WO2015062012A1 - Phase measurement method, apparatus, and system - Google Patents

Abstract

Disclosed in the embodiments of the present invention is a phase measurement method, comprising: in a first time window, receiving a first test signal sent by a first RRU, and measuring a first reception time value at the time of lowest power or amplitude of the first test signal received in the first time window; in a second time window, receiving a second test signal sent by a second RRU, and measuring a second reception time value at the time of lowest power or amplitude of the second test signal received in the second time window; on the basis of a pre-determined phase rotation speed, time differential, and time interval value, calculating the phase difference of the first RRU and the second RRU. Also disclosed is a related apparatus and system. The present invention can improve the accuracy of phase difference measurement, fulfilling the performance requirements of cooperative communication.

Description

 Phase measuring method, device and system

Technical field

 The present invention relates to the field of communications, and in particular, to a phase measurement method, apparatus, and system. Background technique

 With the development of communication technology, communication fields are also demanding higher and higher communication parameters, among which phase is an important parameter in communication. Especially in the Coordinated Multiple Points (CoMP) transmission technology, there are special requirements for the phase synchronization between the Radio Remote Units (RRUs). In the phase between the synchronous RRUs, it is necessary to acquire the phase difference between the RRUs, and phase synchronization between the RRUs is realized according to the phase differences. At present, the phase difference between the measured RRUs is mainly measured by the following method:

 The user equipment acquires a set of coordinated cells, and uses a downlink pilot signal of each coordinated cell in the set to use a channel vector corresponding to a transmitting antenna of the user equipment and a base station of the base station where the user equipment is located as a reference, and then reuses A receiving antenna of the user equipment is compared with a channel vector corresponding to a transmitting antenna of a base station where the cooperative cell is located, and a phase difference of the coordinated cell with respect to the user equipment home cell is determined by an estimation operation. The user equipment then feeds back the phase difference of the coordinated cell with respect to the home cell to the base station through the air interface, so that the base station acquires the phase difference between the RRU in the coordinated cell and the RRU in the home cell according to the feedback information.

 In the above technique, since the phase difference is fed back by the user equipment by using the air interface resource, the phase difference fed back in the actual application is affected by various factors such as different air channel conditions and quantization error introduced by the air interface feedback. Therefore, the phase difference accuracy measured in the above technique is poor, and the performance requirement of cooperative communication cannot be satisfied. Summary of the invention

 Embodiments of the present invention provide a phase measurement method, apparatus, and system, which can improve the phase difference accuracy of measurement to meet the performance requirements of cooperative communication.

In a first aspect, an embodiment of the present invention provides a phase measurement method, including: Receiving, in a first time window, a first test signal sent by the first RRU, and measuring a first received time value when the power or amplitude of the first test signal received in the first time window is the lowest; The first test signal is constant in power or amplitude when the first RRU sends the first test signal, and the phase of the first test signal is phase rotated at a preset phase rotation speed;

 Receiving, in a second time window, a second test signal sent by the second RRU, and measuring a second received time value when the power or amplitude of the second test signal received in the second time window is the lowest; The power or amplitude of the second test signal when the second RRU sends the second test signal is constant, and the phase of the second test signal is phase rotated at the preset phase rotation speed;

 Calculating a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value; wherein, the time difference is the first receiving time value and The second time receives a difference between values, the time interval value representing a time interval between the first time window and the second time window.

 In a first possible implementation manner of the first aspect, the determining, by the preset phase rotation speed, the time difference value, and the time interval value, a phase difference between the first RRU and the second RRU, Includes:

 Multiplying the preset phase rotation speed by the time difference to obtain a first phase value; multiplying the preset phase rotation speed by the time interval value to obtain a second phase value, and Adding a second phase value to the second phase value to obtain a third phase value;

 And a phase difference obtained by subtracting the third phase value from the first phase value is used as a phase difference between the first RRU and the second RRU.

 With reference to the first aspect, in a second possible implementation manner of the first aspect, the calculating, by the preset phase rotation speed, the time difference value, and the time interval value, the first RRU and the second RRU After the phase difference between the two, the method further includes:

 Obtaining a phase jitter state between the first RRU and the second RRU according to a phase difference between the first RRU and the second RRU at a plurality of different time points.

