CN105491685A - Distributed multi-hop networking method applicable to double heading marshalling of heavy load locomotive - Google Patents
Distributed multi-hop networking method applicable to double heading marshalling of heavy load locomotive Download PDFInfo
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- CN105491685A CN105491685A CN201511008682.1A CN201511008682A CN105491685A CN 105491685 A CN105491685 A CN 105491685A CN 201511008682 A CN201511008682 A CN 201511008682A CN 105491685 A CN105491685 A CN 105491685A
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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
- 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
- H04L41/0668—Management of faults, events, alarms or notifications using network fault recovery by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/19—Connection re-establishment
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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Abstract
The present invention discloses a distributed multi-hop networking method applicable to double heading marshalling of a heavy load locomotive. The method comprises: a current locomotive scans a channel; the current locomotive establish a network by itself if the current locomotive does not receive the NCFG information from other locomotives in a first preset time period; the current locomotive takes other locomotives as sponsor locomotives and joins the network where the sponsor locomotives are located if the current locomotive receives the NCFG information from other locomotives in the first preset time period and receives the NCFG information from the same locomotive twice in a second preset time period. According to the invention, each locomotive is taken as one network node and completes network entry, networking, network maintenance, resource scheduling and the like by themselves, therefore the reliability and the availability of the double heading marshalling of a heavy load locomotive are effectively enhanced, the robust networking is realized in the condition the locomotive breaks down or a link breaks down, and the network survivability is effectively improved.
Description
Technical field
The present invention relates to heavy loading locomotive marshalling technical field, particularly relate to a kind of distributed multihop network-building method being applicable to heavy loading locomotive heavily binding group.
Background technology
Along with the heavy loading of railway freight, there is limitation in the organizational systems only by single locomotive traction train: the tractive effort of single locomotive is not enough to draw the train of larger marshalling, and the coefficient of safety of train operation after train marshalling list extended length in addition reduces.Therefore heavy haul railway adopt Multiple driver communications within the same train start heavy-load combined train of growing up be development direction, and start heavy-load combined train first need solve locomotive double heading marshalling problem.
Locomotive double heading can be divided into zero distance heavily to join by heavily joining distance and heavily join at a distance.Zero distance heavily joins and refers to and be connected directly between together by multiple locomotive, does not hang together other vehicles between locomotive and locomotive.Multiple locomotive networking can be distributed power train by remote heavily connection, makes train obtain better pulling figure and braking characteristic.
Communication between current multi-locomotive generally adopts and heavily joins cable realization, this mode reliability is higher, but there is significant limitation: heavily connection cable is owing to vibrating damage of easily breaking in the operation of locomotive, affects the reliability of transfer of data, is not especially suitable for remote locomotive double heading; To connect and fixed-interlock cable or dismantled all is wasted time and energy at vehicles in addition, cause the waste of maintenance department labour.
Adopt wireless mode to realize the networking of multimachine car, more wired heavy being easy to operates, and need not dismantle heavy on line, cause extensive concern gradually.Current wireless heavy binding group can utilize cellular network (GSM-R/WCDMA/LTE network etc.) or complete based on radio station.Wireless heavy grouping method based on cellular network depends on static infrastructure, and comparatively large by such environmental effects, once break down in base station, whole marshalling network will be paralysed.Wireless heavy linked method based on radio station adopts centralized single-hop networking substantially, namely sets up communication respectively by master control locomotive and each slave controller car, and master control locomotive sends grouping command, and slave controller car carries out corresponding operating according to grouping command.The hidden danger that this kind of mode exists is when master control locomotive breaks down, and whole grouping procedures all will be difficult to carry out.
Existing another kind of mode is based on Alley Oop communication mechanism, and master control locomotive travels through all slave controller vehicle radio data by space relay mode, thus ensures the correctness of marshalling.What this mode adopted is centralized multihop network, and along with the increase of marshalling number of locomotives, jumping figure increases, and the speed that realizes of this network can be very slow, and once a certain locomotive breaks down, whole grouping procedures will be paralysed.
