Patent ID: 11870632
Assignee: SUNWAVE COMMUNICATIONS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
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.