21,629 research outputs found
A Joint Model for IEEE 802.15.4 Physical and Medium Access Control Layers
Many studies have tried to evaluate wireless networks and especially the IEEE
802.15.4 standard. Hence, several papers have aimed to describe the
functionalities of the physical (PHY) and medium access control (MAC) layers.
They have highlighted some characteristics with experimental results and/or
have attempted to reproduce them using theoretical models. In this paper, we
use the first way to better understand IEEE 802.15.4 standard. Indeed, we
provide a comprehensive model, able more faithfully to mimic the
functionalities of this standard at the PHY and MAC layers. We propose a
combination of two relevant models for the two layers. The PHY layer behavior
is reproduced by a mathematical framework, which is based on radio and channel
models, in order to quantify link reliability. On the other hand, the MAC layer
is mimed by an enhanced Markov chain. The results show the pertinence of our
approach compared to the model based on a Markov chain for IEEE 802.15.4 MAC
layer. This contribution allows us fully and more precisely to estimate the
network performance with different network sizes, as well as different metrics
such as node reliability and delay. Our contribution enables us to catch
possible failures at both layers.Comment: Published in the proceeding of the 7th International Wireless
Communications and Mobile Computing Conference (IWCMC), Istanbul, Turkey,
201
Energy-efficient wireless communication
In this chapter we present an energy-efficient highly adaptive network interface architecture and a novel data link layer protocol for wireless networks that provides Quality of Service (QoS) support for diverse traffic types. Due to the dynamic nature of wireless networks, adaptations in bandwidth scheduling and error control are necessary to achieve energy efficiency and an acceptable quality of service. In our approach we apply adaptability through all layers of the protocol stack, and provide feedback to the applications. In this way the applications can adapt the data streams, and the network protocols can adapt the communication parameters
On Energy Efficient Hierarchical Cross-Layer Design: Joint Power Control and Routing for Ad Hoc Networks
In this paper, a hierarchical cross-layer design approach is proposed to
increase energy efficiency in ad hoc networks through joint adaptation of
nodes' transmitting powers and route selection. The design maintains the
advantages of the classic OSI model, while accounting for the cross-coupling
between layers, through information sharing. The proposed joint power control
and routing algorithm is shown to increase significantly the overall energy
efficiency of the network, at the expense of a moderate increase in complexity.
Performance enhancement of the joint design using multiuser detection is also
investigated, and it is shown that the use of multiuser detection can increase
the capacity of the ad hoc network significantly for a given level of energy
consumption.Comment: To appear in the EURASIP Journal on Wireless Communications and
Networking, Special Issue on Wireless Mobile Ad Hoc Network
Implementation of a Wake-up Radio Cross-Layer Protocol in OMNeT++ / MiXiM
This paper presents the DoRa protocol, which is a new cross-layer protocol
for handling the double radio of nodes in wake-up radio scenario. The
implementation details in OMNET++/MiXiM are also given, with a focus on the
implemented MAC layers. The main goal of the DoRa protocol is to reduce energy
consumption in wireless sensor network, by taking full advantage of the passive
wake-up scheme. The performance of the DoRa protocol is then evaluated and
results are compared with B-MAC and IEEE 802.15.4 protocols.Comment: Published in: A. F\"orster, C. Minkenberg, G. R. Herrera, M. Kirsche
(Eds.), Proc. of the 2nd OMNeT++ Community Summit, IBM Research - Zurich,
Switzerland, September 3-4, 2015, arXiv:1509.03284, 201
JTP: An Energy-conscious Transport Protocol for Wireless Ad Hoc Networks
Within a recently developed low-power ad hoc network system, we present a transport protocol (JTP) whose goal is to reduce power consumption without trading off delivery requirements of applications. JTP has the following features: it is lightweight whereby end-nodes control in-network actions by encoding delivery requirements in packet headers; JTP enables applications to specify a range of reliability requirements, thus allocating the right energy budget to packets; JTP minimizes feedback control traffic from the destination by varying its frequency based on delivery requirements and stability of the network; JTP minimizes energy consumption by implementing in-network caching and increasing the chances that data retransmission requests from destinations "hit" these caches, thus avoiding costly source retransmissions; and JTP fairly allocates bandwidth among flows by backing off the sending rate of a source to account for in-network retransmissions on its behalf. Analysis and extensive simulations demonstrate the energy gains of JTP over one-size-fits-all transport protocols.Defense Advanced Research Projects Agency (AFRL FA8750-06-C-0199
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