In heterogeneous 5th generation network

a robust vertical handoff algorithm based on interval mark decision is proposed to solve the problem of low handoff accuracy

which is caused by poor robustness of current vertical handoff algorithms. Firstly

the median average filter method is employed to obtain more accurate network attribute values. Secondly

based on parameter fluctuation characteristic analysis

an interval mark decision algorithm is proposed to ensure the pass rate and accuracy of candidate network screening

moreover

the robustness of the handoff process is also effectively improved. Thirdly

according to the transmission layer requirements and motion trend of the mobile terminals

the optimum target network is obtained by using utility functions with different weights. Finally

the simulations show that the proposed algorithm can effectively improve the accuracy of handoff triggering and network screening while reducing the failed handoff and the ping-pong effect. Not only that

the total network throughput is also improved. Meanwhile

it chooses the best target network according to the requirements of mobile terminals.