TWI489838B - Antenna control method and system thereof - Google Patents

Description

Antenna control method and system

The field of the invention relates to an antenna control method and system.

With the increasing awareness of environmental protection and the consideration of energy-saving economy, the mass transit system has become an important construction priority. In the communication service architecture of the mass transit system, a two-stage service architecture combining the in-vehicle network and the vehicle's external network is usually adopted to provide a complete mobile communication service for a large number of passengers in a single traveling vehicle.

Radio over fiber (RoF) technology has been widely used in places with poor reception quality such as tunnels or buildings. In recent years, fiber-optic microwave technology has been combined with the track communication system to convert the microwave signal into an optical signal and send it to a distant destination and then back to the electrical signal. Therefore, the high-frequency signal can be transmitted to a long distance without rapid attenuation. In mobile communications, Hand Over (Hand Off) occurs when the coverage of the base station is limited. Too often a handicap situation may result in a significant drop in data transmission performance or even a service failure. This phenomenon is more pronounced in high-speed mobile communications.

Due to the predictable mobility of the mass transit system, further, in the orbit communication system, the concept of fixed base station combined with fiber-optic microwave technology is proposed to form a distributed antenna system (DAS), an extendable base. The coverage of the station. At the same time, a moving cell can be achieved through the radio frequency control method to avoid the situation of changing hands. However, the fiber-optic microwave technology transmits information in the communication system. The number is the same frequency and may result in a multipath effect. For mobile communication systems, the multipath effect of the time domain causes channel changes in the frequency domain, and the effects are more pronounced when multiple paths have similar energy distributions.

For example, when a train moves between two Remote Antenna Units (RAUs), multiple paths with similar energies are prone to occur, resulting in reduced reception quality and even forced communication interruption. It has been proposed to use a base station combined with a selective service antenna to achieve a single Line of Sight (LoS) signal to reduce multiple path effects. When applied to a frequency domain multiplexing system, the base station control device selects the remote antenna unit closest to the mobile station as the serving antenna unit and turns off the other remote antenna unit to transmit and receive signals, thereby reducing the multipath effect.

In deploying a decentralized antenna system, it has been proposed to compensate the same transmission delay time by wiring the base station to each remote antenna unit by wiring or by adding an electronic delay device. However, the above approach requires additional fiber optic or electronic delay devices. The transmission delay time in a decentralized antenna system involves the signal transmission between the fiber and the air, and the transmission speed of the signal in the fiber is slower than that between the air. The longer the length of the fiber used, the smaller the transmission range in the allowable pure air. . If you want to extend the signal farther, you need a higher density deployment method. On the contrary, if you want to increase the coverage of a single antenna, you can't use a longer fiber. The overall coverage is not improved.

According to an embodiment of the present disclosure, an antenna control method is provided. The following steps are included. Define multiple sets of attenuation parameters and delay parameters. Obtaining a plurality of channel responses of a client device and a base station corresponding to the plurality of remote antenna units. And calculating, according to the channel responses, a plurality of channel feature values corresponding to the group of attenuation parameters and delay parameters, the channel feature values reflecting a data transmission amount between the base station and the client device. The corresponding set of attenuation parameters and delay parameters are selected and output according to a preset data transmission amount.

According to an embodiment of the present disclosure, an antenna control system is provided, including a measurement module, a control module, and a delay and attenuation module. The measurement module acquires a plurality of channel responses of a client device and a base station corresponding to the plurality of remote antenna units. The control module calculates a plurality of channel feature values corresponding to the plurality of sets of attenuation parameters and delay parameters according to the channel responses, and the channel feature values reflect a data transmission amount between the base station and the client device. The control module selects and outputs the corresponding characteristic value of the set of attenuation parameters and delay parameters according to a preset channel characteristic value. The delay and attenuation module implements the set of attenuation parameters and delay parameters output by the control module.

According to an embodiment of the present disclosure, an antenna control system is provided, including a plurality of remote antenna blocks, a measurement module, a control module, and a delay and attenuation module. Each of the remote antenna blocks includes a first remote antenna unit and a 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 the base station distance. The measurement module acquires a plurality of channel responses of the client device corresponding to the remote antenna units. The control module calculates a plurality of channel feature values corresponding to the plurality of attenuation parameter groups according to the channel responses, and the channel feature values reflect the data transmission amount between the base station and the client device. The control module selects and outputs a corresponding attenuation parameter group according to a preset channel characteristic value. Decay The subtraction module implements the attenuation parameter set output by the control module to the first remote antenna unit of the plurality of remote antenna blocks.

