The high speed packet data evolution of WCDMA

Parkvall, Stefan; Dahlman, Erik; Frenger, Pål; Beming, Per; Persson, Magnus

doi:10.1109/pimrc.2001.965315

Cited by 41 publications

(22 citation statements)

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“…The HSDPA (High Speed Downlink Packet Access) has been introduced in UMTS (3GPP specifications for Release 5) in order to adapt more dynamically the radio resource to the nature of packet switched traffic, and to offer a throughput transmission higher than in WCDMA [2][3] [4]. The HSDPA is, by nature, well adapted to Non-Real Time (NRT) services (no delay constraint).…”

Section: Application: Scheduling In Hsdpamentioning

confidence: 99%

“…Whereas all calls use CDMA, we assume that NRT calls are time-multiplexed (which diminishes the amount of interference, thus increasing the available average throughputs). This combination of time multiplexing over CDMA is typically for high speed downlink data channels, such as the High Speed Downlink Packet Access (HSDPA) [4] and the High Data Rate (HDR) in CDMA-2000 systems [1].…”

Section: Iii2 Priority Queuesmentioning

confidence: 99%

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Cellular network with continuum priority set

Kélif¹,

Altman²

2007

Proceedings of the 2nd International ICST Conference on Performance Evaluation Methodologies and Tools

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Abstract-We consider the following problem of spatial downlink prioritization. Mobiles arrive at a cell at locations that are determined according to some probability distribution. The further a mobile is from the base station, the weaker is its received power and thus the lower is the transmission rate to it. Beside this uncontrollable phenomenon that differentiates between mobiles according to their location, one can design other controlled mechanisms that differentiate between them. We analyse various priority policies where the assigned priority is given in terms of the distance of the mobiles from the base station. This gives rise to a whole continuum of priority levels. We study the influence that the combined location density and priority policy have on the quality of service of the mobiles and on the network overall performance. Applying our model to a HSDPA system, we calculate a quality of service indicator, the sojourn time, using a priority scheduling strategy, a processor sharing one and a first come first served one. Considering three types of arrival flow, a uniform one, a non uniform one and a flow which generates a constant load in the cell, we show the sojourn time depends on the adopted strategy, but also on the location of the mobile and on the arrival flow type. In particular, a numerical study based on our model shows that a maximum SIR priority does not provide in any case the minimum sojourn time.

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Section: Application: Scheduling In Hsdpamentioning

confidence: 99%

Section: Iii2 Priority Queuesmentioning

confidence: 99%

Cellular network with continuum priority set

Kélif¹,

Altman²

2007

Proceedings of the 2nd International ICST Conference on Performance Evaluation Methodologies and Tools

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show abstract

“…This modeling is consistent with a fair implementation of a high data rate scheme. Specifically, schemes such as HDR [1], corresponding to the CDMA 1xEV-DO standard, and its 3GPP counterpart HSDPA [13] have been proposed for the downlink in order to achieve higher transmission rates. These schemes implement a complex scheduler which evaluates channel conditions and pending transmissions for each connection, using additionally fast retransmission and multicoding to improve throughput.…”

Section: Admission and Rate Controlmentioning

confidence: 99%

“…This work is a follow-up of [5], [8] in which NRT traffic was scheduled using a timesharing approach, as is the case in the High Speed Downlink Packet Access (HSDPA) system [13], [7]. This allowed to derive a tractable mathematical model based on a homogeneous QBD (Quasi Birth-Death) process [12], [11].…”

Section: Introductionmentioning

confidence: 99%

A Non-homogeneous QBD Approach for the Admission and GoS Control in a Multiservice WCDMA System

Koukoutsidis

Altman

Kélif

2005

Quality of Service – IWQoS 2005

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Abstract. We consider a WCDMA system with real time (RT) calls that have dedicated resources, and data non-real-time (NRT) calls that share system capacity. We apply reservation of some resources for the NRT traffic and assume that this traffic is further assigned the resources unused by RT calls. The grade of service (GoS) of RT traffic is also controlled in order to allow for handling more RT calls during congestion periods, at the cost of degraded transmission rates. We consider both the uplink and downlink, and derive performance evaluation results regarding user-perceived QoS parameters, namely the blocking rates of RT calls and sojourn time of NRT calls. On what concerns the bandwidth-sharing policy of NRT traffic, we compare WCDMA behavior in the presence of a high data rate scheme. Finally, we extend our results to cover NRT admission control schemes and examine blocking behavior and transfer times of NRT traffic.

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“…Whereas all calls use CDMA, we assume that NRT calls are further time-multiplexed (which diminishes the amount of interference, thus increasing the available average throughputs). This combination of time multiplexing over CDMA is typically for high speed downlink data channels, such as the High Speed Downlink Packet Access (HSDPA) [13] and the High Data Rate (HDR) in CDMA-2000 systems [1].…”

Section: Introductionmentioning

confidence: 99%

Admission and GoS control in a multiservice WCDMA system

Kélif¹,

Altman²,

Koukoutsidis³

2007

Computer Networks

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We consider in this paper a WCDMA system with two types of calls: real time (RT) calls that have dedicated resources, and data non-real time (NRT) calls that are treated using a time-shared channel (such as the HDR or the HSDPA). We consider reservation of some resources for the NRT traffic and assume that this traffic is further assigned the resources left over from the RT traffic. The grade of service (GoS) of RT traffic is also controlled in order to allow for handling more RT calls during congestion periods, at the cost of degraded transmission rates. We consider both the downlink (with and without macrodiversity) as well as the uplink and study the blocking probabilities of RT traffic as well as the expected sojourn time of NRT traffic. We further study the conditional expected sojourn time of a data connection given its size and the state of the system. Finally, we extend our framework to handle handover calls.

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The high speed packet data evolution of WCDMA

Cited by 41 publications

References 0 publications

Cellular network with continuum priority set

Cellular network with continuum priority set

A Non-homogeneous QBD Approach for the Admission and GoS Control in a Multiservice WCDMA System

Admission and GoS control in a multiservice WCDMA system

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