WO2011086094A1 - A method for diagnosis of fault in vehicular wireless communication systems - Google Patents

A method for diagnosis of fault in vehicular wireless communication systems Download PDF

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Publication number
WO2011086094A1
WO2011086094A1 PCT/EP2011/050339 EP2011050339W WO2011086094A1 WO 2011086094 A1 WO2011086094 A1 WO 2011086094A1 EP 2011050339 W EP2011050339 W EP 2011050339W WO 2011086094 A1 WO2011086094 A1 WO 2011086094A1
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WIPO (PCT)
Prior art keywords
rssis
fault
clients
received
access points
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PCT/EP2011/050339
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French (fr)
Inventor
Matthias Kuhn
Mattias Lampe
Hans-Joachim Vornholz
Jie Zhang
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Siemens Aktiengesellschaft
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Publication of WO2011086094A1 publication Critical patent/WO2011086094A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/06—Management of faults, events, alarms or notifications
    • H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • the present invention relates to a diagnosis of fault technique in vehicular wireless communication systems, and especially relates to a diagnosis of fault method in vehicular wireless communication systems and its device.
  • some mobile clients may move along a predictable path within the covered area of some Access Points (AP) .
  • these systems may be car-to- roadside communication systems, communication systems between the fixed part and the mobile part in the industrial transmission system, communication based train control (CBTC) systems, passenger information systems (PIS) and the like.
  • CBTC communication based train control
  • PIS passenger information systems
  • CBTC communication based train control
  • PIS passenger information systems
  • the radio frequency subsystem (including the wireless transreceiver, the radio-frequency cable and the aerial) is a universal cause which may influence the performances of the communication system when environmental conditions become relatively worse, especially when there is no proper monitoring applied on the integrity of said radio frequency subsystem, so that damages due to aging, mechanical pressure or environmental factors (such as wetness) may not be fixed in time, the radio frequency system may have a relatively larger effect to the performance of the communication system.
  • the diagnosis of the performance of the radio frequency system is not complete, and measurements with high sensitivity of the gradually generated or occurred component damages are hard to carry out, this makes it impossible to distinguish the sources of errors in more detail and more accurately with the existing measuring methods, for example, it is hard to distinguish whether the system damages come from the receiving terminal or the transmitting terminal of the wireless module; or it is impossible to distinguish whether the system damages come from the wireless module or the radio frequency cable .
  • Siemens AG has developed a simple radio frequency diagnosis mechanism which is applied in devices of the Access Point and the client.
  • two wireless modules are respectively set up at each Access Point and client, and the two wireless modules connect together to form a RSSI measurement loop.
  • one wireless module is set as the Access Point mode, while the other wireless module is set as the client mode. That is to say, during the test procedure, one wireless module will transmit the RSSI signals, while the other wireless module will receive the RSSI signals, and determine whether any fault or damage has occurred in one module based on the received RSSIs.
  • the above- mentioned process may be performed again in the opposite direction (that is, the wireless module which transmits the RSSI signals is employed as the receiver, and the wireless module which receives the RSSI signals is employed as the transmitter) .
  • a fault may be considered to be occurring at the Access Point or the client.
  • Module A receives a good RSSI
  • Module B receives a RSSI lower than the threshold
  • the damage may occur at the transmitting terminal of Module A or the receiving terminal of Module B, however, it is hard to determine whether the problem occurs on the transmitting terminal of Module A or the receiving terminal of Module B.
  • the threshold in this test system relies on the accurate installation scheme of the aerial system, however, in the same WLAN system, different Access Points may have different lengths of aerial and cable, therefore, different thresholds should be defined for different Access Points,
  • the main purpose of the present invention lies in providing a method for diagnosis of fault in vehicular wireless communication systems and devices for implementing the method, by which the diagnosis of fault in vehicular wireless communication systems can be made more accurately.
  • the present invention has proposed a method for diagnosis of fault in vehicular wireless communication systems, wherein, said vehicular wireless communication system comprises a backbone network, more than one Access Point connected to said backbone network and more than one client, and the method further comprising steps of:
  • Each of said Access Points operates as follows: said Access Points receive the received signal strength indications (RSSI) transmitted by each of the clients connected with them; besides, each of said clients operate as follows: said clients receive the RSSIs transmitted by each of the Access Points connected with them;
  • RSSI received signal strength indications
  • Said Access Points and clients respectively store the received RSSIs and collect the statistics of the stored RSSI values; or, said Access Points and clients respectively transmit the received RSSIs to a fault diagnosis server and said fault diagnosis server stores the received RSSIs and collects the statistics of the stored RSSIs;
  • RSSIs received by said Access Points from each of the clients connected with them and RSSIs received by said clients from each of the Access Points connected with them have a time stamp.
  • said fault diagnosis server is connected to said backbone network, each of said Access Points transmit the received RSSIs from said backbone network to said fault diagnosis server, and each of said clients transmit the received RSSIs from the Access Points connected with them to said fault diagnosis server.
  • step (2) when said Access Points or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the clients from the packets transmitted by each of the clients connected with them, divide the RSSIs transmitted by said clients into more than one time interval and find the maximum/average/median value of the RSSIs observed during each of said intervals; when said clients or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the Access Points from the values of the packets transmitted by each of the Access Points connected with them, divide the RSSIs transmitted by said Access Points into more than one time interval and find the maximum/average/median value of the RSSIs observed during each of said intervals.
