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International application No. Applicant's or agent's file reference
PCT/CN2019/085260 PCT190452PPE
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
30 April 2019
FOR FURTHER ACTION: See Form PCT/ISA/220 as well as, where applicable, item 5 below.
This international search report has been prepared by this International Searching Authority and is transmitted to the applicant according to Article 18. A copy is being transmitted to the International Bureau.
It is also accompanied by a copy of each prior art document cited in this report.
1. Basis of the report
a. With regard to the language, the international search was carried out on the basis of:
the international application in the language in which it was filed.
a translation of the international application into                                          which is the language of a translation furnished for the purposes of international search (Rules 12.3(a) and 23.1(b)).
This international search report has been established taking into account the rectification of an obvious mistake authorized by or notified to this Authority under Rule 91 (Rule 43.6bis(a)).
With regard to any nucleotide and/or amino acid sequence disclosed in the international application, the international search was carried out on the basis of a sequence listing:
2. Certain claims were found unsearchable
3. Unity of invention is lacking
4. Title of the invention
The text is approved as submitted by the applicant.
The text has been established by this Authority to read as follows:
5. Abstract
The text is approved as submitted by the applicant.
The text has been established, according to Rule 38.2, by this Authority as it appears in Box No. IV. The applicant may, within one month from the date of mailing of this international search report, submit comments to this Authority.
6. Drawings
The figure of the drawings to be published with the abstract is Figure No.     4    
as suggested by the applicant.
as selected by this Authority, because the applicant failed to suggest a figure.
as selected by this Authority, because this figure better characterizes the invention.
none of the figures is to be published with the abstract.


     H04W; 74/08(2009.01)i
According to International Patent Classification (IPC) or to both national classification and IPC


Minimum documentation searched (classification system followed by classification symbols):
     H04W; H04L
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
WPI, EPODOC, CNPAT, CNKI, IEEE:frequency resources listen-before-talk procedure occasion


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
US 2016302231 A1 (INSTITUTE FOR INFORMATION INDUSTRY) 13 October 2016 (2016-10-13)
description, paragraphs [0044]-[0045]
WO 2018028838 A1 (TELEFONAKTIEBOLAGET LM ERICSSONPUBL) 15 February 2018 (2018-02-15)
description, page 4 line 6- page 5 line 5
WO 2017028784 A1 (MEDIATEK INC.) 23 February 2017 (2017-02-23)
the whole document
WO 2017140249 A1 (MEDIATEK INC.) 24 August 2017 (2017-08-24)
the whole document
Special categories of cited documents:
document defining the general state of the art which is not considered to be of particular relevance
document cited by the applicant in the international application
earlier application or patent but published on or after the international filing date
document which may throw doubts on priority claim(s) or which is cited to establish the publication date of another citation or other special reason (as specified)
document referring to an oral disclosure, use, exhibition or other means
document published prior to the international filing date but later than the priority date claimed
later document published after the international filing date or priority date and not in conflict with the application but cited to understand the principle or theory underlying the invention
document of particular relevance; the claimed invention cannot be considered novel or cannot be considered to involve an inventive step when the document is taken alone
document of particular relevance; the claimed invention cannot be considered to involve an inventive step when the document is combined with one or more other such documents, such combination being obvious to a person skilled in the art
document member of the same patent family


Patent document cited in search report Publication date
Patent family member(s) Publication date
US 2016302231 A1
13 October 2016
US 10085284 B2
CN 106060933 A
TW 201637477 A
CN 106060933 B
TW I600331 B
25 September 2018
26 October 2016
16 October 2016
27 August 2019
21 September 2017
WO 2018028838 A1
15 February 2018
CN 109845171 A
US 2018235005 A1
04 June 2019
16 August 2018
WO 2017028784 A1
23 February 2017
US 2017055293 A1
BR 112018000730 A2
CN 107251631 A
EP 3298841 A1
EP 3298841 A4
23 February 2017
04 September 2018
13 October 2017
28 March 2018
12 December 2018
WO 2017140249 A1
24 August 2017
TW 201731325 A
TW I642320 B
TW I646856 B
US 2017238342 A1
CN 107852746 A
EP 3395117 A4
BR 112018015621 A2
CN 107615870 A
EP 3395114 A4
EP 3395117 A1
TW 201731328 A
US 10045376 B2
WO 2017140252 A1
BR 112018015660 A2
EP 3395114 A1
01 September 2017
21 November 2018
01 January 2019
17 August 2017
27 March 2018
13 February 2019
26 December 2018
19 January 2018
20 February 2019
31 October 2018
01 September 2017
07 August 2018
24 August 2017
18 December 2018
31 October 2018
Name and mailing address of the ISA/:
National Intellectual Property Administration, PRC
6, Xitucheng Rd., Jimen Bridge, Haidian District, Beijing 100088
Facsimile No. (86-10)62019451
Date of the actual completion of the international search:
19 January 2020
Date of mailing of the international search report:
01 February 2020
Authorized officer:
Telephone No. 86-(10)-53961567
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