Maintenance method of address compression control table in 6LoWPAN protocol

Abstract

The invention discloses a maintenance method of an address compression control table in a 6LoWPAN protocol. The method comprises the following steps of: generating a control table and an address cache table in a coordinator node; subtracting N1 and N2 from numerical values of weight items corresponding to valid effect items in the address cache table and the control table respectively, and setting the corresponding effect items to be invalid respectively if the numerical values of the weight items in the address cache table and the control table are not greater than threshold values M1 and M2respectively; judging whether the control table has invalid effect items, if so, finding the weight items with maximum numerical values in the valid effect items of the address cache table, and setting the effect items to be invalid; and filling IPV6 address prefixes corresponding to the weight items with maximum numerical values into IPV6 address prefix items corresponding to the invalid effect items in the control table, setting the corresponding effect items in the control table to be valid, and sending message containing the IPV6 address prefixes and corresponding index numbers CID to theadjacent sub node by the coordinator node.

Description

technical field [0001] The invention belongs to the technical field of IPv6-based low-speed wireless personal area network, and in particular relates to a method for maintaining an address compression control table in a 6LoWPAN protocol. Background technique [0002] In order to better understand the background technology of the present invention, you can refer to the following technical materials: [0003] [1] RFC 4944, Transimission of IPv6 Packets over IEEE802.15.4 Networks [0004] [2] draft-ietf-6lowpan-hc-07, Compression Format for IPv6 Datagrams in 6LoWPAN Networks [0005] [3] draft-ietf-6lowpan-nd-09, Neighbor Discovery Optimization for Low-power and Lossy Networks [0006] A Wireless Personal Area Network (WPAN) is a connectionless personal area network. In July 2003, IEEE launched the IEEE802.15.4 technical standard for LR-WPAN. This protocol mainly defines the protocols of the physical layer (PHY) and the media access control layer (MAC). The main applications...

AI Technical Summary

Problems solved by technology

However, the introduction of the CONTEXT table itself requires management overhead, which increases the management data traffic in the entire network.

Especially for the update of CONTEXT entries, every update of CONTEXT needs to ensure that the updated items can be synchronized to the nodes of the entire network, thus causing an objective increase in network traffic

On the other hand, if the update algorithm of the CONTEXT table item is not well designed, it may cause frequent update of table items when the network traffic bursts, thereby increasing the network load.

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