Method for Sending and Detecting Downlink Control Information

• US 20120033627A1
• Filed: 04/27/2010
• Published: 02/09/2012
• Est. Priority Date: 04/29/2009
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Dai, Bo, Yu, Guanghui, Chen, Yijian, Li, Weijun
• Granted Patent: US 8,797,978 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0082 at predetermined intervals
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/14 Two-way operation using the same type of signal, i.e. duplex
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method for sending and detecting downlink control information is provided. A base station carries the downlink control information in a physical downlink control channel, and sends said physical downlink control channel through component carriers. Said base station bears first type downlink control information on an anchor component carrier, and bears third type downlink control information on a prime component carrier, wherein said first type downlink control information bears one or more types of uplink scheduling information, downlink scheduling information and uplink power control information of its component carrier, said third type downlink control information bears indication information of the second type downlink control information which bears the uplink scheduling information and/or the downlink scheduling information of one or more component carriers. A terminal detects the first type downlink control information on the anchor component carries and detects the third type downlink control information on the prime component carrier.

Claims

1. A method for sending downlink control information, wherein a base station carries the downlink control information in a physical downlink control channel, sends said physical downlink control channel through component carriers, said method comprising:

said base station bearing first type downlink control information on an anchor component carrier, and bearing third type downlink control information on a prime component carrier, wherein

said first type downlink control information bears one or more types of uplink scheduling information, downlink scheduling information and uplink power control information of the component carrier of said first type downlink control information, said third type downlink control information bears indication information of second type downlink control information, and said second type downlink control information bears the uplink scheduling information and/or the downlink scheduling information of one or more component carriers.

2. The method as claimed in claim 1, wherein

a number of said component carriers is n, and when said base station transmits data to a terminal on n component carriers, one component carrier is the anchor component carrier, and one or two component carriers are prime component carriers, 1<

n≦

5.

3. The method as claimed in claim 2, wherein

said anchor component carrier and the prime component carrier are semi-statically configured by higher layer signaling, and said anchor component carrier and the prime component carrier are UE-specific anchor component carrier and prime component carrier.

4. The method as claimed in claim 1, wherein

the indication information of the second type downlink control information borne in said third type downlink control information includes one or more types of following information:

the indication information of downlink control information format included in the second type downlink control information, the indication information of the component carrier of the second type downlink control information, the indication information of an aggregation level of a control channel element and a start position of a control channel element of the physical downlink control channel bearing the second type downlink control information, and uplink scheduling indication information or downlink scheduling indication information.

5. The method as claimed in claim 4, wherein

said third type downlink control information includes:

1 bit for uplink scheduling indication information or downlink scheduling indication information, 2*n bits for the indication information of the downlink control information format included in the second type downlink control information, ┌

log₂ n┐

bits for an index of the component carrier of the second type downlink control information;

6 bits for the aggregation level of the control channel element and start position of the control channel element of the physical downlink control channel bearing the second type downlink control information, and n is the number of downlink component carriers allocated to the terminal;

or

said third type downlink control information includes;

2*n bits for the indication information of the downlink control information format included in the second type downlink control information of downlink scheduling, ┌

log₂ n┐

bits for the index of the component carrier of the second type downlink control information of the downlink scheduling;

6 bits for the aggregation level of the control channel element and the start position of the control channel element of the physical downlink control channel bearing the second type downlink control information of the downlink scheduling, 2*m bits for the indication information of the downlink control information format included in the second type downlink control information of uplink scheduling, ┌

log₂ n┐

bits for the index of the component carrier of the second type downlink control information of the uplink scheduling;

6 bits for the aggregation level of the control channel element and the start position of the control channel element of the physical downlink control channel bearing the second type downlink control information of the uplink scheduling, and n is the number of downlink component carriers allocated to the terminal; and

m is the number of uplink component carriers allocated to the terminal.

