a quality based routing protocol for wireless mesh networks

... [14], cars act as data mules and employ a carry-and-forward paradigm to transfer data packets to a portal Finally, in [15], opportunistic data delivery is studied when both traditional routing and ... delay-tolerant applications A variety of measurements have been made recently available on the Internet [3, 26] in the form of traffic traces or contact patterns When a historical database of contacts ... 8th ACM International Symposium on Mobile Ad Hoc Networking and Computing (MobiHoc ’07), pp 32–40, ACM, September 2007 [6] A Balasubramanian, B Levine, and A Venkataramani, “DTN routing as a resource...

Ngày tải lên: 21/06/2014, 11:20

... packet Therefore, data packets are piggybacked to update buffer state When a sensor x sends out a data packet, it piggybacks its residual-buffer size in the frame header If a neighbor y overhears ... introduce a schedule -based scheme at the transport layer for rate assignment and ordered delivery of event packets to underlying routing layer By using a schedulebased scheme at the transport layer ... the next hop node’s transport buffer Nodes maintain a queue at the transport layer and Faisal B Hussain et al forward a single packet from it during their allocated slots Packet delivery time not...

Ngày tải lên: 21/06/2014, 23:20

... state-free gradient -based forwarding protocol for wireless sensor networks ACM Trans Sen Netw 5(2), 1–25 (2009) A Basu, A Lin, S Ramanathan, Routing Using Potentials: A Dynamic TrafficAware Routing Algorithm, ... phase, sinks flood an ADV packet In receiving an ADV packet, a senor node calculates its gradient using the information specified in the received ADV packet In the data forwarding phase, an address ... the proposed addressing-free forwarding strategy GLOBAL includes an addressing-free data forwarding strategy In GLOBAL, if a node (say node A) updates its gradient after receiving a packet, the...

Ngày tải lên: 21/06/2014, 00:20

... and provide performance comparison with other routing algorithms We also conduct an approximated mathematical analysis for the RAUR to analyze its performance RAUR is a source routing -based algorithm ... header The data packet is treated like any data packet that cannot be forwarded at a node due to an invalid path in its header The node carries out a route discovery operation, as described earlier, ... traffic load, it is scalable as the routing load change is small and gradual even at higher number of sending sources The advantages of RAUR are due to its unicast routing mechanism We have also...

Ngày tải lên: 21/06/2014, 17:20

... Overhead Performance of Adaptive RET 110 Figure 4.15 Delay Performance of Adaptive RET 110 ix A Robust Routing Protocol MANET List of Abbreviations LIST OF ABBREVIATIONS ABR AODV Associativity -Based ... ENGINEERING NATIONAL UNIVERSITY OF SINGAPORE A Robust Routing Protocol for MANET Abstract ABSTRACT In Mobile Ad Hoc Networks (MANETs), routing protocols are challenged with establishing and maintaining ... criteria are considered, MANET protocols can be based on either Link State or Distance Vector Each of these strategies has its Table 2.1 gives a summary on these relative advantage and disadvantages...

Ngày tải lên: 26/09/2015, 09:48

... omni-directional or directional antenna for the backbone of the WMN A directional antenna (also called a sectored antenna) is different from an omni-directional antenna in that it only transmits the signal ... the backbone network In general, the local service antenna has a smaller transmission range, and the backbone service antenna has a larger transmission range, i.e., PL

Ngày tải lên: 20/06/2014, 22:20

... WSNHA-LBAR and LAR maintained a high packet delivery ratio However, the performance for packet average delay of LAR and AODVjr was better than that of WSNHALBAR because automatic self-learning ... performance for packet average delay of LAR and AODVjr was better than that of WSNHALBAR because automatic self-learning in WSNHA-LBAR is exchanged by the decrease of performance for packet average ... performance for packet average delay of LAR and AODVjr was better than that of WSNHA-LBAR because automatic self-learning in WSNHA-LBAR is exchanged by the decrease of performance for packet average...