  • said Access Points or said fault diagnosis server collect the statistics of received RSSIs during a fixed time interval, they respectively pick up the RSSIs of the clients from the packets transmitted by each of the clients connected with them, divide the RSSIs transmitted by said clients into more than one time interval, and find the maximum/average/median value of the RSSIs observed during each of said intervals; when said clients or said fault diagnosis server collect the statistics of received RSSI during said fixed time interval, they respectively pick up the RSSIs of the Access Points from the values of the packets transmitted by each of the Access Points connected with them, divide the RSSIs transmitted by said Access Points into more than one time interval and find the maximum/average/median value of the RSSIs observed during each of said intervals.
  • said Access Points or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the clients from the values of the packets transmitted by each of the clients connected with them, and make a histogram of the RSSIs transmitted by said clients; when said clients or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the Access Points from the values of the packets transmitted by each of the Access Points connected with them, and make a histogram of the RSSIs transmitted by said Access Points.
  • step (3) if the RSSIs transmitted by a particular Access Point and then received by at least part of the client show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said Access Point.
  • the RSSI of the client received by said Access Point is a normal value, then it is determined that the fault is located in the transmitter of the wireless module of said Access Point; otherwise, if the RSSI of the client received by said Access Point shows a downtrend, then it is determined that the fault is located in the cable or aerial of said Access Point.
  • step (3) if the RSSIs received by one client from all Access Points show a downtrend in said time interval, while the RSSIs received by other clients from all Access Points are normal values, then it is determined that the fault is located in the radio frequency system of said client.
  • the RSSIs of said client received by all Access Points show a downtrend, then it is determined that the fault is located in the cable or aerial of said client; otherwise, if the RSSIs of said client received by all Access Points are normal values, then it is determined that the fault is located in the receiver of the wireless module of said client.
  • step (3) if the RSSIs transmitted by a particular client and then received by at least part of the Access Point show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said client. Wherein, if the RSSIs of the Access Point received by said client show a downtrend, then it is determined that the fault is located in the cable or aerial of said client; otherwise, if the RSSIs of the Access Point received by said client are normal values, then it is determined that the fault is located in the receiver of the wireless module of said client.
  • step (3) if the RSSIs transmitted by all clients and then received by an Access Point show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said Access Point. Wherein, if the RSSIs of said Access Point received by all clients show a downtrend, then it is determined that the fault is located in the cable or aerial of said Access Point; otherwise, if the RSSIs of said Access Point received by all clients are normal values, then it is determined that the fault is located in the receiver of the wireless module of said Access Point.
  • said vehicular wireless communication systems are wireless LAN systems.
  • the present invention also proposes a system for diagnosis of fault in vehicular wireless communication systems
  • said vehicular wireless communication system comprises a backbone network, more than one Access Point connected to said backbone network and more than one client
  • said system also comprises a fault diagnosis server
  • each of said Access Points receives the RSSIs transmitted by each of the clients connected with them
  • each of said clients receives the RSSIs transmitted by each of the Access Points connected with them, beside, said Access Points and said clients respectively transmit the received RSSIs to said fault diagnosis server.
  • said fault diagnosis server comprises a statistical module and a diagnosis module, said statistical module is used for storing the received RSSIs and then collecting the statistics of the stored RSSIs; said diagnosis module is used for determining the fault in said vehicular wireless communication systems based on said statistical values.
  • the present invention also proposes a device for diagnosis of fault in vehicular wireless communication systems
  • said device for diagnosis of fault in vehicular wireless communication systems comprises more than one first subdevices and more than one second subdevices, said first subdevices receive the RSSIs transmitted by each of the second subdevices connected with them, while said second subdevices receive the RSSIs transmitted by each of the first subdevices connected with them, said first subdevices and said second subdevices respectively collect the statistics of the RSSIs received by them and determine the fault in said vehicular wireless communication systems based on said statistical values.
  • said first subdevice and second subdevice are respectively the Access Point and the client of the wireless LAN.
  • the present invention has provided a method for diagnosis of fault in vehicular wireless communication systems.
  • the use of the present method of invention does not need to stop the transmission of normal packets, therefore, it can be performed in the normal operation of the network system.
  • the use of the present method of invention does not need to respectively install at least two wireless modules at both of the Access Point and the client, therefore, a lot of resources may be saved.
  • the use of the present method of invention can make a more accurate determination on the element with fault, especially distinguish whether the damage occurs on the wireless module (even the transmitting terminal or receiving terminal) or the aerial/cable, therefore, it can simplify the maintenance and restoration of the system.
  • the method performs the fault diagnosis with statistics obtained within a relatively longer communication interval, and can obtain a more accurate and reliable result of measurement compared with the measurement loop in prior art.
  • the present invention performs the fault diagnosis with the trend of the statistics, that is, the difference method, and compared with a practical threshold in prior art, the present invention is more suitable for the installation methods of different types of aerial or different hardwire types in the system.
  • Figure 1 shows the composition of a vehicular wireless communication system which adopts the present invention
  • Figure 2 shows the flow chart of method for diagnosis of fault in vehicular wireless communication systems of the present invention
  • Figure 3 shows the schematic diagram of using the time interval to collect the statistics in the method for diagnosis of fault in the vehicular wireless communication systems of the present invention .
  • FIG. 1 shows the composition of a vehicular wireless communication system which adopts the present invention, and the wireless communication system mainly uses the WLAN network.
  • the WLAN network comprises a backbone network, several Access Points (AP) and several clients. Each AP is connected onto the backbone network while being connected with more than one client, each client is connected with more than one Access Point AP .
