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## A Dynamic Clustering and Resource Allocation Algorithm for Downlink CoMP Systems with Multiple Antenna UEs,” http://arxiv.org/abs/1311.5114, 2013. BIOGRAPHIES FEDERICO BOCCARDI (federico.boccardi@vodafone.com) is a principal engineer in Vodafone. He recei

Venue: | Padova, Italy, in 2002 and 2007 respectively |

Citations: | 3 - 1 self |

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Citation Context ... random variables with σ2k,j as statistical power. Results are obtained by simulating 100 UE drops and T = 200 block channel realizations for each UE drop. We assume that proportional fair scheduling =-=[36]-=- is implemented to provide fairness among UEs, i.e., αk(t) = 1/R̄k(t), with R̄k(t+1) = (1−γ)R̄k(t)+γRk(t), t = 0, 1, . . . , T− 1, where γ = 0.1 is the forgetting factor and we initialize R̄k(1) = log... |

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Citation Context ...m and a minimum distance dmin = 35 m between BSs and UEs. Wraparound is used to deal with boundary effects [34]. We also assume that channels are correlated by considering the popular Kronecker model =-=[35]-=-. By denoting with RBS the square correlation matrix of size M at the BS, with tr(RBS) = M , and with RUE the square correlation matrix of size N at the UE, with tr(RUE) = N , we can write Hk,j(t) = R... |

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Citation Context ...) at the cell-edge [1]. Supported by the first results promising huge gains with respect to the baseline non-cooperative system [2], a lot of attention has been paid to the topic both in the academia =-=[3]-=-, [4] and in the industry [5], [6]. These techniques, known in the industry as coordinated multi-point (CoMP), are classified into a) coordinated scheduling/beamforming (CS/CB), which require channel ... |

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Citation Context ...ithm by explicitly considering that UEs are equipped with multiple antennas. In our proposal, UEs can exploit these additional degrees of freedom by implementing interference rejection combiner (IRC) =-=[22]-=- to partially suppress the ICI and being served by means of a multi-stream transmission. Moreover, differently from many works on dynamic clustering where UE selection is not considered and a simple r... |

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Citation Context ... achieved in cellular systems, in particular by the user equipments (UEs) at the cell-edge [1]. Supported by the first results promising huge gains with respect to the baseline non-cooperative system =-=[2]-=-, a lot of attention has been paid to the topic both in the academia [3], [4] and in the industry [5], [6]. These techniques, known in the industry as coordinated multi-point (CoMP), are classified in... |

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Citation Context ...k . (14) Last, BSs in Jc yield an estimate of the weighted sum rate R̂(c) by solving the optimization problem (15), at the top of the page. Maximization (15) is a well studied multi-user MIMO problem =-=[30]-=- involving a) UE selection, b) transmission rank selection, c) precoding design and d) power allocation. Note that the estimate of the rate achieved by UE k in (15a) is computed by assuming that the m... |

90 | Networked MIMO with clustered linear precoding,”
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Citation Context ... by using CoMP schemes within the cluster, UEs at the cluster border suffer strong inter-cluster interference (ICI). Many clustering schemes have been developed in the literature to deal with ICI. In =-=[9]-=- static clustering with block diagonalization is considered and precoders are designed in each cluster by nullifying the interference towards UEs of neighboring clusters close to the border. A more fl... |

73 |
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Citation Context ...by the first results promising huge gains with respect to the baseline non-cooperative system [2], a lot of attention has been paid to the topic both in the academia [3], [4] and in the industry [5], =-=[6]-=-. These techniques, known in the industry as coordinated multi-point (CoMP), are classified into a) coordinated scheduling/beamforming (CS/CB), which require channel state information (CSI) but no dat... |

62 | Transfer of Channel State Information in Wireless Systems,”
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Citation Context ...g factor before the logarithm. Remark: Note that the assumption of perfect CSI at the UE in the considered system does not limit the value of the developed analysis. Indeed, it has already been shown =-=[25]-=-, [26] that in a similar setup the overhead required to obtain a reliable CSI at the UE is almost negligible when compared to the overhead necessary to acquire CSI at the BSs. This result is simply ex... |

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Citation Context ...the cell-edge [1]. Supported by the first results promising huge gains with respect to the baseline non-cooperative system [2], a lot of attention has been paid to the topic both in the academia [3], =-=[4]-=- and in the industry [5], [6]. These techniques, known in the industry as coordinated multi-point (CoMP), are classified into a) coordinated scheduling/beamforming (CS/CB), which require channel state... |

