INDEXING RESOURCES FOR TRANSMISSION OF ACKNOWLEDGEMENT SIGNALS IN MULTI-CELL TDD COMMUNICATION SYSTEMS

• US 20110243039A1
• Filed: 03/31/2011
• Published: 10/06/2011
• Est. Priority Date: 03/31/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: PAPASAKELLARIOU, Aris, CHO, Joon-Young
• Granted Patent: US 8,644,199 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1861 Physical mapping arrangements for ACK signaling see also H04L5/0053
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0042 intra-user or intra-terminal allocation
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• 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 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/1415 using control lines
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Methods and apparatus are described for a User Equipment (UE) to determine a set of resources available for transmitting an acknowledgement signal in an UpLink (UL) Component Carrier (CC) in response to reception of multiple DownLink (DL) Scheduling Assignments (SAs) transmitted from a base station with each DL SA being associated with a respective DL CC. The UL CC and a first DL CC establish a communication link when the UE is configured for communication over a single UL CC and a single DL CC.

Claims

1. A method for a User Equipment (UE) to determine a set of resources available for an acknowledgement signal transmission, in a communication system wherein the UE receives multiple DownLink (DL) Scheduling Assignments (SAs) transmitted from a base station, each of the DL SAs being associated with a respective DL Component Carrier (CC) and being conveyed through a respective set of Control Channel Elements (CCEs), and wherein the UE transmits the acknowledgement signal in an UpLink (UL) CC, in response to a reception of the DL SAs, the UL CC and a first DL CC establishing a communication link, when the UE is configured for communication over a single UL CC and a single DL CC, the method comprising the steps of:

determining a first set of resources for the acknowledgement signal transmission, when all the DL SAs are received in the first DL CC; and

determining a second set of resources for the acknowledgement signal transmission, when at least one of the DL SAs is received in a DL CC other than the first DL CC.

2. The method of claim 1, wherein each resource in the first set of resources is determined in a same manner.

3. The method of claim 2, wherein each resource in the first set of resources is implicitly determined from at least a first CCE used for transmission of a respective DL SA.

4. The method of claim 1, wherein a resource corresponding to the at least one DL SA received in the DL CC other than the first DL CC, with each DL CC having an index provided to the UE by the base station through radio resource control signaling, is determined from at least a first CCE used for transmission of the at least one DL SA and an offset derived from the index of the DL CC.

5. The method of claim 1, wherein each resource corresponding to each of the at least one DL SA received in each DL CC other than the first DL CC is configured to the UE by the base station through radio resource control signaling.

6. The method of claim 5, wherein each resource is indexed by an information element in the DL SA.

7. A method for a User Equipment (UE) to determine a resource for an acknowledgement signal transmission using a Downlink Assignment Index (DAI) Information Element (IE) included in each DownLink (DL) Scheduling Assignment (SA) for indicating a DL SA number and a Transmission Power Control (TPC) IE included in each DL SA for adjusting an acknowledgement signal transmission power, in a communication system wherein the UE receives multiple DL SAs transmitted from a base station, each of the DL SAs being associated with a respective DL Component Carrier (CC) and being conveyed through a respective set of Control Channel Elements (CCEs), and wherein the UE transmits in an UpLink (UL) CC an acknowledgement signal in response to a reception of the DL SAs, the UL CC and a first DL CC establishing a communication link when the UE is configured for communication over a single UL CC and a single DL CC, the method comprising the steps of:

determining a power adjustment for the acknowledgement signal transmission from a TPC IE value in a DL SA associated with the first DL CC having a DAI IE value equal to one; and

determining the resource for the acknowledgement signal transmission from a TPC IE value in each DL SA associated with the first DL CC having a DAI IE value larger than one and from a TPC IE value in each DL SA associated with a DL CC other than the first DL CC.

8. The method of claim 7, wherein the TPC IE value is identical in each DL SA associated with the first DL CC having the DAI IE value larger than one and in each DL SA associated with the DL CC other than the first DL CC.

9. The method of claim 7, wherein the TPC IE value, in each DL SA associated with the first DL CC having the DAI IE value larger than one and in each DL SA associated with the DL CC other than the first DL CC, is an index to a resource configured to the UE by the base station through radio resource control signaling for the acknowledgement signal transmission.

