Abstract:
A method, an apparatus, and a system for controlling a carrier Power Amplifier (PA) of a Base Station (BS) in a network communication field are disclosed. The method includes: obtaining power control information of the carrier PA at a next timeslot; and adjusting working voltage of the carrier PA at the next timeslot according to the power control information. An apparatus and a system for controlling a carrier PA of a BS are also disclosed. The method, apparatus, and system can reduce energy consumption of the BS and improve energy efficiency of the BS.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 13/217,733, filed on Aug. 25, 2011, which is a continuation of International Application No. PCT/CN2010/070552, filed on Feb. 5, 2010. The International Application claims priority to Chinese Patent Application No. 200910078367.4, filed on Feb. 26, 2009. The afore-mentioned patent applications are hereby incorporated by reference in their entireties. 
    
    
     FIELD OF THE INVENTION 
     Embodiments of the present invention relate to the communication field, and in particular, to a method, an apparatus, and a system for controlling a carrier Power Amplifier (PA) of a Base Station (BS). 
     BACKGROUND OF THE INVENTION 
     The Global System for Mobile Communications (GSM) network provides the widest coverage across the globe, and improving energy efficiency of the GSM network is critical to sustainable development of the GSM network. To reduce the energy consumption of a GSM BS, a method for controlling power of a GSM BS is provided in the prior art. This method detects whether each timeslot is occupied. When a timeslot is idle, a PA control unit outputs a low level to the grid voltage of the PA, and therefore, the PA works in the cutoff zone at the idle timeslot, namely, the PA is cut off and the static power consumption of the PA is zero. In this way, the energy consumption of the idle GSM BS is reduced. 
     In the prior art, the working state of the PA is adjusted by controlling the grid voltage of the PA, and the energy consumption of a GSM BS is reduced when the timeslots of the GSM BS are idle; however, when the timeslots of the GSM BS are occupied, it is impossible to improve the energy efficiency of the GSM BS or reduce the energy consumption of the GSM BS. 
     SUMMARY OF THE INVENTION 
     According to one aspect, an embodiment of the present invention provides a method for controlling a carrier PA of a BS, where the method includes: 
     obtaining power control information of the carrier PA at a next timeslot; and 
     adjusting working voltage of the carrier PA at the next timeslot according to the power control information. 
     According to another aspect, an embodiment of the present invention provides an apparatus for controlling a carrier PA of a BS, where the apparatus includes: 
     an obtaining unit, configured to obtain power control information of the carrier PA at a next timeslot; and 
     an adjusting unit, configured to adjust working voltage of the carrier PA at the next timeslot according to the power control information. 
     According to still another aspect, an embodiment of the present invention provides a BS system, including the foregoing apparatus for controlling the carrier PA of the BS. 
     It can be known from the foregoing technical solutions that, the power control information at the next timeslot is obtained as a basis for controlling the working voltage of the PA at the next timeslot. Therefore, the working voltage of the PA may be adjusted according to the power control information, which reduces the energy consumption of the BS and improves the energy efficiency of the BS. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a flowchart of a method for controlling a carrier PA of a BS according to an embodiment of the present invention; 
         FIG. 2  is a flowchart of a method for controlling a carrier PA of a BS according to another embodiment of the present invention; 
         FIG. 3  is a flowchart of a method for controlling a carrier PA of a BS according to still another embodiment of the present invention; and 
         FIG. 4  is a structural diagram of an apparatus for controlling a carrier PA of a BS according to an embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
     An embodiment of the present invention provides a method for controlling a carrier PA of a BS. The method includes: obtaining power control information of the carrier PA at a next timeslot; and controlling working voltage of the carrier PA at the next timeslot according to the power control information. With this method, the power control information at the next timeslot is obtained as a basis for controlling the working voltage of the carrier PA at the next timeslot. Therefore, the working voltage of the carrier PA may be adjusted according to the power control information, which reduces the energy consumption of the BS and improves the energy efficiency of the BS. 
     To make the technical solutions of the embodiments of the present invention clearer, the following describes the embodiments of the present invention in detail with reference to the accompanying drawings. 
