CN109842464A - A kind of method, system and device retransmitting data packet - Google Patents
A kind of method, system and device retransmitting data packet Download PDFInfo
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- CN109842464A CN109842464A CN201710944656.2A CN201710944656A CN109842464A CN 109842464 A CN109842464 A CN 109842464A CN 201710944656 A CN201710944656 A CN 201710944656A CN 109842464 A CN109842464 A CN 109842464A
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Abstract
The invention discloses the method, apparatus and system that retransmit data packet, wherein in setup phase, each monitoring station acquisition on a train operation route obtains the information of the radio link quality of each monitoring position and is stored in train unit；In the operation phase, monitor the position that train is run on running route, when pre-determined distance before train operation distance monitoring position, determine the data packet retransmission number of monitoring position, determination basis be storage monitoring position radio link quality information；When train operation is to when monitoring position, the data packet retransmission number for monitoring position obtained according to determination retransmits data packet.The monitoring position has multiple on train path road.The number for retransmitting data packet is adaptively set dynamically wireless train control system of the invention for the different monitoring positions of each train at runtime, the re-transmission for carrying out data packet guarantees the robustness of wireless train control system and improves the efficiency of transmission of wireless train control system.
Description
Technical field
The present invention relates to the communication technology, in particular to a kind of method, system and device for retransmitting data packet.
Background technique
Solution to Train Controls such as subways is to establish wireless train control system.As shown in FIG. 1, FIG. 1 is
The wireless train control system structural schematic diagram that the prior art provides.The network side of wireless train control system 10 is redundancy ether
The backbone network 101 of net is provided with multiple wireless access point (AP) 102, AP102 along wireless train and is linked into the backbone network
In central processing unit or router, interface of the AP102 as wireless train control system passes through what is be arranged in AP102 train
Train unit (TU, Train Units) 103 can be linked into backbone network, carry out the transmission of data packet, and data packet is with wireless
The form of signaling is transmitted, and to realize that backbone network 101 controls wireless train, train unit 103 is wireless device.
In train have there are four be separately positioned on train front-end and back-end train unit be used for the same time with
Data packet is transmitted between backbone network.Along train in traveling process, by route different zones setting AP point with it is described
Data packet is transmitted between backbone network.
For wireless train control system to a train in the multiple Radio Links of same time maintenance, this controls wireless train
The robustness and stability of system propose requirement.In order to guarantee the robustness of wireless train control system, need to data packet
It is repeatedly retransmitted, is currently to be realized and will not be modified during the operation of train by the way of static state setting, i.e., in advance
If data packet retransmission number, retransmitted according to preset data packet retransmission number in train operation.In static configuration,
The number of retransmissions of the data packet of configuration is compromised simultaneously takes into account the efficiency of transmission and robustness of wireless train control system: if setting
Number of retransmissions it is more, then the re-transmission of a large amount of data packet will increase interference and delay in wireless train control system, and be arranged
Number of retransmissions it is few, then reduce to the robustness under the conditions of external interference or the covering of radio suboptimum etc..
Summary of the invention
In view of this, the invention proposes a kind of method in re-transmission data packet, this method can be adaptively set dynamically
The number for retransmitting data packet, carries out the re-transmission of data packet.
The invention also provides a kind of device for retransmitting data packet, which can adaptively be set dynamically re-transmission data packet
Number, carry out the re-transmission of data packet.
The invention also provides a kind of system for retransmitting data packet, which can adaptively be set dynamically re-transmission data packet
Number, carry out the re-transmission of data packet.
The present invention is implemented as follows:
The present invention includes a kind of method for retransmitting data packet characterized by comprising
During a train operation, the position that the train is reached is monitored；
Predict the train in the radio link quality of a second place；
When the train reaches a first position, according to the train of prediction in the wireless of the second place
Link-quality determines the train in the data packet retransmission number of the second place, wherein described in the train first reaches
First position reaches the second position afterwards；
When the train reaches the second position, the train is controlled according to the determining data packet retransmission number
The transmission for carrying out data packet realizes dynamic setting and retransmits data packet number, the Radio Link matter in the monitored region of foundation
Information is measured, to improve the stability and robustness of wireless train control system.
This method further comprises: when the train runs to the second position in the past, acquiring and stores the column
Information of the vehicle in the radio link quality of the second position；
Predict the train in the radio link quality of a second place, comprising: according to acquiring in advance and store institute
Train is stated in the information of the radio link quality of the second place, predicts the train in the radio chains of the second position
Road quality.In this way, acquisition radio link quality information was completed in the period before, it is not take up this and determines number of retransmissions
When operation time so that processing faster.