With reference to any of the foregoing implementation manners of the first aspect, the third possible implementation manner of the first aspect, the method further includes: Transmitting, to the first RRU, first time window configuration information for configuring a length and/or a location of the first time window, to enable the first RRU to configure the first time according to the first time window configuration information The length and/or position of a time window; and/or

 Transmitting, to the second RRU, second time window configuration information for configuring a length and/or a position of the second time window, so that the second RRU configures the first according to the second time window configuration information The length and/or position of the two time windows.

 With reference to the first aspect, or the first possible implementation of the first aspect, or the second possible implementation of the first aspect, in a fourth possible implementation manner of the first aspect, the method further includes: Transmitting, by the first RRU, first rotation step size configuration information for configuring a rotation step of the phase rotation of the first test signal, so that the first RRU configures the first rotation step according to the first rotation step configuration information. The rotation step of the first test signal; and/or

 Transmitting, to the second RRU, second rotation step configuration information for configuring a rotation step of the phase rotation of the second test signal, so that the second RRU is configured according to the second rotation step configuration information a rotation step of the second test signal.

 In a second aspect, an embodiment of the present invention provides a phase measuring apparatus, including: a first measuring unit, a second measuring unit, and a calculating unit, where:

 The first measuring unit is configured to receive a first test signal sent by the first radio remote unit RRU in a first time window, and measure the first test signal received in the first time window. The first receiving time value when the power or the amplitude is the lowest; wherein the power or amplitude of the first test signal when the first RRU sends the first test signal is constant, and the phase of the first test signal is Preset the phase rotation speed for phase rotation;

 The second measuring unit is configured to receive a second test signal sent by the second RRU in the second time window, and measure that the power or amplitude of the second test signal received in the second time window is the lowest a second receiving time value of the second test signal; wherein the power or amplitude of the second test signal when the second RRU sends the second test signal is constant, and the phase of the second test signal is determined by the preset Phase rotation speed for phase rotation;

The calculating unit is configured to calculate a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value; wherein the time difference is Determining a difference between the first received time value and the second time received value, the time interval value indicating A time interval between the first time window and the second time window.

 In a first possible implementation manner of the second aspect, the calculating unit is further configured to: perform multiplication on the preset phase rotation speed and the time difference value to obtain a first phase value; and set the preset Multiplying a phase rotation speed by the time interval value to obtain a second phase value, adding the second phase value to a specific phase value to obtain a third phase value; and subtracting the first phase value from the first phase value The phase difference obtained by the three phase values is used as a phase difference between the first RRU and the second RRU.

 With reference to the second aspect, in a second possible implementation manner of the second aspect, the device further includes: an acquiring unit, configured to perform, according to the plurality of different time points, between the first RRU and the second RRU The phase difference acquires a phase jitter state between the first RRU and the second RRU.

 With reference to the second aspect, or the first possible implementation of the second aspect, or the second possible implementation of the second aspect, in a third possible implementation manner of the second aspect, the device further includes: a configuration unit, configured to send, to the first RRU, first time window configuration information for configuring a length and/or a location of the first time window, so that the first RRU is configured according to the first time window Information configuring the length and/or position of the first time window; and/or

 a second configuration unit, configured to send, to the second RRU, second time window configuration information for configuring a length and/or a location of the second time window, so that the second RRU is according to the second time The window configuration information configures the length and/or position of the second time window.

 With reference to the second aspect, or the first possible implementation of the second aspect, or the second possible implementation of the second aspect, in a fourth possible implementation manner of the second aspect, the device further includes: a configuration unit, configured to send, to the first RRU, first rotation step size configuration information for configuring a rotation step of the phase rotation of the first test signal, so that the first RRU is according to the first rotation The step size configuration information configures a rotation step size of the first test signal; and/or

 a fourth configuration unit, configured to send second rotation step configuration information for configuring a rotation step of the phase rotation of the second test signal to the second RRU, so that the second RRU is according to the The second rotation step configuration information configures a rotation step size of the second test signal.

 In a third aspect, an embodiment of the present invention provides a phase measurement system, including: a first RRU, a second RRU, and a measurement device, where:

The first RRU is configured to send a first test signal to the measuring device in a first time window, where the first test signal is power when the first RRU sends the first test signal or The amplitude of the first test signal is constant, and the phase of the first test signal is rotated at a preset phase rotation speed; the measuring device is configured to measure the power of the first test signal received in the first time window Or the first reception time value when the amplitude is the lowest;

 The second RRU is configured to send a second test signal to the measuring device in a second time window, where the power or amplitude of the second test signal when the second RRU sends the second test signal Constant, and the phase of the second test signal is phase rotated at the preset phase rotation speed;

 The measuring device is further configured to measure a second receiving time value when the power or amplitude of the second test signal received in the second time window is the lowest;

 The measuring device is further configured to calculate a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value; wherein the time difference is Determining a difference between the first received time value and the second time received value, the time interval value indicating a time interval between the first time window and the second time window.