Summary of the invention
The object of the present invention is to provide a kind of distributed multihop network-building method being applicable to heavy loading locomotive heavily binding group, effectively to improve efficiency and the communication reliability that heavy loading locomotive reconnects marshalling.
For achieving the above object, the present invention adopts following technical proposals:
Be applicable to a distributed multihop network-building method for heavy loading locomotive heavily binding group, comprise the following steps:
Current locomotive scanning channel;
If described current locomotive does not receive the NCFG message from other locomotives in the first predetermined amount of time, then described current locomotive self-meshing;
If described current locomotive receives the NCFG message from other locomotives in described first predetermined amount of time, and in the second predetermined amount of time, receive the twice NCFG message from other locomotives same, then these other locomotives are set to patronage locomotive by described current locomotive, and add the network at described patronage locomotive place.
Preferably, described first predetermined amount of time is identical with the starting point of described second predetermined amount of time, and the duration of described second predetermined amount of time is greater than the duration of described first predetermined amount of time.
Preferably, the step of described current locomotive self-meshing comprises:
Described network number as network number, and adds in NCFG message by described current locomotive by the node number of self;
The NCFG message being added with described network number is carried out periodic broadcast by described current locomotive.
Preferably, these other locomotives are set to patronage locomotive by described current locomotive, and the step adding the network at described patronage locomotive place also comprises:
NENT message is utilized to complete between described current locomotive with described patronage locomotive synchronous.
Preferably, utilize NENT message to complete synchronous step between described current locomotive with described patronage locomotive to comprise:
Described current locomotive sends NENT:Request message request to described patronage locomotive and networks;
Described patronage locomotive judges whether himself meets patronage condition, if described patronage locomotive judges himself to meet patronage condition, then sends NENT:Open message to described current locomotive, opens patronage;
Described current locomotive carries out essence after receiving described NENT:Open message synchronous, and sends NENT:Close message to described patronage locomotive;
Send NENT:ACK message to described current locomotive after described patronage locomotive receives described NENT:Close message, confirm that described current locomotive networks successfully.
Preferably, when described patronage locomotive judges that himself does not meet patronage condition, send NENT:Reject message to described current locomotive, described current locomotive restarts scanning channel after receiving described NENT:Reject message.
Preferably, the step that after described method also comprises networking, network is safeguarded automatically, this step comprises:
Each locomotive in network periodically sends NCFG message, and this NCFG message carries all hop neighbor information sending locomotive;
After other locomotives receive the NCFG message carrying all hop neighbor information sending locomotive, according to a hop neighbor information of this NCFG information updating self, and upgrade local jumping or a two-hop neighbors information according to neighbor list information.
Preferably, described method also comprises the step of scheduling of resource in networking process, and this step comprises:
The control message transmitting time transmission DSCH-Request message obtained elected by resource request locomotive, and described DSCH-Request message comprises bandwidth request information and this resource request locomotive available time slot table;
After resource authorization locomotive receives described DSCH-Request message, the available time slot table of described resource request locomotive and local slot table are contrasted, obtains public slot table;
For described resource authorization locomotive: if described public slot table can meet the bandwidth demand of described resource request locomotive, then reply DSCH-Grant message to described resource request locomotive, upgrade local slot table, described DSCH-Grant message comprises the mandate slot table of resource authorization locomotive simultaneously; If described public slot table can not meet the bandwidth demand of described resource request locomotive, then reply DSCH-Failure message to described resource request locomotive, now described resource authorization locomotive is left intact;
For described resource request locomotive: if described resource request locomotive receives described DSCH-Grant message, then upgrade local slot table according to described mandate slot table, and reply DSCH-Confirm message to described resource authorization locomotive, carry the local slot table after renewal in described DSCH-Confirm message, then described resource request locomotive is pressed time slot according to mandate slot table and is sent data; If described resource request locomotive receives DSCH-Failure message, then abandon this time request, resend new DSCH-Request message.
