CN103580733A - Antenna control method and system - Google Patents

Abstract

The invention discloses an antenna control method and system. Multiple sets of attenuation parameters and delay parameters are defined. A plurality of channel responses corresponding to a plurality of remote antenna units of a client device and a base station are obtained. A plurality of channel characteristic values corresponding to the attenuation parameters and the delay parameters are calculated according to the channel responses, and the channel characteristic values reflect the data transmission quantity between the base station and the client device. And selecting and outputting the corresponding attenuation parameter and delay parameter set according to a default channel characteristic value.

Description

Method of controlling antenna and system

Technical field

Invention relates to a kind of method of controlling antenna and system.

Background technology

Along with day by day surging environmental consciousness and the consideration of energy saving economy, mass transportation systems become top-priority important construction.On the Communications service framework of mass transportation systems, adopt at present conventionally in conjunction with the internal network of car and car the two-part service architecture of outer network so that numerous passengers to be provided complete mobile telecommunication service in the single compartment of advancing.

Optical fiber microwave (Radio over Fiber, RoF) technology has been widely used in the poor places of signal receiving quality such as tunnel or building.In recent years, optical fiber microwave technology is more in conjunction with track communication system, first converts microwave signal to light signal and delivers to destination, a distant place and go back to the signal of telecommunication again, therefore can transmit high-frequency signal to compared with decaying fast at a distance and not.In mobile communication, be limited to base station covering scope and the situation that can change hand (Hand Over, Hand Off).Change too frequently hand situation and may cause data transmission efficiency to decline to a great extent, the situation of service even cannot be provided, this phenomenon affects more obvious in high-speed mobile communication.

Because mass transportation systems have the characteristic that predictability moves, further, in track communication system, fixed base platform is suggested to form distributing antenna system (Distributed Antenna System in conjunction with the concept of optical fiber microwave technology, DAS), extensible base station covering scope.Meanwhile, and can reach mobile base station (moving cell) by RF control method and occur to avoid changing the situation of hand.Yet the signal that optical fiber microwave technology transmits in communication system, for frequently, may cause multi-path (multipath) effect.For mobile communcations system, the multi-path effect of time domain can cause the passage on frequency domain to change, and when multi-path possesses again close Energy distribution, impact is more acute.

For instance, when train moves between two remote antenna units (Remote Antenna Unit, RAU), the multi-path situation that possesses close energy easily occurs, and then causes the quality of reception to decline, and is even forced to communication interruption.Employing base station was proposed in conjunction with selecting service antenna to reach single direct-view ripple (Line of Sight, LoS) signal to reduce multi-path effect.In being applied to frequency division multi-task (frequencydomain multiplexing) system, the remote antenna unit that base you control device can select to approach most travelling carriage is as service antenna unit and close other remote antenna units and send and receive signal, reduces multi-path effect.

When cloth is built distributing antenna system, have and proposed base station to the circuit of each remote antenna unit with wiring or added that the mode of electronic delay means compensates into the identical propagation delay time.Yet the above-mentioned practice needs extra optical fiber or electronic delay means.In distributing antenna system, the propagation delay time comprises the signal transmission between optical fiber and air, and signal transmission speed in optical fiber is slow between air; And the fiber lengths using is longer, in permissible pure air, transmit covering scope just less.If want, signal is extended and more needs higher density cloth to build mode; Otherwise, if generally speaking want, promoting single antenna covering scope and can not use longer optical fiber, whole covering scope cannot promote.

Summary of the invention

The object of the invention is to, a kind of method of controlling antenna and system are provided, can effectively solve the multi-path effect problem of antenna system.In addition, the asymmetric antenna system that the present invention proposes, can reduce antenna system and carry out the computational complexity of passage while adjusting, and the cloth of saving antenna system builds up this.

According to the present invention, one implements example, proposes a kind of method of controlling antenna, comprises the following steps.Definition many groups attenuation parameter and delay parameter.Obtain a plurality of channel responses corresponding to a plurality of remote antenna units of a client terminal device and a base station.A plurality of channel characteristics values of calculating corresponding those group attenuation parameters and delay parameter according to those channel responses, those channel characteristics values are reacted the volume of transmitted data between this base station and this client terminal device.According to a default data transmission quantity, select and export corresponding this group attenuation parameter and delay parameter.

