Transmitter for transmitting discovery signals, a receiver and methods therein
A transmitter and a method therein for transmitting discovery signals to a receiver. The transmitter and the receiver arc comprised in a radio communications system. The transmitter transmits two or more discovery signals over two or more directions. Each discovery signal is configured to span over a fraction of a carrier bandwidth.
1. A method, in a transmitter, for transmitting discovery signals to a receiver, wherein the transmitter and the receiver are comprised in a radio communications system, the method comprising:
transmitting two or more discovery signals over two or more directions;
wherein each discovery signal is configured to span over a fraction of a carrier bandwidth, the carrier bandwidth is separated into sub-bands, and each of the two or more discovery signals is configured to span over one sub-band.
2. The method of claim 1 , wherein the transmitting the two or more discovery signals comprises transmitting the two or more discovery signals in a single symbol.
3. The method of claim 2 , wherein the transmitting the two or more discovery signals further comprises:
multiplexing, in a frequency-domain, a plurality of discovery signals for a plurality of directions; and
transmitting the multiplexed plurality of discovery signals in the single symbol.
4. The method of claim 1 , wherein the transmitting the two or more discovery signals comprises transmitting the two or more discovery signals in two or more symbols.
5. The method of claim 4 , wherein the transmitting the two or more discovery signals further comprises:
multiplexing, in a frequency-domain, a plurality of discovery signals for a plurality of directions; and
transmitting the multiplexed plurality of discovery signals in the two or more symbols.
6. The method of claim 1 , wherein the transmitting the two or more discovery signals comprises transmitting the two or more discovery signals together with information relating to at least one of:
information indicating a beam direction;
information indicating a frequency offset to a carrier center; and
information indicating the transmitter.
7. The method of claim 1 , wherein the transmitting the two or more discovery signals comprises cyclically, over time, transmitting the two or more discovery signals into different directions.
8. The method of claim 1 , wherein the two or more discovery signals are synchronization signals.
9. The method of claim 1 , wherein said transmitting comprises transmitting each of the two or more discovery signals over a frequency carrier, and wherein each discovery signal is configured to span over a fraction of a bandwidth of the respective frequency carrier.
10. A transmitter for transmitting discovery signals to a receiver, wherein the transmitter and the receiver are comprised in a radio communications system, the transmitter comprising:
one or more processing circuits operative to control the transmitter to transmit two or more discovery signals over two or more directions;
wherein each discovery signal is configured to span over a fraction of a carrier bandwidth, the carrier bandwidth is separated into sub-bands, and each of the two or more discovery signals is configured to span over one sub-band.
11. The transmitter of claim 10 , wherein the transmitter is configured to transmit the two or more discovery signals in a single symbol.
12. The transmitter of claim 11 , wherein the transmitter is configured to:
multiplex, in a frequency-domain, a plurality of discovery signals for a plurality of directions;
transmit the multiplexed plurality of discovery signals in the single symbol.
13. The transmitter of claim 10 , wherein the transmitter is configured to transmit the two or more discovery signals in two or more symbols.
14. The transmitter of claim 13 , wherein the transmitter is configured to:
multiplex, in a frequency-domain, a plurality of discovery signals for a plurality of directions;
transmit the multiplexed plurality of discovery signals in the two or more symbols.
15. The transmitter of claim 10 , wherein the transmitter is configured to transmit the two or more discovery signal together with information relating to at least one of:
information indicating a beam direction;
information indicating a frequency offset to a carrier center; and
information indicating the transmitter.
16. The transmitter of claim 10 , wherein the transmitter is configured to cyclically, over time, transmit the two or more discovery signals into different directions.
17. The transmitter of claim 10 , wherein the two or more discovery signals are synchronization signals.
18. A method, in a receiver, for receiving discovery signals from a transmitter, wherein the transmitter and the receiver are comprised in a radio communications system, the method comprising:
receiving, from the transmitter, at least a first discovery signal of two or more discovery signals that have been transmitted into two or more directions;
wherein each discovery signal is configured to span over a fraction of a carrier bandwidth, the carrier bandwidth is separated into sub-bands, and each of the two or more discovery signals is configured to span over one sub-band.
19. The method of claim 18 , wherein the receiving comprises receiving the first discovery signal in a single symbol.
20. The method of claim 18 , wherein the receiving comprises receiving two or more discovery signals in two or more symbols.
21. The method of claim 18 , wherein the receiving comprises receiving at least the first discovery signal together with information relating to at least one of:
information indicating a beam direction;
information indicating a frequency offset to a carrier center; and
information indicating the transmitter.
22. The method of claim 18 , wherein the receiving comprises cyclically, over time, receiving the first discovery signal from different directions.
23. The method of claim 18 , wherein at least the first discovery signal is a synchronization signal.
24. A receiver for receiving discovery signals from a transmitter, wherein the transmitter and the receiver are comprised in a radio communications system, the receiver comprising:
a receiving circuit configured to receive, from the transmitter, at least a first discovery signal of two or more discovery signals that have been transmitted into two or more directions;
wherein each discovery signal is configured to span over a fraction of a carrier bandwidth, the carrier bandwidth is separated into sub-bands, and each of the two or more discovery signals is configured to span over one sub-band.
25. The receiver of claim 24 , wherein the receiving circuit further is configured to receive at least the first discovery signal in a single symbol.
26. The receiver of claim 24 , wherein the receiving circuit further is configured to receive two or more discovery signals in two or more symbols.
27. The receiver of claim 24 , wherein the receiver is configured to receive at least the first discovery signal together with information relating to at least one of:
information indicating a beam direction;
information indicating a frequency offset to a carrier center; and
information indicating the transmitter.
28. The receiver of claim 24 , wherein the receiver is further configured to cyclically, over time, receive at least the first discovery signal from different directions.
29. The receiver of claim 24 , wherein at least the first discovery signal is a synchronization signal.