  • the client vehicle
  • the client will move within the covered area of some Access Points AP along a relatively predictable path, under this circumstance, although the RSSI values received by each Access Point from the client and/or the RSSI values received by each client from AP may vary with the movement of the client, the maximum values of said RSSI are generally comparable and even the same.
  • FIG. 2 shows the flow chart of method for diagnosis of fault in vehicular wireless communication systems of the present invention.
  • each AP receives the RSSIs transmitted by each of the clients connected with it; besides, each client receives the RSSIs transmitted by each of the APs connected with it.
  • said APs and said clients respectively store the received RSSIs and then collect the statistics of the stored RSSIs.
  • the Access Points and the clients should be modified a little so that the statistical function of RSSIs may be added.
  • the Access Point and the client can respectively transmit the received RSSIs to a fault diagnosis server, and the fault diagnosis server is connected to the backbone network to store the RSSIs and then collect the statistics of the stored RSSIs.
  • each Access Point transmits the received RSSIs to the fault diagnosis server through the backbone network, and each client transmits the received RSSIs to said fault diagnosis server through the Access Points connected with it.
  • the collection of statistics can be performed in accordance with any of the following methods. The following part will take each AP and each client for example to explain the statistical method .
  • FIG. 3 shows the schematic diagram of using the time interval to collect the statistics in the method for diagnosis of fault in the vehicular wireless communication systems of the present invention, in which the RSSIs received by the Access Point API from the client CI are denoted as AP1-C1, that is to say, the Access Point API picks up a RSSI from each packet transmitted by the client CI, and each RSSI has a time stamp, which indicates the time when the RSSI is received.
  • the RSSIs transmitted by these clients After that, it divides the RSSIs transmitted by these clients into N time intervals, and finds the maximum value of the RSSIs in each time interval. For example, if the communication time between the client CI and the Access Point API is 100 ms, and altogether 20 RSSIs have been received during that time, then the 20 RSSIs may be divided into 5 time intervals, so that each time interval may have 4 RSSIs, and then the maximum value of the RSSIs in each of the 5 time intervals may be individually found .
  • the clients collect the statistics of the received RSSIs, they respectively pick up the RSSIs of the Access Point from the packets transmitted by each Access Point connected with them, divide the RSSIs transmitted by said Access Point into more than one time interval, and find the maximum value of the RSSIs in each of said time intervals.
  • the average value or the median value of the RSSIs in each time interval may also be found.
  • the second method is similar to the first one, and the difference lies in that, the measurement of RSSI in the first method is carried out in an integral communication process (i.e., collecting the statistics of the RSSI in each packet between the association field and the diassociation field) , and herein, the collection of statistics of RSSIs in each packet in the second method is carried out in a fixed time interval.
  • the communication times collected from each client/AP in the first method may not be the same, while the second method is performed in the same time interval, for example, start from Time A to Time B.
  • each Access Point respectively picks up the RSSIs of the client from the packet transmitted by each client connected to it in said time interval, and then divides the RSSIs transmitted by these clients into N time intervals, and finds the maximum value of RSSIs in each time interval.
  • each client respectively picks up the RSSIs of the Access Point from the packet transmitted by each Access Point connected to it in said time interval, and then divides the RSSIs transmitted by these Access Points into N time intervals, and finds the maximum value of RSSIs in each time interval.
  • the average value or the median value of the RSSIs in each time interval may also be found.
  • the third method which is different from the previous two methods, in which clients/Access Points receive the RSSIs from the Access Points/clients connected with them, and find the maximum, average or median value in each of the divided time intervals, will make said RSSIs to form a histogram.
  • the process may be carried out in a complete communication process (similar to the first method) , and may also be carried out in a fixed time interval (similar to the second method) .
  • the fault in the wireless communication systems is determined based on the statistics.
  • Case three if the RSSIs transmitted by a client which are then received by at least part of the Access Point show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said client. Wherein, if the RSSIs of the Access Point received by said client show a downtrend, then it is determined that the fault is located in the cable or aerial of said client; otherwise, if the RSSIs of the Access Point received by said client are normal values, then it is determined that the fault is located in the receiver of the wireless module of said client.
  • the present invention also proposes a system for diagnosis of fault in vehicular wireless communication systems, said vehicular wireless communication system comprises a backbone network, more than one Access Point connected to said backbone network and more than one client, said system also comprises a fault diagnosis server, each of said Access Points receives the RSSIs transmitted by each of the clients connected with them, each of said clients receives the RSSIs transmitted by each of the Access Points connected with them, besides, said Access Points and said clients respectively transmit the received RSSIs to said fault diagnosis server.
  • Said fault diagnosis server comprises a statistical module and a diagnosis module, said statistical module is used for storing the received RSSIs and then collecting the statistics of the stored RSSIs; said diagnosis module is used for determining the fault in said vehicular wireless communication systems based on said statistical values.
  • the present invention also proposes a device for diagnosis of fault in vehicular wireless communication systems, said device for diagnosis of fault in vehicular wireless communication systems comprises more than one Access Point in the WLAN and more than one client in the WLAN, said Access Points receive the RSSIs from each client connected with them, said clients receive the RSSIs from each Access Point connected with them, said Access Points and clients respectively collect the statistics of the RSSIs and determine the fault in said vehicular wireless communication systems in accordance with said statistical values.