 In a fourth aspect, an embodiment of the present invention provides a phase measuring apparatus, including: a receiver and a memory, and a processor respectively connected to the receiver and the memory, wherein the memory is used to store a set of program codes, where The processor is configured to invoke the program code to perform the following operations:

 Receiving, by the receiver, a first test signal sent by the first remote radio unit RRU in a first time window, and measuring a minimum power or amplitude of the first test signal received in the first time window a first receiving time value; wherein, the first test signal has a constant power or amplitude when the first RRU transmits the first test signal, and a phase of the first test signal is rotated by a preset phase Speed is phase rotated;

 Receiving, by the receiver, a second test signal sent by the second RRU in a second time window, and measuring a second power when the power or amplitude of the second test signal received in the second time window is the lowest Receiving a time value; wherein, the power or amplitude of the second test signal when the second RRU sends the second test signal is constant, and the phase of the second test signal is performed at the preset phase rotation speed Phase rotation

Calculating a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value; wherein, the time difference is the first receiving time value and And comparing, by the second time, a difference between values, the time interval value indicating the first time window and The time interval between the second time windows.

 In a first possible implementation manner of the fourth aspect, the performing, by the processor, calculating, between the first RRU and the second RRU, according to the preset phase rotation speed, the time difference value, and the time interval value. The operation of the phase difference includes:

 Multiplying the preset phase rotation speed by the time difference to obtain a first phase value; multiplying the preset phase rotation speed by the time interval value to obtain a second phase value, and Adding a second phase value to the second phase value to obtain a third phase value;

 And a phase difference obtained by subtracting the third phase value from the first phase value is used as a phase difference between the first RRU and the second RRU.

 With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the processor, after performing the performing, calculating the first according to the preset phase rotation speed, the time difference value, and the time interval value After the operation of the phase difference between the RRU and the second RRU, the following operations are also performed:

 Obtaining a phase jitter state between the first RRU and the second RRU according to a phase difference between the first RRU and the second RRU at a plurality of different time points.

 With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, or the second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the apparatus further includes a transmitter, The processor is further configured to perform the following operations:

 Transmitting, by the transmitter, first time window configuration information for configuring a length and/or a location of the first time window to the first RRU, to configure the first RRU according to the first time window Information configuring the length and/or position of the first time window; and/or

 Transmitting, by the transmitter, second time window configuration information for configuring a length and/or a location of the second time window to the second RRU, to configure the second RRU according to the second time window The information configures the length and/or position of the second time window.

 With reference to the fourth aspect, or the first possible implementation manner of the fourth aspect, or the second possible implementation manner of the fourth aspect, the fourth possible implementation manner of the fourth aspect, the apparatus further includes a transmitter, The processor is further configured to perform the following operations:

Transmitting, by the transmitter, first rotation step configuration information for configuring a rotation step of phase rotation of the first test signal to the first RRU, so that the first RRU is according to the first rotation The step size configuration information configures a rotation step size of the first test signal; and/or Transmitting, by the transmitter, second rotation step configuration information for configuring a rotation step of phase rotation of the second test signal to the second RRU, so that the second RRU is according to the second rotation The step size configuration information configures a rotation step size of the second test signal.

 In the foregoing technical solution, the first test signal sent by the first RRU is received in the first time window, and the first power or the amplitude of the first test signal received in the first time window is measured to be the first Receiving a time value; receiving a second test signal sent by the second RRU in the second time window, and measuring a second receive when the power or amplitude of the second test signal received in the second time window is the lowest a time value; calculating a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value. In this way, the test signal sent by the RRU can be directly measured to calculate the phase difference between the RRUs. Compared with the prior art, the phase difference is fed back by using the air interface resource by the user equipment, and the embodiment of the present invention can improve the phase difference precision of the measurement to meet the requirements. Performance requirements for collaborative communications. DRAWINGS

 In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description It is merely some embodiments of the present invention, and those skilled in the art can obtain other drawings according to these drawings without any creative work.

