WO2011054229A1 - Procédé et station de base de commande de puissance à boucle fermée dans un système à sauts de fréquence - Google Patents

Procédé et station de base de commande de puissance à boucle fermée dans un système à sauts de fréquence Download PDF

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Publication number
WO2011054229A1
WO2011054229A1 PCT/CN2010/075950 CN2010075950W WO2011054229A1 WO 2011054229 A1 WO2011054229 A1 WO 2011054229A1 CN 2010075950 W CN2010075950 W CN 2010075950W WO 2011054229 A1 WO2011054229 A1 WO 2011054229A1
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WO
WIPO (PCT)
Prior art keywords
frequency point
value
base station
frequency
power
Prior art date
Application number
PCT/CN2010/075950
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English (en)
Chinese (zh)
Inventor
郭启俊
卢勤博
张昆
Original Assignee
中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2011054229A1 publication Critical patent/WO2011054229A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/143—Downlink power control

Definitions

  • the present invention relates to the field of communications, and in particular to a closed loop power control method and base station for a frequency hopping system.
  • GSM Global System for Mobile Communication
  • a Global System for Mobile Communication (GSM) base station transmitter uses a closed loop power control method. After the forward power feedback is obtained by the power detection circuit at the same power level, the forward power feedback values of the thousands of time slots are cumulatively averaged, and the average value of the feedback power is compared with the expected power at the power level. The result is to refresh the calibration value, and then calculate the power control value obtained by querying the numerical control attenuation table at the power level. Through such a closed loop control mechanism, the transmit power is consistent with the desired power. In the GSM system, frequency hopping technology is commonly used.
  • the transmission and reception frequencies corresponding to the channel in each time slot change according to a certain law, and the frequency variation law can be divided into cyclic mega frequency and non-cyclic mega frequency.
  • the mega-frequency system can improve the transmission quality of the wireless signal, and the change of the frequency can avoid the frequency-dependent fading effect of the same frequency.
  • the GSM base station is configured with the megaphone mode, the power output of the RF power amplifier at different frequency points fluctuates greatly due to the difference in the frequency characteristics of the RF channel and the forward power feedback channel.
  • other problems may occur. For example: switching spectrum and modulation spectrum, however, RF indicators are worse. For these reasons, it is necessary to propose an effective method to solve the closed-loop power control method under the frequency hopping system.
  • both the frequency hopping system and the non-frequency hopping system use the same closed loop power control method. It is expected that the power is divided into low, medium and high sections stored in the EEPROM of the power amplifier. However, the closed loop power control does not distinguish different frequency points, resulting in the frequency hopping mode, the forward direction of different frequency points. Power feedback is added together. At the same time, for the different frequency points under the same power level, the same power control value is used to control the numerical control attenuator, so that the power output of the RF amplifier with the same power level and different frequency points fluctuates greatly.
  • the frequency hopping system accumulates the forward power feedbacks of different frequency points to perform closed-loop power control, which causes the power output of the RF power amplifiers at different frequency points to fluctuate greatly.
  • a frequency hopping system accumulates forward power feedbacks of different frequency points to perform closed loop power control, resulting in a large fluctuation in power output of a radio frequency power amplifier at different frequency points.
  • the main object of the present invention is to provide a closed loop power control scheme for a frequency hopping system to solve the above problems.
  • a closed loop power control method of a frequency hopping system includes: determining, for a frequency point of each time slot of the current frame, a power calibration value of the frequency point of the base station at a frequency point of the base station; The power calibration value performs closed loop power control on the frequency point.
  • the determining, by the base station, the power calibration value of the frequency point according to the forward power feedback value of the frequency point comprises: the base station accumulating the forward power feedback value of the frequency point into the forward power feedback accumulated value of the frequency point; the base station determining the frequency point The number of times the forward power feedback value is accumulated exceeds a predetermined threshold; the base station determines the power calibration value according to the forward power feedback accumulated value of the frequency point.
  • the determining, by the base station, the power calibration value according to the forward power feedback accumulated value of the frequency point comprises: the base station calculating an average value of the forward power feedback value of the frequency point according to the forward power feedback accumulated value of the frequency point; the base station compares the average value with the expectation The power values are compared and the power calibration values are determined based on the results of the comparison.
  • the base station saves the frequency points of the respective time slots of the previous frame, and calculates the current frequency according to the frequency points of the respective time slots of the previous frame. The frequency of each time slot of the frame.
  • the base station saves the information of the frequency point, the forward power feedback value of the frequency point, the forward power feedback accumulated value of the frequency point, and the power calibration value of the frequency point in the storage unit corresponding to the frequency point, and the number of the storage units The number of frequency hopping frequency points configured by the base station is determined.
  • a base station is also provided.
  • the base station according to the present invention includes: a determining module, configured to determine a power calibration value of the frequency point according to a forward power feedback value of the frequency point for a frequency point of each time slot of the current frame; and a power control module, configured to perform a power calibration value according to the power Closed loop power control is performed on the frequency point.