6. The method as claimed in claim 1, wherein

the uplink scheduling information and/or the downlink scheduling information of one or more component carriers borne in said second type downlink control information is:

a combination of the downlink control information of the uplink scheduling information and/or the downlink control information of the downlink scheduling information of k1 component carriers allocated to the terminal, and k1 is determined according to the indication information of the downlink control information format included in the second downlink control information borne in said third type downlink control information, 1≦

k1≦

n;

or

a combination of allocated k2 pieces of the downlink control information of the downlink scheduling information and/or allocated l pieces of the downlink control information of the uplink scheduling information, wherein k2 and l are determined according to the indication information of the downlink control information format included in the second downlink control information borne in said third type downlink control information, 1≦

k2≦

n and 1≦

l≦

m, n is the number of downlink component carriers allocated to the terminal; and

m is the number of uplink component carriers allocated to the terminal.

15. The method as claimed in claim 4, wherein

the uplink scheduling information and/or the downlink scheduling information of one or more component carriers borne in said second type downlink control information is:

a combination of the downlink control information of the uplink scheduling information and/or the downlink control information of the downlink scheduling information of k1 component carriers allocated to the terminal, and k1 is determined according to the indication information of the downlink control information format included in the second downlink control information borne in said third type downlink control information, 1≦

k1≦

n;

or

a combination of allocated k2 pieces of the downlink control information of the downlink scheduling information and/or allocated l pieces of the downlink control information of the uplink scheduling information, wherein k2 and l are determined according to the indication information of the downlink control information format included in the second downlink control information borne in said third type downlink control information, 1≦

k2≦

n and 1≦

l≦

m, n is the number of downlink component carriers allocated to the terminal; and

m is the number of uplink component carriers allocated to the terminal.

7. (canceled)

8. A method for detecting downlink control information, comprising:

a terminal blindly detecting first type downlink control information on a anchor component carrier, and blindly detecting third type downlink control information on a prime component carrier;

wherein

said first type downlink control information bears one or more types of uplink scheduling information, downlink scheduling information and uplink power control information of the component carrier of said first type downlink control information, said third type downlink control information bears indication information of second type downlink control information, and said second type downlink control information bears the uplink scheduling information and/or the downlink scheduling information of one or more component carriers.

9. The method as claimed in claim 8, wherein the indication information of the second type downlink control information borne in said third type downlink control information includes one or more types of following information:

the indication information of downlink control information format included in the second type downlink control information, the indication information of the component carrier of the second type downlink control information, the indication information of an aggregation level of a control channel element and a start position of a control channel element of the physical downlink control channel bearing the second type downlink control information, and uplink scheduling indication information or downlink scheduling indication information.

10. The method as claimed in claim 8, further comprising:

when the terminal detects the third type downlink control information on the prime component carrier, the terminal obtains codewords of the second type downlink control information from a control channel element set on a specified component carrier to decode the second type downlink control information according to the indication information of the second type downlink control information borne in the third type downlink control information.

11. The method as claimed in claim 8, wherein said anchor component carrier and prime component carriers are semi-statically configured by higher layer signaling, and said anchor component carrier and the prime component carrier are UE-specific anchor component carrier and prime component carrier.

12. The method as claimed in claim 8, wherein the downlink control information format of the first type downlink control information blindly detected by the terminal on the anchor component carrier and the downlink control information format of the third type downlink control information blindly detected by the terminal on the prime component carrier are determined by a related configuration of higher layer signaling.

13. The method as claimed in claim 8, further comprising:

said terminal further blindly detecting the downlink control information format for common control information scheduling on the prime component carriers.

16. The method as claimed in claim 9, further comprising:

when the terminal detects the third type downlink control information on the prime component carrier, the terminal obtains codewords of the second type downlink control information from a control channel element set on a specified component carrier to decode the second type downlink control information according to the indication information of the second type downlink control information borne in the third type downlink control information.

14. A terminal, comprising a detection module, wherein

said detection module is configured to:

blindly detect first type downlink control information on an anchor component carrier, and blindly detect third type downlink control information on a prime component carrier;

wherein said first type downlink control information bears one or more types of uplink scheduling information, downlink scheduling information and uplink power control information of the component carrier of said first type downlink control information, said third type downlink control information bears indication information of second type downlink control information, and said second type downlink control information bears the uplink scheduling information and/or the downlink scheduling information of one or more component carriers.