Preferably, according to acquiring in advance and storing the train in the letter of the radio link quality of the second place
Breath, predicts the train in the radio link quality of the second position, comprising:
The column for acquiring and storing when reaching the second position in upper primary operational process according only to the train
Vehicle predicts the train in the Radio Link matter of the second position in the information of the radio link quality of the second position
Amount；Or
The institute for acquiring and storing when reaching the second position in the operational process for setting number before to the train
Train is stated after different weighted values is respectively set in the information of at least two radio link qualities of the second position, using adding
Weight average algorithm obtains the train in the information of the radio link quality of the second position after calculating.In this way, using different
Mode the wireless link information of acquisition is updated, ensure that the accuracy of wireless link information collected.
The invention also includes a kind of methods for retransmitting data packet characterized by comprising
Determine the number of retransmissions in a train travelling process by sending data packet when an access point AP；
The number of retransmissions that data packet is sent when passing through the AP according to the determining train, determines the AP in the column
Vehicle sends the number of retransmissions of data packet to the train when passing through the AP.In this way, data packet is sent to train in AP, it can also be with
With reference to obtained data packet retransmission number is determined at train end, processing is simple and improves system stability.
The present invention include it is a kind of retransmit data packet device characterized by comprising a predicting unit, locating unit,
One arithmetic element and an execution unit, wherein
The predicting unit, for predicting the train in the radio link quality of a second place；
The positioning unit, for the position that the train is reached being monitored, in institute during a train operation
When stating train one first position of arrival, Xiang Suoshu arithmetic element sends the first notice；A second is reached in the train
When setting, Xiang Suoshu execution unit sends the second notice；The arithmetic element, when for receiving the first notice, according to prediction
Radio link quality of the train in the second place determines the train in the data packet weight of the second place
Pass number, wherein the train first reaches the first position, reaches the second position afterwards, and by identified data packet
Number of retransmissions is sent to execution unit；The execution unit, for indicating the train according to described according to second notice
The data packet retransmission number that arithmetic element determines carries out the transmission of data packet.In this way, realizing dynamic setting retransmits data packet time
Number, the radio link quality information in the monitored region of foundation, to improve stability and the Shandong of wireless train control system
Stick.
Preferably, further include: an acquisition unit and a storage unit, wherein
The positioning unit is further used for when the train runs to the second position in the past, to the acquisition
Unit sends third notice；
The acquisition unit, for acquiring the train in the radio chains of the second position according to the third notice
The information of road quality, is sent to storage unit；
The storage unit, for storing radio chains of the train in the second position of the acquisition unit acquisition
The information of road quality.In this way, acquisition radio link quality information was completed in the period before, it is not take up this and determines weight
Operation time when number is passed, so that processing is faster.
Preferably, the device further include:
The predicting unit, is further used for,
When reaching the second position in upper primary operational process according only to the train that the storage unit stores
It acquires and the train that stores in the information of the radio link quality of the second position predicts the train described
The radio link quality of two positions；Or
The second is reached in the operational process for setting number before to the train of storage unit storage
It is acquired when setting and the train stored is respectively set not in the information of at least two radio link qualities of the second position
With weighted value after, the train is obtained after calculating using Weighted Average Algorithm in the radio link quality of the second position
Information.In this way, being updated in different ways to the wireless link information of acquisition, Radio Link letter collected ensure that
The accuracy of breath.
Invention additionally discloses a kind of devices for retransmitting data packet, comprising: a position units, a determination unit and one retransmit single
Member, wherein the position units pass through a second position for positioning a train in the process of running；It is described determining single
Member sending the number of retransmissions of data packet, determining the train when for passing through the second position according to the determining train
Send the number of retransmissions of data packet；The retransmission unit is counted for being sent the number of retransmissions of data packet using the train
It is transmitted according to packet.In this way, sending data packet to train in AP, it can also determine that obtained data packet retransmission is secondary with reference at train end
Number, processing is simple and improves system stability.
The present invention also provides a kind of trains, including the device described in any of the above embodiments for retransmitting data packet.This train can
Data packet number, the radio link quality in the monitored region of foundation, to improve wireless train control are retransmitted with dynamic setting
The stability and robustness of system processed.