Abstract

The present invention proposes a method for diagnosis of fault in vehicular wireless communication systems, the system comprises a backbone network, more than one Access Point connected to said backbone network and more than one client, and the method comprises: (1) each of said Access Points receives the received signal strength indications (RSSIs) transmitted by each of the clients connected with them, and each of said clients receive the RSSIs transmitted by each of the Access Points connected with them; (2) said Access Points and clients respectively store the received RSSIs and collect the statistics of the stored RSSIs; or, said Access Points and clients respectively transmit the received RSSIs to fault diagnosis server and said fault diagnosis server stores the received RSSIs and collects the statistics of the stored RSSIs; (3) determine the fault in said communication systems based on said statistics. By using the method of the present invention, the element at which the fault has occurred can be determined more accurately, and the process can be performed in the normal operation of the system.

Description

Specification
A Method for Diagnosis of Fault in Vehicular Wireless
Communication Systems
Technical field
The present invention relates to a diagnosis of fault technique in vehicular wireless communication systems, and especially relates to a diagnosis of fault method in vehicular wireless communication systems and its device.
Background art
In the wireless communication system, some mobile clients may move along a predictable path within the covered area of some Access Points (AP) . For example, these systems may be car-to- roadside communication systems, communication systems between the fixed part and the mobile part in the industrial transmission system, communication based train control (CBTC) systems, passenger information systems (PIS) and the like. In above-mentioned communication systems, especially their applications related to safety (such as CBTC) , it can be very important to find and fix the damaged component, and it is especially important to fix these damaged components before the damage has caused any negative effects to the system.
It has been proved that the radio frequency subsystem (including the wireless transreceiver, the radio-frequency cable and the aerial) is a universal cause which may influence the performances of the communication system when environmental conditions become relatively worse, especially when there is no proper monitoring applied on the integrity of said radio frequency subsystem, so that damages due to aging, mechanical pressure or environmental factors (such as wetness) may not be fixed in time, the radio frequency system may have a relatively larger effect to the performance of the communication system.
At present, the diagnosis of the performance of the radio frequency system is not complete, and measurements with high sensitivity of the gradually generated or occurred component damages are hard to carry out, this makes it impossible to distinguish the sources of errors in more detail and more accurately with the existing measuring methods, for example, it is hard to distinguish whether the system damages come from the receiving terminal or the transmitting terminal of the wireless module; or it is impossible to distinguish whether the system damages come from the wireless module or the radio frequency cable .
Siemens AG has developed a simple radio frequency diagnosis mechanism which is applied in devices of the Access Point and the client. In the scheme, two wireless modules are respectively set up at each Access Point and client, and the two wireless modules connect together to form a RSSI measurement loop. During the test procedure, one wireless module is set as the Access Point mode, while the other wireless module is set as the client mode. That is to say, during the test procedure, one wireless module will transmit the RSSI signals, while the other wireless module will receive the RSSI signals, and determine whether any fault or damage has occurred in one module based on the received RSSIs. The above- mentioned process may be performed again in the opposite direction (that is, the wireless module which transmits the RSSI signals is employed as the receiver, and the wireless module which receives the RSSI signals is employed as the transmitter) . If the RSSIs received in one or two directions of the Access Point or the client are lower than a certain threshold, a fault may be considered to be occurring at the Access Point or the client. Although the above-mentioned method can identify the faults at the Access Point or the client, it still suffered from the following defects:
First, this kind of test can not be carried out in the normal operation of the system, therefore, it is impossible to determine the time when the first damage occurs.
Second, suppose that the wireless modules in the communication system can be classified as Module A and Module B. If Module A receives a good RSSI, while Module B receives a RSSI lower than the threshold, then the damage may occur at the transmitting terminal of Module A or the receiving terminal of Module B, however, it is hard to determine whether the problem occurs on the transmitting terminal of Module A or the receiving terminal of Module B.
Third, the threshold in this test system relies on the accurate installation scheme of the aerial system, however, in the same WLAN system, different Access Points may have different lengths of aerial and cable, therefore, different thresholds should be defined for different Access Points,
Fourth, in order to carry out such a test, at least two wireless modules should be installed at the Access Point and client respectively, and this redundant module is a waste of resource .
Contents of the invention
The main purpose of the present invention lies in providing a method for diagnosis of fault in vehicular wireless communication systems and devices for implementing the method, by which the diagnosis of fault in vehicular wireless communication systems can be made more accurately. In order to achieve above-mentioned purposes, the present invention has proposed a method for diagnosis of fault in vehicular wireless communication systems, wherein, said vehicular wireless communication system comprises a backbone network, more than one Access Point connected to said backbone network and more than one client, and the method further comprising steps of:
(1) Each of said Access Points operates as follows: said Access Points receive the received signal strength indications (RSSI) transmitted by each of the clients connected with them; besides, each of said clients operate as follows: said clients receive the RSSIs transmitted by each of the Access Points connected with them;
(2) Said Access Points and clients respectively store the received RSSIs and collect the statistics of the stored RSSI values; or, said Access Points and clients respectively transmit the received RSSIs to a fault diagnosis server and said fault diagnosis server stores the received RSSIs and collects the statistics of the stored RSSIs;
(3) determine the fault in said wireless communication systems based on said statistics.
Preferably, in said step (1), RSSIs received by said Access Points from each of the clients connected with them and RSSIs received by said clients from each of the Access Points connected with them have a time stamp.
