LTE Network Enhancement for Vehicular Safety Communication

Table 1

Random access delay analysis.

Procedure	Detail	Total average delay
Random access (RA)	RACH subframe , 20 ms]	19 ms
	RAR window , 10 ms]
	RAR process [4 ms]
Contention resolution (CR)	Connection request [4 ms]	40 ms
	Connection setup , 64 ms]
	Connection setup process [4 ms]
Uplink resource allocation (UL)	Buffer status report [4 ms]	8 ms
	Uplink grant process [4 ms]