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Cognitive PHY and MAC layers for dynamic spectrum access and sharing of TV bands

Carlos Cordeiro, Kiran Challapali, Monisha Ghosh
2006 Proceedings of the first international workshop on Technology and policy for accessing spectrum - TAPAS '06  
In this paper we address these questions by presenting the design and performance evaluation of a CR-based PHY and MAC for DSA and DSS of vacant television (TV) channels.  ...  (DSM) operation also exists [9], but this is not the focus of this paper. 3 In this work, the term air interface is used to refer to the PHY and MAC layers of the ISO/OSI protocol reference model [4]  ...  The Multi-channel MAC (MMAC) [22] protocol has the primary goal of overcoming the multi-channel hidden terminal problem present in many multi-channel MAC protocols based on a single The Multi-channel  ... 
doi:10.1145/1234388.1234391 fatcat:ubpuhe47mbacnaj4ugv4s7tw34

On the Mechanical and Thermal Stability of Free-standing Monolayer Amorphous Carbon [article]

Levi C. Felix, Raphael M. Tromer, Luiz A. Ribeiro Junior, Douglas S. Galvao
2020 arXiv   pre-print
MAC is a pure carbon structure composed of five, six, seven and eight atom rings randomly distributed. MAC proved to be surprisingly stable and highly fracture resistant.  ...  While PG after a critical strain threshold goes directly from elastic to brittle regimes, MAC shows different elastic stages between these two regimes.  ...  L.A.R.J acknowledges the financial support from a Brazilian Research Council FAP-DF and CNPq grants 00193.0000248∕2019 − 32 and 302236∕2018 − 0, respectively.  ... 
arXiv:2002.04682v1 fatcat:xxltvjixgjaqviig6caddhyque

Design of a visible-light-communication enhanced WiFi system [article]

Sihua Shao, Abdallah Khreishah, Moussa Ayyash, Michael B. Rahaim, Hany Elgala, Volker Jungnickel, Dominic Schulz, Thomas D.C. Little
2015 arXiv   pre-print
One is the hybrid WiFi-VLC system, utilizing unidirectional VLC channel as downlink and reserving the WiFi back-channel as uplink.  ...  To further enhance the robustness and increase throughput, the other system is presented, in which we aggregate WiFi and VLC in parallel by leveraging the bonding technique in Linux operating system.  ...  In this paper, we propose and implement a practical hybrid system comprised of typical IEEE 802.11 a/b/g/n technology and a VLC link, in which the unidirectional VLC channel is exploited to supplement  ... 
arXiv:1503.02367v2 fatcat:nmn3vmvp4jayjm6k64tt3ocp64

Spectrum Bonding and Aggregation with Guard-Band Awareness in Cognitive Radio Networks

Haythem A. Bany Salameh, Marwan Krunz, David Manzi
2014 IEEE Transactions on Mobile Computing  
Based on the proposed channel assignment algorithm, we develop an operational MAC protocol that enables DSA users to dynamically utilize the spectrum.  ...  The proposed protocol realizes our channel assignment algorithm in a distributed manner while relying only on information provided by the two communicating users.  ...  CHANNEL ACCESS PROTOCOL Protocol Overview We integrate our guardband-aware SFLP channel assignment algorithm into a distributed multi-channel MAC protocol for CRNs with a common control channel.  ... 
doi:10.1109/tmc.2013.11 fatcat:23dtppeucnhv5eog4zypwbbone

Opportunistic Spectrum Sharing in Dynamic Access Networks: Deployment Challenges, Optimizations, Solutions, and Open Issues [article]

Haythem Bany Salameh
2016 arXiv   pre-print
Protocols that consider such interaction are described.  ...  The impact of guard bands on the design of opportunistic spectrum access protocols is also investigated.  ...  These protocols, however, require additional hardware support (i.e., duplexers). The practical aspects of using FD radios in CRNs need to be further investigated.  ... 
arXiv:1605.02230v1 fatcat:5fmktimujbgt5nm4odduihd4tq

Barrier Free Internet Access: Evaluating the Cyber Security Risk Posed by the Adoption of Bring Your Own Devices to e-Learning Network Infrastructure

E. T., Richard Y., Seth D.
2017 International Journal of Computer Applications  
BYOD, since its emergence in 2009, courtesy of Intel, is now a common practice in many organizations.  ...  This paper presents an assessment of a WLAN network which has been deployed for a campus-wide data centric e-learning platform at Kwame Nkrumah University of Science and Technology (KNUST) towards the  ...  Use high load dual channel routers and APs that can use channel bonding and multiple data rates, and use PoE so they can be easily placed at vantage points on premises [15] .  ... 
doi:10.5120/ijca2017915581 fatcat:dccsd3caebbfvhpfwxu35uncum

A State-of-the-Art Review on the Security of Mainstream IoT Wireless PAN Protocol Stacks

Georgios Kambourakis, Constantinos Kolias, Dimitrios Geneiatakis, Georgios Karopoulos, Georgios Michail Makrakis, Ioannis Kounelis
2020 Symmetry  
Considering the still heterogeneous nature of the majority of IoT protocols, a major concern is to find common references for investigating and analyzing their security and privacy threats.  ...  ) protocols, namely BLE, Z-Wave, ZigBee, Thread, and EnOcean.  ...  Once the maximum number of keys supported by the device has been installed, whenever a new bonding request is received, the device will delete one of the keys to give its place to a new one.  ... 
doi:10.3390/sym12040579 fatcat:3ajcbbciondlrjnv73fwzph5pu