In order to better understand the above and other aspects of the present disclosure, a number of embodiments will be described hereinafter with reference to the accompanying drawings, which are described in detail below:

The implementation example of the antenna control method and apparatus proposed by the present disclosure can solve the multipath effect problem of the antenna system by controlling the transmit power and delay time of the remote antenna unit. In addition, the present disclosure further proposes an asymmetric antenna control system to reduce the computational complexity of the antenna system for channel adjustment.

Referring to FIG. 1A, a communication system 100 includes a base station (BS) 120, a subscriber 170, a Head End Unit (HEU) 140, and a plurality of remote antenna units ( Remote Antenna Unit, RAU) 160.

The communication between the head end unit 140 and the remote antenna unit 160 uses a radio over fiber (RoF) technology. The head end unit 140 is configured to allocate and direct the Downlink signal of the base station 120 to the remote antenna units 160; and simultaneously collect the uplink of the UE device 170 collected by the remote antenna unit 160 (Uplink) The signal is synthesized and directed to the base station 120.

The head end unit 140 includes an uplink and downlink signal controller 152, a diplexer 156, a synthesizer 152, a multi-optical converter (E/O) 145, and a multi-opto-electrical converter (O/E) 147. The remote antenna unit 160 includes a photoelectric converter 162, an electro-optic converter 161, a power amplifier 164, and a low noise amplifier. 163. An uplink and downlink signal switch 165 and an antenna 166.

The uplink and downlink signal controller 152 directs the downlink signal sent by the base station 120 to the splitter 156, and then divides the downlink signal to the number of the remote antenna units 160 by the splitter 156 according to the actual antenna deployment requirements. The plurality of sets of signals are converted into optical domain signals via an optical to optical converter (E/O) 145 and sent to the corresponding remote antenna unit 160 via the optical fiber. The head end unit 140 forwards the optical domain signal of the base station downlink signal, and the photoelectric converter 162 converts the electric field signal into a electric field signal. After the power is amplified by the power amplifier 164, the signal is transmitted to the antenna 166 via the uplink and downlink signal controller 165.

The uplink signal of the user equipment 170 collected by the remote antenna unit 160 via the antenna 166 is led to the low noise amplifier 163 by the uplink and downlink signal controller 165, and then converted into the optical domain signal by the electro-optical converter 161. It is sent to the corresponding head unit 140 via the optical fiber. The photoelectric converter 147 converts the optical signal into an optical signal and combines it with the uplink signals forwarded by the other remote antenna unit 160, and then uses the uplink and downlink signal controller 152 to guide the base station 120.

The uplink and downlink signal controller 152 can be implemented by a Circulator or a switch controlled by a base station; and the uplink and downlink signal controller 165 can be circulator or controlled by downlink signal power. The switch of the detector is implemented by a switch.

FIG. 1A includes a schematic diagram of an embodiment of an antenna control system 146 according to the present disclosure. The antenna control system 146 includes at least one measurement module 142, a plurality of delay and attenuation modules 148, and a control module 144. The delay and attenuation module 148 in FIG. 1A is described by taking the head end unit 140 as an example, but is not limited thereto. The measurement module 142 acquires a plurality of channel responses of the client device 170 and the base station 120 corresponding to the plurality of remote antenna units 160. The measurement module 142 can obtain the channel response based on a timing epoch obtained by the uplink and downlink signal controller 152 referring to a GPS signal and a plurality of uplink signals of the remote antenna units 160. Each channel response includes a signal strength value a and a delay time τ . The plurality of delay and attenuation modules 148 correspond to the plurality of remote antenna units 160, and the control module 144 outputs a set of attenuation parameters and delay parameters of the remote antenna unit 160 of the corresponding delay and attenuation module 148.