10. The method of claim 7, wherein the UE determines the resource for the acknowledgement signal transmission based on CCEs used to transmit the DL SA, when the UE receives only the DL SA associated with the first DL CC having the DAI IE value equal to one.

11. The method of claim 7, wherein the UE is configured for communication over only a single UL CC and a single DL CC and the communication system uses Time Division Duplexing.

12. A User Equipment (UE) apparatus for transmitting an acknowledgement signal in an UpLink (UL) Component Carrier (CC) in response to reception of multiple DownLink (DL) Scheduling Assignments (SAs) transmitted from a base station, each of the DL SAs being associated with a respective DL CC and being conveyed through a respective set of Control Channel Elements (CCEs), the UL CC and a first DL CC establishing a communication link when the UE apparatus is configured for communication over a single UL CC and a single DL CC, the apparatus comprising:

a controller for allocating a set of resources for transmitting the acknowledgement signal, wherein the set of resources includes a first set of resources, when all of the DL SAs are received in the first DL CC, and includes a second set of resources, when at least one the DL SAs is received in a DL CC other than the first DL CC; and

a transmitter for transmitting the acknowledgement signal using a resource from the allocated set of resources.

13. The apparatus of claim 12, wherein each resource in the first set of resources is determined in a same manner.

14. The apparatus of claim 12, wherein each resource in the first set of resources is implicitly determined from at least a first CCE used for transmitting a respective DL SA.

15. The apparatus of claim 12, wherein a resource corresponding to the at least one DL SA received in the DL CC other than the first DL CC, with each DL CC having an index provided by the base station through radio resource control signaling, is determined from at least a first CCE used for transmitting the at least one DL SA and an offset derived from an index of the at least one DL CC.

16. The apparatus of claim 12, wherein each resource corresponding to each of the at least one DL SA received in each DL CC other than the first DL CC is configured to the UE by the base station through radio resource control signaling.

17. The apparatus of claim 16, wherein each resource is indexed by an information element in the at least one DL SA.

18. A User Equipment (UE) apparatus for transmitting an acknowledgement signal in an UpLink (UL) Component Carrier (CC) in response to reception of multiple DownLink (DL) Scheduling Assignments (SAs) transmitted from a base station, wherein each of the DL SAs is associated with a respective DL CC conveyed through a respective set of Control Channel Elements (CCEs) and includes a Downlink Assignment Index (DAI) Information Element (IE) for indicating a DL SA number and a Transmission Power Control (TPC) IE for adjusting an acknowledgement signal transmission power, the UL CC and a first DL CC establishing a communication link when the UE apparatus is configured for communication over a single UL CC and a single DL CC, the apparatus comprising:

a transmission power controller for adjusting the acknowledgement signal transmission power using a TPC IE value in a DL SA associated with the first DL CC having a DAI IE value equal to one;

a resource allocation controller for allocating a resource for transmitting the acknowledgement signal using a TPC IE value in each DL SA associated with the first DL CC having a DAI IE value larger than one and from a TPC IE value in each DL SA associated with a DL CC other than the first DL CC; and

a transmitter for transmitting the acknowledgement signal with an adjusted transmission power in the allocated resource.

19. The apparatus of claim 18, wherein the TPC IE value is identical in each DL SA associated with the first DL CC having the DAI IE value larger than one and in each DL SA associated with the DL CC other than the first DL CC.

20. The apparatus of claim 18, wherein the TPC IE value, in each DL SA associated with the first DL CC having the DAI IE value larger than one and in each DL SA associated with the DL CC other than the first DL CC, is an index to a resource configured to the UE by the base station through radio resource control signaling for transmitting the acknowledgement signal.

21. The apparatus of claim 18, wherein when only the DL SA associated with the first DL CC having the DAI IE value equal to one is received, the allocated resource for transmitting the acknowledgement signal is derived from CCEs used to transmit the DL SA.

22. The apparatus of claim 18, wherein communication is configured over only a single UL CC and a single DL CC and the communication system uses Time Division Duplexing.