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This paper takes into account the uncertainty of the primary users' locations and transmission power in designing an optimal downlink scheduling scheme for cognitive radio cellular networks (CogCells). Localization technique is exploited to estimate the position and transmission power of the primary user (PU) transmitting on specific channel. The objective of our scheduling scheme is to maximize the...
It is undesired to drop an ongoing call in wireless systems; however, call dropping may occur in two situations, one of which is hand-off between cells in cellular wireless networks, the other of which is channel withdrawal in wireless systems with spectrum leasing. Channel reservation is a common solution to reduce the two types of call dropping. Optimal numbers of reservation channels were separately...
Rate control is an important issue for video streaming in cellular networks. This paper describes an equation based rate control for video streaming over cellular networks. In our method, the sending rate is calculated as a function of round trip time (RTT), loss event rate (p), packet size (s) and new control parameters alpha and beta that are able to provide flexible and smooth transmission rate...
We provide a simple and accurate analytical model for multi-cell IEEE 802.11 WLANs. Our model applies if the cell radius, R, is much smaller than the carrier sensing range, Rcs. We argue that, the condition Rcs >> R is likely to hold in a dense deployment of access points (APs). We develop a scalable cell level model for such WLANs with saturated nodes as well as for TCP-controlled long file...
In this paper we address the deployment of cooperation in a cellular CDMA environment. In particular, we consider the use of amplify and forward to increase the maximum number of users that can be assigned to each base station. In our scenario, a certain number of fixed relay stations are positioned within the cell: each of them is assigned a group of mobile terminals, whose transmissions are received...
Spectral efficiency, fairness and user satisfaction are crucial aspects for resource allocation in multi-user Orthogonal Frequency Division Multiplexing (OFDM)-based cellular networks. Classical Radio Resource Allocation (RRA) strategies, such as Max-Rate (MR), Proportional Fairness (PF) and Max- Min Fairness (MMF), show different performances regarding the three aforementioned aspects. In this work,...
Rate control is an important issue for video streaming in cellular networks. In this paper, we propose an equation based rate control and multiple connections for adaptive video streaming over cellular networks. In our method the sending rate is calculated as a function of round trip time (RTT), loss event rate (p), packet size (s) and new control parameters alpha and beta, that are able to provide...
Cooperative retransmission (CR) for cellular uplink employs recovery epochs where colliding packets are retransmitted until all packets are recoverable by the base station. We consider a general class of queueing dynamics, appropriate for cellular uplink MAC protocols, where time slots are grouped into epochs, and each epoch results in some subset of the active nodes completing a transmission to the...
In OFDMA cellular system, in order to get high spectral efficiency, the fractional power control scheme is always used in the uplink, which fractionally compensates the pass loss to the serving cell. Meanwhile, the inter-cell interference is the dominating interference of the OFDMA cellular system, which greatly degrades performance of the cell edge user. In this paper, we propose a novel uplink power...
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