Performance of Stop & Wait ARQ

• Without frame xmission errors & Tack = 0

  U = Tf / ( Tf + 2 __)
  
  U = 1/ (1 + 2a) where a = _ / Tf

• With frame probability error = P & Tack = 0

  U = Tf / Nretrans(Tf + 2 __)
  
  U = 1/ Nretrans(1 + 2a)
  Nretrans = _ i P i-1(1-P) = 1/ (1 - P)
  
  U = (1 - P)/ (1 + 2a)

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