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Point to multipoint multicast (MC) packets delivery without optimal distribution trees is prone to unnecessary retransmissions that adversely influences narrow-band VHF networks. The bandwidth efficient MC packet delivery path has to be calculated to best reach all destinations using the inherent broadcast nature of VHF radio subnets by avoiding retransmissions of the same message/packet in the same...
This paper investigates on novel effective schemes based on Device-to-Device (D2D) communications for data relaying, to upload content from a set of cooperating User Equipments (UEs) acting as sources of the data towards a cellular base station (eNodeB). Enabling factors of the resulting cooperative data uploading able to improve the system performance are: (i) the differentiated channel quality experienced...
In many applications need arises to connect a set of disjoint nodes or segments. Examples include repairing a partitioned network topology after the failure of multiple nodes, federating a set of standalone networks to serve an emerging event, and forming a strongly connected topology for a sparsely located data sources. Contemporary solutions for interconnecting these disjoint segments/nodes either...
Wireless mesh networks have seen a real progress due to their implementation at a low cost. Thus, the planning of such networks presents many challenges for network operators. Our aim in this paper is to provide a new planning solution using a multi-objective optimization approach.
Body Area Networks (BANs), targeting everywhere anytime health monitoring, operate in license-exempt frequency bands. They require a cross layer design that jointly considers the requirements of (1) access delay to the medium and (2) packet delivery ratio (PDR). In this paper, we experimentally evaluate the PDR of a BAN under static and dynamic scheduling schemes. Investigations show that static multi-hop...
This paper presents a supply concept for a two channel low side switch. The circuit is supplied from the input pins, each input supplying the corresponding channel. The topology presented in this paper selects the highest input voltage to supply common blocks. Simulations are used to observe the behavior of the switch.
The wide prospects of application of Underwater Acoustic Sensor Networks (UASNs), promoting the technology of UASNs. Network topological structure makes a strong impact on the throughput, power consumption and stability of network, wherefore it is important to optimize topological structure of network for UASNs. The underwater acoustic channel is characterized by limited bandwidth, lower communication...
For some applications in ad hoc networks optimal dissemination is a key issue (e.g. service discovery, network management). In this paper, we are creating and exploiting stable (sub-)structures to achieve an efficient (as far as low network resource usage is concerned) dissemination by building a two-layer protocol. Firstly, single-hop clusters, among stable-connected devices, are created. Secondly,...
The design/planning of WMNs is a key phase before any deployment. Few proposals can be found in the open literature that deals with the design problem; however, they do not take into account all the parameters that have an impact on the outcome of the design and they assume the existence of a physical topology where the location and the characteristics of nodes (e.g., number of channels, number of...
Wireless mesh networks (WMNs) have become a better alternative for extending wireless Local Area Networks (WLANs) to provide network coverage up to the furthest of far flung rural areas. This has been implemented by using a meshed backbone network interconnecting the mesh access points (MAPs) that manages each of the WLANs. The routing algorithms use the mesh backbone to establish inter-WLAN routes...
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