METHOD AND APPARATUS OF ALLOCATING UPLINK FEEDBACK CHANNEL FOR FEEDING BACK DATA CORRESPONDING TO AN ENHANCED-PHYSICAL DOWNLINK CONTROL CHANNEL (E-PDCCH)

• US 20120213163A1
• Filed: 08/24/2011
• Published: 08/23/2012
• 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
• Granted Patent: US 8,681,726 B2
• Time in Patent Office: Days
• 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 that includes 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, wherein the respective CCEs each have different indices;

allocating information that is associated with 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 to which control information of the data packet is transmitted; and

feeding back, to the base station, the information that is associated with 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 a physical downlink control channel (PDCCH) and an enhanced PDCCH (E-PDCCH).

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

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

allocating information that is associated with 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 from among indices of at least one CCE included in the CCE aggregation.

5. The method of claim 1, wherein the information that is associated with whether the decoding of the data packet was successful comprises one of an acknowledgement (ACK) response if the decoding was successful and a negative acknowledgement (NACK) if the decoding was unsuccessful for a hybrid automatic repeat request (HARQ).

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 obtaining comprises obtaining the uplink feedback channel additionally including resource areas, the number of the 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 that is associated with whether the decoding of the data packet was successful to the additionally included resource areas in response to the data packet being associated with the at least one layer added for the spatial multiplexing.

7. The method of claim 1, wherein, when one of the at least two different resource allocation control channels obtains a SMG:

the allocating comprises allocating the information that is associated with 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 from among indices of the at least one CCE included in the CCE aggregation and an offset of a layer associated with the data packet, in response to the data packet being associated with at least one layer added for spatial multiplexing.

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

9. 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 including resource areas that are respectively mapped to indices of control channel elements (CCEs) of a resource allocation control channel that includes a largest number of CCEs from among at least two different resource allocation control channels;

allocating information that is associated with 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 that is associated with the data packet and an initial index from among indices of at least one CCE included in a CCE aggregation to which control information with respect to the data packet is transmitted; and

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

10. The method of claim 9, wherein each of the resource allocation control channels includes a plurality of CCEs of which indices are sequential from 1 to a number of CCEs included in a corresponding resource allocation control channel.

11. The method of claim 9, wherein the allocating comprises

allocating the information that is associated with 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 from among the indices of the at least one CCE included in the CCE aggregation to which the control information of the data packet is transmitted.

12. The method of claim 9, 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 that is associated with 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 from among the indices of the at least one CCE included in the CCE aggregation to which the control information of the data packet is transmitted, in response to the data packet being associated with the first resource allocation control channel; and

allocating the information that is associated with 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 from among the indices of at least one CCE included in the CCE aggregation to which the control information of the data packet is transmitted, in response to the data packet being associated with the second allocation control channel.

13. The method of claim 9, wherein the at least two different resource allocation control channels comprise a downlink physical control channel (PDCCH) and an enhanced PDCCH (E-PDCCH).

14. The method of claim 9, wherein the at least two different resource allocation control channels each comprise PDCCHs that correspond to two multi-carriers.

15. A communication method of a base station that transmits control information with respect to 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 with respect to mapping relations between resource areas of an uplink feedback channel of a terminal and information that is associated with whether decoding of data packets associated with the second resource allocation control channel was successful, to enable resource areas of the uplink feedback channel associated with the first resource allocation control channel and resource areas of the uplink feedback channel associated with the second resource allocation control channel, to not overlap each other; and

transmitting the offsets to the terminal.

16. The method of claim 15, wherein the resource areas of the uplink feedback channel associated with the first resource allocation channel are used to feedback data indicating whether data packets associated with the first resource allocation channel were successfully decoded, and the resource areas of the uplink feedback channel associated with the second resource allocation channel are used to feedback data indicating whether data packets associated with the second resource allocation channel were successfully decoded

17. The method of claim 15, 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.

18. The method of claim 15, wherein the first resource allocation control channel corresponds to a PDCCH and the second resource allocation control channel corresponds to an E-PDCCH.

19. The method of claim 15, wherein:

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

the first resource allocation control channel and the second resource allocation control channel correspond to a PDCCH that correspond to a first carrier and a PDCCH that corresponds to a second carrier, respectively.

20. A computer-readable storage medium having stored therein program instructions to cause a processor to implement 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 that includes 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, wherein the respective CCEs each have different indices;

allocating information that is associated with 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 to which control information of the data packet is transmitted; and

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

21. 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 uplink channel information that includes resource areas that are mapped to indices of control channel elements (CCEs) included a 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 to feed back the acknowledgment information to the base station via the allocated resource areas of the uplink control channel.

22. The terminal of claim 21, wherein the uplink control channel comprises a physical uplink control channel (PUCCH) in a third generation partnership project (3GPP) long-term evolution (LTE) environment.

23. The terminal of claim 21, wherein the uplink channel comprises a plurality of resource areas that are one-to-one mapped to the indices of the CCEs included in the downlink channel.

24. The terminal of claim 21, wherein the terminal shares the uplink channel with at least one other terminal, and the receiver is further configured to receive an offset from the base station to prevent the controller from allocating a resource area that is to be used by the at least one other terminal.

25. The terminal of claim 24, 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, to receive resource allocation information associated with the data packet via a physical downlink control channel (PDCCH), and the offset is received in a downlink control information (DCI) field that is received via the PDCCH.