Chap 12. MAC(Media Access Control)

Chap 12. MAC(Media Access Control)

* Random Access Protocol (RAP) - ALOHA, CSMA/CD, CSMA/CA

* ALOHA - Tm * 2 -time out (Cnt max - abort)

* vulnerable time - Tfr * 2 

* Process volume - G(frame count) * e ^-2G

* slotted ALOHA - vulnerable time - Tfr

* Process volume - G(frame count) * e ^-G

* CSMA (carrier sense multiple access) 충돌 낮추고 성능 높이고

* 보내기 전 체크를 하는 것

* persistent -  1 non p

* CSMA/CD

* Tfr >= 2 * Tp

* 전통적 ethernet

* CSMA/CA

* wireless network

* difs cw rts sifs(cw) cts

* nav

* Control Access Protocol - Reservation, Pull/Select, token

* Channelization Protocol - Channelization 

* Channelization - fdma tdma cdma