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Friday, 20 January 2017

IPU BCA Semester 6 - Mobile Computing - Impact On Mobile Computing Design and Functionality

Impact On Mobile Computing
Design and Functionality

Mobile Computing 
IPU BCA Semester 6 - Mobile Computing - Impact On Mobile Computing Design and Functionality



Question: What is the impact on mobile computing devices design and functionality in the following context?
(a) Power Consumption
(b) Device Vulnerability
(c) User Interface
(d) Memory


Answer: While design a functionality for a mobile device, one need to consider the various aspects, such as

(a) Power Consumption:
- Mobile computing devices generally have limited battery capacity
- Due to limited power supply, its computing power is also limited.
- It also has impact on size of display screens.
- Due to lower power supply, there are fewer input-output (I/O) device options.



(b) Device Vulnerability
- Due to small size, mobile devices can easily get stolen.
- It requires more rugged design as these computing devices have to diverse withstand weather conditions, speed bumps, screen scratches due to rings and key-chains in the bags.


(c) User Interface
- Small display size often compromises with limited user experience.
- Keyboard size is small and often there are typos due to fat finger problem.
- Integrating voice recognition system is a challenge


(d) Memory
- Memory size is limited due to size and power constraints.
- Secondary Memory can be expanded to some extent.


Question: Define Mobile Computing. Name any two technology trends gaining popularity due to mobile computing?

Answer: The process of computation on a mobile device is called mobile computing. It is the ability to use the technology to wirelessly connect to other small, portable, and wireless computing and communication devices.
Technology trends associated with mobile computing are:

1. Location aware applications. Mobile devices recognize the location of the user and react accordingly.
2. Integration of wireless networks into existing fixed network environments. e.g. 3G and TCP/IP integration.


Question: Define channelization. List the three protocols of channelization.

Answer: Channelization is a multiple-access method in which the available bandwidth of a link is shared in time, frequency or through code among different stations.
Three commonly used protocols of channelization are:

  • FDMA
  • TDMA
  • CDMA


FDMA or Frequency Division Multiple Access: It is the division of frequency band allocation for wireless cellular telephone communication into 30 channels. Each channel can carry a analog conversation or digital data. FDMA is a basic technology in analog systems. With FDMA, each channel can be assigned to only one user at a time.

TDMA or Time Division Multiple Access: This technology is used in digital cellular communication that divides each cellular channel into three time slots to carry more data in each slot. It shares single frequency among multiple users. TDMA is widely used in 2G cellular systems and satellite systems.

CDMA or Code Division Multiple Access: This is channel access method which uses mulplexing technique to allow numerous signals occupying a single communication channel. It optimizes the bandwidth and widely used in third generation (3G) wireless communication.




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