Papers by Abubakar Aminu Mu'azu
Proceedings of the 2nd ACM …, Jan 1, 2005
One of the key goals of a vehicular ad-hoc network (VANET) is providing sufficient quality of ser... more One of the key goals of a vehicular ad-hoc network (VANET) is providing sufficient quality of service (QoS) for real-time safety applications while concurrently supporting commercial services. This paper proposes a multi-channel wireless communication architecture and protocol for the scenario where commercial services are provided by roadside infrastructure. This solution extends the IEEE 802.11 wireless LAN protocol to schedule periodic safety messages in a "safety channel". It explicitly supports concurrent non-time-critical communications in separate, non-safety "service channels". Further, it is shown that this arrangement maximizes service channel access time while maintaining the requisite QoS for safety applications. This paper concludes with simulations that confirm the attractive properties of this architecture and protocol.
VDE-Kongress 2006, Jan 1, 2006
Car-to-car communication aims at increased driving comfort and safety. Moreover, it changes the r... more Car-to-car communication aims at increased driving comfort and safety. Moreover, it changes the role of vehicles from mere transportation means to "smart objects". Despite many R&D activities in the last years, this technology still poses multiple challenges on the wireless transmission and network protocols. Aspects like efficient message dissemination, network scalability, and information security mechanisms are still major research areas in the area of vehicular ad hoc networks. In this paper we present the potential of future car-to-car and car-to-environment communication systems, introduce the major research challenges in this field, and provide a selection of current research results.
Clustering-based multichannel MAC protocols for QoS provisionings over vehicular ad hoc networks
IEEE Transactions on Vehicular Technology, Jan 1, 2007
Routing Protocols for Vehicular Ad Hoc Networks That Ensure Quality of Service
The Fourth International Conference on …, Jan 1, 2008
... 3 Timeline and Classification In this section, we present a timeline of QoS VANET rout-ing pr... more ... 3 Timeline and Classification In this section, we present a timeline of QoS VANET rout-ing protocols and a qualitative comparison of them. ... AODV MURU PBR DSR Figure 1: Timeline and Potential Influence of QoS VANET Routing Protocols approaches, and requirements. ...
Communications …, Jan 1, 2008
Vehicular networks are a very promising technology to increase traffic safety and efficiency and ... more Vehicular networks are a very promising technology to increase traffic safety and efficiency and to enable numerous other applications in the domain of vehicular communication. Proposed applications for VANETs have very diverse properties and often require non-standard communication protocols. Moreover, the dynamics of the network due to vehicle movements further complicates the design of an appropriate, comprehensive communication system. In this work, we collect and categorize envisioned applications from various sources and classify the unique network characteristics of vehicular networks. Based on this analysis, we propose five distinct communication patterns that form the basis of almost all VANET applications. Both the analysis and the communication patterns shall deepen the understanding of VANETs and simplify further development of VANET communication systems.
Proceedings of the 1st …, Jan 1, 2004
One key usage of VANET is to support vehicle safety applications. This use case is characterized ... more One key usage of VANET is to support vehicle safety applications. This use case is characterized by the prominence of broadcasts in scaled settings. In this context, we try to answer the following questions: i) what is the probability of reception of a broadcast message by another car depending on its distance to the sender, ii) how to give priority access and an improved reception rate for important warnings, e.g., sent out in an emergency situation , and iii) how are the above two results affected by signal strength fluctuations caused by radio channel fading? We quantify via simulation the probability of reception for the two-ray-ground propagation model as well as for the Nakagami distribution in saturated environments. By making use of some IEEE 802.11e EDCA mechanisms for priority access, we do not only quantify how channel access times can be reduced but also demonstrate how improved reception rates can be achieved. Our results show that the mechanisms for priority access are successful under the two-way-ground model. However, with a non-deterministic radio propagation model like Nakagami's distribution the benefit is still obvious but the general level of probability of reception is much smaller compared to two-ray-ground model. The results indicate that -particularly for safety-critical and sensor network type of applications -the proper design of repetition or multi-hop retransmission strategies represents an important aspect of future work for robustness and network stability of vehicular ad hoc networks.
Quality of Service, …, Jan 1, 2006
In this paper, we present a QoS routing protocol called GVGrid for multi-hop mobile ad hoc networ... more In this paper, we present a QoS routing protocol called GVGrid for multi-hop mobile ad hoc networks constructed by vehicles, i.e., vehicular ad hoc networks (VANETs). GVGrid constructs a route on demand from a source (a fixed node or a base station) to vehicles that reside in or drive through a specified geographic region. The goal of GVGrid is to maintain a high quality route, i.e. a robust route for the vehicles' movement. Such a route can be used for high quality communication and data transmission between roadsides and vehicles, or between vehicles. The experimental results have shown that GVGrid could provide routes with longer lifetime, compared with an existing routing protocol for VANETs.
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Papers by Abubakar Aminu Mu'azu