Constructions of control sequence set for hierarchical access in data link network

As an important resource in data link, time slots should be strategically allocated to enhance transmission efficiency and resist eavesdropping, especially considering the tremendous increase in the number of nodes and diverse communication needs. It is crucial to design control sequences with robust randomness and conflict-freeness to properly address differentiated access control in data link. In this paper, we propose a hierarchical access control scheme based on control sequences to achieve high utilization of time slots and differentiated access control. A theoretical bound of the hierarchical control sequence set is derived to characterize the constraints on the parameters of the sequence set. Moreover, two classes of optimal hierarchical control sequence sets satisfying the theoretical bound are constructed, both of which enable the scheme to achieve maximum utilization of time slots. Compared with the fixed time slot allocation scheme, our scheme reduces the symbol error rate by up to 9%, which indicates a significant improvement in anti-interference and eavesdropping capabilities.