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International application No. Applicant's or agent's file reference
PCT/US2019/057868 AB6645-PCT
International filing date (day/month/year) (Earliest) Priority Date (day/month/year)
24 October 2019 31 October 2018
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.

Systems, methods, and devices are provided to: perform packet data convergence protocol (PDCP) deciphering of the packets to store deciphered packets in a common buffer; perform PDCP reordering of the deciphered packets in the common buffer to generated a stream or reordered packets; perform robust header compression (ROHC) decompression on the stream of reordered packets; and determine, based on a packet indication, to reset the ROHC decompression, wherein the packet indication comprises a single bit in a PDCP header set to indicate a start of ROHC reset based on a path switch during a handover from a source cell to a target cell.

6. Drawings
The figure of the drawings to be published with the abstract is Figure No.     1    
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 28/06 (2009.01)i; H04W 36/02 (2009.01)i; H04W 36/08 (2009.01)i; H04W 12/10 (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):
Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched:
Korean utility models and applications for utility models
Japanese utility models and applications for utility models
Electronic data base consulted during the international search (name of data base and, where practicable, search terms used):
eKOMPASS(KIPO internal) & keywords: handover, PDCP(packet data convergence protocol), decipher, reorder, ROHC(robust header compression), reset


Category* Citation of document, with indication, where appropriate, of the relevant passages Relevant to claim No.
US 2010-0195617 A1 (SUNG JUN PARK et al.) 05 August 2010 See paragraphs [0049]-[0058], [0075]-[0076], [0088], [0107], [0117]-[0122]; and figures 4, 6.
US 2018-0083688 A1 (SAMSUNG ELECTRONICS CO., LTD.) 22 March 2018 See paragraphs [0073]-[0075], [0082], [0111], [0404]; and figure 1A.
WO 2016-021820 A1 (LG ELECTRONICS INC.) 11 February 2016 See paragraphs [0090], [0125]; and figures 10, 12.
US 2017-0318496 A1 (LG ELECTRONICS INC.) 02 November 2017 See paragraphs [0054]-[0064].
US 2015-0280905 A1 (TELEFONAKTIEBOLAGET L M ERICSSON) 01 October 2015 See paragraphs [0036], [0041]-[0044].
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 2010-0195617 A1
05 August 2010
EP 2168270 A2
EP 2168270 A4
EP 2168270 B1
KR 10-1387537 B1
KR 10-2009-0031239 A
US 2010-0202380 A1
US 8400982 B2
US 8493911 B2
WO 2009-038312 A2
WO 2009-038312 A3
31 March 2010
29 September 2010
17 February 2016
21 April 2014
25 March 2009
12 August 2010
19 March 2013
23 July 2013
26 March 2009
07 May 2009
US 2018-0083688 A1
22 March 2018
CN 109691155 A
EP 3494756 A1
KR 10-2019-0029741 A
US 10432291 B2
WO 2018-030798 A1
26 April 2019
12 June 2019
20 March 2019
01 October 2019
15 February 2018
WO 2016-021820 A1
11 February 2016
US 2016-0044639 A1
11 February 2016
US 2017-0318496 A1
02 November 2017
AU 2008-227323 A1
AU 2008-227323 B2
BR PI0808882 A2
CN 101636939 A
CN 101636939 B
EP 2122862 A1
EP 2122862 B1
JP 2014-241598 A
JP 5826336 B2
KR 10-1356932 B1
KR 10-2008-0086318 A
MX 2009009848 A
RU 2009134651 A
TW 200847678 A
TW I427951 B
US 10244430 B2
US 10433206 B2
US 2019-0174352 A1
WO 2008-114993 A1
WO 2008-115025 A1
25 September 2008
28 October 2010
26 August 2014
27 January 2010
21 August 2013
25 November 2009
25 October 2017
25 December 2014
02 December 2015
29 January 2014
25 September 2008
24 September 2009
27 April 2011
01 December 2008
21 February 2014
26 March 2019
01 October 2019
06 June 2019
25 September 2008
25 September 2008
US 2015-0280905 A1
01 October 2015
Name and mailing address of the ISA/:
Korean Intellectual Property Office
189 Cheongsa-ro, Seo-gu, Daejeon Metropolitan City, 302-701
Republic of Korea
Facsimile No. +82-42-481-8578
Date of the actual completion of the international search:
14 February 2020
Date of mailing of the international search report:
14 February 2020
Authorized officer:
YANG, Jeong Rok
Telephone No. +82-42-481-5709
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