CONTROL INFORMATION TRANSMISSION AND UPLINK CONTROL CHANNEL RESOURCE MAPPING

• US 20140036803A1
• Filed: 07/19/2013
• Published: 02/06/2014
• Est. Priority Date: 08/06/2012
• Status: Active Grant

• Current Assignee: Google Inc. (Alphabet Inc.)
• Original Assignee: KT Corporation
• Inventors: PARK, Kyu Jin
• Granted Patent: US 9,167,575 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The disclosure is related to transmitting downlink control information through a downlink control channel adopted in a data region, and transmitting uplink control information for user equipment receiving the downlink control information. Furthermore, the disclosure is related to performing a physical uplink control channel (PUCCH) resource mapping for uplink HARQ-ACK/NACK feedback of user equipment. Herein, the uplink HARQ-ACK/NACK feedback may be performed by the user equipment in response to a downlink data channel assigned according to downlink scheduling information transmitted through the adopted downlink control channel.

Claims

1. A method of transmitting control information for a specific user equipment through a data region of physical resource-block (PRB) pairs in a subframe, in a transmission/reception point, the method comprising:

assigning at least one enhanced physical downlink control channel (EPDCCH) set, wherein each EPDCCH set includes an X number of PRB pairs in the subframe, and the X is a natural number which is greater than or equal to “

1” and

is less than or equal to the number of resource blocks (RBs) per downlink bandwidth; and

transmitting the control information to the specific user equipment through at least one of at least two enhanced control channel elements (ECCEs) indexed per EPDCCH set.

2. The method of claim 1, wherein:

each of the ECCEs includes at least one of four and eight resource-element groups; and

the at least one of four and eight resource-element groups of each ECCE are located in one PRB pair or at least two PRB pairs.

3. The method of claim 1, wherein:

the control information includes downlink scheduling information; and

a lowest index of the at least one ECCE which transmits the control information and is indexed per EPDCCH set is used as one resource determination component in the case of a physical uplink control channel (PUCCH) resource mapping for ACK/NACK associated with a physical downlink shared channel (PDSCH) assigned according to the downlink scheduling information.

4. The method of claim 3, wherein the EPDCCH set is a distributed EPDCCH set, where resource-element groups of each ECCE are located in two or more PRB pairs.

5. The method of claim 1, wherein a lowest index of PRB pairs transmitting the control information among the X number of PRB pairs of the each EPDCCH set is used as one resource determination component, in the case of a physical uplink control channel (PUCCH) resource mapping of ACK/NACK associated with a physical downlink shared channel (PDSCH) assigned according to downlink scheduling information.

6. The method of claim 5, wherein a product of the lowest PRB pair index and the number of ECCEs per PRB pair is used as one resource determination component, in the case of a PUCCH resource mapping for ACK/NACK associated with a PDSCH assigned according to the downlink scheduling information.

7. The method of claim 6, wherein the EPDCCH set is a localized EPDCCH set, where resource-element groups of each ECCE are located in one PRB pair.

8. A method of mapping an uplink control channel resource in user equipment, the method comprising:

receiving control information including downlink scheduling information through at least one of at least two enhanced control channel elements (ECCEs) from a transmission/reception point, wherein the at least two ECCEs are indexed per each of at least one enhanced physical downlink control channel (EPDCCH) set, the each EPDCCH set includes an X number of physical resource-block (PRB) pairs in a subframe, and the X is a natural number which is greater than or equal to “

1” and

is less than or equal to the number of resource blocks (RBs) per downlink bandwidth; and

performing a physical uplink control channel (PUCCH) resource mapping for ACK/NACK associated with a physical downlink shared channel (PDSCH) assigned according to the downlink scheduling information, using a lowest index as one resource determination component, wherein the lowest index is at least one of a lowest index of the at least one ECCE used for reception of the control information and a lowest index of PRB pairs used for reception of the control information among the X number of PRB pairs of the EPDCCH set.

9. The method of claim 8, wherein:

each of the ECCEs includes at least one of four and eight resource-element groups; and

the at least one of four and eight resource-element groups of each ECCE are located in one PRB pair or at least two PRB pairs.

