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re use OF THE FREQUENCY FOR BETTER UTILIZATION

re use OF THE FREQUENCY FOR BETTER UTILIZATION

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  • Central ideas of cellular systems Small coverage areas (cells) Frequency reuse Handoff (not all mobile calls can be completed within a single cell) Cell splitting to increase capacity Cell radius depends on the propagation conditions and the network design : • ranges from few meters for indoor or microcellular networks to 10s of kilometers of rural service areas A basestation/network provides service for users by coordinating access (time slots, frequency channels, or codes) to channels Bandwidth (channels) is (are) split amongst a group of cells – called cluster • Cluster is repeated to cover a wider geographical area
  • In this the Cluster size is 7, N = I^2 +J^2+Ij I =2, J=1
  • The reuse distance D is given by the formula in yellow highlight, where D: Distance between center of co-channel (same frequency) cells R: Cell radious K: Cluster size Co-channel interference causes • Voice Channels: Loss of quality • Control Channels: Dropped calls Reduce co-channel interference by increasing distance between co-channels • Q = co-channel reuse ratio = D/R • Small Q increases system capacity (N is small) • Small Q increases co-channel interference (less distance between cells)

frequency re use nb frequency re use nb Presentation Transcript