Research and Application of Dual-NIC Soft Handoff Scheme in Subway Wireless System
Mobile Mode performs a handoff whenever it moves out of the range of one access point and tries to connect to another one.The delay and losing packets caused by handoff process affect the network QoS.Taking subway wireless communication system as an application scenario,MN was settled double wireless NICs,which are controlled work together to complete data transmission and handoff.The result shows that this scheme can decrease the scan delay effectively,and the packet loss rate can reduced to zero in specific environment,and the extra delay to the network is tolerable.This handoff scheme has been applied to the pre-research project of subway signal systems.