Method and apparatus of allocating uplink feedback channel for feeding back data corresponding to an enhanced-physical downlink control channel (E-PDCCH)

• US 8,681,726 B2
• Filed: 08/24/2011
• Issued: 03/25/2014
• Est. Priority Date: 02/17/2011
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd., University-Industry Cooperation Foundation of Korea Aerospace University
• Original Assignee: Samsung Electronics Co. Ltd., University-Industry Cooperation Foundation of Korea Aerospace University
• Inventors: Lee, Heun Chul, Clerckx, Bruno, Jung, Young Ho
• Primary Examiner(s): Ton, Dang T
• Assistant Examiner(s): Aung, Sai
• Application Number:
  US13/216,573
• Publication Number:
  US 20120213163A1
• Time in Patent Office: 944 Days
• Field of Search: 370/329, 370/340, 370/241, 370/260, 375/295, 375/316, 375/224, 375/260, 455/450, 455/269
• US Class Current: 370/329
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 1/1864 ARQ related signaling H04L1/1607 takes precedence
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management

Abstract

Provided is an uplink feedback channel allocation method and apparatus used to feedback data to indicate whether data packets corresponding an enhanced physical downlink control channel (E-PDCCH) were successfully decoded. A terminal may use an additional resource area of an uplink feedback channel or may use an empty resource area of the uplink feedback channel to which feedback information of a data packet corresponding to a physical downlink control channel (PDCCH) is not allocated, to perform feedback.

Claims

1. A communication method of a terminal that performs feedback as to whether decoding of data packets was successful in a wireless communication system, the method comprising:

obtaining an uplink feedback channel comprising resource areas that are respectively mapped to indices of control channel elements (CCEs) that are included in at least two different resource allocation control channels, the CCEs having different respective indices, and the at least two different resource allocation control channels comprising a physical downlink control channel (PDCCH) and an enhanced PDCCH (E-PDCCH);

allocating information of whether decoding of a data packet transmitted by a base station was successful, to a resource area of the uplink feedback channel that is mapped to a CCE aggregation in which control information of the data packet is transmitted; and

feeding back, to the base station, the information of whether the decoding of the data packet was successful, using the resource area of the uplink feedback channel.

2. The method of claim 1, wherein the at least two different resource allocation control channels comprise PDCCHs that each correspond to a carrier for multi-carrier transmission.

3. The method of claim 1, wherein the allocating comprises:

allocating information of whether the decoding of the data packet was successful, to the resource area of the uplink feedback channel, which is mapped to an initial index among indices of at least one CCE included in the CCE aggregation.

4. The method of claim 1, wherein the information of whether the decoding of the data packet was successful comprises acknowledgement (ACK) response if the decoding was successful or a negative acknowledgement (NACK) if the decoding was unsuccessful for a hybrid automatic repeat request (HARQ).

5. The method of claim 1, wherein, when a resource allocation control channel of the at least two different resource allocation control channels obtains a spatial multiplexing gain (SMG):

the obtaining comprises obtaining the uplink feedback channel comprising additional resource areas, a number of the additional resource areas being equal to a product of a number of at least one layer added for spatial multiplexing and a number of CCEs of the resource allocation control channel that obtains the SMG; and

the allocating comprises allocating the information of whether the decoding of the data packet was successful, to the additional resource areas in response to the data packet being of the at least one layer added for the spatial multiplexing.

6. The method of claim 1, wherein, when one of the at least two different resource allocation control channels obtains a spatial multiplexing gain (SMG):

the allocating comprises allocating the information of whether the decoding of the data packet was successful, to the resource area of the uplink feedback channel, which is mapped to a sum of an initial index among indices of the at least one CCE included in the CCE aggregation and an offset of a layer of the data packet, in response to the data packet being of at least one layer added for spatial multiplexing.

7. The method of claim 6, wherein the offset is determined, in advance, based on an index of the added at least one layer.

8. A communication method of a terminal that performs feedback as to whether decoding of data packets was successful in a wireless communication system, the method comprising:

obtaining an uplink feedback channel comprising resource areas that are respectively mapped to indices of control channel elements (CCEs) of a resource allocation control channel that comprises a largest number of CCEs among at least two different resource allocation control channels;

allocating information of whether decoding of a data packet transmitted by a base station was successful, to a resource area of the uplink feedback channel, based on an offset of the data packet and an initial index among indices of at least one CCE included in a CCE aggregation in which control information of the data packet is transmitted; and

feeding back, to the base station, the information of whether the decoding of the data packet was successful, using the uplink feedback channel.

9. The method of claim 8, wherein each of the at least two resource allocation control channels comprises CCEs of which indices are sequential from 1 to a number of the CCEs.

