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Hierarchical cell structure (HCS) has become a major trend in the design of 3G systems networks in order to support the high capacity demand required for multimedia traffic in 3G systems. In this type of network an efficient cell assignment scheme is required to improve the quality of service (QoS) of the system in terms of dropping probability, blocking probability, and channel utilisation. In this paper we propose a new channel assignment scheme which exploits the delay insensitive property of the non real-time data service to admit users to the preferred cell layer. We believe the new scheme is anticipated to improve the QoS of the realtime voice users for both blocking probability and channel utilisation parameters.