Method and device for transmitting MCS indication information

• US 9,596,052 B2
• Filed: 07/26/2013
• Issued: 03/14/2017
• Est. Priority Date: 07/27/2012
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: Pan, Xueming, Shen, Zukang, Xu, Jing, Xiao, Guojun
• Primary Examiner(s): ROBERTS, BRIAN S
• Application Number:
  US14/417,361
• Publication Number:
  US 20150200746A1
• Time in Patent Office: 1,327 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: H04L 1/00 Arrangements for detecting or preventing errors in the information received correcting synchronisation H04L7/00
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0016 involving special memory structures, e.g. look-up tables
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• 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 2001/0092 Error control systems characterised by the topology of the transmission link
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present application relates to the field of wireless communications, and in particular, to an indication method and device for a modulation coding scheme. It is for solving the problem that in an existing LTE/LTE-A system, a higher-order modulation scheme cannot be supported, thereby limiting the further improvement of throughput in an application scenario of a high signal-to-noise ratio. The method of the embodiments of the present application includes: according to the channel quality and a first MCS table, a network side determining an MCS level corresponding to a channel scheduled for a UE; and by means of first indication information, notifying the UE of the determined MCS level, so as to indicate to the UE to determine a modulation scheme and code rate for the channel scheduled therefor according to the MCS grade, wherein there are at least corresponding entries of MCS indexes and TBS indexes corresponding to modulation schemes at higher modulation orders than 6 in the first MCS table. The embodiments of the present application introduce a higher-order modulation scheme into an existing LTE/LTE-A system, improving the spectrum efficiency.

Claims

1. A method for transmitting Modulation and Coding Scheme (MCS) indication information, wherein the method comprises:

determining, by a network side, an MCS level corresponding to a channel scheduled by the network side for a UE, according to channel quality and a first MCS table;

notifying, by the network side, the UE of the determined MCS level in first indication information to instruct the UE to determine a modulation scheme and a code rate for the channel according to the MCS level;

wherein there are at least corresponding entries of MCS indexes and Transport Block Size (TBS) indexes corresponding to modulation schemes at higher modulation orders than 6 in the first MCS table, and there is a one-to-one correspondence between MCS indexes and MCS levels;

the method further comprising;

determining, by the network side, if there is also a second MCS table which is an MCS table specified in the 3GPP LTE Rel-11 and earlier releases;

if the network side determines that there is also a second MCS table which is an MCS table specified in the 3GPP LTE Rel-11 and earlier releases, then;

instructing the UE in second indication information to use the first MCS table or the second MCS table when the UE is determining the modulation scheme and the code rate for the channel according to the notified MCS level.

2. The method according to claim 1, wherein, transmitting, by the network side, the first indication information and the second indication information via indication information items in Downlink Control Information (DCI);

or

transmitting, by the network side, the first indication information via an indication information item in the DCI and the second indication information via higher-layer signalling.

3. The method according to claim 2, wherein, transmitting, by the network side, the first indication information and the second indication information via the indication information items in the DCI comprises:

transmitting, by the network side, the first indication information and the second indication information via the indication information items in the DCI transmitted in a User Equipment-specific search space (UE-specific search space);

transmitting, by the network side, the first indication information via the indication information item in the DCI and the second indication information via the higher-layer signalling comprises;

transmitting, by the network side, the first indication information via the indication information item in the DCI transmitted in a UE-specific search space and the second indication information via the higher-layer signalling.

4. The method according to claim 2, wherein, if the network side transmits the second indication information via the higher-layer signalling and a part of entries in the second MCS table are in the first MCS table, then:

determining, by the network side, the MCS level corresponding to the channel scheduled for the UE comprises;

determining, by the network side, the MCS level corresponding to the channel scheduled for the UE according to entries in the first MCS table with same modulation orders, MCS indexes and TBS indexes as in the second MCS table.

5. The method according to claim 2, wherein if the network side transmits the second indication information via the higher-layer signalling and all of entries in the second MCS table are in the first MCS table, then the method further comprises:

determining, by the network side, the MCS level corresponding to the channel scheduled for the UE according to the second MCS table;

transmitting, by the network side, the first indication information via an indication information item in DCI transmitted in a common search space.

6. The method according to claim 1, wherein the number of entries in the first MCS table is not larger than the number of entries in the second MCS table, a part of modulation schemes in the second MCS table are in the first MCS table, and there are same TBS indexes corresponding to same modulation orders in the first MCS table as in the second MCS table.

7. The method according to claim 6, wherein, there are different MCS indexes corresponding to same TBS indexes in the first MCS table as in the second MCS table;

or

there are same MCS indexes corresponding to a part of same TBS indexes in the first MCS table as in the second MCS table.

8. The method according to claim 1, wherein the method further comprises:

notifying, by the network side, the UE of a CQI table used when a CQI is fed back, in third indication information;

wherein the CQI table comprises a first CQI table and a second CQI table, and there are at least corresponding entries of CQI indexes, code rates and spectrum efficiencies corresponding to modulation schemes at higher modulation orders than 6 in the first CQI table, and the second CQI table is a CQI table specified in the 3GPP LTE Rel-11 and earlier releases.

