tailieunhanh - Mobile & Wireless Networking – Lecture 3: Medium Access Control - Geert Heijenk

Outline of Lecture 3: Medium Access Control, Motivation, Basic Access Methods, Dynamic TDM / Random Access, CDMA, Comparison, Hybrid ARQ. Can we apply media access methods from fixed networks?   | 262001 Mobile Wireless Networking Lecture 3 Medium Access Control Schiller Chapter 3 Wikipedia Hybrid Automatic Repeat Request Geert Heijenk Mobile and Wireless Networking 2009 2010 Outline of Lecture 3 Medium Access Control Motivation Basic Access Methods Dynamic TDM Random Access CDMA Comparison Hybrid ARQ 2 Mobile and Wireless Networking 2009 2010 Motivation Can we apply media access methods from fixed networks Example CSMA CD Carrier Sense Multiple Access with Collision Detection send as soon as the medium is free listen into the medium if a collision occurs original method in IEEE Problems in wireless networks signal strength decreases proportional to the square of the distance the sender would apply CS and CD but the collisions happen at the receiver it might be the case that a sender cannot hear the collision . CD does not work furthermore CS might not work if . a terminal is hidden 3 Mobile and Wireless Networking 2009 .

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