Techniques of CSI feedback with unequal error protection messages

• US 10,469,204 B2
• Filed: 01/09/2018
• Issued: 11/05/2019
• Est. Priority Date: 01/09/2017
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Tsai, Lung-Sheng, Yang, Weidong
• Primary Examiner(s): Chery, Dady
• Application Number:
  US15/865,457
• Publication Number:
  US 20180198561A1
• Time in Patent Office: 665 Days
• CPC Class Codes: H03M 13/13 Linear codes
• CPC Class Codes: H03M 13/136 Reed-Muller [RM] codes
• CPC Class Codes: H03M 13/356 Unequal error protection [UEP]
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0478 Special codebook structures directed to feedback optimisation
• CPC Class Codes: H04B 7/0479 for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0652 Feedback error handling
• CPC Class Codes: H04L 1/0013 Rate matching, e.g. puncturing or repetition of code symbols
• CPC Class Codes: H04L 1/007 Unequal error protection for format H04L1/0078; for codes per se H03M13/35
• CPC Class Codes: H04L 1/0073 Special arrangements for feedback channel
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 27/3488 Multiresolution systems
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The apparatus may be a UE. The UE determines a plurality of messages containing channel state information to be reported to a base station. The UE also determines a priority level for each of the plurality of messages based on at least one predetermined rule. The UE further selects one or more messages from the plurality of messages based on priority levels of the plurality of messages. The UE then sends the selected one or more messages to the base station.

Claims

1. A method of wireless communication of a user equipment (UE), comprising:

determining a plurality of messages containing channel state information to be reported to a base station;

determining a priority level for each of the plurality of messages based on at least one predetermined rule;

selecting one or more messages from the plurality of messages based on priority levels of the plurality of messages; and

sending the selected one or more messages to the base station;

wherein the at least one predetermined rule specifies that a message including an indicator indicating at least one of a beam selection at a particular dimension and an orthogonal beam group selection has a priority level higher than a priority level of a message including an indicator indicating at least one of a beam direction from a group of beam candidates or co-phasing between two sets of antennas for two polarizations.

2. The method of claim 1, wherein the channel state information contains wide-band channel state information and sub-band channel state information.

3. The method of claim 1, wherein the channel state information contains at least one of a channel quality indicator, a rank indication, and a precoding matrix indicator.

4. The method of claim 1, wherein the at least one predetermined rule specifies that a message including a wide-band component of the channel state information has a priority level higher than a priority level of a message including a sub-band component of the channel state information.

5. The method of claim 1, wherein the at least one predetermined rule specifies that a message including a rank indication has a priority level higher than a priority level of a message including a channel quality indicator.

6. The method of claim 1, wherein the at least one predetermined rule specifies that a message including a rank indication has a priority level higher than a priority level of a message including a precoding matrix indicator.

7. The method of claim 1, wherein the at least one predetermined rule specifies that a message including a precoding matrix indicator has a priority level higher than a priority level of a message including a channel quality indicator.

8. A method of wireless communication of a user equipment (UE), comprising:

determining a plurality of messages containing channel state information to be reported to a base station;

determining a priority level for each of the plurality of messages based on at least one predetermined rule;

selecting one or more messages from the plurality of messages based on priority levels of the plurality of messages; and

sending the selected one or more messages to the base station;

wherein the at least one predetermined rule specifies that a message including an indicator indicating a number of beams for a linear combination has a priority level higher than a priority level of a message including an indicator indicating an index for a strongest coefficient per layer.

9. A method of wireless communication of a user equipment (UE), comprising:

determining a plurality of messages containing channel state information to be reported to a base station;

determining a priority level for each of the plurality of messages based on at least one predetermined rule;

selecting one or more messages from the plurality of messages based on priority levels of the plurality of messages; and

sending the selected one or more messages to the base station;

wherein the at least one predetermined rule specifies that a priority level of a message including an indicator indicating an index for a strongest coefficient per layer has a priority level higher than a priority level of a message including an indicator indicating a wide-band amplitude.

10. A method of wireless communication of a user equipment (UE), comprising:

determining a plurality of messages containing channel state information to be reported to a base station;

determining a priority level for each of the plurality of messages based on at least one predetermined rule;

selecting one or more messages from the plurality of messages based on priority levels of the plurality of messages; and

sending the selected one or more messages to the base station;

wherein the at least one predetermined rule specifies that, for reporting a plurality of bits representing amplitudes, priority levels of messages carrying the plurality of bits descend from a message carrying a most significant bit of the plurality of bits to a message carrying a least significant bit of the plurality of bits.

