CN105763241A - Power control method, device and terminal - Google Patents

Power control method, device and terminal Download PDF

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Publication number
CN105763241A
CN105763241A CN201410798057.0A CN201410798057A CN105763241A CN 105763241 A CN105763241 A CN 105763241A CN 201410798057 A CN201410798057 A CN 201410798057A CN 105763241 A CN105763241 A CN 105763241A
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CN
China
Prior art keywords
described
power
terminal
main website
transmitting power
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CN201410798057.0A
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Chinese (zh)
Inventor
薛兵
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中兴通讯股份有限公司
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Priority to CN201410798057.0A priority Critical patent/CN105763241A/en
Publication of CN105763241A publication Critical patent/CN105763241A/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/06TPC algorithms
    • H04W52/08Closed loop power control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/06TPC algorithms
    • H04W52/14Separate analysis of uplink or downlink

Abstract

The invention discloses a power control method, device and terminal. The method includes determining transmission power of the terminal; judging whether the transmission power is smaller than a predetermined threshold value or not; and controlling the transmission power of the terminal if the judgment result is that the transmission power is smaller than the predetermined threshold value. According to the invention, a problem about how to realize power control of satellite communication conveniently in related art is solved.

Description

Poewr control method, device and terminal

Technical field

The present invention relates to satellite communication field, in particular to a kind of Poewr control method, device and terminal.

Background technology

Satellite communication refers to and utilizes artificial satellite to forward as relay station or reflection radio signal, the communication carried out between two or more earth stations, and satellite communication system is mainly by satellite, ground main website, ground based terminal, ground satellite control centre four part composition.

Satellite comprises a transponder, and it is used for satellite receiver signal, by low level signal amplification, mixing, power amplification, then is transmitted into earth station.Ground satellite control centre is used for monitoring satellitosis the track to satellite, attitude, and power etc. is controlled.

The suitable multiport transponder (referred to as HUB) of ground main website, it is connected by satellite relay and ground based terminal on the one hand, is connected to internet by gateway on the other hand.Main website radio system in ground includes Transceiver Module, frequency-variable module, power amplifier module, LNA receiver module, antenna and servo-control system etc..

The space communication system radio wave being operated in more than 10GHz frequently suffers from the impact of various decay, the impact of environment is mainly due to tropospheric scintillation, cloud and mist decay, attentuation by rain and what atmospheric attenuation caused, in addition with the cyclically-varying that the own drift of satellite etc. causes.

It is when there is path attenuation that the power of ground main website controls, for keeping the reception power of receiver and changing earth station's transmitting power.Specifically being exactly increase transmitting power when there is decline, fading event reduces transmitting power after disappearing.The purpose of power control is according to link attenuation proportional increase output, to ensure that earth station arrives the too high interference with the interference between generation system and adjacent satellite of the power of satellite simultaneously.

When adopting power to control, if the transmitting power controlled is too high is likely to result in two problems:

1. DVB front end blasting, or multicarrier shares the same transponder of nonlinear amplifier, it is necessary to keep power-balance, and the gain to evade weak carrier wave suppresses, and produces intrasystem interference.

2. the antenna radius of extra small bore ground based terminal (VerySmallApertureTerminal, referred to as VSAT) is less, and the wave beam of antenna is wider, and radiant power is disperseed, it is easy to the star that faces on target satellite side is produced interference.

Fig. 1 be in Satellite Communication System to face star interference schematic diagram, as it is shown in figure 1, the antenna radius of VSAT less to target satellite side face star can produce interference;Fig. 2 is the schematic diagram of sphere station Poewr control method traditionally, as shown in Figure 2, traditional satellite communication earth station is all large-scale antenna system, antenna beam is very narrow, and antenna system is complicated, power controls to be by remote measurement remote sensing technology, and received signal level (returning to ground by remote measurement remote sensing link) on detection satellite, according to the output of the power amplifier of the Automatic level control earth station received on satellite;The equipment that this method uses is complicated and costly, it is impossible to for the Satellite Communication System of civilian VSAT.

