The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform

Kenichi Mase - One of the best experts on this subject based on the ideXlab platform.

  • RSSI-based Cross Layer Link Quality Management for Layer 3 wireless mesh networks
    2009
    Co-Authors: Kenichi Mase, Hiraku Okada, Yoshiko Nakano
    Abstract:

    We propose a framework of Link quality management for wireless mesh networks. In this method, Packet Error Rate for each rate of each Link is estimated based on RSSI measured for received hello packets using noise parameter to select the optimum rate, such that the Link Metric becomes minimum. We present a method to estimate the noise parameter and show that the proposed method is promising using an actual testbed.

  • a proposal of Link Metric for next hop forwarding methods in vehicular ad hoc networks
    Consumer Communications and Networking Conference, 2009
    Co-Authors: Hiraku Okada, Akira Takano, Kenichi Mase
    Abstract:

    An inter-vehicle communication system, called vehicular ad hoc network (VANET), is one of the most promising applications of a mobile ad hoc network (MANET). One of the important issues in VANET is scalability. Compared with topology-based routing protocols, a routing protocol using position information may alleviate the issues of scalability or control overhead. Car navigation systems using a global positioning system (GPS) are widespread, and position-based routing is a useful approach in VANETs. A next-hop forwarding method is a type of position-based routing protocol, wherein a selection scheme for the next-hop node is very important. In this paper, we propose a novel selection scheme for the next-hop node in the next-hop forwarding method in VANET. In the proposed scheme, a new Link Metric, expected progress distance, is introduced in order to consider both forwarding distance and transmission quality of the wireless Link. We evaluate the performance of our proposed scheme, and show that it can achieve much higher throughput and a better packet delivery ratio than existing conventional schemes.

  • CCNC - A Proposal of Link Metric for Next-Hop Forwarding Methods in Vehicular Ad Hoc Networks
    2009 6th IEEE Consumer Communications and Networking Conference, 2009
    Co-Authors: Hiraku Okada, Akira Takano, Kenichi Mase
    Abstract:

    An inter-vehicle communication system, called vehicular ad hoc network (VANET), is one of the most promising applications of a mobile ad hoc network (MANET). One of the important issues in VANET is scalability. Compared with topology-based routing protocols, a routing protocol using position information may alleviate the issues of scalability or control overhead. Car navigation systems using a global positioning system (GPS) are widespread, and position-based routing is a useful approach in VANETs. A next-hop forwarding method is a type of position-based routing protocol, wherein a selection scheme for the next-hop node is very important. In this paper, we propose a novel selection scheme for the next-hop node in the next-hop forwarding method in VANET. In the proposed scheme, a new Link Metric, expected progress distance, is introduced in order to consider both forwarding distance and transmission quality of the wireless Link. We evaluate the performance of our proposed scheme, and show that it can achieve much higher throughput and a better packet delivery ratio than existing conventional schemes.

Hiraku Okada - One of the best experts on this subject based on the ideXlab platform.

  • RSSI-based Cross Layer Link Quality Management for Layer 3 wireless mesh networks
    2009
    Co-Authors: Kenichi Mase, Hiraku Okada, Yoshiko Nakano
    Abstract:

    We propose a framework of Link quality management for wireless mesh networks. In this method, Packet Error Rate for each rate of each Link is estimated based on RSSI measured for received hello packets using noise parameter to select the optimum rate, such that the Link Metric becomes minimum. We present a method to estimate the noise parameter and show that the proposed method is promising using an actual testbed.

  • a proposal of Link Metric for next hop forwarding methods in vehicular ad hoc networks
    Consumer Communications and Networking Conference, 2009
    Co-Authors: Hiraku Okada, Akira Takano, Kenichi Mase
    Abstract:

    An inter-vehicle communication system, called vehicular ad hoc network (VANET), is one of the most promising applications of a mobile ad hoc network (MANET). One of the important issues in VANET is scalability. Compared with topology-based routing protocols, a routing protocol using position information may alleviate the issues of scalability or control overhead. Car navigation systems using a global positioning system (GPS) are widespread, and position-based routing is a useful approach in VANETs. A next-hop forwarding method is a type of position-based routing protocol, wherein a selection scheme for the next-hop node is very important. In this paper, we propose a novel selection scheme for the next-hop node in the next-hop forwarding method in VANET. In the proposed scheme, a new Link Metric, expected progress distance, is introduced in order to consider both forwarding distance and transmission quality of the wireless Link. We evaluate the performance of our proposed scheme, and show that it can achieve much higher throughput and a better packet delivery ratio than existing conventional schemes.