10. The method of claim 8, wherein the allocating comprises:

allocating the information of whether the decoding of the data packet was successful, to the resource area of the uplink feedback channel, which is mapped to a sum of the offset of the data packet and the initial index among the indices of the at least one CCE included in the CCE aggregation in which the control information of the data packet is transmitted.

11. The method of claim 8, wherein:

the at least two different resource allocation control channels comprises a first resource allocation control channel and a second resource allocation control channel; and

the allocating comprises

allocating the information of whether the decoding of the data packet was successful, to a resource area of the uplink feedback channel, which is mapped to the initial index among the indices of the at least one CCE included in the CCE aggregation in which the control information of the data packet is transmitted, in response to the data packet being of the first resource allocation control channel, and

allocating the information of whether the decoding of the data packet was successful, to a resource area of the uplink feedback channel, which is mapped to a sum of the offset of the data packet and the initial index among the indices of the at least one CCE included in the CCE aggregation in which the control information of the data packet is transmitted, in response to the data packet being of the second allocation control channel.

12. The method of claim 8, wherein the at least two different resource allocation control channels comprise a physical downlink control channel (PDCCH) and an enhanced PDCCH (E-PDCCH).

13. The method of claim 8, wherein the at least two different resource allocation control channels comprise physical downlink control channels (PDCCHs) corresponding to two multi-carriers.

14. A communication method of a base station that transmits control information of data packets, using a first resource allocation control channel and a second resource allocation control channel in a wireless communication system, the method comprising:

generating offsets of mapping relations between resource areas of an uplink feedback channel of a terminal and information of whether decoding of data packets of the second resource allocation control channel was successful, to enable resource areas of the uplink feedback channel for the first resource allocation control channel and resource areas of the uplink feedback channel for the second resource allocation control channel, to not overlap each other, the first resource allocation control channel comprising a physical downlink control channel (PDCCH), and the second resource allocation control channel comprising an enhanced PDCCH (E-PDCCH); and

transmitting the offsets to the terminal.

15. The method of claim 14, wherein the resource areas of the uplink feedback channel for the first resource allocation channel are used to feedback information of whether decoding of data packets of the first resource allocation channel was successfully, and the resource areas of the uplink feedback channel for the second resource allocation channel are used to feedback information of whether the decoding of the data packets of the second resource allocation channel was successful.

16. The method of claim 14, wherein the transmitting comprises transmitting each of the offsets, to the terminal, based on a CCE aggregation to which a corresponding data packet is allocated.

17. The method of claim 14, wherein:

the base station uses a multi-carrier transmission scheme; and

the first resource allocation control channel and the second resource allocation control channel comprise a PDCCH corresponding to a first carrier and a PDCCH corresponding to a second carrier, respectively.

18. A non-transitory computer-readable storage medium storing a program comprising instructions to cause a computer to perform a communication method of a terminal that performs feedback as to whether decoding of data packets was successful in a wireless communication system, the method comprising:

obtaining an uplink feedback channel comprisinq resource areas that are respectively mapped to indices of control channel elements (CCEs) that are included in at least two different resource allocation control channels, the CCEs having different respective indices, and the at least two different resource allocation control channels comprising a physical downlink control channel (PDCCH) and an enhanced PDCCH (E-PDCCH);

allocating information of whether decoding of a data packet transmitted by a base station was successful, to a resource area of the uplink feedback channel that is mapped to a CCE aggregation in which control information of the data packet is transmitted; and

feeding back, to the base station, the information of whether the decoding of the data packet was successful, using the resource area of the uplink feedback channel.

19. A terminal to receive information from a base station via a downlink channel and to feed back information to the base station via an uplink channel, the terminal comprising:

a receiver configured to receive information of an uplink control channel comprising resource areas that are mapped to indices of control channel elements (CCEs) included in the downlink channel;

a controller configured to allocate acknowledgement information to the resource areas included in the uplink control channel, the acknowledgment information indicating whether a data packet received via the downlink channel was successfully decoded; and

a transmitter configured to feed back the acknowledgment information to the base station via the allocated resource areas of the uplink control channel,

wherein the terminal shares the uplink channel with at least one other terminal, and the receiver is further configured to receive an offset in a downlink control information (DCI) field that is received from the base station via a physical downlink control channel (PDCCH), to prevent the controller from allocating a resource area that is to be used by the at least one other terminal.

20. The terminal of claim 19, wherein the uplink control channel comprises a physical uplink control channel (PUCCH) in a third generation partnership project (3GPP) long-term evolution (LTE) environment.

21. The terminal of claim 19, wherein the resource areas are one-one mapped to the indices of the CCEs included in the downlink channel.

22. The terminal of claim 19, wherein the receiver is configured to:

receive the data packet from the base station via a physical downlink shared channel (PDSCH) of a downlink frame; and

receive resource allocation information of the data packet via the PDCCH.