Efficient rach behavior

Abstract

Apparatuses, methods, and systems are disclosed for efficient RACH behavior. One apparatus includes a transmitter that transmits a first PRACH preamble to a base unit to start a RACH procedure; a receiver that receives a RAR (Msg2) from the base unit during a random access response window; and a processor that controls the transmitter to transmit a second PRACH preamble in response to being unable to transmit a RACH Msg3 within an indicated transmission opportunity. The processor may obtain multiple transmission opportunities for transmitting a RACH message such as RACH Msg1 or RACH Msg3 or monitor for multiple RACH Msg2 where transmission opportunity data are conveyed via a RACH Order, an RAR, or DCI for the RACH message. A method or system may perform functions of the apparatus.

Dependencies are inferred from the claim text.