10. The method of claim 8, wherein in the case of performing the PUCCH resource mapping using the lowest ECCE index as one resource determination component,

the EPDCCH set is a distributed EPDCCH set, where resource-element groups of each ECCE are located in two or more PRB pairs.

11. The method of claim 8, wherein, in the case of performing the PUCCH resource mapping using the lowest PRB pair index as one resource determination component,

a product of the lowest PRB pair index and the number of ECCEs per PRB pair is used as one resource determination component for the PUCCH resource mapping.

12. The method of claim 11, wherein the EPDCCH set is a localized EPDCCH set, where resource-element groups of each ECCE are located in one PRB pair.

13. A transmission/reception point for transmitting control information for a specific user equipment through a data region of physical resource-block (PRB) pairs in a subframe, the transmission/reception point comprising:

a control unit configured to assign at least one enhanced physical downlink control channel (EPDCCH) set, wherein each EPDCCH set includes an X number of PRB pairs in the subframe, and the X is a natural number which is greater than or equal to “

1” and

is less than or equal to the number of resource blocks (RBs) per downlink bandwidth; and

a transmitting unit configured to transmit the control information to the specific user equipment through at least one of at least two enhanced control channel elements (ECCEs) indexed per EPDCCH set.

14. The transmission/reception point of claim 13, wherein:

the control information includes downlink scheduling information; and

a lowest index of the at least one ECCE which is used for transmission of the control information and is indexed per EPDCCH set is used as one resource determination component in the case of a physical uplink control channel (PUCCH) resource mapping for ACK/NACK associated with a physical downlink shared channel (PDSCH) assigned according to the downlink scheduling information.

15. The transmission/reception point of claim 14, wherein the EPDCCH set is a distributed EPDCCH set, where resource-element groups of each ECCE are located in two or more PRB pairs.

16. The transmission/reception point of claim 13, wherein:

a product of a lowest PRB pair index and the number of ECCEs per PRB pair is used as one resource determination component, in the case of a physical uplink control channel (PUCCH) resource mapping for ACK/NACK associated with a physical downlink shared channel (PDSCH) assigned according to the downlink scheduling information; and

the lowest PRB pair index is a lowest index of PRB pairs used for transmission of the control information among the X number of PRB pairs of the each EPDCCH set.

17. The transmission/reception point of claim 16, wherein the EPDCCH set is a localized EPDCCH set, where resource-element groups of each ECCE are located in one PRB pair.

18. User equipment comprising:

a receiving unit configured to receive control information including downlink scheduling information through at least one of at least two enhanced control channel elements (ECCEs) from a transmission/reception point, wherein the at least two ECCEs are indexed per each of at least one enhanced physical downlink control channel (EPDCCH) set, the each EPDCCH set includes an X number of physical resource-block (PRB) pairs in a subframe, and the X is a natural number which is greater than or equal to “

1” and

is less than or equal to the number of resource blocks (RBs) per downlink bandwidth; and

a control unit configured to perform a physical uplink control channel (PUCCH) resource mapping for an ACK/NACK associated with a physical downlink shared channel (PDSCH) assigned according to the downlink scheduling information, using a lowest index as a resource determination component, wherein the lowest index is at least one of (i) a lowest index of the at least one ECCE used for reception of the control information and (ii) a product of a lowest PRB pair index and the number of ECCEs per PRB pair; and

the lowest PRB pair index is a lowest index of PRB pairs used for reception of the control information among the X number of PRB pairs of the EPDCCH set.

19. The user equipment of claim 18, wherein in the case of performing the PUCCH resource mapping using the lowest ECCE index as one resource determination component,

the EPDCCH set is a distributed EPDCCH set, where resource-element groups of the each ECCE are located in two or more PRB pairs.

20. The user equipment of claim 18, wherein

in the case that a product of the lowest PRB pair index and the number of ECCEs configured in each PRB pair is used as one resource determination component for the PUCCH resource mapping,

the EPDCCH set is a localized EPDCCH set, where resource-element groups of each ECCE are located in one PRB pair.