18244439. RANDOM ACCESS CHANNEL (RACH) RESPONSE (RAR) RECEPTION IN AN UNLICENSED RADIO FREQUENCY (RF) SPECTRUM BAND simplified abstract (QUALCOMM Incorporated)
RANDOM ACCESS CHANNEL (RACH) RESPONSE (RAR) RECEPTION IN AN UNLICENSED RADIO FREQUENCY (RF) SPECTRUM BAND
Organization Name
Inventor(s)
Ozcan Ozturk of San Diego CA (US)
Xiaoxia Zhang of San Diego CA (US)
RANDOM ACCESS CHANNEL (RACH) RESPONSE (RAR) RECEPTION IN AN UNLICENSED RADIO FREQUENCY (RF) SPECTRUM BAND - A simplified explanation of the abstract
This abstract first appeared for US patent application 18244439 titled 'RANDOM ACCESS CHANNEL (RACH) RESPONSE (RAR) RECEPTION IN AN UNLICENSED RADIO FREQUENCY (RF) SPECTRUM BAND
Simplified Explanation
This disclosure describes a system for improving reception of a random access response (RAR) by a user equipment (UE) in an unlicensed spectrum.
- Calculation procedure for a random access radio network temporary identifier (RA-RNTI) specific to unlicensed spectrum based on an extended RAR window.
- UEs transmitting in the window can calculate a unique RA-RNTI to identify a RAR addressed to them.
- Base station can transmit a RAR with timing information associated with a corresponding random access request.
- UE can compare the timing information with its own request to determine if the RAR is for them.
- UE can monitor a secondary cell or sub-band for the RAR.
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- Potential Applications
- Improved reception of RAR in unlicensed spectrum.
- Enhanced communication between UEs and base stations in crowded environments.
- Problems Solved
- Difficulty in receiving RAR in unlicensed spectrum.
- Confusion in identifying RAR addressed to specific UEs.
- Benefits
- Increased efficiency in communication.
- Reduced interference and improved reliability in unlicensed spectrum communication.
Original Abstract Submitted
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.
