We study the achievable rate region and optimal power allocation for broadcast channels (BC) under orthogonal access schemes. The channel follows a block fading model with channel side information (CSI) perfectly known at the receiver but not at the transmitter. The region boundary is determined by finding the optimal power allocation associated with all boundary points. For the two-user case, ...

Wireless services are one of the strongest growth areas in telecommunications today. Dynamic channel allocation schemes have garnered a considerable amount of attention as methods for achieving efficient use of system resources. Various combinations of permanent channel assignment, channel borrowing, shared pools of channels, channel ordering, channel reassignment, and dynamic adjustment of par...

Ever increasing growth in cellular mobile user population, coupled with scare radio spectrum has put stringent demand on optimization of channel utilization methodology. An efficient channel reuse scheme will ensure maximum availability of idle channels for new and handoff calls. In this paper we study fixed and dynamic channel allocation schemes. An attempt has been made to propose and evaluat...

In the last few years the issue of energy-efficient network design has gained increasingly more importance [1], [2], both in academia and in industry. Information and communication technologies (ICT) represent about 2% of the entire world’s energy consumption, and the situation is likely to reach a point where ICT equipments in large cities will require more energy than is actually available [3...

We propose a simple channel-allocation method based on tug-of-war (TOW) dynamics, combined with the time scheduling nonlinear oscillator synchronization to efficiently use of space (channel) and resources in wireless communications. This study demonstrates that groups, where each node selects different channel, are non-uniformly distributed phase such every distance between groups is larger tha...

Scheduling policies in multi-queue multi-server systems need to allocate servers based on the channel state information and the queue state information. In the downlink, channel state information available to the scheduler may be imperfect due to feedback delay and estimation errors. Motivated by this, we consider the downlink scheduling problem of allocating servers to multi-queue multi-server...

In this project we investigate the problem of channel allocation to a set of users in a centralized Cognitive Radio System. We consider three possible formulations of the problem and explain the relationship of these constraints to physical limiting factors. In the first formulation, we aim to minimize total power used in the system while fulfilling user rate requirements. This problem can be s...

Efficient channel allocation is important for meeting the quality of service (QoS) requirements of both GSM voice calls and GPRS packets in integrated GSM/GPRS networks. In this paper, we propose a new dynamic channel allocation scheme with guard channel, channel deallocation/re-allocation for voice call and packet queue for GSM/GPRS networks. An analytic model with general GPRS channel require...

In cellular mobile communication system the existing dynamic channel allocation scheme suffer from high blocking probability and forced termination probability. To mitigate this problem, in this paper we evaluated the performance of dynamic channel allocation scheme based on carrier-to-noise interference ratio. In our system model, uplink power strength from a call-initiating user to the base s...

The efficient use of the bandwidth allocated for a cellular wireless network is crucial for the satisfactory performance of the system. In order to increase the channel utilization, the channels are allocated to different cells in a dynamic way. The dynamic channel schemes can be categorized in to centralized and distributed. However, the centralized schemes are neither reliable nor scalable. T...