Abstract IEEE 802.11 MAC protocol is the de facto standard for wireless local area networks (LANs), and has also been implemented in many network simulation packages multi‐hop ad hoc networks. However, it well known that, as number of active stations increases, performance terms delay throughput degrades dramatically, especially when each station's load approaches its saturation state. To explore inherent problems this protocol, important to characterize probability distribution packet...

Design of efficient medium access control (MAC) protocols with both high throughput performance and high-degree fairness is a major focus in distributed contention-based MAC protocol research. In this paper, we propose novel for wireless local area networks, namely, the fast collision resolution (FCR) algorithm. This algorithm developed based on following innovative ideas: to speed up resolution, actively redistribute backoff timers all active nodes; reduce average number idle slots, use...

Communication security and reliability are two important issues in any network. A typical communication task a wireless sensor network is for every node to sense its local environment, upon request, send data of interest back base station (BS). In this paper, hybrid multipath scheme (H-SPREAD) improve both the potentially hostile unreliable proposed. The new based on distributed N-to-1 discovery protocol, which able find multiple node-disjoint paths from BS simultaneously one route process....

Development of efficient medium access control (MAC) protocols providing both high throughput performance for data traffic and good quality service (QoS) support real-time is the current major focus in distributed contention-based MAC protocol research. In this paper, we propose an contention resolution algorithm wireless local area networks, namely, fast collision (FCR) algorithm. The with new attempts to provide significantly higher services than IEEE 802.11 more advanced dynamic tuning...

Development of efficient transmission power control algorithms providing both high energy efficiency and good link quality is the current major focus in wireless sensor networks research. In paper, we propose an algorithm for networks, namely, on-demand (ODTPC) algorithm. This new attempts to reduce initialization overhead determining optimal level while qualities. Our testbed experiment results show that ODTPC consumes much less than previous (PCBL ( D. Son,et al.) ATPC (S. Lin, et al.))...

This paper studies public-key management, a fundamental problem in providing security support for mobile ad hoc networks. The infrastructureless nature and network dynamics of networks make the conventional certificate-based solutions less suitable. To tackle this problem, we propose novel anonymous certificateless infrastructure (AC-PKI) AC-PKI enables services with public keys thus avoids complicated certificate management inevitable solutions. satisfy demand private during operation,...

Many rate-adaptive MAC protocols have been proposed in the past for wireless local area networks (LANs) to enhance throughput based on channel information. Most of these are receiver and employ RTS/CTS collision avoidance handshake specified IEEE 802.11 standard. However, not considered possibility bursty transmission fragments corresponding rate adaptation schemes. In this article, a protocol with dynamic fragmentation is fragment bursts Instead using one threshold standard, we propose use...

Location-awareness can be applied to the various consumer applications. A received signal strength (RSS) based localization system is relatively inexpensive and simple implemented without additional hardware supports. However, radio signals are strongly affected by obstructed interferences. This a difficult problem for RSS systems in real world. To solve this problem, we propose practical robust algorithm environments. The proposed uses Maximum Likelihood Estimation (MLE) on position...

The topology control technique can prolong the network lifetime, but it suffer significant performance degradation due to interferences of WLAN or Bluetooth devices. This paper proposes a novel algorithm reduce interference effects. basic idea proposed is estimate effects exactly and re-construct robust variations. From experimental results, we see that shows good results in terms delivery ratio energy consumptions.

Development of efficient medium access control (MAC) protocols is a fundamental research issue in high-speed wireless local area networks (LANs). We focus on the throughput efficiency algorithms for LANs which use carrier sense multiple access/collision avoidance (CSMA/CA). propose an distributed contention-based MAC protocol networks, namely, fast collision resolution (FCR) algorithm, and show that proposed FCR algorithm provides high low latency LANs. The performance compared with IEEE...

Many rate-adaptive MAC protocols have been proposed in the past for wireless LANs over time-varying media to provide efficient channel usage and throughput enhancement. Most of these are receiver-based employ RTS/CTS collision avoidance handshakes specified distributed coordination function (DCF) IEEE802.11 MAC. However, do not consider possible bursty transmission fragments a fashion. In this paper, protocol with dynamic fragmentation scheme is order enhance by employing fragment...

This paper proposes a novel 3-dimensional (3D) topology control algorithm to reduce the interference effects by removing links affected interferences. The proposed uses regular polyhedron construct 3D topology. Experimental results show significant performance improvements for both delivery ratio and energy consumption.

Developing an adaptive 3-dimensional (3D) topology control algorithm is important because most wireless nodes are mobile and deployed in buildings. Moreover, buildings, link qualities topologies change frequently due to various objects the interference from other devices. Previous algorithms can suffer significant performance degradation they only use Euclidean distance for construction. In this paper, we propose a novel 3D ad-hoc sensor networks, especially indoor environments. The proposed...

Abstract IEEE 802.15.4a networks can provide the geographic routing solution with high location accuracy for indoor environments. However, in non-line-of-sight (NLOS) environments, may have a large scale error and an unstable communication link. In this article, we propose estimation dynamic link detection scheme NLOS The proposed approach corrects detects procedure. Simulation experimental results show that enhance performance of routing.

The IEEE 802.15.4a standard enables geographical routing in ZigBee networks but previous algorithms can suffer high packet loss due to the interference effects. This letter proposes an interference-aware energy-efficient algorithm for networks. proposed estimates energy cost by considering effects and forwards a neighbor with lowest advance. Experimental results show that outperforms terms of delivery ratio consumption.

Wireless multi-hop ad hoc routing is one of the critical design factors that determine network performance various wireless IoT applications. IETF has standardized point-to-point RPL (P2P-RPL) protocol to overcome inefficient overheads RPL. However, P2P-RPL propagates route discovery forwarding packets throughout whole network. suffers from high energy consumption and huge overhead in low-power lossy networks (LLNs). In this paper, we propose a novel Location-Aware (LA P2P-RPL), which...

Development of efficient medium access control (MAC) protocols is a fundamental research issue in high-speed wireless local area networks (LANs). In this paper, we focus on the performance improvement both MAC layer and transport by using novel protocol LANs which use carrier sense multiple access/collision avoidance(CSMA/CA). We propose an distributed contention-based protocol, namely, Fast Collision Resolution (FCR) algorithm, show that proposed FCR algorithm provides high throughput low...

In this paper, we propose a practical and robust localization algorithm over the obstructed interferences in wireless sensor networks (WSNs). The proposed uses Maximum Likelihood Estimation (MLE) method on position probability grid. addition, detects compensates large RSS measurement errors by using Min-Max environments. Simulation results show that takes advantages of range-based range-free algorithms simultaneously to handle networks.