TERMINAL DEVICE, BASE STATION, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD

• US 20160127106A1
• Filed: 06/21/2013
• Published: 05/05/2016
• 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
• Granted Patent: US 9,832,001 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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:

a downlink control channel detecting unit configured to monitor 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,

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

a response information generating unit configured to generate response information responsive to the extracted transmission data,

an uplink control channel generating unit, in a case that the downlink control channel detecting unit has detected the enhanced physical downlink control channel, configured to generate a physical uplink control channel by mapping the 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

a response transmitting unit configured to transmit a signal including the physical uplink control channel.

2. The terminal device according to claim 1, wherein the uplink control channel generating unit generates the physical uplink control channel by mapping the response information to the physical uplink control channel resource determined by adding at least the individual shift amount to the index of the element forming the detected enhanced physical downlink control channel.

3. The terminal device according to claim 1 further comprises a higher layer control information acquisition unit configured to acquire control information including a parameter indicating the individual shift amount.

4. The terminal device according to claim 3, wherein the higher layer control information acquisition unit is configured to acquire the control information including a parameter indicating a common shift amount commonly configured on terminal devices,

wherein if the downlink control channel detecting unit has detected the physical downlink control channel, the uplink control channel generating unit 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 if the downlink control channel detecting unit has detected the enhanced physical downlink control channel, the uplink control channel generating unit 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.

5. The terminal device according to claim 1, wherein the uplink control channel generating unit 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.

6. The terminal device according to claim 1, wherein upon detecting the enhanced physical downlink control channel, the downlink control channel detecting unit 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 unit has detected the enhanced physical downlink control channel, the uplink control channel generating unit 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.

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

a physical control information notifying unit configured to notify 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

a response information receiving unit, in a case that the physical control information notifying unit notifies the terminal device of the enhanced physical downlink control channel, configured to extract a physical uplink control channel mapped to 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 in response to at least an index of an element forming the enhanced physical downlink control channel and an individual shift amount individually configured on a per terminal device basis.

8. The base station according to claim 7, wherein in a case that the physical control information notifying unit notifies the terminal device of the enhanced physical downlink control channel, the response information receiving unit extracts the physical uplink control channel in the physical uplink control channel resource determined by 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 7 further comprising a higher layer control information notifying unit configured to notify the terminal device of control information including a parameter indicating the individual shift amount.

10. The base station according to claim 9, wherein the higher layer control information notifying unit notifies the terminal device of the control information including a parameter indicating a common shift amount commonly configured in terminal devices, and

wherein if the physical control information notifying unit notifies the terminal device of the physical downlink control channel, the response information receiving unit 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 if the physical control information notifying unit notifies the terminal device of the enhanced physical downlink control channel, the response information receiving unit 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.

11. The base station according to claim 7, wherein the response information receiving unit 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.

12. The base station according to claim 7, wherein the physical control information notifying unit 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 unit 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.

13. (canceled)

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

a step of 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,

a step of 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,

a step of generating response information responsive to the extracted transmission data,

a step of 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 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

a step of transmitting a signal including the physical uplink control channel.

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

a step of 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

a step of extracting a physical uplink control channel mapped to 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 in response to at least an index of an element forming the enhanced physical downlink control channel and an individual shift amount individually configured on a per terminal device basis.