A Novel WLAN Roaming Decision and Selection Scheme for Mobile Data Offloading

Table 1

Simulation parameter.

WiMAX		WiFi
Technology	IEEE 802.16e	IEEE 802.11a
Coverage	1000 m	50 m
RX Thresh	−96 dBm	−82 dBm
Transmitting power	35 dBm	16.02 dBm
Bandwidth/QoS	5 Mb/s	9 Mb/s
Modulation scheme	OFDM 16QAM	OFDM 16QAM
Carrier frequency	2.3 GHz	5 GHz
channelUtilizationBeaconIntervals	NA	10
BS number	2	3
Propagation channel	Two-ray ground	Two-ray ground
Channel load threshold	NA	0.8
MS
Node number		4
Mobility movement		Straight line
Multiple interface		WiMAX and WiFi
Speed		2–5 m/s
Traffic parameter		Greedy CBR
Miscellaneous
Channel load broadcast interval		100 ms
		0.4
		0.6
		0.5