METHOD AND APPARATUS FOR ESTABLISHING A MAPPING BETWEEN ENHANCED DOWNLINK CONTROL CHANNEL RESOURCE AND ANTENNA PORT

• US 20150189634A1
• Filed: 03/13/2015
• Published: 07/02/2015
• Est. Priority Date: 09/14/2012
• Status: Active Grant

• Current Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Device Company Limited (Huawei Investment & Holding Co., Ltd.)
• Inventors: WANG, Jian, WU, Qiang
• Granted Patent: US 10,009,880 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/26035 Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences using different training sequence per antenna H04B7/0684; code allocation H04J13/16
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0058 Allocation criteria
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention provides a method and apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port. The method includes: establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port; and establishing a correspondence between control data carried by the resource element and an antenna port corresponding to the resource element, so as to send or receive, according to a reference signal corresponding to the antenna port, the control data carried by the resource element. The present invention determines a manner for establishing a mapping between a resource on an ePDCCH and an antenna port, and meets a requirement of LTE development.

Claims

1. A method for establishing a mapping between an enhanced downlink control channel resource and an antenna port, comprising:

establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port; and

establishing a correspondence between control data carried by the resource element and an antenna port corresponding to the resource element, so as to send or receive, according to a reference signal corresponding to the antenna port, the control data carried by the resource element.

2. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 1, wherein one resource block pair PRB pair in the enhanced downlink control channel resource comprises multiple resource element groups, and each of the resource element groups comprises multiple resource elements;

and

the establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port comprises that;

in each of the resource element groups, antenna ports corresponding to the resource elements in the resource element group are in rotation according to an order of logical indexes of the multiple resource elements.

3. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 2, wherein the establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port further comprises that:

in the multiple resource element groups, antenna ports corresponding to the resource elements that have a same logical index but belong to different resource element groups are the same.

4. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 2, wherein the establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port further comprises that:

in the multiple resource element groups, antenna ports corresponding to the resource elements that have a same logical index but belong to different resource element groups are on a preset rotating cycle according to an order of logical indexes of the resource element groups.

5. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 1, wherein one resource block pair PRB pair in the enhanced downlink control channel resource comprises multiple orthogonal frequency division multiplexing OFDM symbols in a time domain, each of the OFDM symbols comprises multiple resource elements, and each of the resource elements corresponds to a subcarrier in a frequency domain;

and

the establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port comprises;

determining a mapping between the resource element and an antenna port according to a physical index, wherein the physical index comprises an OFDM symbol index corresponding to the OFDM symbol, and a subcarrier index corresponding to the subcarrier.

6. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 5, wherein the determining a mapping between the resource element and an antenna port according to a physical index comprises that:

in each of the OFDM symbols, antenna ports corresponding to all the resource elements comprised in the OFDM symbol are the same; and

in the multiple OFDM symbols, antenna ports corresponding to the resource elements in different OFDM symbols are on a preset rotating cycle according to an order of the OFDM symbol indexes in the time domain.

7. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 6, the method further comprises:

performing a cyclic shift, in the time domain, for antenna ports corresponding to multiple resource elements corresponding to some subcarrier indexes in the frequency domain.

8. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 5, wherein the determining a mapping between the resource element and an antenna port according to a physical index comprises that:

antenna ports corresponding to multiple resource elements that correspond to a same subcarrier index are the same; and

antenna ports corresponding to different resource elements that correspond to different subcarrier indexes are on a preset rotating cycle according to an order specified by the subcarrier index in the frequency domain.

9. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 8, the method further comprises:

performing a cyclic shift, in the frequency domain, for antenna ports corresponding to multiple resource elements corresponding to some OFDM symbol indexes in the time domain.

10. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 2, wherein the enhanced downlink control channel resource comprises multiple PRB pairs;

and each of the PRB pairs undergoes the step of establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port, wherein

the multiple PRB pairs have a same mapping between the resource element and an antenna port.

11. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 2, wherein the enhanced downlink control channel resource comprises multiple PRB pairs;

and each of the PRB pairs undergoes the step of establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port; and

in the multiple PRB pairs, antenna ports corresponding to resource elements at corresponding locations in different PRB pairs are on a preset rotating cycle according to an order of physical indexes of the PRB pairs in the frequency domain.

