Coordinated multipoint: Concepts, performance, and field trial results

Irmer, Ralf; Droste, Heinz; Marsch, Patrick; Grieger, Michael; Fettweis, Gerhard; Brueck, Stefan; Mayer, H.P.; Thiele, Lars; Jungnickel, Volker

doi:10.1109/mcom.2011.5706317

Cited by 911 publications

(647 citation statements)

References 16 publications

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“…For each symbol x k , we have a probability vector p k , whose mth element P ( x k = a m |y) quantifies the current estimate of the nominal a posteriori probability (APP) 8 of having x k = a m , m ∈ [1, · · · , M ] upon receiving y, where a m represents the mth element of the modulation constellation alphabet A.…”

Section: Pda Based Soft Mudmentioning

confidence: 99%

Is the Low-Complexity Mobile-Relay-Aided FFR-DAS Capable of Outperforming the High-Complexity CoMP?

Yang

Alanis

et al. 2016

IEEE Trans. Veh. Technol.

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Abstract-Coordinated multi-point transmission/reception aided collocated antenna system (CoMP-CAS) and mobile relay assisted fractional frequency reuse distributed antenna system (MR-FFR-DAS) constitute a pair of virtual-MIMO based technical options for achieving high spectral efficiency in interference-limited cellular networks. In practice both techniques have their respective pros and cons, which are studied in this paper by evaluating the achievable cell-edge performance on the uplink of multicell systems. We show that assuming the same antenna configuration in both networks, the maximum available cooperative spatial diversity inherent in the MR-FFR-DAS is lower than that of the CoMP-CAS. However, when the cell-edge MSs have a low transmission power, the lower-complexity MR-FFR-DAS relying on the simple single-cell processing may outperform the CoMP-CAS by using the proposed soft-combining based probabilistic data association (SC-PDA) receiver, despite the fact that the latter scheme is more complex and incurs a higher cooperation overhead. Furthermore, the benefits of the SC-PDA receiver may be enhanced by properly selecting the MRs' positions. Additionally, we show that the performance of the cell-edge MSs roaming near the angular direction halfway between two adjacent RAs (i.e. the "worst-case direction") of the MR-FFR-DAS may be more significantly improved than that of the cell-edge MSs of other directions by using multiuser power control, which also improves the fairness amongst cell-edge MSs. Our simulation results show that given a moderate MS transmit power, the proposed MR-FFR-DAS architecture employing the SC-PDA receiver is capable of achieving significantly better bit-error rate (BER) and effective throughput across the entire cell-edge area, including even the worst-case direction and the cell-edge boundary, than the CoMP-CAS architecture.Index Terms-Base station cooperation, coordinated multipoint (CoMP), fractional frequency reuse, distributed antenna system (DAS), multicell uplink, mobile relay.

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Section: Pda Based Soft Mudmentioning

confidence: 99%

Is the Low-Complexity Mobile-Relay-Aided FFR-DAS Capable of Outperforming the High-Complexity CoMP?

Yang

Alanis

et al. 2016

IEEE Trans. Veh. Technol.

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“…In this context, the concept of BS cooperation is expected to tackle such excessive interference [6,7]. One form of BS cooperation is coordinated multipoint (CoMP) transmission, wherein the users' data is concurrently transmitted by multiple BSs in order to mitigate interference, and thereby improve the overall system performance [8,9].…”

Section: Introductionmentioning

confidence: 99%

Coverage and Rate Analysis for Location-Aware Cross-Tier Cooperation in Two-Tier HetNets

Guo

Cong

2017

Symmetry

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Heterogeneous networks (HetNets) are regarded as a promising approach to handle the deluge of mobile data traffic. With the co-channel deployment of small cells, the coverage and capacity of the network will be improved. However, the conventional maximum-received-power (MRP) user association scheme and cross-tier interference issue significantly diminish the performance gain provided by small cells. In this paper, we propose a novel location-aware cross-tier cooperation (LA-CTC) scheme for jointly achieving load balancing and interference mitigation in two-tier HetNets. In detail, we define an inner region for each macro base station (MBS) where the femto base stations (FBSs) will be deactivated, and thereby the users within the inner region will only be served by the MBS. Subsequently, for the users located in the outer region, the proposed scheme only uses coordinated multipoint (CoMP) transmission by two tiers of BSs to eliminate the excessive cross-tier interference suffered by offloaded users, whereas users with good locations are served directly by either a MBS or a FBS. Using tools of stochastic geometry, we derived the analytical expressions for the coverage probability and average rate of a randomly chosen user. Meanwhile, the analytical results were validated through Monte Carlo simulations. The numerical results show that the proposed scheme can improve the performance of networks significantly. Moreover, we compare the performance of the proposed scheme with that of the conventional MRP scheme, the cell range expansion (CRE) scheme and the location-aware cross-tier CoMP transmission (LA-CTCT) scheme in the literature. Numerical comparisons revealed that the proposed LA-CTC scheme outperforms the other three schemes.

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“…In the colocated scenario, closely-spaced antennas transmit the same information exploiting channel state information (CSI) to maximize the received signal-to-noise ratio (SNR) [8][9][10][11][12]. For the distributed beamforming scenario techniques such as coordinated multipoint (CoMP) joint transmission (JT) have been introduced and incorporated into the practical systems mainly to improve link reliability and data rate of cell-edge users [13][14][15][16][17]. The performance differences between beamforming methods may depend on the proposed limited feedback method, backhaul quality (especially in case of inter-site CoMP) and other implementation factors.…”

Section: Introductionmentioning

confidence: 99%

“…2. Backhaul To reach the expected performance, inter-site JT CoMP methods set strict backhaul capacity and latency requirements [15]. We note that the CoMP methods studied and incorporated in 3GPP release 11 assume ideal backhaul with infinite capacity and zero latency [13].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Hierarchically Combined Practical Beamforming Methods

Haile

Hämäläinen

2015

Wireless Pers Commun

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In literature various limited-feedback beamforming methods applied in co-located and distributed antenna systems have been proposed for enhancing wireless link spectral efficiency and reliability. We focus on practical limited-feedback methods and introduce a hierarchical feedback structure, whereby co-located/distributed transmit antennas are organized into two or more groups. To facilitate robust and flexible use of channel state information we apply independent feedback to antenna groups and between the groups. This structure provides additional implementation flexibility under practical constraints, particularly for coordinated multipoint (CoMP) systems. For the presented methods with hierarchical control structure, we compute closed-form expressions for the signal-to-noise power ratio gain, the fading figure and the average bit-error-probability. Although hierarchical structure leads in some cases to suboptimal methods, results show that performance loss against upper bound given by transmitter equal gain combining is negligible even when number of feedback bits is small. Thus, it is concluded that the hierarchical feedback that is robust against errors can be effectively used when antennas form natural groups like in e.g. CoMP transmission.

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Coordinated multipoint: Concepts, performance, and field trial results

Cited by 911 publications

References 16 publications

Is the Low-Complexity Mobile-Relay-Aided FFR-DAS Capable of Outperforming the High-Complexity CoMP?

Is the Low-Complexity Mobile-Relay-Aided FFR-DAS Capable of Outperforming the High-Complexity CoMP?

Coverage and Rate Analysis for Location-Aware Cross-Tier Cooperation in Two-Tier HetNets

Performance Analysis of Hierarchically Combined Practical Beamforming Methods

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