Abstract:

In order to maintain users’smooth connection to satellites during frequent handovers in LEO ( Low Earth Orbit) satellite networks with multi-class traffic,an adaptive probability-based bandwidth reservation strategy ( APRS) is proposed. Based on the deterministic and predictive features of the movement of mobile users APRS reserves the bandwidth without full amount for coming handovers and according to the handover probability of mobile users and adaptively adjusts its reservation according to the current network condition. Moreover,the implementation methods of APRS in multi-class traffic environment are proposed,and the effectiveness of it is verified via simulation. The results indicate that APRS can reserve and allocate appropriate bandwidth for users in multi-class traffic environment,provide users with satisfactory quality of service ( QoS) and increase the bandwidth utilization.

Key words: LEO satellite network, handover management, bandwidth reservation, quality of service