Traditional base station communication system circule power control method, by base station according to received signal quality, issues terminal to increase or to reduce power, terminal performs operation after receiving instruction, base station is according to the new signal quality received, then issues the power control commands that terminal is new, until terminal power reaches a reasonable value;And the time delay of satellite communication, especially civilian gso satellite communication, main website and terminal communication is very long, time delay is commonly greater than the coherence time of rapid fading, makes unpractical often in this way.

Owing to civilian VSAT is a new industry, current industrialization it is crucial that the low cost of terminal and miniaturization, there is presently no the rational method of comparison, VSAT carried out power control;How low cost, quickly realize earth station's power and control to be a technical barrier of miniaturization commercial satellite communication.

For the problem that the power how realizing satellite communication in correlation technique easily controls, effective solution is not yet proposed at present.

Summary of the invention

The invention provides a kind of Poewr control method, device and terminal, at least to solve how correlation technique realizes problem that the power of satellite communication controls easily.

According to an aspect of the present invention, it is provided that a kind of Poewr control method, comprise determining that the transmitting power of terminal, it is judged that whether transmitting power is less than predetermined threshold, when judged result is for being, the transmitting power of terminal is controlled.

Preferably, it is determined that the described transmitting power of terminal includes: detection terminal receives the signal of main website belonging to terminal and receives power, and basis signal receives power, and the power parameter of main website determines the transmitting power of terminal.

Preferably, by below equation, basis signal receives power, and the power parameter of main website determines the transmitting power of terminal: Put=Pbt+Pbr_n0+C/N-Pur-10*lg (M)+C1Wherein, Put is the transmitting power of terminal, Pur is that signal receives power, the power parameter of main website includes: Pbt is the transmitting power of main website, Pbr_n0 be when main website does not have transmitting power main website receive that make an uproar in the end, C/N is the minimum signal to noise ratio of main website, M is the carrier number of channel, C between terminal and main website1For the gain constant between terminal and main website.

Preferably, before judging that whether transmitting power is less than predetermined threshold, also include: determine reference value according to the one or more beacon power from satellite, wherein, reference value is the maximum in one or more beacon power of satellite, and current beacon power and reference value according to satellite determine predetermined threshold.

Preferably, by below equation, by below equation, current beacon power and reference value according to satellite determine predetermined threshold: B=Px0-Pxr+A-C2, wherein, B is predetermined threshold, and Px0 is reference value, and Pxr is current beacon power, the threshold value of the transmitting power of terminal, C when A is fine day2For up-downgoing attenuation constant.

Preferably, after judging that whether transmitting power is less than predetermined threshold, also include: when judged result is no, forbid, according to predetermined threshold, the transmitting power of terminal being controlled.

According to an aspect of the present invention, provide a kind of output control device, including: first determines module, for determining the transmitting power of terminal, judge module, is used for judging that whether transmitting power is less than predetermined threshold, controls module, for when the judged result of judge module is for being, the transmitting power of terminal being controlled.

Preferably, above-mentioned first determines that module includes: detection unit, and the signal receiving main website belonging to terminal for detecting terminal receives power, it is determined that unit, receives power for basis signal, and the power parameter of main website determines the transmitting power of terminal.

Preferably, above-mentioned determine that unit includes, be additionally operable to by below equation, basis signal receive power, and the power parameter of main website determine the transmitting power of terminal: Put=Pbt+Pbr_n0+C/N-Pur-10*lg (M)+C1Wherein, Put is the described transmitting power of terminal, Pur is that signal receives power, the power parameter of main website includes: Pbt is the transmitting power of main website, Pbr_n0 be when main website does not have transmitting power main website receive that make an uproar in the end, C/N is the minimum signal to noise ratio of main website, M is the carrier number of channel, C between terminal and main website1For the gain constant between terminal and main website.

Preferably, this device also includes: second determines module, for determining reference value according to the one or more beacon power from satellite, wherein, reference value is the maximum in one or more beacon power of described satellite, 3rd determines module, for determining predetermined threshold according to the current beacon power of satellite and reference value.