The present invention also provides a kind of systems for retransmitting data packet, comprising: retransmits belonging to the device of data packet, the second position
Multiple AP and wireless train control system network side unit, wherein
The device for retransmitting data packet, for monitoring what the train was reached during a train operation
Position；Predict the train in the radio link quality of a second place；When the train reaches a first position,
Radio link quality according to the train of prediction in the second place determines the train in the second place
Data packet retransmission number, wherein the train first reaches the first position, reaches the second position afterwards；When the column
When vehicle reaches the second position, the train is controlled according to the determining data packet retransmission number, data packet is transferred to institute
Belong to multiple AP；
Multiple AP belonging to the second position, for will be sent from the received data packet of the device for retransmitting data packet
To the wireless train control system network side unit；
The wireless train control system network side unit, for receiving the data that multiple AP are sent belonging to the second position
Packet.In this way, this system provided, which can be set dynamically, retransmits data packet number, the Radio Link in the monitored region of foundation
Quality information, to improve the stability and robustness of wireless train control system.
Within the system, multiple AP belonging to the second position are also used to pass using the device for retransmitting data packet
The data packet retransmission number of transmission of data packet will be sent to the re-transmission data from the wireless train control system network side unit
The device of packet；
The device for retransmitting data packet is also used to multiple AP received data packets belonging to the second position；
The wireless train control system network side unit is also used to send data packet to more belonging to the second position
A AP.The device for retransmitting data packet is the device of any of the above-described re-transmission data packet.The system is sent out in AP to train
Data packet is sent, can also be with reference to obtained data packet retransmission number be determined at train end, processing is simple and improves system stability.
The present invention provides a kind of device for retransmitting data packet, comprising: at least one processor, at least one processor and extremely
A few wireless communication port, in which:
At least one processor, for storing computer program；
At least one described wireless communication port, for sending and receiving data；
At least one described processor, for calling the computer program stored in at least one processor, with base
Re-transmission data as described in any one of the above embodiments are executed in the function that at least one described wireless communication port sends and receives data
The method of packet.In this way, realizing dynamic setting retransmits data packet number, the radio link quality letter in the monitored region of foundation
Breath, to improve the stability and robustness of wireless train control system.
The present invention provides a kind of machine readable storage medium, is stored thereon with machine readable code；The machine readable generation
The method that code can be executed by a processor and realize above-mentioned re-transmission data packet.It realizes dynamic setting and retransmits data packet time
Number, the radio link quality information in the monitored region of foundation, to improve stability and the Shandong of wireless train control system
Stick.
From above scheme as can be seen that method provided by the invention, method and device, in setup phase, in a train
Each monitoring station acquisition on running route obtains the information of the radio link quality of each monitoring position and storage；It is running
Stage, the position that is run on running route of monitoring train, when pre-determined distance before train operation distance monitoring position, really
Surely monitor position data packet retransmission number, determination basis be storage monitoring position radio link quality information；When
Train operation, according to the data packet retransmission number for determining obtained monitoring position, retransmits data packet to when monitoring position.The prison
Location is set on train path road with multiple.As can be seen that wireless train control system of the invention is directed to each train
The number for retransmitting data packet is adaptively set dynamically in different monitoring positions at runtime, carries out the re-transmission of data packet, guarantees nothing
The robustness of alignment vehicle control and the efficiency of transmission for improving wireless train control system.
Detailed description of the invention
Below will detailed description of the present invention preferred embodiment by referring to accompanying drawing, make those skilled in the art more
Clear above and other feature and advantage of the invention, in attached drawing:
Fig. 1 is the wireless train control system structural schematic diagram that the prior art provides；
Fig. 2 is the method flow diagram provided by the invention that data packet is retransmitted in wireless train control system；
Fig. 3 is device one structural schematic diagram provided by the invention that data packet is retransmitted in wireless train control system；
Fig. 4 is device two structural schematic diagram provided by the invention that data packet is retransmitted in wireless train control system；
Fig. 5 is the system structure diagram provided by the invention that data packet is retransmitted in wireless train control system；
Fig. 6 is device three structural schematic diagram provided by the invention that data packet is retransmitted in wireless train control system.
The label declaration being related to
| 201~204 | The step of involved in Fig. 2 |
| 301 | Predicting unit |
| 302 | Positioning unit |
| 303 | Arithmetic element |
| 304 | Execution unit |
| 305 | Acquisition unit |
| 306 | Storage unit |
| 401 | Position units |
| 402 | Determination unit |
| 403 | Retransmission unit |
| 501 | Train system unit |
| 502 | Multiple access points belonging to the second position |
| 503 | Wireless train control system network side unit |
| 601 | Memory |
| 602 | Processor |
| 603 | Wireless communication port |
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, by the following examples to of the invention further detailed
It describes in detail bright.