According to the present invention, one implements example, proposes a kind of antenna control system, comprises that a measurement module, a control module and postpone and attenuation module.Measurement module obtains a plurality of channel responses corresponding to a plurality of remote antenna units of a client terminal device and a base station.Control module is calculated a plurality of channel characteristics values of corresponding many group attenuation parameters and delay parameter according to those channel responses, those channel characteristics values are reacted the volume of transmitted data between this base station and this client terminal device.Characteristic of correspondence value this group attenuation parameter and delay parameter are selected and exported to control module, according to a default channel characteristic value.Postpone to realize with attenuation module this group attenuation parameter and delay parameter of being exported by this control module.

According to the present invention, one implements example, proposes a kind of antenna control system, comprises that a plurality of remote antenna blocks, a measurement module, a control module and postpone and attenuation module.Each remote antenna block comprises one first remote antenna unit and one second remote antenna unit, and the distance between the first remote antenna unit and a base station is greater than the distance between the second remote antenna unit and this base station.Measurement module obtains a client terminal device corresponding to a plurality of channel responses of those remote antenna units.Control module is calculated a plurality of channel characteristics values of corresponding a plurality of attenuation parameter groups according to those channel responses, those channel characteristics values are reacted the volume of transmitted data between this base station and this client terminal device.Corresponding attenuation parameter group is selected and exported to control module, according to a default channel characteristic value.The attenuation parameter group that wherein attenuation module realization is exported by this control module is to the first remote antenna unit of the plurality of remote antenna block.

Below in conjunction with the drawings and specific embodiments, describe the present invention, but not as a limitation of the invention.

Accompanying drawing explanation

Figure 1A illustrates a communication system, comprising implementing example schematic according to one of ACU antenna control unit of the present invention;

Figure 1B illustrates another communication system, comprising another enforcement example schematic according to ACU antenna control unit of the present invention;

Fig. 1 C illustrates another communication system, comprising another enforcement example schematic according to ACU antenna control unit of the present invention;

Fig. 2 illustrates according to method of controlling antenna one of the present invention and implements exemplary flowchart;

Fig. 3 illustrates the detail flowchart of implementing example according to method of controlling antenna one of the present invention;

Fig. 4 illustrates according to the simple cloth of an enforcement example of antenna control system of the present invention and builds schematic diagram;

Fig. 5 illustrates the detail flowchart according to another enforcement example of method of controlling antenna of the present invention;

Fig. 6 illustrates according to the simple cloth of another enforcement example of antenna control system of the present invention and builds schematic diagram.

Element wherein, Reference numeral

100,100 ', 100 ", 400,600: communication system

120: base station

140,140 ', 140 ": head-end unit

142: measurement module

144: control module

145,161: electrical to optical converter (E/O)

146: antenna control system

147,162: optical-electrical converter (O/E)

148,168: postpone and attenuation module

149: multiplexer

152,165: uplink and downlink signals controller

154: synthesizer

156: splitter

160,160 ': remote antenna unit

163: low noise amplifier

164: power amplifier

166: antenna

167: controller

169: separate multiplexer

170: client terminal device

610,610_1,610_2: remote antenna block

648: attenuation module

Embodiment

The enforcement example of method of controlling antenna proposed by the invention and device, can utilize the transmitting power of remote antenna unit and multi-path effect (multipath effect) problem that solves antenna system time of delay controlled.In addition, the present invention further proposes asymmetric antenna control system, the computational complexity while carrying out passage adjustment to reduce antenna system.

Please refer to Figure 1A, one communication system 100 comprises a base station (Base Station, BS) 120, one client terminal device (subscriber) 170, a head-end unit (Head End Unit, HEU) 140 and a plurality of remote antenna unit (Remote Antenna Unit, RAU) 160.

Wherein the communication between head-end unit 140 and remote antenna unit 160 adopts optical fiber microwave (Radio over Fiber, RoF) technology.Wherein, head-end unit 140, in order to by the down link of base station 120 (Downlink) signal, is distributed and those remote antenna units 160 that lead; Client terminal device 170 up links (Uplink) signal of simultaneously remote antenna unit 160 being collected, synthetic and guiding base station 120.

