On the scalability of IEEE 802.11 ad hoc networks

Huang, Lifei; Lai, Ten-Hwang

doi:10.1145/513800.513822

Cited by 128 publications

(49 citation statements)

References 6 publications

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“…By using the DCF mechanism, enabling the features of PSM is difficult, because it does not contain an access point. Nodes in the PS mode are expected to synchronize among themselves in a distributed way (Huang and Lai, 2002;Tseng et al, 2003). In ad-hoc environment, source should inform by giving an advertisement through ATIM during the packet Advertisement period (ATIM window).…”

Section: Methodsmentioning

confidence: 99%

Cross-Layer Design for Reducing the Energy Consumption based on Mobility Parameter in DSR for Mobile Ad-Hoc Network

A.¹

2012

Journal of Computer Science

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Problem statement:The main idea is to design an energy efficient algorithm for reducing the amount of overhearing based on RSS value in a Mobile Ad-hoc Network (MANET). Approach: A cross layer framework is designed by combining the physical, MAC and network layer. RSS value is taken from the physical layer and it is used for finding the Mobility Parameter (MP). MP value determines the level of overhearing and rebroadcast probability. The energy conservation is achieved by integrating the 802.11 PSM with DSR. In 802.11 PSM, all the nodes are in low power sleep state, but the disadvantage here is unconditional overhearing. So, a conditional overhearing mechanism is proposed based on mobility parameter to reduce the energy consumption. This mechanism reduces energy consumption but at the same time, the node mobility results in more stale routes in route cache of DSR over a period of time. This occurs due to the lack of route cache updation. In the proposed design, RSS value determines whether to select the link or not prior to the route discovery process. Results: Simulation results are compared for Packet Delivery Ratio (PDR) and energy consumption. MP based conditional overhearing shows a 3.2% PDR improvement. It achieves a 20% power saving, if the pause time crosses 300 sec. For the packet injection rate of 2 packets/sec, under no mobility condition, it utilizes 50 joules lesser energy consumption compared to Random Cast. Conclusion: The NS-2 simulation results reveal that the proposed work is energy efficient by reducing the amount of overhearing and also it eliminates the stale routes compared to the classical methods.

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Section: Methodsmentioning

confidence: 99%

Cross-Layer Design for Reducing the Energy Consumption based on Mobility Parameter in DSR for Mobile Ad-Hoc Network

A.¹

2012

Journal of Computer Science

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“…However, we note that accurate frame synchronization acquisition is only required for the interaction between neighboring nodes. A number of synchronization mechanisms have been proposed and studied for the operation in a multi-hop network environment (e.g., [30][31][32]). The time unit of the super frame is of a much larger time scale than that of a packet transmission time, while CSMA/CA is used in our simulation as the underlying MAC protocol for packet transmissions.…”

Section: Appendix: the Mbn-ps Protocolmentioning

confidence: 99%

Bit-per-joule performance of power saving ad hoc networks with a mobile backbone

Huang

Rubin

2008

Wireless Netw

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Energy efficient MAC protocols have been developed for wireless sensor and mobile ad hoc networks so that inactive nodes can transition into sleep state to conserve energy. It has been recognized that maintaining a continuously awake connected dominating set (CDS) serves to reduce the route setup latency. Under the mobile backbone network (MBN) architecture introduced by Rubin et al., a mobile backbone (Bnet) is dynamically constructed to provide a topological covering of the network. The MBN employs a hybrid routing algorithm under which flows that travel a distance longer than a threshold are directed along routes across the Bnet. In turn, a limited span network-wide global route discovery process is applied for routing shorter distance flows. In this paper, we introduce and analyze an MBN based power saving protocol (MBN-PS) that employs this hybrid routing scheme. Under the MBN-PS scheme, dynamically elected backbone nodes are kept awake, while inactive non-backbone nodes can reside in sleep state. We analytically show that, when the number of network flows is above a minimal level, the throughput per watt efficiency attained in an ad hoc network under complete backbone coverage is better than that achieved by a corresponding network that does not form a backbone. We present a model for the calculation of the bit-per-joule performance of the network as a function of the distance threshold. We confirm the validity of our analytical approach through simulations. Using our method, a network designer is able to choose the optimal distance threshold to be used by this scheme, based on traffic loading conditions.

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“…In particular, IEEE 802.11, the de facto standard for WLAN technology, was originally designed without inherent support for QoS required by multimedia services such as VoIP. Problems such as unpredictable delay jitters due to random contention, bursty packet losses due to wireless interference and user mobility, poor scalability, and lack of security have been identified and under investigation by many research endeavors [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Enhancing VoIP service for ubiquitous communication in a campus WLAN with partial coverage

Hsieh¹,

Lin²,

Lin³

2008

Computer Networks

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On the scalability of IEEE 802.11 ad hoc networks

Cited by 128 publications

References 6 publications

Cross-Layer Design for Reducing the Energy Consumption based on Mobility Parameter in DSR for Mobile Ad-Hoc Network

Cross-Layer Design for Reducing the Energy Consumption based on Mobility Parameter in DSR for Mobile Ad-Hoc Network

Bit-per-joule performance of power saving ad hoc networks with a mobile backbone

Enhancing VoIP service for ubiquitous communication in a campus WLAN with partial coverage

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