Preferably, the above-mentioned 3rd determines that module includes, and is additionally operable to by below equation, and current beacon power and reference value according to satellite determine predetermined threshold: B=Px0-Pxr+A-C2, wherein, B is predetermined threshold, and Px0 is reference value, and Pxr is current beacon power, the threshold value of the transmitting power of terminal, C when A is fine day2For up-downgoing attenuation constant.

Preferably, this device also includes: disabled module, for when the judged result of judge module is no, forbidding the transmitting power of terminal is controlled.

Further aspect according to the present invention, it is provided that a kind of terminal, including the device that any of the above-described item is above-mentioned.

Pass through the present invention, adopt the transmitting power determining terminal, judge that whether transmitting power is less than predetermined threshold, when judged result is for being, the described transmitting power of terminal is controlled, solve and how correlation technique realizes problem that the power of satellite communication controls easily, and then reached to be realized by terminal control power the effect of low cost control power.

Accompanying drawing explanation

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is to the schematic diagram facing star interference in Satellite Communication System;

Fig. 2 is the schematic diagram of tradition earth station Poewr control method;

Fig. 3 is the flow chart of the method that power controls in a kind of satellite communication according to embodiments of the present invention;

Fig. 4 is the structured flowchart of the device that power controls in a kind of satellite communication according to embodiments of the present invention;

Fig. 5 is a kind of preferred structure block diagram of the device that power controls in satellite communication according to the preferred embodiment of the invention;

Fig. 6 is the another kind of preferred structure block diagram of the device that power controls in satellite communication according to the preferred embodiment of the invention;

Fig. 7 is the another kind of preferred structure block diagram of the device that power controls in satellite communication according to the preferred embodiment of the invention;

Fig. 8 is the structured flowchart of terminal according to embodiments of the present invention;

Fig. 9 is the gain schematic diagram of Satellite Communication System according to embodiments of the present invention;

Figure 10 is that terminal beacon receiver carries out the structural representation of transmitting-receiving power detection according to the preferred embodiment of the invention;

Figure 11 is that terminal radio frequency receiver carries out the structural representation of beacon power detection according to the preferred embodiment of the invention;

Figure 12 is the method flow diagram of fine day beacon power iteration according to the preferred embodiment of the invention.

Detailed description of the invention

Below with reference to accompanying drawing and describe the present invention in detail in conjunction with the embodiments.It should be noted that when not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.

Additionally providing a kind of Poewr control method in the present embodiment, the method can be realized by terminal, but is not limited to this, and Fig. 3 is the flow chart of a kind of Poewr control method according to embodiments of the present invention, as it is shown on figure 3, this flow process comprises the steps:

Step S302, it is determined that the transmitting power of terminal;

Step S304, it is judged that whether transmitting power is less than predetermined threshold;

Step S306, when judged result is for being, is controlled the transmitting power of terminal.

Pass through above-mentioned steps, the transmitting power of terminal is determined by terminal self, terminal self judges that whether transmitting power is less than predetermined threshold, when judged result is for being, terminal from the transmitting power of terminal less than predetermined threshold when, the transmitting power of terminal is controlled by terminal self, solves and how to realize the problem that the power of satellite communication controls in correlation technique easily, and the transmitting power being controlled self by terminal self improves the efficiency controlling power in satellite communication.

When determining the transmitting power of terminal, it is possible to adopt various ways, it is contemplated that the environmental factors residing for terminal transmission signal, it is possible to first detection terminal receives the signal reception power of main website belonging to terminal;Basis signal receives power, and the power parameter of main website determines the transmitting power of terminal.It should be noted that the signal that terminal receives receives power, and the power parameter of main website is the comparatively important factor determining terminal transmission power, if concrete condition relates to other even more important factor certainly, it is also possible to be considered separately.

