Patent SG-11201907263W-A (SG)
Title: Downlink retransmission under unreliable code block group (cbg) level ack/nack feedback
Inventor: SUN JING
IPC: H04L1/16
Filed: 2018-02-26
Abstract: CBGA/N 10111 I 2' Tx with 3 CBGs CBG mask 111010011111 1016 101110111 CBG NN 1 \" 1018 3' Tx with 2 CBGs CBG mask 111101110111 1020 ACK 1022 CBG NN decoded wrong CBG A/N decode correctly 1014 CBG mask comparison fail; Error detected CBG mask comparison pass; Continue decoding FIG. 10b O O N 00 O C (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 27 September 2018 (27.09.2018) W I PO I PCT °mono n o oloinosioolionio VII IE (10) International Publication Number WO 2018/175050 Al (51) International Patent Classification: HO4L 1/18 (2006.01) HO4L 1/00 (2006.01) H04L 1/16 (2006.01) (21) International Application Number: PCT/US2018/019724 (22) International Filing Date: 26 February 2018 (26.02.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 62/475,752 23 March 2017 (23.03.2017) US 15/711,652 21 September 2017 (21.09.2017) US (71) Applicant: QUALCOMM INCORPORATED [US/US]; ATTN: International IP Administration, 5775 Morehouse Drive, San Diego, California 92121-1714 (US). (72) Inventors: SUN, Jing; 5775 Morehouse Drive, San Diego, California 92121-1714 (US). JIANG, Jing; 5775 More- house Drive, San Diego, California 92121-1714 (US). (74) Agent: SUBRAMANIAN, Karthik K. et al.; Patterson & Sheridan, L.L.P., 24 Greenway Plaza, Suite 1600, Houston, Texas 77046-2472 (US). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (54) Title: DOWNLINK RETRANSMISSION UNDER UNRELIABLE CODE BLOCK GROUP (CBG) LEVEL ACK/NACK FEED- BACK 10b gNB 1050 UE 1052 TX with 12 CBGs • 1012 4 CBGs fail CRC (57) : Methods and Apparatus are provided for downlink retransmission of Code Block Groups (CBGs) when CBG level ACK and NACK feedback is unreliable. A User Equipment (UE) transmits to a Base Station (BS) feedback indicating an Acknowledgement (ACK) or a Negative Acknowledgement (NACK) corresponding to each of received set of CBGs transmitted by the BS to the UE. The BS receives and decodes the feedback and transmits back to the UE information regarding a result of the decoding. The UE, based on the received information, determines whether the BS correctly received and decoded the ACK/NACK feedback, and in some cases, ACKs and NACKs corresponding to which CBGs were incorrectly decoded by the BS. The UE processes retransmitted CBGs received from the BS based on this determination. [Continued on next page] WO 2018/175050 Al MIDEDIMOMMIDIREIDIOMOIMINIMEIHMEMOIMIE (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). Declarations under Rule 4.17: as to applicant's entitlement to apply for and be granted a patent (Rule 4.17(ii)) as to the applicant's entitlement to claim the priority of the earlier application (Rule 4.17(iii)) Published: — with international search report (Art. 21(3))