TECHNIQUES FOR IMPROVING CONTROL CHANNEL CAPACITY

• US 20150319021A1
• Filed: 04/30/2015
• Published: 11/05/2015
• Est. Priority Date: 05/02/2014
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Xue, Feng, Luo, Tao, Wei, Yongbin
• Granted Patent: US 11,271,703 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/0012 arrangements for identifying the type of modulation
• CPC Class Codes: H04L 27/3483 using a modulation of the constellation points
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Aspects described herein relate to modulating control data in wireless communications. First control data for a first device can be modulated in an enhancement layer of a control data resource based at least in part on whether the control data resource includes second control data for a second device, and transmitted over the control data resource. A signal can be received from an access point comprising at least one control data resource. One of a plurality of modulation schemes utilized to modulate the at least one control data resource and an associated layer can be determined. The signal can be demodulated according to the one of the plurality of modulation schemes and the layer to obtain control data in the at least one control data resource.

Claims

1. A method for demodulating control data in wireless communications, comprising:

receiving, at a device, a signal from an access point comprising at least one control data resource;

determining one of a plurality of modulation schemes utilized to modulate the at least one control data resource;

determining a layer associated with modulation of control data for the device; and

demodulating the signal according to the one of the plurality of modulation schemes and the layer to obtain control data in the at least one control data resource.

2. The method of claim 1, wherein determining the layer is based at least in part on determining whether the at least one control data resource includes overlapping control data.

3. The method of claim 2, wherein determining whether the at least one control data resource includes overlapping control data is based at least in part on receiving an indication from the access point specifying whether the at least one control data resource includes overlapping control data.

4. The method of claim 2, wherein determining whether the at least one control data resource includes overlapping control data is based at least in part on performing multiple demodulations of the signal using at least two of the plurality of modulation schemes, applying a cyclic redundancy check (CRC) to each of the multiple demodulations, and determining which demodulation yields the at least one control data resource based on the respective CRC.

5. The method of claim 1, wherein determining the layer comprises determining the layer as an enhancement layer, and wherein demodulating the signal comprises obtaining a last two bits of the at least one control data resource corresponding to the enhancement layer.

6. The method of claim 5, wherein determining the layer as the enhancement layer is based at least in part on determining whether the at least one control data resource includes overlapping control data.

7. The method of claim 5, wherein determining the layer as the enhancement layer is based at least in part on determining that a channel feedback reported to the access point achieves a threshold.

8. The method of claim 1, wherein determining the layer comprises determining the layer as a base layer and an enhancement layer based at least in part on determining that the at least one control data resource does not include overlapping control data.

9. The method of claim 1, further comprising determining one or more resources for transmitting control data to the access point based at least in part on the layer.

10. The method of claim 1, further comprising determining a search space for a control channel corresponding to the at least one control data resource based at least in part on the layer.

11. An apparatus for demodulating control data in wireless communications, comprising:

a receiving component configured to receive, at a device, a signal from an access point comprising at least one control data resource;

a modulation determining component configured to determine one of a plurality of modulation schemes utilized to modulate the at least one control data resource and determine a layer associated with modulation of control data for the device; and

a demodulating component configured to demodulate the signal according to the one of the plurality of modulation schemes and the layer to obtain control data in the at least one control data resource.

12. The apparatus of claim 11, wherein the modulation determining component determines the layer based at least in part on determining whether the at least one control data resource includes overlapping control data, which is based at least in part on receiving an indication from the access point specifying whether the at least one control data resource includes overlapping control data.

13. The apparatus of claim 11, wherein the modulation determining component determines the layer based at least in part on determining whether the at least one control data resource includes overlapping control data, which is based at least in part on performing multiple demodulations of the signal using at least two of the plurality of modulation schemes, applying a cyclic redundancy check (CRC) to each of the multiple demodulations, and determining which demodulation yields the at least one control data resource based on the respective CRC.

14. The apparatus of claim 11, wherein the modulation determining component determines the layer as an enhancement layer, and wherein the demodulating component obtains a last two bits of the at least one control data resource corresponding to the enhancement layer.

15. The apparatus of claim 11, further comprising a control data transmitting component configured to determine one or more resources for transmitting control data to the access point based at least in part on the layer.

16. The apparatus of claim 11, wherein the receiving component is further configured to determine a search space for a control channel corresponding to the at least one control data resource based at least in part on the layer.

17. A method for modulating control data in wireless communications, comprising:

modulating first control data for a first device in an enhancement layer of a control data resource based at least in part on whether the control data resource includes second control data for a second device; and

transmitting at least the first control data as modulated over the control data resource.

18. The method of claim 17, wherein modulating the first control data for the first device in the enhancement layer of the control data resource is regardless of whether the control data resource includes the second control data for the second device.

19. The method of claim 17, further comprising:

modulating the second control data for the second device in a base layer of the control data resource;

performing a multiple layer modulation of the control data resource by superpositioning the base layer and the enhancement layer; and

transmitting the second control data with the first control data in the multiple layer modulation of the control data resource.

20. The method of claim 19, wherein modulating the first control data is based on 16-quadrature amplitude modulation, and wherein modulating the second control data is based on quadrature phase shift keying.

21. The method of claim 19, further comprising determining to group the first device and the second device for communicating the first control data and the second control data in the control data resource based at least in part on reported channel feedback from the first device and the second device.

22. The method of claim 17, further comprising:

modulating third control data for the first device in a base layer of the control data resource;

performing a multiple layer modulation of the control data resource by superpositioning the base layer and the enhancement layer; and

transmitting the third control data with the first control data in the multiple layer modulation of the control data resource.

23. The method of claim 17, further comprising transmitting an indication of whether the control data resource includes overlapped control data for multiple devices to the first device.

24. The method of claim 17, further comprising receiving uplink control data from the first device in resources determined based at least in part on modulating the first control data for the first device in the enhancement layer.

25. The method of claim 17, further comprising transmitting the first control data in a search space defined based at least in part on modulating the first control data for the first device in the enhancement layer.

26. An apparatus for modulating control data in wireless communications, comprising:

a modulating component configured to modulate first control data for a first device in an enhancement layer of a control data resource based at least in part on whether the control data resource includes second control data for a second device; and

a transmitting component configured to transmit at least the first control data as modulated over the control data resource.

27. The apparatus of claim 26, wherein the modulating component is further configured to modulate the second control data for the second device in a base layer of the control data resource, and perform a multiple layer modulation of the control data resource by superpositioning the base layer and the enhancement layer, and wherein the transmitting component is further configured to transmit the second control data with the first control data in the multiple layer modulation of the control data resource.

28. The apparatus of claim 27, further comprising a device grouping component configured to determine to group the first device and the second device for communicating the first control data and the second control data in the control data resource based at least in part on reported channel feedback from the first device and the second device.

29. The apparatus of claim 26, further comprising a control data receiving component configured to receive uplink control data from the first device in resources determined based at least in part on modulating the first control data for the first device in the enhancement layer.

30. The apparatus of claim 26, wherein the transmitting component is further configured to transmit the first control data in a search space defined based at least in part on modulating the first control data for the first device in the enhancement layer.