Preferably, in said step (2), said fault diagnosis server is connected to said backbone network, each of said Access Points transmit the received RSSIs from said backbone network to said fault diagnosis server, and each of said clients transmit the received RSSIs from the Access Points connected with them to said fault diagnosis server. Preferably, in said step (2), when said Access Points or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the clients from the packets transmitted by each of the clients connected with them, divide the RSSIs transmitted by said clients into more than one time interval and find the maximum/average/median value of the RSSIs observed during each of said intervals; when said clients or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the Access Points from the values of the packets transmitted by each of the Access Points connected with them, divide the RSSIs transmitted by said Access Points into more than one time interval and find the maximum/average/median value of the RSSIs observed during each of said intervals.
Preferably, in said step (2), when said Access Points or said fault diagnosis server collect the statistics of received RSSIs during a fixed time interval, they respectively pick up the RSSIs of the clients from the packets transmitted by each of the clients connected with them, divide the RSSIs transmitted by said clients into more than one time interval, and find the maximum/average/median value of the RSSIs observed during each of said intervals; when said clients or said fault diagnosis server collect the statistics of received RSSI during said fixed time interval, they respectively pick up the RSSIs of the Access Points from the values of the packets transmitted by each of the Access Points connected with them, divide the RSSIs transmitted by said Access Points into more than one time interval and find the maximum/average/median value of the RSSIs observed during each of said intervals.
Preferably, in said step (2), when said Access Points or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the clients from the values of the packets transmitted by each of the clients connected with them, and make a histogram of the RSSIs transmitted by said clients; when said clients or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the Access Points from the values of the packets transmitted by each of the Access Points connected with them, and make a histogram of the RSSIs transmitted by said Access Points.
Preferably, in said step (3) , if the RSSIs transmitted by a particular Access Point and then received by at least part of the client show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said Access Point. Wherein, if the RSSI of the client received by said Access Point is a normal value, then it is determined that the fault is located in the transmitter of the wireless module of said Access Point; otherwise, if the RSSI of the client received by said Access Point shows a downtrend, then it is determined that the fault is located in the cable or aerial of said Access Point.
Preferably, in said step (3) , if the RSSIs received by one client from all Access Points show a downtrend in said time interval, while the RSSIs received by other clients from all Access Points are normal values, then it is determined that the fault is located in the radio frequency system of said client. Wherein, if the RSSIs of said client received by all Access Points show a downtrend, then it is determined that the fault is located in the cable or aerial of said client; otherwise, if the RSSIs of said client received by all Access Points are normal values, then it is determined that the fault is located in the receiver of the wireless module of said client.
Preferably, in said step (3) , if the RSSIs transmitted by a particular client and then received by at least part of the Access Point show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said client. Wherein, if the RSSIs of the Access Point received by said client show a downtrend, then it is determined that the fault is located in the cable or aerial of said client; otherwise, if the RSSIs of the Access Point received by said client are normal values, then it is determined that the fault is located in the receiver of the wireless module of said client.
Preferably, in said step (3) , if the RSSIs transmitted by all clients and then received by an Access Point show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said Access Point. Wherein, if the RSSIs of said Access Point received by all clients show a downtrend, then it is determined that the fault is located in the cable or aerial of said Access Point; otherwise, if the RSSIs of said Access Point received by all clients are normal values, then it is determined that the fault is located in the receiver of the wireless module of said Access Point.
Preferably, said vehicular wireless communication systems are wireless LAN systems.
Accordingly, the present invention also proposes a system for diagnosis of fault in vehicular wireless communication systems, said vehicular wireless communication system comprises a backbone network, more than one Access Point connected to said backbone network and more than one client, said system also comprises a fault diagnosis server, each of said Access Points receives the RSSIs transmitted by each of the clients connected with them, each of said clients receives the RSSIs transmitted by each of the Access Points connected with them, beside, said Access Points and said clients respectively transmit the received RSSIs to said fault diagnosis server. Preferably, said fault diagnosis server comprises a statistical module and a diagnosis module, said statistical module is used for storing the received RSSIs and then collecting the statistics of the stored RSSIs; said diagnosis module is used for determining the fault in said vehicular wireless communication systems based on said statistical values.
Accordingly, the present invention also proposes a device for diagnosis of fault in vehicular wireless communication systems, said device for diagnosis of fault in vehicular wireless communication systems comprises more than one first subdevices and more than one second subdevices, said first subdevices receive the RSSIs transmitted by each of the second subdevices connected with them, while said second subdevices receive the RSSIs transmitted by each of the first subdevices connected with them, said first subdevices and said second subdevices respectively collect the statistics of the RSSIs received by them and determine the fault in said vehicular wireless communication systems based on said statistical values.
Preferably, said first subdevice and second subdevice are respectively the Access Point and the client of the wireless LAN.
The present invention has provided a method for diagnosis of fault in vehicular wireless communication systems. With this method, firstly, the use of the present method of invention does not need to stop the transmission of normal packets, therefore, it can be performed in the normal operation of the network system. Secondly, the use of the present method of invention does not need to respectively install at least two wireless modules at both of the Access Point and the client, therefore, a lot of resources may be saved. In addition, the use of the present method of invention can make a more accurate determination on the element with fault, especially distinguish whether the damage occurs on the wireless module (even the transmitting terminal or receiving terminal) or the aerial/cable, therefore, it can simplify the maintenance and restoration of the system. Moreover, the method performs the fault diagnosis with statistics obtained within a relatively longer communication interval, and can obtain a more accurate and reliable result of measurement compared with the measurement loop in prior art. Finally, the present invention performs the fault diagnosis with the trend of the statistics, that is, the difference method, and compared with a practical threshold in prior art, the present invention is more suitable for the installation methods of different types of aerial or different hardwire types in the system.