 1 is a schematic flow chart of a phase measurement method according to an embodiment of the present invention;

 2 is a schematic flow chart of another phase measurement method according to an embodiment of the present invention; FIG. 3 is a schematic diagram of an optional phase rotation according to an embodiment of the present invention;

 4 is a schematic structural diagram of a phase measuring device according to an embodiment of the present invention;

 FIG. 5 is a schematic structural diagram of a phase measuring apparatus according to an embodiment of the present invention; FIG.

 6 is a schematic structural diagram of a phase measuring device according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another phase measuring apparatus according to an embodiment of the present invention; FIG. 8 is a schematic structural diagram of another phase measuring apparatus according to an embodiment of the present invention; FIG. 9 is another embodiment of the present invention. FIG. 10 is a schematic structural diagram of another phase measuring apparatus according to an embodiment of the present invention; and FIG. 11 is a schematic structural diagram of a phase measuring system according to an embodiment of the present invention. detailed description

 BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

 BRIEF DESCRIPTION OF THE DRAWINGS The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

 In the embodiment of the present invention, the first RRU may be an RRU included in a certain base station, and the second RRU may be an RRU included in another base station. Of course, the first RRU and the second RRU may be two included in the same base station. RRU. When the first RRU and the second RRU belong to different base stations, the phase difference between the first RRU and the second RRU may be understood as the phase difference between the two different base stations.

 Please refer to FIG. 1. FIG. 1 is a schematic flowchart of a phase measurement method according to an embodiment of the present invention. As shown in FIG. 1, the method includes the following steps:

 101. Receive a first test signal sent by the first radio remote unit RRU in a first time window, and measure a power or a minimum amplitude of the first test signal received in the first time window. a receiving time value; wherein, the power or amplitude of the first test signal when the first RRU sends the first test signal is constant, and the phase of the first test signal is phased at a preset phase rotation speed Rotate.

 Optionally, the first test signal may be a time continuous test signal, for example, a time continuous test signal in the first time window; or the first test signal is a time-discrete test signal.

Optionally, the first receiving time value when the power or the amplitude of the first test signal received in the first time window is the lowest in the first time window may be: collecting multiple in the first time window. The power value or amplitude value of the first test signal, and then selecting the lowest power value or the lowest amplitude value from the plurality of power values or amplitude values, and then collecting the lowest power value or amplitude value The acquisition time is taken as the first reception time described above. For example, the length of the first time window is 360 microseconds (us), and the phase of the first test signal in the first time window is rotated by 360 degrees, that is, the preset phase rotation speed is 1 degree per us. The acquisition time slot is lus, then step 101 can collect the power value or amplitude value of the first test signal of 360 different phases, and then select the lowest power value or amplitude value from the 360 power values or amplitude values. Thereby, the above first reception time value is obtained.

 It should be noted that the power and amplitude of the first test signal may be two parallel parameters, that is, when the power of the first test signal is measured in step 101, then the amplitude of the first test signal may not be measured, and the same reason. When the amplitude of the first test signal is measured, the power of the first test signal may not be measured.

 Optionally, the power or the amplitude of the first test signal when the first test signal is sent by the first RRU may be the power of the first test signal when the first test signal is acquired by the first RRU. Or the amplitude is constant, for example: the power or amplitude of the first test signal generated by the first RRU is constant, or the power or amplitude of the first test signal sent by the first RRU to other devices (eg, other base stations) is constant. That is, the power or amplitude of the first test signal is constant before the first test signal is transmitted. However, in practice, the power or amplitude of the first test signal is often affected by the first RRU characteristic or the transmission network during the transmission process. For example, the first RRU generates a carrier leakage when transmitting the first test signal, so that At the time of the carrier leakage, the power or amplitude of the first test signal may decrease, that is, the power or amplitude of the first test signal received by step 101 at this time may be relatively low. Therefore, the power or amplitude of the first test signal received in step 101 can be changed. For example, when the phases of the first test signals are different, the power or amplitude of the first test signal can be different.

 Optionally, the phase of the first test signal is rotated at a preset phase rotation speed. Specifically, the phase of the first test signal is time-varying. For example, the preset phase rotation speed is 1 rotation per us. Degree, then the phase of the above first test signal is rotated by 1 degree per lus. Of course, the first RRU itself has a phase, that is, the first test signal may be phase-rotated with the phase of the first RRU as the starting phase, that is, the phase of the first test signal transmission time is first. The phase of the RRU.

