Base station and terminal

• US 10,009,163 B2
• Filed: 04/20/2012
• Issued: 06/26/2018
• Est. Priority Date: 04/27/2011
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Shimezawa, Kazuyuki, Nogami, Toshizo, Imamura, Kimihiko, Nakashima, Daiichiro
• Primary Examiner(s): Chu, Wutchung
• Application Number:
  US14/114,143
• Publication Number:
  US 20140050190A1
• Time in Patent Office: 2,258 Days
• 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 5/0087 when data requirements change
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A base station is capable of efficiently notifying a terminal of control information. The base station communicates with the terminal using a sub-frame including a plurality of resource block pairs. The base station sets a second control channel region in the terminal through RRC signaling that is higher-layer control information, the second control channel region being a region set differently from a first control channel region in which a first control channel is to be arranged. The base station transmits control information for the terminal by mapping the control information to a second control channel that is to be arranged in the second control channel region. The first control channel region is set in the sub-frame to be specific to the base station, and the second control channel region is set in the sub-frame to be specific to the terminal in units of the resource block pairs.

Claims

1. A base station configured to communicate with a terminal in a cell using a sub-frame including a plurality of resource block pairs, the base station comprising:

a control information generator configured to generate control information for the terminal; and

a transmitter configured to transmit the control information on a second control channel mapped to a second control channel region configured to be different from a first control channel region to which a first control channel is mapped, wherein

the first control channel region is a region specific to the cell in the sub-frame;

the second control channel region is a region configured to be specific to the terminal in the sub-frame;

the terminal is configured with monitoring of the second control channel individually on a cell-by-cell basis; and

sub-frames in which the terminal monitors the second control channel are indicated by the base station apparatus using a bitmap in a radio resource control signaling, the sub-frames being units in time domain, wherein

the second control channel is transmitted using a second antenna port different from a first antenna port used for transmission of the first control channel,

the first antenna port is an antenna port used for transmission of a cell-specific reference signal that is a reference signal specific to the cell,

the second antenna port is an antenna port used for transmission of a demodulation reference signal that is associated with the second control channel,

a sequence for the demodulation reference signal is generated based on a cell ID and a scrambling ID,

the cell ID is sent by the base station, and

the scrambling ID is a pre-defined value.

2. The base station according to claim 1, wherein

the first control channel region is a region assigned based on a Physical Control Format Indicator Channel in the sub-frame, and

the second control channel region is a region extending over OFDM symbols from a first OFDM symbol to a second OFDM symbol, the first OFDM symbol being identified by a starting OFDM symbol and the second OFDM symbol being the last OFDM symbol in the sub-frame.

3. The base station according to claim 2, wherein the starting OFDM symbol is configured in the terminal through Radio Resource Control signaling.

4. The base station according to claim 2, wherein the starting OFDM symbol is determined based on the Physical Control Format Indicator Channel.

5. The base station according to claim 1, wherein the second control channel and a shared channel for the terminal are arranged in different resource block pairs.

6. A base station configured to communicate with a terminal in a cell using a sub-frame including a plurality of resource block pairs, the base station comprising:

a control information generator configured to generate control information for the terminal; and

a transmitter configured to transmit the control information on a first control channel mapped to a first control channel region or on a second control channel mapped to a second control channel region, wherein

in a case where the terminal is not configured with monitoring of the second control channel, the control information for the terminal is transmitted on the first control channel;

in a case where the terminal is configured with the monitoring of the second control channel, the control information for the terminal is transmitted on the first control channel or the second control channel;

the first control channel region is a region specific to the cell in the sub-frame, and the second control channel region is a region configured to be specific to the terminal in the sub-frame;

the terminal is configured with monitoring of the second control channel individually on a cell-by-cell basis; and

sub-frames in which the terminal monitors the second control channel are indicated by the base station apparatus using a bitmap in a radio resource control signaling, the sub-frames being units in time domain, wherein

the second control channel is transmitted using a second antenna port different from a first antenna port used for transmission of the first control channel,

the first antenna port is an antenna port used for transmission of a cell-specific reference signal that is a reference signal specific to the cell,

the second antenna port is an antenna port used for transmission of a demodulation reference signal that is associated with the second control channel,

a sequence for the demodulation reference signal is generated based on a cell ID and a scrambling ID,

the cell ID is sent by the base station, and

the scrambling ID is a pre-defined value.

