Mobile Communication Lecture - 2 PDF

Mobile Communication Lecture - 2 1 Information Communication Technology How mobile communication works? Mobile phones communicate by using towers inside many cells networked together to cover large areas. The towers allow the transmission of data throughout the mobile pho...

Mobile Communication Lecture - 2 1 Information Communication Technology How mobile communication works? Mobile phones communicate by using towers inside many cells networked together to cover large areas. The towers allow the transmission of data throughout the mobile phone network. Each tower transmits within its own cell. If a person is making a call or sending a text to somebody in a different country, then satellite technology is used to enable the communication to take place. 2 Information Communication Technology Cont’d Mobile devices either use a SIM (subscriber identity module) card to allow it to connect to the mobile phone cellular network, or they use wireless internet connectivity. Together they allow all of the following features: SMS (short message service) messaging phone calls Voice over Internet Protocol (VoIP) communication video calling internet access. 3 Information Communication Technology SMS (text) messaging SMS or text messaging allows a very quick way of communicating with another person. Its advantage is that the other person does not need to be available, and can pick up the message as and when they want. Features of SMS includes: quicker and less expensive than making phone calls can be sent at any time of the day even if the recipient’s phone is switched off 4 Information Communication Technology Phone calls Mobile phones’ main uses are for making phone calls. Because mobile phones are so small and they have their own power source, they are an ideal way of keeping in touch anywhere, provided there is a network signal. Using mobile phones to make phone calls has the following advantages: There is no need to look for an operational public telephone in an emergency. It is possible to conduct business or personal phone calls on the move. It is easier to keep in contact with co-workers at the office no matter where you are. 5 Information Communication Technology Voice over Internet protocol (VoIp) and video calling One of the most common forms of internet telephony (that is, having a telephone conversation via the internet) is Voice over Internet Protocol (VoIP). It is a method used to talk to people using the internet. VoIP converts sound, picked up by the mobile device’s internal microphone, into discrete digital data packets that can be sent to their destination via the internet. The internet can be accessed via a mobile phone network or a broadband network and the voice calls are sent over the internet using VoIP technology. One of the big advantages is that phone calls themselves are free, no matter where in the world the caller and receiver are however there may be a cost to send lots of data over the internet via a mobile phone network. 6 Information Communication Technology Cont’d The advantages of using VoIP is that the device’s built-in cameras can also be used so that it becomes a type of video call. The main problems are usually sound quality Security is also a main concern with VoIP, as it is with other internet technologies. The most prominent security issues over VoIP are identity theft, viruses and malware, spamming (unwanted emails) and phishing attacks. Video calls permit: live video and audio chat screen-sharing during the call recording during sessions. 7 Information Communication Technology Internet Access Any mobile device can connect to the internet either using a wireless broadband connection or via the mobile phone network. Due to the use of smaller screens, internet pages displayed on mobile phones are often different to those on desktop or laptop computers. Software detects which type of device is connecting to a website, which then sends out the web page optimised for that device. Mobile devices also have a built-in feature which automatically selects wireless broadband connectivity (if possible), instead of the mobile phone network, when connecting to the internet. 8 Information Communication Technology Cont’d This gives following benefits: less expensive (mobile phone company ‘data plans’ often have a cap on how much data can be downloaded, and charge for exceeding this maximum) lower power consumption (Wi-Fi routers are usually much closer than the mobile phone towers; the longer the range, the greater the power consumption) quality of service (Wi-Fi usually offers greater bandwidth than the mobile phone network giving the possibility of downloading more data more quickly) 9 Information Communication Technology Definitions to learn! Malware: Malicious software Phishing: the act of sending an email to a user, falsely claiming to be an established legitimate enterprise, in an attempt to scam the user into surrendering private information that will be used for identity theft. 10 Information Communication Technology  Any Questions? 11 Information Communication Technology