Dynamic step-size power control in UMTS

Naghian, Siamäk; Rintamaki, M.; Baghaie, R.

doi:10.1109/pimrc.2002.1045450

Cited by 6 publications

(6 citation statements)

References 11 publications

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“…Some methods were proposed to increase the adaptation of power control algorithms by using asymmetric power control steps: different step values for increasing and decreasing power [5]. Other methods suggest an adaptive power variation step in order to decrease oscillations around CIR target and to increase the speed of the power control when the difference between CIR est and CIR target is very high [6] [7]. In the Adaptive-Step Power Control (ASPC) algorithm proposed in [6], if the base station detects the same TPC from a mobile in a set of consecutive slots, the step dedicated to this mobile is increased.…”

Section: Adaptive Stepsmentioning

confidence: 99%

“…Our proposed algorithm adds intelligence to the receiver in order to ask the transmitter to stabilize its power. Unlike the algorithms of [7][8] [9][10], the proposed algorithm does not need more TPC bits than the conventional UMTS power control algorithm. Nevertheless, we show by simulation that the use of a stabilization zone decreases, at the same time, the outage probability and power consumption.…”

Section: Modified Adaptive Power Controlmentioning

confidence: 99%

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Adaptive power control algorithm with stabilization zone for third generation mobile networks

Nasreddine¹,

Nuaymi²,

Lagrange³

2006

Ann. Telecommun.

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In this paper, we propose an evolution of adaptive power control algorithms for Universal Mobile Telecommunications System (UMTS). The proposed mechanism uses an adaptive power step to carry out with high fluctuations in the radio interface. Furthermore, we propose the integration of a stabilization zone where the transmitted power is kept constant to reduce oscillations around the target QoS level. In this algorithm, only the interpretation of power control feedback commands is ameliorated by adding some intelligence to mobiles and base stations. Moreover, the standardized radio interface protocol is used without modification. The algorithm can be used in both link directions of the Frequency Division Duplex (FDD) mode and in the downlink of the Time Division Duplex (TDD) mode, where closed-loop power control algorithms are used. Simulation results show that the proposed algorithm decreases the outage probability and reduces drastically the transmitted power, which are the main objectives of power control algorithms.

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Section: Adaptive Stepsmentioning

confidence: 99%

Section: Modified Adaptive Power Controlmentioning

confidence: 99%

Adaptive power control algorithm with stabilization zone for third generation mobile networks

Nasreddine¹,

Nuaymi²,

Lagrange³

2006

Ann. Telecommun.

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“…P N for cell N) can be assumed to be proportional to the power from the analyzed cell by the proportion factor i P N = i P A . Thus the formula (11) can be solved to formula (12).…”

Section: Capacity Limitationsmentioning

confidence: 99%

“…mobility in the uplink; probably fast fading, which is not included in the simulator, might also be a factor increasing the outage). In [12] and [13] an alternative power control algorithms with a dynamic power step was proposed to help a system to adapt quicker to sudden changes in a varying radio environment.…”

Section: Possible Solutionsmentioning

confidence: 99%

Lost Capacity of the UMTS Radio Access Network

Kordybach

Nousiainen

2006

Wireless Pers Commun

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The theoretical capacity models for the downlink and the uplink of the UMTS radio access network have been researched ever since the UMTS started to be considered. However, they were often based on idealistic assumptions and addressed a static situation. Because of that results were too optimistic. Real networks are not that ideal, as some model suggested. The source of the non-ideality are dynamically changing network properties that are not taken into account in the static models. We explain how those dynamic processes can influence system performance, we define the ineffective load and we update the models to take it into account. The models are supported by simulation results to help comprehend the presented problem. Furthermore, a possible method to estimate such outage in a real network is proposed and ways to minimize the negative impact of the outage discussed.

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“…Other methods suggest an adaptive power variation step in order to decrease oscillations around SIRtarget and to increase the speed of the power control when the difference between SIRest and SIRtarget is very high [6] [7]. The authors of [8] [9][lO] propose a self-tuning predictor algorithm where the TPC is coded on 2, 3 or 4 bits instead of one.…”

Section: Power Control Algorithmsmentioning

confidence: 99%

Downlink adaptive power control algorithm for 3G cellular CDMA networks

Nasreddine¹,

Nuaymi²,

Lagrange³

2004 IEEE 15th International Symposium on Personal, Indoor and Mobile Radio Communications (IEEE Cat. No.04TH8754)

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Adaptive power control algorithms has been widely studied for interference reduction, base station radiation decrease and terminal battery saving in 3G cellular systems. Indus paper, we study some of the existent adaptive power control algorithms and we propoae an evolution of these algorithms in the forward link. In the proposed algorithm, we try to maintain the intercell interference stable and to reduce intracell interference when it is possible. Therefore, the power control steps of mobiles requesting a power increase may be reduced to limit the total power increase if some constraints are verified. The propos,ed algorithm uses an adaptive step, which is updated using the instantaneous mobile power control command and the command history. Moreover, a stabilization zone above the S I R target is used to limit oscillations. The proposed algorithm has been compared to the 3GPP standardized powt:r control and to a recently proposed adaptive power control. Simulation results has shown that the proposed algorithm decreases slightly the outage probability as the already proposed adaptive power control and reduces the power consumption.

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Dynamic step-size power control in UMTS

Cited by 6 publications

References 11 publications

Adaptive power control algorithm with stabilization zone for third generation mobile networks

Adaptive power control algorithm with stabilization zone for third generation mobile networks

Lost Capacity of the UMTS Radio Access Network

Downlink adaptive power control algorithm for 3G cellular CDMA networks

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