Preferably, the networking step again when locomotive breaks down after described method also comprises networking, this step comprises:
When networking locomotive breaks down, using apart from described networking locomotive recently and the minimum locomotive of sequence number as networking locomotive, re-start networking, make other locomotives again access new network;
When non-networking locomotive breaks down, fall net with this locomotive for supporting the locomotive of locomotive, the locomotive falling net rescans channel, selects new patronage locomotive, and adds the network at new patronage locomotive place.
Preferably, the networking step again when communication link breaks down after described method also comprises networking, this step comprises:
When a jumping communication link between two locomotives of certain in network breaks down, utilize other locomotives adjacent with these two locomotives, adopt the mode of multi-hop to set up communication link with networking again.
The present invention has following beneficial effect:
Heavy-duty freight car provided by the present invention heavily binding distribution type multi-hop network-building method is different from the mode of the heavily connection cable connection that the marshalling of traditional heavy loading locomotive adopts and relies on fixed wireless access infrastructure to carry out the mode communicated, but with each locomotive for network node, complete the processes such as networking, networking, network operation, scheduling of resource voluntarily, effectively improve the reliabilty and availability of heavy loading locomotive heavily binding group, simultaneously when locomotive break down or link failure realize robust networking, effectively improve Survivabilities of Networks.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is a kind of flow chart being applicable to the distributed multihop network-building method of heavy loading locomotive heavily binding group that the embodiment of the present invention provides;
Fig. 2 is heavy loading locomotive heavily binding group multi-hop networking schematic diagram in the embodiment of the present invention;
Fig. 3 is the detail flowchart carrying out networking in the embodiment of the present invention between locomotive;
Fig. 4 is the process schematic carrying out between locomotive in the embodiment of the present invention communicating;
Fig. 5 is the robust networking process that communication link breaks down in situation.
Embodiment
In order to be illustrated more clearly in the present invention, below in conjunction with preferred embodiments and drawings, the present invention is described further.Parts similar in accompanying drawing represent with identical Reference numeral.It will be appreciated by those skilled in the art that specifically described content is illustrative and nonrestrictive, should not limit the scope of the invention with this below.
Fig. 1 is a kind of flow chart being applicable to the distributed multihop network-building method of heavy loading locomotive heavily binding group that the embodiment of the present invention provides, and as shown in Figure 1, the method comprises the following steps:
Current locomotive scanning channel;
If described current locomotive does not receive the NCFG message from other locomotives in the first predetermined amount of time, then described current locomotive self-meshing;
If described current locomotive receives the NCFG message from other locomotives in described first predetermined amount of time, and in the second predetermined amount of time, receive the twice NCFG message from other locomotives same, then these other locomotives are set to patronage locomotive by described current locomotive, and add the network at described patronage locomotive place.
That is, in the present invention, each locomotive is regarded as node in network to complete the steps such as the networking of each node, networking.Particularly, as shown in Figure 2, each locomotive in same marshalling can all be equipped with the transmission equipment 1 that at least one is used for realizing multi-hop networking function, this transmission equipment 1 possesses the function can receiving and dispatching NCFG message and NENT message, when networking process is opened, the transmission equipment 1 that each locomotive configures is started shooting.
Usually, NCFG message is sent by the node in network, and for adjacent node provides the basic communication information, node in a network all should broadcast NCFG message according to certain way; NENT message provides for new node acquisition is synchronous, carry out initialization, add network.Therefore, communication between each locomotive and scheduling of resource can be realized by being equipped with the transmission equipment possessing above-mentioned functions, completing networking process
Heavy-duty freight car provided by the present invention heavily binding distribution type multi-hop network-building method is different from the mode of the heavily connection cable connection that the marshalling of traditional heavy loading locomotive adopts and relies on fixed wireless access infrastructure to carry out the mode communicated, but with each locomotive for network node, complete the processes such as networking, networking, network operation, scheduling of resource voluntarily, effectively improve the reliabilty and availability of heavy loading locomotive heavily binding group, simultaneously when locomotive break down or link failure realize robust networking, effectively improve Survivabilities of Networks.
