In massive machine type communication (MTC)

when a large number of devices flood into the LTE-A (long term evolution-advanced) network in a short period of time

and simultaneously initiated random access attempt

which will cause serious network congestion. Appropriate measures need to be taken to control the congestion.Therefore

this paper proposes a congestion control scheme based on a sliding window. The size of the window controls the number of devices that simultaneously initiate attempts to reduce the collision probability between devices

which can effectively improve the success rate of system access and alleviate network congestion. In different load scenarios

the proposed scheme is compared with the receiving performance of the static ACB (access class barring) strategy and the dynamic ACB strategy. The simulation results show that the scheme proposed here can achieve access success rate close to 100%

while reduces the minimum average reception delay and overall system service time.