Patent SG-11201806443R-A (SG)
Title: Narrowband wireless communications cell search
Inventor: LEI JING
IPC: H04W56/00
Filed: 2017-01-06
Abstract: INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property -, Organization IIIMI41101110101011111 HO 11111011101111011110110011111011 EDO IIE III International Bureau ... .... ..Yjd ..... ...,, (10) International Publication Number (43) International Publication Date WO 2017/155601 Al 14 September 2017 (14.09.2017) WIP0 I PCT _ (51) (21) (22) (25) Filing Language: (26) Publication Language: (30) (71) (72) International Patent Classification: 92121-1714 (US). WANG, Xiao, Feng; 5775 Morehouse H04W 56/00 (2009.01) Drive, San Diego, California 92121-1714 (US). WANG, International Application Number: Renqiu; 5775 Morehouse Drive, San Diego, California PCT/US2017/012562 92121-1714 (US). WEI, Yongbin; 5775 Morehouse Drive, San Diego, California 92121-1714 (US). MONTOJO, International Filing Date: Juan; 5775 Morehouse Drive, San Diego, California 6 January 2017 (06.01.2017) 92121-1714 (US). RICO ALVARINO, Alberto; 5775 English Morehouse Drive, San Diego, California 92121-1714 (US). GAAL, Peter; 5775 Morehouse Drive, San Diego, Califor- English nia 92121-1714 (US). Priority Data: (74) Agent: LARSEN, Per, H.; Holland & Hart LLP, P.O. Box 62/307,419 11 March 2016 (11.03.2016) US 11583, Salt Lake City, Utah 84147 (US). 15/376,025 12 December 2016 (12.12.2016) US (81) Designated States (unless otherwise indicated, for every Applicant: QUALCOMM INCORPORATED [US/US]; kind of national protection available): AE, AG, AL, AM, ATTN: International IP Administration, 5775 Morehouse AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, Drive, San Diego, California 92121-1714 (US). 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, Inventors: LEI, Jing; 5775 Morehouse Drive, San Diego, HN, HR, HU, ID, IL, IN, IR, IS, JP, KE, KG, KH, KN, California 92121-1714 (US). XU, Hao; 5775 Morehouse KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, Drive, San Diego, California 92121-1714 (US). CHEN, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, Wanshi; 5775 Morehouse Drive, San Diego, California NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, [Continued on next page] (54) Title: NARROWBAND WIRELESS COMMUNICATIONS CELL SEARCH Pc lot Found (57) : Methods, systems, and devices for wireless communication are described. A base station may broadcast a synchronization signal using a narrowband portion of a bandwidth of a cell. The synchronization signal may I include a sequence repeated over several symbol periods using a cover code — = = Peak Found to A support power-efficient cell acquisition. user equipment (UE) receiving Sliding Auto-Correlation Estimation for Coarse the synchronization signal may determine frequency and timing information at 240 kHz Timing and Fractional It tendency Offsets for a cell by performing a weighted combination and accumulation of low - _ = ( 1 complexity autocorrelation and cross-correlation procedures on the synchron- 510 1 ization signal. The reduced complexity correlation procedures may be en- \ Peak \"Rejected\" \ abled based on the use of the cover code and a base sequence. In some cases, . ,- the cross-correlation may be performed at multiple sampling rates. The use of = = = the cover code within the synchronization signal may also support correlation Cross-Correlation at 240 kHz procedures that use recursive or repeated updates, which may allow for fur- ther reduced computational complexity relative to other cell search proced- = = _ 515 PSS Presence ores. = Cross-Correlation atl 921\41iz - _ Refined Frequency and 520 Timing Offsets = 11 11 © :D In 11 --.... IN 11 © N Cell ID Decoding & 'I racking in 525 500 FIG. 5 O WO 2017/155601 Al MIDEDIMOMOIDEIR010131101MIIMMOVOIMIE (84) 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. Designated States (unless otherwise indicated, for every 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). kind of regional protection available): ARIPO (BW, GH, Published: GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, — TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, with international search report (Art. 21(3)) TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE,