The slot allocation is one of the key technologies in IEEE802.16 mesh networks.This paper proposes a diffserv-based slot allocation mechanism (DSSA).At first

we adjust the start time of scheduling window

in order to optimize the number of the scheduled tasks.Then

we assign different search scopes with scheduling window

in accordance with the type of tasks

with an objective to achieve slot reservation that satisfies the requirement in delay of real-time tasks.Finally

DSSA records the arrival rates of tasks periodically

which is used to predict the number of arriving tasks.We can adjust the number of reserved slots according to the predicted value.Our simulation results demonstrate that

DSSA can efficiently enhance the scheduling efficiency of the real-time tasks

while satisfying the requirement in slot allocation of non-real-time tasks.