Multi-Carrier Burst Contention (MCBC): Scalable Medium Access Control for Wireless Networks

Roman, Bogdan; Stajano, Frank; Wassell, I.J.; Cottingham, David N.

doi:10.1109/wcnc.2008.298

Cited by 20 publications

(12 citation statements)

References 18 publications

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“…While the ideas bear similarity to ours, they are not targeted towards contention resolution. [9] presents a scheme in which contention between active APs is resolved by other referee APs that provide feedback using OFDM subcarriers. Such an approach imposes tight synchronization requirements similar to [3].…”

Section: Related and On-going Workmentioning

confidence: 99%

Listen (on the frequency domain) before you talk

Sen

Choudhury

Nelakuditi

2010

Proceedings of the 9th ACM SIGCOMM Workshop on Hot Topics in Networks

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Conventional WiFi networks perform channel contention in time domain. This is known to be wasteful because the channel is forced to remain idle, while all contending nodes are backing off for multiple time slots. This paper proposes to break away from convention and recreate the backing off operation in the frequency domain. Our basic idea is to pretend that OFDM subcarriers are integer numbers, and thereby, view today's random backoff process as equivalent to transmitting on a randomly chosen subcarrier. By employing a second antenna to listen to all the subcarriers, each node can determine whether its chosen integer (or subcarrier) is the smallest among all others. In fact, each node can even determine the rank of its chosen integer, enabling the feasibility of a TDMA-like schedule from every round of contention. We develop these ideas into a Time to Frequency (T2F) protocol and prototype it on a small testbed of 8 USRPs. Experiments confirm its feasibility, along with promising throughput gains of more than 35% at high bit rates. A fuller design and thorough evaluation of T2F is a topic of ongoing work.

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Section: Related and On-going Workmentioning

confidence: 99%

Listen (on the frequency domain) before you talk

Sen

Choudhury

Nelakuditi

2010

Proceedings of the 9th ACM SIGCOMM Workshop on Hot Topics in Networks

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“…Nodes with data to send first sense the channel for a duration of a Distributed Interframe Space (34 for the OFDM PHY) and if it is idle, they initiate a counter to a random value between 0 and a contention window (CW) size less one. The counter is decremented every backoff slot (9 for the OFDM PHY). While decrementing, nodes continue to sense the channel and will freeze their counter in case they detect the channel as busy.…”

Section: A Ieee 80211mentioning

confidence: 99%

“…In this section we briefly summarize the main features of MCBC. A more detailed description can be found in [9]. The contention algorithm will be explained using an example.…”

Section: B Multi-carrier Burst Contention (Mcbc)mentioning

confidence: 99%

“…We consider the OFDM-based IEEE 802.11 protocols (e.g. a/g) and our recently proposed Multi-Carrier Burst Contention (MCBC) [9] protocol that we have implemented in hardware. MCBC, which makes use of a novel node elimination algorithm and exploits both time and frequency domains of the underlying OFDM PHY layer, imposes some synchronization requirements but yields very good performance in ideal channel conditions.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Multi-Carrier Burst Contention and IEEE 802.11 with fading during channel sensing

Roman

Chatzigeorgiou

Wassell

et al. 2009

2009 IEEE 20th International Symposium on Personal, Indoor and Mobile Radio Communications

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Abstract-With the prevalence of wireless capability in mobile devices and the increasing number of wireless network deployments where protocols using carrier sensing (such as IEEE 802.11) are employed, it is important to understand the impact of fading during the channel sensing period and its direct effects on performance in realistic environments. In this paper we evaluate the performance of IEEE 802.11 and that of our proposed cross-layer Multi-Carrier Burst Contention (MCBC) protocol, which we have implemented in hardware, in realistic indoor fading environments with no direct line of sight. We present thorough simulation results, backed up by hardware and real-world measurements, performance issues for each protocol and describe methods for increasing resilience to fading during channel sensing in order to improve performance.

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“…The proposed scheme, Multi-Carrier Burst Contention (MCBC), employs a rapidly converging node elimination algorithm [18] and synchronized rounds. We compare MCBC to IEEE 802.11p and show that it is scalable in performance, resilient to environment and topology changes and capable to provide prioritized access.…”

mentioning

confidence: 99%

Scalable Cross-Layer Wireless Access Control Using Multi-Carrier Burst Contention

Roman

Wassell

Chatzigeorgiou

2011

IEEE J. Select. Areas Commun.

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Abstract-The increasing demand for wireless access in vehicular environments (WAVE) supporting a wide range of applications such as traffic safety, surveying, infotainment etc., makes robust channel access schemes a high priority. The presence of selective fading, variable topologies, high density of nodes and feasibility issues represent important challenges in vehicular networks. We present Multi-Carrier Burst Contention, a crosslayer protocol based on a contention scheme that spans both time and frequency domains, employing short and unmodulated energy bursts and a randomized and recursive node-elimination mechanism in order to resolve collisions. It can overcome many of the vehicular environment challenges and provide desirable WAVE features such as scalability, robustness, prioritized access and others. We address physical layer related challenges, present an analytical model, hardware implementation and performance results from theoretical analysis, hardware measurements and simulations, which were run in comparison with the IEEE 802.11p. The results show high scalability and resilience to channel fading and variable topologies and a considerable performance improvement over IEEE 802.11p.

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Multi-Carrier Burst Contention (MCBC): Scalable Medium Access Control for Wireless Networks

Cited by 20 publications

References 18 publications

Listen (on the frequency domain) before you talk

Listen (on the frequency domain) before you talk

Evaluation of Multi-Carrier Burst Contention and IEEE 802.11 with fading during channel sensing

Scalable Cross-Layer Wireless Access Control Using Multi-Carrier Burst Contention

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