Patent SG-11201908761X-A (SG)
Title: Transmission scheme for wireless communication systems
Inventor: CHUANG CHIAO-YAO
IPC: H04W72/00
Filed: 2018-03-23
Abstract: 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) WIP0 I PCT Iiiimmoimmonotiolomolowolomitilowomom (10) International Publication Number WO 2018/171720 Al (51) International Patent Classification: H04W 52/00 (2009.01) H04W 72/00 (2009.01) (21) International Application Number: PCT/CN2018/080211 (22) International Filing Date: 23 March 2018 (23.03.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 62/475,949 24 March 2017 (24.03.2017) US 15/927,216 21 March 2018 (21.03.2018) US (71) Applicant: MEDIATEK INC. [CN/CN]; No. 1, Dusing Rd. 1st, Science-Based Industrial Park, Hsin-Chu, Taiwan 300 (CN). (72) Inventors: CHUANG, Chiao-Yao; No. 1, Dusing Rd. 1st, Science-Based Industrial Park, Hsin-Chu, Taiwan 300 (CN). LIN, Song-Jheng; No. 1, Dusing Rd. 1st, Science- Based Industrial Park, Hsin-Chu, Taiwan 300 (CN). CHEN, Yih-Shen; No. 1, Dusing Rd. 1st, Science-Based Industrial Park, Hsin-Chu, Taiwan 300 (CN). (74) Agent: BEIJING SANYOU INTELLECTUAL PROP- ERTY AGENCY LTD.; 16th F1.,Block A,Corporate Square,No.35 Jinrong Street, Beijing 100033 (CN). (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. (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). — (54) Title: TRANSMISSION SCHEME FOR WIRELESS COMMUNICATION SYSTEMS 1-1 N 1-1 N 1-1 00 1-1 O C jrn FIG. 3 (57) : A method of two-layer (Rank=2) demodulation reference signal (DMRS) based transmission scheme is proposed. The precoding matrix on a data RE can be represented as AxB. The precoding matrix on the UE-specific reference signal DMRS is A. Matrix B is the co-phasing cycling matrix. By applying the proposed co-phasing cycling matrix B for Rank=2 DMRS-based transmission scheme, the ratio of PDSCH EPRE to DMRS EPRE is equal to OdB, as required by the LTE specification. Further, when the DMRS power follows the precoding matrix A, UE channel estimation performance is improved. [Continued on next page] WO 2018/171720 Al MIDEDIMOMMIDIREEMOMOMOIMMOVOIMIE Published: — with international search report (Art. 21(3))