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In this paper, it is proposed an algorithm to allocate resource blocks for Long Term Evolution (LTE) communication systems where it is taken into account the maximum delay guarantee and Modulation and Coding Scheme (MCS) restrictions of the downlink transmission. The proposed algorithm considers the channel quality and the delay target value for each user in order to decide on the scheduling of available...
Presented in this paper is a dynamic BW allocation based on the energy, delay and BW for the community WD-Mand-OFDM-combined passive optical network (COMWOP) architecture. The performances of proposed architecture and algorithm are simulated and evaluated.
We consider the real time transmission of scalable multimedia data with a constrained end-to-end Quality of Service. In the Rayleigh channel case, the resulting optimization problem is solved by the Flexible Transmission (FT) algorithm. This resources allocation strategy allows to transmit the sole layers with guaranteed QoS at the receiver. Here, we propose to extend the FT method to the OFDM case...
Resource allocation issues are considered in this paper for multiuser orthogonal frequency-division multiple access (OFDMA). This paper proposes a sub channel and power-allocation algorithms to provide the quality-of-service (QoS) requirements for each user. The resource allocation problems are non-convex, Because of their non-convex nature, there is no guarantee that solution obtained is to be optimal...
The paper proposes the improvements for Max C/I Ratio method, which is used in the LTE downlink. These improvements resolve problem of the resource scheduling in the situation where some user with high SNR uses all available resources. We propose to operate with composed type 0 type 1 resource allocation methods. The general goal is to increase user experience by managing resource block scheduling.
Future wireless communication systems beyond 2020 will demand diverse requirements on system design that supports a wide range of data rates in overcrowded networks. This paper presents a physical (PHY)-layer system design for ultra-dense network (UDN) with multirate transmission. This proposed scheme transmits user data over highly fragmented spectrum which implies efficient spectrum utilization...
Worldwide Interoperability for Microwave Access (WiMAX) and Wireless LAN (WLAN) has emerged as a promising solution for last mile access technology to provide high speed internet access in the residential as well as small and medium sized enterprise sectors. Application Response Time is the key performance measure in WiMAX and WLAN Network Quality of Service (QoS). The WiMAX network does not provide...
This paper strives to improve the energy efficiency (EE) of wireless systems by resource allocation for delay sensitive traffic with the statistical quality of service (QoS) requirement, where a delay bound and a small violation probability is ensured. To avoid wasting energy when serving random traffic, we turn the QoS exponent, a key parameter to characterize statistical QoS guarantee under the...
Resource allocation in Orthogonal Frequency Division Multiplexing (OFDM) system with mixed traffic is studied in this paper. The sub-carriers and power of a base station (BS) are allocated to users to maximize energy efficiency, which is measured by utility per Watt. We model the allocation of sub- carriers and power as a mixed integer nonlinear programming (MINLP) problem, which is computationally...
Carrier Aggregation (CA) is one of the promising techniques to support the wider bandwidth and fulfil the higher data rate requirement in LTE-Advanced system. Combined with Cognitive Radio (CR), the packet scheduler is more intelligent to assign the radio resources dynamically. To the best of our knowledge, Carrier Scheduling (CS) scheme in the cognitive LTE-A system with CA has not thoroughly been...
In this paper, we address the energy conservation problem with the quality of service (QoS) requirements taken into account for the physical downlink shared channel (PDSCH) in LTE/LTE-Advanced networks. By jointly allocating the modulation and coding schemes (MCS), resource blocks (RB), and power, we first propose a standards-compliant QoS-oriented power control algorithm (SQPC) for realistic systems...
Energy efficiency is becoming more and more important to the development of wireless communication. In this paper, we study energy-efficient resource allocation in an Orthogonal Frequency Division Multiplexing (OFDM) system with mixed traffic. Considering both the energy efficiency and spectral efficiency, we model the allocation of sub-carriers and power as a mixed integer nonlinear programming (MINLP)...
In this paper, by jointly considering subchannels, power, and Modulation and Coding Scheme (MCS) allocation, we address the sum-rate maximization problem in OFDMA downlink systems. We formulate the problem as an integer linear programming (ILP), which maximizes the system sum-rate subject to the minimum rate requirements of users and total transmit power constraint of base station. To solve the formulation...
Energy efficiency is becoming an increasingly important topic in green communications. In this paper, we study the energy-efficient utility-based resource allocation in an orthogonal frequency division multiple access (OFDMA) network with heterogeneous services. We propose energy-efficient utilities for various services describing the user satisfaction per energy consumption for transmission. An effective...
New PHY and MAC layer enhancements have been introduced in different IEEE 802.11 WLAN standards. These improvements have given birth to a wide range of bandwidth channels (up to 160MHz) and very high transmission data rates (> 1Gbps) to keep up with current and up-coming multimedia applications. The major reason for the inefficiency of different WLANs is that the current MAC layer randomly allocates...
This paper studies the resource allocation for orthogonal frequency division multiple access (OFDMA) relay system with a single source node, multiple relay nodes and multiple destination nodes. Joint subcarrier allocation and relay selection problem with different Quality of Service (QoS) requirements on destination nodes is transformed to the maximum weight matching problem in a bipartite graph....
Energy efficiency has currently become one of the central topics in today's wireless communication industry. In this paper, we focus on the energy-efficient design in downlink multi-user MIMO-OFDM systems, so as to optimize the energy efficiency with users' quality of service (QoS) guarantees. Particularly, an optimization problem concerning power allocation is formulated, where the objective is the...
Recently, broadband wireless communication serves as one of the most growing and developing technology in the field of telecommunications. The broadband provides multimedia services for voice, video, High Definition TV (HDTV), and games with certain Quality of Service (QoS). For these services, a high data transmission is greatly needed. Worldwide Interoperability for Microwave Access (WiMAX) Network...
In modern days, users in the wireless networks are increasing drastically. It has become the major concern for researchers to manage the maximum users with limited radio resource. Interference is one of the biggest hindrances to reach the goal. In this paper, being deep apprehension of the issue, an efficient dynamic channel borrowing scheme is proposed that ensures better Quality of Service (QoS)...
Energy-efficient communication has attracted more and more attention due to the large energy consumption in wireless communication network. Relay-assisted OFDM cellular network is one of the most effective frameworks in the IMT-Advanced system to improve the spectral efficiency. This paper investigates the energy-efficient resource allocation for multiuser two-way multi-relay OFDM network. We formulate...
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