METHOD AND BS FOR TRANSMITTING CONTROL INFORMATION TO UE, AND METHOD AND UE FOR HANDLING CONTROL INFORMATION

• US 20160128032A1
• Filed: 06/27/2013
• Published: 05/05/2016
• Est. Priority Date: 06/27/2013
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Wang, Jun, Liu, Guidong, Liu, Yingde
• Granted Patent: US 9,955,467 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 1/0038 Blind format detection for detection of modulation format H04L27/0012
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 74/02 Hybrid access

Abstract

The present disclosure relates to a method used in a BS for transmitting control information to a UE, and an associated BS. The method includes: generating a first indication indicating whether data, which are downlink data transmitted from the BS to the UE or uplink data transmitted from the UE to the BS, are in an initial transmission or a retransmission, the first indication being comprised in the control information; if the data are in the initial transmission, generating a second indication for determining modulation mode and Transport Block, TB, size of the data, the second indication being comprised in the control information; and transmitting the control information to the UE.

Claims

1. A method used in a Base Station, BS, for transmitting control information to a User Equipment, UE, the method comprising:

generating a first indication indicating whether data, which are downlink data transmitted from the BS to the UE or uplink data transmitted from the UE to the BS, are in an initial transmission or a retransmission, the first indication being comprised in the control information;

if the data are in the initial transmission,

generating a second indication for determining modulation mode and Transport Block, TB, size of the data, the second indication being comprised in the control information; and

transmitting the control information to the UE.

2. The method according to claim 1, further comprising:

if the data are in the retransmission,

generating a third indication indicating modulation mode and redundancy version for the retransmission of the data, the third indication being comprised in the control information; and

transmitting the control information to the UE.

3. The method according to claim 2, wherein if the data are downlink data, the method further comprises:

if the downlink data are in the retransmission,

determining a first Walsh code for the UE transmitting Hybrid Automatic Repeat Request, HARQ, feedback based on a Control Channel Element, CCE, index allocated to the UE;

determining a second Walsh code, which is used for the UE transmitting HARQ feedback the downlink data when the UE requests the BS to retransmit the initial transmission of the downlink data, from one or more available Walsh codes other than the first Walsh code within the same Physical Resource Block, PRB, as that of the first Walsh code;

generating a fourth indication indicating the second Walsh code, the fourth indication being comprised in the control information;

receiving HARQ feedback of the downlink data from the UE; and

identifying that the UE requests retransmission of the initial transmission of the downlink data if the HARQ feedback uses the second Walsh code.

4. The method according to claim 2, wherein if the data are uplink data, the method further comprises:

if the uplink data are in the retransmission,

determining first two scrambling sequences for the UE masking Hybrid Automatic Repeat Request, HARQ, feedback of previous downlink data within a bundling window based on a total number of downlink transmissions within the bundling window;

determining a third scrambling sequence, which is used for the UE masking HARQ feedback of the previous downlink data when the UE requests the BS to retransmit an initial transmission of the previous downlink data, from available scrambling sequences other than the first two scrambling sequences;

generating a fifth indication indicating the third scrambling sequence, the fifth indication being comprised in the control information;

receiving HARQ feedback from the UE; and

identifying that the UE requests retransmission of the initial transmission of the previous downlink data if the HARQ feedback is masked with the third scrambling sequence.

5. The method according to claim 2,

wherein the control information is transmitted via Downlink Control Information, DCI,

wherein if the data are in the initial transmission,

the first indication is of one bit, and the second indication is of five bits;

and

wherein if the data are in the retransmission,

the first indication is of one bit, and the third indication is of three bits.

6. A method used in a User Equipment, UE, for handling control information from a Base Station, BS, the method comprising:

receiving the control information from the BS;

determining whether data, which are downlink data transmitted from the BS to the UE or uplink data transmitted from the UE to the BS, are in an initial transmission or a retransmission based on a first indication comprised in the control information;

if the data are in the initial transmission,

determining modulation mode and Transport Block, TB, size of the data based on a second indication comprised in the control information.

7. The method according to claim 6, further comprising:

if the data are in the retransmission,

determining modulation mode and redundancy version for the retransmission of the data based on a third indication comprised in the control information.

8. The method according to claim 7, if the data are downlink data, the method further comprises:

if the downlink data are in the retransmission,

determining a first Walsh code for transmitting Hybrid Automatic Repeat Request, HARQ, feedback based on a Control Channel Element, CCE, index allocated to the UE;

determining a second Walsh code, which is used for the UE transmitting HARQ feedback of the downlink data when the UE requests the BS to retransmit the initial transmission of the downlink data, based on a fourth indication comprised in the control information, the second Walsh code being selected from one or more available Walsh codes other than the first Walsh code within the same Physical Resource Block, PRB, as that of the first Walsh code; and

transmitting HARQ feedback of the downlink data to the BS using the second Walsh code to indicate that the UE requests retransmission of the initial transmission of the downlink data.

