Using directional antennas for medium access control in ad hoc networks

Choudhury, Romit Roy; Yang, Xue; Ramanathan, Ram; Vaidya, Nitin H.

doi:10.1145/570645.570653

Cited by 552 publications

(216 citation statements)

References 10 publications

Supporting

Mentioning

211

Contrasting

Unclassified

Order By: Relevance

“…The beamforming issue has been studied extensively in traditional wireless networks [18]- [20]. However, all these previous methods do not consider the variation of the spectrum availability.…”

Section: B Network Modelmentioning

confidence: 99%

Enhancing channel rendezvous in cognitive radio networks with directional antennas

Song

Xie

2015

2015 IEEE International Conference on Communications (ICC)

View full text Add to dashboard Cite

In cognitive radio (CR) networks, channel rendezvous is a significant operation for two secondary users (SUs) to find a common available channel and establish a link between them. Currently, all previous channel rendezvous designs make the same assumption to ensure that the channel rendezvous process is successful: there must exist at least one common available channel between the SU transmitting pair. However, this assumption is not always feasible. When the number of primary users (PUs) is large, there could be no common available channel between two SUs. This issue results in serious problems in successfully implementing channel rendezvous in CR networks. In this paper, a framework is proposed to tackle this issue by using directional antennas instead of traditionally used omnidirectional antennas. Our proposed framework aims to ensure that the probability that the SU pair have at least one common available channel is larger than a pre-defined threshold. Meanwhile, given a channel rendezvous scheme, the average channel rendezvous delay is minimized. Simulation results show that the proposed framework significantly outperforms the scenario with omni-directional antennas in terms of the probability of successful channel rendezvous when the number of PUs is large. To the best of our knowledge, this is the first paper that utilizes directional antennas to enhance the channel rendezvous performance in CR networks.

show abstract

Section: B Network Modelmentioning

confidence: 99%

Enhancing channel rendezvous in cognitive radio networks with directional antennas

Song

Xie

2015

2015 IEEE International Conference on Communications (ICC)

View full text Add to dashboard Cite

show abstract

“…The early work by Chaudhry et al [4] made a big progress in the development of DMAC, where the key components of IEEE 802.11 MAC like RTS/CTS handshake, network allocation vector (NAV), channel sensing and backoff were all utilized. In the protocol, receivers listen to the RTS in omnidirectional mode while the CTS, DATA and ACK are exchanged directionally.…”

Section: Related Workmentioning

confidence: 99%

“…The antenna includes M sectors to cover 360 o and the beam widths are xed and identical. The antenna can be either xed directional elements [4] or adaptive array [12] capable of steering its beam to the desired direction. A node always uses the directional antenna to either transmit or receive on one sector directionally at a moment.…”

Section: A Network and Antenna Modelmentioning

confidence: 99%

“…In the FDD-MAC protocol, we employ the directional NAV (DNAV) as proposed in [4] and [13] to tackle the hidden terminal problem. Each node keeps a DNAV for each sector or direction and updates DNAV from the duration eld of the overhead DRTS/DCTS frames, similar to the mechanism used in the IEEE 802.11 MAC protocol.…”

Section: B Dnav and Aoa Catchingmentioning

confidence: 99%

“…However, employing the directional antennae in wireless ad hoc networks introduces new challenges, i.e., the deafness problems [4]. Because all nodes are asynchronous and operate independently, a node may switch to any antenna sector at a moment.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A fully-distributed directional-to-directional MAC protocol for mobile ad hoc networks

Niu

Zhang

Cai

et al. 2015

2015 International Conference on Computing, Networking and Communications (ICNC)

View full text Add to dashboard Cite

The use of directional antennae in ad hoc networks can provide high spatial reuse of spectrum and antenna gains. However, employment of directional antennae poses great challenges such as hidden terminal and deafness problems. The existing directional medium access control (DMAC) protocols usually work in a switching mode of omnidirectional listening and directional sending, which, however, introduces high hardware complexity and asymmetry-in-gain. In this paper, we propose a new fully-distributed directional-to-directional MAC protocol (FDD-MAC) for mobile ad hoc networks (MANETs) where all nodes operate in the directional-only mode. A scanning scheme over the antenna sectors is designed in which random periods are scheduled for listening and sending alternatively in each sector for link establishment. Meanwhile, the burst directional ready-to-send RTS (BDRTS) frame and angle-of-arrival (AoA) caching scheme are also exploited to improve the ef ciency. Extensive simulations are conducted to compare the performance of FDD-MAC and other MAC protocols, including link success probability, network throughput, and service delay. The results show that FDD-MAC is effective and ef cient in solving the deafness problem in MANETs, especially with high node density and traf c load.

show abstract