     As shown in  FIG. 1 , an embodiment of the present invention provides a method for controlling a carrier PA of a BS. The method includes the following steps: 
     Step  11 : Obtain power control information of the carrier PA at a next timeslot. 
     This step may include: obtaining power control information of the carrier PA at the next timeslot from a baseband processing unit. If a single carrier is configured for this carrier PA, the power control information may include: output power of the carrier, channel modulation type, and PA switch. If multiple carriers are configured for this carrier PA, the power control information may include: output power of each carrier, channel modulation type corresponding to each carrier, PA switch of each carrier, and the number of carriers in the channel. 
     Step  12 : Control working voltage of the carrier PA at the next timeslot according to the power control information. 
     In this embodiment, the working voltage of the carrier PA may be the drain working voltage of the carrier PA. 
     This step may include: calculating the working voltage of the carrier PA at the next timeslot according to the power control information, and then adjusting the working voltage of the PA to the calculated working voltage upon arrival of the next timeslot. For example, the working voltage of the carrier PA is adjusted in the interval between the current timeslot and the next timeslot. Certainly, in practice, the adjustment of the working voltage of the carrier PA may be triggered by a timeslot synchronization signal. 
     Optionally, the step of calculating the working voltage of the carrier PA at the next timeslot according to the power control information may include: (a) calculating the output power of the carrier PA at the next timeslot according to the obtained power control information of the next timeslot, where the detailed calculation method may be: if a single carrier is configured for the carrier PA, calculating the output power of the carrier according to the power control information of the carrier PA, and using the output power of the carrier as the output power of the carrier PA at the next timeslot; or if multiple carriers are configured for the carrier PA, calculating the output power of each carrier according to the power control information of the carrier PA, and using the sum of output power of all carriers as the output power of the carrier PA at the next timeslot; (b) comparing the output power of the carrier PA with a power gain curve of the carrier PA (namely, a curve between the output power and the power gain under different working voltage) to obtain the working voltage corresponding to the output power of the carrier PA at the next timeslot, where the carrier PA works in a linear amplification zone under the working voltage of the next timeslot. 
     Preferably, when the output power of the PA fulfills the carrier requirements, lower PA working voltage that enables the PA to work in the linear amplification zone may be selected as working voltage at the next timeslot. In this way, the carrier PA can achieve high efficiency. 
     With the method provided in this embodiment, the working voltage of the carrier PA at the next timeslot is controlled according to the obtained power control information of the carrier PA at the next timeslot. For example, when the next timeslot of the carrier PA of the BS is idle, the working voltage of the carrier PA at the next timeslot is zero, the carrier PA is cut off, and the static power consumption is zero; when the next timeslot of the carrier PA of the BS is occupied, appropriate working voltage of the carrier PA at the next timeslot may be selected to achieve higher efficiency of the PA. 
     In this embodiment, the working voltage of the carrier PA of the BS at the next timeslot is adjusted, which may achieve higher efficiency of the PA, reduce energy consumption of the BS, and improve the energy efficiency of the BS. Moreover, with the method provided in this embodiment, the supply voltage of the PA may change in the interval between the current timeslot and the next timeslot, and therefore, the working voltage of the PA changes without affecting the Radio Frequency (RF) indexes output by the PA. 
     Another embodiment of the present invention provides a method for controlling a carrier PA of a BS. The implementation scenario of this embodiment is: A dual power supply switching method is used to adjust the voltage of the carrier PA, and it is assumed that the voltage of the PA at the current timeslot is U 1  and that the working voltage of the PA at the next timeslot is U 2 . As shown in  FIG. 2 , the method includes the following steps: 
     Step  21 : Obtain power control information of the carrier PA at a next timeslot. 
     The power control information in this step may include: output power of the carrier, channel modulation type, and PA switch. 
     Step  22 : Obtain the working voltage of the carrier PA at the next timeslot according to the obtained power control information. 
     For the detailed method for obtaining the working voltage of the carrier PA at the next timeslot, refer to the relevant description in step  12 , which is not repeatedly described here. 
