The paper presents a novel channel assignment scheme

namely classified compact dynamic channel assignment (CCDCA) scheme for cellular mobile communications systems.The so-called classification is that a cell is classified as the hot and cold based on the definition of "cold" and "hot".The so-called CCDCA is that different compact strategies and allocation are thus derived

then the information obtained from the previous "cold" state is used for channel assignment in the "hot" state.The scheme combines local information with the whole

and can guarantee high quality of service (QoS) and low service deviation (SD).A two-dimensional Markov chain model is developed to analyze the threshold and its main parameters are derived for the scheme

though it is also applicable to analyze channel assignment schemes.By simulation

the CCDCA is shown to be superior in terms of call blocking probability and spectrum utilization.The simulation also shows that the model can match practical system quite well.