WO2016095496A1 - Procédé et appareil de commande de puissance et terminal - Google Patents

Procédé et appareil de commande de puissance et terminal Download PDF

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Publication number
WO2016095496A1
WO2016095496A1 PCT/CN2015/083216 CN2015083216W WO2016095496A1 WO 2016095496 A1 WO2016095496 A1 WO 2016095496A1 CN 2015083216 W CN2015083216 W CN 2015083216W WO 2016095496 A1 WO2016095496 A1 WO 2016095496A1
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WIPO (PCT)
Prior art keywords
power
terminal
primary station
satellite
predetermined threshold
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PCT/CN2015/083216
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English (en)
Chinese (zh)
Inventor
薛兵
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中兴通讯股份有限公司
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Publication of WO2016095496A1 publication Critical patent/WO2016095496A1/fr

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    • 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
    • H04W52/08—Closed loop power control
    • 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

Definitions

  • the present invention relates to the field of satellite communications, and in particular to a power control method, apparatus and terminal.
  • Satellite communication refers to the communication between two or more ground stations by using artificial satellites as relay stations to forward or reflect radio signals.
  • the satellite communication system is mainly composed of satellite, ground main station, ground terminal and ground satellite control center. .
  • the satellite contains a transponder that receives the ground station signal, amplifies the small signal, mixes it, amplifies the power, and transmits it to the ground station.
  • the ground satellite control center is used to monitor the satellite status and control the satellite's orbit, attitude, power, etc.
  • the terrestrial main station is quite a multi-port transponder (HUB for short), which is connected to the ground terminal via satellite relay on the one hand and to the Internet via a gateway on the other hand.
  • the ground station radio system includes a transceiver module, a frequency conversion module, a power amplifier module, a low noise receiving module, an antenna, and a servo control system.
  • Radio waves in space communication systems operating above 10 GHz are often subject to various attenuation effects.
  • the environmental impact is mainly due to tropospheric scintillation, cloud attenuation, rain attenuation and atmospheric attenuation, as well as periodic changes caused by the drift of the satellite itself. .
  • the power control of the terrestrial primary station is to change the transmit power of the ground station in order to maintain the received power of the receiver when path attenuation occurs. Specifically, the transmission power is increased when fading occurs, and the transmission power is reduced after the fading event disappears.
  • the purpose of the power control is to increase the output power proportionally to the link attenuation, while ensuring that the ground station's power to the satellite is too high to generate inter-system interference and interference from adjacent satellites.
  • the satellite receiver front-end over-excitation or the same transponder with multiple carriers sharing the nonlinear amplifier, must maintain power balance to avoid the gain suppression of the weak carrier and generate interference within the system.
  • VSAT Small Small Aperture Terminal
  • Figure 1 is a schematic diagram of the interference to the satellite in the satellite communication system.
  • the antenna radius of the VSAT is small, which may cause interference to the satellite next to the target satellite.
  • Figure 2 is a schematic diagram of the power control method of the conventional earth station.
  • the traditional satellite communication ground stations are large antenna systems, the antenna beam is very narrow, and the antenna system is complex.
  • the power control is to detect the received signal level on the satellite through telemetry remote sensing technology (return through the telemetry remote sensing link).
  • Ground which controls the output of the ground station's power amplifier according to the level received on the satellite; this method uses complex equipment and is costly and cannot be used in satellite communication systems for civil VSAT.
  • the base station sends the terminal to increase or decrease the power according to the received signal quality, and the terminal performs an operation after receiving the command, and the base station sends the new function of the terminal according to the received new signal quality.
  • Control commands until the terminal power reaches a reasonable value; while satellite communication, especially civil synchronous orbit satellite communication, the delay between the communication between the primary station and the terminal is long, and the delay is often greater than the coherence time of fast fading. unrealistic.
  • the present invention provides a power control method, apparatus and terminal to at least solve the problem of how to conveniently implement power control of satellite communication in the related art.
  • a power control method includes: determining a transmit power of a terminal, determining whether the transmit power is less than a predetermined threshold, and controlling a transmit power of the terminal if the determination result is yes.
  • determining the transmit power of the terminal includes: detecting, by the terminal, a signal received power of the primary station to which the terminal belongs, determining a transmit power of the terminal according to the received power of the signal, and the power parameter of the primary station.
  • determining, by using the following formula, the transmit power of the terminal according to the received power of the signal and the power parameter of the primary station: Put Pbt+Pbr_n0+C/N-Pur-10*lg(M)+C 1 , wherein, Put For the transmission power of the terminal, Pur is the signal receiving power.
  • the power parameters of the primary station include: Pbt is the transmitting power of the primary station, Pbr_n0 is the receiving noise of the primary station when the primary station has no transmitting power, and C/N is the primary station.
  • the minimum signal to noise ratio, M is the number of carriers of the channel between the terminal and the primary station, and C 1 is the gain constant between the terminal and the primary station.
  • the method before determining whether the transmit power is less than a predetermined threshold, the method further includes: determining a reference value according to one or more beacon powers from the satellite, where the reference value is a maximum value of one or more beacon powers of the satellite.
  • the predetermined threshold is determined based on the current beacon power of the satellite and the reference value.