Head-end unit 140 comprises a uplink and downlink signals controller 152, a splitter 156, a synthesizer 152, many electricals to optical converter (E/O) 145, many optical-electrical converters (O/E) 147.Remote antenna unit 160 comprises optical-electrical converter 162, one electrical to optical converter 161, one power amplifiers 164, a low noise amplifier 163, a uplink and downlink signals switch 165 and an antenna 166.

The down link signal that uplink and downlink signals controller 152 sends base station 120 is directed to splitter 156, then according to actual antennas cloth, build demand, corresponding those remote antenna unit 160 quantity of downstream signal are divided into many group signals with splitter 156, through electrical to optical converter (E/O) 145, convert light territory signal to and deliver to should remote antenna unit 160 via optical fiber.Head-end unit 140 is passed on the light territory signal of base station down link signal, and optical-electrical converter 162 converts electric territory signal to, after power amplifier 164 amplifying powers, is directed to antenna 166 sends through uplink and downlink signals controller 165.

Client terminal device 170 uplink signals that those remote antenna units 160 are collected through antenna 166, after uplink and downlink signals controller 165 is directed to low noise amplifier 163 and amplifies, through electrical to optical converter 161, convert light territory signal to and deliver to should head-end unit 140 via optical fiber.Optical-electrical converter 147 convert to uplink signal that light territory signal passes on through synthesizer 152 and other remote antenna units 160 again synthetic after, utilize uplink and downlink signals controller 152 guiding base stations 120.

Wherein, uplink and downlink signals controller 152 can circulator (Circulator) or the switch (Switch) that is controlled by base station implement; And uplink and downlink signals controller 165 can circulator (Circulator) or the switch (Switch) that is controlled by downlink signal power detector implement.

Figure 1A comprises that antenna control system 146 at least comprises a measurement module 142, a plurality of delay and attenuation module 148 and a control module 144 according to antenna control system 146 1 enforcement example schematic of the present invention.In Figure 1A, postponing with attenuation module 148 is to be implemented in head-end unit 140 for example describes, and is so not limited to this.Measurement module 142 obtains client terminal device 170 and a plurality of channel responses of base station 120 corresponding to a plurality of remote antenna units 160.Measurement module 142 can obtain those channel responses by a plurality of uplink signals based on by uplink and downlink signals controller 152 reference one sequential reference signals (timing epoch) and those remote antenna units 160, and each channel response comprises a signal strength values a and a delay time T.This timing reference signal can be the frame initial time of a gps signal or down link.A plurality of delays a plurality of remote antenna units 160 corresponding to attenuation module 148, realize corresponding one group of attenuation parameter and the delay parameter postponing with the remote antenna unit 160 of attenuation module 148 of control module 144 output.

Control module 144 definition many groups attenuation parameter (attenuation candidate) A and delay parameter (delay candidate) Δs, each group attenuation parameter A is comprised of a plurality of decay element α and distinguishes corresponding those remote antenna units 160, and a plurality of decay element α numerical value can be defined and be obtained by the available equipment energy characteristic of system element; In like manner, each group delay parameter delta is comprised of a plurality of decay element δ and distinguishes corresponding those remote antenna units 160, and a plurality of decay element δ numerical value can be defined and be obtained by the available equipment energy characteristic of system element.Control module 144 is calculated a plurality of channel characteristics values of corresponding those group attenuation parameters and delay parameter according to those channel responses.Wherein, channel characteristics value such as for r.m.s., postpone extension (Root Mean Square delay spread), average excess delay (Mean Excess Delay) or to peak signal difference at 3dB with interior channel response time of delay relevant with it etc., as long as the volume of transmitted data (channel transfer quality state) that channel characteristics value energy reactive group platform 120 and client terminal device (subscriber) are 170, as the intensity of variation of frequency response.For instance, r.m.s. postpones that extension is less, and volume of transmitted data that base station 120 and client terminal device are 170 is higher, channel transfer quality state is better.It is example explanation that following channel characteristics value adopts r.m.s. to postpone extension, is so not limited to this.

Control module 144 also can be in response to system demand, selects and export one group of attenuation parameter A and the delay parameter delta of correspondence according to a default channel characteristic value.This default channel characteristic value is to react, for example, and a better volume of transmitted data or the maximum data transmission quantity.Control module 144 can be selected and export, and for example, corresponding minimum r.m.s. postpones this group attenuation parameter A and delay parameter delta of extension.By postponing to reach with attenuation module 148 time and size of controlling remote antenna unit 160 signal transmittings.