  • CCNC - A Proposal of Link Metric for Next-Hop Forwarding Methods in Vehicular Ad Hoc Networks
    2009 6th IEEE Consumer Communications and Networking Conference, 2009
    Co-Authors: Hiraku Okada, Akira Takano, Kenichi Mase
    Abstract:

    An inter-vehicle communication system, called vehicular ad hoc network (VANET), is one of the most promising applications of a mobile ad hoc network (MANET). One of the important issues in VANET is scalability. Compared with topology-based routing protocols, a routing protocol using position information may alleviate the issues of scalability or control overhead. Car navigation systems using a global positioning system (GPS) are widespread, and position-based routing is a useful approach in VANETs. A next-hop forwarding method is a type of position-based routing protocol, wherein a selection scheme for the next-hop node is very important. In this paper, we propose a novel selection scheme for the next-hop node in the next-hop forwarding method in VANET. In the proposed scheme, a new Link Metric, expected progress distance, is introduced in order to consider both forwarding distance and transmission quality of the wireless Link. We evaluate the performance of our proposed scheme, and show that it can achieve much higher throughput and a better packet delivery ratio than existing conventional schemes.

Konstantina Papagiannaki - One of the best experts on this subject based on the ideXlab platform.

  • studying wireless routing Link Metric dynamics
    Internet Measurement Conference, 2007
    Co-Authors: Saumitra Mohan Das, Himabindu Pucha, Konstantina Papagiannaki
    Abstract:

    Multi-hop wireless mesh networks are increasingly being deployed for last-mile Internet access. Typically, network algorithms such as routing, channel assignment and topology control for such networks rely heavily on Metrics that intend to capture Link "quality" across the network. However, the underlying dynamics of the proposed Link Metrics themselves have not yet been studied in detail. In this paper, we study the dynamics of the most popular Link Metrics in real network deployments. Using two wireless mesh testbeds, we measure a number of Link Metrics across different hardware platforms and network environments. The collected measurements allow us to study the stability and sensitivity of the different Metrics to various conditions. Our study provides several insights and future research directions on how network algorithms need to adapt to Link dynamics as well as how popular and widely used Link Metrics can be improved.

  • Internet Measurement Comference - Studying wireless routing Link Metric dynamics
    Proceedings of the 7th ACM SIGCOMM conference on Internet measurement - IMC '07, 2007
    Co-Authors: Saumitra Mohan Das, Himabindu Pucha, Konstantina Papagiannaki
    Abstract:

    Multi-hop wireless mesh networks are increasingly being deployed for last-mile Internet access. Typically, network algorithms such as routing, channel assignment and topology control for such networks rely heavily on Metrics that intend to capture Link "quality" across the network. However, the underlying dynamics of the proposed Link Metrics themselves have not yet been studied in detail. In this paper, we study the dynamics of the most popular Link Metrics in real network deployments. Using two wireless mesh testbeds, we measure a number of Link Metrics across different hardware platforms and network environments. The collected measurements allow us to study the stability and sensitivity of the different Metrics to various conditions. Our study provides several insights and future research directions on how network algorithms need to adapt to Link dynamics as well as how popular and widely used Link Metrics can be improved.

Nadeem Javaid - One of the best experts on this subject based on the ideXlab platform.

  • bietx a new quality Link Metric for static wireless multi hop networks
    International Conference on Wireless Communications and Mobile Computing, 2016
    Co-Authors: Nadeem Javaid, Ashfaq Ahmad, Muhammad Imran, Ahmad A Alhamed, Mohsen Guizani
    Abstract:

    In this work, we propose a novel quality Link Metric; Bandwidth adjusted Inverse ETX (BIETX) for Static Wireless Multi-hop Networks (SWMhNs). The proposed Metric considers two path selection parameters into account i.e., packet delivery ratio and Link capacity. For computing packet delivery ratios in BIETX, the mechanism of Expected Transmission Count (ETX) is adopted. On the other hand, we take two methods of computing Link capacity in BIETX. These methods are based upon the size of pair probes; equal size and different size. We also enhance Optimized Link State Routing (OLSR) protocol while using BIETX. A comparative analysis of proposed Metric with equal size and different size pair probe; BIETX-1 and BIETX-2, with two existing quality Metrics (ETX and Expected Transmission Time (ETT)) in SWMhNs is also a part of this work. From simulation results, we conclude that BIETX-2 outperforms rest of the Metrics because of low routing load in ad-hoc probes, and low routing latencies due to enhancements of routing update frequencies and window size in OLSR.

