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We formulate and study a multi-user multi-armed bandit (MAB) problem for opportunistic spectrum access (OSA) that exploits the temporal-spatial reuse of PU channels so that SUs who do not interfere with each other can make use of the same PU channel. We propose a three-stage distributed channel allocation policy for OSA, where SUs collaboratively find an optimal channel access grouping, and independently...
In order to solve the problem of spectrum and power allocation for D2D communication in cellular networks when the prior knowledge is not available, a method based on machine learning is proposed in this paper. Q-learning, which is one of the most important algorithms in machine learning, is proposed to solve the radio resource management in underlay mode to find the optimal strategy in time series...
A joint channel assignment and power allocation algorithm is presented for cognitive wireless networks, where primary and secondary users operate over the same frequency band at the same time. In this study, we take into consideration a constraint on the interference from secondary users towards primary users, as well as a constraint on the QoS of secondary users. The problem is formulated as a constrained...
Two evolutionary algorithms are proposed in this paper to handle with access point channel assignment in Wireless Local Area Network. The objective considered is to minimize the maximum level of interference experienced by the users. Two deterministic heuristics, commonly employed in the considered problem, are used as benchmark. The paper is focused on the IEEE 802.11ac standard, which operates exclusively...
Underlaying device-to-device (D2D) communication links to a cellular network is a promising way to improve spectrum efficiency, for which the cross- link interference should be carefully controlled. Resource allocation has been widely utilized for managing interference in D2D networks. However, most previous works made simple assumptions by either ignoring the reliability requirement of D2D links...
In this paper, we propose a prediction algorithm for dynamic channel allocation amongst coexisting Wireless body area networks (WBANs). Variations in channel assignment due to mobility scenarios within each WBAN as well as the movement of WBANs towards each other is investigated. The proposed scheme is further optimized to allocate the optimum transmission time with synchronous and parallel transmissions...
Channel interference and node mobility cause significant performance degradation to wireless networks. In multichannel multi-flow mobile cognitive ad hoc networks, it becomes even worse due to both unexpected primary user activities and potential interference among multiple flows. In this paper, we propose a Joint Routing and Channel Assignment (JRCA) approach based on delay prediction. Firstly, it...
The demand for wireless communication in enterprise network has been increasing with the advent of "smart working environment." In enterprise wireless network, high density of access points (APs) and limited frequency resources raise the significance of radio resource management. In this paper, we propose a centralized algorithm, named JACPoT, for jointly executable transmission power control...
Non-orthogonal multiple access (NOMA) with successive interference cancellation (SIC), is considered as a candidate multi-user access scheme for 5G cellular systems. In this paper, we provide theoretical insights and solution algorithm for optimizing multi- user power and channel allocation in NOMA systems. We mathematically formulate the NOMA resource allocation problem and prove its NP-hardness...
IEEE 802.11a protocol provides 12 non-overlapping channels. If nearby nodes operate on the same frequency channel, they can interfere with each other and produce congestion in the logical links. The use of Multi-Radio, Multi-Channel (MR-MC) can provide more coverage area due to multi-hop forwarding and offer more capacity by simultaneously operating on multiple radios. In this paper, we propose a...
Satellite and terrestrial integrated mobile communication systems (STICS) is proposed to construct economical and highly-reliable communication networks. One of the promising approaches to share the frequency spectrum in STICS is dynamic spectrum assignment, which dynamically divides the spectrum into two parts according to the traffic demand of terrestrial service and satellite service. As smaller...
Dynamic channel assignment is a promising solution for flexible and efficient spectrum utilization in a satellite/terrestrial integrated mobile communication system (STICS), that uses multi-beam satellite and share the frequency spectrum allocated to mobile satellite services with terrestrial mobile services. This paper proposes a location based centralized dynamic channel assignment with channel...
In this paper the authors extend the tests and model verification related to the partially overlapped channel interference in Wi-Fi communications. Recently more and more papers have investigated the side effects of the channel interference on the throughput parameter. The paper proposes a theoretical model and an experimental approach to obtain useful information regarding channel allocation and...
The design of a wireless network is often critically affected by issues such as determining the optimal density of Access Points (APs) and optimal channel assignment by exploiting partially overlapped channels (POCs) for significantly improving the network performance in terms of maximizing the overall network capacity. Contemporary research works have traditionally dealt with these two problems in...
We develop a new framework for designing robust cognitive radio networks using white channels. Our framework assigns white channels to wireless links and provisions spare channel capacity that will used in the event of channel preemption. We characterize the optimal white channel assignment that minimizes the spare capacity while guaranteeing survivability against white channel preemptions.
One fundamental issue in supporting multi-cell ultrahigh throughput wireless local area networks (WLAN) is how to coordinate inter-cell interference. In this paper, we present a novel max-min fair resource allocation scheme to increase system capacity and improve the communication quality of cell-edge users. We assume the users within one cell operate on orthogonal frequency channels, while users...
IEEE 802.19.1 coexistence system provide two types of coexistence service: information service vs. management service. Information service provides radio environment information that enables 802.11af APs to facilitate channels with its neighbor APs. Each AP determines its operating parameters by itself to mitigate interference using the information. On the other hands, with management service, coexistence...
Heterogeneous Networks (HetNets), where Low Power Nodes (LPN) are deployed under the coverage of Macro Base Stations (MBS), are promising to boost the spectrum efficiency per unit area. However, this hierarchical architecture also brings new problems, like severe inter-cell interference. The randomly deployed LPNs, and the co-existence of the cross-tier and intra-tier interference make it challenging...
This paper investigates the inter-operator spectrum sharing problem in the local area indoor dense deployment scenario. A system framework is designed and function of each entity is discussed for solving this problem. Also a spectrum sharing strategy is developed based on the proposed architecture. This strategy improves the spectrum efficiency by offering each femtocell the opportunity to use the...
In multiple hops network, there would be competition among the Peer to Peer (P2P) links when the amount of the P2P links was large. This paper proposed a novel dynamic channel allocation (DCA) algorithm based on ant colony intelligence (ACI) to solve the problem of multi-hop network competition among the P2P links. Theory analysis showed than the shorter of the average length of the routes of the...
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