In order to guarantee the robustness and stability of wireless train control system, not only need to eliminate participation data packet transmission
The failure of each component units, but also need along train from a compass of competency AP to another compass of competency AP when,
Transmission caused by eliminating due to relatively slow switching AP transmission data packet.In this case, even if wireless train
Control system has good radio coverage rate along train, it is also possible to during train operation sometimes, column
Two train units in vehicle participate in the process of transmission data packet, and other train units are then busy with the handoff procedure of AP.
In order to guarantee that wireless train control system can be received in transmission data packet, that is, improve wireless train control system
Redundancy, especially transmit data packet it is not satisfactory in the case where, such as suboptimum radio is covered on along train, Huo Zhelie
Vehicle is there along stronger radio interference, so that it may which currently available wireless interface is arranged can configure to what data packet was retransmitted
Parameter,
In the background technology, wireless train control system introduces the concept of airlink (AIRLINK) re-transmission.
AIRLINK, which is retransmitted, is different from based on WLAN data packet retransmission scheme, that is, defines in the IEEE 802.11 standards oneself
Dynamic retransmission request (ARQ) concept, if being not received by confirmation (ACK) in window at the appointed time after sending data packet and disappearing
Breath is just retransmitted.Due to ceaselessly running along train, different time points access different AP, retransmit data using ARQ concept
Packet, network side can not receive the ACK message of data packet, therefore ARQ concept can not be by wireless train control system application.
AIRLINK is retransmitted by the way of are as follows: data packet is regardless of whether be delivered successfully, and multiple identical copies of data packet are in setting
It is transmitted on currently available AP.Herein, the quantity of multiple identical copies of data packet can configure, that is, the weight of data packet
Passing number can configure, but be static configuration, will not be modified during the operation of wireless train control system.Due to being quiet
The number of retransmissions of state configuration data packet, so and not can guarantee the stability and robustness of wireless train control system.
The present invention in order to guarantee wireless train control system robustness and improve wireless train control system transmission effect
Rate needs accurately to be arranged the number that wireless train control system retransmits data packet.Therefore, the present invention is directed to train, dynamic setting
The data packet retransmission numbers of its different monitoring position on working line, which can be with real-time update.
Specifically, each monitoring station acquisition on a train operation route obtains each prison in setup phase
The information of the radio link quality that location is set and storage；In the operation phase, the position that train is run on running route is monitored,
Train operation determines the data packet retransmission number of monitoring position apart from when monitoring the pre-determined distance before position, determination basis
It is the information of the radio link quality of the monitoring position of storage；When train operation to prison when monitoring position, obtained according to determination
The data packet retransmission number that location is set retransmits data packet.The monitoring position has multiple on train path road.
In this way, wireless train control system of the invention is adaptive for the different monitoring positions of each train at runtime
Dynamic setting retransmits the number of data packet, carries out the re-transmission of data packet, guarantees the robustness and raising of wireless train control system
The efficiency of transmission of wireless train control system.
Fig. 2 is the method flow diagram provided by the invention that data packet is retransmitted in wireless train control system, specific to walk
Suddenly are as follows:
Step 201, during a train operation, monitor the position that the train is reached；
Step 202 predicts the train in the radio link quality of a second place；
Step 203, when the train reach a first position when, according to the train of prediction in the second position
The radio link quality at place determines the train in the data packet retransmission number of the second place, wherein the train is first
The first position is reached, reaches the second position afterwards；
Step 204, when the train reach the second position when, control the train according to the determining data packet
The transmission of number of retransmissions progress data packet.
In the method, determine the train described when the train reaches a first position described in step 203
The process of the data packet retransmission number of the second place, when being when reaching a first position and reaching a second position
Between be calculated on running route.
In the method, the transmission of carry out data packet described in step 204 is by least one train list on train
Member transmission data packet.
This method further comprises: when the train runs to the second position in the past, acquiring and stores the column
Information of the vehicle in the radio link quality of the second position；Acquisition when, in different time points on acquire repeatedly.
Predict the train in the radio link quality of a second place, comprising: according to acquiring in advance and store institute
Train is stated in the information of the radio link quality of the second place, predicts the train in the radio chains of the second position
Road quality.