In addition, postpone also can be placed in remote antenna unit with attenuation module 148, please refer to Figure 1B, it illustrates a communication system 100 ', comprising another enforcement example schematic according to antenna control system 146 of the present invention.A plurality of delays of remote antenna unit 160 ' realize with attenuation module 168 attenuation parameter and the delay parameter that control module 144 is exported the remote antenna unit 160 ' of corresponding delay and attenuation module 168.One group of attenuation parameter of the corresponding remote antenna unit 160 ' of control module 144 output and delay parameter, be converted to an appropriate format control signal if centre frequency is in compared with the amplitude-modulated signal of low frequency, by multiplexer 149 and down link signal, integrate, by electrical to optical converter 145 (E/O), be transferred to the optical-electrical converter 162 (O/E) of remote antenna unit 160 ', through the separated appropriate format control signal of a solution multiplexer 169 and down link signal.This appropriate format control signal is replied as this group attenuation parameter and delay parameter, control lag and attenuation module 168 through a controller 167.

Please refer to Fig. 1 C, it illustrates a communication system 100 ", comprising implementing example schematic according to antenna control system 146 ' of the present invention.Antenna control system 146 ' comprising: measurement module 142, one control modules 144, a plurality of attenuation module 648, and a plurality of remote antenna block 610.1C figure is a kind of framework of asymmetric distribution formula antenna system.

A plurality of remote antenna blocks 610, each remote antenna block 610 comprises one first remote antenna unit 160 and one second remote antenna unit 160, and the distance that this first remote antenna unit 160 and this base station are 120 is greater than the distance of 120 of this second remote antenna unit 160 and this base stations.Measurement module 142 is in order to obtain a client terminal device corresponding to a plurality of channel responses of those remote antenna units.Control module 144, in order to calculate a plurality of channel characteristics values of corresponding a plurality of attenuation parameters according to those channel responses, those channel characteristics values are reacted the volume of transmitted data between this base station and this client terminal device, and select and export the attenuation parameter of a corresponding default channel characteristic value.A plurality of attenuation module 648, in order to realize this first remote antenna unit 160 in corresponding those remote antenna blocks 610 of those attenuation parameters of control module 144 output.Please refer to Fig. 2, it illustrates the method for controlling antenna flow chart of implementing example according to the present invention one.In step S200, definition many groups attenuation parameter A and delay parameter delta.Each group attenuation parameter A is comprised of a plurality of decay element α and distinguishes corresponding those remote antenna units 160, and a plurality of decay element α numerical value can be defined and be obtained by the available equipment energy characteristic of system element; In like manner, each group delay parameter delta is comprised of a plurality of decay element δ and distinguishes corresponding those remote antenna Unit 160, and a plurality of decay element δ numerical value herein can be defined and be obtained by the available equipment energy characteristic of system element.

In step S210, measuring unit 142 obtains a plurality of channel responses corresponding to a plurality of remote antenna units 160 of a client terminal device and a base station 120, and each channel response comprises a signal strength values a and a delay time T.In step S220, control unit 144 calculates a plurality of channel characteristics values of corresponding those group attenuation parameters and delay parameter according to those channel responses, the volume of transmitted data (channel transfer quality state) between these channel characteristics value reactive group platforms 120 and client 170 devices.In step S230, corresponding this group attenuation parameter and delay parameter are selected and exported to control unit 144, according to a default channel characteristic value.

Next client terminal device is hereby discussed and is positioned at a covering scope C mono-ad-hoc location p of base station 120 and the situation that base station corresponds to M remote antenna unit 160.Please refer to Fig. 3, it illustrates the detail flowchart according to the method for controlling antenna of an enforcement example.In step S300, definition many groups attenuation parameter A and delay parameter delta.Each group attenuation parameter A is by a plurality of decay element α _kform and correspond respectively to k remote antenna 160, a plurality of decay element α _knumerical value can be defined and be obtained by the available equipment energy characteristic of system element; In like manner, each group delay parameter delta is by a plurality of decay element δ _kform and correspond respectively to k remote antenna unit 160, the plurality of decay element δ _knumerical value can be defined and be obtained by the available equipment energy characteristic of system element, the positive integer that k is 1 ~ M.In step S310, when measurement module 142 obtains client terminal device 170 and is positioned at this ad-hoc location p, corresponding to the channel response of k remote antenna unit 160, this channel response comprises a signal strength values ap, k and a delay time T p, k, the positive integer that k is 1 ~ M.