  • the method further includes: if the determination result is negative, prohibiting, according to the predetermined threshold, controlling the transmit power of the terminal.
  • a power control apparatus including: a first determining module, configured to determine a transmit power of a terminal, and a determining module configured to determine whether a transmit power is less than a predetermined threshold, and the control module is configured to determine When the judgment result of the module is YES, the transmission power of the terminal is controlled.
  • the first determining module includes: a detecting unit, configured to detect that the terminal receives the signal receiving power of the primary station to which the terminal belongs, and the determining unit is configured to determine the transmitting power of the terminal according to the signal receiving power and the power parameter of the primary station. .
  • the noise floor, C/N is the minimum signal-to-noise ratio of the master station, M is the number of carriers of the channel between the terminal and the master station, and C 1 is the gain constant between the terminal and the master station.
  • the apparatus further comprises: a second determining module configured to determine a reference value based on one or more beacon powers from the satellite, wherein the reference value is a maximum of one or more beacon powers of the satellite
  • the third determination module is configured to determine a predetermined threshold based on the current beacon power of the satellite and the reference value.
  • the device further includes: a prohibiting module, configured to prohibit, when the determining result of the determining module is negative, controlling the transmitting power of the terminal.
  • a prohibiting module configured to prohibit, when the determining result of the determining module is negative, controlling the transmitting power of the terminal.
  • a terminal comprising the apparatus of any of the above.
  • the embodiment of the present invention determines whether the transmission power is less than a predetermined threshold by using the transmission power of the terminal, and controls the transmission power of the terminal in the case that the determination result is yes, and how to conveniently implement the satellite in the related art.
  • the problem of power control of communication in turn, achieves the effect of low-cost control of power through terminal control power.
  • Figure 1 is a schematic diagram of interference to a satellite in a satellite communication system
  • FIG. 2 is a schematic diagram of a conventional ground station power control method
  • FIG. 3 is a flow chart of a method of power control in satellite communication in accordance with an embodiment of the present invention.
  • FIG. 4 is a block diagram showing the structure of an apparatus for power control in satellite communication according to an embodiment of the present invention.
  • FIG. 5 is a block diagram showing a preferred structure of an apparatus for power control in satellite communication in accordance with a preferred embodiment of the present invention
  • FIG. 6 is a block diagram of another preferred structure of an apparatus for power control in satellite communication in accordance with a preferred embodiment of the present invention.
  • FIG. 7 is a block diagram of another preferred structure of an apparatus for power control in satellite communication in accordance with a preferred embodiment of the present invention.
  • FIG. 8 is a structural block diagram of a terminal according to an embodiment of the present invention.
  • FIG. 9 is a schematic diagram of gains of a satellite communication system in accordance with an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a terminal beacon receiver performing transmission and reception power detection according to a preferred embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of beacon power detection performed by a terminal radio frequency receiver according to a preferred embodiment of the present invention.
  • FIG. 12 is a flow chart of a method for iterating on a sunny beacon power in accordance with a preferred embodiment of the present invention.
  • FIG. 3 is a flowchart of a power control method according to an embodiment of the present invention, as shown in FIG. The process includes the following steps:
  • Step S302 determining a transmit power of the terminal
  • Step S304 determining whether the transmission power is less than a predetermined threshold
  • step S306 if the result of the determination is yes, the transmission power of the terminal is controlled.
  • the terminal itself determines the transmit power of the terminal, and the terminal itself determines whether the transmit power is less than a predetermined threshold. If the result of the determination is yes, if the terminal's own transmit power is less than a predetermined threshold, the terminal itself is to the terminal.
  • the transmission power is controlled to solve the problem of how to conveniently realize the power control of satellite communication in the related art, and the efficiency of controlling power in satellite communication is improved by the terminal itself controlling its own transmission power.
  • the terminal When determining the transmission power of the terminal, a plurality of methods may be adopted. Considering the environmental factors in which the terminal transmits the signal, the terminal may first detect the signal receiving power received by the terminal to the primary station to which the terminal belongs; according to the signal receiving power and the power of the primary station. The parameters determine the transmit power of the terminal. It should be noted that the received power of the signal received by the terminal and the power parameter of the primary station are more important factors for determining the transmit power of the terminal. Of course, if the specific situation involves other more important factors, it can also be considered separately.
  • the transmission of the terminal may be determined according to the signal received power and the power parameter of the primary station by the following formula.
  • Power: Put Pbt+Pbr_n0+C/N-Pur-10*lg(M)+C 1 , where Put is the transmit power of the terminal, Pur is the received power of the signal, and the power parameters of the primary station include: Pbt as the primary station transmit power, Pbr_n0 of the background noise received at the master station does not transmit power of the primary station, C / N of the minimum SNR-based station, M being the number of carriers in the channel between the terminal and the master station, C 1 and the terminal Gain constant between the master stations;
