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The heterogeneity is one of the key characteristics of the future wireless networks. How to provide terminal users with the best connection anytime and anywhere become more important. In this paper, a vertical handoff decision algorithm for the heterogeneous wireless networks is proposed based on the Markov Decision Process (MDP). First the factors which determine the choices of the wireless networks...
The ever-increasing size of wireless networks poses a significant computational challenge for policy optimization schemes. In this paper, we propose a technique to reduce the dimensionality of the value iteration problem, and thereby reduce computational complexity, by exploiting certain structural properties of the logical state transition network. Specifically, our method involves approximating...
In this paper, we investigate the performance of an ALOHA random access wireless network consisting of nodes with and without RF energy harvesting capability. We develop and analyze a Markov model for the system when nodes with RF energy harvesting capability are infinitely backlogged. Our results indicate that the network throughput is improved when the conventional nodes are underloaded. On the...
Joint channel-aware and buffer-aware scheduling along with rate/power adaptation is a promising solution to assure Quality of Service (QoS) and improve energy efficiency. In this paper, an analytical delay-power tradeoff and optimal threshold-based scheduling are proposed. In particular, we are interested in the scheduling policies where the scheduler only needs to decide transmitting or not. More...
Secret key generation by extracting the shared randomness in wireless fading channel is a promising way to ensure wireless communication security. Previous works only consider key generation in static networks, but real-world key establishments are usually dynamic. In this work, for the first time we investigate the pairwise key generation in dynamic wireless networks with a center node (eg. access...
The distributed coordination function (DCF) may reduce the potential of network coding in 802.11 wireless networks. Due to the randomness of DCF, the coding delay, defined as the time that a packet must wait for a coding opportunity, may increase and degrade the network performance. In this paper, we study the potential impact of the coding delay in the performance of TCP over IEEE 802.11s infrastructure...
The performance metrics are very important for performance evaluation and system design. In the literature, their analyses are given only when the traffic with classical exponential distribution under time invariant channels. In this paper, using multidimensional Markov model, we analyze the performance of heterogeneous wireless networks with heavy tail traffic under the time variant channels. Some...
An enhanced medium access control (MAC) protocol for wireless networks with multi-packet reception (MPR) capability is proposed. The proposed protocol is based on the dynamic multi-group priority queueing protocol recently introduced to exploit the cooperative diversity for improving the system throughput. Two kinds of throughput losses, i.e., over-loaded loss and under-loaded loss, are defined first...
The network throughput and transport delay of a wireless random access network are studied in this paper based on a Markov renewal model of packet transportation. We show that the distribution of the source-to-destination (SD) distance plays a crucial role in characterizing the network performances. The necessary and sufficient condition on the SD-distance is established for scalable network throughput...
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