Energy efficiency of downlink packet scheduling in CoMP

In this paper, the energy-efficient resource scheduling is investigated considering quality of service (QoS) constraints for OFDMA based heterogeneous network (HetNet). The energy efficiency (EE) is measured as "throughput (bits) per Joule", while the power consumption model includes RF transmit and circuit power (i.e. feeder loss, cite cooling, signal processing). Compared to existing literature on QoS aware method which mainly consider sum throughput or total transmission power as objective function for optimization, we investigate and model an optimization problem to maximize the EE subject to users' QoS requirements. Given QoS (data rate) requirement for maximizing EE, a constrained based optimization problem is devised. Since the optimization problem is non-convex in nature, we reconstruct the optimization problem as a convex one and devise a pragmatically efficient novel resource assignment algorithm for maximizing achievable EE with quick convergence. The considered optimization problem is transformed into a convex optimization problem by redefining the constraint using the cubic inequality satisfying certain conditions to prove non-negativity, which leads to the problem to be solve as a convex optimization method and results in an efficient iterative resource allocation algorithm. In each iteration, the transformed problem is solved by using Lagrangian dual decomposition with a projected gradient method. Analytical insights and numerical results exhibit the potency of the devised scheme for the targeted complex wireless systems. Our analysis also provides design guidelines for the future design and deployment of green wireless networks as approach the 5G era.

show abstract

“…The simulation platform is used for this work is explained in [25]. We conduct a numerical experiment to implement the iterative optimization.…”

Section: Numerical Resultsmentioning

confidence: 99%

QoS aware energy-efficient resource scheduling for HetNet CoMP

Huq

Mumtaz

Rodrı́guez

2015

2015 IEEE International Conference on Communications (ICC)

Self Cite

View full text Add to dashboard Cite

show abstract

“…In other works,– the authors have not considered the uplink real‐time scheduling and resource allocation framework for the demand of 3GPP LTE‐A networks. Thus, in this paper, the E‐rtPS with CT‐BMAP and proactive resource allocation framework are proposed (1) to use BSR to infer the state information of wireless channel and (2) to formulate a resource allocation framework as a combinatorial optimization problem to maximize the transmission rate of the networks.…”

Section: Related Workmentioning

confidence: 99%

Analyzing enhanced real‐time uplink scheduling algorithm in 3GPP LTE‐advanced networks using multimedia systems

Deebak

Ever

Al‐Turjman

2018

Trans Emerging Tel Tech

View full text Add to dashboard Cite

Third Generation Partnership Project (3GPP) standardizes the Long‐Term Evolution (LTE) to improve the quality of service in modern communication systems using 3GPP LTE‐advanced (LTE‐A) networks. As this technology is converging with modern devices, efficient resource allocation schemes are essential for minimization of the communication delay for the sensitive real‐time devices. To achieve the demands of latest technologies, this paper proposes two novel mechanisms, enhanced real‐time polling system with continuous time–batch Markovian arrival process and proactive resource allocation framework. The objective of the former mechanism is to improvise the service connectivity between the multimedia devices in LTE‐A networks and the latter is to exploit the transmission bits in each user's buffer in addition to the state information of wireless channel. The proposed mechanisms consider the constraints enforced by 3GPP standard in terms of radio resource blocks allocation for LTE‐A networks. In addition, the proposed mechanisms use LTE‐A networks to investigate the Voice over LTE traffic in order to analyze various quality‐of‐service measures, namely, sum throughput, session setup delay, packet delivery ratio, resource utilization ratio, and throughput improvement via real‐time multimedia client‐server systems. The probing results show that the proposed algorithm is superior in comparison to other typical services of IEEE 802.16d/e–based systems as well as LTE‐A system with 7 orthogonal frequency‐division multiplexing symbols over a duration slot 0.5 ms. While the slotted duration is set to 5 ms, the proposed framework effectively utilizes the resource allocation cycle to support the uplink scheduling to outperform at least 38% better throughput performance in comparison with existing mechanisms.

show abstract

“…Several LPNs, in this case RRHs, are connected to a Macro cell through optical fiber / microwave and the RRHs share same cell ID with eNB. There are multiple CoMP techniques, and joint transmission (JT) is considered as the most desirable choice in next generation Het-Net CoMP [33]. In the JT CoMP technique several transmitters serve one UE by transmitting similar signal content to the same resource.…”

Section: B Frame Allocationmentioning

confidence: 99%

Green HetNet CoMP: Energy Efficiency Analysis and Optimization

Huq

Mumtaz

Bachmatiuk

et al. 2015

IEEE Trans. Veh. Technol.

Self Cite

View full text Add to dashboard Cite

This paper investigates advanced energy-efficient wireless systems in orthogonal frequency division multiple access (OFDMA) downlink networks using coordinated multi-point (CoMP) transmissions between the base stations (BSs) in heterogeneous network (HetNet) which is adopted by 3GPP LTE-Advanced to meet IMT-Advanced targets. HetNet CoMP has received significant attention as a way of achieving spectral efficiency (SE) and energy efficiency (EE). Usually, in the literature, the total network power consumption is restricted to the sum of the power consumption of all BSs. In mobile networks, the backhaul contribution to the total power consumption is usually overlooked due to its limited impact compared to that of the radio base stations. For SE and EE analysis of HetNet CoMP, the energy and bandwidth consumption of the backhaul is considered without which the investigation remains incomplete. However, SE and EE are design criteria in conflict with each other and a careful study of their trade-off is mandatory for designing future wireless communication systems. The EE is measured as "throughput (bits) per Joule", while the power consumption model includes RF transmit, circuit and backhaul power. Furthermore, a non-ideal backhaul model such as Microwave link is also investigated within intra-HetNet-CoMP (inside one cell) where implementing fiber is not feasible. A novel inter-cell interference (ICI) coordination method is also studied to mitigate ICI. At the end, a novel resource allocation algorithm is proposed-modeled as an optimization problem-which takes into account the total power consumption, including radiated, circuit and backhaul power, and the minimum required data rate to maximize EE. Given the SE requirement, the EE optimization problem is formulated as a constrained optimization problem. The considered optimization problem is transformed into a convex optimization problem by redefining the constraint using cubic inequality, which results in an efficient iterative resource allocation algorithm. In each iteration, the transformed problem is solved by using dual decomposition with a projected gradient method. Simulations results demonstrate how backhaul has a significant impact on total power consumption and the effectiveness of the proposed schemes. In addition, the results demonstrate that the proposed iterative resource allocation algorithm converges with in a small number of iterations and illustrate the fundamental trade-offs between SE and EE. Our analytical results shed light on future "green" network planning in advanced OFDMA wireless systems such as envisioned for 5G system.

show abstract

Energy efficiency of downlink packet scheduling in CoMP

Cited by 17 publications

References 27 publications

QoS aware energy-efficient resource scheduling for HetNet CoMP

QoS aware energy-efficient resource scheduling for HetNet CoMP

Analyzing enhanced real‐time uplink scheduling algorithm in 3GPP LTE‐advanced networks using multimedia systems

Green HetNet CoMP: Energy Efficiency Analysis and Optimization

Contact Info

Product

Resources

About