Control channel transmitting method, receiving method, base station and terminal

• US 8,374,189 B2
• Filed: 06/21/2007
• Issued: 02/12/2013
• 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:
  US11/812,789
• Publication Number:
  US 20070248041A1
• Time in Patent Office: 2,063 Days
• Field of Search: None
• US Class Current: 370/431
• 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 step of selecting one control channel format from among a plurality of control channel formats having different information amounts according to a predetermined condition; and a step of transmitting a control channel with the use of the thus-selected control channel format are carried out.

Claims

1. A control channel transmitting method, comprising:

selecting one control channel format from among a plurality of control channel formats, each including modulation scheme information, according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not; and

transmitting a control channel with the use of the selected control channel format,

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. The control channel transmitting method as claimed in claim 1, wherein:

the control channel format is selected according to the number of users multiplexed in one transmission frame.

3. The control channel transmitting method as claimed in claim 1, wherein:

the control channel format is selected according to a transmission/reception function mounted in a terminal.

4. The control channel transmitting method as claimed in claim 1, wherein:

the control channel format is selected according to QoS of a data channel transmitted between a base station and a terminal.

5. The control channel transmitting method as claimed in claim 1, wherein:

the control channel format is selected according to propagation path quality between a base station and a terminal.

6. The control channel transmitting method as claimed in claim 1, wherein:

the control channel is transmitted, wherein the control channel is multiplexed in a time domain.

7. The control channel transmitting method as claimed in claim 1, wherein:

the control channel is transmitted, wherein the control channel is multiplexed in a frequency domain.

8. The control channel transmitting method as claimed in claim 1, wherein:

the control channel is transmitted, wherein the control channel is multiplexed in a code domain.

9. The control channel transmitting method as claimed in claim 1, wherein:

the selected control channel format is notified from a base station to a terminal by means of signaling carried out at a time of call connection or every predetermined time interval.

10. The control channel transmitting method as claimed in claim 1, wherein:

the number of control channels multiplexed in one frame is reduced according to the selected control channel format and a multiplexing method, and, the number of data channels to be multiplexed in the one frame is increased by an amount by which the number of control channels to be multiplexed in the one frame is reduced.

16. The control channel transmitting method as claimed in claim 1, wherein:

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

11. A base station comprising:

a format selecting part configured to select a control channel format from among a plurality of control channel formats, each including modulation scheme information, 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 with the use of the selected control channel format,

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.

12. The base station as claimed in claim 11, wherein:

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

13. The base station as claimed in claim 11, wherein:

the format selecting part selects the control channel format according to a transmission/reception function mounted in the terminal.

14. 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, according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not, and demodulate the control channel received from the base station with the use of the notified control channel format; 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.

15. 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, according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not, and transmit a control channel to the base station with the use of the notified control channel format,

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.

17. A receiving method performed by a terminal, comprising:

receiving a control channel transmitted by a base station using a channel format determined among a plurality of control channel formats, each including modulation scheme information, according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not,

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.

18. A method used in a communication system including a base station and a terminal, the method comprising:

selecting, by the base station, one control channel format from among a plurality of control channel formats, each including modulation scheme information, according to whether Multiple Input Multiple Output (MIMO) transmission is applied or not;

transmitting a control channel from the base station to the terminal with the use of the selected control channel format, and

receiving the control channel by the 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.