102. Receive a second test signal sent by the second RRU in a second time window, and measure a second receive when the power or amplitude of the second test signal received in the second time window is the lowest. a time value; wherein, the second test signal has a constant power or amplitude when the second RRU sends the second test signal, and a phase of the second test signal is phased at the preset phase rotation speed Rotate.

 Optionally, the description of the second test signal and the power of the second test signal may be specifically described above with reference to the first test signal. The second test signal may also be equivalent to the first test signal, for example: power or amplitude is equal, and phase rotation steps are equal. The step of the phase rotation may specifically refer to an angle of the phase rotation of the test signal in the time window (for example: the phase rotation step of the first test signal may be the angle of the phase rotation of the first test signal in the first time window) ). Of course, the power or amplitude of the second test signal may be different from the power or amplitude of the first test signal, or the step of the phase rotation of the second test signal is different from the step of the phase rotation of the first test signal. of.

 103. Calculate, according to the preset phase rotation speed, the time difference value, and the time interval value, a phase difference between the first RRU and the second RRU, where the time difference is the first receiving time. a difference between the value and the second time received value, the time interval value representing a time interval between the first time window and the second time window.

 Optionally, the first time window and the second time window may be two time windows in which there is no time overlap, that is, the time interval exists between the first time window and the second time window.

 Optionally, the phase difference between the first RRU and the second RRU may specifically refer to a difference between a phase of the first RRU and a phase of the second RRU.

 Optionally, the foregoing first RRU may specifically represent one or more RRUs, and the second RRU may specifically represent one or more RRUs, when the first RRU represents multiple RRUs, or the second RRU represents multiple RRUs. The above method can calculate the phase difference between at least three RRUs.

 Optionally, the foregoing method is specifically applicable to any device that can receive signals sent by multiple RRUs, that is, the device can implement the foregoing method. For example: base station, Joint Processing (JP) device, server, base station controller, and network core network element.

In the foregoing technical solution, the first test signal sent by the first RRU is received in the first time window, and the first power or the amplitude of the first test signal received in the first time window is measured to be the first Receiving a time value; receiving a second test signal sent by the second RRU in the second time window, And measuring a second receiving time value when the power or amplitude of the second test signal received in the second time window is the lowest; calculating according to the preset phase rotation speed, the time difference value, and the time interval value a phase difference between the first RRU and the second RRU. In this way, the test signal sent by the RRU can be directly measured to calculate the phase difference between the RRUs. Compared with the prior art, the phase difference is fed back by using the air interface resource by the user equipment, and the embodiment of the present invention can improve the phase difference precision of the measurement to meet the requirements. Performance requirements for collaborative communications. Please refer to FIG. 2. FIG. 2 is a schematic flowchart diagram of another phase measurement method according to an embodiment of the present invention. As shown in FIG. 2, the method includes:

 201. Receive a first test signal sent by the first radio remote unit RRU in a first time window, and measure a power or a minimum amplitude of the first test signal received in the first time window. a receiving time value; wherein, the power or amplitude of the first test signal when the first RRU sends the first test signal is constant, and the phase of the first test signal is phased at a preset phase rotation speed Rotate.

 202. Receive a second test signal sent by the second RRU in the second time window, and measure a second receive time value when the power or amplitude of the second test signal received in the second time window is the lowest. The power or amplitude of the second test signal when the second RRU sends the second test signal is constant, and the phase of the second test signal is phase rotated at the preset phase rotation speed.

 Optionally, the receiving the first test signal and receiving the second test signal may be that the first test signal and the second test signal are received by the combiner, and specifically, the combiner may be combined with the first RRU. The second RRU is connected. Specifically, the measuring the first receiving time value may be: calculating the first time value by measuring power or amplitude values of a plurality of time points of the first test signal after being combined by the combiner. Similarly, the second time received value is calculated.

203. Multiply the preset phase rotation speed and the time difference value to obtain a first phase value, and then multiply the preset phase rotation speed and the time interval value to obtain a second phase value, and Adding the second phase value to the specific phase value to obtain a third phase value; and subtracting the phase value obtained by subtracting the third phase value from the first phase value as the first RRU and the second RRU a phase difference between the first receiving time value and the second time receiving A difference between values, the time interval value representing a time interval between the first time window and the second time window.

