METHOD AND APPARATUS FOR DETERMINING MODULATION AND CODING SCHEME

• US 20200136747A1
• Filed: 04/24/2017
• Published: 04/30/2020
• Est. Priority Date: 04/24/2017
• Status: Active Grant

• Current Assignee: Beijing Xiaomi Mobile Software Co., Ltd. (Xiaomi Corp.)
• Original Assignee: Beijing Xiaomi Mobile Software Co., Ltd. (Xiaomi Corp.)
• Inventors: ZHOU, Juejia, ZHU, Yajun, ZHANG, Ming
• Granted Patent: US 10,999,002 B2
• Time in Patent Office: Days
• 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 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0033 arrangements specific to the transmitter
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/3411 reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
• CPC Class Codes: H04L 27/3477 by using the outer points of the constellation or of the constituent two-dimensional constellations
• CPC Class Codes: H04L 27/3488 Multiresolution systems
• CPC Class Codes: H04L 27/362 Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated H04L27/366 takes precedence
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• 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: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

A method of determining a modulation and coding scheme includes: acquiring UCI transmitted by UE, the UCI including at least a CQI index; determining whether the CQI index belongs to a CQI compression index representing at least two modulation and coding schemes; when the CQI index belongs to the CQI compression index, determining a modulation and coding scheme represented by the CQI compression index according to preset CQI compression index indication information; and determining modulation and coding configuration information for the UE according to the modulation and coding scheme, and transmitting the modulation and coding configuration information to the UE. By adopting the method of determining the modulation and coding scheme, a higher-order modulation and coding scheme may be configured for the UE based on a relevant CQI index to reduce calculation amount during analyzing the modulation and coding scheme.

Claims

1. A method of determining a modulation and coding scheme, applied to a base station, and comprising:

acquiring uplink control information (UCI) transmitted by user equipment (UE), wherein the UCI comprises at least a channel quality indication (CQI) index;

determining whether the CQI index belongs to a CQI compression index representing at least two modulation and coding schemes;

when the CQI index belongs to the CQI compression index, determining a modulation and coding scheme represented by the CQI compression index according to preset CQI compression index indication information; and

determining modulation and coding configuration information for the UE according to the modulation and coding scheme, and transmitting the modulation and coding configuration information to the UE;

wherein the preset CQI compression index indication information comprises;

a correspondence between the CQI compression index and the at least two modulation and coding schemes, and a CQI compression index representation manner corresponding to each modulation and coding scheme.

2. The method according to claim 1, wherein prior to the acquiring the UCI transmitted by the UE, the method further comprises:

transmitting CQI compression index configuration information to the UE,

wherein the CQI compression index configuration information comprises;

the CQI compression index, the at least two modulation and coding schemes represented by each CQI compression index, and the CQI compression index representation manner corresponding to each modulation and coding scheme.

3. The method according to claim 1, wherein

the UCI further comprises:

an equipment identifier of the UE, and

the determining whether the CQI index belongs to the CQI compression index representing the at least two modulation and coding schemes comprises;

determining whether the UE supports a CQI index compression function according to the equipment identifier of the UE; and

when the UE supports the CQI index compression function, determining whether the CQI index belongs to the CQI compression index according to the preset CQI compression index indication information.

4. The method according to claim 1, wherein whether the CQI index belongs to the CQI compression index is determined in at least one of:

when the UCI received comprises preset compression indication information, determining that the CQI index in the UCI belongs to the CQI compression index;

when the UCI comprises preset scrambled information, determining that the CQI index in the UCI belongs to the CQI compression index;

or

when the UCI is received by using preset uplink time-frequency resources, determining that the CQI index in the UCI belongs to the CQI compression index.

5. The method according to claim 4, wherein the determining the modulation and coding scheme represented by the CQI compression index according to the preset CQI compression index indication information comprises:

determining the modulation and coding scheme represented by the CQI compression index according to a value of the compression indication information.

6. The method according to claim 4, wherein the determining the modulation and coding scheme represented by the CQI compression index according to the preset CQI compression index indication information comprises:

descrambling the scrambled information in the UCI according to a preset scrambling code to determine a target scrambling code and the CQI compression index; and

determining the modulation and coding scheme represented by the CQI compression index according to the target scrambling code.

7. The method according to claim 4, wherein the determining the modulation and coding scheme represented by the CQI compression index according to the preset CQI compression index indication information comprises:

determining a target time-frequency resource location for acquiring the UCI;

determining the modulation and coding scheme represented by the CQI compression index according to the target time-frequency resource location; and

allocating higher-order modulation and coding scheme including 1024 Quadrature Amplitude Modulation (QAM) and 2048 QAM for the UE, thereby improving data transmission throughput of a channel without adding a new CQI index or increasing computation amount.

8. A method of determining a modulation and coding scheme, applied to a user equipment (UE), and comprising:

determining a to-be-requested modulation and coding scheme according to measured downlink channel quality;

querying a preset channel quality indication (CQI) table according to the to-be-requested modulation and coding scheme to determine a target CQI index; and

when the target CQI index belongs to a CQI compression index representing at least two modulation and coding schemes, transmitting the CQI compression index to a base station with preset CQI compression index indication information, so that the base station configures a modulation and coding scheme for the UE according to the CQI compression index.

