Control channel transmitting method, base station and terminal

• US 8,737,341 B2
• Filed: 12/19/2012
• Issued: 05/27/2014
• Est. Priority Date: 12/28/2004
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Seki, Hiroyuki
• Primary Examiner(s): Chriss, Andrew
• Assistant Examiner(s): Rivas, Salvador E
• Application Number:
  US13/720,270
• Publication Number:
  US 20130107839A1
• Time in Patent Office: 524 Days
• Field of Search: None
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0006 by adapting the transmission format
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 1/003 Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
• CPC Class Codes: H04L 1/0075 Transmission of coding parameters to receiver H04L1/0023 takes precedence
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 5/1453 of modulation type
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 72/00 Local resource management
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A terminal that includes a control channel demodulating part configured to have a control channel format notified from a base station which transmits a control channel with the use of the control channel format, selected from among a plurality of control channel formats, each including modulation scheme information, having different number of types of control parameters according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not, and demodulate the control channel received from the base station; and a data channel demodulating part configured to demodulate a data channel received from the base station with the use of a result of the demodulation of the control channel carried out by the control channel demodulating part, and when the number of bits indicating a modulation scheme selected format when the MIMO transmission is applied is greater than when the MIMO transmission is not applied.

Claims

1. A terminal comprising:

a control channel demodulating part configured to have a control channel format notified from a base station which transmits a control channel with the use of the control channel format which is selected from among a plurality of control channel formats, each including modulation scheme information, having different number of types of control parameters according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not, and demodulate the control channel received from the base station; and

a data channel demodulating part configured to demodulate a data channel received from the base station with the use of a result of the demodulation of the control channel carried out by the control channel demodulating part,

wherein a number of bits indicating a modulation scheme included in a control channel format to be selected when the MIMO transmission is applied is greater than that included in a control channel format to be selected when the MIMO transmission is not applied.

2. A terminal comprising:

a transmitting part configured to have a control channel format notified from a base station, selected from among a plurality of control channel formats, each including modulation scheme information, having different number of types of control parameters according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not, and transmit a control channel to the base station,

wherein a number of bits indicating a modulation scheme included in a control channel format to be selected when the MIMO transmission is applied is greater than that included in a control channel format to be selected when the MIMO transmission is not applied.

3. The terminal as claimed in claim 2, wherein:

the plurality of control channel formats have different variable ranges for each of the control parameters.

4. A base station comprising:

a format selecting part configured to select a control channel format from a plurality of control channel formats according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not; and

a transmitting part configured to transmit a control channel to a terminal,

wherein a number of bits indicating a modulation scheme included in a control channel format to be selected when the MIMO transmission is applied is greater than that included in a control channel format to be selected when the MIMO transmission is not applied.

5. The base station as claimed in claim 4, wherein:

the format selecting part selects the control channel format according to the number of users multiplexed in one transmission frame.