RRC connection re-establishment message and increase the probability for successful RRC connection re-establishment procedure. It should also be noted that timer T301 that supervises the RRC connection re-establishment procedure is started and stopped in exactly the same way as T300 for RRC connection setup procedure and therefore the T301 should be set equal to or longer than T300. Maximum Number of RLC Retransmissions in Uplink Is Reached The radio link failure can be triggered by the UE in case maximum number of RLC retrans- missions is reached in uplink and actions after radio link failure detection are the same as for T310 expiry scenario as shown in Figure 12.28. The maximum number of retransmissions is given in RRC connection reconfiguration messages for all AM RLC DRBs and in RRC con- nection setup message for SRB1. Typical value for AM RLC retransmission amount is 16 for DRBs and 2 for SRB1; increase of retransmissions to higher than 16 typically do not improve the dropped call rate further (as there are already 17 X 7 = 119 transmissions taking into account RLC and HARQ transmissions). The cause value used by the UE in RRC connection re-establishment message is the same as in the case of T310 expiry. LTE Key Performance Indicator Optimization 2. Detection of radio link failure (due max amount RLC retransmissions done): all RBs are suspended except SRBO, the UE Tx turned off in 40 ms, the UE initiates RRC 5. The UE acquires UL grant via random access re-establishment process and searches for the best cell. T311 procedure and physical layer sends RRC is started connection re-establishment request message 3. The UE finds suitable cell T311 running 6. The UE receives RRC connection 4. The UE acquired system information re-establishment message and timer 1. The UE continues RLC of the target cell. The UE layer 3 sends T301 is stopped. SRB1 is resumed retransmissions until max RLC retransmission count (threshold) is RRC connection re-establishment and layer 3 sends RRC connection reached (in this example mess