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Wireless multi-hop networks are scalable in that devices can easily connect to the network. Such scalability is also required in IoT. However, wireless multi-hop network mostly suffers from high probability of transmission failure due to interference, and nodes connected to the network often experience connection loss and subsequent segment loss which node mobility and routing update incur. Due to...
In-network guidance for off-path caching, called Breadcrumbs, has been proposed for cache networks. In Breadcrumbs, during content download, a router holds a pointer, breadcrumb, which denotes the latest download direction. When a content request occasionally encounters a breadcrumb along its default-path to the repository, location-based routing is switched to hop-by-hop breadcrumb-based routing...
Multi-hop relaying has been considered as a key technology for future wireless communication networks to overcome coverage and capacity problems in 5th generation mobile networks (5G). Recently, there has been increasing interest from 3GPP operators to integrate multi-hop relaying functionalities into LTE-A standards. However, many issues remain to be resolved due to the complexity of the multi-hop...
In a recent work, a regular grid-based network topology with multihop relaying was investigated. A transmission strategy which maximizes the throughput while exploiting the large propagation delay was presented, and the upper bound on throughput established. However, deployments of communication nodes in the ocean inevitably result in slight positional deviations from the expected locations of the...
The growth of customers in 3G network has forced the operators to always optimize their network performances. One of the most concerned parameters to indicate the quality of network is the interference area. Especially in 3G network, this parameter is directly influenced by the number of users. Hence, it would be better if the operators can predict the areas experiencing interference before getting...
Due to the directionality of transmissions in millimeter wave (mm-wave) networks, wireless stations are usually unable to overhear when other stations access the channel. This makes it hard to design efficient distributed beam coordination and scheduling mechanisms. At the same time, centralized schemes only perform well in relatively simple, static scenarios. In practical settings where links have...
While Western societies are becoming increasingly connected, many developing regions lack basic Internet connectivity, primarily due to the high costs associated with infrastructure deployment and maintenance. Potential exists for the TV white-space (TVWS) wireless technology to bridge this digital divide, though efficient channel access mechanisms suited to multi-hop networks that operate in sub-gigahertz...
This paper proposes a wired and wireless network cooperation (NeCo) system to quickly recover civilian telecommunication services in the aftermath of a catastrophic disaster. The proposed NeCo system achieves both rapid recovery and high throughput using wireless bypass routes backhauled by wired networks. With the NeCo system, active leaf nodes relay packets to and from dead leaf nodes whose wired...
Electromagnetic spectrum is a scarce resource. Spectrum licensing is estimated to consume about 20% of cellular operators' capital expenditure (CAPEX). One important measure of spectrum use is “spectral efficiency” (SE), which is the amount of data bandwidth that a specific technology can extract from a certain amount of radio spectrum and is measured in bits per second per Hz (bps/Hz). Using data...
This paper presents an analytical model for analyzing the performance of the TDMA-based distributed reservation protocol for wireless multi-hop ad hoc networks. A novel three-way handshake process is presented which considers the hold-off and competition process before the transmission of scheduling messages. An explicit expression of expectation of the average delay of the three-way handshake process...
The decisions of routing and scheduling in typical backpressure framework are actually made jointly, which hurts modularity and imposes difficulties in practice. In addition, the backpressure style routing and scheduling usually lead poor delay performance. This paper proposes a throughput utility maximization algorithm for multisession multihop wireless networks by applying the Lyapunov optimization...
Directional antennas have received much attention recently in multihop ad hoc networks, due to such benefits as increased transmission range, reduced co-channel interference, improved spatial reuse, and reduced susceptibility to jamming. However, existing random access scheduling schemes with directional antennas suffer from the issues of deafness and high probability of collisions. Moreover, such...
The adoption of licensed spectrum by unlicensed users creates an interest in Opportunistic Radio Networks (ORN) and dynamic spectrum access. However the licensed user (primary user) does not use the spectrum all the time. To utilize the spectrum which is not utilized by the primary user at a time, a secondary user (unlicensed user) can use the spectrum. The spectrum mobility will create an opportunity...
In the world of telecommunication, demand for 3G mobile communication services still dominates the global market. It continues to grow despite the introduction of new technologies such as LTE and LTE-A. Hybrid Automatic Repeat Request (HARQ) and Adaptive modulation and coding (AMC) are among the key performance enhancing techniques adopted in High Speed downlink packet access (HSDPA). Limiting the...
Wireless Sensor Networks (WSNs) have generated a great interest for industrial and have enabled new applications in different domains. In this paper, we present a PHY/MAC/Network analytic model for asymmetric multihop WSNs using the unslotted IEEE802.15.4 protocol and a weighted fair queuing (WFQ) scheduling that models the forwarding capability of sensors. This model can be used for cross-layer optimization...
We consider the problem of routing packets with end-to-end hard deadlines in communication networks. The problem is challenging due to the complex spatial-temporal correlation among flows with different deadlines. To tackle this challenging problem, we introduce the concepts of virtual links/routes to incorporate end-to-end deadline constraints into routing and propose a novel virtual queue architecture...
Multi-hop technologies are recently gaining momentum due to its integration with wireless internet, Transmission Control Protocol (TCP), a consistent self clocking transport protocol plays a decisive role in an Internet's performance as it carries huge quantum of internet data traffic globally. TCP's performance over multi-hop wireless networks remains a challenging concern because of its characteristics,...
Nowadays, with this diversity of Communication devices, the demand for accessing the spectrum is extremely increased. Cognitive Radio Network(CRN) improves the utilizing of the available spectrum efficiently and without it a considerable portion of the assigned spectrum is used intermittently. The geographical variations of using the assigned spectrum ranges remarkably with a high variance in time...
We consider multi-hop wireless networks serving multiple flows in which only packets that meet hard end-to-end deadline constraints are useful, i.e., if a packet is not delivered to its destination node by its deadline, it is dropped from the network. We design decentralized scheduling policies for such multi-hop networks that attain the maximum throughput of useful packets. The resulting policy is...
In wireless ad-hoc networks, multi-hop networks which relay packets over several relay nodes are employed. It enables us to telecommunicate and construct quick and easy networking without cabling. However, the throughput deteriorates with an increase of the relay nodes, because delay occurs at each relay node. To relieve this problem, a multi-hop network with node-skipping was proposed. In the practical...
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