renewal route of the present invention upgrades the time used than dynamic routing and substantially reduces, thus improves the continuity of transfer of data.Present invention employs static routing, avoid the network brief interruption because of the generation of dynamic routing convergence time when STA and trackside AP switches.
Claims (3)
1., based on a quick route renewing method for the track traffic communication system of WLAN, it is characterized in that, comprise the following steps:
Step one, train is in the process of advancing, the vehicle-mounted STA list that trackside AP real time inspection is connected with self, after vehicle-mounted STA is switched to another trackside AP from a trackside AP, trackside AP in new connection obtains the MAC Address of vehicle-mounted STA at once, then the information of the MAC Address comprising vehicle-mounted STA is sent to trackside server;
Step 2, after trackside server receives the information of the MAC Address comprising vehicle-mounted STA, the content of resolving information, if the MAC Address of vehicle-mounted STA meets the MAC Address specification of internet, trackside server then replys correct response message, and upgrades the server routing table of self at once; The IP address of the object onboard servers that the data that mainly comprise described server routing table mail to; Otherwise return the response message of mistake; After described trackside server receives the information of the MAC Address comprising vehicle-mounted STA, the IP address of the onboard servers be connected with vehicle-mounted STA is found out from the routing table be stored in advance in trackside server, and tell trackside AP by the IP address of this onboard servers, realize the renewal of the AP routing table on trackside AP; The MAC Address that described AP routing table comprises the STA be connected with AP and the IP address of onboard servers be connected with STA; When follow-up trackside AP sends data to vehicle-mounted STA, to use the MAC Address after upgrading and IP address.
2. the quick route renewing method of the track traffic communication system based on WLAN according to claim 1, is characterized in that: the SOCKET that described trackside AP sets up TCP with trackside server is connected, and trackside AP is connected and trackside server communication by SOCKET.
3. the quick route renewing method of the track traffic communication system based on WLAN according to claim 1, it is characterized in that: described quick route renewing method also comprises step 3, if trackside AP receives the response message of the mistake that trackside server sends, then resend the information of the MAC Address comprising vehicle-mounted STA to trackside server; If trackside AP receives the correct response message that trackside server sends, then upgrade the AP routing table of self.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110190026.3A CN102869065B (en) | 2011-07-07 | 2011-07-07 | Rapid route updating method for rail traffic communication system based on WLAN (wireless local area network) |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110190026.3A CN102869065B (en) | 2011-07-07 | 2011-07-07 | Rapid route updating method for rail traffic communication system based on WLAN (wireless local area network) |
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| CN102869065A CN102869065A (en) | 2013-01-09 |
| CN102869065B true CN102869065B (en) | 2015-04-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505515A (en) * | 2009-01-08 | 2009-08-12 | 北京邮电大学 | Mobile station and handover method therefor when moving between central access points |
| CN101621802A (en) * | 2009-08-13 | 2010-01-06 | 杭州华三通信技术有限公司 | Method, system and device for authenticating portal in wireless network |
| CN101924704A (en) * | 2010-09-07 | 2010-12-22 | 杭州华三通信技术有限公司 | Method and device thereof for switching double-layer multicast links |
| CN102118813A (en) * | 2011-01-21 | 2011-07-06 | 西安理工大学 | Train communication system and method based on AP (Assess Point) switching |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060242457A1 (en) * | 2005-04-08 | 2006-10-26 | Interdigital Technology Corporation | Method and apparatus for coordinating seamless channel switching in a mesh network |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505515A (en) * | 2009-01-08 | 2009-08-12 | 北京邮电大学 | Mobile station and handover method therefor when moving between central access points |
| CN101621802A (en) * | 2009-08-13 | 2010-01-06 | 杭州华三通信技术有限公司 | Method, system and device for authenticating portal in wireless network |
| CN101924704A (en) * | 2010-09-07 | 2010-12-22 | 杭州华三通信技术有限公司 | Method and device thereof for switching double-layer multicast links |
| CN102118813A (en) * | 2011-01-21 | 2011-07-06 | 西安理工大学 | Train communication system and method based on AP (Assess Point) switching |
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