dure is performed, the UE prioritizes uplink transmission over any V2X sidelink transmission irre- spective of the sidelink MAC PDU's PPPP [6]. Resource pool for transmission of a pedestrian UE (P-UE) may be overlapped with resources dedicated for V2X sidelink communication. For each transmission pool, the resource selection mechanism (i.e., random selection or partial sensing-based selection) is configured. If the P-UE is configured to choose either random selection or partial sensing-based selection for a transmission pool, then it is up to the UE to select a specific resource selection mechanism. If the eNB does not specify a random selection pool, the P-UEs that only support random selection cannot perform sidelink transmission. In excep- tional resource pool, the P-UE uses random selection. The P-UE can send sidelink UE 838 Chapter 7 information message to indicate that it requests resource pools for pedestrian-related V2X sidelink transmission. It is not mandatory for P-UE to support zone-based resource selec- tion. The P-UE reports whether it supports zone-based resource selection as part of UE capability signaling. The P-UEs do not perform CBR measurements; however, they may adjust the transmission parameters based on the default transmission parameter configura- tion, which can be provided to the P-UE via RRC signaling [6]. The LTE V2X messages can be delivered in unicast mode via non-guaranteed bit rate (non-GBR) or GBR bearers. To meet the QoS message delivery requirements for V2X ser- vices, a non-GBR QoS class identifier (QCI) value and a GBR QCI value are used. For broadcast V2X messages, single-cell point-to-multipoint or multimedia broadcast single frequency network transmission can be used. The reception of downlink broadcast V2X messages on different carriers/PLMNs can be supported by having multiple receiver chains in the UE. A GBR QCI value is used for the delivery of V2X messages over eMBMS bearers [6]. 7.6 LTE/NR V2X Security 3GPP LTE has one of the most advanced security mechanisms among al