摘要
IEEE 802.11p has been proposed to extend the application of IEEE 802.11 to Wireless Access fast fading Vehicular Environments (WAVE).Due to the high velocities of vehicles and thus the inconstant topology of networks,it is extremely difficult to maintain communications without handoff in an Internet of Vehicles (IoV).Hence,fast handoff from one roadside unit (RSU) to another is necessary.Although some solutions have been given in IEEE 802.11r and 802.11f standards,the handoff latency is still as high as about 50 ms when adopting them.To address this issue in WAVE systems,a novel position-based handoff (PHO) scheme is proposed in this paper.In PHO scheme,the triggering of the handoff is accomplished by the location information of a vehicle instead of the power level of the received signal.Both the handoff process and latency of PHO scheme are analyzed.Finally,to verify the analytical results,simulations were conducted to date the effectiveness of the proposed PHO scheme.
IEEE 802.1 1p has been proposed to extend the application of IEEE 802.11 to Wireless Access fast fading Vehicular Environments （WAVE）. Due to the high velocities of vehicles and thus the inconstant topology of networks, it is extremely dif- ficult to maintain communications without handoff in an Internet of Vehicles （IoV）. Hence, fast hand- off from one roadside unit （RSU） to another is necessary. Although some solutions have been given in IEEE 802.11 r and 802.11 f standards, the handoff latency is still as high as about 50 ms when adopting them. To address this issue in WAVE systems, a novel position-based handoff （PHO） scheme is pro- posed in this paper. In PHO scheme, the triggering of the handoff is accomplished by the location in- formation of a vehicle instead of the power level of the received signal. Both the handoff process and latency of PHO scheme are analyzed. Finally, to verify the analytical results, simulations were conducted to date the effectiveness of the proposed PHO scheme.
基金
supported in part by National Natural Science Foundation of China(Grant Nos.60971082,60872049,60972073,and60871042)
National Key Basic Research Program of China(Grant No.2009CB320407)
National Great Science Specific Project(Grant No.2009ZX03003-001,2009ZX03003-011,2010ZX03001003)
Chinese Universities Scientific Fund,China