When being determined the transmitting power of terminal by the power parameter receiving power and main website of terminal, various ways can also be adopted, more preferably, below equation can be passed through, basis signal receives power, and the power parameter of main website determines the transmitting power of terminal: Put=Pbt+Pbr_n0+C/N-Pur-10*lg (M)+C1Wherein, Put is the transmitting power of terminal, Pur is that signal receives power, the power parameter of main website includes: Pbt is the transmitting power of main website, Pbr_n0 be when main website does not have transmitting power main website receive that make an uproar in the end, C/N is the minimum signal to noise ratio of main website, M is the carrier number of channel, C between terminal and main website1For the gain constant between terminal and main website;

By above-mentioned formula, it is contemplated that the power parameter of main website includes: Pbt is the transmitting power of main website, Pbr_n0 be when main website does not have transmitting power main website receive that make an uproar in the end, C/N is the minimum signal to noise ratio of main website, M is the carrier number of channel, C between terminal and main website1For the gain constant between terminal and main website, describe the environment residing for terminal comparatively objectively, it is possible to improve the accuracy of terminal control transmitting power.

Alternatively, before judging that whether transmitting power is less than predetermined threshold, various ways can be adopted to determine this predetermined threshold, such as, can determine in the following manner: determine reference value according to the one or more beacon power from satellite, wherein, this reference value is the maximum in one or more beacon power of satellite;Current beacon power and reference value according to satellite determine predetermined threshold.

Such as, the reference value determined can be through choosing the maximum in one or more beacon power, namely beacon power during fine day, such as, the beacon power launched for star is-80dB, it is likely sexual intercourse weather when the beacon power that terminal receives is-85dB, is likely fine day when the beacon power that terminal receives is-79dB.

Preferably, current beacon power and reference value according to satellite determine that predetermined threshold can also adopt various ways, it is preferred that, it is possible to adopt below equation to determine this threshold value B=Px0-Pxr+A-C2, wherein, B is predetermined threshold, and Px0 is reference value, and Pxr is current beacon power, the threshold value of the transmitting power of terminal, C when A is fine day2For up-downgoing attenuation constant.

Alternatively, after judging that whether transmitting power is less than predetermined threshold, also include: when judged result is no, forbid the transmitting power of terminal is controlled;Namely when the transmitting power of terminal is be more than or equal to predetermined threshold; the reception power that the transmitting power of terminal can bear more than satellite is described; now can in system or to facing star generation interference; the communication being unfavorable in satellite communication between terminal and satellite, main website; so now forbidding the transmitting power of terminal is controlled, it is effectively protected the safety of equipment.

Additionally providing a kind of output control device in the present embodiment, this device is used for realizing above-described embodiment and preferred implementation, has be carried out repeating no more of explanation.As used below, term " module " can realize the software of predetermined function and/or the combination of hardware.Although the device described by following example preferably realizes with software, but hardware, or the realization of the combination of software and hardware is also likely to and is contemplated.

Fig. 4 is the structured flowchart of a kind of output control device according to embodiments of the present invention, and this device can be terminal, but is not limited to this, and as shown in Figure 4, this device includes: first determines module 42, judge module 44 and control module 46, below this device is illustrated.

First determines module 42, for determining the transmitting power of terminal, judge module 44, it is connected to above-mentioned first and determines module 42, for judging that whether transmitting power is less than predetermined threshold, controls module 46, is connected to above-mentioned judge module 44, for when the judged result of above-mentioned judge module 44 is for being, the transmitting power of terminal being controlled.

Fig. 5 is a kind of preferred structure block diagram of output control device according to the preferred embodiment of the invention, this device can be terminal, but it is not limited to this, as shown in Figure 5, this device includes all structures shown in Fig. 4, wherein first determines that module includes: detects unit 52 and determines unit 54, below this device being illustrated.

Detection unit 52, the signal receiving main website belonging to terminal for detecting terminal receives power, it is determined that unit 54, is connected to detection unit 52, receives power for basis signal, and the power parameter of main website determines the transmitting power of terminal.

Preferably, above-mentioned determine unit 54, be additionally operable to by below equation, basis signal receive power, and the power parameter of main website determine the transmitting power of terminal: Put=Pbt+Pbr_n0+C/N-Pur-10*lg (M)+C1Wherein, Put is the described transmitting power of terminal, Pur is that signal receives power, the power parameter of main website includes: Pbt is the transmitting power of main website, Pbr_n0 be when main website does not have transmitting power main website receive that make an uproar in the end, C/N is the minimum signal to noise ratio of main website, M is the carrier number of channel, C between terminal and main website1For the gain constant between terminal and main website.

