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Multicast route method and system based on ad hoc on-demand distance vector

A distance vector and routing technology, applied in the field of network-based on-demand distance vector multicast routing methods and systems, can solve problems such as tree structure damage, reduce the number of initiations, ensure the quality of multicast routing, and improve robustness and reliability. sexual effect

Inactive Publication Date: 2011-06-29
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0003] MAODV (Network On-Demand Distance Vector Multicast Routing Protocol, Multicast Ad Hoc On-Demand Multipath Distance Vector), as a tree-based multicast routing protocol, has high packet forwarding efficiency, but since there is only one link between nodes , in the case of strong network mobility, the tree structure is easily damaged

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[0046] The present invention and MAODV are simulated and analyzed by using the network simulation software NS2, and the two are compared from three aspects of the packet delivery rate, the average transmission delay of the packet end-to-end and the control packet overhead.

[0047] Such as image 3 As shown, with the increase of node movement speed, the packet delivery rate of the two algorithms decreases gradually. This is because, as nodes move faster, the network topology changes faster, and the tree structure is more vulnerable to damage. It is necessary to continuously repair links or re-initiate routing requests, resulting in cached packets being lost or undelivered, resulting in a lower packet delivery rate. reduce. exist image 3 Among them, curve 3a is the packet delivery rate of the present invention, and curve 3b is the MAODV packet delivery rate. As can be seen from the figure, the packet delivery rate of the present invention is significantly higher than that o...

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Abstract

The invention discloses a multicast route method and system based on an ad hoc on-demand distance vector. The method comprises: a multicast group leader allocates branch numbers for downstream nodes; based on the branch numbers, multicast group member nodes establish individual main routes and reserved routes; whether the main routes are failed or not is judged, if no, data is transmitted based on the main routes; if yes, the data is transmitted by using the reserved routes under the condition that the reserved routes are not failed; and under the condition that the reserved routes are failed, the routes are repaired and the main and reserved route establishment step is exerted once more. In the invention, a multicast tree structure is maintained by using established reserved branched information, thereby improving the robustness and reliability of a protocol, reducing the initiating times of a route request and lowering the delivery time delay of a multicast data packet so that the multicast route quality of a wireless self-organization network with stronger mobility can be ensured.

Description

technical field [0001] The invention relates to the technical field of wireless ad hoc networks, in particular to a network-based on-demand distance vector multicast routing method and system. Background technique [0002] Wireless ad hoc network is a complex distributed network system, which is widely used in military and civilian fields such as military command and emergency rescue due to its self-organization, no need for fixed infrastructure, node mobility, and good invulnerability. . Multicast, as a point-to-multipoint or multipoint-to-multipoint communication method, has high packet sending and propagation efficiency. Since the application occasions of wireless ad hoc networks often require support for multicast services, it is particularly important to study multicast routing protocols for wireless ad hoc networks. However, the inherent characteristics of wireless ad hoc networks such as distribution, network topology changes, and limited bandwidth make it a great c...

Claims

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Application Information

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IPC IPC(8): H04W40/24
Inventor 李旭苏少明唐艳
Owner BEIJING JIAOTONG UNIV
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