In step S322, each group attenuation parameter and delay parameter of substitution one by one.In step S324, control module 144 is calculated when client terminal device 170 is positioned at ad-hoc location p according to those channel responses (ap, k and τ p, k), the channel characteristics value σ p of corresponding step S322 this group attenuation parameter A of substitution of institute and delay parameter delta, as shown in formula (1).Channel characteristics value σ p can react when client terminal device 170 is positioned at ad-hoc location p, the volume of transmitted data (channel transfer quality state) between base station 120 and client 170 devices.

${\mathrm{\&sigma;}}_p(A,\mathrm{\&Delta;})=\sqrt{{\left[\frac{{\mathrm{\&Sigma;}}_k\left(\frac{a_{p,\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA00001952436800061.png"\; state="\{\{state\}\}">k</figure-callout>}}^2}{{\mathrm{\&alpha;}}_k}\right)({\mathrm{\&tau;}}_{p,k}+{\mathrm{\&delta;}}_k)}{{\mathrm{\&Sigma;}}_k\left(\frac{a_{p,\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA00001952436800061.png"\; state="\{\{state\}\}">k</figure-callout>}}^2}{{\mathrm{\&alpha;}}_k}\right)}\right]}^2-\frac{{\mathrm{\&Sigma;}}_k\left(\frac{a_{p,\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA00001952436800061.png"\; state="\{\{state\}\}">k</figure-callout>}}^2}{{\mathrm{\&alpha;}}_k}\right){({\mathrm{\&tau;}}_{p,k}+{\mathrm{\&delta;}}_k)}^2}{{\mathrm{\&Sigma;}}_k\left(\frac{a_{p,\mathrm{<figure-callout\; id="2"\; label="k"\; filenames="HDA00001952436800061.png"\; state="\{\{state\}\}">k</figure-callout>}}^2}{{\mathrm{\&alpha;}}_k}\right)}}---\left(1\right)$

In step S326, judge whether channel characteristics value σ p surpasses an acquiescence threshold value (default channel characteristic value), and acquiescence threshold value by testing decision, for example, is 2.5 μ s.

When channel characteristics σ p does not surpass acquiescence threshold value,, in step S330, this group attenuation parameter corresponding to channel characteristics value that does not surpass acquiescence threshold value selected and exported to control module 144

with delay parameter

when postponing with attenuation module 148 to realize this group attenuation parameter and delay parameter, improving client terminal device 170 to be positioned at ad-hoc location p and the channel transfer quality of 120 of base stations.When channel characteristics σ p surpasses acquiescence threshold value, in step S327, control module 144 is found out better channel characteristics value corresponding this group attenuation parameter Ap and delay parameter delta p, and in step S328, judges whether each group attenuation parameter and all substitutions of delay parameter.If not, get back to step S322 and carry out iterative operation.If so, subsequent steps S330, this group attenuation parameter corresponding to a better channel characteristics value selected and exported to control module 144

with delay parameter

channel transfer quality when postponing and attenuation module 148, improving client terminal device 170 to be positioned at ad-hoc location p.In an enforcement example, this better channel characteristics value is a smallest passage characteristic value, and step S322 ~ S330 can represent by formula (2), and wherein T σ is preset threshold value.

$({\hat{A}}_p,{\widehat{\mathrm{\&Delta;}}}_p)=\underset{A,\mathrm{\&Delta;}}{\arg }\{{\mathrm{\&sigma;}}_p(A,\mathrm{\&Delta;})<T_{\mathrm{\&sigma;}}\}\mathrm{or}\underset{A,\mathrm{\&Delta;}}{\arg \min }\left\{{\mathrm{\&sigma;}}_p(A,\mathrm{\&Delta;})\right\}---\left(2\right)$

Please refer to Fig. 4, it illustrates and comprises that the simple cloth of signal transmission path of implementing a communication system 400 of example according to antenna control system of the present invention builds schematic diagram.By Fig. 4, explain that the antenna control system in Figure 1A, Figure 1B applies above-mentioned method of controlling antenna, based on client terminal device 170, be positioned at the viewpoint of an ad-hoc location p, find out this group attenuation parameter and delay parameter of the channel characteristics value of a plurality of remote antenna units 160 of goodization, then control transmitting power and the time of delay of remote antenna unit 160, channel transfer quality when improving client terminal device 170 and being positioned at covering scope C, therefore can solve the message transmission rate decline problem causing because of multi-path effect in distributing antenna system.In Fig. 4, each postpones for example by delay element DLY and attenuating elements ATT, to be composed in series with attenuation module 148.