Fig. 6 is the another kind of preferred structure block diagram of output control device according to the preferred embodiment of the invention, this device can be terminal, but it is not limited to this, as shown in Figure 6, this device includes outside all structures shown in Fig. 4, this device also includes one below: second determines that module 62 or the 3rd determines module 64, below this preferred structure is illustrated.

Second determines module 62, is connected to first and determines module 42, and for determining reference value according to the one or more beacon power from satellite, wherein, reference value is the maximum in one or more beacon power of described satellite;3rd determines module 64, is connected to second and determines module 62, for determining predetermined threshold according to the current beacon power of satellite and reference value.

Preferably, the above-mentioned 3rd determines module 64, is additionally operable to by below equation, and current beacon power and reference value according to satellite determine predetermined threshold: B=Px0-Pxr+A-C2, wherein, B is predetermined threshold, and Px0 is reference value, and Pxr is current beacon power, the threshold value of the transmitting power of terminal, C when A is fine day2For up-downgoing attenuation constant.

Fig. 7 is the another kind of preferred structure block diagram of output control device according to the preferred embodiment of the invention, this device can be terminal, but it is not limited to this, as shown in Figure 7, this device includes outside all structures shown in Fig. 4, Fig. 5 and Fig. 6, also include: disabled module 72, below this preferred structure is illustrated.

Disabled module 72, is connected to control module 46, for when the judged result of above-mentioned judge module 44 is no, forbidding the transmitting power of terminal is controlled.

Specifically, pass through said apparatus, when the transmitting power of terminal is be more than or equal to predetermined threshold, the reception power that the transmitting power of terminal can bear more than satellite is described, now can in system or to facing star generation interference, the communication being unfavorable in satellite communication between terminal and satellite, main website, so now forbidding the transmitting power of terminal is controlled.

Fig. 8 is the structured flowchart of terminal according to embodiments of the present invention, and as shown in Figure 8, this terminal 800 includes any of the above-described output control device 82.

By above-described embodiment and preferred embodiment, the power overcoming earth station costly, complicated in correlation technique controls, by terminal oneself, transmitting power is controlled, according to receiving master station signal intensity self regulation transmitting power, it is achieved that a kind of earth station simple, quick power controls.

In this programme, due to Satellite Communication System, satellite is identical with the process of terminal to main website, it is believed that the processing gain of satellite is Gain;Fig. 9 is the gain schematic diagram of Satellite Communication System according to embodiments of the present invention, as shown in Figure 9, it is possible to obtain equation below:

Gain=Put+Lu+Gupa+Lut+Gut+L3+L4+Gbr+Lbr+Gblna+Lb-Pbr

Gain=Pbt+Lb+Gbpa+Lbt+Gbt+L1+L2+Gur+Lur+Gulna+Lu-Pur

Wherein, Pur terminal receives power, Put terminal transmission power, unit dBw;

Pbr main website receives power, Pbt main website transmitting power, unit dBw;

Gbpa-Gblna, main website power amplifier gain and converter (LowNoiseBlock, referred to as the LNB) gain difference under main website low noise, unit dBw;

Gupa-Gulna, terminal power amplifier gain and terminal LNB gain difference, unit dBw;

Gbt-Gbr, primary station antennas transmitting gain and reception gain difference, unit dBw;

Gut-Gur, terminal antenna transmitting gain and reception gain difference, unit dBw;

Can obtain through arrangement:

Pur+Put+ (Gupa-Gulna)-(Lur-Lut)-(L1-L4)+Gut-Gur=Pbt+Pbr+ (Gbpa-Gblna)-(Lbr-Lbt)-(L3-L2)+Gbt-Gbr

By in Fig. 9 it can be seen that-(L1-L4)+(L3-L2)=-20log10 (fbt/fbr)+20log10 (fut/fur) ≈ 0

Wherein, fbt is the tranmitting frequency of main website, the tranmitting frequency of fut terminal, and fbr is the reception power of main website, and fur is the reception frequency of terminal;

