Power allocation strategies for the downlink in a W-CDMA system with soft and softer handover: the impact on capacity

Pistelli, W.-U.; Verdone, Roberto

doi:10.1109/pimrc.2002.1046649

Cited by 10 publications

(11 citation statements)

References 8 publications

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“…An expression for downlink capacity estimation has been derived in [2] for omnidirectional network structures (1 sector per cell with base station installed at the cell center and equipped with an omnidirectional antenna). In [11], the capacity calculation method presented in [2] is extended to the case of adaptive antennas.…”

Section: Downlink Capacity Estimationmentioning

confidence: 99%

“…internet and video streaming [1]. Furthermore, a mobile requiring a large fraction of the maximum base station (BS) transmit power could reduce the overall capacity [2]. Advanced antenna technologies form a key technique that can be used to enhance the downlink user capacity [3], [4].…”

Section: Introductionmentioning

confidence: 99%

“…In [12], the impact of power limitation on a single link is studied with respect to average power transmitted to each mobile. The impact on capacity of a power allocation strategy is studied in [2]. However, the strategy developed in [2] for the conventional three sectors case was not extended to the adaptive antennas case.…”

Section: Introductionmentioning

confidence: 99%

“…The impact on capacity of a power allocation strategy is studied in [2]. However, the strategy developed in [2] for the conventional three sectors case was not extended to the adaptive antennas case. In this work, the impact on capacity of using the antenna arrays of [11] in conjunction with the power allocation strategy of [2] is studied taking into account various antenna array configurations and schemes.…”

Section: Introductionmentioning

confidence: 99%

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On WCDMA Downlink Capacity with Power Allocation Strategy and Adaptive Antenna Arrays

Yaacoub

Dawy

2008

2008 IEEE International Conference on Communications

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The base station transmit power is a common resource shared among multiple users in the downlink of WCDMA cellular systems. The overall user capacity decreases if a certain user consumes a large fraction of the base station power. In this work, we investigate the performance gains of adaptive antenna arrays with a power allocation strategy that limits the maximum fraction of transmit power per user. Using adaptive antenna arrays at base stations is a key technique to improve the downlink capacity of WCDMA cellular systems. We consider two adaptive antenna schemes: fixed beam and steered beam. For each scheme, we study the impact on capacity of the proposed power allocation strategy. Uniform linear arrays, uniform circular arrays, and Chebyshev antenna arrays are used to form the beams. The adopted simulation environment supports various types of adaptive antenna arrays, soft/softer handover, and multiple services. Results demonstrate an increase in capacity due to the power allocation scheme, especially when combined with adaptive antenna arrays. A remarkable superiority of the Chebyshev antenna array configuration is shown.

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Section: Downlink Capacity Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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On WCDMA Downlink Capacity with Power Allocation Strategy and Adaptive Antenna Arrays

Yaacoub

Dawy

2008

2008 IEEE International Conference on Communications

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“…This is because the MS is equipped with a Rake receiver capable of performing MRC of the signals it receives from the transmitting BSs; (2) the energy-to-interference contributions from involved BSs are the same. They are used to simplify the modeling of the MRC mechanism and have been widely applied [4,9,13]. We denote Λ as the SHO factor (SHOF), which is the number of BSs involved in the SHO process for an MS. With perfect power control, the transmitted power from BS to MS should be proportional to the interference, and the power can be adjusted so that it has the same shape as the total interference.…”

Section: Introductionmentioning

confidence: 99%

Adaptive channel reservation for call admission control to support prioritized soft handoff calls in a cellular CDMA system

Chu

Hung²,

Lin

2009

Ann. Telecommun.

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This paper proposes a prioritized call admission control (CAC) model to support soft handoff calls with quality of service (QoS) assurances for both the uplink and downlink connections in a CDMA system. CAC is formulated as a combinatorial optimization problem in which the problem objective is to minimize the handoff forced termination rate. The model, which is based on the adaptive channel reservation (ACR) scheme for prioritized calls, adapts to changes in handoff traffic where the associated parameters (reserved channels, and new and handoff call arrival rates) can be varied. To solve the optimization model, iteration-based Lagrangean relaxation is applied by allocating a time budget. We express our achievements in terms of the problem formulation and performance improvement. Computational experiments demonstrate that the proposed ACR scheme outperforms other approaches when there are fewer rather than more channels, and it reduces the handoff call blocking rate more efficiently when the handoff traffic is heavily loaded. Moreover, the model can be adapted to any kind of reservation service.

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Real-Time Admission Control Supporting Prioritized Soft Handoff Calls in Cellular DS-CDMA Systems

Chu

Lin

2004

Lecture Notes in Computer Science

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Power allocation strategies for the downlink in a W-CDMA system with soft and softer handover: the impact on capacity

Cited by 10 publications

References 8 publications

On WCDMA Downlink Capacity with Power Allocation Strategy and Adaptive Antenna Arrays

On WCDMA Downlink Capacity with Power Allocation Strategy and Adaptive Antenna Arrays

Adaptive channel reservation for call admission control to support prioritized soft handoff calls in a cellular CDMA system

Real-Time Admission Control Supporting Prioritized Soft Handoff Calls in Cellular DS-CDMA Systems

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