In the method, according to acquiring in advance and store the train in the radio link quality of the second place
Information predicts the train in the radio link quality of the second position, comprising:
The column for acquiring and storing when reaching the second position in upper primary operational process according only to the train
Vehicle predicts the train in the Radio Link matter of the second position in the information of the radio link quality of the second position
Amount；Or
The institute for acquiring and storing when reaching the second position in the operational process for setting number before to the train
Train is stated after different weighted values is respectively set in the information of at least two radio link qualities of the second position, using adding
Information of the train that weight average algorithm is obtained and stored after calculating in the radio link quality of the second position.
In the method, the process for the position that the monitoring train is reached namely to the position fixing process of train,
It may include various ways, such as:
Multiple transponders or sensor are set on the running route of the train；
In the operational process of the train, what the answer signal or receiving sensor for receiving the transponder transmission were sent
Transducing signal；
According to the received response message of institute or a heat transfer agent, and the mileage counter numerical value of the train obtained, it calculates
The running position of the train is obtained, the position that the train is reached is determined according to the running position of the train；
Or include: in the operational process of the train, the affiliated access point AP in position that is reached with the train into
Row information interaction, determines the position that the train is reached.
In the method, the information of the radio link quality includes at least one in following message:
Acquire the time parameter of the information of the radio link quality；
The location information of the second position；
The train sends the packet loss of data packet in the second position；
The information of the signal receiving strength for the wireless access point AP that the train receives in the second position；
The data packet transmission rates of the train in the second position；And
The data packet transmission delay of the train in the second position.
In the method, the instruction train carries out the transmission of data packet according to identified data packet retransmission number are as follows:
Indicate that the train is passed data packet by multiple AP belonging to the second position according to identified data packet retransmission number
It is defeated by the network side of wireless train control system.
In addition, multiple AP belonging to the train also can retransmit data packet, detailed process to the train are as follows:
Determine the number of retransmissions in a train travelling process by sending data packet when an access point AP；
The number of retransmissions that data packet is sent when passing through the AP according to the determining train, determines the AP in the column
Vehicle sends the number of retransmissions of data packet to the train when passing through the AP.
It gives one example explanation, the radio link quality information for monitoring train position can obtain in the following ways:
First step, during train operation, to the positioning of monitoring position, the benchmark of the positioning can be monitoring position
The monitoring position of AP or other settings belonging to setting.
In this step, to monitoring position positioning there are many kinds of, such as:
First way, monitoring position along train operation are arranged transponder, train by when receive response and believe
Number, train position is determined according to the mileage counter and answer signal that are arranged in train, train position is confirmed with this
It is which monitoring position；It is of course also possible to which other sensors are arranged in the monitoring along train operation, when train passes through
Transducing signal is sent to train, train determines train position according to the mileage counter and inductive signal of setting, with this
Which monitoring position confirmation train position is；
The second way, wireless train control system send location information to the train unit in train, train by AP
In train unit pass through the location information that interacts between AP and wireless train control system, determine the monitoring position of train；
The third mode can also transport if train is not linked into wireless train control system currently in train
During row, the train unit of train determines whether accessible AP, by whether can be determined in a manner of wireless access AP,
Using the affiliated compass of competency AP of process, the monitoring position of train is determined.
Second step, by the current time of train operation, monitoring position and the radio link quality information for monitoring position
It is corresponded to；
In this step, the current time includes date and time, the radio link quality information, including but unlimited
It is transmitted in acquisition time parameter, the second location information, data packet packet loss, train radio joint strength parameter and data packet
Rate etc..
Third step, by the current time of train operation, monitoring position and the radio link quality information for monitoring position
It is corresponded to.
Storage mode can be stored using journal file, it is of course also possible to use other more suitable storage formats into
Row storage, is stored in the storage unit of train setting.
In the method, since wireless train is in every day or per several days all can be in the same time period of same route
Operation, the collection process can repeat in setting in the not same runing time section of same date for train, and will newly adopt
The old collected data of the data cover collected abandon old collected information, to the collected data real-time update of institute.
That is, in the method, the radio link quality information of the monitoring position of storage are as follows: in running route
On, the radio link quality information of the monitoring position in different time periods of setting.And according to the period apart from current slot
Distance is updated, and the radio link quality information stored is the radio link quality information nearest apart from current slot.
In the step 203 of the method, the process of the determination are as follows:
Using the radio link quality information of the second position of storage as input parameter, to guarantee wireless train control
The robustness of system and the efficiency of transmission of raising wireless train control system are as base condition, using the adaptive calculation of setting
The number of the re-transmission data packet of the second position is calculated in method.
