Power headroom report-based uplink power control in 3GPP LTE-A HetNet

Kim, Soo Hyun; Kaleem, Zeeshan

doi:10.1186/s13638-015-0466-3

Cited by 17 publications

(16 citation statements)

References 11 publications

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“…e maximum value of M assigned by the scheduler to a user is limited by the system bandwidth and the power headroom of the user (i.e., the ratio between the maximum user transmit power and the UE transmit power per each PUSCH subframe, given by (1)) [30]. erefore, in this paper, it is assumed a specific UL scheduler implementation that stops allocating PRBs to a user if it estimates based on UE power headroom reports [31] that UE has reached its maximum transmit power.…”

Section: Fpc Algorithm For Puschmentioning

confidence: 99%

Analytical Model for Estimating the Impact of Changing the Nominal Power Parameter in LTE

Vallejo-Mora

Toril

Luna-Ramírez

et al. 2018

Mobile Information Systems

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UpLink Power Control (ULPC) is a key radio resource management procedure in mobile networks. In this paper, an analytical model for estimating the impact of increasing the nominal power parameter in the ULPC algorithm for the Physical Uplink Shared CHannel (PUSCH) in Long Term Evolution (LTE) is presented. The aim of the model is to predict the effect of changing the nominal power parameter in a cell on the interference and Signal-to-Interference-plus-Noise Ratio (SINR) of that cell and its neighbors from network statistics. Model assessment is carried out by means of a field trial where the nominal power parameter is increased in some cells of a live LTE network. Results show that the proposed model achieves reasonable estimation accuracy, provided uplink traffic does not change significantly.

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Section: Fpc Algorithm For Puschmentioning

confidence: 99%

Analytical Model for Estimating the Impact of Changing the Nominal Power Parameter in LTE

Vallejo-Mora

Toril

Luna-Ramírez

et al. 2018

Mobile Information Systems

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“…To avoid modeling internal walls, the simplified 3GPP indoor path loss model for FCs takes into account more of shadowing effect (e.g., standard deviation of 10 dB for a link between a UE and its sFCBS and 8 dB between a UE and all other interferer links) than any other models which consider an explicit modeling of internal wall penetration losses and a shadowing standard deviation of 4 dB. This simplified 3GPP indoor path loss model for FCs has been applied considerably in the existing literature Fading effect …”

Section: Interference Modeling Of Femtocell Network In 3‐dimensionalmentioning

confidence: 99%

A tractable analytical model for interference characterization and minimum distance enforcement to reuse resources in three‐dimensional in‐building dense small cell networks

Saha

Aswakul

2017

Int J Communication

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In this paper, we address mainly 2 important issues, namely, characterizing cochannel interference and enforcing a minimum distance between femtocell base stations (FCBSs) for reusing resources in FCBSs deployed in a 3-dimentional multi-floor building. Each floor is modeled as a group of square-grid apartments, with one FCBS per apartment. We propose a simple yet reasonable analytical model by using planar-Wyner model for intra-floor interference and linear-Wyner model for inter-floor interference modeling in a 3-dimensional multi-floor building to derive a minimum distance between co-channel FCBSs for optimization constraints, namely, link level interference, spectral efficiency, and capacity. As opposed to orthogonal resource reuse and allocation (ORRA) where resources are reused once, using the proposed model, we develop 2 strategies for reusing resources more than once, that is, non-ORRA, within a multi-floor building. An algorithm of the proposed model is developed by including an application of the model to an ultra-dense deployment of multi-floor buildings. With an extensive numerical analysis and system level simulation, we demonstrate the capacity outperformance of non-ORRA over ORRA by manifold. Further, with a fairly accurate yet realistic estimation, we show that the expected spectral efficiency of fifth-generation networks can be achieved by applying the proposed model to an ultra-dense deployment of FCBSs. KEYWORDS 3D, 5G, in-building, interference, minimum distance, resource reuse | INTRODUCTIONNetwork densification is one of the key enablers to achieve an expected capacity and spectral efficiency of fifth generation (5G) mobile networks 1 through reusing resources in small cells (SCs), such as femtocells (FCs). Reuse of resources in FCs relies on the inter-FC distance, which is a function of cochannel interference (CCI) generated from neighboring FCs. In urban environments, where an existence of thousands of 3-dimensional (3D) multi-floor buildings is an obvious scenario, modeling CCI and a minimum distance between FCs in 3D multi-floor scenario, for example, office buildings and residential areas, to address a high data rate demand of 5G networks have become one of the major growing concerns.Typically, interference in heterogeneous networks (HetNets) has been studied considerably in 2-dimensional (2D) scenario. 2 Modeling 2D interference is simple but not accurate enough for multi-floor buildings because it cannot capture complex combinations of deployment and propagation effect existing in realistic 3D multi-floor buildings. Authors in Ref. 2 investigated the impact of 3-dimensionality of FC deployments on cross-tier and co-tier interferences by using realistic building data, showed that the interference effect of FCs in urban 3D scenario is significantly higher than that when considering 2D case, and proposed to model HetNets in 3D scenario rather than 2D. Note that with 2D scenario, we infer that SCs, that is, FCs, are located within either closed indoor coverages, for example, a single-floored

