Real parameters: timer values, cause codes, message IEs

3GPP Timer Reference Values

Critical NR timer values protocol test engineers must know: T300 (RRC connection setup) default 1000 ms, T301 (RRC reestablishment) default 1000 ms, T304 (handover) default 100 ms, T310 (RLF detection) default 1000 ms, T311 (RLF recovery) default 1000 ms. NAS timers: T3510 (registration request) 15 seconds, T3511 (registration retry) 10 seconds, T3512 (periodic registration update) 54 minutes, T3521 (deregistration) 15 seconds. HARQ RTT is 4 slots minimum in NR. These values directly affect call setup time, handover reliability, and failure recovery speed.