Adaptive QoS for wireless multimedia networks using power control and smart antennas

Abstract

Abstract-This paper addresses the problem of adaptive quality-of-service (QoS) for mobile multimedia services under a power controlled wireless network using smart antennas. Given the nature of multimedia, we chose the signal-to-interference and noise ratio (SINR) of each user's channel as the QoS index. We direct our attention toward two problems. The first is to increase the SINR levels for multimedia users as much as the system can provide for, under the channel fading and interference conditions. Different users have distinct desired SINR levels according to their requested service types; our algorithm uses an iterative method to drive the SINR levels as close as possible to those desired levels. The SINR levels are improved without deteriorating quality for other types of users. Simulations presented here show a significant increase in the average SINR levels for multimedia users. The second problem considered in this paper, is how to speedily initiate new users into the network by using lower complexity algorithms that yield reliable results. As shown in the simulations, our fast activation scheme can substantially reduce the time for activating new users into the system.

A low-complexity joint power control and beamforming algorithm for the downlink of multi-user W-CDMA coordinated systems

“…Several works have analyzed the influence of the spectral radius in different optimization problems. For example, reference [6] evaluates the gradient of the spectral radius in order to modify its value. In [7], a geometrical interpretation of the feasibility of the power minimization problem is provided for the uplink of a 2-users single-cell system.…”

Combined fuzzy-based power control with window-based transmission rate management in multimedia CDMA cellular systems

“…In [9], the authors combined SPC with the active link protection (ALP) scheme to maintain a minimum transmission rate for each user while minimizing the number of rate changes by smoothing the realized SIR s. A problem of how to control the transmission rates for maximizing system throughput while simultaneously minimizing the transmission powers was studied in [10]. In [11], the authors proposed adaptive QoS for wireless multimedia networks using power control and smart antennas. They showed that this method significantly increases the average SIR levels for multimedia users.…”

VISUALISE: Enhancing the spectator experience

“…Quality of Service (QoS) is vital when streaming video over wireless networks [1][2] [3]. In this paper we present a practical implementation of an advanced and robust wireless audiovisual system.…”