Erlang capacity for an integrated voice/data DS-CDMA wireless system with variable bit rate sources

Mandayam, Narayan B.; Holtzman, J.M.; Barberis, Sergio Daniel

doi:10.1109/pimrc.1995.477314

Cited by 24 publications

(6 citation statements)

References 12 publications

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“…The number of packets transmitted to the channel per unit time is equal to the number of total transmissions of packets that gained service (20) The birth rate for actually transmitted packets can then be computed from (19) and (20). The probability that the packet is transmitted successfully from the first bit to the th bit with interfering packets on the th bit is if (21) For (22) Here, we assume that the channel load is constant during one bit duration and that the number of interfering packets can change at most by 1 between the consecutive bits (22). In Section III, we show via simulation that this assumption is valid for different arrival processes given that transmission rate is high enough.…”

Section: B System Analysismentioning

confidence: 99%

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An Analytical Framework for the Design and Performance Evaluation of Realistic Aloha-CDMA Systems

Ozer

Papavassiliou

2004

IEEE Trans. Wireless Commun.

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The random access scheme has been shown to be an efficient transfer mechanism of packet data in wireless environments for nonreal-time applications where messages with variable length are transmitted over power controlled code-division multiple-access (CDMA) channels. Most of the previous work in this area covered the analysis of the CDMA systems for fixed or exponential packet length, infinite population, and unlimited waiting and service time where the results mainly depend on the mean values of the traffic. In this paper, we remove these assumptions and analyze the behavior of the system for the more general and realistic case of finite population, finite sojourn time, and general packet length distribution. Specifically, we provide an analytical method to study the performance related parameters of the system, such as packet delay, packet loss, and throughput as well as the effect of packet length distribution on the system performance under a realistic environment. The obtained results demonstrate that for the packet length distributions with the same mean but different tail properties, the system behavior can change dramatically. In addition, we demonstrate that this study provides an analytical tool that can be used as the underlying framework for the support of a wide range of applications and management functions such as optimization of design parameters, integration of multimedia services, and anomaly detection in CDMA wireless networks.Index Terms-Aloha, code-division multiple access (CDMA), heavy-tailed packet length, random access, wireless networks.

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Section: B System Analysismentioning

confidence: 99%

“…For (37) SNR and BER can be computed by using (23)- (26). In case of multiple classes, e.g., voice and data, if power levels are independent random variables, mean and variance of is expressed as [21] (38) (39)…”

Section: B Performance Analysis Of Integrated Servicesmentioning

confidence: 99%

An Analytical Framework for the Design and Performance Evaluation of Realistic Aloha-CDMA Systems

Ozer

Papavassiliou

2004

IEEE Trans. Wireless Commun.

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“…Additional work on access protocols for integrating voice and data traffic in DS-CDMA is presented in [14], [15], and [16]. This latter work, in addition to [11] and [17], models all data traffic as a single stochastic arrival process.…”

Section: A Related Workmentioning

confidence: 99%

“…That is, when is chosen to minimize average delay, the associated SINR is independent of the number of users . Combining (12) and (15) gives (16) where is the solution to (15) for given , and . We therefore conclude that the optimal processing gain increases linearly with the number of active users.…”

Section: A Continuously Active Usersmentioning

confidence: 99%

Resource allocation for multiple classes of DS-CDMA traffic

Kim

Honig

2000

IEEE Trans. Veh. Technol.

103

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We consider a packet data direct-sequence code-division multiple-access (DS-CDMA) system which supports integrated services. The services are partitioned into different traffic classes according to information rate (bandwidth) and quality of service (QoS) requirements. Given sufficient bandwidth, QoS requirements can be satisfied by an appropriate assignment of transmitted power and processing gain to users in each class. The effect of this assignment is analyzed for both a single class of data users and two classes of voice and data users. For a single class of data users, we examine the relationship between average delay and processing gain, assuming that ARQ with forward error correction is used to guarantee reliability. The only channel impairment considered is interference, which is modeled as Gaussian noise. A fixed user population is assumed and two models for generation of data packets are considered: 1) each user generates a new packet as soon as the preceding packet is successfully delivered and 2) each user generates packets according to a Poisson process. In each case, the packets enter a buffer which is emptied at the symbol rate. For the second traffic model, lowering the processing gain below a threshold can produce multiple operating points, one of which corresponds to infinite delay. The choice of processing gain which minimizes average delay in that case is the smallest processing gain at which multiple operating points are avoided. Two classes of users (voice/data and two data classes) are then considered. Numerical examples are presented which illustrate the increase in the two-dimensional (2-D) capacity region achievable by optimizing the assignment of powers and processing gains to each class.Index Terms-DS-CDMA, integrated voice and data, power control, resource allocation.

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“…We also assume a fixed user population. This is in contrast to the work in [7] and [SI, in which the data and voice traffic is stochastically varying.…”

Section: Introductionmentioning

confidence: 67%

Allocation of DS-CDMA parameters to achieve multiple rates and qualities of service

Honig

Kim²

Proceedings of GLOBECOM'96. 1996 IEEE Global Telecommunications Conference

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We consider a packet data DS-CDMA network which supports multiple traffic classes. Each traffic class has a different requirement on information rate and performance. Given sufficient bandwidth, these requirements can be satisfied by an appropriate assignment of power and processing gain to the users in each class. For a single class of data users we examine the relationship between delay and processing gain. We show that lowering the processing gain below a threshold can produce multiple operating points, which correspond to different delays. Two classes of traffic are then considered corresponding to voice and data, and the delay of the data users is examined as a function of powers and processing gains assigned to both classes.

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Erlang capacity for an integrated voice/data DS-CDMA wireless system with variable bit rate sources

Cited by 24 publications

References 12 publications

An Analytical Framework for the Design and Performance Evaluation of Realistic Aloha-CDMA Systems

An Analytical Framework for the Design and Performance Evaluation of Realistic Aloha-CDMA Systems

Resource allocation for multiple classes of DS-CDMA traffic

Allocation of DS-CDMA parameters to achieve multiple rates and qualities of service

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