That is, adaptive algorithm retrieves the radio link quality letter of each monitoring position of storage on train path
The historical data of breath, these historgraphic data recordings monitoring position of train are preset with mileage interval between the monitoring position,
The mileage interval can also be set based on AP.The affiliated AP passed through when the date in same monitoring position before train.This is adaptive
Algorithm is answered based on the packet loss in historical data and reducing re-transmission data packet number needs wireless train control system to be achieved to pass
Defeated reliability, is calculated.This re-transmission data packet number being calculated is recalculated according to the update of historical data
And it updates.
In addition, AP in wireless train control system can based on the data packet retransmission number for the monitoring position administered,
The data packet that wireless train control system network side is sent is transferred to the train unit of train, AP is the train list according to train
The data packet retransmission number of member transmission data packet determines the number of downlink retransmitted data packet.
Fig. 3 is the apparatus structure schematic diagram provided by the invention that data packet is retransmitted in wireless train control system, the dress
It sets and method shown in Fig. 2 can be performed.The device a can include: predicting unit 301, locating unit 302, an arithmetic element 303
An and execution unit 304, wherein
The predicting unit 301, for predicting the train in the radio link quality of a second place；
The positioning unit 302, for monitoring the position that the train is reached during a train operation,
When the train reaches a first position, Xiang Suoshu arithmetic element 303 sends the first notice；One is reached in the train
When the second position, Xiang Suoshu execution unit 304 sends the second notice；The arithmetic element 303, for receiving the first notice
When, the radio link quality according to the train of prediction in the second place determines the train in the second position
The data packet retransmission number at place, wherein the train first reaches the first position, reaches the second position afterwards, and by institute
Determining data packet retransmission number is sent to execution unit 304；The execution unit 304, for referring to according to second notice
Show that the train unit in the train carries out the biography of data packet according to the data packet retransmission number that the arithmetic element 303 determines
It is defeated.
In the apparatus, further includes: an acquisition unit 305 and a storage unit 306, wherein
The positioning unit 302 is further used for when the train runs to the second position in the past, and Xiang Suoshu is adopted
Collect unit 305 and sends third notice；
The acquisition unit 305, for acquiring the train in the wireless of the second position according to the third notice
The information of link-quality is sent to storage unit 306；
The storage unit 306, for storing the train of the acquisition of acquisition unit 305 in the second position
The information of radio link quality.
In the apparatus, further includes: the predicting unit 301 is further used for,
The second position is reached in upper primary operational process according only to the train of the storage unit 306 storage
When acquire and the train that stores in the information of the radio link quality of the second position predicts the train described
The radio link quality of the second position；Or
Described second is reached in the operational process for setting number before to the train of the storage unit 306 storage
It is acquired when position and the train stored is respectively set in the information of at least two radio link qualities of the second position
After different weighted values, the train is obtained after calculating using Weighted Average Algorithm in the radio link quality of the second position
Information.
In the apparatus, for the positioning unit 302 in the operational process of the train, the train is arranged in reception
The response message or heat transfer agent that multiple transponders on running route or sensor are sent, according to the received response message of institute or
Heat transfer agent, and obtain the train mileage counter numerical value, the running position of the train is calculated, according to described
The running position of train determines the position that the train is reached；Or in the operational process of the train, with the train
The affiliated access point AP in the position reached carries out information exchange, determines the position that the train is reached.
In the apparatus, the execution unit 304 is according to second notice, indicate the train unit of the train according to
Data packet is transferred to wireless train control by multiple AP belonging to the second position by identified data packet retransmission number
The network side of system.
In the apparatus, the radio link quality information includes: acquisition time parameter, the second location information, number
According to packet packet loss, train radio joint strength parameter and data packet transmission rates.
Other optional implementations of the device can refer to Fig. 2 and its corresponding description, and which is not described herein again.
The invention also includes a kind of devices, are AP, as shown in Figure 4, comprising: a position units 401, a determination unit 402
With a retransmission unit 403, wherein
The position units 401 pass through a second position for positioning a train in the process of running；
The determination unit 402 sends data packet when for passing through the second position according to the determining train
Number of retransmissions determines that the train sends the number of retransmissions of data packet；
The retransmission unit 403 carries out data packet transmission for sending the number of retransmissions of data packet using the train.
The invention also includes a kind of train, the device including re-transmission data packet described in Fig. 3.
