Terminal device, base station, communication system, and communication method

• US 9,832,001 B2
• Filed: 06/21/2013
• Issued: 11/28/2017
• Est. Priority Date: 06/21/2013
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Nogami, Toshizo, Aiba, Tatsushi, Suzuki, Shoichi, Shimezawa, Kazuyuki, Imamura, Kimihiko
• Primary Examiner(s): Javaid, Jamal
• Application Number:
  US14/897,260
• Publication Number:
  US 20160127106A1
• Time in Patent Office: 1,621 Days
• 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 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0096 Indication of changes in allocation
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention provides a base station, a terminal device, a communication system, and a communication method configured to efficiently specify a physical uplink control channel resource in a case that the base station notifies the terminal device of control information through an enhanced physical downlink control channel or in a case that a cell radius is small. The terminal device in communication with the base station monitors a physical downlink control channel placed in a common search space and an enhanced physical downlink control channel placed in a terminal-specific search space. Upon detecting the enhanced physical downlink control channel, the terminal device maps response information to a physical uplink control channel resource determined in response to at least an index of an element forming the detected enhanced physical downlink control channel and an individual shift amount individually configured on a per terminal device basis, and then reports the base station of the mapped response information.

Claims

1. A terminal device in communication with a base station, comprising:

downlink control channel detecting circuitry that monitors a physical downlink control channel placed in a common search space and an enhanced physical downlink control channel placed in a terminal-specific search space,

data extracting circuitry that extracts transmission data from a physical downlink shared channel related to the detected physical downlink control channel or the detected enhanced physical downlink control channel,

response information generating circuitry that generates response information responsive to the extracted transmission data,

uplink control channel generating circuitry that, in a case that the downlink control channel detecting circuitry detects the enhanced physical downlink control channel, generates a physical uplink control channel by mapping the response information to a physical uplink control channel resource determined by adding at least an individual shift amount individually configured on a per terminal device basis to an index of an element, the detected enhanced physical downlink control channel including at least the element, and

response transmitting circuitry that transmits a signal including the physical uplink control channel.

2. The terminal device according to claim 1, further comprising higher layer control information acquisition circuitry that acquires control information including a parameter indicating the individual shift amount.

3. The terminal device according to claim 2, wherein the higher layer control information acquisition circuitry acquires the control information including a parameter indicating a common shift amount commonly configured on terminal devices,

wherein in a case that the downlink control channel detecting circuitry has detected the physical downlink control channel, the uplink control channel generating circuitry generates the physical uplink control channel by mapping the response information to the physical uplink control channel resource having as an index a value resulting from adding at least the common shift amount to the index of the element forming the detected physical downlink control channel, and

in a case that the downlink control channel detecting circuitry has detected the enhanced physical downlink control channel, the uplink control channel generating circuitry generates the physical uplink control channel by mapping the response information to the physical uplink control channel resource having as an index a value resulting from adding at least the individual shift amount to the index of the element forming the detected enhanced physical downlink control channel.

4. The terminal device according to claim 1, wherein the uplink control channel generating circuitry generates the physical uplink control channel by mapping the response information to the physical uplink control channel resource determined in response to at least the index of the element forming the detected enhanced physical downlink control channel and the individual shift amount configured on a transmission port with the enhanced physical downlink control channel detected therefrom.

5. The terminal device according to claim 1, wherein upon detecting the enhanced physical downlink control channel, the downlink control channel detecting circuitry extracts a single individual shift amount specified by the detected enhanced physical downlink control channel from among a plurality of types of individual shift amounts, and

wherein in a case that the downlink control channel detecting circuitry has detected the enhanced physical downlink control channel, the uplink control channel generating circuitry generates the physical uplink control channel by mapping the response information to the physical uplink control channel resource determined by adding at least the extracted individual shift amount to the index of the element forming the enhanced physical downlink control channel.

6. A base station in communication with a terminal device, comprising:

physical control information notifying circuitry that notifies the terminal device of a physical downlink control channel placed in a common search space or an enhanced physical downlink control channel placed in a terminal-specific search space, and

response information receiving circuitry that, in a case that the physical control information notifying circuitry notifies the terminal device of the enhanced physical downlink control channel, extracts response information responsive to transmission data in a physical downlink shared channel related to the enhanced physical downlink control channel, in a physical uplink control channel resource determined by adding at least an individual shift amount individually configured on a per terminal device basis to an index of an element, the enhanced physical downlink control channel including at least the element.

7. The base station according to claim 6 further comprising higher layer control information notifying circuitry that notifies the terminal device of control information including a parameter indicating the individual shift amount.

8. The base station according to claim 7, wherein the higher layer control information notifying circuitry notifies the terminal device of the control information including a parameter indicating a common shift amount commonly configured in terminal devices, and

wherein in a case that the physical control information notifying circuitry notifies the terminal device of the physical downlink control channel, the response information receiving circuitry extracts the physical uplink control channel in the physical uplink control channel resource having as an index a value resulting from adding at least the common shift amount to the index of the element forming the physical downlink control channel, and

in a case that the physical control information notifying circuitry notifies the terminal device of the enhanced physical downlink control channel, the response information receiving circuitry extracts the physical uplink control channel in the physical uplink control channel resource having as an index a value resulting from adding at least the individual shift amount to the index of the element forming the enhanced physical downlink control channel.

9. The base station according to claim 6, wherein the response information receiving circuitry extracts the physical uplink control channel in the physical uplink control channel resource determined in response to at least the index of the element forming the enhanced physical downlink control channel and the individual shift amount configured on a transmission port with the enhanced physical downlink control channel detected therefrom.

10. The base station according to claim 6, wherein the physical control information notifying circuitry notifies the terminal device of the detected enhanced physical downlink control channel specifying a single individual shift amount from among a plurality of types of individual shift amounts, and

wherein the response information receiving circuitry extracts the physical uplink control channel in the physical uplink control channel resource determined by adding at least the specified individual shift amount to the index of the element forming the physical downlink control channel.

11. A communication method of a terminal device in communication with a base station, the communication method comprising:

monitoring a physical downlink control channel placed in a common search space and an enhanced physical downlink control channel placed in a terminal-specific search space,

extracting transmission data from a physical downlink shared channel related to the detected physical downlink control channel or the detected enhanced physical downlink control channel,

generating response information responsive to the extracted transmission data,

generating a physical uplink control channel, with the enhanced physical downlink control channel detected, by mapping the response information to a physical uplink control channel resource determined by adding at least an individual shift amount individually configured on a per terminal device basis to an index of an element, the detected enhanced physical downlink control channel including at least the element, and

transmitting a signal including the physical uplink control channel.

12. A communication method of a base station in communication with a terminal device, the communication method comprising:

notifying the terminal device of a physical downlink control channel placed in a common search space or an enhanced physical downlink control channel placed in a terminal-specific search space, and

extracting response information responsive to transmission data in a physical downlink shared channel related to the enhanced physical downlink control channel, with the enhanced physical downlink control channel notified, in a physical uplink control channel resource determined by adding at least an individual shift amount individually configured on a per terminal device basis to an index of an element, the enhanced physical downlink control channel including at least the element.