9. The method according to claim 7, wherein if the data are uplink data, the method further comprises:

if the uplink data are in the retransmission,

determining first two scrambling sequences for the UE masking Hybrid Automatic Repeat Request, HARQ, feedback of previous downlink data within a bundling window based on a total number of downlink transmissions within the bundling window;

determining a third scrambling sequence, which is used for the UE masking HARQ feedback of the previous downlink data when the UE requests the BS to retransmit an initial transmission of the previous downlink data, based on a fifth indication comprised in the control information, the third scrambling sequence being selected from available scrambling sequences other than the first two scrambling sequences; and

transmitting the HARQ feedback to the BS to indicate that the UE requests retransmission of the initial transmission of the previous downlink data if the HARQ feedback is masked with the third scrambling sequence.

10. The method according to claim 7,

wherein the control information is received via Downlink Control Information, DCI,

wherein if the data are in the initial transmission,

the first indication is of one bit, and the second indication is of five bits;

and

wherein if the data are in the retransmission,

the first indication is of one bit, and the third indication is of three bits.

11. A method used in a Base Station, BS, for identifying that a User Equipment, UE, requests the BS to retransmit an initial transmission of downlink data, comprising:

determining a first position, which is used for the UE transmitting Hybrid Automatic Repeat Request, HARQ, feedback when the UE does not request the BS to retransmit the initial transmission of the downlink data;

determining a second position, which is used for the UE transmitting HARQ feedback of the downlink data when the UE requests the BS to retransmit the initial transmission of the downlink data, the second position being different from the first position;

transmitting to the UE an indication indicating the second position;

receiving HARQ feedback of the downlink data from the UE; and

identifying that the UE requests retransmission of the initial transmission of the downlink data if the HARQ feedback uses the second position.

12. The method according to claim 11, wherein

the first position is indicated by a first Walsh code, which is determined based on a Control Channel Element, CCE, index allocated to the UE, and

the second position is indicated by a second Walsh code, which is determined from one or more available Walsh codes other than the first Walsh code within the same Physical Resource Block, PRB, as that of the first Walsh code.

13. The method according to claim 11, wherein

the first position is indicated by first two scrambling sequences, which are determined based on a total number of downlink transmissions within a bundling window, and

the second position is indicated by a third scrambling sequence, which is determined from available scrambling sequences other than the first two scrambling sequences.

14. A method used in User Equipment, UE, for requesting a Base Station, BS, to retransmit an initial transmission of downlink data, comprising:

determining a first position, which is used for the UE transmitting Hybrid Automatic Repeat Request, HARQ, feedback when the UE does not request the BS to retransmit the initial transmission of the downlink data;

receiving from the BS an indication indicating a second position, which is used for the UE transmitting HARQ feedback of the downlink data when the UE requests the BS to retransmit the initial transmission of the downlink data, the second position being different from the first position; and

transmitting HARQ feedback of the downlink data to the BS using the second position to indicate that the UE requests retransmission of the initial transmission of the downlink data.

15. The method according to claim 14,

wherein the first position is indicated by a first Walsh code, which is determined based on a Control Channel Element, CCE, index allocated to the UE, and

wherein the second position is indicated by a second Walsh code, which is determined from one or more available Walsh codes other than the first Walsh code within the same Physical Resource Block, PRB, as that of the first Walsh code.

16. The method according to claim 14,

wherein the first position is indicated by first two scrambling sequences, which are determined based on a total number of downlink transmissions within a bundling window, and

wherein the second position is indicated by a third scrambling sequence, which is determined from available scrambling sequences other than the first two scrambling sequences.

17. A Base Station, BS, for transmitting control information to a User Equipment, UE, the BS comprising a generating unit and a transmitting unit,

wherein the generating unit is configured to generate a first indication indicating whether data, which are downlink data transmitted from the BS to the UE or uplink data transmitted from the UE to the BS, are in an initial transmission or a retransmission, the first indication being comprised in the control information,

wherein if the data are in the initial transmission,

the generating unit is further configured to generate a second indication for determining modulation mode and Transport Block, TB, size of the data, the second indication being comprised in the control information, and the transmitting unit is configured to transmit the control information to the UE.

18. The BS according to claim 17, wherein:

if the data are in the retransmission,

the generating unit is further configured to generate a third indication indicating modulation mode and redundancy version for the retransmission of the data, the third indication being comprised in the control information, and the transmitting unit is configured to transmit the control information to the UE.

