Admission control for VoIP over HSDPA in a mixed traffic scenario

Braga, Andre R.; Wänstedt, Stefan; Ericson, M.

doi:10.1109/its.2006.4433245

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Although in [4] these admission thresholds are fixed, the main idea in the Adaptive CC framework is to adapt them according to the congestion status of an RT service.…”

Section: A Admission Controlmentioning

confidence: 99%

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Overload Prediction Based on Delay in Wireless OFDMA Systems

Lucena

Lima

Freitas

et al. 2010

2010 IEEE Global Telecommunications Conference GLOBECOM 2010

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In this work we deal with Congestion Control (CC) strategies to protect the Quality of Service (QoS) of Real Time (RT) services in Orthogonal Frequency Division Multiple Access (OFDMA)-based and packet-switched networks such as Long Term Evolution (LTE) and Worldwide Interoperability forMicrowave Access (WiMAX). Specifically, the first contribution of this paper is the adaptation of a CC strategy previously proposed for High-Speed Downlink Packet Access (HSDPA) to these modern systems. This CC strategy comprises in a coordinated manner the functionalities scheduling, Admission Control (AC) and Load Control (LC). The second contribution is the proposal of a new feature to be added to this CC strategy in order to allow for an early detection of overload situations based on the packet delay of RT flows. In the results we show that our proposed overload prediction based on delay can efficiently prevent QoS degradation of RT flows.

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“…Although in [4] these admission thresholds are fixed, the main idea in the Adaptive CC framework is to adapt them according to the congestion status of an RT service.…”

Section: A Admission Controlmentioning

confidence: 99%

“…The LC algorithm is responsible for the adaptation of α and so to establish different priorities between the services as it will be discussed in section II-C. More details about SAC can be found in [3], [4].…”

Section: A Admission Controlmentioning

confidence: 99%

Overload Prediction Based on Delay in Wireless OFDMA Systems

Lucena

Lima

Freitas

et al. 2010

2010 IEEE Global Telecommunications Conference GLOBECOM 2010

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“…If greater, the new flow is rejected; if lower the flow is admitted. More details about SAC can be found in [1], [11]. The procedure is the same if the new flow is of an NRT service.…”

Section: A Admission Controlmentioning

confidence: 99%

“…For a VoIP flow, the satisfaction is reached when it was not blocked by the AC functionality and the experienced FER is equal to or lower than 1% [15]. For the WWW service, the flow is satisfied when it was not blocked and the average throughput is at least 64 kbps [11].…”

Section: B Performance Metrics and Simulations Scenariosmentioning

confidence: 99%

Congestion Control Framework for Real-Time Services in OFDMA-based Systems

Lucena¹,

Lima²,

Freitas³

et al. 2009

Anais Do XXVII Simpósio Brasileiro De Telecomunicações

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In [1] the authors proposed a Quality of Service (QoS)-driven adaptive Congestion Control (CC) framework that can provide QoS guarantees for the Voice over IP (VoIP) service in mixed traffic scenarios in a single carrier system. The original framework is composed of three Radio Resource Management (RRM) algorithms: Admission Control (AC), Packet Scheduling (PSC) and Load Control (LC). In this work we generalize that framework to systems that employ a multicarrier access scheme such as Orthogonal Frequency Division Multiple Access (OFDMA). In OFDMA-based systems, there is flexibility to exploit the frequency dimension to achieve even better performance gains. In this work, we propose significant changes especially in the PSC functionality where radio resource allocation is performed. Using simulations, we evaluate the generalized CC framework in an OFDMA-based system with a traffic mix composed of sessions from a Real Time (RT) and a Non-Real Time (NRT) service. The results show that the generalized CC framework not only protects the QoS of sessions from the RT service but also imposes only a small performance degradation to the NRT service.

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