Access control policy in wireless networks has a signifcant impact on QoS satisfaction and resource utilization efciency.The design of access control policy in heterogeneous wireless networks(HWNs)becomes more challenging especially for the heterogeneous multiple access protocols of each radio network.In this paper,a Markov model is proposed to analyze the performance of three access control policies for HWNs.The frst policy is the optimal radio access technology(O-RAT)selection,where the incoming trafc always tries to access one network with the maximum service rate before admission.The second policy intends to allocate the same data to all networks.And the trafc will leave the system if it is accomplished frst by one of these networks,which is formulated as the aggregated multi-radio access(A-MRA)technology.The third policy is named the parallel multi-radio access(P-MRA)transmission,in which the incoming trafc is split into diferent networks.The trafc is served with the sum of the service rates provided by overall networks.Numerical and simulate results show the efectiveness of our analytical framework and the performance gain of the three access control policies.As illustrated with some representative results,the P-MRA policy shows superior performance gain to the other two policies independent on the specifc parameters of the diferent multiple access protocols due to the multiplexing gain.