 Optionally, the specific phase value may specifically represent a phase in which the first test signal is rotated by the phase rotation in the first time window. For example, the phase of the first test signal rotated by the phase rotation in the first time window is 2π, and then the specific phase value is 2π, and the phase of the first test signal rotated by the phase rotation in the first time window. For 1 π, then the above specific phase value is 1 π.

 It should be noted that the phase rotated by the phase rotation of the second test signal in the second time window may be equivalent to the phase rotated by the phase rotation of the first test signal in the first time window, and may not be equivalent to the first The phase at which the test signal is rotated by the phase rotation in the first time window.

 Optionally, step 203 may specifically calculate a phase difference between the first RRU and the second RRU by using the following formula:

A0 = At - c + 0 _2l ι = - c - h

 And indicating a phase difference between the first RRU and the second RRU, At represents the time difference value, c represents the preset phase rotation speed, and represents the time interval value, and h represents the specific phase value.

 The above formula is verified with reference to FIG. 3, wherein RRU1 (the first RRU above) has a phase of RRU1 in the first time window, and a phase periodic traversal of the first test signal of RRU1 (ie, phase rotation), phase rotation At a constant phase inversion to carrier leakage, the power of the first test signal is a low valley. In the second time window of RRU2 (the above second RRU), the phase of RRU2 is the phase periodic traversal of the second test signal of RRU2 (ie, the phase is rotated), and the phase is rotated to the constant phase inversion of carrier leakage, The power of the second test signal is a low valley. That is, you can get the following formula

9 ₂ + a ₂ ≡ +9 _OC

 The phase difference between RRU1 and RRU2 can be obtained by the above two formulas:

Αθ=θ ₁ - θ ₂ = α _ι - α ₂

This equation shows that the phase difference between RRU1 and RRU2 can be expressed as the phase of the first test signal rotated to the phase rotated and the phase of the second test signal rotated to the phase rotated. The difference is "-" 2. Since the power or amplitude of the first test signal and the second test signal are constant, the phase rotation is preset to a phase value h (for example, h = ² r ), and the phase rotation speed is _C. Therefore, the above time difference is equal to:

At = (2^--a ₁ )/c + t ₂₁ + α ₂ /c

 In the above formula, ^ is constant, and Δί is the above time difference. The above formula can be obtained by the above formula:

α ₂ -α =At-ct ₂₁ - c- n

Let ₂₁ = - t ₂₁ ' ^c _ ² , then, according to Αέ ^^ — and " = eight _ ₂₁ _ ² get the following formula:

A0 = At-c + 0 _2l The calculation formula used in step 203 can be obtained by the above verification.

 Optionally, the foregoing first test signal may be sent periodically, for example: the first RRU periodically sends the first test signal in multiple first time windows. The second test signal may also be periodically sent. For example, the second RRU periodically sends the second test signal in multiple second time windows.

 Optionally, in the actual application, the phase of the first RRU may be jittered, that is, the phase of the first RRU may change at different times. For example: The phase of the first RRU is dithered by the first RRU crystal oscillator clock or hardware circuitry. The phase of the second RRU also experiences jitter. In this embodiment, the phase jitter state between the first RRU and the second RRU may be obtained by measuring a phase difference between the first RRU and the second RRU at a plurality of different time points.

 That is, after the step 203, the method may further include:

 Obtaining a phase jitter state between the first RRU and the second RRU according to a phase difference between the first RRU and the second RRU at a plurality of different time points.

 That is, the above steps 201, 202, and 203 may be performed multiple times at different times to obtain a phase difference between the first RRU and the second RRU at the plurality of different time points. The phase jitter state between the first RRU and the second RRU may specifically refer to a jitter state of a phase difference between the first RRU and the second RRU at different time points. The jitter state can be used to better adjust the associated service sent by the first RRU and the second RRU (for example, the traffic transmitted in the CoMP transmission scenario) to synchronize the phases of the services sent by the first RRU and the second RRU.

 Optionally, as shown in FIG. 4, the method may further include:

204. Send, to the first RRU, a length and/or a location for configuring the first time window. a first time window configuration information, such that the first RRU configures a length and/or a position of the first time window according to the first time window configuration information; and/or

 205. Send, to the second RRU, second time window configuration information, configured to configure a length and/or a location of the second time window, so that the second RRU configures the second time window according to the second time window configuration information. The length and/or position of the second time window is described.

 Wherein, the above and/or indicating that step 204 and step 205 can be performed in either step, or both step 204 and step 205.

