Cell and Cellular Traffic-I

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Cell and Cellular Traffic-I

Course UNIK4230
Title Cells and Cellular Traffic
Lecture date 2015/03/12 13:15 - 16:00
presented by Per Hjalmar Lehne
Objective Achieve a deeper insight in cellular traffic
Learning outcomes Understand the following topics:
  • Cell geometry
  • Frequency reuse
  • Co-Channel Interference
  • Co-Channel Interference Reduction
  • Cell Splitting
  • Coverage Area Estimation
  • Traffic Capacity and Trunking
  • Adjacent Channel Interference
Pensum (read before)
References (further info) References:
Keywords Cell, Frequency reuse, Co-channel Interference, Cell geometry, Fiber Optic Mobile, Microcell, Macrocell, Picocell, Cell Coverage, Link budget, Trunk, GOS, Erlang, CCI, ACI

this page was created by Special:FormEdit/Lecture, and can be edited by Special:FormEdit/Lecture/Cell and Cellular Traffic-I.

Test yourself, answer these questions

  • In a cell phone system what is a cell?
  • Why does the mobile phone cell have a hexagonal shape?
  • What is co-channel interference? How do I reduce it?
  • Prove that for a hexagonal geometry, the co-channel reuse ratio is given by Q=sqrt(3N), where N= i^2+ij+j^2.
  • A cellular service provider decides to use a digital TDMA scheme which can tolerate a signal-to-interference ratio of 15 dB in the worst case. Find the optimal value of N for omni-directional antennas, 120 degrees sectoring antennas and 60 degrees sectoring antennas. (Path loss exponent v = 4, number of interfering cells I = 6 (omni-directional antennas), I = 2 (120 sectoring) and I = 1 (60 sectoring).
  • What is Cell splitting and what benefits it brings? Where we should use smaller cell and where we should use bigger cell and why?
  • What is outage and how is it rated with fading?

Lecture 2015

Lecture 2014

Documentation from 2013

Documentation from 2012

Other info

Evolution of cells

From Macro to micro, pico and femto cells. Macro cells are used for coverage and fast moving objects (cars), micro cells are typically used for capacity, pico cells are cells for hot spots (train station, office building) and femto cells are for home/small office use.

Examples of Pico cells (also called metro cells)