Osama Kubbar

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— Long Term Evolution (LTE) supports closed-loop MIMO techniques to improve its performance, but in order to exploit multiuser MIMO channel capabilities, the design of an efficient MAC scheme that supports Multiuser MIMO is still an open issue in the literature. This paper proposes a novel energy efficient MAC scheme for LTE, which aims to achieve(More)
In OFDM wireless networks, the radio resources are assigned to the users based on their quality of service needs and depending on their channel quality. Thus, during a call session, the bandwidth requirements and needed radio resources may increase from negotiated call setup resources. In this study, we propose a call admission control reservation algorithm(More)
Distributed base stations are studied in the framework of LTE public safety networks. In the proposed model, users are connected to remote radio heads deployed throughout the cell and connected to a central base station. In this paper, resource allocation for the purpose of real-time video transmission, in the uplink and downlink, is investigated, and the(More)
—We extend vehicular cooperation into downlink LTE-A networks in what we call Infrastructure-to-Relaying-Vehicles (I2RV) cooperation. In I2RV, vehicles are used as relaying terminals between eNodeB/BS and a receiving user equipment located or mounted on another traveling vehicle, for the aim of extending coverage, improving performance, and attaining(More)
One of the radio resource management (RRM) functionalities in LTE systems, call admission control (CAC) is employed to control the number of LTE bearer requests in order to maintain the quality of service (QoS) of the admitted bearers. However, no quality guarantee can be provided due to the inherently dynamic nature of wireless communication. For example,(More)
—In this paper, we propose a bandwidth adaptation mechanism for 3GPP LTE which partially releases bearers' resources for admission of a new bearer during congestion periods. Each active bearer may contribute into the downgrading mechanism up to its minimum resource requirement according to a bearer contribution attribute called the " downgrading index ".(More)