Performance of IEEE 802.11a in Vehicular Contexts

Cottingham, David N.; Wassell, I.J.; Harle, Robert

doi:10.1109/vetecs.2007.185

Cited by 41 publications

(20 citation statements)

References 9 publications

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“…The general simulation parameters are as follows: each vehicle generates constant bit rate traffic using UDP datagrams (we chose UDP and not TCP for the same reasons stated in Cottingham et al (2007)). 512-byte datagrams were transmitted at a rate of four packets per second.…”

Section: Simulation Environmentsmentioning

confidence: 99%

“…This classification clarifies that, although safety applications have attracted special interest and require more scrutiny, other types of applications need to be attended as well. Also, as shown by authors such as Cottingham et al (2007), Jansons and Barancevs (2012) and Wellens et al (2007), vehicular ad hoc networks (VANETs) introduce complex dynamics that have not emerged in other types of MANETs. Due to this lack of solutions for non-safety applications, this paper targets unicast communications, which is required by non-safety applications in vehicular scenarios.…”

Section: Introductionmentioning

confidence: 99%

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A density-based contention window control scheme for unicast communications in vehicular ad hoc networks

Balador

Calafate

Cano

et al. 2017

IJAHUC

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Achieving a well-designed medium access control (MAC) protocol is a challenging issue to improve communications efficiency due to the dynamic nature of vehicular ad hoc networks (VANETs). IEEE 802.11p standard was selected as the best choice for vehicular environments considering its availability, maturity, and cost. The common problem in all IEEE 802.11 based protocols is scalability, exhibiting performance degradation in highly variable network scenarios. Experimental results for the IEEE 802.11-based MAC protocol show the importance of contention window adjustment on communications performance; However the vehicular communications community has not yet addressed this issue in unicast communication environments. This paper proposes a novel contention window control scheme for VANET environments based on estimating the network density, which is then used to dynamically adapt the CW size. Analysis and simulation results show that our proposal provides better overall performance compared with previous proposals, even in high network density scenarios.

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Section: Simulation Environmentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A density-based contention window control scheme for unicast communications in vehicular ad hoc networks

Balador

Calafate

Cano

et al. 2017

IJAHUC

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“…The first is knowledgebased and attempts to know, by measuring beforehand, the signal strengths of available wireless networks over a given area such as a city. This could involve physically driving around and taking these readings [10]. These measurements need to be taken in different seasonal contexts as the effects of foliage on wireless propagation are well known [11].…”

Section: Advancedmentioning

confidence: 99%

Exploiting Location and Contextual Information to Develop a Comprehensive Framework for Proactive Handover in Heterogeneous Environments

Mapp

Katsriku

Aiash

et al. 2012

Journal of Computer Networks and Communications

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The development and deployment of several wireless and cellular networks mean that users will demand to be always connected as they move around. Mobile nodes will therefore have several interfaces and connections will be seamlessly switched among available networks using vertical handover techniques. Proactive handover mechanisms can be combined with the deployment of a number of location-based systems that provide location information to a very high degree of accuracy in different contexts. Furthermore, this new environment will also allow contextual information such as user profiles as well as the availability of using location and contextual information to provide efficient handover mechanisms. Using location-based techniques, it is possible to demonstrate that the Time Before Vertical Handover as well as the Network Dwell Time can be accurately estimated. These techniques are dependent on accurately estimating the handover radius. This paper investigates how location and context awareness can be used to estimate the best handover radius. The paper also explores how such techniques may be integrated into the Y-Comm architecture which is being used to explore the development of future mobile networks. Finally, the paper highlights the use of ontological techniques as a mechanism for specifying and prototyping such systems.

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“…However, due to limits on the latency (or the number of retransmission attempts) at the link layer, the residual (post-ARQ) loss rates can be high as well, particularly in scenarios involving mobility. For example, for communication among fast-moving ground vehicles, it has been observed that post-ARQ loss rates can be high (20% or more) and also have high variance [2], [3]. Such high packet loss rates have serious implications on performance of TCP when used over wireless networks.…”

Section: Introductionmentioning

confidence: 99%

A Transport Protocol to Exploit Multipath Diversity in Wireless Networks

Sharma

Kar

Ramakrishnan

et al. 2012

IEEE/ACM Trans. Networking

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Abstract-Wireless networks (including wireless mesh networks) provide opportunities for using multiple paths. Multihoming of hosts, possibly using different technologies and providers, also makes it attractive for end-to-end transport connections to exploit multiple paths. In this paper, we propose a multi-path transport protocol, based on a carefully crafted set of enhancements to TCP, that effectively utilizes the available bandwidth and diversity provided by heterogeneous, lossy wireless paths. Our Multi-Path LOss-Tolerant (MPLOT) transport protocol can be used to obtain significant goodput gains in wireless networks, subject to bursty, correlated losses with average loss-rates as high as 50%. MPLOT is built around the principle of separability of reliability and congestion control functions in an end-to-end transport protocol. Congestion control is performed separately on individual paths and the reliability mechanism works over the aggregate set of paths available for an end-to-end session.MPLOT distinguishes between congestion and link losses through Explicit Congestion Notification (ECN), and uses Forward Error Correction (FEC) coding to recover from data losses. MPLOT uses a dynamic packet mapping based on the current path characteristics to choose a path for a packet. Use of erasure codes and block level recovery ensures that in MPLOT, the receiving transport entity can recover all data as long as a necessary number of packets in the block are received, irrespective of which packets are lost. We present a theoretical analysis of the different design choices of MPLOT, and show that MPLOT chooses its policies and parameters such that a desirable tradeoff between goodput with data recovery delay is attained. We evaluate MPLOT, through simulations, under a variety of test scenarios and demonstrate that it effectively exploits path diversity in addition to efficiently aggregating path bandwidths, while remaining fair to a conventional TCP flow on each path.

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Performance of IEEE 802.11a in Vehicular Contexts

Cited by 41 publications

References 9 publications

A density-based contention window control scheme for unicast communications in vehicular ad hoc networks

A density-based contention window control scheme for unicast communications in vehicular ad hoc networks

Exploiting Location and Contextual Information to Develop a Comprehensive Framework for Proactive Handover in Heterogeneous Environments

A Transport Protocol to Exploit Multipath Diversity in Wireless Networks

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