  • the determining module includes: an accumulating submodule, configured to accumulate a forward power feedback value of the frequency point into a forward power feedback accumulated value of the frequency point; and a first determining submodule, configured to determine a forward power of the frequency point The number of times the feedback value is accumulated exceeds a predetermined threshold; the second determining sub-module is configured to determine a power calibration value according to the forward power feedback accumulated value of the frequency point.
  • the second determining submodule comprises: a calculating unit, an average value of forward power feedback values of the forward power feedback accumulated value calculation frequency of the frequency point; and a comparing unit, configured to use the average value and the expected power value Performing a comparison; determining a unit for determining a power calibration value based on the result of the comparison.
  • the apparatus further includes: a calculating module, configured to calculate a frequency point of each time slot of the current frame according to a frequency point of each time slot of the previous frame.
  • the device further includes: a saving module, configured to save the information of the frequency point, the forward power feedback value of the frequency point, the forward power feedback accumulated value of the frequency point, and the frequency point in the storage unit corresponding to the frequency point
  • the power calibration value, the number of storage units is determined by the number of frequency hopping frequency points configured by the base station.
  • the closed-loop power control method is adopted for distinguishing frequency points, and the RF power amplifier of different frequency points caused by the frequency hopping system accumulating the forward power feedbacks of different frequency points in the related art is solved.
  • FIG. 1 is a flowchart of a closed loop power control method of a frequency hopping system according to an embodiment of the present invention
  • FIG. 2 is a closed loop power control of a frequency division point of a GSM frequency hopping system according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a radio frame structure of a GSM system according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of a GSM base station closed-loop power control implementation according to an embodiment of the present invention
  • FIG. 5 is a structural block diagram of a base station according to an embodiment of the present invention
  • FIG. 6 is a block diagram of a preferred structure of a base station according to an embodiment of the present invention.
  • the present invention provides a closed loop power of the frequency hopping system.
  • the control scheme the processing principle of the scheme is as follows:
  • the base station determines the power calibration value of the frequency point according to the forward power feedback value of the frequency point; the base station performs closed-loop power control on the frequency point according to the power calibration value.
  • 1 is a flowchart of a closed loop power control method of a frequency hopping system according to an embodiment of the present invention. As shown in FIG. 1, for a frequency point of each time slot of a current frame, the method includes the following steps S102 to S104: Step S102: The base station determines a power calibration value of the frequency point according to the forward power feedback value of the frequency point.
  • step S104 the base station power calibration value performs closed loop power control on the frequency point.
  • This embodiment combines the implementation principle of the frequency hopping system.
  • the closed loop power control of the frequency division can be realized by upgrading the baseband software, thereby solving the large fluctuation of the power output in the frequency hopping mode. The problem.
  • the stability of the power output in the frequency hopping mode is improved, the frequency interference of the network is effectively reduced, and the quality of the wireless network environment is improved.
  • the base station may determine the power calibration value of the frequency point by: the base station accumulating the forward power feedback value of the frequency point into the forward power feedback accumulated value of the frequency point; the base station determines the frequency point before The number of times accumulated to the power feedback value exceeds a predetermined threshold; the base station determines the power calibration value based on the forward power feedback accumulated value of the frequency point. If the number of times the forward power feedback value of the frequency point is accumulated does not reach the threshold, the accumulation continues.
  • the determining, by the base station, the power calibration value according to the forward power feedback accumulated value of the frequency point can be implemented by the following steps:
  • the forward power feedback accumulated value of the base station home frequency point calculates the forward power inverse of the frequency point The average value of the values; the base station compares the average value with the expected power value and determines the power calibration value based on the result of the comparison.
  • the base station saves the frequency points of the respective time slots of the previous frame, and calculates the current frame according to the frequency points of the respective time slots of the previous frame. The frequency of each time slot.
  • the base station stores the information of the frequency point, the forward power feedback value of the frequency point, the forward power feedback accumulated value of the frequency point, and the power calibration value of the frequency point in the storage unit corresponding to the frequency point, and the number of the storage units is configured by the base station.
  • the number of frequency hopping frequencies is determined.
  • the number of hopping frequency points configured by the base station is defined as a thousand arrays, and these arrays are used to store frequency points, forward power feedback values and power calibration values of the transmission power of each frequency point.
  • the index value and frequency of the array are - corresponding.
  • the definition of data is realized according to the maximum number of configured frequency points, which effectively saves memory space.