Brief Description of the Drawings
The following part will make a further detailed description of the embodiments of the present invention in combination with the figures, wherein,
Figure 1 shows the composition of a vehicular wireless communication system which adopts the present invention;
Figure 2 shows the flow chart of method for diagnosis of fault in vehicular wireless communication systems of the present invention ;
Figure 3 shows the schematic diagram of using the time interval to collect the statistics in the method for diagnosis of fault in the vehicular wireless communication systems of the present invention .
Embodiments
Figure 1 shows the composition of a vehicular wireless communication system which adopts the present invention, and the wireless communication system mainly uses the WLAN network. To be specific, the WLAN network comprises a backbone network, several Access Points (AP) and several clients. Each AP is connected onto the backbone network while being connected with more than one client, each client is connected with more than one Access Point AP . In the vehicular wireless communication system as shown in Figure 1, generally, the client (vehicle) will move within the covered area of some Access Points AP along a relatively predictable path, under this circumstance, although the RSSI values received by each Access Point from the client and/or the RSSI values received by each client from AP may vary with the movement of the client, the maximum values of said RSSI are generally comparable and even the same.
Figure 2 shows the flow chart of method for diagnosis of fault in vehicular wireless communication systems of the present invention. To be specific, firstly, each AP receives the RSSIs transmitted by each of the clients connected with it; besides, each client receives the RSSIs transmitted by each of the APs connected with it.
Secondly, said APs and said clients respectively store the received RSSIs and then collect the statistics of the stored RSSIs. In order to achieve above-mentioned function, the Access Points and the clients should be modified a little so that the statistical function of RSSIs may be added. In another preferred method, the Access Point and the client can respectively transmit the received RSSIs to a fault diagnosis server, and the fault diagnosis server is connected to the backbone network to store the RSSIs and then collect the statistics of the stored RSSIs. To be specific, each Access Point transmits the received RSSIs to the fault diagnosis server through the backbone network, and each client transmits the received RSSIs to said fault diagnosis server through the Access Points connected with it. No matter what statistics of RSSIs are collected by each AP and each client, or collected by the fault diagnosis server, the collection of statistics can be performed in accordance with any of the following methods. The following part will take each AP and each client for example to explain the statistical method .
As the first method, when the access points collect the statistics of the received RSSIs, they will pick up the RSSIs of the clients from the packets transmitted by each client connected with them. The transmission of these packets is between the association field and the diassociation field transmitted by the clients. The RSSIs transmitted by these clients are divided into more than one time interval, Figure 3 shows the schematic diagram of using the time interval to collect the statistics in the method for diagnosis of fault in the vehicular wireless communication systems of the present invention, in which the RSSIs received by the Access Point API from the client CI are denoted as AP1-C1, that is to say, the Access Point API picks up a RSSI from each packet transmitted by the client CI, and each RSSI has a time stamp, which indicates the time when the RSSI is received. After that, it divides the RSSIs transmitted by these clients into N time intervals, and finds the maximum value of the RSSIs in each time interval. For example, if the communication time between the client CI and the Access Point API is 100 ms, and altogether 20 RSSIs have been received during that time, then the 20 RSSIs may be divided into 5 time intervals, so that each time interval may have 4 RSSIs, and then the maximum value of the RSSIs in each of the 5 time intervals may be individually found .
Similarly, when the clients collect the statistics of the received RSSIs, they respectively pick up the RSSIs of the Access Point from the packets transmitted by each Access Point connected with them, divide the RSSIs transmitted by said Access Point into more than one time interval, and find the maximum value of the RSSIs in each of said time intervals.
Besides, in addition to finding the maximum value of the RSSIs in each time interval, the average value or the median value of the RSSIs in each time interval may also be found.
The second method is similar to the first one, and the difference lies in that, the measurement of RSSI in the first method is carried out in an integral communication process (i.e., collecting the statistics of the RSSI in each packet between the association field and the diassociation field) , and herein, the collection of statistics of RSSIs in each packet in the second method is carried out in a fixed time interval. In other words, the communication times collected from each client/AP in the first method may not be the same, while the second method is performed in the same time interval, for example, start from Time A to Time B. The other processes are the same with the first method, that is, each Access Point respectively picks up the RSSIs of the client from the packet transmitted by each client connected to it in said time interval, and then divides the RSSIs transmitted by these clients into N time intervals, and finds the maximum value of RSSIs in each time interval.
Similarly, each client respectively picks up the RSSIs of the Access Point from the packet transmitted by each Access Point connected to it in said time interval, and then divides the RSSIs transmitted by these Access Points into N time intervals, and finds the maximum value of RSSIs in each time interval.
In addition to finding the maximum value of the RSSIs in each time interval, the average value or the median value of the RSSIs in each time interval may also be found. The third method, which is different from the previous two methods, in which clients/Access Points receive the RSSIs from the Access Points/clients connected with them, and find the maximum, average or median value in each of the divided time intervals, will make said RSSIs to form a histogram.
When unifying the RSSIs in accordance with this method, the process may be carried out in a complete communication process (similar to the first method) , and may also be carried out in a fixed time interval (similar to the second method) .
The above-mentioned part only lists three methods employed in the statistical collection of RSSIs, however, those skilled in the art would have known other statistics performed based on the RSSI. So far, the second step of the method of the present invention has been completed. After that step, several statistical values or statistical charts of RSSI may be accumulated on the Access Points and the clients, or the fault diagnosis server.
