Computer Science – Networking and Internet Architecture
Scientific paper
2008-10-21
Computer Science
Networking and Internet Architecture
29 pages, 10 figures, Revised and resubmitted to the IEEE Transactions on Wireless Communications
Scientific paper
In a two tier cellular network -- comprised of a central macrocell underlaid with shorter range femtocell hotspots -- cross-tier interference limits overall capacity with universal frequency reuse. To quantify near-far effects with universal frequency reuse, this paper derives a fundamental relation providing the largest feasible cellular Signal-to-Interference-Plus-Noise Ratio (SINR), given any set of feasible femtocell SINRs. We provide a link budget analysis which enables simple and accurate performance insights in a two-tier network. A distributed utility-based SINR adaptation at femtocells is proposed in order to alleviate cross-tier interference at the macrocell from cochannel femtocells. The Foschini-Miljanic (FM) algorithm is a special case of the adaptation. Each femtocell maximizes their individual utility consisting of a SINR based reward less an incurred cost (interference to the macrocell). Numerical results show greater than 30% improvement in mean femtocell SINRs relative to FM. In the event that cross-tier interference prevents a cellular user from obtaining its SINR target, an algorithm is proposed that reduces transmission powers of the strongest femtocell interferers. The algorithm ensures that a cellular user achieves its SINR target even with 100 femtocells/cell-site, and requires a worst case SINR reduction of only 16% at femtocells. These results motivate design of power control schemes requiring minimal network overhead in two-tier networks with shared spectrum.
Andrews Jeffrey G.
Chandrasekhar Vikram
Gatherer Alan
Muharemovic Tarik
Shen Zukang
No associations
LandOfFree
Power Control in Two-Tier Femtocell Networks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Power Control in Two-Tier Femtocell Networks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power Control in Two-Tier Femtocell Networks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-573725