The control module 144 defines a plurality of sets of attenuation candidates A and delay candidates Δ. Each set of attenuation parameters A is composed of a plurality of attenuation elements α and respectively corresponds to the remote antenna units 160, and multiple attenuations. The element alpha value can be defined by the device characteristics that can be provided by the system component; for the same reason, each set of delay parameters Δ is composed of a plurality of delay elements δ and respectively correspond to the remote antenna elements 160, and the plurality of delay elements δ values can be determined by the system. The device characteristics that the component can provide are defined. The control module 144 calculates a plurality of channel feature values corresponding to the set of attenuation parameters and delay parameters according to the channel responses. The channel feature value is, for example, a Root Mean Square delay spread, a Mean Excess Delay, or a channel response within 3 dB of the strongest signal difference, and a delay time thereof, as long as the channel characteristics The value can reflect the amount of data transmission (channel transmission quality status) between the base station 120 and the subscriber station 170, such as the degree of change in the frequency response. For example, the smaller the delay per square root delay, the higher the data transmission between the base station 120 and the client device 170, and the better the channel transmission quality state. The following channel feature values are described by taking the rms delay spread as an example, but are not limited thereto.

The control module 144 can also select and output a corresponding set of attenuation parameters A and delay parameters Δ according to a preset channel characteristic value in response to system design requirements. The preset channel characteristic value is reactive, for example, a preferred data transmission amount or a maximum data transmission amount. The control module 144 can select and output, for example, the set of attenuation parameters A and delay parameters Δ corresponding to the minimum rms delay spread. The time and magnitude of signal transmission by the remote antenna unit 160 is controlled by the delay and attenuation module 148.

In addition, the delay and attenuation module 148 can also be placed in the remote antenna unit. Referring to FIG. 1B, a communication system 100' is illustrated, including a schematic diagram of another embodiment of the antenna control system 146 in accordance with the present disclosure. The plurality of delay and attenuation modules 168 of the remote antenna unit 160' implement the control module 144 to output the attenuation parameters and delay parameters of the remote antenna unit 160' of the corresponding delay and attenuation module 168. The control module 144 outputs a set of attenuation parameters and delay parameters corresponding to the remote antenna unit 160', and converts it into an appropriate format control signal, such as a center frequency of the amplitude modulation signal at a lower frequency, through the multiplexer 149 and the downlink signal. The integrated, optical-to-electric converter 145 (E/O) is transmitted to the optical converter 162 (O/E) of the remote antenna unit 160', and the appropriate format control signal and downlink signal are separated by a demultiplexer 169. The appropriate format control signal is replied to by the controller 167 as the set of attenuation parameters and delay parameters, and the delay and attenuation module 168 is controlled.

Please refer to FIG. 1C , which illustrates a communication system 100 ′′, including an embodiment of an antenna control system 146 ′ according to the disclosure. The antenna control system 146 ′ includes: a measurement module 142 and a control module 144 . A plurality of attenuation modules 648, and a plurality of remote antenna blocks 610. Figure 1C is an architecture of an asymmetric distributed antenna system.

a plurality of remote antenna blocks 610, each of which includes a first remote antenna unit 160 and a second remote antenna unit 160. The first remote antenna unit 160 and the base station 120 The distance is greater than the distance between the second remote antenna unit 160 and the base station 120. The measurement module 142 is configured to acquire a plurality of channel responses of the client device corresponding to the remote antenna units. The control module 144 is configured to calculate, according to the channel responses, a plurality of channel feature values corresponding to the plurality of attenuation parameters, wherein the channel feature values reflect a data transmission amount between the base station and the client device, and select and output corresponding The attenuation parameter of a preset channel characteristic value. The plurality of attenuation modules 648 are configured to implement the attenuation parameters output by the control module 144 for the first remote antenna unit 160 in the remote antenna block 610. Please refer to FIG. 2 , which is a flowchart of an antenna control method according to an embodiment of the disclosure. In step S200, a plurality of sets of attenuation parameters A and delay parameters Δ are defined. Each set of attenuation parameters A is composed of a plurality of attenuation elements α and respectively corresponding to the remote antenna elements 160, and the plurality of attenuation elements α values can be defined by the device characteristics that can be provided by the system components; similarly, each group of delay parameters Δ consists of a plurality of attenuation elements δ and corresponds to the respective distal antenna 160 units, where the plurality of attenuation element δ values can be defined by the device characteristics that the system components can provide.

In step S210, the measuring unit 142 acquires a plurality of channel responses of a client device and a base station 120 corresponding to the plurality of remote antenna units 160, and each channel response includes a signal intensity value a and a delay time τ. . In step S220, the control unit 144 calculates a plurality of channel feature values corresponding to the group of attenuation parameters and delay parameters according to the channel responses, and the channel feature values reflect the data transmission amount between the base station 120 and the user terminal 170. Transmission quality status). In step S230, the control unit 144 selects and outputs the corresponding set of attenuation parameters and delay parameters according to a preset channel characteristic value.