9. The method according to claim 8, wherein the CQI compression index is transmitted to the base station with the preset CQI compression index indication information in at least one of:

setting a value of a reserved bit in uplink control information (UCI) to a value corresponding to the to-be-requested modulation and coding scheme, and transmitting the value to the base station;

using a scrambling code corresponding to the to-be-requested modulation and coding scheme to scramble the UCI, and transmitting the scrambled UCI to the base station;

or

using a target uplink time-frequency resource specified for the to-be-requested modulation and coding scheme to transmit the UCI to the base station;

wherein the UCI comprises the CQI compression index.

10. The method according to claim 8, further comprising:

acquiring CQI compression index configuration information including;

the CQI compression index, the at least two modulation and coding schemes represented by each CQI compression index, and a CQI compression index representation manner corresponding to each modulation and coding scheme.

11-22. -22. (canceled)

23. An apparatus for determining a modulation and coding scheme, comprising:

a processor; and

a memory storing instructions for execution by the processor;

wherein the processor is configured to;

acquire uplink control information (UCI) transmitted by user equipment (UE), wherein the UCI comprises at least a channel quality indication (CQI) index;

determine whether the CQI index belongs to a CQI compression index representing at least two modulation and coding schemes;

when the CQI index belongs to the CQI compression index, determine a modulation and coding scheme represented by the CQI compression index according to preset CQI compression index indication information; and

determine modulation and coding configuration information for the UE according to the modulation and coding scheme, and transmit the modulation and coding configuration information to the UE;

wherein the preset CQI compression index indication information comprises;

a correspondence between the CQI compression index and the at least two modulation and coding schemes, and a CQI compression index representation manner corresponding to each modulation and coding scheme.

25. The apparatus according to claim 23, wherein prior to the acquiring the UCI transmitted by the UE, the method further comprises:

transmitting CQI compression index configuration information to the UE,

wherein the CQI compression index configuration information comprises;

the CQI compression index, the at least two modulation and coding schemes represented by each CQI compression index, and the CQI compression index representation manner corresponding to each modulation and coding scheme.

26. The apparatus according to claim 23, wherein

the UCI further comprises:

an equipment identifier of the UE, and

determining whether the CQI index belongs to the CQI compression index representing the at least two modulation and coding schemes comprises;

determining whether the UE supports a CQI index compression function according to the equipment identifier of the UE; and

when the UE supports the CQI index compression function, determining whether the CQI index belongs to the CQI compression index according to the preset CQI compression index indication information.

27. The apparatus according to claim 23, wherein whether the CQI index belongs to the CQI compression index is determined in at least one of:

when the UCI received comprises preset compression indication information, determining that the CQI index in the UCI belongs to the CQI compression index;

when the UCI comprises preset scrambled information, determining that the CQI index in the UCI belongs to the CQI compression index;

or

when the UCI is received by using preset uplink time-frequency resources, determining that the CQI index in the UCI belongs to the CQI compression index.

28. The apparatus according to claim 27, wherein the determining the modulation and coding scheme represented by the CQI compression index according to the preset CQI compression index indication information comprises:

determining the modulation and coding scheme represented by the CQI compression index according to a value of the compression indication information.

29. The apparatus according to claim 27, wherein the determining the modulation and coding scheme represented by the CQI compression index according to the preset CQI compression index indication information comprises:

descrambling the scrambled information in the UCI according to a preset scrambling code to determine a target scrambling code and the CQI compression index; and

determining the modulation and coding scheme represented by the CQI compression index according to the target scrambling code.

30. The apparatus according to claim 23, wherein the determining the modulation and coding scheme represented by the CQI compression index according to the preset CQI compression index indication information comprises:

determining a target time-frequency resource location for acquiring the UCI; and

determining the modulation and coding scheme represented by the CQI compression index according to the target time-frequency resource location.

24. (canceled)

31. An apparatus for determining a modulation and coding scheme, comprising:

a processor; and

a memory storing instructions for execution by the processor;

wherein the processor is configured to;

determine a to-be-requested modulation and coding scheme according to measured downlink channel quality;

query a preset CQI table according to the to-be-requested modulation and coding scheme to determine a target CQI index; and

when the target CQI index belongs to a CQI compression index representing at least two modulation and coding schemes, transmit the CQI compression index to a base station with preset CQI compression index indication information, so that the base station configures a modulation and coding scheme for the UE according to the CQI compression index.

32. The apparatus according to claim 31, wherein the CQI compression index is transmitted to the base station with the preset CQI compression index indication information in at least one of:

setting a value of a reserved bit in UCI to a value corresponding to the to-be-requested modulation and coding scheme, and transmitting the value to the base station;

using a scrambling code corresponding to the to-be-requested modulation and coding scheme to scramble the UCI, and transmitting the scrambled UCI to the base station;

or

using a target uplink time-frequency resource specified for the to-be-requested modulation and coding scheme to transmit the UCI to the base station;

wherein the UCI comprises the CQI compression index.

33. The apparatus according to claim 31, wherein the processor is further configured to:

acquire CQI compression index configuration information, wherein the CQI compression index configuration information comprises;

the CQI compression index, the at least two modulation and coding schemes represented by each CQI compression index, and a CQI compression index representation manner corresponding to each modulation and coding scheme.