  • the power parameters of the primary station include: Pbt is the transmission power of the primary station, Pbr_n0 is the reception noise floor of the primary station when the primary station has no transmission power, and the minimum signal to noise ratio of the C/N is the primary station, M For the number of carriers on the channel between the terminal and the primary station, C 1 is the gain constant between the terminal and the primary station, which more objectively describes the environment in which the terminal is located, and can improve the accuracy of the terminal controlling the transmission power.
  • the predetermined threshold may be determined in various manners before determining whether the transmit power is less than a predetermined threshold. For example, it may be determined by determining a reference value according to one or more beacon powers from the satellite, where The reference value is the maximum of one or more beacon powers of the satellite; the predetermined threshold is determined based on the current beacon power of the satellite and the reference value.
  • the determined reference value may be by selecting the maximum value of one or more beacon powers, that is, the beacon power on a sunny day, for example, the beacon power for the star transmission is -80 dB, and the letter received at the terminal
  • the cloud power may be in the case of a target power of -85 dB, which may be sunny when the beacon power received by the terminal is -79 dB.
  • determining the predetermined threshold according to the current beacon power and the reference value of the satellite may also adopt various manners.
  • Px0 is the reference value
  • Pxr is the current beacon power
  • A is the threshold of the transmit power of the terminal when it is sunny
  • C 2 is the uplink and downlink attenuation constant.
  • the method further includes: if the determination result is negative, prohibiting control of the transmit power of the terminal; that is, when the transmit power of the terminal is greater than or equal to a predetermined threshold, The transmitting power of the terminal is greater than the receiving power that the satellite can withstand. At this time, it will interfere with the system or with the satellite, which is not conducive to the communication between the terminal and the satellite and the master station in the satellite communication. Therefore, the transmission of the terminal is prohibited at this time. The power is controlled to effectively protect the safety of the equipment.
  • a power control device is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and has not been described again.
  • the term "module” may implement a combination of software and/or hardware of a predetermined function.
  • the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and contemplated.
  • FIG. 4 is a structural block diagram of a power control apparatus according to an embodiment of the present invention.
  • the apparatus may be a terminal, but is not limited thereto.
  • the apparatus includes: a first determining module 42, a determining module 44, and a control. Module 46, the device will be described below.
  • the first determining module 42 is configured to determine the transmit power of the terminal, and the determining module 44 is connected to the first determining module 42 to determine whether the transmit power is less than a predetermined threshold.
  • the control module 46 is connected to the determining module 44, and is configured to In the case where the determination result of the determination module 44 is YES, the transmission power of the terminal is controlled.
  • FIG. 5 is a block diagram of a preferred structure of a power control apparatus according to a preferred embodiment of the present invention.
  • the apparatus may be a terminal, but is not limited thereto.
  • the apparatus includes all the structures shown in FIG.
  • a determining module includes a detecting unit 52 and a determining unit 54, which will be described below.
  • the detecting unit 52 is configured to detect that the terminal receives the signal receiving power of the primary station to which the terminal belongs, and the determining unit 54 is connected to the detecting unit 52, and is configured to determine the transmitting power of the terminal according to the signal receiving power and the power parameter of the primary station.
  • the noise floor, C/N is the minimum signal-to-noise ratio of the master station, M is the number of carriers of the channel between the terminal and the master station, and C 1 is the gain constant between the terminal and the master station.
  • FIG. 6 is a block diagram of another preferred structure of a power control apparatus according to a preferred embodiment of the present invention.
  • the apparatus may be a terminal, but is not limited thereto.
  • the apparatus includes all the structures shown in FIG.
  • the apparatus also includes one of the following: a second determination module 62 or a third determination module 64, the preferred structure being described below.
  • the second determining module 62 is coupled to the first determining module 42 and configured to determine a reference value based on one or more beacon powers from the satellite, wherein the reference value is a maximum of one or more beacon powers of the satellite
  • the third determination module 64 is coupled to the second determination module 62 and is configured to determine a predetermined threshold based on the current beacon power of the satellite and the reference value.
  • FIG. 7 is a block diagram of another preferred structure of a power control device according to a preferred embodiment of the present invention.
  • the device may be a terminal, but is not limited thereto. As shown in FIG. 7, the device includes FIGS. 4, 5, and 6. In addition to all of the structures shown, it also includes a disable module 72, which is described below.
  • the prohibition module 72 is connected to the control module 46, and is set to prohibit the control of the transmission power of the terminal when the determination result of the determination module 44 is negative.
  • the transmitting power of the terminal is greater than or equal to a predetermined threshold
  • the transmitting power of the terminal is greater than the receiving power that the satellite can bear, and the interference may occur in the system or on the satellite. It is not conducive to the communication between the terminal and the satellite and the main station in satellite communication, so it is forbidden to control the transmission power of the terminal at this time.
  • FIG. 8 is a structural block diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 8, the terminal 800 includes any of the power control devices 82 described above.
  • the power control of the expensive and complicated ground station in the related art is overcome, and the terminal itself controls the transmission power, and self-adjusts the transmission power according to the received signal strength of the primary station, thereby realizing a simple Fast ground station power control.
  • FIG. 9 is a schematic diagram of the gain of the satellite communication system according to the embodiment of the present invention, as shown in FIG. , you can get the following formula:
