Voice/Data Capacities in HSDPA

A. Rajesh Kumar, M. Anoop, D. Jayaram, and A. Chockalingam (India)

Keywords

HSDPA, UMTS, VoIP, mixedtraffic, sch eduling, capacities of voice and data.

Abstract

High Speed Downlink Packet Access (HSDPA), an ad vanced shared channel technology on the downlink in UMTS, developed primarily for improved system through put in non-real time packet data application scenarios, are increasingly being considered to carry mixed traffic includ ing voice over IP (VoIP). The primary objective in this paper is to evaluate the HSDPA system performance in a mixed voice/data traffic scenario. The resources (slots) for voice and data traffic are alloted based on a moving bound ary in a frame of slots. During a slot alloted for voice traffic, multiple VoIP users are code-multiplexed, and in slots alloted for data traffic, two scheduling strategies are considered for assignment of slots to different data users, namely, ¥§¦ round robin (RR) strategy, and ¥¨¥§¦ minimum power (MP) strategy, where the user with the highest chan nel quality indicator (CQI) value in a slot gets that slot. We present the performance results in terms of voice and data capacities (in terms of number of users for voice, and throughput/delay performance for data), obtained through extensive simulations that we carried out using EURANE (Enhanced UMTS Radio Access Network Extension) for network simulator (© -2).

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