Rate adaptation schemes in networks with mobile hosts

Abstract

This paper considers the problem of handoff management in an ht egrated Services Packet Network supporting mobfle hosts. h such a network, bks may become overloaded due to a high concentration of mobde hosts tithin a given ce~. As a restit. the required Qufity of Service guarantees cannot be provided to~flows in that cd. However. there Asts adaptive apphcations which can operate over a wide range of atiable bandwidth. Thus, it may be possible to overcome the %k overload condition by reducing the bandwidth of iudividurd flows, which we cd rate adaptation The two most important properties of a rate adaptation scheme are its network overhead and its fairness property. fite adaptation schemes which ensure certain fairness properties, such as m-in optirnrdity criteria, have very high network overhead. Therefore, these schemes are not suitable for a higtiy mobde environment where rate adaptation may have to be invoked frequently.k this paper, we investigate the tradeoff between the network overhead and the fairness property of rate adap tation in a mobde environment. We first characterize the fairness property of rate adaptation by severrd measurable parameters. We then describe two rate adaptation schemes, one of which h~~very low network overhead but is 'unfair', w~e the other scheme is 'fair' but has very high network overhead. Fmdy we propose a new rate adaptation scheme which recondes the two confecting properties. Resrdts of sirndation =periments comparing the performances of the three rate adaptation schemes are presented. 'This research work w= supported in part by DAWA rmder contract nnmbers DAAHOA95-1-0596and DAAG55-97-1-0322, NSF want numbersCCR 95-09620,IMS 95-09S16and Sponsorsof WI~AB.

Efficient QoS Provisioning for Adaptive Multimedia in Mobile Communication Networks by Reinforcement Learning

“…Two other schemes are used for comparisons, the guard channel (GC) scheme [1] and TBA98 [6]. In the GC scheme, a set of bandwidth is reserved permanently for handoff calls.…”

“…The performance of the proposed scheme has been evaluated by simulations. We have presented numerical results to show that the proposed scheme employing Q-learning outperforms existing schemes [1], [6].…”

“…There are several schemes in the literature addressing CAC and BA for adaptive multimedia services [6][7][8][9][10]. Authors in [6] study the tradeoffs between network overload and fairness in bandwidth adaptation.…”

“…Authors in [6] study the tradeoffs between network overload and fairness in bandwidth adaptation. However, the proposed scheme in [6] does not consider maximizing wireless network utilization and may result in sub-optimal solutions. A near optimal scheme is proposed in [7].…”

A new QoS provisioning method for adaptive multimedia in cellular wireless networks

“…The extension of these schemes that are designed for one traffic class to the case of multiple traffic classes in real cellular wireless networks may not be an easy task. Talukdar et al [8] studied the tradeoffs between network overload and fairness in BA for multiple classes of adaptive multimedia. A near-optimal scheme was proposed in [9].…”