  • the Pur terminal receives power, and the Put terminal transmits power in units of dBw;
  • Pbr master station receiving power Pbt master station transmitting power, unit dBw;
  • Gbpa-Gblna the difference between the gain of the main station power amplifier and the low noise block (Low Noise Block, LNB) under the low noise of the main station, in dBw;
  • Gbt-Gbr the difference between the transmit gain and the receive gain of the primary station antenna, in dBw;
  • fbt is the transmission frequency of the main station
  • the transmission frequency of the fut terminal is the transmission frequency of the fut terminal
  • fbr is the reception power of the main station
  • fur is the reception frequency of the terminal
  • Lbr-Lbt (Lur-Lut) ⁇ 0, where Lbr-Lbt is the receive-transmit filter difference of the primary station, and Lur-Lut is the receive filter-transmit filter difference of the terminal;
  • Pbr is the power received by the primary station.
  • the receiving base noise Pbr_n0 of the primary station and the primary station with large aperture are measured.
  • the noise floor is mainly the noise floor sent by the satellite.
  • the noise floor is the noise floor of the satellite + the noise floor of the main station itself.
  • the terminal transmit power can be found:
  • the primary station can send the relevant parameters to the terminal, so the quasi-constant C 1 of Equation 1 can be memorized and corrected as long as the terminal communication is successful.
  • the International Telecommunication Union transmits the terminal antennas of different calibers.
  • the power threshold requirements are different, and the requirements for miniaturized civilian VSAT are more stringent.
  • Closed-loop power control can adjust the system link to work at the best signal-to-noise ratio, but can not judge the power level of the satellite, so the power threshold cannot be controlled and controlled, causing intervening interference or communication interruption:
  • the terminal power is increased without restriction, and it is easy to cause interference to the satellite;
  • the main station forcibly increases the transmission power of the terminal to meet the signal-to-noise ratio received by the primary station, which may cause the power of the terminal station to the satellite to be too large, causing the approaching star.
  • the interference is excessive or other weak carriers of the satellite transponder are suppressed, causing interference to other satellites or systems; while the main station is clear sky, the terminal encounters trees blocking or heavy rain, the terminal to satellite insertion loss becomes larger, the terminal can increase Transmitting power without increasing power causes communication to be interrupted.
  • the beacon power of the satellite is continuously monitored, and the attenuation of the uplink channel is estimated according to the change of the beacon power.
  • FIG. 10 is a schematic structural diagram of a terminal beacon receiver performing transmission and reception power detection according to a preferred embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of a beacon power detection performed by a terminal radio frequency receiver according to a preferred embodiment of the present invention, as shown in FIG. 10 and FIG.
  • the beacon received by the receiver is a tone signal, which can be identified by the following formula:
  • Xr(t) X0(t)*Ad(t)*Sd(t)*cos( ⁇ t)+N0;
  • X0(t) is the beacon amplitude in clear sky
  • Ad(t) is the rain attenuation function
  • Sd(t) is the flicker attenuation function
  • ⁇ is the angular frequency
  • N0 is the noise.
  • the system can ignore the noise.
  • the amplitude power obtained by sampling the amplitude information of the beacon is converted into dB after receiving the beacon power of the terminal, and is expressed as follows:
  • Pxr Px0+Ad+Sd (Note: Ad and Sd are not 0. If it is 0, dB calculation cannot be performed); where Pxr is the beacon power received by the terminal (function is the same as the current beacon power above), Px0 is The beacon power received by the terminal on a sunny day (function is the same as the above reference value), Ad is the value obtained by converting the rain attenuation function into dB, and Sd is the value obtained by converting the flicker attenuation function into dB.
  • Fu is the uplink frequency and fd is the downlink frequency in GHz.
  • the operating frequency of a terminal is fixed, and the beacon frequency of each satellite is also fixed, so the frequency conversion factor is fixed; after conversion to dB, the frequency conversion factor is constant; the uplink attenuation can be obtained by the following formula:
  • Lu is the uplink attenuation
  • L0 is the attenuation when clear sky
  • Ad is the downlink rain attenuation
  • Sd is the downward flicker attenuation
  • C 2 is a constant, and can be obtained by substituting the frequency value.
  • the terminal determines the antenna aperture according to the requirements of the ITU, and can obtain the transmit power threshold A on a sunny day; that is, the power received by the satellite is Pwr ⁇ A+L0; that is, the Put+Pxr-Px0+C ⁇ A is guaranteed; Available: Put ⁇ Px0-Pxr+AC 2 .
  • a preferred embodiment 1 of a power control method is provided in conjunction with FIGS. 10 and 11, the method comprising the steps of:
  • Timing start power control process calculate satellite beacon power, terminal detection power, etc.
  • the beacon power is the reference value, and iteratively iterates to obtain the reference value of the sunny day.
  • FIG. 12 is a schematic flowchart of a method for iterative power of a sunny beacon power according to a preferred embodiment of the present invention. As shown in FIG. 12, the method includes:
  • Step S1202 calculating a difference ⁇ between the beacon power (the function is the same as the current beacon power) and the initial beacon power (the function is the same as the above reference value);
  • Step S1204 determining whether ⁇ is greater than 0.2 dB;
  • Step S1206 If the determination result is yes, update the new beacon power to the reference value
  • step S1208 if the result of the determination is negative, the beacon power is not updated.
  • modules or steps of the embodiments of the present invention can be implemented by a general computing device, which can be concentrated on a single computing device or distributed in multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device such that they may be stored in the storage device by the computing device and, in some cases, may be different from The steps shown or described are performed sequentially, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps thereof are fabricated into a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
  • the above embodiments and preferred embodiments solve the problem of how to conveniently implement power control of satellite communication in the related art, thereby achieving the effect of low-cost control of power by terminal control power.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