40 |
A dynamic clustering approach in wireless networks with multi-cell cooperative processing,” in
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Citation Context ...sidered and precoders are designed in each cluster by nullifying the interference towards UEs of neighboring clusters close to the border. A more flexible solution is obtained with dynamic clustering =-=[10]-=-, [11] where the set of clusters changes over time by adapting to the network conditions. In [10] a greedy algorithm is developed where, for each cluster, the first BS is selected randomly to guarante... |

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27 |
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Citation Context ...o deal with backhaul throughput constraints relies on partial sharing of UE data among the BSs, i.e., a BS serving a certain UE may have only a partial knowledge of the data to be sent toward that UE =-=[7]-=-, [8]. Although the promising results achieved under idealistic assumptions, partial UE data sharing has not found application in a real system mainly because of its complexity. Hence, most of the wor... |

22 |
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Citation Context ...puted from (15b) as P (c) = P (BS) max j∈Jc, ∑ k∈Sc lk−1∑ l=0 ∥∥∥[Gk,j]·,l ∥∥∥2 . (16) November 21, 2013 DRAFT 12 • Beamformers are designed by using the multiuser eigenmode transmission (MET) scheme =-=[31]-=-, where the precoding matrix used to serve UE k is optimized with the aim of nullifying the interference toward the eigenmodes selected for the co-scheduled UEs m ∈ Sc \ {k}. In detail, let Ĥ(c)k = U... |

21 |
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Citation Context ...r. In [17] a greedy scheduling algorithm with overlapping clusters is proposed where precoders are designed by considering the layered virtual signal to interference plus noise ratio (SINR) criterion =-=[18]-=-. However, most of the works on dynamic clustering ([10], [11], [12], [13], [16], [17]) assume that UEs are equipped with only one antenna, although the Long Term Evolution (LTE) Advanced standard dev... |

18 |
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Citation Context ...ctive clusters are selected by minimizing an overall cost function among a set of candidates which depend on UE average received power. A framework for feedback and backhaul reduction is developed in =-=[16]-=- where each UE feeds back CSI only to a subset of BSs, and UEs associated to the same subset are grouped together. In [17] a greedy scheduling algorithm with overlapping clusters is proposed where pre... |

13 | Joint scheduling and dynamic clustering in downlink cellular networks,” in
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Citation Context ...ceived power. A framework for feedback and backhaul reduction is developed in [16] where each UE feeds back CSI only to a subset of BSs, and UEs associated to the same subset are grouped together. In =-=[17]-=- a greedy scheduling algorithm with overlapping clusters is proposed where precoders are designed by considering the layered virtual signal to interference plus noise ratio (SINR) criterion [18]. Howe... |

12 |
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Citation Context ...or before the logarithm. Remark: Note that the assumption of perfect CSI at the UE in the considered system does not limit the value of the developed analysis. Indeed, it has already been shown [25], =-=[26]-=- that in a similar setup the overhead required to obtain a reliable CSI at the UE is almost negligible when compared to the overhead necessary to acquire CSI at the BSs. This result is simply explaine... |

9 |
Network MIMO with reduced backhaul requirements by MAC coordination,” in
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Citation Context ...d and precoders are designed in each cluster by nullifying the interference towards UEs of neighboring clusters close to the border. A more flexible solution is obtained with dynamic clustering [10], =-=[11]-=- where the set of clusters changes over time by adapting to the network conditions. In [10] a greedy algorithm is developed where, for each cluster, the first BS is selected randomly to guarantee Nove... |

7 |
A dynamic joint clustering scheduling algorithm for downlink CoMP systems with limited CSI,” in
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Citation Context ...in its coverage area, even UEs close to the border. Although a different choice could be taken for instance by forcing the cluster to serve only the UEs far away from the border, it has been shown in =-=[27]-=- that this alternative choice provides worse performance than (11) when a huge network is considered and fairness among the UEs is taken into account. Then, a solution to problem (5) is obtained by ap... |

6 | A decentralized framework for dynamic downlink base station cooperation
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Citation Context ...ecting, in each time block, the best one. In [12] the set of clusters is optimized by maximizing the increase in the achievable UE rate, whereas in [12], [13] by minimizing the interference power. In =-=[14]-=- a BS negotiation algorithm is designed for cluster formation by considering a fixed cluster size. In [15] active clusters are selected by minimizing an overall cost function among a set of candidates... |

6 | A practical cooperative multicell MIMO-OFDMA network based on rank coordination
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Citation Context ...tion may allow in the near-future manufacturing smartphones or tablets with numerous antennas and hence much more attention should be paid to the study of CoMP schemes with multiple antenna UEs [20], =-=[21]-=-. Therefore, in this work we consider downlink CoMP-JP with a constraint on the maximum cluster size and propose a novel dynamic clustering algorithm by explicitly considering that UEs are equipped wi... |

