Aeronautical short messages preempting transmission based on resource discrete distribution

In order to guarantee the real-time performance of aeronautical short message (ASM) service, which is considered as one of kernel services in 4 dimensional trajectory data link (4DTRAD), in this paper, a preempting strategy is proposed for hybrid services including both ASM and stream data. Based on the preempting strategy, a burst ASM (time delay sensitive) can preempt the nearest time slot, which has already been allocated to a stream service (time delay tolerable) from the same aircraft. To ensure time slots allocated to stream service evenly located in time domain, an inverted order binary-tree mapping (IOBM) algorithm is further studied to improve the real time performance of ASM and steam services simultaneously. Numerical results illustrate that, with the proposed strategy, time delay is significantly reduced and signaling overheads can be saved for efficient ASM transmission.