Patent ID: 11864130
Assignee: NEXTNAV FRANCE
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A wireless communications method comprising:
synchronously transmitting, periodically from a base station among synchronized base stations of a single frequency network implementing a single cell network, a common downlink synchronization signal and a system frame number least significant bits signal;
where the system frame number least significant bits signal contains a portion of a system frame number;
where the system frame number least significant bits signal is transmitted using a code division multiple access (CDMA) mode and underlays LTE OFDM symbols reserved for at least one of secondary synchronization signal (SSS), primary synchronization signal (PSS), and physical broadcast channel (PBCH) broadcasted signals transmitted by the base station in licensed bands of a cellular system;
where the common downlink synchronization signal is transmitted in the CDMA mode and underlays the LTE OFDM symbols reserved for the at least one of the secondary synchronization signal (SSS), primary synchronization signal (PSS), and physical broadcast channel (PBCH) broadcasted signals transmitted in the licensed bands of the cellular system;
where the system frame number indicates timing when a system information block signal will be transmitted;
where the system information block signal contains information related to downlink and uplink transmission schedules and allocations;
where the common downlink synchronization signal and the system frame number least significant bits signal are a synchronization signal; and
where the synchronization signal is designed to not interfere with reception of the broadcasted signals by standard wireless devices by more than 2 dB when an observed signal-to-noise ratio (SNR) without interference is −6 dB.