Method and device for configuring central subcarrier

• US 9,084,250 B2
• Filed: 11/09/2012
• Issued: 07/14/2015
• Est. Priority Date: 05/11/2010
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Bai, Wei, Wan, Lei, Ma, Sha, Yan, Zhiyu, Yu, Zheng, Xue, Lixia
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): JONES, PRENELL P
• Application Number:
  US13/673,515
• Publication Number:
  US 20130070708A1
• Time in Patent Office: 977 Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method and a device for configuring a central subcarrier are disclosed. The method comprises: mapping a first downlink control channel onto a part (f1) of a downlink bandwidth (fW) of a cell, and configuring a first virtual central subcarrier in f1, where f1 is different or partly different from a bandwidth f2 mapped to a second downlink control channel, an overlap between f1 and f2 is at least one subcarrier, or at least one idle subcarrier exists between f1 and f2, or at least one non-idle subcarrier and at least one idle subcarrier exist between f1 and f2; the first virtual central subcarrier is located on a grid position of a central frequency, a distance between the first virtual central subcarrier and a second virtual central subcarrier configured in f2 is an integer multiple of a frequency domain width of the subcarrier.

Claims

1. A method for configuring a central subcarrier, comprising:

mapping, by a base station, a first downlink control channel onto a part (f1) of a downlink bandwidth (fW) of a cell, and configuring a first virtual central subcarrier in f1; and

mapping, by the base station, a downlink data channel onto fW of the cell, and configuring, by the base station, a central subcarrier on fW, wherein

f1 is different from a bandwidth f2 mapped to a second downlink control channel of the cell or a neighboring cell, an overlap between f1 and f2 is at least one subcarrier, or at least one idle subcarrier exists between f1 and f2, or at least one non-idle subcarrier and at least one idle subcarrier exist between f1 and f2; and

the first virtual central subcarrier is located on a grid position of a central frequency, a distance between the first virtual central subcarrier and a second virtual central subcarrier configured in f2 is an integer multiple of a frequency domain width of the subcarrier, and borders of physical resource blocks (PRBs) are aligned between the cell and the neighboring cell.

2. The method according to claim 1, wherein:

the first virtual central subcarrier is located on a grid position of a central frequency, and the distance between the first virtual central subcarrier and the second virtual central subcarrier configured in f2 is an integer multiple of the frequency domain width of the subcarrier, which comprises;

the second virtual central subcarrier is located on the grid position of the central frequency, the distance between the first virtual central subcarrier and the second virtual central subcarrier is an integer multiple of a grid frequency domain width of the central frequency, and the distance between the first virtual central subcarrier and the second virtual central subcarrier is an integer multiple of the frequency domain width of the subcarrier.

3. The method according to claim 1, wherein:

in the case of multi-carrier transmission, the bandwidth f2 mapped to the second downlink control channel comprises the bandwidth f2 of the second downlink control channel mapped to the cell; and

in the case of orthogonal transmission of the downlink control channel, the bandwidth f2 mapped to the second downlink control channel comprises the bandwidth f2 of the second downlink control channel mapped to the neighboring cell.

4. The method according to claim 1, wherein the configuring, by the base station, the central subcarrier on fW comprises at least one of the following steps:

configuring, by the base station, the central subcarrier on an overlapping subcarrier between f1 and f2, and configuring, by the base station, the central subcarrier on an idle subcarrier between f1 and f2.

5. The method according to claim 4, further comprising:

sending, by the base station, downlink control channel signals and/or downlink reference signals on subcarriers other than the overlapping subcarrier between f1 and f2.

6. The method according to claim 5, wherein the sending, by the base station, the downlink control channel signals and/or downlink reference signals on the subcarriers other than the overlapping subcarrier between f1 and f2 comprises:

sending, by the base station, signals of PCFICH, and/or PHICH, and/or CRS, and/or CSI-RS on the subcarriers other than the overlapping subcarrier between f1 and f2.

