Adaptive channel state information reference signal configurations for a 5G wireless communication network or other next generation network

• US 10,237,032 B2
• Filed: 01/06/2017
• Issued: 03/19/2019
• Est. Priority Date: 01/06/2017
• Status: Active Grant

• Current Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Original Assignee: AT&T Intellectual Property I LP (AT&T, Inc.)
• Inventors: Nammi, SaiRamesh, Wang, Xiaoyi, Ghosh, Arunabha
• Primary Examiner(s): Hsu, Alpus
• Assistant Examiner(s): Thai, Camquyen
• Application Number:
  US15/400,379
• Publication Number:
  US 20180198579A1
• Time in Patent Office: 802 Days
• Field of Search: None
• CPC Class Codes: H04L 27/26025 Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking allocating sub-channels of the transmission path H04L5/003
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0092 Indication of how the channel is divided

Abstract

In mixed numerology case, the performance of a physical downlink shared channel (PDSCH) can be improved by multiplexing PDSCH of one numerology with the channel state information reference signals (CSI-RS) of the other numerology and use of an advanced receiver. However, due to the interference from the PDSCH of the other numerology, the channel estimation for the underlying UE can be impacted if the CSI-RS is corrupted. An adaptive CSI-RS configuration can be deployed where the CSI-RS density is adapted based on the PDSCH transmission of the other numerology. Namely, based on the scheduling decision of the other numerology, the CSI-RS density can be changed. Thus, the impact on channel estimation can be minimized when the data channel of one numerology is multiplexed with the CSI-RS of the other numerology.

Claims

1. A method, comprising:

deploying, by a network device comprising a processor, a first subcarrier spacing and a second subcarrier spacing, wherein the second subcarrier spacing is different from the first subcarrier spacing;

based on a physical downlink shared channel location of the second subcarrier spacing, adjusting, by the network device, a number of reference symbols associated with channel state data reference signals, resulting in an adjusted number of the reference symbols;

based on the adjusted number of the reference signals, configuring, by the network device, a resource block associated with the second subcarrier spacing, resulting in a resource block pattern, wherein the configuring comprises generating a time value for use with the adjusted number of the reference symbols, and wherein the resource block is allocated for a transmission of channel state data; and

sending, by the network device, the resource block pattern, the time value, and the adjusted number of the reference symbols to a mobile device.

2. The method of claim 1, wherein the physical downlink shared channel location is a first physical downlink shared channel location, and wherein the number of the reference symbols is indicated on the resource block associated with a second physical downlink shared channel location of the first subcarrier spacing.

3. The method of claim 2, wherein the second subcarrier spacing is an interfering subcarrier spacing.

4. The method of claim 3, wherein the number of reference symbols comprise a channel quality indicator representative of a quality of a channel between a pair of network devices of a wireless network.

5. The method of claim 4, wherein physical downlink data associated with the second physical downlink shared channel location of the first subcarrier spacing is combined with the number of the reference symbols.

6. The method of claim 1, further comprising:

sending, by the network device, the adjusted number of the reference symbols via a physical layer signaling.

7. The method of claim 6, wherein the sending comprises a request to send the channel state data associated with the channel state data reference signals.

8. The method of claim 7, wherein the request comprises an instruction to send the channel state data at irregular intervals.

9. The method of claim 7, wherein the request is a first request, and wherein the first request comprises a second request to send the channel state data, from the network device, on demand.

10. A network device, comprising:

a processor; and

a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising;

scheduling a first subcarrier spacing within a first part of an orthogonal frequency division multiplexing bandwidth;

scheduling a second subcarrier spacing within a second part of the orthogonal frequency division multiplexing bandwidth, wherein the second part is different than the first part;

based on a physical downlink shared channel of the second subcarrier spacing, adjusting variable reference symbols of channel state data reference signals, resulting in adjusted variable reference symbols of the channel state data reference signals;

based on the adjusted variable reference symbols, configuring a resource block associated with the second subcarrier spacing, resulting in a resource block pattern, wherein the resource block is allocated for a transmission of channel state data; and

sending first data associated with the adjusted variable reference symbols of the channel state data reference signals and second data associated with the resource block pattern to a mobile device.

11. The network device of claim 10, wherein the adjusting comprises increasing a number of the variable reference symbols of the channel state data reference signals.

12. The network device of claim 10, wherein the adjusting comprises decreasing a number of the variable reference symbols of the channel state data reference signals.

13. The network device of claim 12, wherein the operations further comprise:

sending the first data to the network device via a physical layer signaling.

14. The network device of claim 10, wherein the operations further comprise:

based on time data associated with the first subcarrier spacing, configuring the resource block associated with the network device, resulting in configuration data associated with the resource block.

15. The network device of claim 14, wherein the configuring comprises increasing the variable reference symbols of the channel state data reference signals.

16. The network device of claim 15, wherein the operations further comprise:

communicating, via radio resource control signaling, the time data and the configuration data to the mobile device.

17. A non-transitory machine-readable storage medium, comprising executable instructions that, when executed by a processor, facilitate performance of operations, comprising:

generating a first subcarrier spacing within a first part of an orthogonal frequency division multiplexing bandwidth;

generating a second subcarrier spacing within a second part of the orthogonal frequency division multiplexing bandwidth, wherein the first subcarrier spacing is different than the second subcarrier spacing;

based on a physical downlink shared channel location of the second subcarrier spacing, increasing symbols of channel state data reference signals, resulting in additional symbols of the channel state data reference signals other than the symbols of the channel state data reference signals;

in response to the increasing the symbols of the channel state data reference signals, configuring a resource block associated with the second subcarrier spacing, resulting in a resource block pattern associated with a time value for use of the additional symbols, wherein the resource block is allocated for a transmission of channel state data; and

transmitting data associated with the additional symbols of the channel state data reference signals, the resource block pattern, and the time value to a mobile device.

18. The non-transitory machine-readable storage medium of claim 17, wherein the increasing the symbols of the channel state data reference signals is based on scheduling parameters received from a base station device.

19. The non-transitory machine-readable storage medium of claim 18, wherein the increasing the symbols of the channel state data reference signals is performed in response to determining that the mobile device is experiencing a first signal-to-noise ratio that is higher than a second signal-to-noise ratio.

20. The non-transitory machine-readable storage medium of claim 17, wherein the increasing the symbols of the channel state data reference signals is performed in conjunction with increasing a radio resource control signal.