Device, network, and method for communications with fast adaptive transmission and reception
An embodiment of the present invention is disclosed including a method for adaptive reception, the method. The method includes receiving, by a user equipment (UE), an indicator from a first component carrier, the indicator indicating whether a second component carrier is in the On state. Receiving, by the UE, from the second component carrier a subframe wherein a reference signal is provided at a first symbol position of the subframe in a majority of subcarriers of the subframe. The second component carrier and the UE are then synchronized based on the reference signals. The UE then initiates a data link with the second component carrier.
1. A method for adaptive reception, the method comprising:
receiving, by a user equipment (UE), an indicator from a first component carrier, the indicator indicating that the UE should monitor a second component carrier;
receiving, by the UE, from the second component carrier a first subframe and a second subframe after the first subframe, the first and second subframes each comprising a plurality of subcarriers in the frequency domain and a first symbol position at the beginning of the subframes in the time domain, wherein a reference signal is provided at the first symbol position of the first and second subframes, the reference signal provided at more of the subcarriers of the first subframe than at the subcarriers of the second subframe;
determining, by the UE, at least one channel characteristic of a channel for the second component carrier based on the reference signals; and
initiating, by the UE, a data link with the second component carrier.
2. The method of claim 1 wherein the reference signal comprises one or more of a demodulation reference signal (DMRS), channel status indicator reference signal (CSI-RS), primary synchronization signal (PSS), secondary synchronization signal (SSS), cell-specific reference signal (CRS) and/or discovery reference signal (DRS).
3. The method of claim 1 wherein the reference signal has a higher power than other components of the first subframe.
4. The method of claim 1 wherein the first subframe further comprises additional reference signals at symbol positions other than the first symbol position.
5. The method of claim 1 wherein the first subframe further comprises a plurality of blank resource elements in a last symbol position of the first subframe.
6. The method of claim 1 wherein the reference signal comprises a plurality of precoded reference signals (RS).
7. The method of claim 6 wherein at least one of the precoded RS is precoded for automatic gain control (AGC).
8. The method of claim 6 wherein at least one of the precoded RS is precoded for demodulation of a data channel.
9. The method of claim 6 wherein at least one of the precoded RS is precoded for the UE.
10. The method of claim 6 wherein at least one of the precoded RS is precoded for the second component carrier.
11. The method of claim 6 wherein the precoded RS are indexed according to the associated time-frequency resources and the UE receives a RS index associated with a physical downlink shared channel (PDSCH), and the UE uses the precoded RS associated with the RS index to demodulate the PDSCH, and wherein the precoded RS associated with the RS index may be specific to the second component carrier or the UE.
12. The method of claim 11 wherein the UE uses the precoded RS having a highest signal to interference plus noise ratio for CSI measurements and feedback, wherein the RS index associated with the precoded RS having a highest signal to interference plus noise ratio is reported.
13. A method for adaptive reception, the method comprising:
transmitting, by a base station, over a first component carrier to a user equipment (UE), an indicator indicating that the UE should monitor a second component carrier;
transmitting, by the base station, over the from a second component carrier to the UE, a subframe comprising a plurality of subcarriers in the frequency domain and a first symbol position at the beginning of the subframes in the time domain, wherein a reference signal is provided at the first symbol position of the subframe in a majority of the subcarriers of the subframe;
receiving, by the base station, over the second component carrier from the UE, a first transmission in accordance with at least one channel characteristic of a channel for the second component carrier; and
transmitting, by the base station, over the second component carrier to the UE, a second transmission.
14. The method of claim 13 wherein the first and second component carriers are controlled by the base station.
15. The method of claim 13 wherein the first and second component carriers are connected by a fast backhaul.
16. The method of claim 13 wherein the first symbol position of the subframe in each of the subcarriers includes the reference signal.
17. The method of claim 13 wherein the reference signal comprises one or more of a demodulation reference signal (DMRS), channel status indicator reference signal (CSI-RS), primary synchronization signal (PSS), secondary synchronization signal (SSS), cell-specific reference signal (CRS) and/or discovery reference signal (DRS).
18. The method of claim 13 wherein the reference signal has a higher power than other components of the subframe.
19. The method of claim 13 wherein the reference signal comprises a plurality of precoded DMRS.
20. The method of claim 19 wherein at least one of the precoded DMRS is precoded for automatic gain control (AGC).
21. The method of claim 19 wherein at least one of the precoded DMRS is precoded for demodulation of a data channel.
22. The method of claim 19 wherein at least one of the precoded DMRS is precoded for the UE.
23. The method of claim 19 wherein at least one of the precoded DMRS is precoded for the second component carrier.
24. A user equipment (UE) comprising:
a processor; and
a computer readable storage medium storing programming for execution by the processor, the programming including instructions to:
receive an indicator from a first component carrier, the indicator indicating that the UE should monitor a second component carrier;
receive from the second component carrier a first subframe and a second subframe after the first subframe, the first and second subframes each comprising a plurality of subcarriers in the frequency domain and a first symbol position at the beginning of the subframes in the time domain, wherein a reference signal is provided at the first symbol position of the first and second subframes, the reference signal provided at more of the subcarriers of the first subframe than at the subcarriers of the second subframe;
determine at least one channel characteristic of a channel for the second component carrier based on the reference signals; and
initiate a data link with the second component carrier.
25. The UE of claim 24 wherein the reference signal comprises one or more of a demodulation reference signal (DMRS), channel status indicator reference signal (CSI-RS), primary synchronization signal (PSS), secondary synchronization signal (SSS), cell-specific reference signal (CRS) and/or discovery reference signal (DRS).
26. The UE of claim 24 wherein the reference signal has a higher power than other components of the first subframe.
27. The UE of claim 24 wherein the first subframe further comprises additional reference signals at symbol positions other than the first symbol position.
28. The UE of claim 24 wherein the first subframe further comprises a plurality of blank resource elements in a last symbol position of the first subframe.
29. The UE of claim 24 wherein the reference signal comprises a plurality of precoded DMRS.
30. The UE of claim 29 wherein at least one of the precoded DMRS is precoded for automatic gain control (AGC).
31. The UE of claim 29 wherein at least one of the precoded DMRS is precoded for demodulation of a data channel.
32. The UE of claim 29 wherein at least one of the precoded DMRS is precoded for the UE.
33. The UE of claim 29 wherein at least one of the precoded DMRS is precoded for the second component carrier.
34. The UE of claim 24 wherein the first symbol position is located at the beginning of the first and second subframes in the time domain, the reference signal is provided at the first symbol position of each of the subcarriers of the first subframe, and the reference signal is not provided at the first symbol position of any of the subcarriers of the second subframe.
35. The method of claim 1 wherein the first symbol position is located at the beginning of the first and second subframes in the time domain, the reference signal is provided at the first symbol position of each of the subcarriers of the first subframe, and the reference signal is not provided at the first symbol position of any of the subcarriers of the second subframe.