Abstract-The advantages of code division multiple access (CDMA) for cellular voice have become well known, and IS-95-based systems have now been widely deployed. Attention is now focused on higher data-rate packet services for cellular systems. Although many packet multiple access schemes have been studied over the years, researchers have often studied single cell performance and ignored reuse. Moreover, direct sequence spread spectrum (DSSS) has been considered unsuitable for high data-rate packet multiple access since spreading limits the permitted data rates, DSSS requires large overhead (preambles) for acquisition and requires closed-loop power control.In this paper, we describe a scheme for high data-rate packet service using CDMA that addresses all of the above problems and has been standardized in Revision B of IS-95. A low rate fundamental code channel is maintained that eliminates the need for long preamble and provides closed-loop power control. Reuse is managed by the infrastructure through a "burst-level" admission control based on load and interference-level measurements at the base stations and mobiles.We report on the feasibility of such a burst-mode packet data service for cellular CDMA networks. The focus is not only on the performance of high data-rate users, but also on the impact on voice users sharing the CDMA band. We propose a multitiered performance analysis methodology consisting of a mix of static simulations, dynamic simulations at different time scales, and analytic methods to address the various feasibility issues: impact on coverage; capacity; power control; and effectiveness of burst admission algorithms. We expect that detailed performance work on all aspects discussed in this paper will continue in the future. However, based on the current study, we can conclude that the proposed approach is well suited for third-generation wideband CDMA systems being considered for standardization throughout the world.Index Terms-Burst admission, CDMA packet data, high datarate services, load and interference-based dynamic assignment (LIDA), wireless data.
In this work, we study a simple admission control scheme for high speed packet data service Over the reverse link: of an IS-95 based CDMA air interface. A preliminary version of this scheme was originally proposed in 131 and admits data users On a burst level. I n this work, we study the performance and design tradeofis through simulations. The basic tradeof is the coverage of high speed packet data service and its impact on outage experienced by the tributed high data rate users in a cellular environment share the cellular CDMA band with conventional mobile cellular voice and circuit-mode data users. Burst admission schemes can be designed USing:1. The load information in the cell and its neighbors?
The pilot strength measurements provided bythe mobile, and voice users. The results indicate that through limiting the region where high speed data service is available, the performance impact on voice users can be 3. Coordination of the burst rate, burst length and burst starting time between neighbor cells. made small, It is possible to extend the region of coverage of high speed data by using more complex schemes proposed in [3]. These schemes are subject of future work.
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