Finally, the fault in the wireless communication systems is determined based on the statistics. Herein, we only use some principles of determination to explain how to use above- mentioned statistical values to determine the fault in the vehicular wireless communication systems:
Case one, if the RSSIs transmitted by an Access Point which are then received by at least part of the client show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said Access Point. Wherein, if the RSSI of the client received by said Access Point is a normal value, then it is determined that the fault is located in the transmitter of the wireless module of said Access Point; otherwise, if the RSSI of the client received by said Access Point shows a downtrend, then it is determined that the fault is located in the cable or aerial of said Access Point .
Case two, if the RSSIs received by one client from all Access Points show a downtrend in said time interval, while the RSSIs received by other clients from all Access Points are normal values, then it is determined that the fault is located in the radio frequency system of said client. Wherein, if the RSSIs of said client received by all Access Points show a downtrend, then it is determined that the fault is located in the cable or aerial of said client; otherwise, if the RSSIs of said client received by all Access Points are normal values, then it is determined that the fault is located in the receiver of the wireless module of said client.
Case three, if the RSSIs transmitted by a client which are then received by at least part of the Access Point show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said client. Wherein, if the RSSIs of the Access Point received by said client show a downtrend, then it is determined that the fault is located in the cable or aerial of said client; otherwise, if the RSSIs of the Access Point received by said client are normal values, then it is determined that the fault is located in the receiver of the wireless module of said client.
Case four, if the RSSIs transmitted by all clients and then received by an Access Point show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said Access Point. Wherein, if the RSSIs of said Access Point received by all clients show a downtrend, then it is determined that the fault is located in the cable or aerial of said Access Point; otherwise, if the RSSIs of said Access Point received by all clients are normal values, then it is determined that the fault is located in the receiver of the wireless module of said Access Point. In addition to the above-mentioned determination principles, those skilled in the art can make a reasonable determination of the fault in the vehicular wireless communication system in accordance with several statistical values of RSSI obtained in the second step.
The present invention also proposes a system for diagnosis of fault in vehicular wireless communication systems, said vehicular wireless communication system comprises a backbone network, more than one Access Point connected to said backbone network and more than one client, said system also comprises a fault diagnosis server, each of said Access Points receives the RSSIs transmitted by each of the clients connected with them, each of said clients receives the RSSIs transmitted by each of the Access Points connected with them, besides, said Access Points and said clients respectively transmit the received RSSIs to said fault diagnosis server.
Said fault diagnosis server comprises a statistical module and a diagnosis module, said statistical module is used for storing the received RSSIs and then collecting the statistics of the stored RSSIs; said diagnosis module is used for determining the fault in said vehicular wireless communication systems based on said statistical values.
The present invention also proposes a device for diagnosis of fault in vehicular wireless communication systems, said device for diagnosis of fault in vehicular wireless communication systems comprises more than one Access Point in the WLAN and more than one client in the WLAN, said Access Points receive the RSSIs from each client connected with them, said clients receive the RSSIs from each Access Point connected with them, said Access Points and clients respectively collect the statistics of the RSSIs and determine the fault in said vehicular wireless communication systems in accordance with said statistical values.
What is said above are only the preferred embodiments of the present invention, and it should be noted that, for those with ordinary skills in the art, several improvements and modifications may be made on the premise of not deviating from the principles of the present invention, and these improvements and modifications should also be considered as in the protection range of the present invention.

Claims

Claims
1. A method for diagnosis of fault in vehicular wireless communication systems, wherein, said vehicular wireless communication system comprises a backbone network, more than one Access Point connected to said backbone network and more than one client, characterized in that, the method further comprising steps of:
(1) Each of said Access Points operates as follows: said Access Points receive the received signal strength indications (RSSI) transmitted by each of the clients connected with them; besides, each of said clients operate as follows: said clients receive the RSSIs transmitted by each of the Access Points connected with them;
(2) Said Access Points and clients respectively store the received RSSIs and collect the statistics of the stored RSSI values; or, said Access Points and clients respectively transmit the received RSSIs to a fault diagnosis server and said fault diagnosis server stores the received RSSIs and collects the statistics of the stored RSSIs;
(3) determine the fault in said wireless communication systems based on said statistics.
2. The method for diagnosis of fault in vehicular wireless communication systems according to claim 1, characterized in that, in said step (1), RSSIs received by said Access Points from each of the clients connected with them and RSSIs received by said clients from each of the Access Points connected with them have a time stamp.
3. The method for diagnosis of fault in vehicular wireless communication systems according to claim 1, characterized in that, in said step (2), said fault diagnosis server is connected to said backbone network, each of said Access Points transmit the received RSSIs from said backbone network to said fault diagnosis server, and each of said clients transmit the received RSSIs from the Access Points connected with them to said fault diagnosis server.
4. The method for diagnosis of fault in vehicular wireless communication systems according to claim 1, characterized in that, in said step (2), when said Access Points or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the clients from the packets transmitted by each of the clients connected with them, divide the RSSIs transmitted by said clients into more than one time interval and find the maximum/average/median value of the RSSIs observed during each of said intervals; when said clients or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the Access Points from the values of the packets transmitted by each of the Access Points connected with them, divide the RSSIs transmitted by said Access Points into more than one time interval and find the maximum/average/median value of the RSSIs observed during each of said intervals.
