BDC5eChapter14 - Chapter 14: Wireless WANs Business Data...

Info iconThis preview shows pages 1–9. Sign up to view the full content.

View Full Document Right Arrow Icon
Chapter 14: Wireless WANs Business Data Communications, 5e
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Business Data Communications, 5e 2 Reasons for Wireless Networks Mobile communication is needed. Communication must take place in a terrain that makes wired communication difficult or impossible. A communication system must be deployed quickly. Communication facilities must be installed at low initial cost. The same information must be broadcast to many locations.
Background image of page 2
Business Data Communications, 5e 3 Problems with Wireless Networks Operates in a less controlled environment, so is more susceptible to interference, signal loss, noise, and eavesdropping. Generally, wireless facilities have lower data rates than guided facilities. Frequencies can be more easily reused with guided media than with wireless media.
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Business Data Communications, 5e 4 Cellular Wireless Networks One of the most revolutionary developments in telecommunications Supports users in locations that are not easily served by wired networks Used for mobile telephones, personal communications systems, wireless Internet and wireless Web applications, and more
Background image of page 4
Business Data Communications, 5e 5 Cellular Network Organization Uses multiple low-power transmitters ( 100W) Areas divided into cells, each one served by its own antenna. Each cell allocated a band of frequencies, and is served by a base station Adjacent cells are assigned different frequencies to avoid interference or crosstalk Cells sufficiently distant from each other can use the same frequency band
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Business Data Communications, 5e 6 Cellular Geometries
Background image of page 6
Business Data Communications, 5e 7 Frequency Reuse Patterns
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 Increasing Capacity Adding new channels Frequency borrowing: Frequencies are taken from adjacent cells by congested cells Cell splitting: Cells in areas of high usage can be split into smaller cells. Cell sectoring: Cell divided into wedge-shaped sectors. Each sector is assigned a separate subset of the cell's channels, and directional antennas at the base station are used to focus on each sector. Microcells: Useful in city streets in congested areas,
Background image of page 8
Image of page 9
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/27/2010 for the course BAMU BSC taught by Professor Kmm during the Spring '10 term at University of New York in Prague.

Page1 / 33

BDC5eChapter14 - Chapter 14: Wireless WANs Business Data...

This preview shows document pages 1 - 9. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online