Uplink Capacity and Interference Avoidance for Two-Tier Femtocell Networks
| dc.creator | Chandrasekhar, Vikram | |
| dc.creator | Andrews, Jeffrey G. | |
| dc.date | 2007-02-23 | |
| dc.date | 2009-02-05 | |
| dc.date.accessioned | 2026-07-07T12:37:56Z | |
| dc.date.available | 2026-07-07T12:37:56Z | |
| dc.description | Two-tier femtocell networks-- comprising a conventional macrocellular network plus embedded femtocell hotspots-- offer an economically viable solution to achieving high cellular user capacity and improved coverage. With universal frequency reuse and DS-CDMA transmission however, the ensuing cross-tier cochannel interference (CCI) causes unacceptable outage probability. This paper develops an uplink capacity analysis and interference avoidance strategy in such a two-tier CDMA network. We evaluate a network-wide area spectral efficiency metric called the \emph{operating contour (OC)} defined as the feasible combinations of the average number of active macrocell users and femtocell base stations (BS) per cell-site that satisfy a target outage constraint. The capacity analysis provides an accurate characterization of the uplink outage probability, accounting for power control, path-loss and shadowing effects. Considering worst case CCI at a corner femtocell, results reveal that interference avoidance through a time-hopped CDMA physical layer and sectorized antennas allows about a 7x higher femtocell density, relative to a split spectrum two-tier network with omnidirectional femtocell antennas. A femtocell exclusion region and a tier selection based handoff policy offers modest improvements in the OCs. These results provide guidelines for the design of robust shared spectrum two-tier networks. | |
| dc.description | To be published in the IEEE Transactions on Wireless Communications | |
| dc.identifier | https://arxiv.org/abs/cs/0702132 | |
| dc.identifier | http://arxiv.org/abs/cs/0702132 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/218585 | |
| dc.subject | Networking and Internet Architecture | |
| dc.subject | Information Theory | |
| dc.title | Uplink Capacity and Interference Avoidance for Two-Tier Femtocell Networks | |
| dc.type | text |