Table 1 Notation and simulation values
From: Open, closed, and shared access femtocells in the downlink
Symbol | Description | Sim. value |
|---|---|---|
| Indoor area covered by the FAP at D > D th (a disc with the radius R i ) | N/A |
| Outdoor area covered by the FAP at D > D th in open access or | Â |
| Â | covered by the MBS in closed access | N/A |
| Â | (a circular annulus with inner radius R i and outer radius R f ) | Â |
| Indoor area covered by the FAP at D ≤ D th (a disc with the radius R f ) | N/A |
| Indoor area covered by the MBS (a circular annulus with inner radius R f | N/A |
|  | and outer radius R i with respect to the FAP at D ≤ D th ) |  |
D | Distance between FAP and central MBS | Not fixed |
D th | Threshold distance (Radius of inner region) | Not fixed |
D c | Distance between central MBS and homeuser (or neighboring cellular user) | Not fixed |
R | Distance between FAP and homeuser (or neighboring cellular user) | Not fixed |
R f | Femtocell radius | Not fixed |
R c | Macrocell radius | 500 m |
R i | Indoor (home) area radius | 20 m |
P c | Transmit power at macrocell | 43 dBm[29] |
P f | Transmit power at femtocell | 13 dBm[29] |
α | Outdoor path loss exponent | 4 |
β | Indoor path loss exponent | 4 |
L | Wall penetration loss | 0.5 (−3 dB) |
G n | Shannon gap | 3 dB |
N | Number of discrete levels for M-ary modulation (M-QAM) | 8 |
Ω c | Required minimum throughput of cellular user for hybrid access | 0.01 bps/Hz |
Ω h | Required minimum throughput of home user for hybrid access | 0.1 bps/Hz |