  • IWCMC - BIETX: A new quality Link Metric for Static Wireless Multi-hop Networks
    2016 International Wireless Communications and Mobile Computing Conference (IWCMC), 2016
    Co-Authors: Nadeem Javaid, Ashfaq Ahmad, Muhammad Imran, Ahmad A Alhamed, Mohsen Guizani
    Abstract:

    In this work, we propose a novel quality Link Metric; Bandwidth adjusted Inverse ETX (BIETX) for Static Wireless Multi-hop Networks (SWMhNs). The proposed Metric considers two path selection parameters into account i.e., packet delivery ratio and Link capacity. For computing packet delivery ratios in BIETX, the mechanism of Expected Transmission Count (ETX) is adopted. On the other hand, we take two methods of computing Link capacity in BIETX. These methods are based upon the size of pair probes; equal size and different size. We also enhance Optimized Link State Routing (OLSR) protocol while using BIETX. A comparative analysis of proposed Metric with equal size and different size pair probe; BIETX-1 and BIETX-2, with two existing quality Metrics (ETX and Expected Transmission Time (ETT)) in SWMhNs is also a part of this work. From simulation results, we conclude that BIETX-2 outperforms rest of the Metrics because of low routing load in ad-hoc probes, and low routing latencies due to enhancements of routing update frequencies and window size in OLSR.

  • Investigating Quality Routing Link Metrics in Wireless Multi-hop Networks
    arXiv: Networking and Internet Architecture, 2013
    Co-Authors: Nadeem Javaid, A. Bibi, A. Javaid, Z. A. Khan, K. Latif, M. Ishfaq
    Abstract:

    In this paper, we propose a new Quality Link Metric (QLM), ``Inverse Expected Transmission Count (InvETX)'' in Optimized Link State Routing (OLSR) protocol. Then we compare performance of three existing QLMs which are based on loss probability measurements; Expected Transmission Count (ETX), Minimum Delay (MD), Minimum Loss (ML) in Static Wireless Multi-hop Networks (SWMhNs). A novel contribution of this paper is enhancement in conventional OLSR to achieve high efficiency in terms of optimized routing load and routing latency. For this purpose, first we present a mathematical framework, and then to validate this frame work, we select three performance parameters to simulate default and enhanced versions of OLSR. Three chosen performance parameters are; throughput, Normalized Routing Load and End-to-End Delay. From simulation results, we conclude that adjusting the frequencies of topological information exchange results in high efficiency.

  • GLOBECOM - Identifying Design Requirements for Wireless Routing Link Metrics
    2011 IEEE Global Telecommunications Conference - GLOBECOM 2011, 2011
    Co-Authors: Nadeem Javaid, M. N. Ullah, Karim Djouani
    Abstract:

    In this paper, we identify and analyze the requirements to design a new routing Link Metric for wireless multihop networks. Considering these requirements, when a Link Metric is proposed, then both the design and implementation of the Link Metric with a routing protocol become easy. Secondly, the underlying network issues can easily be tackled. Thirdly, an appreciable performance of the network is guaranteed. Along with the existing implementation of three Link Metrics Expected Transmission Count (ETX), Minimum Delay (MD), and Minimum Loss (ML), we implement inverse ETX; invETX with Optimized Link State Routing (OLSR) using NS-2.34. The simulation results show that how the computational burden of a Metric degrades the performance of the respective protocol and how a Metric

  • Analysis and design of quality Link Metrics for routing protocols in Wireless Networks
    2010
    Co-Authors: Nadeem Javaid
    Abstract:

