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Method and device of grading multiple access with collision avoidance in space-air-ground vehicle network

A technology of conflict avoidance and access method, which is applied in the field of communication, can solve problems such as increasing channel utilization, and achieve the effects of improving fairness, short back-off time, and guaranteeing service quality

Active Publication Date: 2017-10-24
BEIHANG UNIV
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Problems solved by technology

[0005] The embodiment of the present invention provides a hierarchical multiple access method and device with collision avoidance in the air-to-ground vehicle network, to solve the problem that the utilization rate of the channel needs to be improved in the process of realizing multiple access by using the existing technology

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  • Method and device of grading multiple access with collision avoidance in space-air-ground vehicle network

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Embodiment 4

[0116] This embodiment is carried out on the basis of the third embodiment. In order to further ensure the fast access of high-priority services, after the current reservation is over, the node can, according to the reservation situation in the current reserved time slot on the CCH, such as the sending and receiving of RTS packets and CTS packets, etc., in the next reserved time slot Carry out dynamic time slot adjustment and arrangement, adjust the division ratio of different priority competition areas in the competition micro-slots, so that the size of each competition area can be dynamically adjusted according to the reservation conflict situation of the previous time slot. The specific adjustment method is: the first sending node occupies the N according to each contention area in the first RS CMS and the probability of occurrence of the conflicting information in each of the contention areas, determine the proportion of each of the contention areas in the corresponding RS...

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Abstract

The present invention provides a method and device of grading multiple access with collision avoidance in a space-air-ground vehicle network. The method comprises: a sending node determines a first RS (Reservation Slot) on a first channel; it is determined whether conflict information is received or not in a preset time quantum prior to the first RS, the conflict information comprises: a second CTS (Clear To Send) packet and the conflict RTS packet of a first receiving node, and the second CTS packet is information configured to allow data transmission and sent by receiving node to the first channel corresponding to other sending nodes in the communication range of the sending node; and if the conflict information is received in the preset time quantum prior to the first RS, a backoff time is obtained, the RS sending the first RTS packet to the first receiving node is determined again, and first data is sent to the first receiving node through a second channel. The method and device of grading multiple access with collision avoidance in space-air-ground vehicle network can solve the problem that the channel utilization needs to improve in the process of realization of multiple access in the prior art.

Description

technical field [0001] Embodiments of the present invention relate to the field of communication technology, and in particular to a method and device for hierarchical multiple access with collision avoidance in an air-to-ground vehicle network. Background technique [0002] Multiple access refers to the fast, efficient, fair and reliable sharing of channel resources by multiple nodes or users. Multiple access can effectively improve the utilization of channel resources. [0003] In the process of realizing multiple access in the prior art, reference can be made to figure 1 , figure 1 Including node A, node B, node C and node D, wherein each node judges whether other nodes within its corresponding communication range are sending data through carrier sense technology. When node A sends data to node B, the shaded area with node A as the center is the communication range of node A, and the circular area with node B as the center is the communication range of receiving node B....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/02H04W28/04H04W74/08
CPCH04W28/0268H04W74/085
Inventor 刘凯张涛曹先彬谢晋东肖振宇蔡梦鸽
Owner BEIHANG UNIV
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