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Method and device for sending data packets

A sending method and data packet technology, applied in the field of communication, can solve problems affecting system reliability and security, achieve the effect of improving security and stability, and ensuring delivery

Active Publication Date: 2017-07-04
DATANG GOHIGH INTELLIGENT & CONNECTED TECH (CHONGQING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The embodiment of the present invention provides a data packet sending method and device, which are used to solve the problem that in the vehicle-road cooperative communication system existing in the prior art, the data packet cannot be successfully sent out in time within the allowable range of the maximum transmission delay, which affects the system. Reliability and Security Issues

Method used

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  • Method and device for sending data packets
  • Method and device for sending data packets
  • Method and device for sending data packets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] refer to Figure 5 As shown, the time when packet 1 arrives at the MAC layer is time slot 0 of the first frame, and the time when data packet 2 arrives at the MAC layer is time slot 0 of the second frame, and the data buffer queue only contains data packet 1 and data packet 2. refer to Figure 6 As shown, when there is no abnormality in the sending time slots initially selected for data packet 1 and data packet 2, the flow of sending data packets is:

[0068] Step 600: According to the priority information carried by data packet 1, set the delay margin value corresponding to data packet 1, calculate the remaining time for sending data packet 1 according to the maximum transmission delay of data packet 1, and Randomly select an idle time slot from all the time slots corresponding to the remaining time as the sending time slot of data packet 1.

[0069] refer to Figure 5 As shown, after low-priority data packet 1 arrives at time slot 0 of the first frame, according to...

Embodiment 2

[0075] refer to Figure 7 As shown, when the first sending time slot of the above data packet 2 is abnormal, after selecting the second sending time slot of data packet 2 again, the sending of data packet 1 and data packet 2 is successfully completed, and the data buffer queue only contains data packets 1 and packet 2. refer to Figure 8 As shown, the process of sending data packets is:

[0076] Step 800: Update the remaining sending time corresponding to the data packet 2 according to the collision event determination time when the first sending time slot of the data packet 2 is determined to collide, and the delay margin value corresponding to the data packet 2.

[0077] In the embodiment of the present invention, the time slot corresponding to the collision event determination time corresponding to data packet 2 is the second frame time slot 78, and the time delay margin corresponding to the delay margin of data packet 2 is 20ms, then data packet 2 corresponds to The rem...

Embodiment 3

[0083]When there is an abnormality in the second sending time slot of the above-mentioned data packet 2, in all the time slots corresponding to the collision event determination time to the maximum sending delay time corresponding to the data packet 2, there is no When the free time slot can be used as the sending time slot, seize the sending time slot of data packet 1 (time slot 89 of the second frame) as the third sending time slot, successfully complete the sending of data packet 2, and the data cache queue only contains data packet 1 and packet 2. refer to Figure 9 As shown, the process of sending data packets is:

[0084] Step 900: When it is determined that there is no collision in the sending time slot of the data packet 1, the data packet 1 is discarded.

[0085] According to the time slot state vector (table) stored by the node, when the node finds that time slot 95 collides in time slot 85 of the second frame, since data packet 2 is sent from the time correspondin...

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Abstract

The invention discloses a data packet sending method and device, which are used to solve the problem of randomly selecting the sending time slots of data packets in all time slots corresponding to the allowable range of the maximum sending delay of data packets in a vehicle-road cooperative communication system. An abnormality occurs in the sending time slot, so that the data packet cannot be successfully sent out in time within the allowable range of the above-mentioned maximum sending delay, which affects the reliability and security of the system. The method is: based on the SU-ALOHA algorithm, set the corresponding delay margin value according to the data packet transmission priority corresponding to the data packet; according to the delay margin value and the maximum transmission delay information of the data packet carried in the data packet, calculate The remaining time for sending the data packet; sending the above data packet by using the above remaining time for sending.

Description

technical field [0001] The present invention relates to the technical field of communications, in particular to a data packet sending method and device. Background technique [0002] With the development of vehicle-road collaborative communication system and the gradual maturity of mobile ad hoc network technology, in order to realize real-time, dynamic and intelligent management of vehicles, Dedicated Short Range Communications (DSRC) for Internet of Vehicles has been specially developed internationally. )protocol. DSRC organically connects vehicles with vehicles, vehicles and roadside information collection equipment through two-way transmission of information, and supports point-to-point and point-to-multipoint communication. [0003] The Mobile Slotted Aloha (Mobile Slotted Aloha, MS-ALOHA) mechanism is a DSRC MAC layer access and resource allocation mechanism based on time-sharing. Resource allocation is based on the frame structure and uses slots as units. refer to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/927H04L47/80
Inventor 赵丽赵毅房家奕冯媛李凤
Owner DATANG GOHIGH INTELLIGENT & CONNECTED TECH (CHONGQING) CO LTD
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