Wednesday, 23 July 2014

Enabling Spectrum Sharing in Secondary Market Auctions

Wireless spectrum is a scare resource, but in practice much of it is under-used by current owners. To enable better use of this spectrum, we propose an auction approach to dynamically allocate the spectrum in a secondary market. Unlike previous auction approaches, we seek to take advantage of the ability to share spectrum among some bidders while respecting the needs of others for exclusive use. Thus, unlike unlicensed spectrum (e.g. Wi-Fi), which can be shared by any device, and exclusive-use licensed spectrum, where sharing is precluded, we enable efficient allocation by supporting sharing alongside quality-of-service protections. We present SATYA (Sanskrit for “truth”), a strategy proof and scalable spectrum auction algorithm whose primary contribution is in the allocation of a right to contend for spectrum to both sharers and exclusive-use bidders. We demonstrate SATYA’s ability to handle heterogeneous agent types involving different transmit powers and spectrum needs through extensive simulations.
 Many researchers and companies have proposed allowing spectrum owners and spectrum users to participate in a secondary market for spectrum where users are allocated the use of spectrum in a small area on a dynamic basis based on their short- or medium-term needs. This approach is beneficial for two reasons. First, it allows flexible approaches to determining how best to allocate spectrum rather than relying on the decision making of regulators like the FCC in the United States. Second, it provides an incentive for spectrum that is currently owned but unused or under-used to be made available by its owners. Note, by secondary market we mean, one in which the owner of a chunk of spectrum leases different frequencies to other users who bid for the spectrum. The FCC has also recognized the potential use of a secondary spectrum market and has begun encouraging spectrum owners in certain bands to sublease the spectrum.
·       Possibilities for sharing in secondary spectrum market have not been sufficiently explored.
·       Devices like wireless microphones are only use occasionally, so even if they require exclusive access while in use, some other device may be able to use the same spectrum on a secondary basis when they are not.

We present SATYA, a scalable auction-based algorithm that permits different classes of spectrum users (sharing and exclusive) to co-exist and share the spectrum whenever desirable while appropriately accounting for the resulting externalities. While SATYA relies on the MAC to arbitrate access to the spectrum, the precise set of contending nodes is decided based on the outcome of the auction. SATYA uses a simple, yet expressive, language to allow bidders to express their value for different allocations given probabilistic activation patterns, interference, and different requirements for shared vs exclusive-access spectrum. This kind of expressiveness is necessary to enable the efficient allocation of short-term spectrum rights to multiple devices. To evaluate SATYA we use real world data sources to determine participants in the auction, along with the sophisticated Longley-Rice propagation model and high resolution terrain information to generate conflict graphs. We compare the performance of SATYA against other auction algorithms and baseline computations. We also demonstrate how reserve prices can be used to increase the revenue of spectrum auctions, an important consideration when trying to encourage spectrum owners to participate.
·       It is optimal for a bidder to reveal his true valuation when bidding.
·       It enables a tractable, strategy proof auction despite externalities.
·       It demonstrates how reserve prices can be used to increase the revenue of spectrum auctions.



ü Processor                  -        Pentium –IV

ü Speed                        -        1.1 Ghz
ü RAM                         -        512 MB(min)
ü Hard Disk                 -        40 GB
ü Key Board                -        Standard Windows Keyboard
ü Mouse                       -        Two or Three Button Mouse
ü Monitor                     -        LCD/LED


         Operating system :         Windows XP
         Coding Language :         Java
         Data Base             :         MySQL
         Tool                     :         Net Beans IDE


 Ian A. Kash, Rohan Murty, and David C. Parkes, Enabling Spectrum Sharing in Secondary Market Auctions IEEE TRANSACTIONS ON MOBILE COMPUTING, Volume:13 ,  Issue: 3 , MARCH 2014.

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