Preferably, described first predetermined amount of time is identical with the starting point of described second predetermined amount of time, and the duration of described second predetermined amount of time is greater than the duration of described first predetermined amount of time.This setup is convenient to understand and realize, and in practical operation, only need set two different time periods from same initial time respectively by timer.
Further, the step of described current locomotive self-meshing comprises:
Described network number as network number, and adds in NCFG message by described current locomotive by the node number of self;
The NCFG message being added with described network number is carried out periodic broadcast by described current locomotive.
Further, these other locomotives are set to patronage locomotive by described current locomotive, and the step adding the network at described patronage locomotive place also comprises:
NENT message is utilized to complete between described current locomotive with described patronage locomotive synchronous.This step specifically comprises:
Described current locomotive sends NENT:Request message request to described patronage locomotive and networks;
Described patronage locomotive judges whether himself meets patronage condition, if described patronage locomotive judges himself to meet patronage condition, then sends NENT:Open message to described current locomotive, opens patronage;
Described current locomotive carries out essence after receiving described NENT:Open message synchronous, and sends NENT:Close message to described patronage locomotive;
Send NENT:ACK message to described current locomotive after described patronage locomotive receives described NENT:Close message, confirm that described current locomotive networks successfully.
Correspondingly, (described patronage locomotive is typically referred to as the reason such as patronage locomotive of other locomotives) when described patronage locomotive judges himself not meet patronage condition, NENT:Reject message is sent to described current locomotive, described current locomotive restarts scanning channel after receiving described NENT:Reject message, finds new patronage locomotive.
Fig. 3 is the detail flowchart carrying out networking in the embodiment of the present invention between locomotive, and concrete networking process is as follows:
Current locomotive carries out initialization operation, and system resets the time, opening timing device, scanning channel;
Patronage locomotive found by current locomotive, in the time range of timer setting, if current locomotive searches out patronage locomotive, then open thick synchronizing process, otherwise current locomotive starts networking voluntarily;
Current locomotive initiates to supporting locomotive the request of networking, if receive the acceptance message of supporting locomotive to send in the time range of timer setting, then opens smart synchronizing process; If receive the refuse information that patronage locomotive sends, then current locomotive starts networking voluntarily;
Current locomotive complete essence synchronous after, initiate networking turn-off request to patronage locomotive, if receive the acknowledge message that patronage locomotive sends in the time range of timer setting, then current locomotive networks successfully, completes locomotive and enters network process.
It should be noted that, the time range of the timer setting mentioned in above-mentioned multiple step can be identical, also can be different, need to arrange according to specific circumstances, repeat no more herein.
Further, the step that after described method also comprises networking, network is safeguarded automatically, this step comprises:
Each locomotive in network periodically sends NCFG message, and this NCFG message carries all hop neighbor information sending locomotive;
After other locomotives receive the NCFG message carrying all hop neighbor information sending locomotive, according to a hop neighbor information of this NCFG information updating self, and upgrade local jumping or a two-hop neighbors information according to neighbor list information.
Can find out, the inventive method can carry out network operation voluntarily after networking, thus effectively improves the reliabilty and availability of heavy loading locomotive heavily binding group.
In order to the message coordinating each locomotive sends opportunity, avoid message transition collision, network-building method provided by the present invention also comprises the step of scheduling of resource in networking process, and as shown in Figure 4, this step comprises:
The control message transmitting time transmission DSCH-Request message obtained elected by resource request locomotive, and described DSCH-Request message comprises bandwidth request information and this resource request locomotive available time slot table;
After resource authorization locomotive receives described DSCH-Request message, the available time slot table of described resource request locomotive and local slot table are contrasted, obtains public slot table;
For described resource authorization locomotive: if described public slot table can meet the bandwidth demand of described resource request locomotive, then reply DSCH-Grant message to described resource request locomotive, upgrade local slot table, described DSCH-Grant message comprises the mandate slot table of resource authorization locomotive simultaneously; If described public slot table can not meet the bandwidth demand of described resource request locomotive, then reply DSCH-Failure message to described resource request locomotive, now described resource authorization locomotive is left intact;
For described resource request locomotive: if described resource request locomotive receives described DSCH-Grant message, then upgrade local slot table according to described mandate slot table, and reply DSCH-Confirm message to described resource authorization locomotive, carry the local slot table after renewal in described DSCH-Confirm message, then described resource request locomotive is pressed time slot according to mandate slot table and is sent data; If described resource request locomotive receives DSCH-Failure message, then abandon this time request, resend new DSCH-Request message.