  • the power control value of the frequency point is calculated according to the frequency point and the power level of the next time slot to be transmitted. If the base station has a time slot requiring transmission power, the method of this embodiment can be applied; if there is no time slot transmission power, the closed loop power control according to the frequency point is ended. If the base station is configured to operate without frequency hopping, it can automatically retreat to a closed loop power control method that is not mega-frequency. The closed-loop power control is performed by distinguishing the frequency points, and the data is defined according to the maximum number of configured frequency points, which can effectively save memory space. In the following, the above technical solution will be taken as an example and the GSM system will be taken as an example.
  • Step S201 is a flow chart showing the implementation of the closed-loop power control of the frequency division point of the GSM frequency hopping system according to the embodiment of the present invention.
  • the method includes the following steps S201 to S206: Step S201, according to the configuration of the base station
  • the number of frequency hopping points which defines the forward power feedback value and the power calibration value of the transmission power of the frequency point and the frequency of each frequency point. If the array is defined by the frequency of the frequency band, for example, the frequency band of 1800M, the frequency point is 374 frequency points from 512 to 885, and defining such a large array will occupy a large memory space.
  • the maximum frequency hopping frequency of the frequency hopping system is 64, so the number of elements of the relevant array can be defined according to the maximum value, which can save more memory space.
  • Step S202 in the frequency hopping process, back up the frequency points of each time slot of the previous frame and occupy the frequency points of each time slot of one frame to calculate the frequency points of each time slot of the current frame.
  • the baseband software calculates the frequency hopping frequency of each time slot according to the type of frequency hopping (including two types of cyclic frequency hopping and non-cyclic frequency hopping), and then calculates the phase locked loop parameter, etc. .
  • FIG. 3 is a schematic diagram of a radio frame structure of a GSM system according to an embodiment of the present invention.
  • Step S203 Accumulate the forward power feedback value of the frequency point according to the frequency point of the time slot transmitted by the current air interface. Let the current air interface transmission time slot frequency point be A, and the lower time slot transmission time slot frequency point be B.
  • step S202 the frequency point A of the current air interface transmission time slot can be obtained, and the frequency point array configured by the frequency point A is queried, and the index value a of the frequency point A in the frequency point array is obtained; and then according to the index value a
  • the forward power feedback value of the frequency point A is added to the forward power feedback accumulated value array.
  • 4 is a schematic diagram of a closed loop power control implementation of a GSM base station according to an embodiment of the present invention.
  • the transmission channel of the forward power feedback in this step is shown in FIG. 4, and the power detection circuit outputs a power detection voltage value via an analog to digital converter (
  • the AD converter is converted to a baseband software (Digital Signal Processor (DSP) chip) via a Field Programable Gate Array (FPGA).
  • DSP Digital Signal Processor
  • FPGA Field Programable Gate Array
  • Step S204 If the frequency of the forward power feedback value reaches the preset threshold, calculate the average value, compare the average value with the expected power, and use the comparison result to refresh the calibration value array; otherwise, continue to accumulate.
  • the power level of the current air interface transmission time slot is X. If the accumulated power feedback value of the time slot reaches the preset threshold, the average value of the forward power feedback of the frequency point A under the power level X is calculated; The average value is compared with the expected power value of the power level X, and the calibration result array of the power level frequency point A is refreshed with the result of the comparison.
  • Step S205 Calculate the power control value of the frequency point according to the frequency point and the power level of the next time slot to be transmitted.
  • Step S206 if the base station has slot transmit power, repeat step S202, step S203, step S204, and step S205; if there is no slot transmit power, the closed loop power control flow of the crossover point is ended.
  • FIG. 5 is a structural block diagram of a base station according to an embodiment of the present invention.
  • the device includes: a determining module 52 and a power control module 54.
  • the structure is described in detail below.
  • a determining module 52 configured to determine a power calibration value of the frequency point for the frequency point of each time slot of the current frame, and the power control module 54 is connected to the determining module 52 for determining the value according to the power Closed loop power control is performed on the frequency point.
  • the determining module includes: an accumulating submodule 602, a first determining submodule 604, and a second determining submodule 606. Be explained.
  • the accumulating sub-module 602 is configured to accumulate the forward power feedback value of the frequency point into the forward power feedback accumulated value of the frequency point;
  • the first determining sub-module 604 is connected to the accumulating sub-module 602, and is used to determine the forward direction of the frequency point.
  • the second determining sub-module 606 is coupled to the first determining sub-module 604 for determining the power calibration value according to the forward power feedback accumulated value of the frequency point.
  • the second determining sub-module includes: a calculating unit 608, a comparing unit 610, and a determining unit 612. The structure will be described in detail below.
  • the calculating unit 608 is configured to calculate an average value of the forward power feedback value of the frequency point of the forward power feedback accumulated value of the frequency point; the comparing unit 610 is connected to the calculating unit 608, and is configured to compare the average value with the expected power value; The determining unit 612 is coupled to the comparing unit 610 for determining a power calibration value based on the result of the comparison.
  • the base station further includes: a calculating module 614, configured to calculate a frequency point of each time slot of the current frame according to a frequency point of each time slot of the previous frame.
  • the base station further includes: a saving module 616, configured to save the frequency in the storage unit corresponding to the frequency point.
  • a saving module 616 configured to save the frequency in the storage unit corresponding to the frequency point.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)

