Research And Application On Industrial Wired-wireless Sensor Networks Transparent Transmissiontechnology

Thanks to their peculiar features, wireless networks are currently becoming more and more attractive for use in industrial automation and manufacturing scenarios. However, they cannot be thought of as a total replacement for more traditional wired networks in such environments, at least in the short/mid term. This means that for the time being it is worth focusing on their integration with the existing industrial wired solutions, in order to achieve enhanced flexibility, efficiency,and performance for the overall networked system.IPV6over Low power Wireless Personal Area Network (6LoWPAN) is a simple low-cost communication protocol that allows wireless connectivity in applications with limited power.6LoWPAN adopts the IPv6protocol stack for seamless connectivity between IEEE802.15.4-based networks and the IPv6-based infrastructure.The theoreticalresearch results and innovative points are summarized as follows:1. In this paper we analyze different routing solutions (route over, mesh under and enhanced route over) focusing on how they forward fragments. We evaluate their performance in terms of latency and energy consumption when transmitting IP fragmented packets. All the tests have been performed in a real6LoWPAN implementation. After consideration of the main problems in forwarding of mesh frames in WSN, we propose and analyze a new alternative scheme based on mesh under, which we call controlled mesh under.2. In this paper, we present LoWMob, which isa network-based mobility scheme for mobile6LoWPAN nodes in which the mobility of6LoWPAN nodes is handled at the network-side. LoWMob ensures multi-hopcommunication between gateways and mobile nodes with the help of the static nodeswithin a6LoWPAN. In order to reduce the signaling overhead of static nodes forsupporting mobile nodes, LoWMob proposes a mobility support packet format at theadaptation layer of6LoWPAN. Also we present a distributed version of LoWMob, namedas DLoWMob (or Distributed LoWMob), which employs Mobility Support Points (MSPs)to distribute the traffic concentration at the gateways and to optimize the multi-hop routingpath between source and destination nodes in a6LoWPAN. Moreover, we have alsodiscussed the security considerations for our proposed mobility schemes. The performanceof our proposed schemes is evaluated in terms of mobility signaling costs, end-to-end delay,and packet success ratio.3. In this paper, we focus on a scheme that supports mobility for IPv6over Low power Wireless Personal Area Network(6LoWPAN) sensor nodes. We define a protocol for6LoWPAN mobile sensor node, named6LoMSN, based on Proxy Mobile IPv6(PMIPv6). The conventional PMIPv6standard supports only single-hop networks and cannot be applied to multihop-based6LoWPAN.It does not support the mobility of6LoMSNs and6LoWPAN gateways, named6LoGW, cannot detect the PAN attachment of the6LoMSN. Therefore, we define the movement notification of a6LoMSN in order to support its mobility in multihop-based6LoWPANenvironments. The attachment of6LoMSNs reduces signaling costs over the wireless link by using router solicitation (RS) and routeradvertisement (RA) messages. Performance results show that our proposed scheme can minimize the total signaling costs andhandoff latency. Additionally, we present the design and implementation of the6LoMSN mobility based on PMIPv6for a industrial system. According to the experimental results, the6LoMSN of the proposed PMIPv6-based6LoWPAN can be expected to use more ofthe battery lifetime. We also verify that the6LoMSN can maintain connectivity, even though it has the freedom of being able to movebetween PANs without a mobility protocol stack.