Recent advances in wireless technologies, micro-electro-mechanical systems, and embedded systems enable the popular usage of Internet Things (IoT) sensor networks (WSNs) many important applications, such as smart buildings, security, target tracking, industrial automation, so on. Typically, a WSN consists large number tiny, low-cost nodes that are limited terms their capabilities computation, communication, memory, power. In WSNs, energy-efficient algorithms paramount importance for long...

Routing plays an important role in the overall architecture of Internet Things. IETF has standardized RPL routing protocol to provide interoperability for low-power and lossy networks (LLNs). LLNs cover a wide scope applications, such as building automation, industrial control, healthcare, so on. applications require reliable energy-efficient support. Point-to-point (P2P) communication is fundamental requirement many applications. However, traditional protocols usually propagate throughout...

The radio link between a pair of wireless nodes is determined by channels, transmission range, node mobility and node-pair distance, which form set random factors in multihop networks. properties such links can be characterized lifetime, residual lifetime change rate, which, fact, have been widely used for network design performance evaluation. In this paper, we take new modeling approach that captures the dynamics channels movements small-scale. More specifically, distance transition...

Power conservation and reliable data delivery are two most critical issues in the design of routing protocols for wireless networks, especially dense lossy networks. However, traditional protocols, which deliver packets along predetermined paths with unnecessarily high transmit power, cannot cope well dynamic mediums under excessive interference. In order to prolong lifetime networks improve reliability this letter proposes a energy-efficient opportunistic (REOR) protocol. REOR effectively...

Existing random mobility models have their limitations such as speed decay and sharp turn which been demonstrated by the previous studies. More importantly, need to mimic movements that abide physical law for accurate analysis simulations of mobile networks. Therefore, in this paper, we propose a novel model, semi-Markov smooth (SMS) model. Each SMS movement includes three consecutive phases: up phase, middle slow down phase. Thus, entire motion model is consistent with moving behaviors real...

Understanding the impacts of node mobility on topology dynamics is essential to design a resilient ad hoc network. Current research showed that models can heavily affect study network due different patterns (Santi, 2005). In this paper, based smooth model (Zhao and Wang, 2006) was analyzed, because it generates smooth, microscopic nodal movements, has no speed decay problem, maintains uniform spatial distribution. Specifically, two metrics: expected link lifetime change rate were studied by...

We study link properties over dynamic radio channels based on analytical models and simulations. Specifically, channel variability mobility are investigated through two quantities: effective transmission range node-pair distance, respectively. find that the PDF of lifetime can be approximated by exponential distribution with parameter characterized ratio average node speed to range. Moreover, we show for slower mobile nodes is mainly determined characteristics, whereas faster nodes, it...

Low Power and Lossy Networks (LLNs), as it covers a wide scope of applications, such building automation, industrial control, healthcare etc., has received considerable attention in recent years. In many LLNs Point-to-point (P2P) communication is crucial, which extremely need to be supported by reliable energy- efficient routing protocols. However, traditional protocols usually propagate the whole network discover P2P route, causing huge energy consumption. Moreover, critical but difficult...

Low-Power and Lossy networks (LLNs) cover a wide scope of applications, including, but not limit to, industrial control, healthcare building automation, which has proliferated into both academic areas in recent years. Routing plays significant role to the overall architecture LLNs. The IPv6 Protocol for Low Power Networks (RPL) is standardized by IETF provide interoperability Traditional routing protocols deliver packets through single relay cannot cope well with unreliable wireless medium....

Existing mobility models used in the simulation tools have two major limitations. First, these invoke unrealistic moving behaviors, such as sudden stop and sharp turn during simulation. Hence, study of mobile ad-hoc networks (MANETs) based on could lead to wrong conclusions. Second, because node speed direction do not change within each movement, they are insufficient mimic minute behaviors users. Therefore, we design a novel smooth model, which can characterize real-life users accordance...

In geometric ad hoc networks, mobile nodes' locations facilitate greedy routing algorithms to discover the optimal or shortest paths. When void zones (holes) present, could fail due local minimum problem. To solve this problem, existing geographic use face strategies based on planarization of underlying network topology. We notice that during process, some single-hop links are removed from network, which implies packets have be delivered around faces even if a link is available. we present...

With the expansion of application range and network scale wireless sensor networks in recent years, WSNs often generate data surges delay queues during transmission process, causing paralysis, even resulting local or global congestion. In this paper, a dynamically Adjusted Duty Cycle for Optimized Congestion based on real-time Queue Length (ADCOC) scheme is proposed. order to improve resource utilization rate nodes, we carried out optimization analysis theory applied it adjustment node's...

Understanding link statistics in mobile ad hoc networks (MANETs) is essential to design adaptive routing protocols and achieve desired network performance. While much attention has been given the node mobility impacts, little done investigate influence of dynamic channel fadings joint effects interactions among radio channels, transmission range, node-pair distance on statistics. In this paper, we stability availability by using a transition probability matrix relative between two nodes. Our...

In recent years, due to the development and pervasiveness of information communication technology (ICT), data is generated at a tremendously increasing rate from various types sources. This massive amount widely referred as Big Data, which contains large hidden rich information. By uncovering valuable information, Data services are envisioned bring huge potential for commerce, business research. fact, series sophisticated processes involved in services. However, there exists structural gap,...

Network coding has been introduced as a new paradigm for network routing protocols in recent years. The wide range of advantages coding, such energy saving, throughput improvement and congestion mitigation, have demonstrated many practical systems. However, the nature packet mixing, optimization forwarding nodes selection cause based vulnerable to attacks. In this paper, we conduct detailed analysis various security threats that attack on different components intra-flow schemes, provide an...

Grid data management is a challenging task because of the heterogeneous, dynamic and largescale nature environments. This paper proposes an autonomic architecture based on virtualized distributed file systems WSRF-compliant services. Autonomic functions are integrated into services to provide self-managing control over different entities Grid-wide system sessions in accordance with high-level objectives operate together automatically achieve desired provisioning behaviors. Important features...

There are some selfish nodes in wireless mesh networks multi-path inter-session network coding; and all maximize their earnings through the game. In this paper, a stimulus scheme is proposed which suit for game coding transmission, we use watch dog checks existence of nodes. After detected, modified protocols. For nodes, adopt non-cooperation method to punish it; that priority forwarding used active cooperation It proved Nash equilibrium acquired players obey incentive honestly. Experiments...