Ngày tải lên: 21/06/2014, 05:20

... nDL LDATA nDL + L + tST + ACK (12) R TDATA R TDATA LDATA nDL L n +1 + tST + ACK DL , R TDATA R TDATA (13) LDATA R TDATA (15) In B-MAC, all data in a radio range is received As a leaf node has ... neigha a a aa bor discovery protocol for mobile wireless sensor networks, ” Ad Hoc Networks, vol 7, no 1, pp 24–41, 2009 [39] A Sakata, T Yamazato, H Okada, and M Katayama, “Throughput comparison ... (HR) and CC1000 (LR) platforms Channel access is based on superframes that are repeated at regular intervals (access cycle) as shown in Figure A node may act as a cluster head and maintain its...

Ngày tải lên: 21/06/2014, 11:20

... sana1691@yahoo.com SMRI: riazulislam@ieee.org Abstract Applications of wearable and implanted wireless sensor devices are hot research area A specialized field called the body area networks (BAN) ... applications such as BAN Another argument in favor of using out-of-band wakeup radio is that a wakeup radio -based scheme in BAN can save a significant amount of power 2.2 Motivation A BAN needs ... radio can be used to design a power efficient MAC A TDMA -based approach has many advantages over other similar techniques such as CSMA/CA and FDMA Authors of [12] have provided a comparison between...

Ngày tải lên: 21/06/2014, 17:20

... Woodward, “ADistance Routing Effect Algorithm for Mo bility (DREAM),” Proc.MOBICOM Conf 1998, pp 7684, Oct 1998 [2] J Broch, D .A Maltz, D.B Johnson, Y.C Hu, and J Jetcheva, “APerformance Comparison ... Link State Routing) , STAR [4]), giao thức định tuyến nguồn động DSR (Dynamic Source Routing) , giao thức định tuyến vector khoảng cách theo yêu cầu AODV (Ad hoc On- demand Distance Vector routing) ... Comparison of MultiHop Wireless Ad Hoc Network Routing Protocol s,” Proc MOBICOM Conf 1998, pp 85-97, Oct 1998 [3] J.J Garcia-Luna-Aceves and M Spohn, “SourceTree Routing inWireless Networks, ” Proc...

Ngày tải lên: 02/06/2015, 16:33

... to allow for a link quality estimation [5] 4.5 MultiHopLQI One of the first attempts at a link quality estimator for a routing protocol based on the LQI was MultiHopLQI [6], which was actually an ... International Conference on Advanced Information Networking and Applications Workshops/Symposia (AINAW ’07), vol 1, pp 159–164, Niagara Falls, Canada, May 2007 [16] R Draves, J Padhye, and B ... explanation is that their experiments were carried out in very 6.3 Considerations for Routing Ideally, a link quality estimator for a routing protocol should be accurate, agile, and stable, and...

Ngày tải lên: 21/06/2014, 11:20

... packets waiting in the buffer before the routing path establishment The flow -based routing protocol has the delay better than destination -based routing protocol Even if the flow -based routing protocol ... broadcast RREQ packets for each flow, it can discover better routing path than destination -based routing protocol When the data rate increases to Mbits/s, the transmission power fixed at 30 mW has ... F Akyildiz and X Wang, A survey on wireless mesh networks, ” IEEE Communications Magazine, vol 43, no 9, pp 22–30, 2005 [3] A Adya, P Bahl, J Padhye, A Wolman, and L Zhou, A multiradio unification...

Ngày tải lên: 21/06/2014, 23:20

... MANET Based on the original MACA [21] protocol, PAMAS adds one separate channel CHAPTER PROTOCOL DESIGN GUIDELINES AND PRELIMINARY REMARKS 16 for signaling The unique feature of PAMAS is that ... candidate paths, in a priority -based approach depending on the energy resource conditions of all candidate paths This load-balanced routing strategy renders a reliable data delivery performance ... Mobility Management Plane Power Management Plane Transport Layer Network Layer Data Link Layer Task Management Plane Application Layer Physical Layer Figure 2.1: The protocol stack adopted by sensor...