5. The method for diagnosis of fault in vehicular wireless communication systems according to claim 1, characterized in that, in said step (2), when said Access Points or said fault diagnosis server collect the statistics of received RSSIs during a fixed time interval, they respectively pick up the RSSIs of the clients from the packets transmitted by each of the clients connected with them, divide the RSSIs transmitted by said clients into more than one time interval, and find the maximum/average/median value of the RSSIs observed during each of said intervals; when said clients or said fault diagnosis server collect the statistics of received RSSI during said fixed time interval, they respectively pick up the RSSIs of the Access Points from the values of the packets transmitted by each of the Access Points connected with them, divide the RSSIs transmitted by said Access Points into more than one time interval and find the maximum/average/median value of the RSSIs observed during each of said intervals.
6. The method for diagnosis of fault in vehicular wireless communication systems according to claim 1, characterized in that, in said step (2), when said Access Points or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the clients from the values of the packets transmitted by each of the clients connected with them, and make a histogram of the RSSIs transmitted by said clients; when said clients or said fault diagnosis server collect the statistics of received RSSIs, they respectively pick up the RSSIs of the Access Points from the values of the packets transmitted by each of the Access Points connected with them, and make a histogram of the RSSIs transmitted by said Access Points.
7. The method for diagnosis of fault in vehicular wireless communication systems according to claim 4, 5 or 6, characterized in that, in said step (3) , if the RSSIs transmitted by a particular Access Point and then received by at least part of the client show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said Access Point.
8. The method for diagnosis of fault in vehicular wireless communication systems according to claim 7, characterized in that, if the RSSIs of clients received by said Access Point are normal values, then it is determined that the fault is located in the transmitter of the wireless module of said Access Point; otherwise, if the RSSIs of clients received by said Access Point show a downtrend, then it is determined that the fault is located in the cable or aerial of said Access Point.
9. The method for diagnosis of fault in vehicular wireless communication systems according to claim 4, 5 or 6, characterized in that, in said step (3) , if the RSSIs received by one client from all Access Points show a downtrend in said time interval, while the RSSIs received by other clients from all Access Points are normal values, then it is determined that the fault is located in the radio frequency system of said client .
10. The method for diagnosis of fault in vehicular wireless communication systems according to claim 9, characterized in that, if the RSSIs received by all Access Points from said clients show a downtrend, then it is determined that the fault is located in the cable or aerial of said client; otherwise, if the RSSIs received by all Access Points from the clients are normal values, then it is determined that the fault is located in the receiver of the wireless module of said client.
11. The method for diagnosis of fault in vehicular wireless communication systems according to claim 4, 5 or 6, characterized in that, in said step (3) , if the RSSIs transmitted by a particular client and then received by at least part of the Access Point show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said Access Point.
12. The method for diagnosis of fault in vehicular wireless communication systems according to claim 11, characterized in that, if the RSSIs received by said clients from the Access Points show a downtrend, then it is determined that the fault is located in the cable or aerial of said client; otherwise, if the RSSIs received by said clients from the Access Points are normal values, then it is determined that the fault is located in the receiver of the wireless module of said client.
13. The method for diagnosis of fault in vehicular wireless communication systems according to claim 4, 5 or 6, characterized in that, in said step (3) , if the RSSIs received by an Access Point from all the clients show a downtrend in said time interval, then it is determined that the fault is located in the radio frequency system of said Access Point.
14. The method for diagnosis of fault in vehicular wireless communication systems according to claim 13, characterized in that, if the RSSIs of said Access Point received by all clients show a downtrend, then it is determinted that the fault is located in the cable or aerial of said Access Point; otherwise, if the RSSIs of said Access Point received by all clients are normal values, then it is determined that the fault is located in the receiver of the wireless module of said Access Point.
15. The method for diagnosis of fault in vehicular wireless communication systems according to any one claim selected from claim 1 to 6, characterized in that, said vehicular wireless communication systems are wireless LAN systems.
16. A system for diagnosis of fault in vehicular wireless communication systems, wherein, said vehicular wireless communication system comprises a backbone network, more than one Access Point connected to said backbone network and more than one client, characterized in that, said system also comprises a fault diagnosis server, each of said Access Points receives the RSSIs transmitted by each of the clients connected with them, each of said clients receives the RSSIs transmitted by the Access Points connected with them, and then said Access Points and said clients respectively transmit the received RSSIs to said fault diagnosis server.
17. The system for diagnosis of fault in vehicular wireless communication systems according to claim 16, characterized in that, said fault diagnosis server comprises a statistical module and a diagnosis module, said statistical module is used for storing the received RSSIs and then collecting the statistics of the stored RSSIs; said diagnosis module is used for determining the fault in said vehicular wireless communication systems based on said statistical values.
18. A device for diagnosis of fault in vehicular wireless communication systems, characterized in that, said device for diagnosis of fault in vehicular wireless communication systems comprises more than one first subdevices and more than one second subdevices, said first subdevices receive the RSSIs transmitted by each of the second subdevices connected with them, while said second subdevices receive the RSSIs transmitted by each of the first subdevices connected with them, said first subdevices and said second subdevices respectively collect the statistics of the RSSIs received by them and determine the fault in said vehicular wireless communication systems based on said statistical values.
19. The device for diagnosis of fault in vehicular wireless communication systems according to claim 18, characterized in that, said first subdevice and second subdevice are respectively the Access Point and the client of the wireless LAN.
PCT/EP2011/050339 2010-01-15 2011-01-12 A method for diagnosis of fault in vehicular wireless communication systems WO2011086094A1 (en)

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