Patent ID: 8908619

Claim:
A method of Medium Access Control (MAC) Protocol Data Unit (PDU) signaling, the method performed by a network and comprising: receiving, from a Machine-Type Communication (MTC) device, a random access preamble; sending, to the MTC device, a random access response that includes a MAC PDU having a MAC header including information for supporting the MTC device; receiving, from the MTC device, a scheduled transmission; and performing contention resolution with the MTC device, wherein the information for supporting the MTC device includes an amount of random access channel (RACH) load and RACH load control modes for the MTC device which are defined as access class barring (ACB) only mode, backoff control (BOC) only mode and both ACB and BOC mode, and wherein each mode of the RACH load control modes is switchably used by the MTC device based on the amount of RACH load for determining re-attempt timing to transmit a random access preamble due to failure of reception of the random access response.