     Step  23 : Use a dual power supply switching method to switch the working voltage of the carrier PA at the current timeslot to the PA working voltage at the next timeslot, where the switching occurs in the interval between the current timeslot and the next timeslot. 
     The dual power supply switching method in step  23  may be: Two power supplies are set in the carrier of the BS, and each power supply adjusts the voltage separately; if power supply  1  supplies power to the carrier PA at the current timeslot and the supply voltage is U 1 , the supply voltage of power supply  2  is adjusted to U 2 , and the power supply switch is enabled to switch the power supply of the carrier PA to power supply  2  in the interval between the current timeslot and the next timeslot; if power supply  2  supplies power to the carrier PA at the current timeslot and the supply voltage is U 1 , the supply voltage of power supply  1  is adjusted to U 2 , and the power supply switch is enabled to switch the power supply of the carrier PA to power supply  1  in the interval between the current timeslot and the next timeslot. 
     With the method provided in this embodiment, the working voltage of the power supply of the PA at the next timeslot is controlled according to the obtained control power information of the next timeslot, and a dual power supply switching method is used to ensure that the PA of the BS employs the working voltage of the next timeslot. Therefore, the power consumption of the BS is reduced, and the energy efficiency of the BS is improved. Moreover, with the method provided in this embodiment, the working voltage of the PA changes in the interval between the current timeslot and the next timeslot, and therefore, the working voltage of the PA changes without affecting the indexes output by the carrier PA. 
     An embodiment of the present invention also provides a method for controlling a carrier PA of a BS. The implementation scenario of this embodiment is: A Pulse-Width Modulation (PWM) method is used to adjust the voltage, namely, the voltage regulation speed of a single power supply is quickened to meet the requirement for timeslot-level voltage regulation; and it is assumed that the voltage of the PA at the current timeslot is U 1  and that the working voltage of the PA at the next timeslot is U 2 . As shown in  FIG. 3 , the method includes the following steps: 
     Steps  31  to  32  are the same as steps  21  to  22 . 
     Step  33 : Use a PWM method to adjust the supply voltage of the PA at the current timeslot to the working voltage at the next timeslot, where the adjustment occurs in the interval between the current timeslot and the next timeslot. 
     Supposing the duty ratio of the PWM control signal corresponding to the supply voltage (U 1 ) of the PA at the current timeslot is PWM 1 , and the duty ratio of the PWM control signal corresponding to the working voltage (U 2 ) of the PA at the next timeslot is PWM 2 , the PWM method in step  33  may is: switching the duty ratio of the PWM control signal of the power supply of the carrier PA from PWM 1  to PWM 2 . 
     With the method provided in this embodiment, the working voltage of the power supply of the PA at the next timeslot is controlled according to the obtained control power information of the next timeslot, and a PWM method is used to ensure that the carrier PA of the BS employs the working voltage of the next timeslot. Therefore, the power consumption of the BS is reduced, and the energy efficiency of the BS is improved. Moreover, with the method provided in this embodiment, the working voltage of the PA changes in the interval between the current timeslot and the next timeslot, and therefore, the working voltage of the PA changes without affecting the indexes output by the carrier PA. 
     An embodiment of the present invention also provides an apparatus for controlling a carrier PA of a BS. As shown in  FIG. 4 , the apparatus includes: an obtaining unit  41 , configured to obtain power control information of the carrier PA at a next timeslot; and an adjusting unit  42 , configured to adjust working voltage of the carrier PA at the next timeslot according to the power control information. 
     Optionally, the adjusting unit  42  may include: 
     a calculating module  421 , configured to calculate the working voltage of the carrier PA at the next timeslot according to the power control information; and 
     an adjusting module  422 , configured to adjust the working voltage of the carrier PA to the calculated working voltage at the next timeslot in the interval between the current timeslot and the next timeslot. 