Next client terminal device 170 is hereby discussed and is positioned at the arbitrary position of covering scope of base station 120 and the situation that base station corresponds to M those remote antenna units 160.Please refer to Fig. 5, it illustrates the detail flowchart according to an example of the method for controlling antenna of another enforcement example of the present invention.In step S500, definition many groups attenuation parameter A and delay parameter delta, each group attenuation parameter A is by a plurality of decay element α _kform and correspond respectively to k remote antenna 160, the plurality of decay element α _knumerical value is defined and is obtained by the available equipment energy characteristic of system element; In like manner, each group delay parameter delta is by a plurality of decay element δ _kform and correspond respectively to k remote antenna 160, the plurality of decay element δ _knumerical value is defined and is obtained by the available equipment energy characteristic of system element, the positive integer that k is 1 ~ M.In step S510, when measurement module 142 obtains client terminal device 170 and is positioned at arbitrary position p, corresponding to the channel response of k remote antenna unit 160, channel response comprises a signal strength values ap, k and a delay time T p, k, the positive integer that k is 1 ~ M.

In step S522, each group attenuation parameter and delay parameter of substitution one by one.In step S524, control module 144 is according to those channel responses (ap, k and τ p, k) calculate when client terminal device 170 is positioned at the arbitrary position p of covering scope C, the channel characteristics value σ p of corresponding step S522 this group attenuation parameter A of substitution of institute and delay parameter delta, as shown in formula (1).Channel characteristics value σ p can react when client terminal device 170 is positioned at the arbitrary position p of covering scope C, the volume of transmitted data (channel transfer quality state) between base station 120 and client terminal device 170 devices.

In step S526, computing client end device 170 is evenly distributed in the arbitrary position p of covering scope C, and those channel characteristics values σ p is greater than the probability P of an acquiescence threshold value (default channel characteristic value), as shown in formula (3), wherein, T _σthe preset threshold value that the experiment of serving as reasons determines is for example 2.5 μ s.

$P[{\mathrm{\&sigma;}}_p(A,\mathrm{\&Delta;})>T_{\mathrm{\&sigma;}}|p\&Element;C]=\frac{\mathrm{number\; of\; p}\&Element;\{{\mathrm{\&sigma;}}_p(A,\mathrm{\&Delta;})>T_{\mathrm{\&sigma;}}\}}{\mathrm{number\; of\; p}\&Element;C}---\left(3\right)$

In step S527, control module 144 is found out this group attenuation parameter that minimum probability is corresponding

with delay parameter

and in step S528, judge whether each group attenuation parameter and all substitutions of delay parameter.If not, get back to step S522 and carry out iterative operation.If so, subsequent steps S530, this group attenuation parameter that minimum probability is corresponding is selected and exported to control module 144

with delay parameter

to postponing and attenuation module 148, while being positioned at covering scope C to improve client terminal device 170 and the channel transfer quality of 120 of base stations.Step S522 ~ S530 Essential Action can represent by formula (4).

$(\hat{A},\widehat{\mathrm{\&Delta;}})=\underset{A,\mathrm{\&Delta;}}{\arg \min }\left\{P\right[{\mathrm{\&sigma;}}_p(A,\mathrm{\&Delta;})>T_{\mathrm{\&sigma;}}|p\&Element;C]\}---\left(4\right)$

Above-mentioned method of controlling antenna, based on client terminal device 170, be positioned at the viewpoint of covering scope C, when finding out goodization client terminal device 170 and being positioned at covering scope C and 120 channel characteristics values of base station be greater than this group attenuation parameter and delay parameter of the probability of acquiescence threshold value, then control transmitting power and the time of delay of adjusting remote antenna unit 160, when improving client terminal device 170 and being positioned at covering scope C and the transmission quality of 120 of base stations, therefore can solve the message transmission rate decline problem causing because of multi-path effect in distributing antenna system.If environment is difficult for change, in the antenna system 100 of Figure 1B, can directly set delay and attenuation module 168 according to attenuation parameter and delay parameter, and omit multiplexer 149, separate multiplexer 169 and controller 167.

