Method and device for realizing power control on a control channel

• US 8,768,396 B2
• Filed: 02/04/2008
• Issued: 07/01/2014
• Est. Priority Date: 02/07/2007
• Status: Active Grant

• Current Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Inventors: Guo, Baojuan, Gao, Xueyuan
• Primary Examiner(s): Pan, Yuwen
• Assistant Examiner(s): Woodall, Mark
• Application Number:
  US12/526,077
• Publication Number:
  US 20100179702A1
• Time in Patent Office: 2,339 Days
• Field of Search: 455/522, 455/115.1
• US Class Current: 455/522
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission

Abstract

A method and apparatus for realizing power control on a control channel including measuring the interval between the current control channel transmission and the last control channel transmission; comparing the measured interval with a preset threshold, and if the interval is larger than or equal to the preset threshold, carrying out the current control channel transmission by using the initial transmit power, or controlling the current control channel transmission by using the open loop power control and, otherwise, controlling the current control channel transmission by using the closed loop power control. When the control channel is an uplink control channel, it may be determined whether a compensation for path loss variance should be added based on the closed loop power control according to a related command, so as to enable that the power control can be provided effectively when the control channel transmission is discontinuous.

Claims

1. A method for realizing power control on a control channel, transmission of which is discontinuous resulting in a discontinuously transmitted control channel, the method comprising:

measuring an interval between a current transmission of the discontinuously transmitted control channel and a last transmission of the discontinuously transmitted control channel, wherein, the interval is a time interval;

comparing the time interval with a preset threshold to produce a comparison result, wherein the preset threshold is set by a radio network controller based on radio control channel correlation; and

determining a power control mode of the current transmission of the discontinuously transmitted control channel based on the comparison result,

wherein the determining of the power control mode of the current transmission of the discontinuously transmitted control channel based on the comparison result comprises;

carrying out the current transmission of the discontinuously transmitted control channel using an open loop power control or an initial transmission power if the time interval is larger than or equal to the preset threshold; and

otherwise, carrying out the current transmission of the discontinuously transmitted control channel using a closed loop power control, and

wherein the use of the open loop power control or the initial transmission power for the current transmission of the discontinuously transmitted control channel when the time interval is larger than or equal to the preset threshold ensures that a transmission power of the discontinuously transmitted control channel is set high enough to guarantee quality of the discontinuously transmitted control channel but also that the transmission power of the discontinuously transmitted control channel is set low enough not to interfere with other control channels.

2. The method of claim 1, wherein, the measuring of the time interval between the current transmission of the discontinuously transmitted control channel and the last transmission of the discontinuously transmitted control channel comprises recording a system frame number corresponding to the last transmission of the discontinuously transmitted control channel and a system frame number corresponding to the current transmission of the discontinuously transmitted control channel.

3. The method of claim 1, wherein the control channel is an uplink control channel.

4. The method of claim 1, wherein, when the control channel is an uplink control channel and the discontinuously transmitted control channel transmission is performed using the closed loop power control, the method control further comprises adding a compensation for path loss variance based on the closed loop power control.

5. A device for realizing power control on a control channel, transmission of which is discontinuous resulting in a discontinuously transmitted control channel, the device comprising:

an interval measuring unit, an interval comparing unit and a power control unit, wherein;

the interval measuring unit measures an interval between the current control channel transmission and the last control channel transmission, wherein, the interval is a time interval;

the interval comparing unit compares the time interval with a stored preset threshold to obtain a comparison result, wherein the preset threshold is set by a radio network controller based on a radio control channel correlation; and

the power control unit determines a power control mode of the current transmission of the discontinuously transmitted control channel based on the comparison result, wherein the power control unit;

carrying out the current transmission of the discontinuously transmitted control channel using an open loop power control or an initial transmission power if the time interval is larger than or equal to the preset threshold; and

otherwise, carrying out the current transmission of the discontinuously transmitted control channel using a closed loop power control, and

wherein the use of the open loop power control or the initial transmission power for the current transmission of the discontinuously transmitted control channel when the time interval is larger than or equal to the preset threshold ensures that a transmission power of the discontinuously transmitted control channel is set high enough to guarantee quality of the discontinuously transmitted control channel but also that the transmission power of the discontinuously transmitted control channel is set low enough not to interfere with other control channels.

6. The device of claim 5, further comprising a threshold setting unit that dynamically adjusts the threshold and inputs an adjustment result to the interval comparing unit,

wherein the interval comparing unit stores the adjustment result.

7. The device of claim 5, further comprising a path-loss measuring unit that measures path loss information of a radio channel and inputs a compensation for path loss variance into the power control unit,

wherein the power control unit adjusts the transmit power of the discontinuously transmitted control channel based on the compensation for path loss variance.

8. The device of claim 7, further comprising a path-loss adding control unit that sets whether the compensation for path loss variance is input into the power control unit based on the closed loop power control when the power control unit carries out the discontinuously transmitted control channel transmission using the closed loop power control.