cated resources by the eNB. It further supports HARQ combining, but there is no sup- port for HARQ feedback. The sidelink transport channels further include SL-SCH, which has similar characteristics as the SL-DCH, as well as support for dynamic link adaptation by varying the transmit power, modulation, and coding [6]. In the sidelink, no HARQ feed- back is used and the retransmissions are always performed in a predefined/configured num- ber. Furthermore, the measurement gaps and sidelink discovery transmission during a sidelink discovery gap for transmission are of higher priority than HARQ retransmissions; that is, whenever a HARQ retransmission collides with a measurement gap or sidelink dis- covery transmission during a sidelink discovery gap for transmission, the HARQ retransmis- sion does not happen. One of the functions of the RRC sublayer is broadcasting the system information. Both LTE RRC states, RRC_IDLE and RRC_CONNECTED, support sidelink transmission and reception; sidelink discovery announcement and monitoring; and V2X sidelink transmis- sion and reception. The SystemInformationBlockType18 contains information related to sidelink communication; SystemInformationBlockType19 contains information related to sidelink discovery; and SystemInformationBlockType21 contains information related to V2X sidelink communication. The LTE RAN uses SL-RNTI and SL-V-RNTI to identify sidelink communication scheduling and V2X sidelink communication scheduling, respec- tively [6]. 834 Chapter 7 In order to assist an LTE base station in providing sidelink resources, a UE in RRC_CONNECTED state may report geographical location information to the serving eNB. The eNB can configure the UE to report the complete UE geographical location infor- mation based on periodic reporting via the existing measurement report signaling. Geographical zones can be configured by the eNB or preconfigured. When zones are (pre-) configured, the area is divided into geographical subdivisions using a single fixed reference point; that is, geograp