Abstract

La présente invention concerne un procédé et une station de base de commande de puissance à boucle fermée dans un système à sauts de fréquence. Le procédé comprend les étapes suivantes : pour un point de fréquence de chaque intervalle de temps d'une trame actuelle, la station de base détermine une valeur d'étalonnage de puissance du point de fréquence selon une valeur de rétroaction de puissance avant du point de fréquence (S102); la station de base réalise une commande de puissance à boucle fermée sur le point de fréquence selon la valeur d'étalonnage de puissance (S104). La présente invention améliore la stabilité de puissance de sortie du système à sauts de fréquence, réduit le brouillage dans un même canal et améliore la qualité d'environnement de réseau sans fil.
PCT/CN2010/075950 2009-11-03 2010-08-12 Procédé et station de base de commande de puissance à boucle fermée dans un système à sauts de fréquence WO2011054229A1 (fr)

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CN200910209651.0 2009-11-03
CN2009102096510A CN102056275A (zh) 2009-11-03 2009-11-03 跳频系统的闭环功率控制方法及基站

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104820913A (zh) * 2015-04-24 2015-08-05 北京京东尚科信息技术有限公司 一种补货方法和装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107508644B (zh) * 2016-06-14 2020-07-31 南京中兴软件有限责任公司 一种反馈通道在线校准方法及其装置
CN113114284B (zh) * 2021-04-12 2023-01-06 维沃移动通信有限公司 射频电路的控制方法、控制装置和电子设备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1256816A (zh) * 1997-05-16 2000-06-14 诺基亚网络有限公司 移动通信系统中的功率控制
WO2002032006A2 (fr) * 2000-10-09 2002-04-18 Telefonaktiebolaget L M Ericsson (Publ) Regulation de la puissance d'un canal rf

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1256816A (zh) * 1997-05-16 2000-06-14 诺基亚网络有限公司 移动通信系统中的功率控制
WO2002032006A2 (fr) * 2000-10-09 2002-04-18 Telefonaktiebolaget L M Ericsson (Publ) Regulation de la puissance d'un canal rf

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104820913A (zh) * 2015-04-24 2015-08-05 北京京东尚科信息技术有限公司 一种补货方法和装置

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