[global] title "RACH request and channel allocation in GSM RAN" [entities] # define the entities in the system (in order) ms "MS" bts "BTS" bsc "BSC" [messages] # define the protocol messages in-order ms bts "RACH burst (8 bit payload)" bts bsc "RSL CHAN RQD (reason = RACH burst)" bsc bts "RSL CHAN ACT" bts bsc "RSL CHAN ACT ACK" bsc bts "RSL IMMEDIATE ASSIGNMENT CMD" bts ms "RR IMMEDIATE ASSIGNMENT"