EAI Endorsed Transactions on Mobile Communications and Applications

Issue 2, 2012

Editor(s)-in-Chief: Jun Zheng

Articles
Information

A Sensing Error Aware MAC Protocol for Cognitive Radio Networks
Appears in:
mca 12(2): e1

Authors:
Donglin Hu, Shiwen Mao

Abstract:
Cognitive radios (CR) are intelligent radio devices that can sense the radio environment and adapt to changes in the radio environment. Spectrum sensing and spectrum access are the two key CR functions. In this paper, we present a spectrum sensing error aware MAC protocol for a CR network colloca…Cognitive radios (CR) are intelligent radio devices that can sense the radio environment and adapt to changes
in the radio environment. Spectrum sensing and spectrum access are the two key CR functions. In this
paper, we present a spectrum sensing error aware MAC protocol for a CR network collocated with multiple
primary networks. We explicitly consider both types of sensing errors in the CR MAC design, since such
errors are inevitable for practical spectrum sensors and more importantly, such errors could have significant
impact on the performance of the CR MAC protocol. Two spectrum sensing polices are presented, with which
secondary users collaboratively sense the licensed channels. The sensing policies are then incorporated into
p-Persistent CSMA to coordinate opportunistic spectrum access for CR network users.We present an analysis
of the interference and throughput performance of the proposed CR MAC, and find the analysis highly
accurate in our simulation studies. The proposed sensing error aware CR MAC protocol outperforms two
existing approaches with considerable margins in our simulations, which justify the importance of considering
spectrum sensing errors in CR MAC design.
more »
Logical Link Control and Channel Scheduling for Multichannel Underwater Sensor Networks
Appears in:
mca 12(2): e2

Authors:
Jun Li, Mylène Toulgoat, Yifeng Zhou, Louise Lamont

Abstract:
With recent developments in terrestrial wireless networks and advances in acoustic communications, multichannel technologies have been proposed to be used in underwater networks to increase data transmission rate over bandwidth-limited underwater channels. Due to high bit error rates in underwate…With recent developments in terrestrial wireless networks and advances in acoustic communications,
multichannel technologies have been proposed to be used in underwater networks to increase data
transmission rate over bandwidth-limited underwater channels. Due to high bit error rates in underwater
networks, an efficient error control technique is critical in the logical link control (LLC) sublayer to establish
reliable data communications over intrinsically unreliable underwater channels. In this paper, we propose
a novel protocol stack architecture featuring cross-layer design of LLC sublayer and more efficient packetto-
channel scheduling for multichannel underwater sensor networks. In the proposed stack architecture, a
selective-repeat automatic repeat request (SR-ARQ) based error control protocol is combined with a dynamic
channel scheduling policy at the LLC sublayer. The dynamic channel scheduling policy uses the channel state
information provided via cross-layer design. It is demonstrated that the proposed protocol stack architecture
leads to more efficient transmission of multiple packets over parallel channels. Simulation studies are
conducted to evaluate the packet delay performance of the proposed cross-layer protocol stack architecture
with two different scheduling policies: the proposed dynamic channel scheduling and a static channel
scheduling. Simulation results show that the dynamic channel scheduling used in the cross-layer protocol
stack outperforms the static channel scheduling. It is observed that, when the dynamic channel scheduling
is used, the number of parallel channels has only an insignificant impact on the average packet delay. This
confirms that underwater sensor networks will benefit from the use of multichannel communications.
more »
LOTIR: A Routing Protocol for Multi-hop V-to-I Communication Using Local Traffic Information
Appears in:
mca 12(2): e3