19. The BS according to claim 18, further comprising a first determining unit, a first receiving unit, and a first identifying unit,

wherein if the data are downlink data and the downlink data are in the retransmission,

the first determining unit is configured to determine a first Walsh code for the UE transmitting Hybrid Automatic Repeat Request, HARQ, feedback based on a Control Channel Element, CCE, index allocated to the UE;

the first determining unit is further configured to determine a second Walsh code, which is used for the UE transmitting HARQ feedback of the downlink data when the UE requests the BS to retransmit the initial transmission of the downlink data, from one or more available Walsh codes other than the first Walsh code within the same Physical Resource Block, PRB, as that of the first Walsh code;

the generating unit is further configured to generate a fourth indication indicating the second Walsh code, the fourth indication being comprised in the control information;

the first receiving unit is configured to receive HARQ feedback of the downlink data from the UE; and

the first identifying unit is configured to identify that the UE requests retransmission of the initial transmission of the downlink data if the HARQ feedback uses the second Walsh code.

20. The BS according to claim 18, further comprising a second determining unit, a second receiving unit, and a second identifying unit,

wherein if the data are uplink data, and the uplink data are in the retransmission:

the second determining unit is configured to determine first two scrambling sequences for the UE masking Hybrid Automatic Repeat Request, HARQ, feedback of previous downlink data within a bundling window based on a total number of downlink transmissions within the bundling window;

the second determining unit is further configured to determine a third scrambling sequence, which is used for the UE masking HARQ feedback of the previous downlink data when the UE requests the BS to retransmit an initial transmission of the previous downlink data, from available scrambling sequences other than the first two scrambling sequences;

the generating unit is further configured to generate a fifth indication indicating the third scrambling sequence, the fifth indication being comprised in the control information;

the second receiving unit is configured to receive HARQ feedback of the previous downlink data from the UE; and

the second identifying unit is configured to identify that the UE requests retransmission of the initial transmission of the previous downlink data if the HARQ feedback is masked with the third scrambling sequence.

21. The BS according to claim 18,

wherein the transmitting unit is further configured to transmit the control information via Downlink Control Information, DCI,

wherein if the data are in the initial transmission,

the first indication is of one bit, and the second indication is of five bits;

and

wherein if the data are in the retransmission,

the first indication is of one bit, and the third indication is of three bits.

22. A User Equipment, UE, for handling control information from a Base Station, BS, the UE comprising a receiving unit and a determining unit, wherein

the receiving unit is configured to receive the control information from the BS;

the determining unit is configured to determine whether data, which are downlink data transmitted from the BS to the UE or uplink data transmitted from the UE to the BS, are in an initial transmission or a retransmission based on a first indication comprised in the control information;

if the data are in the initial transmission,

the determining unit is further configured to determine modulation mode and Transport Block, TB, size of the data based on a second indication comprised in the control information.

23. The UE according to claim 22,

wherein if the data are in the retransmission,

the determining unit is further configured to determine modulation mode and redundancy version for the retransmission of the data based on a third indication comprised in the control information.

24. The UE according to claim 23, further comprising a first transmitting unit,

wherein if the data are downlink data and in the retransmission,

the determining unit is further configured to determine a first Walsh code for transmitting Hybrid Automatic Repeat Request, HARQ, feedback based on a Control Channel Element, CCE, index allocated to the UE;

the determining unit is further configured to determine a second Walsh code, which is used for the UE transmitting HARQ feedback of the downlink data when the UE requests the BS to retransmit the initial transmission of the downlink data, based on a fourth indication comprised in the control information, the second Walsh code being selected from one or more available Walsh codes other than the first Walsh code within the same Physical Resource Block, PRB, as that of the first Walsh code; and

the first transmitting unit is configured to transmit HARQ feedback of the downlink data to the BS using the second Walsh code to indicate that the UE requests retransmission of the initial transmission of the downlink data.

25. The UE according to claim 23, further comprising a second transmitting unit,

wherein if the data are uplink data and in the retransmission,

the determining unit is further configured to determine first two scrambling sequences for the UE masking Hybrid Automatic Repeat Request, HARQ, feedback of previous downlink data within a bundling window based on a total number of downlink transmissions within the bundling window;

the determining unit is further configured to determine a third scrambling sequence, which is used for the UE masking HARQ feedback of the previous downlink data when the UE requests the BS to retransmit an initial transmission of the previous downlink data, based on a fifth indication comprised in the control information, the third scrambling sequence being selected from available scrambling sequences other than the first two scrambling sequences; and

the second transmitting unit is configured to transmit the HARQ feedback to the BS to indicate that the UE requests retransmission of the initial transmission of the previous downlink data if the HARQ feedback is masked with the third scrambling sequence.

26. The UE according to claim 23,

wherein the receiving unit is further configured to receive the control information via Downlink Control Information, DCI,

wherein if the data are in the initial transmission,

the first indication is of one bit, and the second indication is of five bits;

and

wherein if the data are in the retransmission,

the first indication is of one bit, and the third indication is of three bits.