Report of sa wg2 meeting #114

Discussion and conclusion:

Postponed TD S2 153736 from meeting #112. This LS was noted.

TD S2 160007 LS from RAN WG2: LS on V2X message characteristics. (RAN WG2) (Revision of TD S2 153738).
Abstract: RAN WG2 received from RAN WG1 the LS R1-155014 in which evaluation assumptions for LTE-based V2X are discussed. This working assumption given by RAN WG1 is motivated by the assumption that 300-byte size contains more security overhead than 190-byte size. RAN WG1 also agreed that the message generation periods of 100 ms and 500 ms are used to evaluate this periodic traffic case. RAN WG1 does not intend to make any implication on the details of the security design or packet size by this evaluation working assumption. RAN WG1 notes that small overhead is better from the physical layer performance perspective. RAN WG2 discussed the message size assumed by RAN WG1 and made the following conclusion: => RAN WG2 assumes that RAN WG1 will continue their work with the existing assumptions. RAN WG2 will continue to analyze L2 message overhead for V2X message size and will inform RAN WG1 accordingly. RAN WG2 will use the RAN WG1 working assumptions until then. The details of RAN WG1's working assumption are outside RAN WG2's work scope and competence. RAN WG2 seeks further guidance from SA WG1, SA WG2 and SA WG3 on the following specific questions: Question 1: Will any transport layer protocols be used for V2X services on either Uu and PC5 interface? And if yes, what is the corresponding size range of any transport level overhead? Question 2: Is there a need to define any 3GPP specific security mechanisms in addition to existing security protocols? Question 3: If the answer for Question 2 is affirmative, what is the corresponding size of any security overhead?. Action: RAN WG2 kindly asks SA WG2 to provide an answer to Question 1.