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In this paper, we consider a disruption tolerant network (DTN) which enables data transmission with intermittent connectivity and in which instantaneous end-to-end path between a source and destination may not exist. We explore routing problems in such networks in consideration of limited storage for each intermediate node. A graph model called the storage enhanced time-varying graph (STVG) is presented,...
In this paper, we characterize the transmission capacity region (TCR) in D2D integrated cellular networks when two prevalent interference management techniques, power control and Successive Interference Cancellation (SIC) are utilized. The TCR is defined as the enclosure of all feasible sets of active transmitter intensities in cellular and D2D systems. Closed-form approximate expressions of TCR are...
Channel allocation has become a significant challenge in multi-channel Ad-Hoc networks due to the fast growing of wireless applications and the limitation of spectrum resource. In this paper, we assume that the demand of each user is different and alterable, which has been known by all the others. We study the problem of demand-aware channel allocation (DaChA) from a non-cooperative strategic game...
In cognitive radio networks, the available vacant frequency bands, referred to as spectrum holes, are usually discontinuous. Hence, it is hard to exploit these vacant frequency bands since the bandwidth of single one may not be able to meet the wide bandwidth requirement of secondary users (SUs). Spectrum aggregation (SA) enables SUs to access several discontinuous spectrum holes simultaneously to...
Dynamic spectrum sharing plays a critical role in cognitive radio for the efficient spectrum utilization. In this paper, we consider a cooperative spectrum leasing model, in which the primary user (PU) may lease part of its bandwidth to the secondary user (SU) in exchange for the cooperation to maximize its power saving, under the constraint that its target is guaranteed. In return, the SU can take...
Current schemes of radio resource allocation for LTE Networks can be summarized as either the centralized or the distributed. In this paper, a hybrid multi-resource allocation scheme is presented from a network overall performance perspective, where evolved NodeBs (eNBs) are motivated to assist users to implement the joint bandwidth scheduling and power water-filling on the physical resource block...
Network coding is known to be a promising technology to increase the bandwidth capacity in wireless networks. To our best knowledge, there is limited work on studying the available bandwidth for a given path with network coding. This paper presents a new method to estimate the available bandwidth of a path that considers network coding and wireless interference simultaneously. We show that our estimated...
In this paper, we propose a new path metric for finding the maximum available bandwidth path in the multiradio multi-channel wireless mesh networks. We formally prove that the path metric is isotonic, which is the necessary and sufficient condition for assuring the proper operation of the routing algorithm. Based on the metric, we develop a routing protocol which jointly considers the path selection...
This paper discusses the problem of computing the maximum available bandwidth of a given path in TDMA-based network with network coding, which is a fundamental issue for supporting QoS with bandwidth requirement in wireless networks. We present a new path bandwidth computation mechanism considering physical-layer network coding. To our best knowledge, our work is the first proposal on assigning time...
We capture both the economical and technical aspects of the dynamic spectrum sharing to improve the underutilization of the scarce but valuable radio spectrum and the service providers' revenue. Especially, we investigate the optimal mapping between the service requester pool (SRP) and the service provider pool (SPP) in the coexistence context of multiple heterogenous cognitive radios. Both the optimal...
In this paper, a resource management approach based on IEEE1900.4 architecture for heterogeneous wireless network is given. The rest of the paper is organized as follows. In Section II, the radio resource management approach consisting inter-network resource allocation, RAN resource reservation and access network selection in heterogeneous network is present.
In this paper, we focus on the bandwidth allocation and reallocation scheme which uses multimode wireless access networks to guarantee the QoS of streaming services. The utility function for streaming service is proposed, which characterizes the rate adaptation and handoff delay in heterogeneous network scenario. The utility function for network provider takes into account the number of serving end...
According to the demand of the Doppler frequency shift estimation under low signal-noise-ratio (SNR) conditions, the stochastic resonance (SR) technique from the nonlinear science is applied to signal pre-processing and a novel algorithm with the level crossing rate (LCR) estimation is proposed in this paper. Theoretical derivation demonstrates the proposed algorithm can effectively improve SNR and...
In cognitive radio system, secondary users should have capability of detecting the signal from primary user to evade interfering harmfully with any primary receiver. The duration used for spectrum sensing influences the performance of secondary user system. In this paper, we show disadvantages of one threshold judgment in cognitive radio spectrum sensing. For improving this defect, we propose a double...
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