ation across differ- ent traffic streams corresponding to different sidelink logical channels. PPPP has eight values ranging from one to eight, and each PPPP value represents the priority at which the associated traffic should be treated over the sidelink. Each data packet to be transmitted is assigned a PPPP value selected by the application layer. The UE then performs logical channel prioritization such that the transmission of the data associated with higher PPPP is prioritized. PPPP is also applied to transmission pool selection in the case of UE autonomous resource selection. The network can configure one or multiple PPPP for each transmission pool in the list of pools. Then, for each MAC PDU to transmit on the sidelink, the UE selects a transmission pool associated with the PPPP [2]. For downlink to sidelink mapping, which occurs when the relay UE receives traffic from the eNB, it identifies whether the packet should be relayed, by referring to the destination IP address of the packet. The relay UE then assigns a priority value called PPPP to the received packet to be relayed. The prior- ity assignment is based on the mapping information representing the association between the QoS class identi- fier values of downlink bearers and the priority values. The QoS class identifier-to-priority mapping information is provisioned to the relay UE by the network. 810 Chapter 7 which is characterized by the UE's need for radio resource control (RRC) connection estab- lishment to transmit data and the UE's request for transmission resources from the eNB. The eNB schedules transmission resources for transmission of SCI and data. Sidelink semi- persistent scheduling (SPS) is supported for scheduled resource allocation; and (2) UE autonomous resource selection, which is characterized by the UE's self-selection of resources from resource pools and transport format selection to transmit SCI and data. In the latter case, if mapping between the zones and V2X sidelink transmission resource pools is configured, the UE selects V