Next, it will be discussed that the client device is located at a specific location p within one of the base stations 120 covering the range C and the base station corresponds to the M remote antenna units 160. Please refer to FIG. 3, which illustrates a detailed flowchart of an antenna control method according to an embodiment. In step S300, a plurality of sets of attenuation parameters A and delay parameters Δ are defined. Each set of attenuation parameters A consists of a plurality of attenuation elements α _k and respectively correspond to the kth remote antenna 160, and the plurality of attenuation elements α _k values can be defined by the device characteristics that the system components can provide; similarly, each The group delay parameter Δ is composed of a plurality of attenuation elements δ _k and respectively corresponding to the kth remote antenna unit 160, and the plurality of attenuation elements δ _k values can be defined by device characteristics that can be provided by the system components, k is 1~M Positive integer. In step S310, the measurement module 142 obtains a channel response corresponding to the kth remote antenna unit 160 when the user equipment 170 is located at the specific position p, and the channel response includes a signal strength value a _{p, k} and a The delay time τ _p,k ,k is a positive integer from 1 to M.

In step S322, each set of attenuation parameters and delay parameters are substituted one by one. In step S324, the control module 144 calculates _, according to the channel responses ( a _{p, k} and τ _{p, k} ), when the user equipment 170 is located at the specific position p, the attenuation parameter A and the delay parameter are substituted according to the step S322. The channel characteristic value σ _{p of} Δ is as shown in the formula (1). The channel characteristic value σ _p can reflect the amount of data transmission (channel transmission quality status) between the base station 120 and the user terminal 170 when the client device 170 is at a specific position p.

In step S326, it is determined whether the channel feature value σ _p exceeds a preset threshold value (preset channel feature value), and the preset threshold value is determined experimentally, for example, 2.5 μs.

When the channel feature σ _{p does} not exceed the preset threshold, in step S330, the control module 144 selects and outputs the set of attenuation parameters  _p and the delay parameter corresponding to the channel feature values that do not exceed the preset threshold value. The delay and attenuation module 148 is implemented to implement the set of attenuation parameters and delay parameters to improve channel transmission quality between the base station 120 and the base station 120 when the user equipment 170 is located at a specific position p. When the channel feature σ _p exceeds the preset threshold, in step S327, the control module 144 finds the set of attenuation parameters _Ap and the delay parameter _Δp corresponding to the preferred channel feature values, and determines whether or not in step S328. Each set of attenuation parameters and delay parameters have been substituted. If no, the process returns to step S322 to perform an iterative operation. If yes, then in step S330, the control module 144 selects and outputs a set of attenuation parameters  _p and delay parameters corresponding to a preferred channel feature value. To the delay and attenuation module 148, the channel transmission quality when the client device 170 is located at a specific position p is improved. In an embodiment, the preferred channel feature value is a minimum channel feature value, and steps S322-S330 can be represented by formula (2), where T _σ is a preset threshold value.

Please refer to FIG. 4 , which illustrates a schematic diagram of a signal transmission path of a communication system 400 including an embodiment of an antenna control system according to the present disclosure. Explain the antenna control system in Figure 1A, 1B by Figure 4 Using the antenna control method described above, based on the viewpoint that the user equipment 170 is located at a specific position p, the set of attenuation parameters and delay parameters for optimizing the channel characteristic values of the plurality of remote antenna units 160 are found, and then the remote antenna is controlled. The transmit power and delay time of the unit 160 improve the channel transmission quality when the user equipment 170 is in the coverage area C, so that the problem of the data transmission rate degradation caused by the multiple path effect in the distributed antenna system can be solved. In FIG. 4, each of the delay and attenuation modules 148 is composed, for example, by a delay element DLY and attenuating element ATT in series.

