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1. (WO2017136039) TECHNIQUES FOR CONFIGURING REFERENCE SIGNALS IN LOW LATENCY WIRELESS COMMUNICATIONS
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CLAIMS

What is claimed is:

1. A method for determining a configuration of reference signal (RS) resources in wireless communications, comprising:

receiving, from an access point, a scheduling grant of resources, wherein the scheduling grant indicates one or more parameters related to transmission locations of one or more RSs;

determining RS resource locations for the one or more RSs based at least in part on the one or more parameters; and

receiving the one or more RSs over the RS resource locations.

2. The method of claim 1 , wherein the scheduling grant indicates a process number corresponding to channel state information (CSI)-RS transmission, wherein determining the RS resource locations includes determining at least a transmission time interval (TTI) during which the CSI-RS is transmitted by the access point based at least in part on the process number, and wherein receiving the one or more RSs includes receiving, from the access point, the CSI-RS during the TTI.

3. The method of claim 2, further comprising:

generating one or more measurements of the CSI-RS;

receiving an uplink scheduling grant for reporting CSI feedback for the CSI; and reporting the one or more measurements as the CSI feedback to the access point in a subsequent TTI based on the uplink scheduling grant.

4. The method of claim 3, wherein reporting the one or more measurements includes multiplexing the one or more measurements with data for transmitting over a channel corresponding to the uplink scheduling grant.

5. The method of claim 3, wherein reporting the one or more measurements includes transmitting the one or more measurements over a segment of a channel corresponding to the uplink scheduling grant.

6. The method of claim 5, wherein the uplink scheduling grant indicates an index of the segment.

7. The method of claim 2, further comprising determining a number of antenna ports corresponding to the process number, wherein the CSI-RS are received over the number of antenna ports.

8. The method of claim 7, further comprising determining one or more RS tones in frequency that correspond to the number of antenna ports, wherein the CSI-RS are received over the one or more RS tones.

9. The method of claim 8, wherein determining the one or more RS tones is based at least in part on whether a user equipment (UE)-RS is transmitted in the TTI.

10. The method of claim 1, wherein the scheduling grant further indicates whether a user equipment (UE)-RS is to be received in a transmission time interval (TTI), wherein determining the RS resource locations includes determining at least a transmission time interval (TTI) for receiving the UE-RS, and wherein receiving the one or more RSs includes receiving, from the access point, the UE-RS during the TTI.

1 1. The method of claim 10, wherein determining at least the TTI is based at least in part on the one or more parameters specified in the scheduling grant.

12. The method of claim 10, further comprising receiving, from the access point, a channel state information (CSI)-RS in the TTI.

13. The method of claim 1 , further comprising reporting cell-specific reference signal (CRS) measurements to the access point, wherein the one or more parameters indicate RS frequency tones for the one or more RSs that are based on the CRS measurements.

14. The method of claim 1 , wherein the scheduling grant further indicates whether channel state information (CSI)-interference management (IM) is enabled for a transmission time interval (TTI), and further comprising performing interference measurements or rate matching based on configured CSI-IM resource locations.

15. The method of claim 14, further comprising determining the configured CSI-IM resource locations based on receiving an indication of the configured CSI-IM resource locations within the TTI in a radio resource control (RRC) configuration.

16. The method of claim 1 , further comprising determining a level of interference from one or more access points over multiple transmission time intervals (TTI) based at least in part on demodulating and decoding control signals within the multiple TTIs, obtaining channel estimates per each of the multiple TTIs based on remodulating the control signals to eliminate control data, and subtracting the channel estimates.

17. A method for specifying a configuration of resources for transmitting reference signals (RS) in wireless communications, comprising:

generating a scheduling grant of resources for communicating with a user equipment (UE), wherein the scheduling grant indicates one or more parameters related to transmitting one or more RSs;

transmitting the scheduling grant to the UE; and

transmitting the one or more RSs over RS resources based at least in part on the one or more parameters.

18. The method of claim 17, wherein the scheduling grant indicates a process number corresponding to channel state information (CSI)-RS transmission, and wherein transmitting the one or more RSs includes transmitting the CSI-RS during a transmission time interval (TTI) corresponding to the process number.

19. The method of claim 18, further comprising transmitting an uplink scheduling grant to the UE for transmitting CSI feedback.

20. The method of claim 19, further comprising receiving, from the UE in a subsequent TTI based on the uplink scheduling grant, CSI feedback corresponding to the CSI-RS.

21. The method of claim 20, wherein receiving the CSI feedback includes receiving the CSI feedback multiplexed with data over a channel corresponding to the uplink scheduling grant.

22. The method of claim 20, wherein the uplink scheduling grant indicates an index of a segment of the channel, where other segments are assigned to other UEs, and wherein receiving the CSI feedback includes receiving the CSI feedback in the segment of the channel.

23. The method of claim 18, wherein transmitting the CSI-RS includes transmitting the CSI-RS over a number of antenna ports corresponding to the process number.

24. The method of claim 23, further comprising signaling a plurality of process numbers and associated parameters to the UE using radio resource control (RRC) signaling), wherein transmitting the CSI-RS is based on the associated parameters for the process number.

25. The method of claim 23, wherein transmitting the CSI-RS includes transmitting the CSI-RS over a channel in frequency that corresponds to the number of antenna ports.

26. The method of claim 18, further comprising transmitting, to the UE, a user equipment (UE)-RS in the TTI.

27. The method of claim 17, further comprising:

receiving an estimate of a channel coherence bandwidth from the UE corresponding to a cell-specific reference signal (CRS) transmission; and

determining a number of frequency tones for the one or more RSs based at least in part on the estimate of the channel coherence bandwidth, wherein transmitting the one or more RSs is based on the number of frequency tones.

28. The method of claim 17, wherein the scheduling grant indicates whether channel state information (CSI)-interference management (IM) is enabled for a transmission time interval (TTI).

29. An apparatus for wireless communications, comprising:

a transceiver for communicating one or more wireless signals via one or more antennas;

a memory configured to store instructions; and

one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:

receive, from an access point, a scheduling grant of resources, wherein the scheduling grant indicates one or more parameters related to transmission locations of one or more reference signals (RS);

determine RS resource locations for the one or more RSs based at least in part on the one or more parameters; and

receive the one or more RSs over the RS resource locations.

30. An apparatus for wireless communications, comprising:

a transceiver for communicating one or more wireless signals via one or more antennas;

a memory configured to store instructions; and

one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:

generate a scheduling grant of resources for communicating with a user equipment (UE), wherein the scheduling grant indicates one or more parameters related to communicating one or more reference signals (RS);

transmit the scheduling grant to the UE; and

transmit the one or more RSs over RS resources based at least in part on the one or more parameters.