In above process, the negotiation algorithm determination control message by improving between locomotive sends opportunity, avoids the collision of scheduling message, and heterogeneous networks application scenarios and network size support the dynamic conditioning of index avoidance; Resource negotiation is carried out alternately, to determine that data-message sends opportunity, collision free by distributed three-way handshake.
Further, the networking step again when locomotive breaks down after described method also comprises networking, this step comprises:
When networking locomotive breaks down, using apart from described networking locomotive recently and the minimum locomotive of sequence number as networking locomotive, re-start networking, make other locomotives again access new network;
When non-networking locomotive breaks down, fall net with this locomotive for supporting the locomotive of locomotive, the locomotive falling net rescans channel, selects new patronage locomotive, and adds the network at new patronage locomotive place.
In addition, the networking step again when communication link breaks down after described method also comprises networking, this step comprises:
When a jumping communication link between two locomotives of certain in network breaks down, utilize other locomotives adjacent with these two locomotives, adopt the mode of multi-hop to set up communication link with networking again.
As shown in Figure 5, when the communication link between locomotive A and locomotive B breaks down, locomotive A can utilize adjacent locomotive C to set up with locomotive B in a multi-hop fashion and communicate.
In sum, the present invention relates to and provides a kind of distributed multihop network-building method being applicable to heavy loading locomotive heavily binding group, and the robust networking in situation that this network-building method can realize automatically becoming net, network is safeguarded automatically, scheduling of resource, locomotive break down and communication link break down the functions such as the robust networking in situation.Be different from the mode of the heavily connection cable connection that the marshalling of traditional heavy loading locomotive adopts or rely on fixed wireless access infrastructure to carry out the mode communicated, the present invention with each locomotive for network node, complete the processes such as networking, networking, network operation, scheduling of resource voluntarily, effectively improve the reliabilty and availability of heavy loading locomotive heavily binding group, simultaneously when locomotive break down or link failure realize robust networking, effectively improve Survivabilities of Networks.
Obviously; the above embodiment of the present invention is only for example of the present invention is clearly described; and be not the restriction to embodiments of the present invention; for those of ordinary skill in the field; can also make other changes in different forms on the basis of the above description; here cannot give exhaustive to all execution modes, every belong to technical scheme of the present invention the apparent change of extending out or variation be still in the row of protection scope of the present invention.
Claims (10)
1. be applicable to a distributed multihop network-building method for heavy loading locomotive heavily binding group, it is characterized in that, comprise the following steps:
Current locomotive scanning channel;
If described current locomotive does not receive the NCFG message from other locomotives in the first predetermined amount of time, then described current locomotive self-meshing;
If described current locomotive receives the NCFG message from other locomotives in described first predetermined amount of time, and in the second predetermined amount of time, receive the twice NCFG message from other locomotives same, then these other locomotives are set to patronage locomotive by described current locomotive, and add the network at described patronage locomotive place.
2. method according to claim 1, is characterized in that, described first predetermined amount of time is identical with the starting point of described second predetermined amount of time, and the duration of described second predetermined amount of time is greater than the duration of described first predetermined amount of time.
3. method according to claim 1, is characterized in that, the step of described current locomotive self-meshing comprises:
Described network number as network number, and adds in NCFG message by described current locomotive by the node number of self;
The NCFG message being added with described network number is carried out periodic broadcast by described current locomotive.