 The position of the first time window may specifically refer to a relative position between the first time window and the second time window, that is, a time interval between the first time window and the second time window, and the position of the second time window is specific. It may refer to the relative position of the second time window and the first time window. Since the phase difference between the calculation of the first RRU and the second RRU is calculated according to the time interval value described above, the calculation accuracy is higher when the time interval value is smaller in the calculation process, and in addition, when the first time window and The longer the length of the second time window is, the more the power value or the amplitude value of the first test signal may be collected in step 201, and the more the power value or the amplitude value of the second test signal collected in step 202 may be obtained. The more precise the above-mentioned first reception time value and second reception time value are, the higher the accuracy of the phase difference between the first RRU and the second RRU is calculated. In this way, the position of the first time window and/or the second time window can be configured, that is, the time interval between the first time window and the second time window can be configured to improve the phase difference between the first RRU and the second RRU. Precision. The foregoing step 204 and step 205 may be performed before step 201, and may be performed after step 203. The execution time of step 204 and step 205 is not limited in this embodiment. For example, after performing step 203, the user needs to adjust the precision of the phase difference between the first RRU and the second RRU, and step 204 and/or step 205 may be used to increase the phase between the first RRU and the second RRU. Poor precision. Of course, in this embodiment, the length and position of the first time window may also be set by the first RRU, and the length and position of the second time window may also be set by the second RRU.

 Optionally, as shown in FIG. 5, the method may further include:

 206. Send, to the first RRU, first rotation step size configuration information for configuring a rotation step of the phase rotation of the first test signal, so that the first RRU is configured according to the first rotation step Information configuring a rotational step size of the first test signal; and/or

207. Send, to the second RRU, a rotation for configuring phase rotation of the second test signal. a second rotation step configuration information of the step size, so that the second RRU configures a rotation step size of the second test signal according to the second rotation step configuration information.

 Wherein, the above and/or indicating, step 206 and step 207 can be performed in either step, or both step 206 and step 207.

 The rotation step of the first test signal may specifically refer to a phase in which the first test signal is rotated by position rotation in the first time window. In addition, the rotation step of the first test signal may be equal to the specific phase value described above. The rotation step of the second test signal may specifically refer to a phase rotated by the positional rotation of the second test signal in the second time window, wherein the rotation step of the second test signal may be equal to the first test signal. The rotation step size. For example, when the rotation step of the first test signal is shorter, and the power of the first test signal or the number of amplitude acquisition times is unchanged, then the phase interval of the first test signal collected is small, and thus the above-mentioned measurement is performed. The accuracy of the value at the time of reception is high, and conversely, the accuracy of the measured first reception time value is low. The same is true for the second reception time value. The phase difference between the first RRU and the second RRU is calculated based on the first reception time value and the second reception time value. This makes it possible to improve the accuracy of the phase difference between the first RRU and the second RRU by configuring the rotation step of the first test signal and/or the rotation step of the second test signal. The foregoing step 206 and step 207 may be performed before step 201, and may be performed after step 203. The execution time of step 206 and step 207 is not limited in this embodiment. For example, after performing step 203, the user needs to adjust the precision of the phase difference between the first RRU and the second RRU, and step 206 and/or step 207 can be used to increase the phase between the first RRU and the second RRU. Poor precision. Of course, in this embodiment, the rotation step of the first test signal may also be set by the first RRU, and the rotation step of the second test signal may also be set by the second RRU.

It should be noted that the embodiment shown in FIG. 5 can be implemented in combination with the embodiment shown in FIG. 4. In the above technical solution, various alternative embodiments are introduced in the above embodiments, and both can improve the phase difference accuracy of the measurement. The following is a device embodiment of the present invention. The device embodiment of the present invention is used to perform the method for implementing the first to second embodiments of the present invention. For the convenience of description, only parts related to the embodiment of the present invention are shown, and the specific technical details are not disclosed. Please refer to Embodiment 1 and Embodiment 2 of the present invention. Please refer to FIG. 6. FIG. 6 is a schematic structural diagram of a phase measuring apparatus according to an embodiment of the present invention. As shown in FIG. 6, the method includes: a first measuring unit 61, a second measuring unit 62, and a calculating unit 63, wherein: a measuring unit ₆₁ , configured to receive, in a first time window, a first test signal sent by the first remote radio unit RRU, and measure power of the first test signal received in the first time window or a first receiving time value when the amplitude is the lowest; wherein the power or amplitude of the first test signal when the first RRU sends the first test signal is constant, and the phase of the first test signal is preset The phase rotation speed performs phase rotation.

