Ultra-broadband femtocells via opportunistic reuse of multi-operator and multi-service spectrum

Buddhikot, Milind M.; Kennedy, Irwin O.; Mullany, F.J.; Viswanathan, Harish

doi:10.1002/bltj.20340

Cited by 17 publications

(12 citation statements)

References 5 publications

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“…This suggests conservative policy mechanisms that are relaxed over time leading to a slow evolution. In the following, we propose a new architecture called WhiteCells ( Figure 2) [3,5] that helps realize some aspects of the evolution outlined above. In the cellular instantiation of this architecture, LTE RANs are augmented with new type of small cells called whitecell which support multi-band access operating in two types of bands: traditional licensed cellular and shared spectrum bands such as 2-4 GHz S-band radar bands and DTV whitespace bands in 470-700 MHz.…”

Section: Future Wireless Network: a Po-sition Statementmentioning

confidence: 99%

Towards a virtual cellular network with variable grade spectrum

Buddhikot¹

2013

Proceedings of the 19th Annual International Conference on Mobile Computing &Amp; Networking - MobiCom '13

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In this paper, we make a case for future wireless networks that will seamlessly exploit many variable grade spectrum bands. The transformation we envision will be fueled by a fundamental change in the way networks use spectrum. The mix of spectrum options will include existing exclusively licensed and unlicensed bands and new shared spectrum bands where incumbent primary transmitters with interruptible, exclusive access share the band with cooperating (secondary) users. Such bands used in small cell deployments will be key to creating enormous wireless capacity needed to support future traffic demands. The nascent spectrum database technologies will morph into more dynamic spectrum databases and provide essential interference coordination, channel management and monetization. This trend when combined with infrastructure sharing enabled by cloud and SDN technologies will gradually lead to new deployment models. Such network transformation and democratization of spectrum access can fuel innovative business models and new regulatory regimes for wireless networks.We illustrate the new architecture and component radio, database and security technologies using concrete example of incorporating shared spectrum in a small cell network.

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Section: Future Wireless Network: a Po-sition Statementmentioning

confidence: 99%

Towards a virtual cellular network with variable grade spectrum

Buddhikot¹

2013

Proceedings of the 19th Annual International Conference on Mobile Computing &Amp; Networking - MobiCom '13

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“…Sankaranarayanan et al [23] propose reusing timeslots in a GSM cell for adhoc networks during periods when the GSM cell is lightly utilized. Buddhikot et al [6] describe a system for indoor femtocells to dynamically share spectrum with incumbent carriers by operating over ultra wide bands. Yin et al [33] proposes a similar system and provides measurement results which indicate that unused spectrum (i.e., whitespace) exists even in a dense, urban environment (Beijing).…”

Section: Cognitive Radiomentioning

confidence: 99%

“…We ran the system for testing for one week before we began collecting data, which we did from October 22 through November 1, 2013. 6 As stated before, we used two independent software radios for dual-ARFCN operation. This was solely due to time constraints, and we stress that there is no fundamental reason our approach requires two radios: although implementing support for multiple channels on a single radio would require more engineering effort, it's within the hardware capabilities of existing software radios.…”

Section: A Implementationmentioning

confidence: 99%

GSM whitespaces: An opportunity for rural cellular service

Hasan

Heimerl

Harrison

et al. 2014

2014 IEEE International Symposium on Dynamic Spectrum Access Networks (DYSPAN)

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Abstract-The GSM network is the largest network on Earth, providing vital communications service to billions of people. Yet hundreds of millions of people live outside coverage of existing cellular providers. Recently, researchers have demonstrated a new model of cellular connectivity, community cellular, that has the potential to bring coverage to extremely rural populations. Although the total capital costs for these networks (

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“…Second, while the ultrabroadband cellular technology such as 3rd Generation Partnership Project (3GPP) Long-Term Evolution-Advanced (LTE-Advanced) requires up to 100 MHz per channel [15], the amount of wideband spectrum is limited. The CR technology enables bandwidth aggregation by sharing spectrum owned by other cellular operators, or opportunistically utilizing unused spectrum bands licensed to other services such as digital TV, and public safety [16]. Finally, in the current cellular networks, the base station (BS) has only an RF unit, and a digital unit for all communication functionalities is implemented in a separate central server [17].…”

Section: Proposed Network Architecturementioning

confidence: 99%

Spectrum-Aware Mobility Management in Cognitive Radio Cellular Networks

Lee

Akyildiz

2012

IEEE Trans. on Mobile Comput.

123

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Abstract-Cognitive radio (CR) networks have been proposed as a solution to both spectrum inefficiency and spectrum scarcity problems. However, they face several challenges based on the fluctuating nature of the available spectrum, making it more difficult to support seamless communications, especially in CR cellular networks. In this paper, a spectrum-aware mobility management scheme is proposed for CR cellular networks. First, a novel network architecture is introduced to mitigate heterogeneous spectrum availability. Based on this architecture, a unified mobility management framework is developed to support diverse mobility events in CR networks, which consists of spectrum mobility management, user mobility management, and intercell resource allocation. The spectrum mobility management scheme determines a target cell and spectrum band for CR users adaptively dependent on time-varying spectrum opportunities, leading to increase in cell capacity. In the user mobility management scheme, a mobile user selects a proper handoff mechanism so as to minimize a switching latency at the cell boundary by considering spatially heterogeneous spectrum availability. Intercell resource allocation helps to improve the performance of both mobility management schemes by efficiently sharing spectrum resources with multiple cells. Simulation results show that the proposed method can achieve better performance than conventional handoff schemes in terms of both cell capacity as well as mobility support in communications.Index Terms-Cognitive radio, spectrum pool, handoff, intercell resource allocation, spectrum mobility management, user mobility management.

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Ultra-broadband femtocells via opportunistic reuse of multi-operator and multi-service spectrum

Cited by 17 publications

References 5 publications

Towards a virtual cellular network with variable grade spectrum

Towards a virtual cellular network with variable grade spectrum

GSM whitespaces: An opportunity for rural cellular service

Spectrum-Aware Mobility Management in Cognitive Radio Cellular Networks

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