LoWPAN Border Router’s Design And Implementation In 6LoWPAN Network

WSN (Wireless Sensor Network) has many advantages like deployed flexibly, sensor sensitivity, low cost, and has broad application prospects. Due to technical limitations it has not been large-scale application. But with the rapid development of microelectronics, embedded computing technology, network technology in recent years, this situation is gradually changing. For the traditional Independent WSN, integrated with Internet can make it linked with people more closely, this idea was seen as unrealistic only a few years ago. But today the sophisticated IPv6 can provide huge number of IP addressesrequired by WSN, on the other handsome network technology researchaimed at reducing energy and memory consumption and the increasing microprocessor performance make TCP/IP Protocol Stack running on the sensors directly possible.To make each vendor’s product compatible with others, the rapid developing WSN need common international standards urgently. To this end, IEEE developed the IEEE 802.15.4 standard in 2004, which formulated specifications in MAC (Medium Access Control) and PHY (PHYsical)layer.Also in 2004, IETF set up a working group named 6LoWPAN devoted to the research of apply IPv6 on the IEEE802.15.4 network,which hoped to formulate specifications in upper layers. IETF proposed twodrafts, HC (Header Compression)and ND (Neighbor Discover) in September 2011.HC has completed revised and released as RFC6282.This article describes the design and implementation of LBR (Lowpan Border Router) node in 6LoWPAN network.LBR is the bridge of 6LoWPAN network and Internet, and as the core node of 6LoWPAN, LBR charged with the functions of distribution address, forward messages and so on. Our work based on the open source embedded operating system Contiki, implemented the LBR node according to HC and ND standards, and designed places which not mentioned or optional in the drafts. LBR node and HOST nodes combined to form a basic 6LoWPAN network, provides a basic experimental environment and create conditions for further research of 6LoWPAN.