The Experts below are selected from a list of 36 Experts worldwide ranked by ideXlab platform

Zaher Dawy - One of the best experts on this subject based on the ideXlab platform.

  • ISCC - On optimized joint uplink/Downlink resource Allocation in OFDMA networks
    2011 IEEE Symposium on Computers and Communications (ISCC), 2011
    Co-Authors: Ahmad M. El-hajj, Zaher Dawy
    Abstract:

    The emergence of new wireless technologies paved the way to the introduction of a new class of symmetric services with joint uplink/Downlink quality of service requirements. In this paper, we formulate joint uplink/Downlink resource Allocation in OFDMA networks as an optimization problem with total sum-rate maximization as an objective function. A regularization term is added to the problem formulation to account for the coupling between the uplink and the Downlink directions. This additional term controls the resource Allocation via the minimization of the per-user difference between the uplink and Downlink rates. We solve the formulated problem using dual optimization techniques. Performance results demonstrate the effectiveness of the proposed joint uplink/Downlink Allocation scheme compared to traditional single-link schemes.

Ahmad M. El-hajj - One of the best experts on this subject based on the ideXlab platform.

  • ISCC - On optimized joint uplink/Downlink resource Allocation in OFDMA networks
    2011 IEEE Symposium on Computers and Communications (ISCC), 2011
    Co-Authors: Ahmad M. El-hajj, Zaher Dawy
    Abstract:

    The emergence of new wireless technologies paved the way to the introduction of a new class of symmetric services with joint uplink/Downlink quality of service requirements. In this paper, we formulate joint uplink/Downlink resource Allocation in OFDMA networks as an optimization problem with total sum-rate maximization as an objective function. A regularization term is added to the problem formulation to account for the coupling between the uplink and the Downlink directions. This additional term controls the resource Allocation via the minimization of the per-user difference between the uplink and Downlink rates. We solve the formulated problem using dual optimization techniques. Performance results demonstrate the effectiveness of the proposed joint uplink/Downlink Allocation scheme compared to traditional single-link schemes.

Chee-onn Chow - One of the best experts on this subject based on the ideXlab platform.

  • Resource management for symmetrical applications over heterogeneous services in IEEE 802.16
    Wireless Networks, 2017
    Co-Authors: Wee Kiat New, Chee-onn Chow
    Abstract:

    Symmetrical applications are multimedia applications that require both uplink and Downlink connectivity. The demands of symmetrical applications are expected to grow rapidly in the future but there is still no resource management that can efficiently support symmetrical applications over heterogeneous services in IEEE 802.16 system. In this paper, we propose a resource management scheme that can support symmetrical applications along with heterogeneous services. The proposed scheme comprises of a joint uplink and Downlink Allocation, dynamic control system and bandwidth recycling framework. Simulation studies show that the proposed scheme outperforms asymmetrical scheme in terms of throughput, delay and packet loss. The proposed scheme also achieves similar performance gains in more complex environment.

  • Resource Management and QoS Provisioning for Duplex Services in IEEE 802.16
    Wireless Personal Communications, 2014
    Co-Authors: Chee-onn Chow, Maode Ma
    Abstract:

    Duplex services are multimedia services that requires good connectivity in both uplink and Downlink such as VoIP, video conferencing and interactive gaming. A weak connection in either direction may cause degradation of performances and dissatisfaction of user experience . Most researchers do not consider this issue and treat resource Allocations in uplink and Downlink independently. For this reason, the conventional resource management schemes do not guarantee a good duplex connectivity. Generally, duplex schemes require some relation or information to be exchanged between uplink and Downlink resource Allocation processes. The existing duplex resource Allocation schemes, however, have high complexity and do not adhere to the IEEE 802.16 standard. In this paper, we propose a duplex resource management scheme for IEEE 802.16 network to enhance the user experience and to improve the network performances. The proposed resource management scheme is a MAC layer function that co-relates the uplink and Downlink Allocation processes using a newly proposed duplex variable. Simulation studies show that the proposed scheme brings significant benefit to duplex services in the IEEE 802.16 networks and outperforms the conventional and existing schemes in terms of uplink and Downlink transmission gap, QoS performances and fairness.

Maode Ma - One of the best experts on this subject based on the ideXlab platform.

  • Resource Management and QoS Provisioning for Duplex Services in IEEE 802.16
    Wireless Personal Communications, 2014
    Co-Authors: Chee-onn Chow, Maode Ma
    Abstract:

    Duplex services are multimedia services that requires good connectivity in both uplink and Downlink such as VoIP, video conferencing and interactive gaming. A weak connection in either direction may cause degradation of performances and dissatisfaction of user experience . Most researchers do not consider this issue and treat resource Allocations in uplink and Downlink independently. For this reason, the conventional resource management schemes do not guarantee a good duplex connectivity. Generally, duplex schemes require some relation or information to be exchanged between uplink and Downlink resource Allocation processes. The existing duplex resource Allocation schemes, however, have high complexity and do not adhere to the IEEE 802.16 standard. In this paper, we propose a duplex resource management scheme for IEEE 802.16 network to enhance the user experience and to improve the network performances. The proposed resource management scheme is a MAC layer function that co-relates the uplink and Downlink Allocation processes using a newly proposed duplex variable. Simulation studies show that the proposed scheme brings significant benefit to duplex services in the IEEE 802.16 networks and outperforms the conventional and existing schemes in terms of uplink and Downlink transmission gap, QoS performances and fairness.

Emmanouel Varvarigos - One of the best experts on this subject based on the ideXlab platform.

  • SCVT - Ensuring fair Downlink Allocation in modern access networks: The XG-PON framework
    2013 IEEE 20th Symposium on Communications and Vehicular Technology in the Benelux (SCVT), 2013
    Co-Authors: Panagiotis Sarigiannidis, Georgios I. Papadimitriou, Petros Nicopolitidis, Emmanouel Varvarigos
    Abstract:

    The fairness aspect on handling user data flows in modern broadband telecommunication networks is of paramount importance since it strongly affects the quality of the provided services. In this work, the fairness provisioning is investigated in a competitive telecommunication field such as the passive optical networks (PONs). Intending to resolve unequal resource Allocation in the downstream data delivery, a fair bandwidth assignment scheme is devised and evaluated. The Max-Min fairness concept is applied in order to determine the best effort (BE) bandwidth Allocation of each optical network unit (ONU) in the optical line terminal (OLT) side. Simulation results indicate the benefits of utilizing the proposed resource Allocation technique in terms of fair bandwidth distribution.