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The LTE system that traditionally uses the licensed band have added the new technology, licensed assisted access (LAA), that enables to use 5 GHz unlicensed band with existing licensed band. Coexistence with Wi-Fi is major part of the LAA technology and regulations relating to coexistence has been revised after LAA technology emerged in Europe. Channel occupancy time (COT) is a critical parameter...
Nowadays the mobile radio technology is largely used to deliver Internet contents. Many studies to investigate techniques to use more efficiently the already assigned spectrum are currently on going at international level.
3GPP has been working in establishing a new network infrastructure based on unlicensed spectrum known as LTE Secondary Cell (SCell) in a carrier aggregation scenario in which LTE user terminals would still be anchored to an LTE Primary Cell (PCell) over licensed spectrum. On this scenario, best-effort content would be delivered on the unlicensed band SCell, while QoS traffic and control signaling...
Spectrum sharing mechanisms need to be carefully designed to enable inter-technology coexistence in the unlicensed bands, as these bands are an instance of a spectrum commons where highly heterogeneous technologies and deployments must coexist. Unlike in licensed bands, where multiple technologies could coexist only in a primary–secondary dynamic spectrum access mode, a spectrum commons offers competition...
Recently, there has been a tremendous increase in mobile data usage with widespread proliferation of smartphone like devices and increasing popularity of video streaming services such as YouTube. This is already causing overloading of 3G cellular access networks. It is estimated that even the 4G LTE (Long Term Evolution) technology which has significantly higher spectral efficiency than 3G will also...
The connectivity of the user equipment is one of the important thing that must be keep by the operator. To maintain this connectivity, operator should be smart to determine the network infrastructure that is low cost, easy, and fast to be implemented. To solve those connectivity problem, in this study will be designed an ad hoc mobile phone network. In an ad hoc network mobile phone which is built...
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