Fig. 5 is the system structure diagram provided by the invention that data packet is retransmitted in wireless train control system, comprising:
Including: includes: to retransmit multiple AP502 and wireless train control system network belonging to the device 501 of data packet, the second position
Side unit 503, wherein
The device 501 for retransmitting data packet, for monitoring the train and being reached during a train operation
Position；Predict the train in the radio link quality of a second place；When the train reaches a first position
When, the radio link quality according to the train of prediction in the second place determines the train in the second position
The data packet retransmission number at place, wherein the train first reaches the first position, reaches the second position afterwards；When described
When train reaches the second position, controls the train and be transferred to data packet according to the determining data packet retransmission number
Affiliated multiple AP502；
Multiple AP502 belonging to the second position, for by from it is described retransmit data packet the received data of device 501
Packet is sent to the wireless train control system network side unit 503；
The wireless train control system network side unit 503 is sent for receiving multiple AP502 belonging to the second position
Data packet.
Within the system, multiple AP502 belonging to the second position are also used to using the device for retransmitting data packet
The data packet retransmission number of 501 transmission data packets, will be sent to described from the wireless train control system network side unit 503
Retransmit the device 501 of data packet；
The device 501 for retransmitting data packet is also used to multiple AP502 received data packets belonging to the second position；
The wireless train control system network side unit 503 is also used to send data packet to belonging to the second position
Multiple AP502.
Within the system, the device 501 for retransmitting data packet is the device of re-transmission data packet described in any Fig. 3.
The invention also includes a kind of devices for retransmitting data packet, as shown in fig. 6, Fig. 6 is provided by the invention in no alignment
It includes: at least one processor 601, at least one processor that three structural schematic diagram of device of data packet is retransmitted in vehicle control
602 and at least one wireless communication port 603, in which:
At least one processor 601, for storing computer program；
At least one described wireless communication port 603, for sending and receiving data；
At least one described processor 602, for calling the computer journey stored in at least one processor 601
Sequence executes re-transmission data described in Fig. 2 with the function of sending and receiving data based at least one described wireless communication port 603
The method of packet.
The invention also discloses a kind of machine readable storage mediums, are stored thereon with machine readable code；The machine can
Read the method that code can be executed by a processor and realize re-transmission data packet as described in Figure 2.
Using the present invention, it can predict that train monitors position with the presence or absence of external strong jamming on working line, and according to pre-
The first adaptively selected very high number for retransmitting data packet, to ensure that operation control of the wireless train control system to train
The stability of system.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (14)
1. a kind of method for retransmitting data packet characterized by comprising
During a train operation, the position that the train is reached is monitored；
Predict the train in the radio link quality of a second place；
Radio Link when the train reaches a first position, according to the train of prediction in the second place
Quality determines the train in the data packet retransmission number of the second place, wherein the train first reaches described first
Position reaches the second position afterwards；
When the train reaches the second position, controls the train and carried out according to the determining data packet retransmission number
The transmission of data packet.
2. the method as described in claim 1, which is characterized in that
This method further comprises: when the train runs to the second position in the past, acquiring and stores the train and exist
The information of the radio link quality of the second position；
Predict the train in the radio link quality of a second place, comprising: according to acquiring in advance and store the column
Vehicle predicts the train in the Radio Link matter of the second position in the information of the radio link quality of the second place
Amount.
3. method according to claim 2, which is characterized in that according to acquiring in advance and store the train in the second
The information for setting the radio link quality at place predicts the train in the radio link quality of the second position, comprising:
The train for acquiring and storing when reaching the second position in upper primary operational process according only to the train exists
The information of the radio link quality of the second position predicts the train in the radio link quality of the second position；Or
The column for acquiring and storing when reaching the second position in the operational process for setting number before to the train
Vehicle is flat using weighting after different weighted values is respectively set in the information of at least two radio link qualities of the second position
Information of the train in the radio link quality of the second position after equal algorithm calculates.
4. a kind of method for retransmitting data packet characterized by comprising
Determine the number of retransmissions in a train travelling process by sending data packet when an access point AP；
The number of retransmissions that data packet is sent when passing through the AP according to the determining train, determines that the AP is passed through in the train
The number of retransmissions of data packet is sent when crossing the AP to the train.