4. method according to claim 1, is characterized in that, these other locomotives are set to patronage locomotive by described current locomotive, and the step adding the network at described patronage locomotive place also comprises:
NENT message is utilized to complete between described current locomotive with described patronage locomotive synchronous.
5. method according to claim 4, is characterized in that, utilizes NENT message to complete synchronous step and comprise between described current locomotive with described patronage locomotive:
Described current locomotive sends NENT:Request message request to described patronage locomotive and networks;
Described patronage locomotive judges whether himself meets patronage condition, if described patronage locomotive judges himself to meet patronage condition, then sends NENT:Open message to described current locomotive, opens patronage;
Described current locomotive carries out essence after receiving described NENT:Open message synchronous, and sends NENT:Close message to described patronage locomotive;
Send NENT:ACK message to described current locomotive after described patronage locomotive receives described NENT:Close message, confirm that described current locomotive networks successfully.
6. method according to claim 5, it is characterized in that, when described patronage locomotive judges that himself does not meet patronage condition, send NENT:Reject message to described current locomotive, described current locomotive restarts scanning channel after receiving described NENT:Reject message.
7. method as claimed in any of claims 1 to 6, is characterized in that, the step that after described method also comprises networking, network is safeguarded automatically, and this step comprises:
Each locomotive in network periodically sends NCFG message, and this NCFG message carries all hop neighbor information sending locomotive;
After other locomotives receive the NCFG message carrying all hop neighbor information sending locomotive, according to a hop neighbor information of this NCFG information updating self, and upgrade local jumping or a two-hop neighbors information according to neighbor list information.
8. method as claimed in any of claims 1 to 6, is characterized in that, described method also comprises the step of scheduling of resource in networking process, and this step comprises:
The control message transmitting time transmission DSCH-Request message obtained elected by resource request locomotive, and described DSCH-Request message comprises bandwidth request information and this resource request locomotive available time slot table;
After resource authorization locomotive receives described DSCH-Request message, the available time slot table of described resource request locomotive and local slot table are contrasted, obtains public slot table;
For described resource authorization locomotive: if described public slot table can meet the bandwidth demand of described resource request locomotive, then reply DSCH-Grant message to described resource request locomotive, upgrade local slot table, described DSCH-Grant message comprises the mandate slot table of resource authorization locomotive simultaneously; If described public slot table can not meet the bandwidth demand of described resource request locomotive, then reply DSCH-Failure message to described resource request locomotive, now described resource authorization locomotive is left intact;
For described resource request locomotive: if described resource request locomotive receives described DSCH-Grant message, then upgrade local slot table according to described mandate slot table, and reply DSCH-Confirm message to described resource authorization locomotive, carry the local slot table after renewal in described DSCH-Confirm message, then described resource request locomotive is pressed time slot according to mandate slot table and is sent data; If described resource request locomotive receives DSCH-Failure message, then abandon this time request, resend new DSCH-Request message.
9. method as claimed in any of claims 1 to 6, is characterized in that, the networking step again when locomotive breaks down after described method also comprises networking, and this step comprises:
When networking locomotive breaks down, using apart from described networking locomotive recently and the minimum locomotive of sequence number as networking locomotive, re-start networking, make other locomotives again access new network;
When non-networking locomotive breaks down, fall net with this locomotive for supporting the locomotive of locomotive, the locomotive falling net rescans channel, selects new patronage locomotive, and adds the network at new patronage locomotive place.
10. method as claimed in any of claims 1 to 6, is characterized in that, the networking step again when communication link breaks down after described method also comprises networking, and this step comprises:
When a jumping communication link between two locomotives of certain in network breaks down, utilize other locomotives adjacent with these two locomotives, adopt the mode of multi-hop to set up communication link with networking again.
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| CN114919629A (en) * | 2022-04-07 | 2022-08-19 | 北京交通大学 | Virtual reconnection-oriented high-speed train movement authorization calculation method |
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