9. The method according to claim 8, wherein notifying, by the network side, the UE of the CQI table used when a CQI is fed back, in the third indication information comprises:

transmitting, by the network side, the third indication information via an indication information item in DCI;

or

transmitting, by the network side, the third indication information via higher-layer signalling.

10. The method according to claim 8, wherein the number of entries in the first CQI table is not larger than the number of entries in the second CQI table, a part of the modulation schemes in the second CQI table are in the first CQI table, and there are same code rates and spectrum efficiencies corresponding to same modulation schemes in the first CQI table as in the second CQI table.

11. The method according to claim 10, wherein there are different CQI indexes corresponding to same modulation schemes in the first CQI table as in the second CQI table;

or

there are same CQI indexes corresponding to a part of same modulation schemes in the first CQI table as in the second CQI table.

12. A method for receiving Modulation and Coding Scheme (MCS) indication information, wherein the method comprises:

receiving, by a UE, first indication information transmitted from a network side;

determining, by the UE, a modulation scheme and a code rate for a channel scheduled by the network side for the UE according to a first MCS table and an MCS level indicated in the first indication information;

wherein there are at least corresponding entries of MCS indexes and Transport Block Size (TBS) indexes corresponding to modulation schemes at higher modulation orders than 6 in the first MCS table, and there is a one-to-one correspondence between MCS indexes and MCS levels;

the method further comprises;

if the network side determines that there is also a second MCS table which is an MCS table specified in the 3GPP LTE Rel-11 and earlier releases,

receiving, by the UE, second indication information transmitted from the network side and determining from the second indication information the first MCS table or the second MCS table to be used.

13. The method according to claim 12, wherein the method further comprises:

receiving, by the UE, third indication information from the network side and determining from the third indication information a CQI table used for feeding back a CQI;

wherein the CQI table comprises a first CQI table and a second CQI table, and there are at least corresponding entries of CQI indexes, code rates and spectrum efficiencies corresponding to modulation schemes at higher modulation orders than 6 in the first CQI table, and the second CQI table is a CQI table specified in the 3GPP LTE Rel-11 and earlier releases.

14. A network-side device for transmitting Modulation and Coding Schemer (MCS) indication information, wherein the network-side device comprises a memory and a processor, wherein the memory is configured to store codes of a computer program and the processor is configured to execute the computer program to:

determine an MCS level corresponding to a channel scheduled by the network-side device for a UE according to channel quality and a first MCS table;

notify the UE of the determined MCS level in first indication information to instruct the UE to determine a modulation scheme and a code rate for the channel according to the MCS level;

wherein there are at least corresponding entries of MCS indexes and Transport Block Size (TBS) indexes corresponding to modulation schemes at higher modulation orders than 6 in the first MCS table, and there is a one-to-one correspondence between MCS indexes and MCS levels;

the processor is further configured to;

determine if there is also a second MCS table which is an MCS table specified in the 3GPP LTE Rel-11 and earlier releases;

if it is determined that there is also a second MCS table which is an MCS table specified in the 3GPP LTE Rel-11 and earlier releases, then;

instruct the UE in second indication information to use the first MCS table or the second MCS table when the UE is determining the modulation scheme and the code rate for the channel according to the notified MCS level.

15. A User Equipment (UE) for receiving MCS indication information, wherein the UE comprises a memory and a processor, wherein the memory is configured to store codes of a computer program and the processor is configured to execute the computer program to:

receive first indication information transmitted from a network-side device;

determine a modulation scheme and a code rate for a channel scheduled by the network-side device for the UE according to a first MCS table and an MCS level indicated in the first indication information;

wherein there are at least corresponding entries of MCS indexes and Transport Block Size (TBS) indexes corresponding to modulation schemes at higher modulation orders than 6 in the first MCS table, and there is a one-to-one correspondence between MCS indexes and MCS levels;

the processor is further configured to;

if the network side determines that there is also a second MCS table which is an MCS table specified in the 3GPP LTE Rel-11 and earlier releases,

receive second indication information transmitted from the network side and determine from the second indication information the first MCS table or the second MCS table to be used.

16. The UE according to claim 15, wherein the processor is configured to receive first indication information transmitted from a network-side device and is further configured to:

in response to determining that there is also a second MCS table, receive second indication information transmitted from the network-side device and determine from the second indication information the first MCS table or the second MCS table to be used;

wherein the second MCS table is an MCS table specified in the 3GPP LTE Rel-11 and earlier releases.

17. The UE according to claim 15, wherein the processor is configured to receive first indication information transmitted from a network-side device is further configured to:

receive third indication information from the network-side device and determine from the third indication information a CQI table used for feeding back a CQI;

wherein the CQI table comprises a first CQI table and a second CQI table, and there are at least corresponding entries of CQI indexes, code rates and spectrum efficiencies corresponding to modulation schemes at higher modulation orders than 6 in the first CQI table, and the second CQI table is a CQI table specified in the 3GPP LTE Rel-11 and earlier releases.