Coexistence Analysis of D2D-Unlicensed and Wi-Fi Communications

Table 1

Parameter settings.

Parameters	Settings
Path loss model
Transmission power	24 dBm
Noise power	-95 dBm
Distance of D2D-U users	50 m
Channel bandwidth	20 MHz
D2D-U maximum backoff window size	32
Packet size	8,224 bits
Wi-Fi bit rate	130 Mbps
Wi-Fi minimum backoff window size	16
Wi-Fi maximum backoff times	6
Physical layer header size	192 bits
MAC layer header size	224 bits
Time slot duration	9 μs
Channel idle time	20 μs
Wi-Fi SIFS time	16 μs
Wi-Fi DIFS time	50 μs