7. A terminal configured to communicate with a base station in a cell using a sub-frame including a plurality of resource block pairs, the terminal comprising:

a receiver configured to monitor a second control channel mapped to a second control channel region configured to be different from a first control channel region to which a first control channel is mapped; and

a control information processor configured to process control information for the terminal that is transmitted on the second control channel, wherein

the first control channel region is a region specific to the cell in the sub-frame;

the second control channel region is a region configured to be specific to the terminal in the sub-frame;

the terminal is configured with monitoring of the second control channel individually on a cell-by-cell basis; and

sub-frames in which the terminal monitors the second control channel are indicated by the base station apparatus using a bitmap in a radio resource control signaling, the sub-frames being units in time domain, wherein

the second control channel is transmitted using a second antenna port different from a first antenna port used for transmission of the first control channel,

the first antenna port is an antenna port used for transmission of a cell-specific reference signal that is a reference signal specific to the cell,

the second antenna port is an antenna port used for transmission of a demodulation reference signal that is associated with the second control channel,

a sequence for the demodulation reference signal is generated based on a cell ID and a scrambling ID,

the cell ID is sent by the base station, and

the scrambling ID is a pre-defined value.

8. The terminal according to claim 7, wherein

the first control channel region is a region assigned based on a Physical Control Format Indicator Channel in the sub-frame, and

the second control channel region is a region extending over OFDM symbols from a first OFDM symbol to a second OFDM symbol, the first OFDM symbol being identified by a starting OFDM symbol and the second OFDM symbol being the last OFDM symbol in the sub-frame.

9. The terminal according to claim 8, wherein the starting OFDM symbol is configured in the terminal through Radio Resource Control signaling.

10. The terminal according to claim 8, wherein the starting OFDM symbol is determined based on the Physical Control Format Indicator Channel.

11. The terminal according to claim 7, wherein the second control channel and a shared channel for the terminal are arranged in different resource block pairs.

12. A terminal configured to communicate with a base station in a cell using a sub-frame including a plurality of resource block pairs, the terminal comprising:

a receiver configured to monitor a candidate of a first control channel or a candidate of a second control channel, the first control channel being mapped to a first control channel region and the second control channel being mapped to a second control channel region; and

a control information processor configured to process control information for the terminal that is transmitted on the first control channel or on the second control channel, wherein

in a case where the terminal is not configured with monitoring of the second control channel, the receiver configured to monitor the candidate of the first control channel, and the control information processor is configured to process the control information for the terminal;

in a case where the terminal is configured with the monitoring of the second control channel, the receiver configured to monitor the candidate of the first control channel and the candidate of the second control channel, and the control information processor is configured to process the control information for the terminal;

the first control channel region is a region specific to the cell in the sub-frame, and the second control channel region is a region configured to be specific to the terminal in the sub-frame;

the terminal is configured with monitoring of the second control channel individually on a cell-by-cell basis; and

sub-frames in which the terminal monitors the second control channel are indicated by the base station apparatus using a bitmap in a radio resource control signaling, the sub-frames being units in time domain, wherein

the second control channel is transmitted using a second antenna port different from a first antenna port used for transmission of the first control channel,

the first antenna port is an antenna port used for transmission of a cell-specific reference signal that is a reference signal specific to the cell,

the second antenna port is an antenna port used for transmission of a demodulation reference signal that is associated with the second control channel,

a sequence for the demodulation reference signal is generated based on a cell ID and a scrambling ID,

the cell ID is sent by the base station, and

the scrambling ID is a pre-defined value.