Co‐channel interference in two‐tier heterogeneous networks: analytical model and ergodic capacity

Cloud radio access networks (C‐RANs) have been proposed as promising solutions to increase both the spectrum and energy‐efficiency performances in the fifth generation wireless communication systems. Many published works have discussed the concrete implementation technology to justify the huge development potential of C‐RAN. However, few litterateurs focused on characterising the cell association in the uplink. In this paper, we study the cell association techniques in uplink C‐RAN systems. Three received power based cell association techniques, namely the single best, N‐best and N‐th best, are presented and analysed. To characterise the random deployment of remote radio heads (RRHs) with multiple antenna configuration, stochastic geometry is used to evaluate the proposals' ergodic capacity, and the corresponding closed‐form expressions are derived. For the received power based cell association techniques, both analytical and simulation results demonstrate that the ergodic capacity gain from an increase in RRH density is larger than that of increasing the number of antennas per RRH. Copyright © 2014 John Wiley & Sons, Ltd.

show abstract

“…Therefore, the uplink capacity of the N-th best RRH selection strategy can be further expressed as (13) C NthBest…”

Section: Single N-th Best Rrh Associationmentioning

confidence: 99%

Investigation of cell association techniques in uplink cloud radio access networks

Yan

Wang

Zhao

et al. 2014

Trans. Emerging Tel. Tech.

View full text Add to dashboard Cite

show abstract

“…Meanwhile, the coincident utilisation of the fourth SB simultaneously among the adjacent Femtocell C and Femtocell F has created destructive co‐layer interference, which negatively affected the performance of both FUE C and FUE F . Because of the unpredictable and uncoordinated deployment of femtocells, the spatial distribution of femtocells becomes one of the major factors that affect the co‐layer interference among these small cellular networks . Notice that there will be no interference created between Femtocell C and Femtocell D , although the same SBs are reused at both cells simultaneously.…”

Section: System Model and Problem Formulationmentioning

confidence: 99%

“…L w a l l is the wall penetration loss, and d 2 D , i n d o o r is the total distance inside the house/houses. In , the path loss analysis is alternatively modelled as a function of d and the path loss exponents whose value is normally in the range of 2 to 4.…”

Section: System Model and Problem Formulationmentioning

confidence: 99%

“…Practically, the installations of eNBs are managed by the network operators after a careful network planning, whereas the installations of HeNBs are performed by the customers in unplanned manner . Therefore, the issue of cross‐layer and co‐layer interference in HetNets becomes inevitable especially when the random and uncoordinated deployment of autonomous femtocells is operated in closed‐access policy.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A demand‐based spectrum orthogonalisation scheme for interference avoidance in LTE‐Advanced heterogeneous networks

Maharum

Fisal

et al. 2014

Trans. Emerging Tel. Tech.

View full text Add to dashboard Cite

Successful deployment of femtocells within a macrocell coverage area would be hindered if cross‐layer and co‐layer interference in such heterogeneous networks (HetNets) is not properly mitigated. Through spectrum management, cross‐layer interference between macrocell and femtocell network layers can be avoided by assigning the network layers with orthogonal spectrum bands. However, the orthogonal spectrum assignments in prior works are no longer effective because they may not guarantee the variation of users' traffic demand in HetNets to be satisfied all the time. Therefore, a centralised and dynamic orthogonal spectrum assignment called demand‐based spectrum orthogonalisation (DeBaSO) is proposed in this paper to address the interference issues in downlink of LTE‐Advanced HetNets. In our proposed scheme, the problem of orthogonal spectrum assignment is formulated with the objective to maximise the overall system throughput based on the requirement of physical spectral resources to satisfy the users' traffic demand. Additionally, the co‐layer interference among femtocells is avoided by grouping the adjacent femtocells into different femtocell clusters. To do so, typical model of spatial frequency reuse is exploited in this paper. In this way, femtocells that are grouped within the same cluster can universally reuse the assigned spectrum resource without creating co‐layer interference among them. Numerical results indicate that the proposed scheme achieves a remarkable performance in terms of overall system throughput and spectrum efficiency because the cross‐layer and co‐layer interference is entirely avoided. The achievements prove that DeBaSO scheme overcomes the limitations found in other orthogonal spectrum assignments, which were previously proposed in the literature. Copyright © 2014 John Wiley & Sons, Ltd.

show abstract

“…To improve performances in the indoor scenario, femtocells with the distributed antenna system (DAS) are presented in [4]. The outage probability was evaluated for the vertical spectrum reuse among floors in a building [5], in which only one BS per floor with a single antenna was considered. Unfortunately, to our best knowledge, few works have studied the coverage performance for downlink HSCNs in dense K -floor indoor scenario.…”

Section: Introductionmentioning

confidence: 99%

Downlink heterogeneous small cell networks with cell associations in K-floor indoor scenarios

Yan

Peng

Chen

et al. 2015

2015 IEEE International Conference on Communication Workshop (ICCW)

Self Cite

View full text Add to dashboard Cite

To support the unrelenting demand of services with gigabit data rates in indoor scenarios, a dense heterogeneous small cell network (HSCN) is presented as a promising paradigm for the fifth generation system. In this paper, the coverage probability for the downlink HSCN with three cell association methods, namely the nearest association, the N -th nearest asso ciation and the maximum received power based association, is analyzed. Particularly, small cell base stations SCBSs randomly deployed in each floor are modeled as a spatial Poisson point process (PPP) distribution, and the stochastic geometry tool is used to evaluate the coverage probability. Different from the traditional outdoor scenario, the penetration loss is considered and the corresponding impact on the coverage probability is analyzed. The closed-form expressions of coverage probability for these three association methods are derived for HSCNs in the dense K -floor indoor scenarios. Simulation results validate the accuracy of our analysis and show that the coverage performance for the maximum received power based association method is much better than that of the N-th nearest association method regardless of the SCBS density in each floor. Meanwhile, the nearest association approaches the the maximum received power based association method when the SCBS density is high.

show abstract

Co‐channel interference in two‐tier heterogeneous networks: analytical model and ergodic capacity

Cited by 16 publications

References 23 publications

Investigation of cell association techniques in uplink cloud radio access networks

Investigation of cell association techniques in uplink cloud radio access networks

A demand‐based spectrum orthogonalisation scheme for interference avoidance in LTE‐Advanced heterogeneous networks

Downlink heterogeneous small cell networks with cell associations in K-floor indoor scenarios

Contact Info

Product

Resources

About