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Bulk messaging is the dissemination of large numbers of SMS messages for delivery to mobile phone terminals. It is used by media companies, banks and other enterprises (for marketing and fraud control) [1] and consumer brands for a variety of purposes including entertainment, enterprise and mobile marketing.
Many types of common malicious programs are known to affect mobile devices: Expander: Expanders target mobile meters for additional phone billing and profit.; Worm: The main objective of this stand-alone type of malware is to endlessly reproduce itself and spread to other devices.
Since the Autumn of 2016, Wifi Calling / Voice over Wifi has been available for customers of Telenor Denmark, including the ability to do handover to and from the 4G (VoLTE) network. This is available for several Samsung and Apple handsets. AT&T [29] and Verizon [30] are going to launch Wi-Fi calling in 2015.
The main benefits for an end user are the following: "5 bar" coverage when there is no existing signal or poor coverage; Higher mobile data capacity, which is important if the end-user makes use of mobile data on their mobile phone (may not be relevant to a large number of subscribers who instead use WiFi where femtocell is located)
MIMO is often traced back to 1970s research papers concerning multi-channel digital transmission systems and interference (crosstalk) between wire pairs in a cable bundle: AR Kaye and DA George (1970), [5] Branderburg and Wyner (1974), [6] and W. van Etten (1975, 1976). [7]