Initial and retransmissions of data for V2X transmissions

A user equipment, comprising:

• a receiver and a processor, which in operation, perform a resource sensing procedure about radio resources usable for the user equipment to transmit data via a sidelink interface at a later point in time, wherein
• the processor, in operation, performs an autonomous radio resource allocation to select time-frequency radio resources within a transmission window to be used for performing a first transmission of the data, based on a result of the resource sensing procedure during a sensing window, and
• the processor, in operation, determines a data transmission timing pattern among a plurality of data transmission timing patterns, each data transmission timing pattern indicating a transmission timing for performing one or more transmissions of data;
• and
• a transmitter, which is coupled to the processor and which, in operation,
• performs the first data transmission using the selected time-frequency radio resources, and
• performs one or more data retransmissions at a retransmission timing based on a combination of the transmission timing indicated by the determined data transmission timing pattern and a time gap between the first data transmission and the one or more data retransmissions,
• wherein the time gap is configurable, separately from the determined data transmission timing pattern, and is made known to receiving devices, and
• wherein the one or more data retransmissions are performed within a time span defined by a length of the determined data transmission timing pattern.