La présente invention concerne un procédé et un appareil de commande de puissance et un terminal. Le procédé comprend les étapes de : détermination de la puissance de transmission d'un terminal ; détermination si oui ou non la puissance de transmission est inférieure à un seuil prédéfini ; et commande de la puissance de transmission du terminal si le résultat de la détermination est affirmatif. Au moyen de la présente invention, le problème dans la technique associée concernant la manière commode de mettre en œuvre la commande de puissance dans une communication par satellite est résolu.
PCT/CN2015/083216 2014-12-18 2015-07-02 Procédé et appareil de commande de puissance et terminal WO2016095496A1 (fr)

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CN201410798057.0A CN105763241A (zh) 2014-12-18 2014-12-18 功率控制方法、装置和终端

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US10582455B2 (en) * 2016-08-31 2020-03-03 Qualcomm Incorporated System and method for reducing interference from neighboring wireless devices
CN110621048A (zh) * 2018-06-19 2019-12-27 索尼公司 用于卫星通信的用户设备
CN112217569B (zh) * 2020-09-27 2021-11-16 武汉光迅科技股份有限公司 一种功率调节方法、装置及存储介质
CN114978294B (zh) * 2022-07-29 2022-10-11 成都星联芯通科技有限公司 功率调整方法、装置、主站设备及小站设备

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CN103684550A (zh) * 2013-12-20 2014-03-26 上海斐讯数据通信技术有限公司 一种蓝牙信号发射功率调整系统及移动终端

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US20060270442A1 (en) * 2004-07-30 2006-11-30 Viasat, Inc. Leader-follower power control
CN102655671A (zh) * 2011-03-02 2012-09-05 北京大学 一种用于卫星cdma系统的功率控制方法
CN103401602A (zh) * 2013-07-31 2013-11-20 绵阳灵通电讯设备有限公司 便携式卫星地面站发射功率自动控制装置
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