Authors:
Kun-chan Lan, Chien-Ming Chou, Che-Chun Wu, Mei-Wen Li

Abstract:
Vehicular Ad Hoc Network (VANET) is an emerging technology that can be applied to safety, transport efficiency, or infotainment applications for roads and highways. However, due to its unique features, such as dynamic mobility patterns and uneven distributions of vehicles, VANET faces many challe…Vehicular Ad Hoc Network (VANET) is an emerging technology that can be applied to safety, transport efficiency, or
infotainment applications for roads and highways. However, due to its unique features, such as dynamic mobility
patterns and uneven distributions of vehicles, VANET faces many challenging research issues for robust data
dissemination in the network. Many routing protocols have been proposed for VANET in the past few years, and the
idea of utilizing a navigation system to assist the routing protocol for selecting the next best forwarder has become
increasingly popular. However, it might not be realistic to assume that every vehicle is equipped with a navigation
system. In addition, due to privacy concerns, drivers might not want to reveal their planned routes to other cars. In this
work, we propose a new routing protocol, called LOTIR (LOcal Traffic Information Routing), that relies on only local
traffic information and does not require the assistance of a navigation system. LOTIR is a DTN-based routing protocol
that utilizes the car-following theory and traffic light information to decide the next carrier to forward the data to. We
implement LOTIR in NS-2, and our results show that it can achieve similar performance as prior work which depends
on the availability of global network topology information.
more »
Cross–layer cross–domain adaptation of mobile video services
Appears in:
mca 12(2): e4

Authors:
Jose Oscar Fajardo, Ianire Taboada, Fidel Liberal

Abstract:
This paper deals with the analysis of user perceived visual quality for mobilemultimedia services. H.264/AVC is selected for low resolution video encoding, and a mobile UMTS network is considered for the access to services. First, from subjective tests results, the combined impact of different serv…This paper deals with the analysis of user perceived visual quality for mobilemultimedia services. H.264/AVC is selected for low resolution video encoding, and a mobile UMTS network is considered for the access to services. First, from subjective tests results, the combined impact of different service– and radio network–level parameters is inferred. As a result, different cross–layer adaptation alternatives are proposed to maximize the
perceived quality level under different service conditions. Afterwards, the backhaul segment is considered taking into account possible congestion effects after the aggregation ofmulti–user media stream. The proposed dynamic adaptation process determines the best combination of media bitrates in order to optimise the overall quality, by making use of information related to network performance both at the radio and backhaul segments.
more »
A Trace-Driven Analysis of Wireless Group Communication Mechanisms
Appears in:
mca 12(2): e5

Authors:
Surendar Chandra, Xuwen Yu

Abstract:
Wireless access is increasingly ubiquitous while mobile devices that use them are resource rich. These trends allow wireless users to collaborate with each other. We investigate various group communication paradigms that underly collaboration applications. We synthesize durations when members col…Wireless access is increasingly ubiquitous while mobile devices that use them are resource rich. These trends
allow wireless users to collaborate with each other. We investigate various group communication paradigms
that underly collaboration applications. We synthesize durations when members collaborate using wireless
device availability traces. Wireless users operate from a variety of locations. Hence, we analyzed the behavior
of wireless users in universities, corporations, conference venues, and city-wide hotspots. We show that the
availability durations are longer in corporations followed by university and then in hotspots. The number of
simultaneously available wireless users is small in all the scenarios. The session lengths are becoming smaller
while the durations between sessions are becoming larger. We observed user churn in all the scenarios. We
show that synchronous mechanisms require less effort to maintain update synchronicity among the group
members. However, distributed mechanisms require a large number of replicas in order to propagate updates
among the users. For asynchronous mechanisms, we show that pull-based mechanisms naturally randomize
the times when updates are propagated and thus achieve better performance than push based mechanisms.We
develop an adaptive approach that customizes the update frequency using the last session duration and show
that this mechanism exhibits good performance when the required update frequency intervals are large. We
also show that for a given number of gossips, it is preferable to propagate updates to all available nodes rather
than increasing the frequency while correspondingly reducing the number of nodes to propagate updates.We
develop a middleware to illustrate the practicality of our approach.
more »

Scope

EAI Endorsed Transactions on Mobile Communications and Applications is a scholarly archival journal that is committed to the timely publication of high-quality original research papers on all aspects of mobile communications theories, technologies, systems, and applications. All submissions will go…

Areas of interests include but are not limited to:

Mobile cellular networks
Mobile ad hoc networks
Mobile Internet
WiMAX networks
Vehicular networks
Wireless sensor networks
Satellite communications systems
Mobile system and network architectures
Network control and management
Mobility management
Modulation and coding techniques
Quality of service
Reliability and fault tolerance
Security and privacy
Mobile applications and services
Performance modelling and analysis

Topics

Areas of interests include but are not limited to:

Mobile cellular networks
Mobile ad hoc networks
Mobile Internet
WiMAX networks
Vehicular networks
Wireless sensor networks
Satellite communications systems
Mobile system and network architectures
Network control and man…

Areas of interests include but are not limited to:

Mobile cellular networks
Mobile ad hoc networks
Mobile Internet
WiMAX networks
Vehicular networks
Wireless sensor networks
Satellite communications systems
Mobile system and network architectures
Network control and management
Mobility management
Modulation and coding techniques
Quality of service
Reliability and fault tolerance
Security and privacy
Mobile applications and services
Performance modelling and analysis

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Special Issues

Dr. Nirwan Ansari (Department of Electrical and Computer Engineering, New Jersey Institute of Technology, USA)
Dr. Raj Jain (Department of Computer Science and Engineering, Washington University in St. Louis, USA)
Dr. Tigang Jiang (UESTC)
Dr. Nei Kato (Gradua…

Dr. Nirwan Ansari (Department of Electrical and Computer Engineering, New Jersey Institute of Technology, USA)
Dr. Raj Jain (Department of Computer Science and Engineering, Washington University in St. Louis, USA)
Dr. Tigang Jiang (UESTC)
Dr. Nei Kato (Graduate School of Information Sciences, Tohoku University, Japan)
Dr. Tiffany Jing Li (Department of Electrical and Computer Engineering, Lehigh University, USA)
Dr. Tommaso Melodia (Department of Electrical Engineering, State University of New York at Buffalo, USA)
Dr. Claude Oestges (Microwave Laboratory, Université catholique de Louvain (UCL), Belgium)
Dr. Kostas Pentikousis (European Research Centre, Huawei Technologies, Germany)
Dr. Charles E. Perkins (WiChorus Inc., USA)
Dr. Martin Reisslein (Department of Electrical Engineering, Arizona State University, USA)
Dr. David Simplot-Ryl (Fundamental Computer Science Laboratory, Centre de recherche INRIA Lille,
Dr. Wenye Wang (Department of Electrical and Computer Engineering, North Carolina State University, USA)
Dr. Baoxian Zhang (Graduate University, Chinese Academy of Sciences, China)
Dr. Cristian Borcea (NJIT)
Dr. Paolo Bellavista (University of Bologna)
Dr. Jian Ren (Michigan State University)
Dr. Lei Chen (Georgia Southern University)
Dr. Houbing Song (Embry-Riddle Aeronautical University)
Dr. Dalei Wu (The University of Tennessee at Chattanoog, USA)
Dr. Jianjun Yang, Department of Computer Science, University of North Georgia, USA
Dr. Qing Yang (University of North Texas)
Dr. Shaoen Wu (Ball State University, USA)
Dr. Dapeng Wu (Chongqing University of Posts and Telecommunications)
Dr. Ruoling Zhou, Department of Electrical and Computer Engineering, University of Massachusetts Dartmouth, USA

Journal Blurb

An open access journal focused on all aspects of mobile communications theories, technologies, systems, and applications, with no publishing fees.

Publisher: ICST
ISSN: 2032-9504
Volume: 1

Published: 3rd Aug 2012

EAI Endorsed Transactions on Mobile Communications and Applications

A Sensing Error Aware MAC Protocol for Cognitive Radio Networks

Logical Link Control and Channel Scheduling for Multichannel Underwater Sensor Networks

LOTIR: A Routing Protocol for Multi-hop V-to-I Communication Using Local Traffic Information

Cross–layer cross–domain adaptation of mobile video services

A Trace-Driven Analysis of Wireless Group Communication Mechanisms

Scope

Topics

Indexing

Special Issues

Editorial Board

Journal Blurb