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“…In order to reduce cochannel interference, various kinds of techniques have been considered in the literature, including our previously proposed dynamic frequency band allocation, by considering users' quality of service (QoS) priority among eNBs and FeNBs, group formation of FeNBs by exchanging information among neighboring FeNBs, power control (PC) approaches, and game theory‐based scheduling and femtocells clustering . Among all the previously proposed schemes, it has been noticed that cooperation between eNBs and FeNBs provides more benefits in terms of QoS, fairness, and load balancing, but at the cost of a little increase in feedback complexity in terms of sharing channel state information (CSI). Thus, in this paper, we consider cooperative communications or coordinated multipoint (CoMP) transmission, for capacity enhancement in interference‐limited cellular networks.…”

Section: Introductionmentioning

confidence: 99%

QoS priority‐based coordinated scheduling and hybrid spectrum access for femtocells in dense cooperative 5G cellular networks

Kaleem

Chang

2017

Trans Emerging Tel Tech

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A third-generation partnership project long-term evolution system uses the concept of a 2-tier heterogeneous network, where low-power and short-range femtocells are laid under macrocells to fulfill the quality of service (QoS) requirements of users and to boost overall network throughput. However, cochannel deployment gives rise to the problem of cross-tier interference that significantly deteriorates the performance of the cellular network. The coordinated multipoint (CoMP) transmission scheme is proposed as a promising solution to alleviate cross-tier interference by doing cooperation among the neighbor base stations. In this paper, we propose a QoS priority-based coordinated scheduling and hybrid spectrum access (QoS-CSaHSA) scheme for downlink CoMP transmission in 2-tier networks. The proposed QoS-CSaHSA scheme dynamically reduces the femtocells' power requirements by considering the neighbor cell interference, and it also balances the macrocell load by switching the femtocells to HA mode. Moreover, it can reduce unnecessary muting of the base stations because it only enables the coordinated scheduling CoMP when there is no other possibility to reduce the cross-tier interference. System-level simulation results prove the validity of the proposed QoS-CSaHSA scheme in a heterogeneous network environment. Compared with the existing schemes that operate the femtocells in a closed-subscriber group without considering users' QoS requirements, the proposed scheme almost doubles the cell-edge user throughput and reduces the packet loss rate and call-blocking probability.

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Power headroom report-based uplink power control in 3GPP LTE-A HetNet

Cited by 17 publications

References 11 publications

Analytical Model for Estimating the Impact of Changing the Nominal Power Parameter in LTE

Analytical Model for Estimating the Impact of Changing the Nominal Power Parameter in LTE

A tractable analytical model for interference characterization and minimum distance enforcement to reuse resources in three‐dimensional in‐building dense small cell networks

QoS priority‐based coordinated scheduling and hybrid spectrum access for femtocells in dense cooperative 5G cellular networks

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