(Lbr-Lbt)-(Lur-Lut) ≈ 0, wherein, reception-emission filter that Lbr-Lbt is main website is poor, and receiving filter-emission filter that Lur-Lut is terminal is poor;

So can obtain: Put+Pur+ (Gupa-Gulna)+Gut-Gur=Pbt+Pbr+ (Gbpa-Gblna)+Gbt-Gbr

After system work, (Gupa-Gulna)+Gut-Gur-(Gbpa-Gblna)+(Gbt-Gbr) is a constant C1

Pbr is the power that main website receives, and measures when not having transmitting power and makes an uproar Pbr_n0 at the bottom of the reception of main website, the main website that bore is big, makes an uproar in the end that mainly satellite is given of making an uproar this end.Such as, during main website bore 0.9m, this end make an uproar be make an uproar at the end that satellite is given+end of main website oneself makes an uproar.Assume that the minimum signal to noise ratio that main website needs is C/N, then it can be seen that Pbr=Pbr_n0+C/N, wherein, C is carrier energy, and N is noise.

Based on this, it is possible to obtain terminal transmission power:

Put=Pbt+Pbr_n0+C/N-Pur-10lg (carrier number)+C1(formula 1)

Once terminal access after, main website can issue terminal relevant parameter, as long as therefore terminal communication becomes merits and demerits, the quasi-constant C with correction formula 1 can be remembered1

The power of satellite communication controls there is a special place, to satellite reception to power have threshold requirement;Otherwise adjacent satellite can be produced interference, International Telecommunication Union (InternationalTelecommunicationUnion, referred to as ITU) power threshold that the terminal antenna of different bores is launched requires it is different, requires stricter to the civilian VSAT of miniaturization.

Closed-loop power control can regulate system link and be operated in the signal to noise ratio of the best, but cannot judge the power level arriving satellite, therefore power threshold cannot be carried out and control, cause and face star interference or communicating interrupt:

Because if not carrying out thresholding control, then unrestrictedly increase terminal power, it is easy to produce interference to facing star;

And simple do a thresholding and control according to facing star interference requirement, it is easy to causing communicating interrupt, such as, terminal is run on vehicle, and satellite is easy to the fluctuation having several even tens dB to the channel of terminal, and exceeds thresholding.

Such as, there is heavy rain in overhead such as main website, and overhead, terminal station is clear sky, main website forces the transmitting power strengthening terminal to meet the signal to noise ratio that main website receives, it is likely to make terminal station to arrive the power of satellite excessive, cause and face star interference and exceed standard or other weak carrier wave of satellite repeater is suppressed, other satellite or system are produced interference;And main website overhead is clear sky, terminal runs into trees and blocks or overhead heavy rain, and terminal becomes big to the Insertion Loss of satellite, and terminal can strengthen transmitting power and be not added with high-power, causes communicating interrupt.

This programme adopts the beacon power continuing surveillance satellite, estimates the decay of up channel according to beacon power change.

Fading channel mainly has two kinds, a kind of decay being cloud, rain and causing, and is referred to as rain and declines;One is scintillation decay.

Figure 10 is that terminal beacon receiver carries out the structural representation of transmitting-receiving power detection according to the preferred embodiment of the invention, Figure 11 is that terminal radio frequency receiver carries out the structural representation of beacon power detection according to the preferred embodiment of the invention, as shown in Figure 10 and Figure 11, the beacon that receiver receives is tone signal, it is possible to as follows by formula mark:

Xr (t)=X0 (t) * Ad (t) * Sd (t) * cos (ω t)+N0;

Wherein, beacon amplitude when X0 (t) is for clear sky, Ad (t) declines function for rain, and Sd (t) is scintillation decay function, and ω is angular frequency, and N0 is noise, and General System calculates can ignore noise.

Utilizing the amplitude power that the amplitude information sampling of beacon obtains, the beacon power that terminal receives is expressed as follows after being scaled dB:

Pxr=Px0+Ad+Sd (notes: Ad, Sd are not 0, if being 0, it is impossible to carry out dB calculating);Wherein, Pxr is the beacon power (function is with above-mentioned current beacon power) that terminal receives, the beacon power (function is with above-mentioned reference value) that when Px0 is fine day, terminal receives, Ad is that the rain function that declines is converted into the value after dB, and Sd is the value after scintillation decay function is converted into dB.

