Quality based HSDPA access algorithms

Pedersen, Klaus I.

doi:10.1109/vetecf.2005.1558999

Cited by 10 publications

(8 citation statements)

References 14 publications

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“…at most 10 percent [18]. With real-time streaming applications being contemplated [19], the delay requirement would suggest BLER values comparable to those in dedicated channels, i.e. 1% or lower [3], [20].…”

Section: System Modelmentioning

confidence: 99%

Downlink Scheduling Schemes for CDMA Networks with Adaptive Modulation and Coding and Multicodes

Kwan

Leung

2007

IEEE Trans. Wireless Commun.

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For the problem of allocating radio resources in the downlink of a CDMA network studied in [1], the modulation and coding schemes, numbers of multicodes, and transmit powers used for all mobile stations (MS's) are jointly chosen so as to maximize the total transmission bit rate during each scheduling interval, subject to certain constraints. The approach employs discrete mathematical programming, which is potentially complex, and analytical solutions are not available. In this paper, sub-optimal approaches are examined. In particular, analytical expressions are derived for optimal resource allocation involving a single MS. Based on the single-MS solution, a sub-optimal, sequential optimization procedure for multiple MS's is presented. Numerical results show that when the order for allocating resources to MS's is judiciously chosen based on the MS channel conditions and/or traffic loads, the sequential solution is an attractive alternative to the more complex joint optimization. This is especially true when radio resources are scarce.Index Terms-Adaptive modulation and coding, CDMA, downlink scheduling, high-speed packet data, multicode.

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Section: System Modelmentioning

confidence: 99%

Downlink Scheduling Schemes for CDMA Networks with Adaptive Modulation and Coding and Multicodes

Kwan

Leung

2007

IEEE Trans. Wireless Commun.

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“…We use a quality based HSDPA admission control algorithm that was proposed in [13] with some modifications. In this approach, a new user is admitted only if it can be served with its target bit rate without degrading the throughput of all the users with the same or higher SPI (priority) from their target bit rates.…”

Section: Quality Based Hsdpa Admission Controlmentioning

confidence: 99%

“…[12] proposes an algorithm that provides QoS guarantees using barrier functions. A quality based admission control algorithm is derived in [13].…”

Section: Introductionmentioning

confidence: 99%

Integrating admission control and packet scheduling for quality controlled streaming services in HSDPA networks

Gomes

Choi

Kim³

et al. 2007

2007 Fourth International Conference on Broadband Communications, Networks and Systems (BROADNETS '07)

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High-Speed Downlink Packet Access (HSDPA) uses a shared forward link packet data channel that can achieve peak data rates up to 14.4 Mbps. The newly introduced features that are key to reaching such high rates are link adaptation, Hybrid ARQ (HARQ) and fast scheduling. The decision to admit new users is still taken by the Radio Network Controller (RNC); however, the scheduling role has been moved to the base station (Node-B) for fast adaptability. Although in high speed cellular networks, opportunistic scheduling can exploit multiuser diversity to maximize throughput, with the growing need for strict QoS guarantees for services such as streaming, gaming, and VoIP, a balance should be struck between maximizing throughput and providing user satisfaction. Service operators can enforce their own policies in providing user satisfaction. In this paper, we consider a QoS-aware policy driven scheduling algorithm and its interaction with the admission control mechanism at the RNC. We developed a dynamic HSDPA network simulator in OPNET with link adaptation, HARQ, fast scheduling and quality based admission control. Our simulations show that even with the presence of an admission controller at RNC, the wellknown proportional fairness (PF) algorithm dismally fails to provide user satisfaction for streaming services, whereas our Strict Policy Scheduling (SPS) algorithm substantially increases user satisfaction as intended by the admission controller while providing a significant cell capacity gain.

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“…The feedback measurements from the Node-B to the RNC in Fig. 2 (the carrier transmit power, the average non-HSDPA power, the HS-DSCH required power, and the HS-DSCH provided bit rate) can be used for HSDPA admission control decisions as discussed in [6]. The SPI and the GBR are therefore the two primary parameters to control QoS differentiation on HSDPA.…”

Section: Architecture and Qos Parameter Settingmentioning

confidence: 99%

“…1 shows an overview of the architecture for HSDPA, including the user-plane protocol stack and the primary radio resource management (RRM) algorithms at the RNC. The RRM functions at the RNC include the quality based HSDPA access control algorithm [5]- [6], handover control [17], setting of HSDPA specific QoS parameters, and allocation of HSDPA transmission resources (power and channelization codes) to the MAC-hs. In principle, the RNC and Node-B could be from different equipment manufacturers, so that the exact implementation of MAC-hs packet scheduling algorithm is partly unknown by the RRM functions at the RNC.…”

Section: Introductionmentioning

confidence: 99%

QoS Considerations for HSDPA and Performance Results for Different Services

Pedersen

Mogensen

Kolding

2006

IEEE Vehicular Technology Conference

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The functional split between the centralized radio network controller (RNC) and the base station (Node-B) presents new challenges and opportunities for implementing QoS control for HSDPA. In this paper we present different options for implementing QoS over HSDPA, and we focus particularly on the shared responsibility between the QoS aware algorithms at the RNC and the Node-B. Different strategies for QoS aware Node-B packet schedulers are discussed. The paper is concluded with network performance results for different services over HSDPA, ranging from simple best effort traffic, to constant bit rate streaming, and voice over IP. For these services we show capacity gains of up to 40% from using QoSaware packet scheduling.

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Quality based HSDPA access algorithms

Cited by 10 publications

References 14 publications

Downlink Scheduling Schemes for CDMA Networks with Adaptive Modulation and Coding and Multicodes

Downlink Scheduling Schemes for CDMA Networks with Adaptive Modulation and Coding and Multicodes

Integrating admission control and packet scheduling for quality controlled streaming services in HSDPA networks

QoS Considerations for HSDPA and Performance Results for Different Services

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