Results 251 to 260 of about 1,034,587 (282)

Dynamic spectrum access

2015
Introduction The previous chapter touched on the concept that devices could share spectrum on a “dynamic” basis. So, for example, if a primary user was not using spectrum in a given location at a particular time then a secondary user might opportunistically make use of it.
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Blockchain-Enabled Dynamic Spectrum Access: Cooperative Spectrum Sensing, Access and Mining

2019 IEEE Global Communications Conference (GLOBECOM), 2019
Traditionally, dynamic spectrum access (DSA) based on cooperative spectrum sensing relies on a centralized fusion centre to fuse and store the sensing results, which is vulnerable to single point of failure. In this paper, we propose a sensing-based DSA framework which is enabled by blockchain.
Yiyang Pei, Shisheng Hu, Feng Zhong, Dusit Niyato, Ying-Chang Liang   +4 more
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Dynamic spectrum access based on interruptible spectrum leasing

Wireless Networks, 2012
Dynamic spectrum access (DSA) based on interruptible spectrum leasing allows secondary users (SUs) to lease a licensed, but idle, spectrum that is owned by primary users (PUs) on condition that the PUs preempt the access to the leased spectrum. This paper considers a DSA scenario where the SUs opportunistically use the primary spectrum in addition to ...
Im, SY Im, Soo-Yeol, Jeon, H Jeon, Hyoung-Suk, Kim, SH Kim, Seung-Hee, Kim, JU Kim, Jin-Up, Lee, HJ Lee, Hyuck-Jae   +4 more
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Spectrum Management over Dynamic Spectrum Access based HetNets

2019 IEEE International Symposium on Dynamic Spectrum Access Networks (DySPAN), 2019
This paper presents spectrum management in dynamic spectrum access (DSA) based 5G heterogeneous wireless networks (HetNets). Current literature studies architectures and signaling mechanisms for network selection, but rarely discuss proper bandwidth management for users over multiple HetNets.
S. Anand, Vijay P. Kumar, R. Chandramouli   +2 more
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Hybrid spectrum sharing in dynamic spectrum access networks

The International Conference on Information Networking 2013 (ICOIN), 2013
In this work, inefficient spectrum usage problem which will lead to spectrum scarcity in future communications has been addressed. According to Federal Communications Commission, spectrum sharing is a technique to efficiently utilize the spectrum. We analyse dynamic spectrum access concepts such as overlay spectrum sharing and underlay spectrum sharing.
Nair, Sabari Somasekharan, Schellenberg, Sebastian, Seitz, Jochen, Chatterjee, Mainak   +3 more
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Dynamic spectrum access and cognitive radio

2011 2nd International Conference on Wireless Communication, Vehicular Technology, Information Theory and Aerospace & Electronic Systems Technology (Wireless VITAE), 2011
Radio spectrum is natural limited resource, which cannot be owned. Many new technologies are emerging which require spectrum for faster growth. ITU has projected that 1720 MHz spectrum will be required by the year 2020. Several services are knocking the door of telecom market but these promising services cannot be rolled out due to non-availability of ...
P. S. M. Tripathi, Ashok Chandra, Ambuj Kumar, K. Sridhara   +3 more
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Dynamic spectrum access [Guest Editorial]

IEEE Communications Magazine, 2009
The transformation of dynamic spectrum access (DSA) from theory into practice has begun - regulatory decisions such as the recent U.S. FCC "TV White Space Order" embrace DSA, standards bodies have ratified DSA enabling standards, commercial DSA devices are now available, and numerous DSA prototypes, such as DARPA's XG, have been demonstrated.
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Incentivized Cooperative Dynamic Spectrum Access

2015
In the opportunistic spectrum access architecture, secondary users have to vacate from a channel once a primary user signal re-appears on the channel. However, the arbitrary disruption to secondary user communications by primary users results in poor performance for secondary users.
ChunSheng Xin, Min Song
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Dynamic Spectrum Access Techniques: TPC-resilient Initial Access in Open Spectrum Bands

2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008), 2008
Fast frequency channel saturation is one of big challenges in open spectrum bands. System designers may easily come up with TPC (transmission power control) applied to the down-streams of a network, to increase the cell reuse factor, but this scheme alone is likely to encounter initial access issues where beacons are not either receivable or decodable ...
Moonwon Lee, Gwangzeen Ko, Sunmin Lim, Myungsun Song, Changjoo Kim   +4 more
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RDRL: A Recurrent Deep Reinforcement Learning Scheme for Dynamic Spectrum Access in Reconfigurable Wireless Networks

IEEE Transactions on Network Science and Engineering, 2022
Miaojiang Chen, Anfeng Liu, Kaoru Ota
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