Next, the case where the client device 170 is located at any position within the coverage of the base station 120 and the base station corresponds to the M remote antenna units 160 will be discussed. Please refer to FIG. 5, which is a detailed flowchart of an example of an antenna control method according to another embodiment of the present disclosure. In step S500, a plurality of sets of attenuation parameters A and delay parameters Δ are defined, each set of attenuation parameters A consisting of a plurality of attenuation elements α _k and respectively corresponding to the kth remote antenna 160, the plurality of attenuation elements α _k values By the definition of the device characteristics that can be provided by the system components; for the same reason, each set of delay parameters Δ is composed of a plurality of attenuation elements δ _k and respectively corresponding to the kth remote antenna 160, and the plurality of attenuation elements δ _k are The system component can be defined by the device characteristics provided, and k is a positive integer from 1 to M. In step S510, the measurement module 142 obtains the channel response corresponding to the kth remote antenna unit 160 when the user equipment 170 is located at any position p, and the channel response includes a signal strength value a _{p, k} and a delay. The time τ _p,k ,k is a positive integer from 1 to M.

In step S522, each set of attenuation parameters and delay parameters are substituted one by one. In step S524, the control module 144 calculates _, according to the channel responses ( a _{p, k} and τ _{p, k} ), when the user equipment 170 is located at any position p of the coverage range C, the group attenuation parameter is substituted according to step S522. The channel characteristic value σ _{p of} A and the delay parameter Δ is as shown in the formula (1). The channel characteristic value σ _p can reflect the amount of data transmission (channel transmission quality status) between the base station 120 and the user equipment 170 device when the client device 170 is located at any position p of the coverage area C.

In step S526, it is calculated that the user equipment 170 is evenly distributed at any position p of the coverage area C, and the probability values σ _{p of the} channel are greater than a preset threshold value (preset channel feature value), such as formula (3). As shown, where T _σ is a preset threshold determined experimentally, for example, 2.5 μs.

In step S527, the control module 144 finds the set of attenuation parameters  and delay parameters corresponding to the minimum probability. And in step S528, it is determined whether each set of attenuation parameters and delay parameters have been substituted. If not, the process returns to step S522 to perform an iterative operation. If yes, proceed to step S530, the control module 144 selects and outputs the set of attenuation parameters  and delay parameters corresponding to the minimum probability. The delay and attenuation module 148 is used to improve the channel transmission quality between the client device 170 and the base station 120 when it is in the coverage area C. The substantial effects of steps S522 to S530 can be expressed by equation (4).

The above antenna control method is based on the viewpoint that the user equipment 170 is located in the coverage area C, and finds the group that optimizes the probability that the user equipment 170 is located in the coverage area C and the channel characteristic value between the base station 120 and the base station 120 is greater than the preset threshold value. Attenuation parameters and delay parameters, and then control to adjust the remote antenna unit The transmission power and delay time of 160 improve the transmission quality between the client device 170 and the base station 120 when the coverage area C is located, so that the problem of the data transmission rate degradation caused by the multipath effect in the distributed antenna system can be solved. If the environment is not easily changed, in the antenna system 100 of FIG. 1B, the delay and attenuation module 168 can be directly set according to the attenuation parameter and the delay parameter, and the multiplexer 149, the multiplexer 169 and the controller 167 are omitted.

In addition, as shown in FIG. 6, a schematic diagram of a signal transmission path of the communication system 600 including one embodiment of the antenna system according to the present disclosure is shown. The antenna control method of FIG. 1C is explained by using FIG. 6 to apply the antenna control method described above. The communication system 600 includes a base station 120, a plurality of remote antenna blocks 610_1 and 610_2, a measurement module (not shown), a control module (not shown), and an attenuation module 648 ( Consists of multiple attenuation components). Each of the remote antenna blocks 610 includes a first remote antenna unit and a second remote antenna unit. The distance between the first remote antenna unit and the base station 120 is greater than the distance between the second remote antenna unit and the base station 120. the distance.

The function of the measurement module and the control module is the same as the antenna control method described above, and finally determines the attenuation parameter corresponding to the characteristic value of the preferred channel according to a preset channel characteristic value. The attenuation module implements attenuation parameters corresponding to the smaller channel characteristic values to the first remote antenna units, such as the remote antenna units 2 and 3. Taking the remote antenna block 610_1 as an example, the distance between the remote antenna unit 2 and the base station 120 is greater than the distance between the remote antenna unit 3 and the base station 120, that is, the signal of the remote antenna unit 2 between the optical fibers. The delivery delay is longer. Therefore, the attenuation parameter is applied by the attenuation module 648 composed of the attenuation element ATT2 to reduce the transmission power of the remote antenna unit 2 and maintain Transmit power of the remote antenna unit 3. Therefore, the multipath effect of the decentralized antenna system 600 is mitigated without the need to adjust the delay parameters. As can be seen from Fig. 6, it can be seen that the transmission power of the remote antenna unit farther from the base station 120 in the single remote antenna block is attenuated.