12. The method for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 2, wherein the enhanced downlink control channel resource comprises multiple PRB pairs;

and each of the PRB pairs undergoes the step of establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port; and

in the multiple PRB pairs, antenna ports corresponding to resource elements at corresponding locations in different PRB pairs are on a preset rotating cycle according to an order of logical indexes of the PRB pairs in the enhanced downlink control channel resource.

13. An apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port, comprising:

a resource mapping unit, configured to establish a mapping between each resource element in an enhanced downlink control channel resource and an antenna port; and

a data mapping unit, configured to establish a correspondence between control data carried by the resource element and an antenna port corresponding to the resource element, so as to send or receive, according to a reference signal corresponding to the antenna port, the control data carried by the resource element.

14. The apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 13, wherein one resource block pair PRB pair in the enhanced downlink control channel resource comprises multiple resource element groups, and each of the resource element groups comprises multiple resource elements;

and

the resource mapping unit is specifically configured to set that in each of the resource element groups, antenna ports corresponding to the resource elements in the resource element group are in rotation according to an order of logical indexes of the multiple resource elements.

15. The apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 14, wherein:

the resource mapping unit is further configured to set that in the multiple resource element groups, antenna ports corresponding to the resource elements that have a same logical index but belong to different resource element groups are the same.

16. The apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 14, wherein:

the resource mapping unit is further configured to set that in the multiple resource element groups, antenna ports corresponding to the resource elements that have a same logical index but belong to different resource element groups are on a preset rotating cycle according to an order of logical indexes of the resource element groups.

17. The apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 13, wherein one resource block pair PRB pair in the enhanced downlink control channel resource comprises multiple orthogonal frequency division multiplexing OFDM symbols in a time domain, each of the OFDM symbols comprises multiple resource elements, and each of the resource elements corresponds to a subcarrier in a frequency domain;

and

the resource mapping unit is specifically configured to determine a mapping between the resource element and an antenna port according to a physical index, wherein the physical index comprises an OFDM symbol index corresponding to the OFDM symbol, and a subcarrier index corresponding to the subcarrier.

18. The apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 17, wherein the resource mapping unit comprises any one or multiple of:

a first mapping subunit, a second mapping subunit, a third mapping subunit, and a fourth mapping subunit, wherein;

the first mapping subunit is configured to set that in each of the OFDM symbols, antenna ports corresponding to all the resource elements comprised in the OFDM symbol are the same; and

in the multiple OFDM symbols, antenna ports corresponding to the resource elements in different OFDM symbols are on a preset rotating cycle according to an order of the OFDM symbol indexes in the time domain;

the second mapping subunit is configured to;

after processing performed by the first mapping subunit, set that a cyclic shift is performed, in the time domain, for antenna ports corresponding to multiple resource elements corresponding to some subcarrier indexes in the frequency domain;

the third mapping subunit is configured to set that antenna ports corresponding to multiple resource elements that correspond to a same subcarrier index are the same; and

antenna ports corresponding to different resource elements that correspond to different subcarrier indexes are on a preset rotating cycle according to an order of the subcarrier indexes in the frequency domain; and

the fourth mapping subunit, configured to;

after processing performed by the third mapping subunit, set that a cyclic shift is performed, in the frequency domain, for antenna ports corresponding to multiple resource elements corresponding to some OFDM symbol indexes in the time domain.

19. The apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 14, wherein the enhanced downlink control channel resource comprises multiple PRB pairs;

and

the resource mapping unit is configured to perform, for each of the PRB pairs, the step of establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port; and

is further configured to set that the multiple PRB pairs have a same mapping between the resource element and an antenna port.

20. The apparatus for establishing a mapping between an enhanced downlink control channel resource and an antenna port according to claim 14, wherein the enhanced downlink control channel resource comprises multiple PRB pairs;

and

the resource mapping unit is configured to perform, for each of the PRB pairs, the step of establishing a mapping between each resource element in an enhanced downlink control channel resource and an antenna port; and

is further configured to set that in the multiple PRB pairs, antenna ports corresponding to resource elements at corresponding locations in the different PRB pairs are on a preset rotating cycle according to an order of physical indexes or logical indexes of the PRB pairs.

21. An apparatus for mapping between an enhanced downlink control channel resource and an antenna port, comprising:

a processor, configured to establish a mapping between each resource element in an enhanced downlink control channel resource and an antenna port, and establish a correspondence between control data carried by the resource element and an antenna port corresponding to the resource element; and

a memory, configured to store the mapping established between each resource element and an antenna port by the processor and to store the correspondence established between the control data and an antenna port by the processor.