Systems and methods for adaptation in a wireless network

• US 10,200,168 B2
• Filed: 08/23/2016
• Issued: 02/05/2019
• Est. Priority Date: 08/27/2015
• Status: Active Grant

• Current Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Futurewei Technologies Incorporated (Huawei Investment & Holding Co., Ltd.)
• Inventors: Liu, Jialing, Xiao, Weimin, Cheng, Qian
• Primary Examiner(s): Zhao, Wei
• Application Number:
  US15/244,783
• Publication Number:
  US 20170063503A1
• Time in Patent Office: 896 Days
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0486 taking channel rank into account
• CPC Class Codes: H04B 7/10 Polarisation diversity; Directional diversity
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/03 Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• 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 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/542 using measured or perceived quality

Abstract

An embodiment method of network node operation includes indicating, by a first network node, to a first UE, a first number of REs in a first set of RBs for a first reference signal, transmitting, by the first network node, to the first UE, the first reference signal in accordance with the first number of REs and a first precoding in a first subframe, receiving, by the first network node, from the first UE, a report indicating a first MCS in accordance with a level of signal and interference measured by the first UE, wherein the measurement is restricted to the first reference signal, and transmitting, by the first network node, a first data with the indicated first MCS and the first precoding in a second subframe, the first data being transmitted on a second number of REs in the first set of RBs in the second subframe.

Claims

1. A method of network node operation, the method comprising:

indicating, by a first network node, to a first user equipment (UE), a first number of resource elements (REs) in a first set of resource blocks (RBs) for a first reference signal;

transmitting, by the first network node, to the first UE, the first reference signal in accordance with the first number of REs and a first precoding in a first transmission time interval (TTI);

receiving, by the first network node, from the first UE, a report indicating a channel quality indicator (CQI) determined in accordance with a level of signal and a level of interference measured by the first UE, wherein the CQI measurement is based on the first reference signal; and

transmitting, by the first network node, a first data having a modulation and coding scheme (MCS) in accordance with the CQI, the first data being transmitted on a second number of REs in the first set of RBs in a second TTI and having the first precoding.

2. The method of claim 1, wherein the second number of REs is larger than the first number of REs.

3. The method of claim 1, wherein the first reference signal is a probing reference signal.

4. The method of claim 1, wherein the first reference signal is a non-zero-power channel state information reference signal (NZP CSI-RS).

5. The method of claim 1, wherein the first network node transmits the first reference signal with a first rank, and wherein a second network node transmits a second reference signal to a second UE in the first TTI with a second precoding and a second rank on the same REs as the first reference signal in the RBs belonging to the first set of RBs of the first network node in the first TTI.

6. The method of claim 5, further comprising transmitting, by the first network node, information regarding configuration of the first reference signal to the second network node, wherein the information regarding configuration of the first reference signal indicates to the second network node that the second network node is to transmit the second reference signal on the same REs as the first reference signal in the RBs belonging to the first set of RBs of the first network node in the first TTI.

7. The method of claim 5, wherein the second network node transmits a second data to the second UE in the second TTI with the second precoding and the second rank, and wherein, on the RBs belonging to the first set of RBs of the first network node, the second data occupies the same REs as the first data.

8. The method of claim 5, wherein a time interval between the first TTI and the second TTI is configured as common for the first network node and the second network node.

9. The method of claim 6, wherein the information regarding configuration of the first reference signal further indicates to the second network node that the second network node is to transmit a second data with a second MCS at the same time the first network node transmits the first data.

10. The method of claim 6, wherein the information regarding configuration of the first reference signal further indicates to the second network node that the second network node is to transmit a second data with the same bundling of RBs used by the first network node to transmit the first data.

11. The method of claim 1, wherein the first network node applies the MCS to at least one additional data transmitted after transmission of the first data.

12. The method of claim 1, wherein the first reference signal is associated with at least one of:

a trigger indicating to the first UE that the first UE is to measure the level of signal and the level of interference and determine the CQI appropriate for the level of signal and the level of interference;

a designation of at least one restriction on the first UE'"'"'s measurement of the level of interference;

a designation of at least one restriction on the first UE'"'"'s measurement of the level of signal;

a designation of a transmission rank associated with a first rank of the first reference signal;

a designation of an uplink channel on which the first UE is to transmit the report;

a designation of a difference in time between transmission of the first reference signal and transmission of the first data;

or

a designation of an amount of bundling of RBs to be used by the first network node to transmit the first data.

