Method and system having reference signal design for new carrier types
View Patent ↗A method and network element for providing reference signals to a user equipment, the method determining a reference signal pattern at the network element; and sending the reference signals to the user equipment using a reference signal mapping based on the reference signal pattern. Further a method and user equipment for receiving reference signals from a network element, the method determining a reference signal mapping at the user equipment; and detecting the reference signals at the user equipment using the reference signal mapping.
1. A method for receiving reference signals at a user equipment from a network element, the method comprising:
determining, based on signaling by the network element, a reference signal mapping at the user equipment; and
detecting the reference signals at the user equipment using the reference signal mapping;
wherein the signaling indicates whether the reference signal mapping is fixed or flexible and further indicates a density, the density being one of a high density and a low density, and wherein the low density indicates fewer reference signals than the high density; and
wherein for a fixed mapping, a low density mapping is a reduced subset of reference signals from a high density mapping of set of reference signals, and for a flexible mapping, the low density mapping is a set of reference signals that is independent of the high density mapping of the set of reference signals.
2. The method of claim 1 , wherein the signaling utilizes an information element.
3. The method of claim 2 , wherein the information element is a Code Division Multiplexing Reference Signal Configuration information element.
4. The method of claim 1 , wherein the signaling provides for a value mapped to the reference signal pattern.
5. The method of claim 1 , wherein the reference signal mapping is received over broadcast signaling.
6. The method of claim 1 , wherein the signaling includes a type of the network element.
7. The method of claim 6 , wherein a lower density reference signal mapping is used for at least one of a small cell; a lower delay spread cell; and a longer coherence time of channels cell.
8. The method of claim 7 , wherein the small cell is a pico cell in a heterogeneous network.
9. The method of claim 1 , wherein the reference signal mapping differs between subframes.
10. The method of claim 1 , wherein the detecting uses reference signals from a previous subframe in addition to reference signals from a present subframe.
11. The method of claim 1 , wherein the mapping is based on a common reference signal mapping.
12. The method of claim 1 , wherein the mapping is based on a code division multiplexing mapping.
13. A user equipment for receiving reference signals from a network element, the user equipment comprising:
a processor,
wherein the processor is configured to:
determine, based on signaling by the network element, a reference signal mapping at the user equipment; and
detect the reference signals at the user equipment using the reference signal mapping;
wherein the signaling indicates whether the reference signal mapping is fixed or flexible and further indicates a density, the density being one of a high density and a low density, and wherein the low density ratio indicates fewer reference signals than the high density; and
wherein for a fixed mapping, a low density mapping is a reduced subset of reference signals from a high density mapping of set of reference signals, and for a flexible mapping, the low density mapping is a set of reference signals that is independent of the high density mapping of the set of reference signals.
14. The user equipment of claim 13 , wherein the signaling utilizes an information element.
15. The user equipment of claim 14 , wherein the information element is a Code Division Multiplexing Reference Signal Configuration information element.
16. The user equipment of claim 13 , wherein the signaling provides for a value mapped to the reference signal pattern.
17. The user equipment of claim 13 , wherein the reference signal mapping is received over broadcast signaling.
18. The user equipment of claim 13 , wherein the signaling includes a type of the network element.
19. The user equipment of claim 18 , wherein a lower density reference signal mapping is used for at least one of a small cell; a lower delay spread cell; and a longer coherence time of channels cell.
20. The user equipment of claim 19 , wherein the small cell is a pico cell in a heterogeneous network.
21. The user equipment of claim 13 , wherein the reference signal mapping differs between subframes.
22. The user equipment of claim 13 , wherein processor is configured to detect by using reference signals from a previous subframe in addition to reference signals from a present subframe.
23. The user equipment of claim 13 , wherein the mapping is based on a common reference signal mapping.
24. The user equipment of claim 13 , wherein the mapping is based on a code division multiplexing mapping.