IP Library › Granted Patent US 12,526,753
Granted Patent B2
US 12,526,753 · App. 16/763,628 · Granted Jan 13, 2026

Methods for supplementary uplink access in wireless systems

Inventors: Ghyslain Pelletier (Montreal, CA); Mouna Hajir (Montreal, CA); Faris Alfarhan (Montreal, CA); J. Patrick Tooher (Montreal, CA); Paul Marinier (Brossard, CA); Martino M. Freda (Laval, CA)
Assignee: InterDigital Patent Holdings, Inc.
H04W52/367H04W72/0453H04W74/00
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Quick Facts
Patent No.
US 12,526,753
App. No.
16/763,628
Granted
Jan 13, 2026
Kind
B2
Abstract

A method performed by a WTRU may comprise transmitting, to a gNB, a first random access preamble on a first physical random access channel (PRACH) resource of a first uplink (UL) carrier and determining that the transmission on the first PRACH resource is unsuccessful. The method may further comprise determining that a maximum number of random access retransmissions on the first UL carrier is met and in response, the WTRU may transmit, to the gNB on a second UL carrier, a third random access preamble on a third PRACH resource. The WTRU may determine an RA-RNTI for a second UL carrier at least in part by a carrier offset. The WTRU may monitor for a random access response (RAR) based on the RA-RNTI.

Claims (19)

1 . A wireless transmit/receive unit (WTRU) comprising a processor and memory, the processor and memory configured to:

attempt to acquire a channel on a first bandwidth part (BWP);

determine that the attempt to acquire the channel on the first BWP was unsuccessful based on a maximum number of unsuccessful access attempts being reached for the first BWP;

switch, based on at least the maximum number of unsuccessful access attempts being reached for the first BWP, from the first BWP associated with the uplink carrier to a second BWP associated with the same uplink carrier, the first BWP being a different BWP than the second BWP for the same uplink carrier;

transmit a random access (RA) preamble via the second BWP associated with the same uplink carrier after the maximum number of unsuccessful access attempts is reached for the first BWP; and

receive a random access response (RAR) in response to the RA preamble transmitted via the second BWP.

2 . The WTRU of claim 1 , wherein the channel is associated with a primary cell.

3 . The WTRU of claim 1 , wherein a RAR is received.

4 . The WTRU of claim 1 , wherein the channel is a channel of an unlicensed spectrum.

5 . The WTRU of claim 1 , wherein the unsuccessful access attempts comprise an unsuccessful attempt of a random access transmission.

6 . A method performed by a wireless transmit/receive unit (WTRU), the method comprising:

attempting to acquire a channel on a first bandwidth part (BWP);

determining that the attempt to acquire the channel on the first BWP was unsuccessful based on a maximum number of unsuccessful access attempts being reached for the first BWP;

switching, based on at least the maximum number of unsuccessful access attempts being reached for the first BWP, from the first BWP associated with the uplink carrier to a second BWP associated with the same uplink carrier, the first BWP being a different BWP than the second BWP for the same uplink carrier;

transmitting a random access (RA) preamble via the second BWP associated with the same uplink carrier after the maximum number of unsuccessful access attempts is reached for the first BWP; and

receiving a random access response (RAR) in response to the RA preamble transmitted via the second BWP.

7 . The method of claim 6 , wherein the channel is associated with a primary cell.

8 . The method of claim 6 , wherein the channel is a channel of an unlicensed spectrum.

9 . The method of claim 6 , wherein the unsuccessful access attempts comprise an unsuccessful attempt of a random access transmission.

Assignments (2)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 27, 2023
From: IDAC HOLDINGS, INC.
To: INTERDIGITAL PATENT HOLDINGS, INC.
Reel/Frame 062527/0562 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 11, 2022
From: PELLETIER, GHYSLAIN; HAJIR, MOUNA; ALFARHAN, FARIS; TOOHER, J. PATRICK; MARINIER, PAUL; FREDA, MARTINO M.
To: IDAC HOLDINGS, INC.
Reel/Frame 059888/0180 →
Continuity (3)
Provisional Application 62591482 · Nov 28, 2017
Provisional Application 62586537 · Nov 15, 2017
Related Publication 20200281022A1 · Sep 3, 2020
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