Research Article
Investigation on Mutual Contention Bandwidth Request Mechanisms in Two-Hop Relay Network with ITU-R Path Loss Models
Table 2
Simulation parameters.
| Parameters | Details |
| Multiple access | OFDMA | Duplexing | TDD | Frequency (GHz) | 5.8 | Frame duration (ms) | 5 | Symbol duration (us) | 100.8 | Number of subcarriers | 2048 | Number of subchannels | 70 | Usage mode | PUSC | Uplink subframe size (symbols) | 12 | Number of BS/RS/MS | 1/3/75 | BS coverage (km) | 5 | RS coverage (m) | 300 | Maximum hops | 2 | Pathloss model | Suburban fixed, vehicular, or outdoor to indoor and pedestrian | Multipath channel model | ITU Channel A | Ranging power step (mW) | 0.25 | Bandwidth request backoff start | 2 | Bandwidth request backoff end | 4 | Reservation timeout (contention) | 16 | Request retries | 16 | Application | Best effort (FTP and HTTP) | Efficiency mode | Physical layer enabled | Simulation platform | OPNET 14.5 |
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