Wireless communication terminal, base station device, and resource allocation method

• US 10,356,774 B2
• Filed: 04/25/2018
• Issued: 07/16/2019
• Est. Priority Date: 09/27/2012
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Sun Patent Trust
• Inventors: Takeda, Kazuki, Suzuki, Hidetoshi, Horiuchi, Ayako, Oizumi, Toru
• Primary Examiner(s): Chau, Peter P
• Application Number:
  US15/963,008
• Publication Number:
  US 20180242297A1
• Time in Patent Office: 447 Days
• CPC Class Codes: H04L 1/1854 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• 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 5/0096 Indication of changes in allocation
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A wireless communication terminal capable of increasing the utilization efficiency of ACK/NACK resources and suppressing unnecessary PUSCH band reduction while avoiding ACK/NACK collision. The wireless communication terminal has a configuration provided with: a reception unit for receiving a control signal including ARI via an E-PDCCH set from among one or a plurality of E-PDCCH sets; a control unit for determining an offset value indicated by the ARI on the basis of whether or not a resource region that may be taken by a dynamic ACK/NACK resource corresponding to the E-PDCCH set that has received the control signal and a resource region that may be taken by a dynamic ACK/NACK resource corresponding to another E-PDCCH set overlap, and imparting an offset to the ACK/NACK resource according to the value of the ARI; and a transmission unit for transmitting the ACK/NACK signal using the determined ACK/NACK resource.

Claims

1. An integrated circuit to control a process of a radio communication terminal, the integrated circuit comprising circuitry which, in operation, controls the process which includes:

receiving control information including an ACK/NACK Resource Indicator (ARI) via an Enhanced Physical Downlink Control Channel (E-PDCCH) detected in an E-PDCCH set;

determining an ACK/NACK resource offset value based on the ARI;

determining an ACK/NACK resource for transmitting an ACK/NACK signal based on the determined ACK/NACK resource offset value; and

transmitting the ACK/NACK signal using the determined ACK/NACK resource,

wherein the ARI has two bits and the ACK/NACK resource offset value takes one of four values based on the two bits including a first value associated with 0, a second value associated with a fixed offset, and third and fourth values associated with dynamic offsets that depend on a total number of Enhanced Control Channel Elements (ECCEs) included in the E-PDCCH set in which the E-PDCCH including the ARI is detected.

2. The integrated circuit according to claim 1, wherein at least one of the third and fourth values is a negative value.

3. The integrated circuit according to claim 2, wherein the negative ACK/NACK resource offset value facilitates reducing an ACK/NACK resource overhead in resources of a Physical Uplink Shared Channel (PUSCH).

4. The integrated circuit according to claim 1, wherein the ARI has more than two bits.

5. The integrated circuit according to claim 1, wherein the process comprises:

determining the ACK/NACK resource offset value according to whether or not there is an overlap between a first resource region of a dynamic ACK/NACK resource for the E-PDCCH set in which the E-PDCCH is detected and a second resource region of a dynamic ACK/NACK resource for another E-PDCCH set.

6. The integrated circuit according to claim 5, wherein the process comprises:

when there is the overlap, determining the ACK/NACK resource offset value to correspond to the first resource region or to a resource region obtained by adding a constant to the first resource region.

7. The integrated circuit according to claim 5, wherein the process comprises:

when there is the overlap, determining the ACK/NACK resource offset value according to a number of overlapping resources between the first and second resource regions.

8. The integrated circuit according to claim 5, wherein the process comprises:

when there is the overlap, determining the ACK/NACK resource offset value according to an overlapping size of the first and second resource regions.

9. The integrated circuit according to claim 1, comprising:

at least one input coupled to the circuitry, wherein the at least one input, in operation, inputs data; and

at least one output coupled to the circuitry, wherein the at least one output, in operation, outputs data.

10. An integrated circuit comprising:

reception circuitry which, in operation, controls reception of control information including an ACK/NACK Resource Indicator (ARI) via an Enhanced Physical Downlink Control Channel (E-PDCCH) detected in an E-PDCCH set;

control circuitry which, in operation, determines an ACK/NACK resource offset value based on the ARI and determines an ACK/NACK resource for transmitting an ACK/NACK signal based on the determined ACK/NACK resource offset value; and

transmission circuitry which, in operation, controls transmission of the ACK/NACK signal using the determined ACK/NACK resource,

wherein the ARI has two bits and the ACK/NACK resource offset value takes one of four values based on the two bits including a first value associated with 0, a second value associated with a fixed offset, and third and fourth values associated with dynamic offsets that depend on a total number of Enhanced Control Channel Elements (ECCEs) included in the E-PDCCH set in which the E-PDCCH including the ARI is detected.

11. The integrated circuit according to claim 10, wherein at least one of the third and fourth values is a negative value.

12. The integrated circuit according to claim 11, wherein the negative ACK/NACK resource offset value facilitates reducing an ACK/NACK resource overhead in resources of a Physical Uplink Shared Channel (PUSCH).

13. The integrated circuit according to claim 10, wherein the ARI has more than two bits.

14. The integrated circuit according to claim 10, wherein

the control circuitry, in operation, determines the ACK/NACK resource offset value depending on whether or not there is an overlap between a first resource region of a dynamic ACK/NACK resource for the E-PDCCH set in which the E-PDCCH is detected and a second resource region of a dynamic ACK/NACK resource for another E-PDCCH set.

15. The integrated circuit according to claim 14, wherein, when there is the overlap, the control circuitry determines the ACK/NACK resource offset value to correspond to the first resource region or to a resource region obtained by adding a constant to the first resource region.

16. The integrated circuit according to claim 14, wherein, when there is the overlap, the control circuitry determines the ACK/NACK resource offset value according to a number of overlapping resources between the first and second resource regions.

17. The integrated circuit according to claim 14, wherein, when there is the overlap, the control circuitry determines the ACK/NACK resource offset value based on a difference between a first ACK/NACK resource offset value indicated by a higher layer for the E-PDCCH set in which the E-PDCCH is detected and a second ACK/NACK resource offset value indicated by the higher layer for the other E-PDCCH set.

18. The integrated circuit according to claim 14, wherein, when there is the overlap, the control circuitry determines the ACK/NACK resource offset value according to an overlapping size of the first and second resource regions.

19. The integrated circuit according to claim 14, wherein, when there is an overlap between the first resource region and a third resource region of a dynamic ACK/NACK resource for a Physical Downlink Control Channel (PDCCH), the control circuitry determines the ACK/NACK resource offset value according to a size of the third resource region.