Cross-Layer Exploitation of MAC Layer Diversity in Wireless Networks

Cao, Min; Raghunathan, Vivek; Kumar, Puli Kishore

doi:10.1109/icnp.2006.320183

Cited by 24 publications

(22 citation statements)

References 23 publications

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“…A measurement-driven deployment methodology has been developed for two-tier mesh access networks by leveraging the measurement data. To exploit MAC layer diversity in wireless networks, the authors in [77] conduct experiments to demonstrate that multipath fading effects are seen at the MAC layer. These effects appear at timescales on the same order of the IEEE 802.11 protocol and, therefore, interact negatively with the RTS-CTS-DATA-ACK handshake.…”

Section: F Real System Evaluation For Cross-layer Designmentioning

confidence: 99%

Cross-Layer Design for QoS Support in Multihop Wireless Networks

Zhang

2008

Proc. IEEE

151

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Section: F Real System Evaluation For Cross-layer Designmentioning

confidence: 99%

Cross-Layer Design for QoS Support in Multihop Wireless Networks

Zhang

2008

Proc. IEEE

151

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“…Opportunistic channel selection in a localized sense has been considered in MAC protocols such as DB-MCMAC [22], etc.…”

Section: Related Workmentioning

confidence: 99%

Channel and Interface Management in a Heterogeneous Multi-Channel Multi-Radio Wireless Network

Bhandari

Vaidya

2009

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As new application scenarios for multi-hop wireless networks emerge, there has been an effort to improve performance in these networks by leveraging available physical layer diversity in the form of multiple channels, radio-interfaces, antennas, etc. However, designing cross-layer protocols that are capable of addressing a wide range of heterogeneous hardware characteristics can be very challenging. Theoretical results on scheduling provide a valuable set of tools to understand the structure of good network control algorithms for diverse scenarios; but these usually involve highly idealized assumptions that hinder their applicability. In this paper, we present a Layer 2.5 protocol solution for multi-channel multiradio wireless networks with heterogeneous channel and radio-interface characteristics, whose design draws upon known theoretical results, but which takes into account practical concerns that arise in real-world networks. This design provides a proof-of-concept of the possibility of evolving practical cross-layer designs that are rooted in sound theoretical principles.

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“…Depending on the environment, this fading can interact with the timescales of IEEE 802.11. This coupling between fading effects and IEEE 802.11 handshaking can result in two problems [1]:…”

Section: Introductionmentioning

confidence: 99%

Robust Floor Acquisition in the Presence of Multiple Fading Channels

Cao¹,

Raghunathan²,

Kumar³

2006

2006 40th Annual Conference on Information Sciences and Systems

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In this paper, we investigate the impact of multipath fading on the floor acquisition mechanism of IEEE 802.11, and exploit multi-channel diversity to combat its adverse effects. We first provide experimental data to show that multi-path fading effects observed at the MAC layer appear at timescales that can interact negatively with the RTS-CTS-DATA-ACK handshake. These multi-path fading effects often result in control packets being destroyed, and cause the handshaking mechanism to malfunction. We identify two problems that result from this negative interaction, viz., the fading exposed and fading hidden terminal problems. Testbed measurements indicate that these multipath fading effects are statistically uncorrelated across different frequency channels. The presence of such multiple independent channels provides an additional degree of freedom to mitigate the negative impact of multipath fading. We exploit this multi channel diversity to design SIX, a state information exchange protocol that distributes MAC state information among neighbors. This information can be used to undo mistakes made in setting the IEEE 802.11 network allocation vector (NAV), a procedure we term NAV overriding. Furthermore, the transmitter can use this information to do receiver selection to the neighbor with the best link condition. These mechanisms combine to provide a robust floor acquisition mechanism that exploits MAC layer diversity in lossy environments. We evaluate the effectiveness of the SIX scheme with ns-2 simulations, and show that it can successfully harness multi-channel diversity to achieve reliable floor acquisition and improve performance as compared to the baseline IEEE 802.11 MAC.

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Cross-Layer Exploitation of MAC Layer Diversity in Wireless Networks

Cited by 24 publications

References 23 publications

Cross-Layer Design for QoS Support in Multihop Wireless Networks

Cross-Layer Design for QoS Support in Multihop Wireless Networks

Channel and Interface Management in a Heterogeneous Multi-Channel Multi-Radio Wireless Network

Robust Floor Acquisition in the Presence of Multiple Fading Channels

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