11. A method of wireless communication of a user equipment (UE), comprising:

determining a plurality of messages containing channel state information to be reported to a base station;

determining a priority level for each of the plurality of messages based on at least one predetermined rule;

selecting one or more messages from the plurality of messages based on priority levels of the plurality of messages; and

sending the selected one or more messages to the base station;

wherein the at least one predetermined rule specifies that, for reporting channel state information of a plurality of sub-band channels, all messages carrying channel state information of odd indexed sub-band channels of the plurality of sub-band channels have priority levels higher or lower than priority levels of all messages carrying channel state information of even indexed sub-band channels of the plurality of sub-band channels.

12. A method of wireless communication of a user equipment (UE), comprising:

determining a plurality of messages containing channel state information to be reported to a base station;

determining a priority level for each of the plurality of messages based on at least one predetermined rule;

selecting one or more messages from the plurality of messages based on priority levels of the plurality of messages; and

sending the selected one or more messages to the base station;

wherein the at least one predetermined rule specifies that, for reporting a plurality of sub-band amplitudes, all messages carrying odd indexed sub-band amplitudes of the plurality of sub-band amplitudes have priority levels higher or lower than priority levels of all messages carrying even indexed sub-band amplitude of the plurality of sub-band amplitudes.

13. A method of wireless communication of a user equipment (UE), comprising:

determining a plurality of messages containing channel state information to be reported to a base station;

determining a priority level for each of the plurality of messages based on at least one predetermined rule;

selecting one or more messages from the plurality of messages based on priority levels of the plurality of messages; and

sending the selected one or more messages to the base station;

wherein the at least one predetermined rule specifies that, for reporting a plurality of sub-band phases, messages carrying sub-band phases of the plurality of sub-band phases associated with a number of strongest coefficients have priority levels higher than priority levels of messages carrying the remaining sub-band phases of the plurality of sub-band phases.

14. A method of wireless communication of a user equipment (UE), comprising:

determining a first message and a second message containing channel state information to be reported to a base station;

determining that a priority level of the first message is higher than a priority level of the second message based on at least one predetermined rule; and

mapping information bits of the first message to a first plurality of input bits of an encoder and information bits of the second message to a second plurality of input bits of the encoder, the first plurality of input bits offering an error protection level higher than an error protection level offered by the second plurality of input bits;

wherein, when the encoder is the Polar-code encoder, reliabilities of the first plurality of input bits are higher than reliabilities of the second plurality of input bits, and a reliability of each input bit of the first plurality of input bits and the second plurality of input bits is defined by a correct rate or a log likelihood ratio (LLR) of that input bit.

15. The method of claim 14, further comprising:

encoding, at the encoder, the first plurality of input bits and the second plurality of input bits to generate encoded bits; and

transmitting the encoded bits to the base station.

16. The method of claim 14, wherein the channel state information contains wide-band channel state information and sub-band channel state information.

17. The method of claim 14, wherein the channel state information contains at least one of a channel quality indicator, a rank indication, and a precoding matrix indicator.

18. The method of claim 14, wherein the at least one predetermined rule specifies that a message including a wide-band component of the channel state information has a priority level higher than a priority level of a message including a sub-band component of the channel state information.

19. The method of claim 14, wherein the at least one predetermined rule specifies that a message including a rank indication has a priority level higher than a priority level of a message including a channel quality indicator.

20. The method of claim 14, wherein the at least one predetermined rule specifies that a message including a rank indication has a priority level higher than a priority level of a message including a precoding matrix indicator, wherein the at least one predetermined rule further specifies that a message including a precoding matrix indicator has a priority level higher than a priority level of a message including a channel quality indicator.

21. The method of claim 14, wherein the at least one predetermined rule specifies that a message including a precoding matrix indicator has a priority level higher than a priority level of a message including a channel quality indicator.

22. The method of claim 14, wherein the at least one predetermined rule specifies that a message including an indicator indicating at least one of a beam selection at a particular dimension and an orthogonal beam group selection has a priority level higher than a priority level of a message including an indicator indicating at least one of a beam direction from a group of beam candidates or co-phasing between two sets of antennas for two polarizations.

