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

• US 10,674,502 B2
• Filed: 06/04/2019
• Issued: 06/02/2020
• 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:
  US16/431,477
• Publication Number:
  US 20190289580A1
• Time in Patent Office: 364 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. A radio communication apparatus comprising:

a transmitter which, in operation, transmits control information including an ACK/NACK Resource Indicator (ARI) via an Enhanced Physical Downlink Control Channel (E-PDCCH) in an E-PDCCH set; and

a receiver which, in operation, receives an ACK/NACK signal using an ACK/NACK resource, wherein the ACK/NACK resource depends on an ACK/NACK resource offset value and the ACK/NACK resource offset value depends on the ARI,

wherein the ARI has at least two bits and the ACK/NACK resource offset value takes one of at least 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 transmitted.

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

3. The radio communication apparatus 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 radio communication apparatus according to claim 1, wherein the ARI has more than two bits.

5. The radio communication apparatus according to claim 1, which is a base station.

6. A radio communication method comprising:

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

receiving an ACK/NACK signal using an ACK/NACK resource, wherein the ACK/NACK resource depends on an ACK/NACK resource offset value and the ACK/NACK resource offset value depends on the ARI,

wherein the ARI has at least two bits and the ACK/NACK resource offset value takes one of at least 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 transmitted.

7. The radio communication method according to claim 6, wherein at least one of the third and fourth values is a negative value.

8. The radio communication method according to claim 7, wherein the negative ACK/NACK resource offset value facilitates reducing an ACK/NACK resource overhead in resources of a Physical Uplink Shared Channel (PUSCH).

9. The radio communication method according to claim 6, wherein the ARI has more than two bits.

10. The radio communication method according claim 6, which is implemented by a base station.