Mobile Worldwide interoperability for Microwave access (WiMAX), IEEE 802.16e is a promising solution that provides ubiquitous wireless access with high data rates, high mobility and wide coverage. The main issue in mobile WiMAX networks is managing user mobility. Queues associated with the arriving packets should have enough bandwidth to meet the requirements; else the Handoff Call Dropping Pro...

Many logicians now think that in order to give a uniform solution to the paradoxes of self-reference one must revise logic by dropping one of the usual structural rules. To date almost all such approaches have focused on dropping structural transitivity or structural contraction, and have largely overlooked or ignored the prospects for resolving the paradoxes by dropping structural reflexivity....

We conduct simulations for the unsteady state anisotropic diffusion process in the human brain by discretizing the governing diffusion equation on a face-centered cubic grid and adopting a high performance differential-algebraic equation solver, IDA, to deal with the resulting large-scale system of DAEs. Incomplete LU preconditioning techniques are used with the GMRES method to accelerate the c...

Selective packet dropping policies have been used to reduce congestion and transmission of traffic that would inevitably be retransmitted. Common dropping policies proposed are drop-tail, partial packet discard (PPD), early packet discard (EPD) and their recent variations. However, depending on various circumstances, particularly in multi-hop networking environments, application throughput may ...

Adaptive RED (ARED) is an active queue management (AQM) designed for congestion responsive traffics such as TCP. ARED aims to keep average queue length around a predefined queue length. If so, average delay will be offered to Internet users and simultaneously high link utilization will be achieved. However, ARED algorithm merely makes the average queue length loosely converge to the target leng...

Losing VoIP packets or speech frames decreases the perceptual speech quality. The statistical relation between randomly lost speech frames and speech quality is well known. In cases of bursty and ratedistortion optimized losses, a precise quality model is required to relate losses to quality. In the present paper, we present a model that is based on the loss impact or the importance of single s...

Mobile computing has found increased applications and gained importance in the last decade. In modern cellular radio systems, the number of subscribers is likely to grow rapidly. Increasing the capacity of these systems, i.e., the number of users per unit area that can be managed at some predefined level of service quality is of vital importance. This paper proposes an Optimized blocking droppi...

Email: [email protected] Abstra t— A Distributed Dynamic Channel Assignment (DDCA) scheme, entitled UFDMA PDA PC has been developed which incorporates power control and which is designed to substantially reduce call dropping without the need for intra-cell handoffs. It has been shown that the scheme increases capacity by at least a factor of 3 compared with the best previous non power control U...