An embodiment of the antenna control method and apparatus disclosed in the foregoing embodiment, according to a preset channel feature value, finds a channel feature value between the base station 120 and the base station 120 when the optimized user equipment 170 is located in the coverage area C, and according to In order to control the transmit power and delay time of the remote antenna unit, the multipath effect problem of the antenna system can be effectively solved. In addition, the present disclosure further proposes an asymmetric antenna system, which reduces the computational complexity of the antenna system for channel adjustment and saves the deployment cost of the antenna system.

In summary, although the above has been disclosed in various embodiments, it is not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100, 100’, 100”, 400, 600‧‧‧ communication systems

120‧‧‧Base station

140, 140’‧‧‧ head unit

142‧‧‧Measurement module

144‧‧‧Control Module

145,161‧‧‧Electrical to Optical Converter (E/O)

146‧‧‧Antenna Control System

147, 162‧ ‧ photoelectric converter (O / E)

148, 168‧‧‧ Delay and Attenuation Modules

149‧‧‧Multiplexer

152, 165‧‧‧Upstream and Downlink Signal Controller

154‧‧‧Synthesizer

156‧‧ ‧Discriminator

160, 160'‧‧‧Remote antenna unit

163‧‧‧Low noise amplifier

164‧‧‧Power Amplifier

166‧‧‧Antenna

167‧‧‧ Controller

169‧‧ ‧ multiplexer

170‧‧‧Customer device

610, 610_1, 610_2‧‧‧ remote antenna block

648‧‧‧Attenuation Module

FIG. 1A is a schematic diagram showing a communication system including an embodiment of an antenna control device according to the present disclosure.

FIG. 1B illustrates another communication system including a schematic diagram of another embodiment of an antenna control apparatus according to the present disclosure.

FIG. 1C illustrates another communication system including a schematic diagram of another embodiment of an antenna control apparatus according to the present disclosure.

FIG. 2 is a flow chart showing an embodiment of an antenna control method according to the present disclosure.

FIG. 3 is a detailed flowchart of an embodiment of an antenna control method according to the present disclosure.

FIG. 4 is a schematic diagram showing a simplified construction of an embodiment of an antenna control system according to the present disclosure.

FIG. 5 is a detailed flowchart of another embodiment of an antenna control method according to the present disclosure.

FIG. 6 is a schematic diagram showing a schematic layout of another embodiment of an antenna control system according to the present disclosure.

100‧‧‧Communication system

120‧‧‧Base station

140‧‧‧ head unit

142‧‧‧Measurement module

144‧‧‧Control Module

145,161‧‧‧Electrical to Optical Converter (E/O)

146‧‧‧Antenna Control System

147, 162‧ ‧ photoelectric converter (O / E)

148‧‧‧Delay and Attenuation Module

152, 165‧‧‧Upstream and Downlink Signal Controller

154‧‧‧Synthesizer

156‧‧ ‧Discriminator

160‧‧‧Remote antenna unit

163‧‧‧Low noise amplifier

164‧‧‧Power Amplifier

166‧‧‧Antenna

170‧‧‧Customer device

Claims (19)

