US Patent No. 10,142,962

METHOD AND APPARATUS FOR ENHANCING COVERAGE OF MACHINE TYPE COMMUNICATION (MTC) DEVICES


Patent No. 10,142,962
Issue Date November 27, 2018
Title Method And Apparatus For Enhancing Coverage Of Machine Type Communication (mtc) Devices
Inventorship Moon-il Lee, Farmingdale, NY (US)
Janet A. Stern-Berkowitz, Little Neck, NY (US)
Nobuyuki Tamaki, Melville, NY (US)
John W. Haim, Baldwin, NY (US)
Pouriya Sadeghi, Verdun (CA)
Marian Rudolf, Montreal (CA)
Shahrokh Nayeb Nazar, Montreal (CA)
Assignee InterDigital Patent Holdings, Inc., Wilmington, DE (US)

Claim of US Patent No. 10,142,962

1. A wireless transmit/receive unit (WTRU) configured to operate using a coverage enhancement mode at a coverage enhancement level, the WTRU comprising:a receiver configured to receive configuration information related to a random access channel from an eNode-B, the configuration information including at least a first coverage enhancement level having a first response window time configuration information and a first repetition factor, and a second coverage enhancement level having a second response window time configuration information and a second repetition factor;
a transmitter configured to transmit using the configuration information, a first random access preamble transmission according to the first coverage enhancement level having a first response window time according to the first response window time configuration information and not the second response window time configuration information, and the first repetition factor;
the transmitter further configured to transmit using the configuration information, on a condition that a random access response (RAR) message is not received within the first response window time in response to the first random access preamble transmission, a second random access preamble transmission according to the second coverage enhancement level having a second response window time according to the second response window time configuration information and not the first response window time configuration information, and the second repetition factor; and
wherein the first and second repetition factors indicate a number of times to repeat each preamble during each transmission, and
wherein the first repetition factor of the first coverage enhancement level is lower than the second repetition factor of the second coverage enhancement level.