It is known that the formula of frequency scaling ratio that uplink and downlink rain declines is expressed as:

Wherein, φ ( f ) = f 1.72 1 + 3 × 10 - 7 f 3.44

The formula of the frequency scaling ratio of scintillation decay is expressed as:

Wherein Fu is upstream frequency, and fd is downstream frequency, and unit is GHz.

The operating frequency of one terminal is fixing, and the beacon frequency of each satellite is also fixing, and therefore frequency scaling ratio just secures;After being converted into dB, frequency scaling ratio is all constant;Upstream attenuation can be obtained by formula below:

Lu=L0+Au+Su=L0+Ad+Sd+C2

Wherein, Lu is upstream attenuation, decays when L0 is clear sky, and Ad is that descending rain declines, and Sd is descending scintillation decay, C2It is a constant, substitutes into frequency values and can be obtained by.

Due to the beacon power that terminal receives: Pxr=Px0+Ad+Sd;

The formula of the frequency scaling ratio declined by uplink and downlink rain obtains the transmitting power of the terminal that satellite reception arrives: Pwr=Put+L0+Au+Su=Put+L0+Ad+Sd+C after bringing into2=Put+Pxr-Px0+L0+C2

Terminal is according to the requirement of ITU, it is determined that antenna aperture, it is possible to obtain transmitting power threshold value A during fine day;Namely the power P wr < A+L0 that satellite reception arrives is ensured;Namely ensure Put+Pxr-Px0+C < A;Abbreviation can obtain: Put < Px0-Pxr+A-C2

Wherein Px0-Pxr > 0, if equal to 0, it was shown that do not rain and decline and scintillation decay, then C2It is 0, then needs to meet Put < A;

By iterative algorithm, find out Px0 during fine day, then only having the beacon power Pxr that receiver detects is variable;

Below the preferred embodiment for the present invention is illustrated.

Preferred implementation 1

In the preferred embodiment, providing the preferred embodiment 1 of a kind of Poewr control method in conjunction with Figure 10 and Figure 11, the method comprises the following steps:

1. terminal powers on, and after setting up communication with main website, obtains the relevant parameters such as Pbr_n0, C/N, and record beacon power now is for initializing reference value;

2. start by set date power control flow process, calculates satellite beacon power, terminal detection power etc.;

3. system initialization complete after beacon power be reference value, continuous iteration, obtain fine day reference value.

4. terminal detection receives Pur, computing terminal transmitting power: Put=Pbt+Pbr_n0+C/N-Pur-10*lg (carrier number)+C1

5. utilize formula Put < Px0-Pxr+A-C2, wherein Px0-Pxr > 0, if equal to 0, it was shown that do not rain and decline and scintillation decay, then C2It is 0;Judge in Put whether threshold range;

If 6. in threshold range, adjust power;Otherwise, prompt alarm, power cannot adjust.

Preferred implementation 2

Figure 12 is the method flow schematic diagram of fine day beacon power iteration according to the preferred embodiment of the invention, and as shown in figure 12, the method flow process includes:

Step S1202, calculates the difference Δ of beacon power (function is with above-mentioned current beacon power) and initial Beacon power (function is with above-mentioned reference value);

Step S1204, it is judged that whether Δ is more than 0.2dB;

Step S1206, when judged result is for being, updating new beacon power is reference value;

Step S1208, when judged result is no, does not update beacon power.

Obviously, those skilled in the art should be understood that, each module of the above-mentioned present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or it is distributed on the network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, can be stored in storage device is performed by calculation element, and in some cases, shown or described step can be performed with the order being different from herein, or they are fabricated to respectively each integrated circuit modules, or the multiple modules in them or step are fabricated to single integrated circuit module realize.So, the present invention is not restricted to the combination of any specific hardware and software.

The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.

