US 12,609,731 B2 · Ultra-lean localization and doppler procedures for 5G and 6G

Abstract

5G and especially 6G are intended to accommodate high-speed mobile user devices and access points such as wireless devices on trains and airplanes, while retaining enhanced mobile broadband eMBB service. Therefore, new resource-efficient, low-complexity procedures are needed for measuring and correcting the Doppler frequency shift. To assist user devices, a base station or access point can periodically broadcast a current geographical location of the base station or access point in a localization message. In some embodiments, the geographical location data can be included in a periodically broadcast system information message, such as unused space of a SSB (synchronization signal block) message or an SIB1 (first system information block) message. User devices can then determine a vector toward the base station or access point relative to the user device location and velocity, and thereby calculate a Doppler correction without a frequency scan or other overhead, according to some embodiments.

Claims15

Dependent claims

A method for a base station of a wireless network to provide location data to a prospective user device, the method comprising:

a. determining or retrieving an antenna location comprising or indicating geographical coordinates of an antenna of the base station;
b. preparing a synchronization signal block (“SSB”) message comprising system information about the base station;
c. adding, to the synchronization signal block message, the geographical coordinates of the antenna location;
and
d. periodically broadcasting, on a broadcast channel of the base station, the synchronization signal block message including the geographical coordinates of the antenna location;
e. wherein the SSB message occupies 240 subcarriers in exactly four orthogonal frequency-division multiplexing (“OFDM”) symbols, wherein a first OFDM symbol of the SSB comprises a primary synchronization signal (“PSS”) and a first group of unallocated subcarriers and a second group of unallocated subcarriers, wherein the first group of unallocated subcarriers includes an indication of a geographical latitude of the antenna location, and the second group of unallocated subcarriers includes an indication of a geographical longitude of the antenna location.

3 more elements

A mobile user device of a wireless network comprising a base station, the mobile user device configured to:

a. receive, from the base station, a synchronization signal block (“SSB”) message comprising system information about the base station, wherein the system information comprises a latitude and a longitude of the base station;
b. calculate, according to the latitude and longitude of the base station, and according to a velocity of the mobile user device, a Doppler frequency shift;
and
c. transmit an uplink message to the base station on a frequency corrected according to the Doppler frequency shift;
d. wherein the SSB message occupies 240 subcarriers in exactly four orthogonal frequency-division multiplexing (“OFDM”) symbols, wherein a first OFDM symbol of the SSB comprises a primary synchronization signal (“PSS”) and a first group of unallocated subcarriers and a second group of unallocated subcarriers, wherein the first group of unallocated subcarriers includes an indication of the latitude of the base station, and the second group of unallocated subcarriers includes an indication of the longitude of the base station.

2 more elements

Dependencies are inferred from the claim text.

Ultra-lean localization and doppler procedures for 5G and 6G

Life of this patent

Ultra-lean localization and doppler procedures for 5G and 6G

Life of this patent

Abstract

Claims15