Self-Optimization of Spectrum Assignment and Transmission Power in OFDMA Femtocells

Bernardo, Francisco; Agustí, R.; Cordero, Jorge; Crespo, Carlos

doi:10.1109/aict.2010.14

Cited by 26 publications

(15 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The purpose of these schemes is to heuristically achieve the objective expressed in the optimisation problem in (12), and also keeping computational complexity at a very low level. The main difference between the SRM and ITA scheme is that the SRM scheme solves the same maximisation problem by binary integer programming with relaxation on the transmit power (transmit power is kept fixed).…”

Section: Proposed Resource Allocation Schemesmentioning

confidence: 99%

“…Thus, focusing on the HetNet scenario and on the SCAP-SCAP interference, [11] suggests that SCAPs should serve their users on sub-carriers with the least measured pilot signal strength from neighbouring SCAPs (hence the least SCAP-SCAP interference). Similarly, [12] proposes a technique where SCAPs assign the top best RBs to their users and adjust their transmit power subject to SCAP served users QoS constraints.…”

Section: A Related Workmentioning

confidence: 99%

“…The main maximisation objective is expressed in (12) and regarding the sum data rates for the small cell users c k,m,t is elaborated in (14) being a binary multiplier to ensure that if the control channel information is not decodable in a certain instance the data channel is also lost, since the control channel holds vital information to decode the data channel. Constraints in (13a) and (13c) express the binary nature of the φ muting variable for data and control channel respectively.…”

Section: Optimisation Problemmentioning

confidence: 99%

See 2 more Smart Citations

Control and Data Channel Resource Allocation in OFDMA Heterogeneous Networks

Saeed

Katranaras

Dianati

et al. 2015

J Sign Process Syst

View full text Add to dashboard Cite

This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division Multiple Access (OFDMA) Heterogeneous Networks (HetNets) consisting of macro cells and small cells sharing the same frequency band. Dense deployment of small cells overlaid by a macro layer is considered to be one of the most promising solutions for providing hotspot coverage in future 5G networks. The focus is to devise an optimised policy for small cells' access to the shared spectrum, in terms of their transmissions, in order to keep small cell served users sum data rate at high levels while ensuring that certain level of quality of service (QoS) for the macro cell users in the vicinity of small cells is provided. Both data and control channel constraints are considered, to ensure that not only the macro cell users' data rate demands are met, but also a certain level of Bit Error Rate (BER) is ensured for the control channel information. Control channel reliability is especially important as it holds key information to successfully decode the data channel. The problem is addressed by our proposed linear binary integer programming heuristic algorithm which maximises the small cells utility while ensuring the macro users imposed constraints. To further reduce the computational complexity, we propose a progressive interference aware low complexity heuristic solution. Discussion is also presented for the implementation possibility of our proposed algorithms in a practical network. The performance of both the proposed algorithms is compared with the conventional Reuse-1 scheme under different fading conditions and small cell loads. Results show a negligible drop in small cell performance for our proposed schemes, as a trade-off for ensuring all macro users data rate demands, while Reuse-1 scheme can even lead up to 40% outage when control region of the small cells in heavily loaded.

show abstract

Section: Proposed Resource Allocation Schemesmentioning

confidence: 99%

Section: A Related Workmentioning

confidence: 99%

Section: Optimisation Problemmentioning

confidence: 99%

See 1 more Smart Citation

Control and Data Channel Resource Allocation in OFDMA Heterogeneous Networks

Saeed

Katranaras

Dianati

et al. 2015

J Sign Process Syst

View full text Add to dashboard Cite

show abstract

“…Thus, focusing on the HetNet scenario and on the femto-femto interference, [12] suggests that FAPs should serve their users on RBs with the least measured pilot signal strength from neighbouring FAPs (hence the least femto-femto interference). Similarly, [13] proposes a technique where FAPs assign the top best RBs to their users and adjust their transmit power subject to FAP users QoS constraints.…”

Section: A Related Workmentioning

confidence: 99%

Dynamic femtocell resource allocation for managing inter‐tier interference in downlink of heterogeneous networks

et al. 2016

View full text Add to dashboard Cite

This paper investigates the downlink resource allocation problem in Orthogonal Frequency Division Multiple Access (OFDMA) Heterogeneous Networks (HetNets) consisting of macrocells and femtocells sharing the same frequency band. The focus is to devise optimised policies for femtocells' access to the shared spectrum, in terms of femtocell transmissions, in order to maximise femto users sum data rate while ensuring that certain level of quality of service (QoS) for the macro-cell users in the vicinity of femtocells is provided. The optimal solution to this problem is obtained by employing the well-known Dual Lagrangian method and the optimal femtocell transmit power and resource allocation solution is derived in detail. However, the optimal solution introduces high computational complexity and may not be feasible to apply in real-time systems. To this end, we propose a heuristic solution to the problem. The algorithms to implement both optimal and efficient suboptimal schemes in a practical system are also given in detail while their complexity is compared. Simulation results show that our proposed dynamic resource allocation scheme a) ensures the macro users QoS requirements compared to the Reuse-1 scheme, where femtocells are allowed to transmit at full power and bandwidth; b) can maintain femto user data rates at high levels, compared to the Orthogonal Frequency Reuse scheme, where the network bandwidth resources are partially divided amongst macro and femtocells; and c) provides performance close to the optimal solution, while introducing much lower complexity.

show abstract

“…Most of the solutions involve a joint optimization of the power allocation and the channel allocation or spectrum assignment. The authors in [11] proposed a self-organized framework of femtocells which autonomously perform the spectrum assignment and transmission power based on users' reported measurements. The study evaluated the gain in spectral efficiency and power consumption for the cases with and without macrocell interference.…”

Section: Introductionmentioning

confidence: 99%

Femtocell power control methods based on users’ context information in two-tier heterogeneous networks

Kurda

Boukhatem

Kaneko

2015

J Wireless Com Network

View full text Add to dashboard Cite

In this paper, we consider a two-tier macrocell/ femtocell overlaid heterogeneous network based on orthogonal frequency division multiple access (OFDMA) technology. Although the co-channel spectrum allocation provides larger bandwidth for both macrocell and femtocells, the resulting cross-tier interference may prevent macrocell users in the vicinity of femtocells to achieve their minimum required signal-to-interference plus noise ratio (SINR) in downlink. Therefore, we propose femtocell power control strategies for mitigating the interference experienced by macrocell users while preventing the femtocell throughput degradation. In particular, the proposed power control schemes make use of femto and macro users' context information in terms of positioning for setting the appropriate prioritization weights among the current victim macro users and the femto users in outage. System-level simulations show that our schemes enhance the throughput of macrocell users while maintaining a high performance for femtocell users compared to a conventional power allocation. Moreover, we show that the proposed prioritization weights allow to achieve the required level of macrocell/femtocell throughput trade-off.

show abstract

Self-Optimization of Spectrum Assignment and Transmission Power in OFDMA Femtocells

Cited by 26 publications

References 8 publications

Control and Data Channel Resource Allocation in OFDMA Heterogeneous Networks

Control and Data Channel Resource Allocation in OFDMA Heterogeneous Networks

Dynamic femtocell resource allocation for managing inter‐tier interference in downlink of heterogeneous networks

Femtocell power control methods based on users’ context information in two-tier heterogeneous networks

Contact Info

Product

Resources

About