Ngày tải lên: 26/09/2015, 09:47

... platforms 5.2 Simulation results For each algorithm, many cases with different configurations of parameters (e.g., payload, superframe length, macMaxCSMABackoffs, and macMaxFrameRetries) have ... sensor data temporarily in a data buffer and send the sensor data to the coordinator if the data in buffer is more than a certain value (the payload field size of the protocol- defined packet) A sample ... read the sensor data with kHz sample rate and send the data to the coordinator within a short latency At the early stage, some preliminary designs based on the existing hardware platforms and...

Ngày tải lên: 20/06/2014, 22:20

... the advantages of simplicity, small overhead, small latency, etc TRAMA [11] and LMAC [12] are typical schedule -based MAC protocols Compared with contention -based MAC protocol, schedule -based MAC ... Chatterjea, LFW van Hoesel, PJM Havinga, AI-LMAC an adaptive, information-centric and lightweight MAC protocol for wireless sensor networks, in Intelligent Sensors, Sensor Networks and Information ... data size For example, the pressure and temperature sampled data may be smaller in size and lower in sampling rate than the real time image data Finally, unlike most WSN, multiple capsule networks...

Ngày tải lên: 21/06/2014, 01:20

... delay In the first scenario, an attempt was made to compare SAM performance to the basic AODV standard under the same application flow This is achieved by comparing performance of AODV and SAM ... RTT may be impacted by link quality Kaouthar Sethom et al Based on these observations, we propose a QoS-aware routing mesh (SAM) protocol The goal of SAM is to build a wireless mesh network routing ... considers channels with good quality and channel diversity in the same routing protocol THE QOS-AWARE MESH ROUTING PROTOCOL “SAM” Despite the availability of several routing protocols for ad hoc networks, ...

Ngày tải lên: 21/06/2014, 23:20

... total delay due to collision resolution, the total delay associated with actual data transmission, and the delay caused by the collision of a data packet in a data slot The latter term appears when ... the average delay and throughput performance of both CCCDMA and CSMA/CA protocols It is seen that the proposed CC-CDMA exhibit better performance compared to the CSMA/CA protocol A CC-CDMA -Based ... During a CAP, the DEVs access the channel using CSMA/CA to send commands and nonstream asynchronous data Channel access in the CTAP is based on TDMA The CTAP is divided into channel time allocation...

Ngày tải lên: 23/06/2014, 00:20

... present a quantitative analysis of energy savings obtained in EARP QUANTITATIVE ANALYSIS OF EARP AND SIMULATION RESULTS 3.1 Quantitative analysis In this section, a quantitative analysis based on a ... Nagoya, Japan, October 2000 [5] S Gundeti, T Best, R Bhagavathula, and R Pendse, “SARP: an Analytical Evaluation,” submitted for publication [6] W B Heinzelman, A P Chandrakasan, and H Balakrishnan, ... Tech Rep., Berkeley Wireless Research Center, Santa Clara, Calif, USA, 2000 [15] L Bajaj, M Takai, R Ahuja, K Tang, R Bagrodia, and M Gerla, “Glomosim: a scalable network simulation environment,”...

Ngày tải lên: 23/06/2014, 00:20

... study, a cm margin added to the prostate was required to ensure a successful registration An alternative approach is non-rigid image registration for treatment adaptation Chao et al [26] used deformable ... uncertainties from this study indicate that a standard deviation of approximately mm can be achieved in an automatic procedure Data from the CTbased study [23] indicate similar results, based ... 26 Chao M, Xie Y, Xing L: Auto-propagation of contours for adaptive prostate radiation therapy Phys Med Biol 2008, 53:4533-4542 27 Wang H, Garden AS, Zhang L, Wei X, Ahamad A, Kuban DA, Komaki...

Ngày tải lên: 09/08/2014, 09:20

... research for several reasons: Sample size is a frequent limitation Because randomization and analysis usually happens at the organizational rather than individual level, randomized trials of organizational ... clients, and give practical advice about how to implement them The measures of management quality, readiness for organizational change, and the potential for sustainability allow validation of ... experts and programs that have already addressed the same issue However, coaching is expensive, and the match between program and coach may not be ideal Program staff may also miss the camaraderie...

Ngày tải lên: 10/08/2014, 10:23