Non-orthogonal design for channel state information reference signals for a 5G air interface or other next generation network interfaces

• US 10,334,533 B2
• Filed: 11/02/2016
• Issued: 06/25/2019
• Est. Priority Date: 11/02/2016
• 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): Wong, Xavier Szewai
• Application Number:
  US15/341,927
• Publication Number:
  US 20180123848A1
• Time in Patent Office: 965 Days
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 52/143 Downlink power control

Abstract

Channel state information reference signal transmission can be used to estimate channel state information. Although resources needed for channel state information reference signals can be small, when multiple bandwidths are deployed within the same orthogonal frequency division multiplexing bandwidth, estimating the channel state information can comprise a channel state information reference signal resource grid for every bandwidth. Therefore, time-frequency resources for channel state information reference signals can be high and occupy a lot of bandwidth, thereby reducing the number of resources for data transmission. Therefore, a non-orthogonal design for channel state information reference signals for a 5G air interface can mitigate bandwidth loss in a 5G network.

Claims

1. A method, comprising:

transmitting, by a network device comprising a processor, a reference signal associated with a mobile device to the mobile device, wherein the network device is one of network devices of a wireless network;

in response to the transmitting the reference signal, receiving, from the mobile device by the network device, a channel state reference signal;

in response to the receiving the channel state reference signal, filtering, by the network device, the channel state reference signal to reduce a signal interference associated with the channel state reference signal, resulting in a filtered channel state reference signal;

determining, by the network device, a downlink transmission parameter based on the filtered channel state reference signal;

multiplexing, by the network device, a first bandwidth associated with the wireless network with a second bandwidth associated with the filtered channel state reference signal;

in response to the multiplexing, transmitting, by the network device, the downlink transmission parameter via a downlink control channel of the wireless network for application to downlink transmissions of the wireless network; and

after the transmitting the downlink transmission parameter, transmitting, by the network device, data via a data traffic channel of the wireless network.

2. The method of claim 1, further comprising:

multiplexing, by the wireless network device, the first bandwidth with the filtered channel state reference signal associated with a baseline bandwidth.

3. The method of claim 1, further comprising:

in response to decoding the first bandwidth, canceling, by the wireless network device, the channel state data associated with the second bandwidth.

4. The method of claim 3, wherein the filtered channel state reference signal comprises a channel quality indicator representative of a quality of a channel between a pair of the network devices of the wireless network.

5. The method of claim 3, wherein the filtered channel state reference signal comprises a resource indicator representative of a state of a channel between a pair of the network devices of the wireless network.

6. The method of claim 3, wherein the downlink transmission parameter comprises a power associated with the transmitting of the data.

7. The method of claim 3, wherein the downlink transmission parameter comprises a physical resource block associated with the transmitting of the data.

8. A network device, comprising:

a processor; and

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

transmitting a reference signal related to a mobile device to the mobile device via a network device of network devices of a wireless network;

in response to the transmitting of the reference signal, receiving channel state data, via a feedback channel, from the mobile device via the network device;

in response to the receiving the channel state data, filtering the channel state data to reduce a signal interference associated with the channel state data, resulting in filtered channel state data;

determining a downlink transmission parameter based on the filtered channel state data;

transmitting the downlink transmission parameter via a downlink control channel of the wireless network for application to downlink transmissions of the wireless network; and

in response to the transmitting of the downlink transmission parameter, transmitting data via a data traffic channel of the wireless network.

9. The network device of claim 8, wherein the data comprises a physical downlink shared channel.

10. The network device of claim 9, wherein the filtered channel state data comprises channel state data associated with a reference signal.

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

multiplexing a physical downlink shared channel with the reference signal associated the filtered channel state data.

12. The network device of claim 11, wherein the operations further comprise:

in response to the multiplexing, canceling an the signal interference associated with the reference signal associated with the filtered channel state data.

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

reducing a power of the reference signal associated with the filtered channel state data of an interfering bandwidth.

14. The network device of claim 9, wherein the receiving the channel state data results in a reception, wherein the transmitting the downlink transmission parameter results in a transmission, and wherein the reception overlaps the transmission.

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

sending a reference signal associated with a mobile device to the mobile device;

in response to the sending the reference signal, receiving channel state data, via a feedback channel, from the mobile device;

in response to the receiving the channel state data, filtering a signal associated with the channel state data to reduce an interference associated with the signal;

based on the channel state data, determining a downlink transmission parameter;

transmitting the downlink transmission parameter via a downlink control channel to be used for downlink transmissions via the downlink control channel; and

in response to the transmitting the downlink transmission parameter, transmitting data via a data traffic channel used for data transmissions.

16. The non-transitory machine-readable storage medium of claim 15, wherein the downlink transmission parameter comprises a modulation and coding parameter associated with the transmitting the data.

17. The non-transitory machine-readable storage medium of claim 16, wherein the operations further comprise:

based on a bandwidth associated with channel state data of a reference signal, matching a physical downlink shared channel to the channel state data of the reference signal.

18. The non-transitory machine-readable storage medium of claim 15, wherein the receiving the channel state data is concurrent with the transmitting the downlink transmission parameters.

19. The non-transitory machine-readable storage medium of claim 18, wherein the operations further comprise:

multiplexing a first signal of a physical downlink shared channel with the reference signal associated the channel state data.

20. The non-transitory machine-readable storage medium of claim 19, wherein the multiplexing comprises combining the first signal with the reference signal.