System Evaluation of MU-MIMO and Multi-Cluster Allocation in LTE-Advanced Uplink

Nishio, Akihiko; Iwai, Takashi; Matsumoto, Atsushi; Imamura, Daichi

doi:10.1109/vetecs.2012.6239910

Cited by 8 publications

(12 citation statements)

References 7 publications

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“…Therefore, multi-cluster transmission has higher scheduling flexibility compared to SC-FDMA while keeping the power back-off requirements at the UE at a reasonable level. Though not considered in this study, it is worth mentioning that the scheduling flexibility of multi-cluster transmission is particular beneficial when combined with non-perfectly overlapping multi-user multiple-input and multiple-output (MU-MIMO) [28]. The three different multiple access schemes are illustrated in Figure 3.…”

Section: Multi-cluster Transmission In Uplinkmentioning

confidence: 99%

“…The increased CM of the transmitted signal with non-contiguous resource allocation, and the need to still fulfill the in-band and out-band emission masks [29] require the UE PA to operate with an additional power back-off [27][28][29]. Furthermore, the multi-cluster transmission within a CC imposes more stringent linearity requirements on the PA.…”

Section: Maximum Power Reduction For Non-contiguous Allocationmentioning

confidence: 99%

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Radio resource management for uplink carrier aggregation in LTE-Advanced

Wang

Rosa²,

Pedersen

2015

J Wireless Com Network

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This paper investigates the uplink resource allocation problem in the context of Long-Term Evolution (LTE)-Advanced systems with carrier aggregation (CA) and dual-cluster scheduling. On one hand, these Rel'10 functionalities can increase the available transmission bandwidth and scheduling flexibility in uplink. On the other hand, they will introduce additional power back-off for the power amplifier in the user equipment (UE) with non-contiguous resource allocation. Taking into account that the uplink is inherently limited by the maximum transmission power of the UE, the assignment of uplink CA and/or dual cluster transmission for LTE-Advanced UEs has to be careful. A pathloss-threshold-based component carrier (CC) and cluster configuration algorithm is proposed to determine whether an LTE-Advanced UE should be configured with multiple CCs and/or dual cluster scheduling. An extended bandwidth-expansion-based packet scheduling algorithm is proposed for dual-cluster transmission, which tightly couples the bandwidth allocation and packet scheduling together to exploit the frequency domain diversity with low complexity. Simulation results show that with proper differentiation between power-limited and non-power-limited UEs, Rel'10 CA with dual-cluster scheduling can maintain similar coverage performance as in Rel'8 case while achieving substantial gains in median and peak user throughputs. Moreover, the proposed CC assignment algorithm achieves higher user throughput as compared to blindly assigning all UEs on all available CCs.

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Section: Multi-cluster Transmission In Uplinkmentioning

confidence: 99%

Section: Maximum Power Reduction For Non-contiguous Allocationmentioning

confidence: 99%

Radio resource management for uplink carrier aggregation in LTE-Advanced

Wang

Rosa²,

Pedersen

2015

J Wireless Com Network

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“…SC-OFDMA, is also regarded as Discrete Fourier Transform Spread OFDMA (DFT-S-OFDMA). LTE-Advanced supports clustered DFT-S-OFDM technique as the standard technology in the uplink which works closely with uplink MIMO [86][87][88][89]. In this technique, a maximum of 2 non-contiguous frequency clusters can be allocated to a UE.…”

Section: Technical Aspectsmentioning

confidence: 99%

LTE-Advanced Radio Access Enhancements: A Survey

Dehghani

Arshad

MacKenzie

2014

Wireless Pers Commun

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Long Term Evolution Advanced (LTE-Advanced) is the next step in LTE evolution and allows operators to improve network performance and service capabilities through smooth deployment of new techniques and technologies. LTE-Advanced uses some new features on top of the existing LTE standards to provide better user experience and higher throughputs. Some of the most significant features introduced in LTE-Advanced are carrier aggregation, enhancements in heterogeneous networks, coordinated multipoint transmission and reception, enhanced Multiple Input Multiple Output (MIMO) usage and deployment of relay nodes in the radio network. Mentioned features are mainly aimed to enhance the radio access part of the cellular networks. This survey article presents an overview of the key radio access features and functionalities of the LTE-Advanced radio access network, supported by the simulation results. We also provide a detailed review of the literature together with a very rich list of the references for each of the features. An LTE-Advanced roadmap and the latest updates and trends in LTE markets are also presented.

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“…A. Literature Study MU-MIMO RB allocation algorithms for LTE/LTE-A UL have been discussed in [6][7][8][9]11]. In [6], the authors proposed a UE pairing method in conjunction with a maximum expansion method for MU-MIMO RB allocation.…”

Section: Introductionmentioning

confidence: 99%

“…In this way, each UE receives only one cluster of continuous RBs and UEs of each UE pair are fixed (fixed UE pairing). Considering multiple clusters, [8] proposed another pairing (flexible UE pairing) method which processes in unit of UE pairs. Iteratively together with the maximum expansion method, once a couple of an RB and a UE pair are found of a maximal priority value, the maximum expansion is conducted for the UE pair.…”

Section: Introductionmentioning

confidence: 99%

Multi-user MIMO scheduling in LTE-advanced uplink systems

Hsu

Chao

Liu

et al. 2013

2013 IEEE 24th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC)

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Due to the facts of wireless data usage being increasing faster now than ever before and more multimedia content being generated by users and uploaded to the network, multi-user MIMO (MU-MIMO) technology would be crucial to improve the LTE-A uplink spectral efficiency for meeting the service demands. On the other side, adopting clustered SC-FDMA technology as the uplink multiple access scheme of LTE-A means that a User Equipment (UE) can be allocated more than one cluster which consists of contiguous RBs (this is the contiguity constraint). Moreover, all allocated RBs to a UE must use the same modulation and coding scheme (this is the robust rate constraint). The two constraints make MU-MIMO UL scheduling more complicated. In this paper, we formulate the MU-MIMO UL scheduling problem with taking two constraints into consideration. Since this optimization had been proven to be an NP-hard problem, we further develop two low-complexity heuristic algorithms. We demonstrate that competitive performance can be achieved in terms of system throughput and fairness index.

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System Evaluation of MU-MIMO and Multi-Cluster Allocation in LTE-Advanced Uplink

Cited by 8 publications

References 7 publications

Radio resource management for uplink carrier aggregation in LTE-Advanced

Radio resource management for uplink carrier aggregation in LTE-Advanced

LTE-Advanced Radio Access Enhancements: A Survey

Multi-user MIMO scheduling in LTE-advanced uplink systems

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