Providing Congestion Control in the Iub Transport Network for HSDPA

Nádas, Szilveszter; Rácz, Sándor; Nagy, Zoltán; Molnár, Sándor

doi:10.1109/glocom.2007.1003

Cited by 12 publications

(19 citation statements)

References 8 publications

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“…At this regard, best practices for backhaul design has been recently issued by NGMN Alliance [7] and there is an increasing number of solutions that can be adopted from different vendors to optimize the backhaul network [8]. As well, flow control mechanisms have been introduced in current mobile networks between BSs and radio controllers to partially mitigate traffic peaks in the backhaul links at the expenses of an increased delay in some services [9], [10]. Attending to previous considerations, the probability of facing a situation where the backhaul capacity of a given cell site becomes the bottleneck should not be underestimated [11].…”

Section: Introductionmentioning

confidence: 99%

Enhanced base station assignment approach for coping with backhaul constraints in OFDMA-based cellular networks

Galeana

Ferrús

2010

2010 European Wireless Conference (EW)

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Abstract-In this paper we extend the base station (BS) assignment problem to incorporate backhaul related constraints into the assignment decision. This is motivated by the fact that the deployment of more spectral efficient radio access technologies are currently imposing stringent bandwidth requirements at cell sites, and there is a growing concern that backhaul network can become a new network bottleneck in certain deployment scenarios. Unlike existing assignment approaches, we propose a BS assignment algorithm envisioned as a suitable technique capable to cope, at some extent, with possible backhaul congestion situations in OFDMA-based systems. Simulation results demonstrate that the proposed algorithm can provide the same system capacity with less backhaul resources so that, under backhaul bottleneck situations, a better overall network performance is effectively achieved.

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Section: Introductionmentioning

confidence: 99%

Enhanced base station assignment approach for coping with backhaul constraints in OFDMA-based cellular networks

Galeana

Ferrús

2010

2010 European Wireless Conference (EW)

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“…If the rest of the system is left unchanged, RLC cannot efficiently resolve these congestion situations, because it was not prepared for congestion control, but only for radio link failures. As a consequence, a mechanism is needed to resolve potential TN congestion, because RLC is hiding it from TCP by considering it as radio link failure [3], [4]. Since RLC considers data loss and increasing delay as radio link failure, it simply resends packets suspected to be lost.…”

Section: Introductionmentioning

confidence: 99%

“…The most common and mainstream solution is to apply a system-specific flow control/congestion control below RLC in Iub Framing Protocol layer by extending the existing flow control introduced by 3GPP with congestion control functionality [4]. In this way i) TN congestion is resolved locally below RLC, ii) RLC handles radio link failures and iii) TCP resolves congestion on the non-3GPP part (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…Iub became a bottleneck and therefore congestion may occur in the RLC loop), thus the new shortcomings of the RLC protocol should be handled somehow. Existing solutions, such as resolving congestion below RLC in a separated layer [4] are efficient solutions, but we investigate a different approach. In this paper, we study how the RLC can be extended to be used over congested wired links.…”

Section: Introductionmentioning

confidence: 99%

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Window-based HSDPA Transport Network Congestion Control

Palyi

Rácz

Nádas

2010

2010 European Wireless Conference (EW)

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In the High-Speed Downlink Packet Access (HS-DPA) Iub Transport Network (TN) which connects the Radio Network Controller (RNC) with base stations (Node Bs), congestion control is needed. This paper reviews existing congestion control solutions and describes a novel, non-standardized, cross-layer, window-based HSDPA Transport Network Congestion Control which uses the standardized congestion detection and signalling framework. This solution is based on the idea of extending the Radio Link Control (RLC) protocol with congestion control functionality. This idea originates from the interesting duality between the TCP and the RLC protocols. TCP was originally designed for wired networks, therefore many extensions have been proposed to make TCP to be efficiently used over wireless networks. RLC was originally designed exclusively for handling radio link failures and no RLC extensions have been proposed to make RLC to be efficiently used over congested wired links. This paper proposes such an RLC extension where the RLC transmission window size is used to control the bitrate of the flow. Simulation analysis of this window-based solution is performed and it is shown that the proposed method is a possible solution for and efficient Iub Transport Network congestion control.

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“…In this context, best practices for efficient backhaul design have been recently issued by NGMN Alliance [5] and there is an increasing number of solutions pushing for the adoption of more cost-effective transmission technologies than those used in most current deployments [3]- [6] along with new resource management functionality specifically tailored to tackle backhaul congestion [7]. As a matter of fact, flow control mechanisms have been already introduced in current mobile networks to partially mitigate traffic peaks in the backhaul at the expenses of an increased delay in some services [8], [9]. Attending to previous considerations, cellular network capacity limitations due to a shortage of backhaul capacity should not be underestimated in some network deployments.…”

mentioning

confidence: 99%

Design and Evaluation of a Backhaul-Aware Base Station Assignment Algorithm for OFDMA-Based Cellular Networks

Galeana-Zapién

Ferrús

2010

IEEE Trans. Wireless Commun.

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Existing base station (BS) assignment methods in cellular networks are mainly driven by radio criteria since it is assumed that the only limiting resource factor is on the air interface. However, as enhanced air interfaces have been deployed, and mobile data and multimedia traffic increases, a growing concern is that the backhaul of the cellular network can become the bottleneck in certain deployment scenarios. In this paper, we extend the BS assignment problem to cope with possible backhaul congestion situations. A backhaul-aware BS assignment problem is modeled as an optimization problem using a utility-based framework, imposing constraints on both radio and backhaul resources, and mapped into a Multiple-Choice Multidimensional Knapsack Problem (MMKP). A novel heuristic BS assignment algorithm with polynomial time is formulated, evaluated and compared to classical schemes based exclusively on radio conditions. Simulation results demonstrate that the proposed algorithm can provide the same system capacity with less backhaul resources so that, under backhaul bottleneck situations, a better overall network performance is effectively achieved.Index Terms-BS assignment algorithms, mobile backhaul, OFDMA, radio resource management.

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Providing Congestion Control in the Iub Transport Network for HSDPA

Cited by 12 publications

References 8 publications

Enhanced base station assignment approach for coping with backhaul constraints in OFDMA-based cellular networks

Enhanced base station assignment approach for coping with backhaul constraints in OFDMA-based cellular networks

Window-based HSDPA Transport Network Congestion Control

Design and Evaluation of a Backhaul-Aware Base Station Assignment Algorithm for OFDMA-Based Cellular Networks

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