7. The method according to claim 4, wherein

physical resource blocks (PRBs) adjacent to the overlapping subcarrier between f1 and f2 comprise subcarriers other than the overlapping subcarrier between f1 and f2.

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

when a coverage scope of the cell is less than a first threshold, increasing by the base station, bandwidth occupied in fW and decreasing, by the base station, protection bandwidth occupied in fW.

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

setting, by the base station, an idle subcarrier or a non-idle subcarrier on the second virtual central subcarrier of the cell, wherein the idle subcarrier or non-idle subcarrier belongs to a neighboring PRB.

10. A device for configuring a central subcarrier, comprising:

a first mapping and configuring unit, configured to;

map a first downlink control channel onto a part (f1) of a downlink bandwidth (fW) of a cell, and configure a first virtual central subcarrier in f1, wherein f1 is different from a bandwidth (f2) mapped to a second downlink control channel, an overlap between f1 and f2 is at least one subcarrier, or at least one idle subcarrier exists between f1 and f2, or at least one non-idle subcarrier and at least one idle subcarrier exist between f1 and f2;

the first virtual central subcarrier is located on a grid position of a central frequency, a distance between the first virtual central subcarrier and a second virtual central subcarrier configured in f2 is an integer multiple of a frequency domain width of the subcarrier, and physical resource blocks (PRBs) are aligned between the cell and a neighboring cell; and

a second mapping and configuring unit, configured to map a downlink data channel onto fW of the cell, and configure a central subcarrier on fW.

11. The device according to claim 10, wherein:

the first virtual central subcarrier is located on a grid position of a central frequency, and the distance between the first virtual central subcarrier and the second virtual central subcarrier configured in f2 is an integer multiple of the frequency domain width of the subcarrier, which comprises;

the second virtual central subcarrier is located on the grid position of the central frequency, the distance between the first virtual central subcarrier and the second virtual central subcarrier is an integer multiple of a grid frequency domain width of the central frequency, and the distance between the first virtual central subcarrier and the second virtual central subcarrier is an integer multiple of the frequency domain width of the subcarrier.

12. The device according to claim 10, wherein:

in the case of multi-carrier transmission, the bandwidth f2 mapped to the second downlink control channel comprises the bandwidth f2 of the second downlink control channel mapped to the cell; and

in the case of orthogonal transmission of the downlink control channel, the bandwidth f2 mapped to the second downlink control channel comprises the bandwidth f2 of the second downlink control channel mapped to the neighboring cell.

13. The device according to claim 10, wherein the second mapping and configuring unit is specifically configured to:

map a downlink data channel onto fW of the cell;

configure at least one of the central subcarrier on an overlapping subcarrier between f1 and f2 and a central subcarrier on the idle subcarrier between f1 and f2.

14. The device according to claim 13, further comprising:

a sending unit, configured to send downlink control channel signals and/or downlink reference signals on subcarriers other than the overlapping subcarrier between f1 and f2.

15. The device according to claim 14, wherein the sending unit is specifically configured to:

send signals of PCFICH, and/or PHICH, and/or CRS, and/or CSI-RS on subcarriers other than the overlapping subcarrier between f1 and f2.

16. The device according to claim 13, wherein physical resource blocks (PRBs) adjacent to the overlapping subcarrier between f1 and f2 comprise subcarriers other than the overlapping subcarrier between f1 and f2.

17. The device according to claim 10, further comprising:

a bandwidth adjusting unit, configured to;

increase the bandwidth occupied in fW and decrease the protection bandwidth occupied in fW when a coverage scope of the cell is less than a first threshold.

18. The device according to claim 10, further comprising:

a configuring unit, configured to set an idle subcarrier or a non-idle subcarrier on the second virtual central subcarrier of the cell, wherein the idle subcarrier or non-idle subcarrier belongs to a neighboring PRB.