On Quality-of-Service Provisioning in IEEE 802.11ax WLANs

Der-Jiunn Deng, Shao-Yu Lien, Jorden Lee, Kwang-Cheng Chen
2016 IEEE Access  
In WLANs, medium access control protocol is the key component that enables efficient sharing the common radio channel while satisfying the quality of service (QoS) requirements for multimedia applications  ...  Then, we summarize the IEEE 802.11ax standardization activities in progress and present an overview of current perspectives and expected features on medium access control protocol design to better support  ...  Channel bonding and MU-MIMO technologies are supported. IEEE 802.11ay is expected to be released also in 2019.  ... 
doi:10.1109/access.2016.2602281 fatcat:2wi7hxlqbvgmrfvicftc5r6bne

The Audacity of Fiber-Wireless (FiWi) Networks [chapter]

Martin Maier, Navid Ghazisaidi, Martin Reisslein
2009 Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering  
A plethora of enabling optical and wireless technologies have been emerging that can be used to build future-proof bimodal fiber-wireless (FiWi) broadband access networks.  ...  The draft provides both PHY and MAC enhancements. By using MIMO-OFDM and channel bonding, 802.11n WLANs offer raw data rates of about 600 Mb/s at the physical layer.  ...  In 802.11n, the following two methods exist for frame aggregation: (i) aggregate MAC protocol data unit (A-MPDU), and (ii) aggregate MAC service data unit (A-MSDU).  ... 
doi:10.1007/978-3-642-04648-3_2 fatcat:t5legtupnfdr7g4d2ndji65vqe

PON Convergence

2018 IEICE transactions on communications  
The history of PON standardization is reviewed in brief as a way to explain how the industry arrived at its current divergent form.  ...  The reasons why convergence is favorable are enumerated, with a focus on what has changed since the last round of standardization. Finally, some paths forward are proposed.  ...  The third reason why convergence is more likely is that all parties realize the importance of channel bonding.  ... 
doi:10.1587/transcom.2017oai0001 fatcat:jje2zsaa5reqziijq4zpy5zm7u

Enabling Technologies for Ultra-Reliable and Low Latency Communications: From PHY and MAC Layer Perspectives

Gordon J. Sutton, Jie Zeng, Ren Ping Liu, Wei Ni, Diep N. Nguyen, Beeshanga A. Jayawickrama, Xiaojing Huang, Mehran Abolhasan, Zhang Zhang, Eryk Dutkiewicz, Tiejun Lv
2019 IEEE Communications Surveys and Tutorials  
We provide a comprehensive discussion on physical (PHY) and medium access control (MAC) layer techniques that enable URLLC, addressing both licensed and unlicensed bands.  ...  The paper evaluates the relevant PHY and MAC techniques for their ability to improve the reliability and reduce the latency.  ...  A centralized directional CSMA/CA protocol, which extends directional MAC (D-MAC) [183] , is proposed to alleviate the problem [182] .  ... 
doi:10.1109/comst.2019.2897800 fatcat:jgaahgi27rev3ieyrisn2yvh5m

Who Am I Online? Examining Voluntary Use as Symbolic-Collective Action

Rennie Naidoo
2014 The Information Society  
User feedback on a health care insurance firm's electronic service in South Africa was analyzed qualitatively using pattern matching to test the model's propositions.  ...  This article reports on a test of an integrated voluntary information technology use model that draws on social identity theory to extend the functional utility model of the user.  ...  The limitation of a theory-guided research process is that it may introduce strong bias, as here a researcher finds evidence in support of a theory.  ... 
doi:10.1080/01972243.2014.944727 fatcat:ptejud2o4vfdhg6wjurk6grgam

Dynamic Spectrum Sharing in 5G Wireless Networks With Full-Duplex Technology: Recent Advances and Research Challenges

Shree Krishna Sharma, Tadilo Endeshaw Bogale, Long Bao Le, Symeon Chatzinotas, Xianbin Wang, Bjorn Ottersten
2018 IEEE Communications Surveys and Tutorials  
Full-Duplex (FD) wireless technology enables a radio to transmit and receive on the same frequency band at the same time, and it is considered to be one of the candidate technologies for the fifth generation  ...  than the HD-based MAC protocol.  ...  It has been shown that the proposed FD-MAC protocol provides significantly higher throughput than the HD-MAC protocol. D.  ... 
doi:10.1109/comst.2017.2773628 fatcat:32mgsszlufh2nktg3nlbyzamva

Modeling WiFi Active Power/Energy Consumption in Smartphones

Li Sun, Ramanujan K. Sheshadri, Wei Zheng, Dimitrios Koutsonikolas
2014 2014 IEEE 34th International Conference on Distributed Computing Systems  
We study the properties of the model in relation to other parameters such as the packet size and/or the transport layer protocol, and we evaluate its accuracy under a variety of scenarios which have not  ...  We then focus on a recent approach modeling the active power consumption as a function of the application layer throughput.  ...  ACK (FA/BA), channel bonding, MIMO 1 -define a large number of active power states.  ... 
doi:10.1109/icdcs.2014.13 dblp:conf/icdcs/SunSZK14 fatcat:gojttiwx4bbxnir3gb56nqswku

Multi-Cell LTE-U/Wi-Fi Coexistence Evaluation Using a Reinforcement Learning Framework

José M. de C. Neto, Sildolfo F. G. Neto, Pedro M. de Santana, Vicente A. de Sousa
2020 Sensors  
of a multi-cell environment.  ...  In this work, we extend the literature by analyzing a multi-cell LTE-U/Wi-Fi coexistence scenario, with a high interference profile and data rates targeting a cellular broadband IoT deployment.  ...  Acknowledgments: The proof of concept simulations provided by this paper was supported by the High-Performance Computing Center at UFRN (NPAD/UFRN).  ... 
doi:10.3390/s20071855 pmid:32230829 pmcid:PMC7181158 fatcat:5boaz6wrjzhmdi6hx6yqcxxutq
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