Terminal, base station, integrated circuit, and communication method

Patent metadata

Field	Value
Publication number	US-10779265-B2
Application number	US-201414910750-A
Country	US
Kind code	B2
Filing date	Aug 6, 2014
Priority date	Aug 9, 2013
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

A search space of a control channel which is monitored by a terminal is determined based on a first uplink-downlink configuration specific to a base station, a second uplink-downlink configuration specific to a terminal, and one or more EPDCCH subframe configuration, for each subframe. A scrambling sequence parameter which corresponds to the search space of the control channel and is used in scrambling of the control channel is switched. The terminal switches the scrambling sequence parameter, corresponding to the search space and a subframe configuration, and the terminal receives a DMRS and descrambles an EPDCCH by using the switched scrambling sequence parameter.

First claim

The invention claimed is:

1. A user equipment comprising:
a higher layer processor that acquires user equipment specific information which identifies a first subframe where a physical downlink control channel (PDCCH) with downlink control information (DCI) format 1C with a cyclic redundancy check (CRC) scrambled by eIMTA-RNTI is to be monitored, and
receiver circuitry that decodes the PDCCH in the first subframe, wherein
the receiver circuitry receives a time division duplex configuration (TDD-Config) parameter for a serving cell and a downlink reference uplink-downlink configuration for the serving cell,
the downlink reference uplink-downlink configuration is a configuration included in a downlink reference uplink-downlink configuration set, the downlink reference uplink-downlink configuration set corresponding to a serving cell uplink-downlink configuration indicated by the TDD-Config parameter,
the PDCCH carries another uplink-downlink configuration for the serving cell,
the serving cell uplink-downlink configuration indicates a position of a downlink subframe, a position of a special subframe, and a position of an uplink subframe among ten subframes in one radio frame,
the another uplink-downlink configuration identifies a second subframe as one of a downlink subframe, an uplink subframe, or a special subframe among ten subframes in one radio frame,
the another uplink-downlink configuration indicates a position of a downlink subframe, a position of a special subframe, and a position of an uplink subframe among ten subframes in one radio frame,
for any second subframes indicated as an uplink subframe or a special subframe by the downlink reference uplink-downlink configuration which is configured by dedicated RRC signaling, the PDCCH is configured such that the another uplink-downlink configuration identifies each of the any second subframes as other than a downlink subframe,
the downlink reference uplink-downlink configuration identifies the second subframe as one of a downlink subframe, an uplink subframe, or a special subframe among ten subframes in one radio frame,
and
each subframe has a length of 1 ms.

2. The user equipment according to claim 1 , wherein
the first subframe where the receiver monitors the PDCCH on one radio frame is configured by bitmap information.

3. The user equipment according to claim 2 , wherein
in a case of a time division duplex (TDD) as a primary cell, the first subframe where the receiver monitors the PDCCH is indicated by a first uplink-downlink configuration in system information block type 1 as a downlink subframe.

4. The user equipment according to claim 3 , wherein
the first subframe where the receiver monitors the PDCCH corresponds to a bit whose value is 1 within the bitmap information.

5. The user equipment according to claim 3 , wherein
a second subframe where the receiver does not monitor the PDCCH corresponds to a bit whose value is 0 within the bitmap information or is indicated by the first uplink-downlink configuration in the system information block type 1 as an uplink subframe.

6. The user equipment according to claim 1 , wherein
the eIMTA-RNTI is configured by dedicated RRC signaling.

7. The user equipment according to claim 1 , wherein
the receiver is configured to receive the PDCCH which identifies a subframe, which is indicated as an uplink subframe by a first uplink-downlink configuration in system information block type 1, as an uplink subframe or a downlink subframe by the uplink-downlink configuration carried by the PDCCH, and
the receiver is configured to not receive the PDCCH which identifies a subframe, which is indicated as a downlink subframe or a special subframe by the first uplink-downlink configuration in the system information block type 1, as an uplink subframe by the uplink-downlink configuration carried by the PDCCH.

8. The user equipment according to claim 1 , wherein
the downlink reference uplink-downlink configuration is configured among a set of uplink-downlink configurations restricted based on an uplink reference uplink-downlink configuration.

9. The user equipment according to claim 1 , wherein
the downlink reference uplink-downlink configuration is configured to a serving cell through dedicated RRC signaling.

10. A base station apparatus comprising:
a higher layer processor that acquires user equipment specific information which identifies a first subframe where a physical downlink control channel (PDCCH) with downlink control information (DCI) format 1C with a cyclic redundancy check (CRC) scrambled by eIMTA-RNTI is to be transmitted, and
transmitter circuitry that encodes the PDCCH in the first subframe, wherein
the transmitter circuitry transmits a time division duplex configuration (TDD-Config) parameter for a serving cell and a downlink reference uplink-downlink configuration for the serving cell,
the downlink reference uplink-downlink configuration is a configuration included in a downlink reference uplink-downlink configuration set the downlink reference u link-downlink configuration set corresponding to a serving cell uplink-downlink configuration indicated by the TDD-Config parameter,
the PDCCH carries another uplink-downlink configuration for the serving cell,
the serving cell uplink-downlink configuration indicates a position of a downlink subframe, a position of a special subframe, and a position of an uplink subframe among ten subframes in one radio frame,
the another uplink-downlink configuration identifies a second subframe as one of a downlink subframe, an uplink subframe, or a special subframe among ten subframes in one radio frame,
the another uplink-downlink configuration indicates a position of a downlink subframe, a position of a special subframe, and a position of an uplink subframe among ten subframes in one radio frame,
for any second subframes indicated as an uplink subframe or a special subframe by the downlink reference uplink-downlink configuration which is configured by dedicated RRC signaling, the PDCCH is configured such that the another uplink-downlink configuration identifies each of the any second subframes as other than a downlink subframe,
the downlink reference uplink-downlink configuration identifies the second subframe as one of a downlink subframe, an uplink subframe, or a special subframe among ten subframes in one radio frame,
and
each subframe has a length of 1 ms.

11. The base station apparatus according to claim 10 , wherein
the first subframe where the transmitter transmits the PDCCH on one radio frame is configured by bitmap information.

12. The base station apparatus according to claim 11 , wherein
in a case of a time division duplex (TDD) as a primary cell, the first subframe where the transmitter transmits the PDCCH is indicated by a first uplink-downlink configuration in system information block type 1 as a downlink subframe.

13. The base station apparatus according to claim 12 , wherein
the first subframe where the transmitter transmits the PDCCH corresponds to a bit whose value is 1 within the bitmap information.

14. The base station apparatus according to claim 12 , wherein
a second subframe where the transmitter does not transmit the PDCCH corresponds to a bit whose value is 0 within the bitmap information or is indicated by the first uplink-downlink configuration in the system information block type 1 as an uplink subframe.

15. The base station apparatus according to claim 10 , wherein
the eIMTA-RNTI is configured by dedicated RRC signaling.

16. The base station apparatus according to claim 10 , wherein

Assignees

• Sharp Kk

Inventors

• Kusashima Naoki
• Shimezawa Kazuyuki
• Nogami Toshizo
• Suzuki Shoichi
• Imamura Kimihiko
• Ruiz Delgado Alvaro

Classifications

• H04W72/23 Primary

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0053 Primary

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L5/1469

  using time-sharing · CPC title

• H04W72/042 Primary

  Electricity · mapped topic