RANDOM ACCESS PROCEDURE

WIPO Patent Application WO/2020/207392

A1

Some techniques and apparatuses described herein provide an indication of a result of decoding a two-step random access channel (RACH) message and an action to be performed by a user equipment (UE). For example, some techniques and apparatuses described herein may provide the indication using a UE contention resolution identity-based approach, wherein the contention resolution identity of the UE may be provided in a random access response. Some techniques and apparatuses described herein may use a fallback indicator that indicates the result of decoding and/or the action to be performed. Some techniques and apparatuses described herein may use a random access response (RAR) subheader that selectively omits a random access preamble identifier based at least in part on the result of decoding and/or the action to be performed.

ZHENG RUIMING (US)
HE LINHAI (US)
WEI CHAO (US)
LEI JING (US)
ZHANG XIAOXIA (US)
OZTURK OZCAN (US)
HORN GAVIN BERNARD (US)

PCT/CN2020/083627

October 15, 2020

April 08, 2020

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QUALCOMM INC (US)
ZHENG RUIMING (CN)
HE LINHAI (US)
WEI CHAO (CN)
LEI JING (US)
ZHANG XIAOXIA (US)
OZTURK OZCAN (US)
HORN GAVIN BERNARD (US)

H04W74/08

CN108271275A	2018-07-10
CN108282897A	2018-07-13
US20180205516A1	2018-07-19

CAICT: "A scheme of fallback from 2-step RACH to 4-step RACH", 3GPP DRAFT; R1-1902918, 1 March 2019 (2019-03-01), Athens Greece, pages 1 - 5, XP051600616
ZTE: "Summary of 7.2.1.2 Procedure for Two-step RACH", 3GPP DRAFT; R1-1903436, 1 March 2019 (2019-03-01), Athens, Greece, pages 1 - 12, XP051690820

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