    This dissertation endeavors to contribute enhancements in goodputsof the IEEE 802.11-based Wireless Multi-hop Networks (WMhNs).By performing exhaustive simulations, for the deep analysis and detailed assessment of both reactive (AODV, DSR, DYMO) and proactive (DSDV, FSR, OLSR) protocols for varying mobilities, speeds, network loads and scalabilities, it is observed that a routing Link Metric is a significant component of a routing protocol. In addition to finding all available paths, the fastest end-to-end route is selected by a Link Metric for the routing protocol. This study aims the quality routing. In the class of quality Link Metrics, Expected Transmission Count (ETX) is extensively used. Thus, the most recently proposed ETX-based Metrics have been analyzed. Though, newly developed Metrics over perform ETX but still they can be improved. By profound analysis and particularized comparison of routing protocols depending upon their classes (reactive and proactive) and ETX-based Metrics, we come to realize that users always demand proficient networks. In fact, WMhNs are facing several troubles which they expect to be resolved by the routing protocol operating them. Consequently, the protocol depends upon the Link Metric for providing quality paths. So, we identify and analyze the requirements to design a new routing Link Metric for WMhNs. Because, considering these requirements, when a Link Metric is proposed, then : firstly, both the design and implementation of the Link Metric with a routing protocol become easy. Secondly, the underlying network issues can easily be tackled. Thirdly, an appreciable performance of the network is guaranteed. Keeping in view the issues of WMhNs, increasing demands of users and capabilities of routing protocols, we propose and implement a new quality Link Metric, Interference and Bandwidth Adjusted ETX (IBETX). As, MAC layer affects the Link performance and consequently the route quality, the Metric therefore, tackles the issue by achieving twofold MAC-awareness. Firstly, interference is calculated using cross-layered approach by sending probes to MAC layer. Secondly, the nominal bit rate information is provided to all nodes in the same contention domain by considering the bandwidth sharing mechanism of 802.11. Like ETX, our Metric also calculates Link delivery ratios that directly affect throughput and selects those routes that bypass dense regions in the network. Simulation results by NS-2 show that IBETX gives 19% higher through put than ETX and 10% higher than Expected Throughput (ETP). Our Metric also succeeds to reduce average end-to-end delay up to 16% less than Expected Link Performance (ELP) and 24% less than ETX

Saumitra Mohan Das - One of the best experts on this subject based on the ideXlab platform.

  • studying wireless routing Link Metric dynamics
    Internet Measurement Conference, 2007
    Co-Authors: Saumitra Mohan Das, Himabindu Pucha, Konstantina Papagiannaki
    Abstract:

    Multi-hop wireless mesh networks are increasingly being deployed for last-mile Internet access. Typically, network algorithms such as routing, channel assignment and topology control for such networks rely heavily on Metrics that intend to capture Link "quality" across the network. However, the underlying dynamics of the proposed Link Metrics themselves have not yet been studied in detail. In this paper, we study the dynamics of the most popular Link Metrics in real network deployments. Using two wireless mesh testbeds, we measure a number of Link Metrics across different hardware platforms and network environments. The collected measurements allow us to study the stability and sensitivity of the different Metrics to various conditions. Our study provides several insights and future research directions on how network algorithms need to adapt to Link dynamics as well as how popular and widely used Link Metrics can be improved.

  • Internet Measurement Comference - Studying wireless routing Link Metric dynamics
    Proceedings of the 7th ACM SIGCOMM conference on Internet measurement - IMC '07, 2007
    Co-Authors: Saumitra Mohan Das, Himabindu Pucha, Konstantina Papagiannaki
    Abstract:

    Multi-hop wireless mesh networks are increasingly being deployed for last-mile Internet access. Typically, network algorithms such as routing, channel assignment and topology control for such networks rely heavily on Metrics that intend to capture Link "quality" across the network. However, the underlying dynamics of the proposed Link Metrics themselves have not yet been studied in detail. In this paper, we study the dynamics of the most popular Link Metrics in real network deployments. Using two wireless mesh testbeds, we measure a number of Link Metrics across different hardware platforms and network environments. The collected measurements allow us to study the stability and sensitivity of the different Metrics to various conditions. Our study provides several insights and future research directions on how network algorithms need to adapt to Link dynamics as well as how popular and widely used Link Metrics can be improved.