1 Introduction
Wireless Sensor Network (WSN) is an integrated intelligent information system integrating information collection, information processing and information transmission. It has broad application prospects and can be applied to security, ecological environment, intelligent transportation, smart home and home. Medical care and other fields. Wireless sensor networks are often accompanied by a large number of sensor devices. If various devices are connected to the Internet, a large number of IP addresses are required. Currently, IP v4 cannot meet its needs, and IPv6 has abundant address resources, so it can be very good. To meet its needs, in addition to IPv6, IPv6 has the following advantages:
1.1 High security
The IP v6 protocol suite defines basic information about security, such as Datagram Encapsulation Security Protocol (ESP) and Transmit Datagram Authentication (Authentication Header AH).
For all IPv6 nodes, IPsec is enforced. An end-to-end connection of IP v6 is secure. The encryption protection of the authentication peer data of the communication peer enables sensitive data to be transmitted securely over the IPv6 network. And the world's only address clearly identifies each node and avoids end-to-end security breaches by NAT (Network Address Translation).
1.2 Strong mobility
A care-of address can be obtained anywhere through address autoconfiguration and used to communicate with nodes on the network. With mobile IPv6 and home agents, mobile terminals can roam between different networks while maintaining existing communication connections without interruption, while maintaining their reachability.
1.3 Good service quality
There is a traffic class in the IP v6 header, which can be used to prioritize key users and applications. The flow label in the IPv6 header is Traffic Engineering and load balancing. And the distinction between end-to-end data streams provides a powerful tool; globally unique addresses can differentiate data streams in more detail, while structured addresses can easily aggregate data streams on edge networks.
Therefore, IP V6 can well meet the functional requirements of wireless sensor networks and the Internet for seamless connection.
2 Key technology research
The wireless sensor network is a multi-hop mobility peer-to-peer network using wireless communication methods consisting of a large number of sensor nodes with wireless communication and computing power, low power consumption and low complexity. If the IP V6 technology is fully applied to the wireless sensor network, it will consume most of the energy of the sensor, and some of its functions cannot be realized. Therefore, existing IPV6 technology cannot be applied to wireless sensor networks. In order to apply IP V6 technology to wireless sensor networks, this paper designs IPV6 header compression method based on 6L o W PA N, so that IPV6 can effectively serve wireless sensor networks. The IEEE working group designed the IPv6 header compression method as shown in Figure 1.
Figure 1 LOWPAN_HC1
In this design, the source and destination addresses of IPV6 occupy a large portion of the packet space. If you can optimize the compression of its address space, it will greatly improve the performance of the data packet. The IP address of the IP V6 packet mainly includes the address prefix and interface identifier. If it is transmitted inside the wireless sensor network, the prefix can be fully compressed, and the interface identifier can be identified through the data link layer. On this basis, the source address and the destination address can be effectively compressed into 2 bits. The specific design format is shown in Figure 2:
Figure 2 LOWPAN_HC1 encoding format
The specific encoding format is as follows:
SA: IPV6 source address
DA: IPV6 destination address
T&F: transport type and data flow label
NH: next head
HC2: HC2 code
NCF: uncompressed area
3 Simulation experiment
In order to verify the effectiveness of the method designed in this paper, the design method was simulated on the N S2 simulation. The experiment consists of 21 nodes, which simulates experiments in a 50*50 square meter space, including 1 demodulator and 5 common coordinators. The simulated reference layer data information is 50 bytes in length. The main experimental contents include information transmission success rate and end-to-end delay test. The specific test results are shown in Tables 1 and 2.
Table 1 Comparison of packet transmission success rates
Table 2 End-to-end delay comparison
4 Summary
Based on the research of wireless sensor network, IP V6 and 6LoWPAN, this paper optimizes the compression of the packet header of IPV6 data packet, so that IPV6 can be better applied to the wireless sensor network, so that the wireless sensor network can be very Good integration with the Internet.
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