MULTI-ANTENNA TRANSMISSION PROTOCOLS FOR HIGH DOPPLER CONDITIONS

• US 20180324815A1
• Filed: 05/05/2017
• Published: 11/08/2018
• Est. Priority Date: 05/05/2017
• 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, Ghosh, Arunabha
• Granted Patent: US 10,462,801 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0482 Adaptive codebooks
• CPC Class Codes: H04B 7/0486 taking channel rank into account
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 72/0466 the resource being a scrambling code
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/51 based on terminal or device properties
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

In response to a metric (e.g., Doppler metric) exceeding a threshold, a network node device can facilitate transmitting a message instructing a user equipment to enable reception of transmission signals having a precoding rank value of one. The network node device can send a reference signal having the precoding rank value of one, and receive feedback from the user equipment comprising an indicator of channel quality. Optionally, in response to the metric exceeding a threshold, the network node device can facilitate transmitting a message instructing the user equipment to respond to a reference signal by providing feedback comprising a first indicator of rank having a value of one, and a second indicator of channel quality.

Claims

1. A network node device, comprising:

a processor; and

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

determining a metric representative of a shift in a received frequency of a signal determined to have been received by a user equipment and an actual frequency determined to have been used to transmit the signal;

in response to the metric being determined to exceed a threshold, facilitating transmitting, to the user equipment, a message instructing the user equipment to enable a reception of transmission signals having a precoding rank value of one, wherein the precoding rank value of one indicates transmissions of data comprising same content concurrently from the network node device to the user equipment;

facilitating transmitting, to the user equipment, a reference signal specific to the user equipment and having the precoding rank value of one;

receiving, from the user equipment, feedback comprising an indicator of channel quality applicable to a quality of a channel between the network node device and the user equipment;

based on the indicator of channel quality, determining a transmission scheduling parameter related to a transmission protocol for further transmissions from the network node device to the user equipment; and

facilitating transmitting, to the user equipment, the transmission scheduling parameter.

2. The network node device of claim 1, wherein the operations further comprise facilitating transmitting, to the user equipment, traffic data based on the transmission protocol.

3. The network node device of claim 1, wherein the determining the metric comprises obtaining speed measurements of the user equipment at multiple times, and wherein the metric comprises an average of the speed measurements.

4. The network node device of claim 1, wherein the determining the metric comprises determining a rate of change of a characteristic of an uplink channel from the user equipment to the network node device.

5. The network node device of claim 1, wherein the determining the metric comprises determining a rate of change of channel quality information of previous transmissions from the network node device to the user equipment, the previous transmissions occurring prior to the determining the metric.

6. The network node device of claim 1, wherein the transmission scheduling parameter comprises a modulation and coding parameter applicable to modulation and coding of data streams for the further transmissions from the network node device to the user equipment.

7. The network node device of claim 1, wherein the indicator of channel quality comprises a first indicator of channel quality, and the message instructing the user equipment further comprises an instruction to exclude from the feedback:

a second indicator of rank representative of a number of different data streams transmitted between the network node device and the user equipment, and

a third indicator of channel state information used to select a precoding matrix for the further transmissions from the network node device to the user equipment.

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;

determining a metric representative of a shift in a received frequency of a signal determined to have been received by a user equipment and an actual frequency determined to have been employed to transmit the signal;

in response to the metric being determined to exceed a threshold, facilitating transmitting, to the user equipment, a message instructing the user equipment to respond to a reference signal by including channel state information feedback relating to a transmission protocol for transmissions between the user equipment and the network device, the channel state information feedback comprising;

a first indicator of rank having a value of one, wherein the first indicator of rank is representative of a number of different data streams transmitted between the network device and the user equipment, and

a second indicator of channel quality applicable to a quality of the channel between the network device and the user equipment;

facilitating transmitting, to the user equipment, the reference signal;

receiving, from the user equipment, the channel state information feedback;

decoding the channel state information feedback resulting in decoded channel state information feedback;

based on the decoded channel state information feedback, determining a transmission scheduling parameter related to the transmission protocol; and

facilitating transmitting, to the user equipment, the transmission scheduling parameter.

9. The network device of claim 8, wherein the operations further comprise, facilitating transmitting, to the user equipment, traffic data based on the transmission protocol.

10. The network device of claim 8, wherein the determining the metric comprises obtaining speed measurements of the user equipment at different times, and wherein the metric comprises a mean or a median of the speed measurements.

11. The network device of claim 8, wherein the determining the metric comprises determining a rate of change of a characteristic of an uplink channel from the user equipment to the network device.

12. The network device of claim 8, wherein the determining the metric comprises determining a rate of change of channel quality information of the transmissions between the network device and the user equipment.

13. The network device of claim 8, wherein the transmission scheduling parameter comprises a modulation and coding parameter applicable to modulation and coding of data streams for the transmissions between the user equipment and the network device.

14. The network device of claim 8, wherein the message instructing the user equipment comprises an instruction to exclude, from the channel state information feedback report, a third indicator of channel state information used to select a precoding matrix for the transmissions between the network device and the user equipment.

15. A network node device, comprising:

a processor; and

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

determining a metric representative of a shift in a received frequency of a signal determined to have been received by a user equipment and an actual frequency determined to have been used to transmit the signal;

in response to the metric being determined to exceed a threshold, facilitating transmitting, to the user equipment, a message instructing the user equipment to enable a reception of transmission signals having a precoding rank value of one, wherein the precoding rank value of one indicates transmissions of data comprising same content concurrently from the network node device to the user equipment;

facilitating transmitting, to the user equipment, reference signals specific to the user equipment and having the precoding rank value of one;

receiving, from the user equipment, feedback comprising indicators of channel quality, determined from evaluating each of the reference signals, wherein the indicators of channel quality are applicable to a quality of a channel between the network node device and the user equipment;

based on the feedback, selecting one of the indicators of channel quality to determine a transmission scheduling parameter related to a transmission protocol for further transmissions from the network node device to the user equipment; and

facilitating transmitting, to the user equipment, the transmission scheduling parameter.

16. The network node device of claim 15, wherein the operations further comprise facilitating transmitting, to the user equipment, traffic data based on the transmission protocol.

17. The network node device of claim 15, wherein the determining the metric comprises obtaining speed measurements of the user equipment at multiple times, and wherein the metric comprises an average of the speed measurements.

18. The network node device of claim 15, wherein the determining the metric comprises determining a rate of change of a characteristic of an uplink channel from the user equipment to the network node device.

19. The network node device of claim 15, wherein the determining the metric comprises determining a rate of change of channel quality information of previous transmissions from the network node device to the user equipment, the previous transmissions occurring prior to the determining the metric.

20. The network node device of claim 15, wherein the message instructing the user equipment further comprises an instruction to exclude from the feedback:

a first indicator of rank representative of a number of different data streams transmitted between the network node device and the user equipment, and

a second indicator of channel state information used to select a precoding matrix for the further transmissions from the network node device to the user equipment.