Performance and Capacity of a Voice/Data CDMA System with Variable Bit Rate Sources

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

doi:10.1016/b978-012140310-2/50036-8

Cited by 5 publications

(8 citation statements)

References 15 publications

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“…is obtained by the boundary equation (22) and the normalization condition (20). The matrix R is a minimal nonnegative solution of the equation…”

Section: System Analysismentioning

confidence: 99%

“…where 1 is a column vector of ones of order M RT + 1. By combining the expression (58) with the boundary equation (22) and the normalization condition (59), the coefficients β k are solution of the linear system…”

Section: Furthermore the Normalization Condition Becomesmentioning

confidence: 99%

“…In this paper, the authors derive a closed form expression of Erlang capacity for a single type of traffic. The capacity of an uplink with two classes is considered by Mandayam et al [22] in which the real-time traffic is transmitted all the time and the non-real-time or the best-effort traffics are time-shared. Altman [2] considered best-effort and real-time traffic and studied the influence of the value of a fixed (non-adaptive) bandwidth per BE calls on the Erlang capacity of the system (that includes also RT calls), taking into account that a lower bandwidth implies longer call durations.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Uplink Capacity Evaluation of Wireless Networks: Spectral Analysis Approach

Kobbane

El-Azouzi

Ibrahimi

et al. 2010

CIT

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International audienceIn this paper we study the capacity of wireless cellular network, in particular the uplink of WCDMA system by using the two dimensional continuous-time Markov chain (CTMC) technique. Considering two types of calls: real-time (RT) calls characterized by a quasi fixed transmission rate, and best-effort (BE) calls which do not require strict demand but need some reliability conditions, we develop an approach based on the spectral analysis for evaluating the cell capacity. We explicitly obtain the simultaneous distribution of the number of RT connections and the number of BE connections in the steady-state. This analysis allows us to simplify the computation of the performance measures including expected delay and throughput of BE traffic. These performances are obtained explicitly in both cases (finite and infinite) of BE calls as function of system parameters like arrival rate of BE and RT calls, service rate of BE and RT calls. These results allow the operator to evaluate the cell capacity by varying these parameters independently of the number of BE calls according to its policy to manage the network. We further propose some CAC (Call Admission Control) policies for BE traffic. We finally conclude this work with some numerical and simulation results. The simulation results obtained by the network simulator (NS2) are closely related to the numerical results of our analytical results which validate our theoretical model

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“…is obtained by the boundary equation (22) and the normalization condition (20). The matrix R is a minimal nonnegative solution of the equation…”

Section: System Analysismentioning

confidence: 99%

Section: Furthermore the Normalization Condition Becomesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Uplink Capacity Evaluation of Wireless Networks: Spectral Analysis Approach

Kobbane

El-Azouzi

Ibrahimi

et al. 2010

CIT

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show abstract

“…This work also does not account for the dynamic nature of calls. The capacity of voice/data CDMA systems is also analyzed in [13] where both classes are modeled as VBR traffic. Although they consider the number of ongoing calls as random, they assume the same distribution for both types of calls, and we will see that the evolution of the two types calls indeed differ considerably.…”

Section: Introductionmentioning

confidence: 99%

Capacity of Multiservice WCDMA Networks with Variable GoS

Hegde

Altman

2005

Wireless Netw

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Traditional definitions of capacity of CDMA networks are either related to the number of calls they can handle (pole capacity) or to the arrival rate that guarantees that the rejection rate (or outage) is below a given fraction (Erlang capacity). We extend the latter definition to other quality of service (QoS). We consider best-effort (BE) traffic sharing the network resources with real-time (RT) applications. As is often the case in CDMA systems, we assume that the BE traffic access is done using a time-shared channel (such as the HDR or the HSDPA). BE applications can adapt their instantaneous transmission rate to the available one and thus need not be subject to admission control or outages. Their meaningful QoS is the average delay (i.e. the sojourn time). The delay aware capacity is then defined as the arrival rate of BE calls that the system can handle such that their expected delay is bounded by a given constant. We compute in this paper both the blocking probability of the RT traffic having an adaptive Grade of Service (GoS) as well as the expected delay of the BE traffic for an uplink multicell WCDMA system. This yields the Erlang capacity for former and the delay capacity for the latter.

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“…This method calculates the capacity utilisation of the UMTS/WCDMA system on the basis of the probability of outage. www.ijacsa.thesai.org Moreover, in the work developed in [10], the capacity of the uplink is studied with two traffics: RT call is transmitted continuously, and NRT is transmitted in time-sharing. In [11], the author calculates the upstream link capacity of CDMA systems with an idealised power control that contains besteffort applications, i.e.…”

Section: Related Workmentioning

confidence: 99%

Resources Management of High Speed Downlink Packet Access Network in the Presence of Mobility

Almazroi¹

2017

ijacsa

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Abstract-High-Speed Downlink Protocol Access (HSDPA) is a mobile telephony protocol. It is designed to increase data capacity and transfer rate. This paper presents a resource allocation strategy in the HSDPA broadband network. An admission check is proposed. It divides the coverage area of a base station (Node-B) into several regions based on the principle of Adaptive Modulation and Coding (AMC) efficiency.The call admission control (CAC) mechanism distinguishes two RT and NRT traffic according to the type of service requested by the user. It dynamically allocates an effective bandwidth to each accepted call in the system based on its modulation efficiency and maintains its initial rate during its communication.

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Performance and Capacity of a Voice/Data CDMA System with Variable Bit Rate Sources

Cited by 5 publications

References 15 publications

The Uplink Capacity Evaluation of Wireless Networks: Spectral Analysis Approach

The Uplink Capacity Evaluation of Wireless Networks: Spectral Analysis Approach

Capacity of Multiservice WCDMA Networks with Variable GoS

Resources Management of High Speed Downlink Packet Access Network in the Presence of Mobility

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