5 |
Coordinated Multi-Point in Mobile Communications
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Citation Context ...has been widely studied in the recent years to tackle inter-cell interference which strongly limits the rates achieved in cellular systems, in particular by the user equipments (UEs) at the cell-edge =-=[1]-=-. Supported by the first results promising huge gains with respect to the baseline non-cooperative system [2], a lot of attention has been paid to the topic both in the academia [3], [4] and in the in... |

5 |
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Citation Context ... joint clustering and scheduling scheme is developed by generating a set of candidate clusterings based on the long-term channel conditions and then by selecting, in each time block, the best one. In =-=[12]-=- the set of clusters is optimized by maximizing the increase in the achievable UE rate, whereas in [12], [13] by minimizing the interference power. In [14] a BS negotiation algorithm is designed for c... |

5 |
Multiple-antenna techniques in LTEadvanced,”
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(Show Context)
Citation Context ...with only one antenna, although the Long Term Evolution (LTE) Advanced standard developed by the 3rd Generation Partnership Project (3GPP) considers that UEs may be equipped with up to eight antennas =-=[19]-=-. Although this number seems a bit optimistic for current mobile devices, the technological innovation may allow in the near-future manufacturing smartphones or tablets with numerous antennas and henc... |

5 |
Multicell cooperative systems with multiple receive antennas,”
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Citation Context ...innovation may allow in the near-future manufacturing smartphones or tablets with numerous antennas and hence much more attention should be paid to the study of CoMP schemes with multiple antenna UEs =-=[20]-=-, [21]. Therefore, in this work we consider downlink CoMP-JP with a constraint on the maximum cluster size and propose a novel dynamic clustering algorithm by explicitly considering that UEs are equip... |

3 |
Constellation quantization in constrained backhaul downlink network mimo,” Trans on Comms
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Citation Context ...l with backhaul throughput constraints relies on partial sharing of UE data among the BSs, i.e., a BS serving a certain UE may have only a partial knowledge of the data to be sent toward that UE [7], =-=[8]-=-. Although the promising results achieved under idealistic assumptions, partial UE data sharing has not found application in a real system mainly because of its complexity. Hence, most of the works in... |

3 |
Self-organizing adaptive clustering for cooperative multipoint transmission
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(Show Context)
Citation Context ...ase in the achievable UE rate, whereas in [12], [13] by minimizing the interference power. In [14] a BS negotiation algorithm is designed for cluster formation by considering a fixed cluster size. In =-=[15]-=- active clusters are selected by minimizing an overall cost function among a set of candidates which depend on UE average received power. A framework for feedback and backhaul reduction is developed i... |

3 |
Optimal Wrap-Around Network Simulation
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Citation Context ...dB = (70/180)pi and As ∣∣ dB = 20 dB [33, (21.3)]. We consider an inter-site distance of 500 m and a minimum distance dmin = 35 m between BSs and UEs. Wraparound is used to deal with boundary effects =-=[34]-=-. We also assume that channels are correlated by considering the popular Kronecker model [35]. By denoting with RBS the square correlation matrix of size M at the BS, with tr(RBS) = M , and with RUE t... |

2 |
An improved dynamic clustering algorithm for multi-user distributed antenna system
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(Show Context)
Citation Context ...e long-term channel conditions and then by selecting, in each time block, the best one. In [12] the set of clusters is optimized by maximizing the increase in the achievable UE rate, whereas in [12], =-=[13]-=- by minimizing the interference power. In [14] a BS negotiation algorithm is designed for cluster formation by considering a fixed cluster size. In [15] active clusters are selected by minimizing an o... |

2 |
Backhaul network pre-clustering in cooperative cellular mobile access networks
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(Show Context)
Citation Context ...owever, this situation is unlikely when the number of BSs J is high, and a more realistic scenario considers a backhaul network with direct links only November 21, 2013 DRAFT 10 among neighboring BSs =-=[28]-=-. In such a case, the developed scheme properly adapts to the backhaul infrastructure and, for example, set C could be partitioned into subsets, each with a BS responsible for estimating the weighted ... |

1 |
Set covering, packing and partitioning problems,” Springer Encyclopedia of Optimization
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Citation Context ...t in [15] where the objective function simply depends on the received power measured by the UEs. Maximization (20) is the optimization version of the set packing problem, which is shown to be NP-hard =-=[32]-=-. Hence, as the exhaustive search is not a viable method to solve (20), we propose a greedy iterative algorithm which is reported in Tab. I: the proposed solution basically selects at each iteration t... |