QoS requirement real and non real time calls assignment for multi-rate MC-DS-CDMA to locate vacant code

The paper a scheme is recommended for incoming calls to mobile network which allocates the real time (voice, multimedia, video etc.) and non real time (data) calls differently. The calls are differentiated by their quality of service (QoS) requirements. It is used in the downlink of multi-rate MC-DS-CDMA. The real-non real (R-NR) scheme assigns on arrival of new call assigns a vacant code which introduces minimum future blocking of codes or calls. The algorithm first differentiates calls on the basis of their type and then assigns call to a vacant code which utilizes capacity of previously block codes or a vacant code which leads to minimum future blocking of codes. The R-NR scheme also checks channel load (Cl) before assignment and ensures Cl<;Cl_Th. Performance analysis is done with the help of simulations and verify the improvement in code blocking probability when compared with other schemes in already available in literature for different traffic distribution.