Abstract
AbstractQuality of service (QoS) at the call or flow level in Time Division Code Division Multiple Access (TD‐CDMA) networks is an important topic that has not yet received much attention. In this paper, we propose a two‐tier admission and scheduling policy. The scheduling policy is comprised of two procedures, the User Prioritizer Procedure (UPP) and Packet Allocator Procedure (PAP). The UPP is used to determine the serving priority of users. The task of PAP is to allocate packets to a time slot without violating the outage probability by invoking the tier 1 and tier 2 admission control. The tier 1 admission keeps the probability of violating the Bit Error Rate (BER) limits for new call arrivals below a specified threshold. The tier 1 admission allocates bandwidth for newly arrived calls on the basis of the outage probability threshold. The tier 2 admission reserves bandwidth in all surrounding sectors for future handoff events, which minimizes the probability that the handoff call from one sector will cause an outage condition in the target sector. The performance of the proposed policy is evaluated through simulations in the presence of voice and data traffic types. We show that the proposed scheme can provide satisfactory quality for a call or data flow during its lifetime. Copyright © 2003 John Wiley & Sons, Ltd.
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