     Optionally, the calculating module  421  may include: 
     a power calculating submodule  4211 , configured to calculate the output power of the carrier at the next timeslot according to the power control information if a single carrier is configured for the carrier PA, and use the calculated output power as the output power of the carrier PA at the next timeslot; or configured to calculate the output power of each carrier at the next timeslot according to the power control information if multiple carriers are configured for the carrier PA, and use the sum of output power of all carriers at the next timeslot as the output power of the carrier PA at the next timeslot; and 
     a voltage calculating submodule  4212 , configured to: compare the output power of the carrier PA with the power gain curve of the carrier PA to obtain the working voltage corresponding to the output power of the carrier PA at the next timeslot, and use this working voltage as the working voltage of the carrier PA at the next timeslot. 
     Optionally, the adjusting module  422  may include: 
     a switching submodule  4221 , configured to switch the working voltage of the carrier PA to the working voltage at the next timeslot in the interval between the current timeslot and the next timeslot by using a dual power supply switching method. 
     Or, the adjusting module  422  may include: 
     a PWM submodule  4222 , configured to adjust the working voltage of the carrier PA to the working voltage at the next timeslot in the interval between the current timeslot and the next timeslot by using a PWM method. 
     The foregoing embodiment is applicable not only to GSM BSs, but also to BSs of other standards such as Wideband Code Division Multiple Access (WCDMA) and Time Division-Synchronous Code Division Multiple Access (TD-SCDMA). 
     With the apparatus provided in this embodiment, after the obtaining module  41  obtains the power control information of the carrier PA at the next timeslot, the adjusting unit  42  controls the working voltage of the carrier PA at the next timeslot according to the power control information. Therefore, the working voltage of the carrier PA of the BS at the next timeslot is ensured, the power consumption of the BS is reduced, and the power efficiency of the BS is improved. Moreover, the adjusting module  422  changes the supply voltage of the PA in the interval between the current timeslot and the next timeslot, and therefore, the working voltage of the PA changes without affecting the indexes output by the PA. 
     An embodiment of the present invention also provides a BS system. The BS system includes an apparatus for controlling the carrier PA. The apparatus for controlling the carrier PA includes: an obtaining unit, configured to obtain power control information of the carrier PA at a next timeslot; and an adjusting unit, configured to adjust working voltage of the carrier PA at the next timeslot according to the power control information. 
     With the system provided in this embodiment, the obtaining unit in the apparatus for controlling the carrier PA obtains the power control information of the carrier PA at the next timeslot, and the adjusting unit controls the working voltage of the carrier PA at the next timeslot according to the power control information. Therefore, the working voltage of the carrier PA of the BS at the next timeslot is ensured, the power consumption of the BS is reduced, and the power efficiency of the BS is improved. 
     In the embodiments of the present invention, the word “obtain” and variations thereof refer to obtaining information from another module actively or receiving information sent by another module. 
     It is understandable to those skilled in the art that the accompanying drawings are only schematic diagrams of the exemplary embodiments, and that the modules or processes in the accompanying drawings are not mandatory for implementing the present invention. 
     Persons of ordinary skill in the art should understand that all or part of the steps of the method specified in any embodiment of the present invention may be implemented by a program instructing relevant hardware. The program may be stored in a computer readable storage medium. When the program runs, the program executes one or more steps in the method embodiments of the present invention. 
     In addition, all functional units in the embodiments of the present invention may be integrated into a processing module or exist separately, or two or more of the units are integrated into one module. The integrated module may be hardware or a software module. When being implemented as a software module and sold or used as a stand-alone product, the integrated module may be stored in a computer-readable storage medium. 
     The storage medium may be a Read Only Memory (ROM), a magnetic disk, or a Compact Disk-Read Only Memory (CD-ROM). 
     In conclusion, the technical solutions of the embodiments of the present invention bring the benefits of reducing energy consumption of the BS and improving energy efficiency of the BS. 
     The preceding descriptions are merely exemplary embodiments of the present invention, but not intended to limit the scope of the present invention. Any modifications, variations or replacements that can be easily derived by those skilled in the art shall fall within the scope of the present invention. Therefore, the scope of the present invention is subject to the appended claims.