US 12,245,295 B2
Method and apparatus for a two-step random access procedure
Hyejung Jung, Northbrook, IL (US); Joachim Löhr, Wiesbaden (DE); Vijay Nangia, Woodridge, IL (US); Prateek Basu Mallick, Dreieich (DE); Ravi Kuchibhotla, Chicago, IL (US); Alexander Johann Maria Golitschek Edler von Elbwart, Darmstadt (DE); and Robert T. Love, Barrington, IL (US)
Assigned to Lenovo (Singapore) Pte. Ltd., New Tech Park (SG)
Appl. No. 17/764,182
Filed by Lenovo (Singapore) Pte. Ltd., New Tech Park (SG)
PCT Filed Oct. 5, 2020, PCT No. PCT/IB2020/059310
§ 371(c)(1), (2) Date Mar. 26, 2022,
PCT Pub. No. WO2021/064707, PCT Pub. Date Apr. 8, 2021.
Claims priority of provisional application 62/911,197, filed on Oct. 4, 2019.
Prior Publication US 2022/0377812 A1, Nov. 24, 2022
Int. Cl. H04W 74/08 (2024.01); H04L 1/00 (2006.01); H04L 1/1812 (2023.01); H04W 24/08 (2009.01); H04W 52/24 (2009.01); H04W 52/32 (2009.01); H04W 52/36 (2009.01); H04W 74/00 (2009.01); H04W 74/0833 (2024.01)
CPC H04W 74/0841 (2013.01) [H04L 1/0061 (2013.01); H04L 1/1812 (2013.01); H04W 24/08 (2013.01); H04W 52/242 (2013.01); H04W 52/325 (2013.01); H04W 52/367 (2013.01); H04W 74/002 (2013.01); H04W 74/006 (2013.01); H04W 74/0833 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method in a user equipment, the method comprising:
determining first transmission power for a first physical random access channel preamble in a 2-step random access procedure based on a first set of power control parameters;
transmitting the first physical random access channel preamble in the 2-step random access procedure based on the first transmission power;
determining to switch from the 2-step random access procedure to a 4-step random access procedure;
determining, in response to determining to switch, second transmission power based on the first set of power control parameters and a second set of power control parameters for a subsequent second physical random access channel preamble transmission for the 4-step random access procedure; and
transmitting the subsequent second physical random access channel preamble transmission in the 4-step random access procedure based on the second transmission power,
wherein the method further comprises:
incrementing a preamble power ramping counter by 1 before determining the second transmission power; and
setting a second physical random access channel target reception power to a value equal to a second initial preamble received target power+a second preamble format-specific power offset+(the preamble power ramping counter−2)×a first power ramping factor+a second power ramping factor.