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Cellular technologies
Published in Matthew N. O. Sadiku, Optical and Wireless Communications, 2018
A typical cellular network is shown in Figure 7.3. It consists of the following three major hardware components:3Cell site (base stations) acts as the user-to-mobile telephone switching office interface, as shown in Figure 7.3. It consists of a transmitter and two receivers per channel, an antenna, controller, and data links to the cellular office. Up to 12 channels can operate within a cell, depending on the coverage area.Mobile telephone switching office (MTSO) is the physical provider of connections between the base stations and the local exchange carrier. MTSO is also known as mobile switching center (MSC) or digital multiplex switch-mobile telephone exchange (DMS-MTX), depending on the manufacturer. It manages and controls cell-site equipment and connections. It supports multiple-access technologies such as AMPS, TDMA, CDMA, and CDPD. As a mobile moves from one cell to another, it must continually send messages to the MTSO to verify its location.Cellular (mobile) handset provides the interface between the user and the cellular system. It is essentially a transceiver with an antenna and is capable of tuning to all channels (666 frequencies) within a service area. It also has a handset and a number assignment module (NAM), which is a unique address given to each cellular phone.
Communication Systems
Published in Trevor Linsley, Electronic Servicing and Repairs, 2014
A telephone handset contains a receiver, the ear piece and a transmitter for speaking into. The transmitter converts the pressure waves from the spoken word into analogue electrical signals, which are transmitted along conductors to the receiver of another handset which converts the electrical signals into sound waves. This provides the basis of a simple two-way communication system and a suitable circuit is shown inFig. 10.1.
Investigating the role of beliefs in influencing the hand-held and hands-free mobile phone use among pedestrians in India
Published in International Journal of Injury Control and Safety Promotion, 2023
Ankit Kumar Yadav, Sajid Shabir Choudhary, Nishant Mukund Pawar, Nagendra R. Velaga
Previous studies such as Sullman et al. (2018), Przepiorka et al. (2020) and White et al. (2010) have used the beliefs-based TPB approach to understand distracted driving behaviour. In this study, the belief model proposed by these researchers in the context of drivers was used after modifying it with respect to the pedestrians. Along with the demographic characteristics shown in Table 2, the survey captured the frequencies of mobile phone use of the pedestrians with respect to the type of handset (i.e., hands-free or hand-held whichever they prefer to use while walking) as shown in Table 3. The respondents were further classified into two categories: (a) frequent users (i.e., those with the frequencies of mobile phone use more than or equal to half of the time), and (b) infrequent users (i.e., those with the frequencies of mobile phone use less than half of the time).
Proactive management of customer relationship quality: an empirical investigation of mobile phone companies
Published in Journal of Decision Systems, 2019
Catalin C. Dinulescu, Lucian L. Visinescu, Victor R. Prybutok
According to DeRuyter, Moorman, and Lemmink (2001) the total offering of a supplier consists of the core product and peripheral services. In a mobile-phone firm context, we define the product as a mobile device (e.g. handset, smartphone, and tablet) offered and supported by the company. Our definition of services includes network services enabled by an active mobility subscription (e.g. call or data session initiation, continuance, and termination across company’s network); and customer services traditionally experienced through direct interactions with the firm (e.g. call centre, technical support). The role of offering quality consists in the evaluation of relationship alternatives based on comparison and cost/benefit analysis of various offerings. The availability of targeted offerings presenting favourable cost/benefit value leads to beneficial customer relationships.