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An improved method of pim‑dm in broadcast multi-hop wireless network

A PIM-DM, wireless interface technology, applied in data exchange networks, digital transmission systems, electrical components, etc., can solve the problem of broadcast multi-hop networks, the industry has not researched the use method, broadcast multi-hop wireless networks have complex physical characteristics, etc. question

Active Publication Date: 2018-01-12
CHONGQING JINMEI COMM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] PIM-DM can adapt to NBMA (Nonbroadcast Multi Access) and Ethernet, but the broadcast multi-hop network industry has not researched the use method
The reason is that the physical characteristics of the broadcast multi-hop wireless network are complex. It has both the characteristics of NBMA (one send and multiple reception) and the characteristics of Ethernet (support broadcast), but also has a new feature that NBMA and Ethernet do not have - one node sends Some nodes need to be relayed and forwarded before they can receive

Method used

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  • An improved method of pim‑dm in broadcast multi-hop wireless network

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Experimental program
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Embodiment Construction

[0019] The specific implementation is described from 5 aspects:

[0020] 1. Neighbor Discovery

[0021] The message format is exactly the same as the standard PIM-DM hello message, and the maintenance time and method are also the same. The only difference is that the neighbor's Layer 2 address (the MAC address used on the wireless network) needs to be maintained.

[0022] 2. Multicast forwarding

[0023] 1) RPF check: RPF check is performed when receiving multicast data packets.

[0024] 2) Form a forwarding table: If the multicast message received from the wireless interface passes the RPF check, a multicast forwarding table is formed at the forwarding level. The RPF interface must be accompanied by the gateway IP address and Layer 2 address, and the outgoing interface must be accompanied by the neighbor's IP address. and Layer 2 addresses, such as figure 1 The forwarding table structure shown.

[0025] 3) Wireless relay forwarding: If the multicast packet received from t...

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Abstract

The invention proposes an improved method for deploying PIM-DM in a narrowband network; by modifying the multicast routing protocol PIM-DM, it can be used on a broadcast multi-hop wireless network. Broadcast multi-hop wireless networks have different physical characteristics from NBMA and Ethernet, so there is no precedent for deploying PIM‑DM on broadcast multi-hop wireless networks. The invention enables the PIM-DM to be applied to the broadcast multi-hop wireless network through the adaptive transformation of the PIM-DM, and provides an application method for the environment that needs to use the multicast service in the broadcast multi-hop wireless network. The beneficial effect of the present invention is that: through these methods, PIM-DM can be utilized in the broadcast multi-hop wireless network.

Description

technical field [0001] The invention relates to an improved method of IP multicast routing protocol PIM-DM in broadcast wireless multi-hop network. Background technique [0002] PIM-DM (Protocol Independent Multicast-Dense Mode) is a multicast routing protocol with a dense topology, which provides multicast routing services for IP networks by using the flooding-pruning mechanism. [0003] PIM-DM can adapt to NBMA (Nonbroadcast Multi Access) and Ethernet, but the broadcast multi-hop network industry has not researched the usage method. The reason is that the physical characteristics of the broadcast multi-hop wireless network are complex. It has both the characteristics of NBMA (one send and multiple reception) and the characteristics of Ethernet (support broadcast), but also has a new feature that NBMA and Ethernet do not have - one node sends Some nodes need to be relayed before receiving. [0004] If the method of using NBMA in the broadcast multi-hop wireless network ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/761H04L45/16
Inventor 瞿辉张唯炯陈量周天翠穆刚
Owner CHONGQING JINMEI COMM