23. The method of claim 14, wherein the at least one predetermined rule specifies that a message including an indicator indicating a number of beams for a linear combination has a priority level higher than a priority level of a message including an indicator indicating an index for a strongest coefficient per layer.

24. The method of claim 14, wherein the at least one predetermined rule specifies that a priority level of a message including an indicator indicating an index for a strongest coefficient per layer has a priority level higher than a priority level of a message including an indicator indicating a wide-band amplitude.

25. The method of claim 14, wherein the at least one predetermined rule specifies that, for reporting a plurality of bits representing amplitudes, priority levels of messages carrying the plurality of bits descend from a message carrying a most significant bit of the plurality of bits to a message carrying a least significant bit of the plurality of bits.

26. The method of claim 14, wherein the at least one predetermined rule specifies that, for reporting channel state information of a plurality of sub-band channels, all messages carrying channel state information of odd indexed sub-band channels of the plurality of sub-band channels have priority levels higher or lower than priority levels of all messages carrying channel state information of even indexed sub-band channels of the plurality of sub-band channels.

27. The method of claim 14, wherein the at least one predetermined rule specifies that, for reporting a plurality of sub-band amplitudes, all messages carrying odd indexed sub-band amplitudes of the plurality of sub-band amplitudes have priority levels higher or lower than priority levels of all messages carrying even indexed sub-band amplitude of the plurality of sub-band amplitudes.

28. The method of claim 14, wherein the at least one predetermined rule specifies that, for reporting a plurality of sub-band phases, messages carrying sub-band phases of the plurality of sub-band phases associated with a number of strongest coefficients have priority levels higher than priority levels of messages carrying the remaining sub-band phases of the plurality of sub-band phases.

29. A method of wireless communication of a user equipment (UE), comprising:

determining a first message and a second message containing channel state information to be reported to a base station;

determining that a priority level of the first message is higher than a priority level of the second message based on at least one predetermined rule; and

mapping information bits of the first message to a first plurality of input bits of an encoder and information bits of the second message to a second plurality of input bits of the encoder, the first plurality of input bits offering an error protection level higher than an error protection level offered by the second plurality of input bits;

wherein, when the encoder is the Reed-Muller encoder, the first plurality of input bits are carried by a first set of basis vectors, the second plurality of input bits are carried by a second set of basis vectors, and a minimum Euclidean distance of any basis vector in the first set of basis vectors with respect to the other basis vectors in the first set of basis vectors is greater than or equal to a minimum Euclidean distance of any basis vector in the second set of basis vectors with respect to the other basis vectors in the second set of basis vectors.

30. A method of wireless communication of a user equipment (UE), comprising:

determining a first message and a second message containing channel state information to be reported to a base station;

determining that a priority level of the first message is higher than a priority level of the second message based on at least one predetermined rule; and

mapping information bits of the first message to a first plurality of input bits of an encoder and information bits of the second message to a second plurality of input bits of the encoder, the first plurality of input bits offering an error protection level higher than an error protection level offered by the second plurality of input bits;

wherein, when the encoder is the super-position coding encoder, the first plurality of input bits are a predetermined number of most significant bits of one or more symbols, and the second plurality of input bits are among the other bits of the one or more symbols.

31. A method of wireless communication of a user equipment (UE), comprising:

determining a first message and a second message containing channel state information to be reported to a base station;

determining that a priority level of the first message is higher than a priority level of the second message based on at least one predetermined rule;

mapping information bits of the first message to a first plurality of input bits of an encoder and information bits of the second message to a second plurality of input bits of the encoder, the first plurality of input bits offering an error protection level higher than an error protection level offered by the second plurality of input bits

encoding, at the encoder, the first plurality of input bits and the second plurality of input bits to generate encoded bits; and

transmitting the encoded bits to the base station;

wherein the method further comprises;

generating data bits representing the channel state information, wherein the information bits of the first message include a first group of data bits of the generated data bits and protection bits derived from the first group of data bits, wherein the information bits of the second message include a second group of data bits of the generated data bits.

32. The method of claim 31, wherein the protection bits are a cyclic redundancy check computed based on the first group of data bits or a channel code computed based on the first group of data bits.