In addition, as shown in Figure 6, it illustrates another the simple cloth of signal transmission path of implementing a communication system 600 of example comprising according to antenna system of the present invention and builds schematic diagram.By the antenna control system in Fig. 6 key-drawing 1C, apply above-mentioned method of controlling antenna.Communication system 600 comprises a base station 120, a plurality of remote antenna block 610_1 and 610_2, a measurement module (not being illustrated in figure), a control module (not being illustrated in figure) and attenuation module 648 (being comprised of a plurality of attenuating elements).Each remote antenna block 610 comprises a remote antenna unit and another remote antenna unit, and the distance that a remote antenna unit and base station are 120 is greater than the distance of 120 of another remote antenna unit and base stations.

The effect of measurement module and control module is with described in above-mentioned method of controlling antenna, according to a default channel characteristic value, and the attenuation parameter of the better channel characteristics value of final decision correspondence.Attenuation module realizes the attenuation parameter of corresponding smaller channels characteristic value to those the first remote antenna units, for example, be remote antenna unit 2 and 3.The remote antenna block 610_1 of take explains as example, and the distance that remote antenna unit 2 and base station are 120 is greater than the distance of 120 of remote antenna unit 3 and base stations, is also that the signal propagation delay time of remote antenna unit 2 between optical fiber is longer.Therefore, with the attenuation module 648 being formed by attenuating elements ATT2, apply attenuation parameter to reduce the transmitting power of remote antenna unit 2, and maintain the transmitting power of remote antenna unit 3.So in the situation that not needing to adjust delay parameter, the multi-path effect of distributed antenna system 600 is slowed down.And observe Fig. 6, can learn, in single remote antenna block middle distance base station 120 its transmitting power of remote antenna unit far away, can be attenuated.

The method of controlling antenna that the above-mentioned enforcement example of the present invention is invented and the enforcement example of device, according to a default channel characteristic value, when finding out goodization client terminal device 170 and being positioned at covering scope C and 120 channel characteristics values of base station, and control according to this transmitting power and the time of delay of remote antenna unit, can effectively solve the multi-path effect problem of antenna system.In addition, the present invention also further proposes asymmetric antenna system, reduce antenna system and carry out the computational complexity of passage while adjusting, and the cloth of saving antenna system builds up this.

Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (19)