An antenna control method includes: defining a plurality of sets of attenuation parameters and delay parameters; acquiring a plurality of channel responses of a user equipment and a base station corresponding to the plurality of remote antenna units; calculating corresponding plurality of sets of attenuation according to the channel responses a plurality of channel feature values of the parameter and the delay parameter, the channel feature values reflecting a data transmission amount between the base station and the client device; and selecting and outputting a corresponding set of attenuation parameters according to a preset channel feature value The delay parameter is between the base station and the remote antennas. The antenna control method of 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, each channel response including a signal strength Value and a delay time. The antenna control method according to claim 1, wherein the client device is located at a specific location within a coverage of the base station, and the step of acquiring the channel responses comprises: acquiring when the client device is located The particular location corresponds to the channel responses of the remote antenna units. The antenna control method of claim 3, wherein the calculating the channel characteristic values comprises: calculating, according to the channel response, when the user equipment is located at the specific position, corresponding to the group attenuation parameters These channel feature values with delay parameters. An antenna control method as described in claim 4, The preset channel feature value is a preset threshold value, and the step of selecting and outputting includes: determining whether the channel feature values exceed the preset threshold value; and when one of the channel feature values does not exceed the preset value Setting a threshold value, selecting and outputting the set of attenuation parameters and delay parameters corresponding to the channel characteristic value that does not exceed the preset threshold value. The antenna control method according to claim 5, wherein the step of selecting and outputting further comprises: selecting and outputting a channel characteristic corresponding to the predetermined data transmission amount when the channel characteristic values exceed the preset threshold value. The value corresponds to the set of attenuation parameters and delay parameters. The antenna control method according to claim 1, wherein the client device is located at any position within a coverage of the base station, and the step of acquiring the channel responses comprises: acquiring when the client device is located Any of the locations within the coverage corresponds to the channel responses of the remote antenna units. The antenna control method of claim 7, wherein the calculating the channel characteristic values comprises: calculating, according to the channel response, when the user equipment is located at any position within the coverage area, corresponding to The channel attenuation values of the group attenuation parameter and the delay parameter. The antenna control method according to claim 8, wherein the preset channel characteristic value is a preset threshold value, and the step of selecting and outputting comprises: calculating each of the set of attenuation parameters and delay parameters aisle The probability that the feature value is greater than a predetermined threshold value; and selecting and outputting the set of attenuation parameters and delay parameters corresponding to the minimum values of the probabilities. An antenna control system includes: a measurement module for acquiring a plurality of channel responses of a client device and a base station corresponding to a plurality of remote antenna units; and a control module for using the channels Responding to calculate a plurality of channel feature values corresponding to the plurality of sets of attenuation parameters and delay parameters, wherein the channel feature values reflect data transmission amount between the base station and the user equipment, and select and output corresponding according to a preset channel feature value a set of attenuation parameters and delay parameters between the base station and the remote antennas; and a plurality of delay and attenuation modules for implementing the set of attenuation parameters and delay parameters output by the control module. The antenna control system of 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, each channel response includes A signal strength value and a delay time. The antenna control system of claim 10, wherein the user equipment is located at a specific location within a coverage of the base station, and the measurement module acquires when the user equipment is located at the specific location. The channels of the remote antenna units are responsive. The antenna control system of claim 12, wherein the control module calculates, according to the channel responses, the channels corresponding to the set of attenuation parameters and delay parameters when the user equipment is located at the specific location Eigenvalues. The antenna control system of claim 13, wherein the preset channel characteristic value is a preset threshold value, and the control module determines whether the channel feature values exceed the preset threshold value, and One of the channel feature values does not exceed the preset threshold value, and the control module selects and outputs the set of attenuation parameters and delay parameters corresponding to the channel feature values that do not exceed the preset threshold value. The antenna control system of claim 14, wherein when the channel characteristic values exceed the preset threshold, the control module selects and outputs the group corresponding to the channel characteristic value corresponding to the predetermined data transmission amount. Attenuation parameters and delay parameters. The antenna control system of claim 10, wherein the user equipment is located at any position within a coverage of the base station, and the measurement module acquires when the user equipment is located in the coverage area. The one location corresponds to the channel responses of the remote antenna units. The antenna control system of claim 16, wherein the control module calculates, according to the channel response, when the user equipment is located at any position within the coverage, corresponding to the group of attenuation parameters and delay parameters. The channel feature values. The antenna control system of claim 17, wherein the preset channel characteristic value is a preset threshold value, and the control module calculates that each of the set of attenuation parameters and the delay parameter corresponds to the channel characteristic value is greater than The probability of the preset threshold value, and the control module selects and outputs the set of attenuation parameters and delay parameters corresponding to the minimum values of the probabilities. An antenna control system includes: a plurality of remote antenna blocks, each of which includes a first antenna block a remote antenna unit and a second remote antenna unit, wherein a distance between the first remote antenna unit and a base station is greater than a distance between the second remote antenna unit and the base station; Obtaining a plurality of channel responses of the user equipment corresponding to the remote antenna units; and a control module, configured to calculate, according to the channel responses, a plurality of channel feature values corresponding to the plurality of attenuation parameter groups, the channel characteristics The value reflects the data transmission amount between the base station and the user equipment, and selects and outputs a corresponding attenuation parameter group between the base station and the plurality of remote antenna blocks according to a preset channel characteristic value; The attenuation module is configured to implement the attenuation parameter group output by the control module to the first remote antenna unit of the plurality of remote antenna blocks.