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Cognitive radio ad hoc networks (CRAHNs) emerge as a spectrum efficient networking technology to enable autonomous machine-to-machine communication among massive number of IoT devices. However, spectrum sharing results in opportunistic links and CRAHN becomes a kind of opportunistic networks. To reduce latency in CRAHN and to achieve overall spectrum efficiency by avoiding tremendous feedback signaling,...
How to improve the information diffusion coverage rate in socially-aware mobile networks has drawn great attention. To address this issue, the concept of the tie strength, the partial strength and the value strength were proposed in order to achieve a superior criterion for information diffusion. However, the previous works did not consider the existence of various patterns among the nodes in socially-aware...
Cognitive radio ad hoc network (CRAHN) is considered as a key technology to enhance the spectrum efficiency for diverse applications. However, due to the opportunistic links, the intrinsic randomness of the CRAHN makes the traditional precise control of the end-to-end transmission unscalable and generally infeasible. The recently-proposed virtual multiple-input multiple-output (MIMO) framework exploits...
Promising machine-to-machine (M2M) communication emerges to achieve ubiquitous communications among objects and the surrounding environment in everyday life. For a large M2M network to support scrupulous connections among abundant devices, sharing radio resource efficiently with the existing wireless networks while maintaining sufficient quality-of-service (QoS) for reliable communications becomes...
This paper proposed a routing protocol integrating both the characteristic of the flooding-based protocol and forwarding-based protocol. The basic idea of our protocol is to let message be forwarded to the nodes moving toward or closer to destination. When nodes contact with each other, our approach will utilize the path of the node, node's moving direction and velocity to estimate the probability...
In cognitive radio networking, the signal reception quality of a secondary user degrades due to the interference from multiple heterogeneous primary networks, and also the transmission activity of a secondary user is constrained by its interference to the primary networks. It is difficult to ensure the 1-connectivity of the secondary network, so we here characterize the connectivity of the secondary...
We study minimization of overall energy consumption of OFDMA systems, which are widely adopted in future wireless communications. Based on the existing resource allocation to minimize transmission energy, the computation energy increases due to the complexity of allocating algorithms. Since high performance algorithms usually have high complexity, there exist trade-offs between transmission energy...
Cognitive radio (CR) technology has been considered promising to enhance spectrum efficiency via opportunistic transmission at link level. To make CR useful, networking CRs to form a cognitive radio network (CRN) is able to support end-to-end transmission from CR source to CR destination. However, the opportunistic nature of CR link for interference avoidance to primary users degrades the quality-of-service...
It is well known that secondary users can take advantages of spectrum opportunities from primary users via cognitive radio technology. However, general sense cognitive radio networks allow all users to cooperatively relay the packets, especially primary users are aware of existence and activity of secondary users. Secondary users may act as cooperative relays for primary traffic. We propose a relay...
IEEE 802.16j is defining standards for Multihop Relay (MR) networks. With many low cost Relay Stations (RSs), a Base Station (BS) can diminish the radio range but extend the coverage by RSs. Besides, frequency can be reused in different RSs. When using real-time services in an 802.16j MR network, fixed bandwidth is allocated to each intermediate hop along the path between the MS and the MR-BS. The...
Spectrum sensing plays a critical role in cognitive radio technology that has been considered as the key to resolve spectrum shortage in future wireless communications. This paper introduces innovative ideas adopting statistical inference to obtain information at link level and network level of cognitive radio networks, beyond traditional detection and estimation techniques. Based on a novel spectrum...
IEEE 802.16 is defining standards for mobile multihop relay (MMR). The major purpose of MMR is to efficiently extend the coverage of a BS and to enhance the system throughput. Relay station (RS) has been introduced to fulfill this goal. However, packets in MMR would have a large probability of failure transmission because not all links over the multihop path are in good channel condition. Therefore,...
Cognitive radios (CRs) opportunistically sharing the wireless spectrum with the legacy primary system (PS) are promising to improve the spectrum utilization. However, this cognitive spectrum hole access makes the bandwidth of the cognitive radio network (CRN) formed by multiple CRs varies severely, which makes providing quality-of-service (QoS) guarantee over the CRN a very challenging task. Considering...
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