US 12,137,478 B2
Efficient messaging in a procedure for accessing a communication channel
Chih-Hsiang Wu, Taoyuan (TW)
Assigned to GOOGLE LLC, Mountain View, CA (US)
Appl. No. 17/290,031
Filed by GOOGLE LLC, Mountain View, CA (US)
PCT Filed Jan. 31, 2020, PCT No. PCT/US2020/016037
§ 371(c)(1), (2) Date Apr. 29, 2021,
PCT Pub. No. WO2020/163160, PCT Pub. Date Aug. 13, 2020.
Claims priority of provisional application 62/801,429, filed on Feb. 5, 2019.
Prior Publication US 2021/0410191 A1, Dec. 30, 2021
Int. Cl. H04W 74/0833 (2024.01)
CPC H04W 74/0833 (2013.01) 14 Claims
OG exemplary drawing
 
1. A method in a base station for granting access to a communication channel, the method comprising:
receiving, at the base station from a user device, a request to access the communication channel, the request including a random access preamble and a payload;
attempting to decode the payload;
in a first instance when the data payload was not successfully decoded:
generating a first response message including a first protocol data unit (PDU) having a first subheader in a first subheader format including extension (E), type (T), and random access preamble identifier (RAPID) fields, the first subheader format indicating a four-step random access channel (RACH) procedure; and
transmitting, to the user device, the first response message;
in a second instance when the data payload was successfully decoded:
generating a second response message including a second PDU having a second subheader in a second subheader format different from the first subheader format and including a reserved (R) field, the second subheader format indicating a two-step RACH procedure; and
transmitting, to the user device, the second response message.