1. An antenna control method, characterized in that, comprising: Define multiple sets of attenuation parameters and delay parameters; obtaining a plurality of channel responses corresponding to a plurality of remote antenna units of a client device and a base station; calculating a plurality of channel eigenvalues corresponding to the sets of attenuation parameters and delay parameters according to the channel responses, the channel eigenvalues reflecting the amount of data transmission between the base station and the client device; and According to a default channel characteristic value, select and output the corresponding set of attenuation parameters and delay parameters. 2. The antenna control method according to claim 1, wherein the channel responses are obtained based on a timing reference signal and a plurality of uplink signals of the remote antenna units, and each channel response includes a signal strength value and a delay time. 3. The antenna control method according to claim 1, wherein the client device is located at a specific location within a coverage area of the base station, and the step of obtaining the channel responses comprises: obtaining when the client device The channel responses corresponding to the remote antenna units when the device is located at the specific location. 4. The antenna control method according to claim 3, wherein the step of calculating the channel eigenvalues comprises: The channel characteristic values corresponding to the sets of attenuation parameters and delay parameters are calculated according to the channel responses when the client device is located at the specific location. 5. The antenna control method according to claim 4, wherein the default channel characteristic value is a default threshold value, and the step of selecting and outputting comprises: judging whether the characteristic values of the channels all exceed the preset threshold; and When one of the channel feature values does not exceed the preset threshold value, select and output the set of attenuation parameters and delay parameters corresponding to the channel feature value not exceeding the default threshold value. 6. The antenna control method according to claim 5, wherein the step of selecting and outputting further comprises: When the channel characteristic values all exceed the default threshold, select and output the set of attenuation parameters and delay parameters corresponding to the channel characteristic values corresponding to the predetermined data transmission amount. 7. The antenna control method according to claim 1, wherein the client device is located at any location within a coverage area of the base station, and the step of obtaining the channel responses comprises: obtaining when the client device The channel responses corresponding to the remote antenna units when the end device is located at any position within the coverage area. 8. The antenna control method according to claim 7, wherein the step of calculating the channel eigenvalues comprises: The channel characteristic values corresponding to the sets of attenuation parameters and delay parameters are calculated according to the channel responses when the client device is located at any position within the coverage range. 9. The antenna control method according to claim 8, wherein the default channel characteristic value is a default threshold value, and the step of selecting and outputting comprises: calculating the probability that the characteristic values of the channels corresponding to each set of attenuation parameters and delay parameters are greater than a default threshold; and The set of attenuation parameters and delay parameters corresponding to the minimum values of the probabilities are selected and output. 10. An antenna control system, comprising: A measurement module, used to obtain a plurality of channel responses corresponding to a plurality of remote antenna units of a client device and a base station; A control module, used to calculate a plurality of channel characteristic values corresponding to multiple sets of attenuation parameters and delay parameters according to the channel responses, the channel characteristic values reflect the data transmission volume between the base station and the client device, and according to a Default channel eigenvalues, select and output the corresponding set of attenuation parameters and delay parameters; and A plurality of delay and attenuation modules are used to realize the set of attenuation parameters and delay parameters output by the control module. 11. The antenna control system according to claim 10, wherein the measurement module obtains the channel responses based on a timing reference signal and a plurality of uplink signals of the remote antenna units, and each channel response includes a Signal strength value and a delay time. 12. The antenna control system according to claim 10, wherein the client device is located at a specific location within a coverage area of the base station, and the measurement module obtains corresponding The channel responses of the remote antenna units. 13. The antenna control system according to claim 12, wherein the control module calculates the attenuation parameters and delay parameters corresponding to the sets of attenuation parameters and delay parameters when the client device is located at the specific location according to the channel responses Channel eigenvalues. 14. The antenna control system according to claim 13, wherein the default channel feature value is a default threshold value, and the control module judges whether the channel feature values exceed the preset threshold value, when the channel If one of the characteristic values does not exceed the preset threshold value, the control module selects and outputs the group of attenuation parameters and delay parameters corresponding to the channel characteristic value not exceeding the default threshold value. 15. The antenna control system according to claim 14, wherein when the channel characteristic values all exceed the default threshold value, the control module selects and outputs the group corresponding to the channel characteristic value corresponding to the predetermined data transmission amount Decay parameters and delay parameters. 16. The antenna control system according to claim 10, wherein the client device is located at any location within a coverage area of the base station, and the measurement module obtains when the client device is located at any location within the coverage area. A location corresponds to the channel responses of the remote antenna units. 17. The antenna control system according to claim 16, wherein the control module calculates, according to the channel responses, when the client device is located at any position within the coverage area, the corresponding sets of attenuation parameters and delays The channel eigenvalues of the parameters. 18. The antenna control system according to claim 17, wherein the default channel eigenvalue is a default threshold value, and the control module calculates the channel eigenvalues corresponding to each set of attenuation parameters and delay parameters greater than the The probability of the default threshold value, and the control module selects and outputs the group of attenuation parameters and delay parameters corresponding to the minimum value of the probability. 19. An antenna control system, comprising: A plurality of remote antenna blocks, each remote antenna block includes a first remote antenna unit and a second remote antenna unit, the distance between the first remote antenna unit and a base station is greater than the distance between the second remote antenna unit and the distance between base stations; A measurement module, used to obtain a plurality of channel responses of a client device corresponding to the remote antenna units; and A control module, used to calculate a plurality of channel characteristic values corresponding to a plurality of attenuation parameter sets according to the channel responses, the channel characteristic values reflect the data transmission volume between the base station and the client device, and are based on a default channel Eigenvalue, select and output the corresponding attenuation parameter group; Wherein the plurality of attenuation modules are used to implement the attenuation parameter set output by the control module to the first remote antenna units of the plurality of remote antenna blocks.

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