White space networking with wi-fi like connectivity

Abstract

Networking over UHF white spaces is fundamentally different from conventional Wi-Fi along three axes: spatial variation, temporal variation, and fragmentation of the UHF spectrum. Each of these differences gives rise to new challenges for implementing a wireless network in this band. We present the design and implementation of Net7, the first Wi-Fi like system constructed on top of UHF white spaces. Net7 incorporates a new adaptive spectrum assignment algorithm to handle spectrum variation and fragmentation, and proposes a low overhead protocol to handle temporal variation. builds on a simple technique, called SIFT, that reduces the time to detect transmissions in variable channel width systems by analyzing raw signals in the time domain. We provide an extensive evaluation of the system in terms of a prototype implementation and detailed experimental and simulation results.

Wireless Network Pricing

“…4.7, we show the user-provider association at the equilibrium for a particular realization of channel gains, where the thickness of the link indicates the amount of resources purchased. The users are labeled by numbers (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20), and the providers are labeled by letters (a-e). This figure shows two users (12 and 16) requesting resources from multiple service providers, and that certain users (1,7,13, and 8) do not purchase any resource at equilibrium.…”

“…For example, the Federal Communications Commission (FCC) in the US has recently decided to open up the TV spectrum for unlicensed use, as long as the licensed users' communications are protected. Microsoft has already built a testbed over its Redmond campus to demonstrate the practicality of such sharing [3].…”

“…• If Operator i has limited resource i.e., B i < D i p i , p j : since operator i cannot satisfy the Preferred Demand, some demand will be satisfied by operator j if it has enough resource. Since the realized demand 3 The remaining users want to purchase bandwidth from operator j with a total demand of (G − B i exp(1 + p i )) exp(− 1 + p j ). Thus, the Realized Demands are To calculate the investment equilibria of Game 6.27, we can first calculate operator i's best response given operator j 's (not necessarily equilibrium) investment decision, i.e.,…”

Achieving single channel, full duplex wireless communication

“…In cognitive radio technologies such as WhiteFi [2], the unlicensed (secondary) users are allowed to use a spectrum only if the licensed (primary) users are not using it. One of the primary challenges in such systems is to identify when it is okay for secondary users to use the spectrum.…”

Whitespace Networks Relying on Dynamic Control Channels

“…Realization of these scenarios will require a certain level of control and coordination between cognitive radio devices; in other words, the formation of a network. In [7] networks over TVWS are formed based on an enriched WiFi protocol and spectrum availability information determined based on local spectrum sensing. The latter, however, does not conform to the subsequent decisions made by the regulators to mandate geo-location databases as a means for protection of incumbent services.…”