Enhanced Random Access Channel (RACH) design for 5G CIOT (Cellular Internet)

摘要

The random access (RA) technology of the Cellular Internet (CIOT) is discussed. An exemplary apparatus is configured for use in a user equipment (UE), the apparatus comprising a receiver circuit, a processor and a transmitter circuit. The receiver circuit is configured to receive RA resource allocation information via one of a system information message or a downlink control information (DCI) message. The processor is operatively coupled to the receiver circuitry to select an RA preamble sequence, generate a payload, and spread the payload through a spreading sequence. The transmitter circuit is configured to transmit an RA message comprising an RA preamble sequence and a payload based on the RA resource allocation information, wherein the RA message is transmitted in an RA slot. The receiver circuitry is further configured to receive a response including a UE device identity and one of an uplink (UL) acknowledgment or an RA reject message.