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Title:
CROSS CARRIER RANDOM ACCESS CONFIGURATION
Document Type and Number:
WIPO Patent Application WO/2021/057841
Kind Code:
A1
Abstract:
Methods, systems, and devices for wireless communications are described. Random access channel (RACH) occasions may be scheduled on each component carrier (CC) of a carrier aggregation (CA) configuration that includes both a time division duplexing (TDD) band and at least one frequency division duplexing (FDD) band based on a synchronization signal/physical broadcast channel block (SSB) received in the TDD band. In some cases, the TDD band may be used to configure the RACH occasions in same and/or different CCs. Additionally or alternatively, the FDD band may configure the RACH occasions on its uplink CC based on SSBs received on other CCs. Additionally, the RACH occasions may be configured such that the UE avoids unavailable uplink slots when transmitting a first RACH message in a RACH occasion.

Inventors:
CAO YIQING (US)
HAN BIN (US)
LEI JING (US)
Application Number:
PCT/CN2020/117389
Publication Date:
April 01, 2021
Filing Date:
September 24, 2020
Export Citation:
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Assignee:
QUALCOMM INC (US)
CAO YIQING (CN)
HAN BIN (CN)
LEI JING (US)
International Classes:
H04W74/08
Domestic Patent References:
WO2012173565A12012-12-20
WO2019104299A12019-05-31
Foreign References:
CN102917468A2013-02-06
Other References:
CHTTL: "Initial Random Access Management for Carrier Aggregation System", 3GPP DRAFT; R1-094976_INITIAL ACCESS MANAGEMENT FOR CARRIER AGGREGATION SYSTEM_V2_CHTTL, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Jeju, Korea; 20091109 - 20091113, 3 November 2009 (2009-11-03), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP050597869
SAMSUNG: "NR 4-step random access procedure", 3GPP DRAFT; R1-1700891, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG1, no. Spokane, Wa; 20170116 - 20170120, 16 January 2017 (2017-01-16), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051208407
Attorney, Agent or Firm:
NTD PATENT & TRADEMARK AGENCY LTD. (CN)
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