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Downlink capacity of two-tier cognitive femto networks | IEEE Conference Publication | IEEE Xplore

Downlink capacity of two-tier cognitive femto networks


Abstract:

In two-tier networks consisting of a macrocell overlaid with femtocells in co-channel deployment and closed-access policy, spatial reuse is achieved at the price of sever...Show More

Abstract:

In two-tier networks consisting of a macrocell overlaid with femtocells in co-channel deployment and closed-access policy, spatial reuse is achieved at the price of severe cross-tier interference from concurrent transmissions. The lack of direct coordination between the macro and femtocells makes interference control as a challenging issue. Cognitive radio (CR) becomes a promising solution, where femtocells with cognitive information accomplish concurrent transmissions while meeting a per-tier outage constraint. Several interference-aware allocation approaches are proposed to enhance spatial reuse according to cognitive capabilities of femtocell. By employing stochastic geometry model, bounds on the distribution of aggregated interference from two-tier spatial point processes are successfully analyzed. The maximum number of simultaneously transmitting femtocells and overall downlink capacity of two-tier networks meeting a per-tier outage requirement in each approach are theoretically derived. This paper proves that with stronger cognitive capability (i.e., more knowledge interpreted) at femtocell, more spatial reuse gain can be found.
Date of Conference: 26-30 September 2010
Date Added to IEEE Xplore: 17 December 2010
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Conference Location: Istanbul, Turkey

References

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