Claims (13)

1. a Poewr control method, it is characterised in that including:
Determine the transmitting power of terminal;
Judge that whether described transmitting power is less than predetermined threshold;
When judged result is for being, the described transmitting power of described terminal is controlled.
2. method according to claim 1, it is characterised in that determine that the described transmitting power of described terminal includes:
Detect described terminal and receive the signal reception power of main website belonging to described terminal;
Receive power according to described signal, and the power parameter of described main website determines the described transmitting power of described terminal.
3. method according to claim 2, it is characterised in that by below equation, receives power according to described signal, and the power parameter of described main website determines the described transmitting power of described terminal:
Put=Pbt+Pbr_n0+C/N-Pur-10*lg (M)+C1
Wherein, Put is the described transmitting power of described terminal, Pur is that described signal receives power, the power parameter of described main website includes: Pbt is the transmitting power of described main website, Pbr_n0 be when described main website does not have transmitting power main website receive that make an uproar in the end, C/N is the minimum signal to noise ratio of described main website, M is the carrier number of channel, C between described terminal and described main website1For the gain constant between described terminal and described main website.
4. method according to claim 1, it is characterised in that before judging that whether described transmitting power is less than predetermined threshold, also include:
Determining reference value according to the one or more beacon power from satellite, wherein, described reference value is the maximum in one or more beacon power of described satellite;
Current beacon power and described reference value according to described satellite determine described predetermined threshold.
5. method according to claim 4, it is characterised in that by below equation, current beacon power and described reference value according to described satellite determine described predetermined threshold:
B=Px0-Pxr+A-C2
Wherein, B is described predetermined threshold, and Px0 is described reference value, and Pxr is described current beacon power, and A is the threshold value of the described transmitting power of described terminal when being fine day, C2For up-downgoing attenuation constant.
6. method according to any one of claim 1 to 5, it is characterised in that after judging that whether described transmitting power is less than described predetermined threshold, also include:
When judged result is no, forbid the described transmitting power of described terminal is controlled.
7. an output control device, it is characterised in that including:
First determines module, for determining the transmitting power of terminal;
Judge module, is used for judging that whether described transmitting power is less than predetermined threshold;
Control module, for when the judged result of described judge module is for being, the described transmitting power of described terminal being controlled.
8. device according to claim 7, it is characterised in that described first determines that module includes:
Detection unit, the signal receiving main website belonging to described terminal for detecting described terminal receives power;
Determining unit, for receiving power according to described signal, and the power parameter of described main website determines the described transmitting power of described terminal.
9. device according to claim 8, it is characterised in that described determine unit, is additionally operable to by below equation, receives power according to described signal, and the power parameter of described main website determines the described transmitting power of described terminal:
Put=Pbt+Pbr_n0+C/N-Pur-10*lg (M)+C1
Wherein, Put is the described transmitting power of described terminal, Pur is that described signal receives power, the power parameter of described main website includes: Pbt is the transmitting power of described main website, Pbr_n0 be when described main website does not have transmitting power main website receive that make an uproar in the end, C/N is the minimum signal to noise ratio of described main website, M is the carrier number of channel, C between described terminal and described main website1For the gain constant between described terminal and described main website.
10. device according to claim 7, it is characterised in that described device also includes:
Second determines module, and for determining reference value according to the one or more beacon power from satellite, wherein, described reference value is the maximum in one or more beacon power of described satellite;
3rd determines module, for determining described predetermined threshold according to current beacon power and the described reference value of described satellite.
11. device according to claim 10, it is characterised in that the described 3rd determines module, being additionally operable to by below equation, current beacon power and described reference value according to described satellite determine described predetermined threshold:
B=Px0-Pxr+A-C2
Wherein, B is described predetermined threshold, and Px0 is described reference value, and Pxr is described current beacon power, and A is the threshold value of the described transmitting power of described terminal when being fine day, C2For up-downgoing attenuation constant.
12. the device according to any one of claim 7 to 11, it is characterised in that described device also includes:
Disabled module, for when the judged result of described judge module is no, forbidding the described transmitting power of described terminal is controlled.
13. a terminal, it is characterised in that include the device described in any one of claim 7 to 12.
CN201410798057.0A 2014-12-18 2014-12-18 Power control method, device and terminal CN105763241A (en)

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