US 12,108,448 B2Granted

SS block methods and procedures for NR-U

AssigneeInterDigital Patent Holdings, Inc.

InventorsKyle Jung-Lin Pan, Nirav B. Shah, Fengjun Xi, Chunxuan Ye

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Abstract

Methods, systems, and apparatuses for use in wireless communication are disclosed. A method of communication on an unlicensed band may include detecting a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block comprising a demodulation references signal (DMRS), a synchronization signal (SS), and a PBCH payload. A SS/PBCH block index may be obtained from one of the DMRS and the PBCH payload. A cyclic rotation indicator may be obtained from the SS/PBCH block (e.g., from the DMRS, the SS, and/or the PBCH payload). A determination may be made that the cyclic rotation indicator indicates an on state and a time gap may be obtained from one of the DMRS and the PBCH payload, based on the determination. Frame timing may be determined based on the cyclic rotation indicator, the SS/PBCH block index, and the time gap.

Claims14

Dependent claims

A wireless transmit/receive unit (WTRU) comprising:

a receiver configured to receive a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block transmission, comprising a plurality of SS/PBCH blocks, wherein each of the plurality of SS/PBCH blocks has a block index;
a transceiver;
and
a processor
wherein the transceiver and processor are configured to:
detect a first SS/PBCH block index;
determine a frame timing based on the first SS/PBCH block index;
determine a second SS/PBCH block index from the detected first SS/PBCH block index;
and
perform an initial access to a cell based on the second SS/PBCH block index;
wherein the second SS/PBCH block index is the first SS/PBCH block index modulo N, wherein N is based on a transmission occasion in which a network acquired access to an unlicensed spectrum;
wherein N is signaled in a PBCH associated with the detected first SS/PBCH block index and indicates the number of SS/PBCH blocks cyclically shifted;
wherein the SS/PBCH blocks are cyclically shifted due to a failure of one or more listen before talk procedures.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/507,181Filed 21 Oct 2021 · continuation
Priority: 8 Aug 2018
Published: US 2022/0116998 A114 Apr 2022
Granted: 1 Oct 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H04W 74/0816
Using carrier sensing, e.g. carrier sense multiple access [CSMA]: with collision avoidance
H04J 11/0069
Orthogonal multiplex systems, e.g. using WALSH codes: cell search, i.e. determining cell identity [cell-ID]
H04J 11/0073
Cell search, i.e. determining cell identity [cell-ID]: acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
H04J 11/0076
Cell search, i.e. determining cell identity [cell-ID]: acquisition of secondary synchronisation channel, e.g. detection of cell-ID group

Family

Application62/715,967Us provisional application · filed 8 Aug 2018
Application62/736,908Us provisional application · filed 26 Sep 2018
Application16/534,550Parent of this continuation · filed 7 Aug 2019
US 2022/0116998 A1Pre-grant publication · published 14 Apr 2022
US 2020/0053781 A1Published application
US 12,108,448 B2This patent

From the US filing history. Foreign family members aren’t listed.