Random access channel (RACH) response (RAR) reception in an unlicensed radio frequency (RF) spectrum band

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United States of America Patent

PATENT NO 11910444
SERIAL NO

17410757

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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This disclosure provides systems, methods, and apparatuses to enable a user equipment (UE) and a base station to improve reception of a random access response (RAR) by the UE in an unlicensed spectrum. A network may define a procedure for calculating a random access radio network temporary identifier (RA-RNTI) specific to unlicensed spectrum based on an extended RAR window. The calculation procedure may allow UEs transmitting in the window to calculate a unique RA-RNTI and identify a RAR addressed to the UE using the unique RA-RNTI. Additionally, or alternatively, a base station may transmit a RAR including timing information associated with a corresponding random access request. Accordingly, a UE may receive the RAR and compare the timing information with its own random access request in order to determine whether the RAR is addressed to the UE. Additionally, a UE may monitor a secondary cell or a sub-band for the RAR.

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Patent Owner(s)

Patent OwnerAddress
QUALCOMM INCORPORATED5775 MOREHOUSE DRIVE SAN DIEGO CA 92121-1714

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Luo, Tao San Diego, US 5048 29352
Ozturk, Ozcan San Diego, US 576 1836
Sun, Jing San Diego, US 2183 9580
Zhang, Xiaoxia San Diego, US 2437 11203

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