5. a kind of device for retransmitting data packet characterized by comprising a predicting unit (301), locating unit (302), one
Arithmetic element (303) and an execution unit (304), wherein
The predicting unit (301), for predicting the train in the radio link quality of a second place；
The positioning unit (302), for monitoring the position that the train is reached during a train operation,
When the train reaches a first position, Xiang Suoshu arithmetic element (303) sends the first notice；One is reached in the train
When the second position, Xiang Suoshu execution unit (304) sends the second notice；
The arithmetic element (303), when for receiving the first notice, according to the train of prediction in the second place
Radio link quality determine the train in the data packet retransmission number of the second place, wherein the train arrives first
Up to the first position, the second position is reached afterwards, and identified data packet retransmission number is sent to execution unit
(304)；
The execution unit (304), for indicating the train according to the arithmetic element (303) according to second notice
Determining data packet retransmission number carries out the transmission of data packet.
6. device as claimed in claim 5, which is characterized in that further include: an acquisition unit (305) and a storage unit
(306), wherein
The positioning unit (302) is further used for when the train runs to the second position in the past, to the acquisition
Unit (305) sends third notice；
The acquisition unit (305), for acquiring the train in the radio chains of the second position according to the third notice
The information of road quality is sent to storage unit (306)；
The storage unit (306), for storing the train of the acquisition unit (305) acquisition in the second position
The information of radio link quality.
7. device as claimed in claim 6, which is characterized in that
The predicting unit (301), is further used for,
When reaching the second position in upper primary operational process according only to the train that the storage unit (306) store
It acquires and the train that stores in the information of the radio link quality of the second position predicts the train described
The radio link quality of two positions；Or
The second is reached in the operational process for setting number before to the train of the storage unit (306) storage
It is acquired when setting and the train stored is respectively set not in the information of at least two radio link qualities of the second position
With weighted value after, the train is obtained after calculating using Weighted Average Algorithm in the radio link quality of the second position
Information.
8. it is a kind of retransmit data packet device characterized by comprising a position units (401), a determination unit (402) and
One retransmission unit (403), wherein
The position units (401) pass through a second position for positioning a train in the process of running；
The determination unit (402) sends the weight of data packet when for passing through the second position according to the determining train
Number is passed, determines that the train sends the number of retransmissions of data packet；
The retransmission unit (403) carries out data packet transmission for sending the number of retransmissions of data packet using the train.
9. a kind of train, which is characterized in that the device including the re-transmission data packet as described in any one of claim 5 to 7.
10. a kind of system for retransmitting data packet characterized by comprising retransmit device (501), the second position institute of data packet
The multiple access point AP (502) belonged to and wireless train control system network side unit (503), wherein
The device (501) for retransmitting data packet, for monitoring what the train was reached during a train operation
Position；Predict the train in the radio link quality of a second place；When the train reaches a first position,
Radio link quality according to the train of prediction in the second place determines the train in the second place
Data packet retransmission number, wherein the train first reaches the first position, reaches the second position afterwards；When the column
When vehicle reaches the second position, the train is controlled according to the determining data packet retransmission number, data packet is transferred to institute
Belong to multiple AP (502)；
Multiple AP (502) belonging to the second position, for that will be sent out from the received data packet of the train system unit (501)
Give the wireless train control system network side unit (503)；
The wireless train control system network side unit (503) sends for receiving multiple AP (502) belonging to the second position
Data packet.
11. system as claimed in claim 10, which is characterized in that multiple AP (502) belonging to the second position are also used to
It, will be from the wireless train control system using the data packet retransmission number of the train system unit (501) transmission data packet
Network side unit (503) is sent to the device (501) for retransmitting data packet；
The device (501) for retransmitting data packet is also used to multiple AP (502) received data packets belonging to the second position；
The wireless train control system network side unit (503) is also used to send data packet to more belonging to the second position
A AP (502).
12. system as described in claim 10 or 11, which is characterized in that the device (501) for retransmitting data packet is such as power
Benefit wants the device of 5 to 7 any re-transmission data packets.
13. a kind of device for retransmitting data packet characterized by comprising at least one processor (601), at least one processing
Device (602) and at least one wireless communication port (603), in which:
At least one processor (601), for storing computer program；
At least one described wireless communication port (603), for sending and receiving data；
At least one described processor (602), for calling the computer journey stored in at least one processor (601)
Sequence executes such as Claims 1-4 with the function of sending and receiving data based at least one described wireless communication port (603)
Any one of described in re-transmission data packet method.
14. a kind of machine readable storage medium, is stored thereon with machine readable code；It is characterized in that, the machine readable generation
Code can be executed by a processor and realize the method for retransmitting data packet according to any one of claims 1 to 4.
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