Speech traffic capacity of idle-signal casting multiple access with collision detection (ICMA/CD) for cellular mobile radio

Describes the characteristics of a possible candidate for the radio sub-system in the UMTS known as idle-signal casting multiple access with collision detection (ICMA/CD). This is primarily a random access technique initially designed for data transmission which is a development of the CSMA/CD access technique. A significant difference between the LAN and radio environment is that in the latter case mobiles are unable to monitor other mobile transmissions because of the `hidden user problem´. Consequently ICMA/CD makes use of the base station to detect and resolve packet collisions. The performance of ICMA/CD for voice traffic in a realistic cellular environment is considered