13. A first network node comprising:

a processor; and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

indicate, to a first user equipment (UE), a first number of resource elements (REs) in a first set of resource blocks (RBs) for a first reference signal;

transmit, to the first UE, the first reference signal in accordance with the first number of REs and a first precoding in a first TTI;

receive, from the first UE, a report indicating a channel quality indicator (CQI) determined in accordance with a level of signal and a level of interference measured by the first UE, wherein the CQI measurement is based on the first reference signal; and

transmit a first data having a modulation and coding scheme (MCS) in accordance with the CQI, the first data being transmitted on a second number of REs in the first set of RBs in a second TTI and having the first precoding.

14. The first network node of claim 13, wherein the second number of REs is larger than the first number of REs.

15. The first network node of claim 13, wherein the first reference signal is a probing reference signal.

16. The first network node of claim 13, wherein the first reference signal is a non-zero-power channel state information reference signal (NZP CSI-RS).

17. The first network node of claim 13, wherein the first network node transmits the first reference signal with a first rank, and wherein a second network node transmits a second reference signal to a second UE in the first TTI with a second precoding and a second rank on the same REs as the first reference signal in the RBs belonging to the first set of RBs of the first network node in the first TTI.

18. The first network node of claim 17, further comprising instructions to transmit information regarding configuration of the first reference signal to the second network node, wherein the information regarding configuration of the first reference signal indicates to the second network node that the second network node is to transmit the second reference signal on the same REs as the first reference signal in the RBs belonging to the first set of RBs of the first network node in the first TTI.

19. The first network node of claim 17, wherein the second network node transmits a second data to the second UE in the second TTI with the second precoding and the second rank, and wherein, on the RBs belonging to the first set of RBs of the first network node, the second data occupies the same REs as the first data.

20. The first network node of claim 17, wherein a time interval between the first TTI and the second TTI is configured as common for the first network node and the second network node.

21. The first network node of claim 18, wherein the information regarding configuration of the first reference signal further indicates to the second network node that the second network node is to transmit a second data with a second MCS at the same time the first network node transmits the first data.

22. The first network node of claim 18, wherein the information regarding configuration of the first reference signal further indicates to the second network node that the second network node is to transmit a second data with the same bundling of RBs used by the first network node to transmit the first data.

23. The first network node of claim 13, further comprising instructions to apply the indicated first MCS to at least one additional data transmitted after transmission of the first data.

24. The first network node of claim 13, wherein the first reference signal is associated with at least one of:

a trigger indicating to the first UE that the first UE is to measure the level of signal and the level of interference and determine the first MCS appropriate for the level of signal and the level of interference;

a designation of at least one restriction on the first UE'"'"'s measurement of the level of interference;

a designation of at least one restriction on the first UE'"'"'s measurement of the level of signal;

a designation of a precoding matrix indicator (PMI) associated with the first precoding of the first reference signal;

a designation of a transmission rank associated with a first rank of the first reference signal;

a designation of an uplink channel on which the first UE is to transmit the report;

a designation of a difference in time between transmission of the first reference signal and transmission of the first data;

or

a designation of an amount of bundling of RBs to be used by the first network node to transmit the first data.

25. A method of network node operation, the method comprising:

receiving, by a first user equipment (UE), an indication of a first number of resource elements (REs) in a first set of resource blocks (RBs);

receiving, by the UE, a first reference signal over the first number REs, the first reference signal being associated with a first precoding;

measuring, by the UE, a channel quality indicator (CQI) based on the first reference signal;

transmitting, by the UE, a report indicating the CQI to a base station; and

receiving, by the UE, a first data having a modulation and coding scheme (MCS) in accordance with the CQI, the first data being transmitted on a second number of REs in the first set of RBs and having the first precoding.

26. A first user equipment (UE) comprising:

a processor; and

a non-transitory computer readable storage medium storing programming for execution by the processor, the programming including instructions to;

receive an indication of a first number of resource elements (REs) in a first set of resource blocks (RBs);

receive a first reference signal over the first number REs, the first reference signal being associated with a first precoding;

measure a channel quality indicator (CQI) based on the first reference signal;

transmit a report indicating the CQI to a base station; and

receive a first data having a modulation and coding scheme (MCS) in accordance with the CQI, the first data being transmitted on a second number of REs in the first set of RBs and having the first precoding.