Novel method for synthesis of synchronization signal abstraction for 5G RF repeater

It is important to acquire accurate synchronization in the time division duplex (TDD) system that uses downlink and uplink separately in time because interference exists when downlink and uplink time slots overlap. It is also important to know the precise timing of downlink and uplink for the 5G RF repeater that receives the signal of the base station with the link antenna, amplifies it, and serves through a service antenna because the 5G RF repeater also switches the roles of link antenna and service antenna when switching downlink and uplink. The synchronization signal block (SSB) decoding method is used to know the downlink and uplink timings of the base station. However, this method has the disadvantage that it cannot be used when the SS signal to interference and noise ratio (SS-SINR) is below the decodable SINR such as the boundary of multiple cells. This paper proposes a new method of synchronization signal abstraction that can acquire synchronization even in the section where SS-SINR is below the decodable SINR due to SS-SINR interference by introducing a way to acquire synchronization without decoding by receiving SSB and identifying its pattern. The new method of synchronization signal abstraction can increase the installation coverage of the 5G RF repeater by 293% compared to the SSB decoding method.