US 11,870,632 B2
Method, device and apparatus for time division duplex synchronization for distributed antenna system, and medium
Qingsong Chen, Hangzhou (CN); Xin Wang, Hangzhou (CN); Ailin Ren, Hangzhou (CN); Jianyang Mao, Hangzhou (CN); Rulong Chu, Hangzhou (CN); and Wenquan Wu, Hangzhou (CN)
Assigned to SUNWAVE COMMUNICATIONS CO., LTD., Hangzhou (CN)
Appl. No. 17/614,561
Filed by SUNWAVE COMMUNICATIONS CO., LTD., Hangzhou (CN)
PCT Filed Aug. 3, 2020, PCT No. PCT/CN2020/106601
§ 371(c)(1), (2) Date Nov. 29, 2021,
PCT Pub. No. WO2021/023157, PCT Pub. Date Feb. 11, 2021.
Claims priority of application No. 201910722762.5 (CN), filed on Aug. 6, 2019.
Prior Publication US 2022/0231896 A1, Jul. 21, 2022
Int. Cl. H04L 27/00 (2006.01); H04L 27/26 (2006.01); H04L 5/14 (2006.01); H04L 25/02 (2006.01); H04W 56/00 (2009.01)
CPC H04L 27/2656 (2013.01) [H04L 5/1469 (2013.01); H04L 25/0224 (2013.01); H04W 56/001 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for time division duplex synchronization for a distributed antenna system, comprising:
decoding a Synchronization Signal/Physical Broadcast Channel (SS/PBCH) block from a time division duplex cell, and obtaining an index of the SS/PBCH block;
determining, according to the index of the SS/PBCH block, a starting position of a radio frame in which the SS/PBCH block is located; and performing time division duplex synchronization according to the starting position of the radio frame and a preset uplink and downlink configuration of the radio frame; wherein the determining, according to the index of the SS/PBCH block, the starting position of the radio frame in which the SS/PBCH block is located comprises: determining a mode of the SS/PBCH block according to a subcarrier interval of the SS/PBCH block and a frequency band of the SS/PBCH block, and thereby determining the starting position of the radio frame in which the SS/PBCH block is located; wherein the decoding the SS/PBCH block from the time division duplex cell comprises: decoding the SS/PBCH block through a cell search and a downlink synchronization process; the decoding the SS/PBCH block through the cell search and the downlink synchronization process comprises: selecting a target cell by searching a Primary Synchronization signal (PSS); receiving, upon searching for a PSS signal carrying an intra-group identification NID(2) of the target cell, the SS/PBCH block from the target cell; decoding a Secondary Synchronization signal (SSS) in the SS/PBCH block, and obtaining a group identification NID(1) of the target cell, wherein N represents a variable; calculating a cell identification NIDCell of the target cell according to the intra-group identification NID(2) and the group identification NID(1); decoding a PBCH DM-RS signal in the SS/PBCH block according to the cell identification NIDCell; and determining the index of the SS/PBCH block according to the decoded PBCH DM-RS signal; the determining, according to the index of the SS/PBCH block and the mode of the SS/PBCH block, the starting position of the radio frame in which the SS/PBCH block is located further comprises: determining, according to the index of the SS/PBCH block and the mode of the SS/PBCH block, a position of a first OFDM symbol of the SS/PBCH block in the radio frame, and thereby locating the starting position of the radio frame.