An FDD Multihop Cellular Network for 3GPP-LTE

Schoenen, Rainer; Halfmann, R.; Walke, Bernhard

doi:10.1109/vetecs.2008.449

Cited by 40 publications

(29 citation statements)

References 13 publications

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“…Furthermore, the paper benefits from considering scheduling which adapts to channel conditions but lacks realism since unlimited flow sizes are assumed. Other studies which show the advantages of relaying for OFDMA networks are [11,14], while [13] and [3] concentrate on WiMAX networks.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Uplink Packet Schedulers in Cellular Networks with Relaying

Dimitrova

Berg

Heijenk

2009

Wireless and Mobile Networking

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Abstract. Deployment of intermediate relay nodes in cellular networks, e.g. UMTS/ HSPA, has been proposed for service enhancement, which is of particular importance for uplink users at the cell edge suffering from low power capacity and relatively poor channel conditions. In this paper, we propose and investigate a number of uplink packet scheduling schemes deploying the relay functionality in different ways. Using a combined packet and flow level analysis capturing the specifics of the scheduling schemes and the random behavior of the users (initiation and completion of flow transfers), the performance of the various schemes is evaluated and compared to a reference scenario where relaying is not used. The main performance measures considered in our study are the instantaneous data rate, the energy consumption and the mean flow transfer time. Interestingly, considering flow transfer times, it is found that the use of relay nodes is not only particularly beneficial for users at the cell edge but also has a strongly positive effect on the performance of users at locations close to the base station.

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Section: Introductionmentioning

confidence: 99%

Performance Analysis of Uplink Packet Schedulers in Cellular Networks with Relaying

Dimitrova

Berg

Heijenk

2009

Wireless and Mobile Networking

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“…RNs are useful to extend the coverage area of a radio cell or to increase the throughput capacity of a cell [4], [14]. Relaying for FDD systems is preferentially organized in the time domain [11], i.e. radio resources (orthogonal OFDMA blocks in time and frequency domain) are partitioned among all serving stations (BS and RNs) and the roles alternate in time when a RN is in its serving role (actively responsible for resource allocation to its UTs) and in its UT role (passive, using resources allocated by the BS).…”

Section: Multihop Schedulingmentioning

confidence: 99%

“…By utilizing a more sophisticated scheduler with resource partitioning, the coexistence of FDFDD and HDFDD terminals in a radio cell is significantly improved. The radio frame organization is kept like common in OFDMA FDD systems [11], but for HDFDD two duplex groups (1 or 2) are introduced in order to alternate and interleave their DL and UL phases. The respective scheduling of resources enables the parallel operation of FDFDD and HDFDD terminals.…”

mentioning

confidence: 99%

Concurrent Operation of Half- and Full-Duplex Terminals in Future Multi-Hop FDD Based Cellular Networks

Schoenen

Otyakmaz

Walke

2008

2008 4th International Conference on Wireless Communications, Networking and Mobile Computing

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Abstract-Future OFDM-based cellular radio networks like IMT-Advanced systems are planned with both frequency division duplex and time division duplex in mind. Each of these duplex schemes has its benefits and drawbacks dependent on the scenario. In short-range communication and with small radio cells TDD is appropriate. For wide area cells FDD is preferred in general. If combined with multihop, i.e. the use of fixed relays, wide area cells can be built with a reduced number of base stations.Economic rationale also leads to the requirements to produce cheaper terminal equipment. Full duplex FDD terminals can transmit and receive simultaneously, but need high quality, expensive RF duplex-filters, in order to separate uplink and downlink channels. Half-duplex FDD terminals are lower in cost and therefore an interesting solution. This paper shows how halfduplex terminals should be operated to achieve the same performance as full-duplex terminals. The coordination of half-and full-duplex terminal operation by the base station is a challenge. This paper introduces the resource scheduling algorithm located in the MAC layer and discusses implications and performance results especially for multihop cellular networks.

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“…The aim here is to optimally assign resources to those users which need them, keeping in view not only their resource requirements, but also their instantaneous channel quality, instantaneous service quality, and the allocation history. Although, the presence of RN (multi-hop transmission) has proved to enhance the LTE system [4][5][6][7], it introduces some additional design challenges in the traditional resource allocation task. This article is precisely dedicated to addressing the resource allocation challenges in relay-enhanced networks (REN), and here we explore the following key issues: http://jwcn.eurasipjournals.com/content/2012/1/364…”

Section: Introductionmentioning

confidence: 99%

Resource allocation in relay enhanced LTE-Advanced networks

Moraes

Nisar

González

et al. 2012

J Wireless Com Network

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Relay deployment in future mobile networks is a vital measure to enhance the coverage region of regular base stations, to overcome shadowing dips, and to bring improvements in the cell-edge performance. In this regard, resource allocation in a relay-enhanced scenario is a key design task, and has become a very interesting research topic over the past few years. In this article, we study two main resource allocation aspects of a relay-enhanced scenario. First, we concentrate on the problem of multiplexing the relay backhaul link and the direct link at the base station scheduler for in-band as well as out-band relay operations. We propose three distinct resource partitioning strategies, and evaluate their performance via long-term evolution (LTE) system level simulations in the downlink direction. We observe that even the low implementation effort algorithms bring appreciable improvement for the cell-edge users with or without small loss in performance for the other users, thereby enhancing system fairness. Second, we visit the problem of supporting heterogeneous quality of service (QoS) requirements in a multi-user relay-enhanced network. To this end, we introduce a QoS-aware scheduler which uses packet latency and rate requirements to prioritise the scheduling decisions. Moreover, we also propose a mechanism to support QoS-constrained services to the relayed users, served over two (or more) hops. Employing an LTE system level simulator, for relay-enhanced scenario with a traffic mix having distinct QoS requirements, we demonstrate that the proposed QoS-aware resource allocation strategy significantly increases the fraction of QoS-satisfied users.

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An FDD Multihop Cellular Network for 3GPP-LTE

Cited by 40 publications

References 13 publications

Performance Analysis of Uplink Packet Schedulers in Cellular Networks with Relaying

Performance Analysis of Uplink Packet Schedulers in Cellular Networks with Relaying

Concurrent Operation of Half- and Full-Duplex Terminals in Future Multi-Hop FDD Based Cellular Networks

Resource allocation in relay enhanced LTE-Advanced networks

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