Synchronisation and broadcasting between base station and user equipment
A base station for a mobile telecommunications system has circuitry configured to communicate with at least one user equipment, wherein the circuitry is further configured to set a first subcarrier spacing for transmission of at least one synchronization signal; and set a second subcarrier spacing for transmission on a physical broadcast channel, wherein the first subcarrier spacing differs from the second subcarrier spacing.
1. A base station for a mobile telecommunications system, the base station comprising:
circuitry configured to:
communicate with at least one user equipment; and
transmit symbols on a physical broadcast channel (PBCH) with a subcarrier spacing, wherein
modulation symbols are repeated in consecutive resource elements in a frequency domain,
each burst of the PBCH with the subcarrier spacing includes a reference symbol repeated in the consecutive resource elements,
the subcarrier spacing of the PBCH differs from a subcarrier spacing of a primary synchronization signal,
the primary synchronization signal includes a synchronization sequence,
a sign of one part of the synchronization sequence corresponds to the subcarrier spacing of the primary synchronization signal, and
a sign of another part of the synchronization sequence corresponds to the subcarrier spacing of the PBCH.
2. The base station of claim 1 , wherein the symbols include quadrature amplitude modulation symbols.
3. The base station of claim 1 , wherein the reference symbol is for demodulation of the PBCH.
4. A user equipment for a mobile telecommunications system, the user equipment comprising:
circuitry configured to:
communicate with at least one base station; and
receive symbols on a physical broadcast channel (PBCH) with a subcarrier spacing, wherein
modulation symbols are repeated in consecutive resource elements in a frequency domain,
each burst of the PBCH with the subcarrier spacing includes a reference symbol repeated in the consecutive resource elements,
the subcarrier spacing of the PBCH differs from a subcarrier spacing of a primary synchronization signal,
the primary synchronization signal includes a synchronization sequence,
a sign of one part of the synchronization sequence corresponds to the subcarrier spacing of the primary synchronization signal, and
a sign of another part of the synchronization sequence corresponds to the subcarrier spacing of the PBCH.
5. The user equipment of claim 4 , wherein the symbols include quadrature amplitude modulation symbols.
6. The user equipment of claim 4 , wherein the circuitry is further configured to decode repeatedly transmitted symbols based on the subcarrier spacing of the primary synchronization signal.
7. The user equipment of claim 4 , wherein the circuitry is further configured to decode repeatedly transmitted symbols based on a second subcarrier spacing of the PBCH.
8. The user equipment of claim 4 , wherein the circuitry is further configured to demodulate the PBCH according to the reference symbol.
9. A base station for a mobile telecommunications system, the base station comprising:
circuitry configured to:
communicate with at least one user equipment; and
transmit symbols, on a physical broadcast channel (PBCH), by applying a phase ramp, wherein
each burst of the PBCH includes a reference symbol that is repeated in consecutive resource elements,
a subcarrier spacing of the PBCH differs from a subcarrier spacing of a primary synchronization signal,
the primary synchronization signal includes a synchronization sequence,
a sign of one part of the synchronization sequence corresponds to the subcarrier spacing of the primary synchronization signal, and
a sign of another part of the synchronization sequence corresponds to the subcarrier spacing of the PBCH.
10. The base station of claim 9 , wherein the reference symbol is based on a Zadoff-Chu sequence.
11. The base station of claim 10 , wherein a root of the Zadoff-Chu sequence differs from a root of a Zadoff-Chu sequence used for the primary synchronization signal.
12. The base station of claim 9 , wherein the phase ramp is based on a phase shift applied to a previous symbol.
13. The base station of claim 9 , wherein a phase shift of the phase ramp is spread over 2 π.
14. The user equipment of claim 9 , wherein the reference symbol is for demodulation of the PBCH.
15. The base station of claim 9 , wherein the symbols include quadrature amplitude modulation symbols.