 Optionally, the first test signal may be a time continuous test signal, for example, a time continuous test signal in the first time window; or the first test signal is a time-discrete test signal.

 Optionally, the first measurement unit 61 may be configured to collect power values or amplitude values of the plurality of first test signals in the first time window, and select the lowest power from the plurality of power values or amplitude values. The value, or the lowest amplitude value, is used to collect the lowest power value or the acquisition time of the amplitude value as the first receiving time.

 Optionally, the power or the amplitude of the first test signal when the first test signal is sent by the first RRU may be the power of the first test signal when the first test signal is acquired by the first RRU. Or the amplitude is constant, for example: the power or amplitude of the first test signal generated by the first RRU is constant, or the power or amplitude of the first test signal sent by the first RRU to other devices (eg, other base stations) is constant. That is, the power or amplitude of the first test signal is constant before the first test signal is transmitted. However, in practice, the power or amplitude of the first test signal is often affected by the first RRU characteristic or the transmission network during the transmission process. For example, the first RRU generates a carrier leakage when transmitting the first test signal, so that At the time of the carrier leakage, the power or amplitude of the first test signal may decrease, that is, the power or amplitude at which the first measurement unit 61 receives the first test signal at this time may be relatively low. Therefore, the power or amplitude of the first test signal received by the first measuring unit 61 can be changed. For example, when the phases of the first test signals are different, the power or amplitude of the first test signal can be different.

Optionally, the phase of the first test signal is phase rotated at a preset phase rotation speed. Specifically, the phase of the first test signal is time-varying, for example, the preset phase rotation. The speed is 1 degree per us, and then the phase of the first test signal is rotated by 1 degree per lus. Of course, the first RRU itself has a phase, that is, the first test signal may be phase-rotated with the phase of the first RRU as the starting phase, that is, the phase of the first test signal transmission time is first. The phase of the RRU.

 a second measuring unit 62, configured to receive a second test signal sent by the second RRU in the second time window, and measure that the power or amplitude of the second test signal received in the second time window is the lowest a second receiving time value; wherein, the second test signal has a constant power or amplitude when the second RRU sends the second test signal, and a phase of the second test signal is at the preset phase The rotation speed is phase rotated.

 Optionally, the description of the second test signal and the power of the second test signal may be specifically described above with reference to the first test signal. The second test signal may also be equivalent to the first test signal, for example: power or amplitude is equal, and phase rotation steps are equal. The step of the phase rotation may specifically refer to an angle of the phase rotation of the test signal in the time window (for example: the phase rotation step of the first test signal may be the angle of the phase rotation of the first test signal in the first time window) ). Of course, the power or amplitude of the second test signal may be different from the power or amplitude of the first test signal, or the step of the phase rotation of the second test signal is different from the step of the phase rotation of the first test signal. of.

 The calculating unit 63 is configured to calculate a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value, where the time difference is a difference between the first received time value and the second time received value, the time interval value representing a time interval between the first time window and the second time window.

 Optionally, the first time window and the second time window may be two time windows in which there is no time overlap, that is, the time interval exists between the first time window and the second time window.

 Optionally, the phase difference between the first RRU and the second RRU may specifically refer to a difference between a phase of the first RRU and a phase of the second RRU.

Optionally, the foregoing first RRU may specifically represent one or more RRUs, and the second RRU may specifically represent one or more RRUs, when the first RRU represents multiple RRUs, or the second RRU represents multiple RRUs. The above method can calculate the phase difference between at least three RRUs. Optionally, the foregoing method may be specifically applied to any device that can receive signals sent by multiple RRUs, that is, the device can implement the foregoing method. For example: base station, Joint Processing (JP) device, server, base station controller, and network core network element.

In the foregoing technical solution, the first test signal sent by the first RRU is received in the first time window, and the first power or the amplitude of the first test signal received in the first time window is measured to be the first Receiving a time value; receiving a second test signal sent by the second RRU in the second time window, and measuring a second receive when the power or amplitude of the second test signal received in the second time window is the lowest a time value; calculating a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value. In this way, the test signal sent by the RRU can be directly measured to calculate the phase difference between the RRUs. Compared with the prior art, the phase difference is fed back by using the air interface resource by the user equipment, and the embodiment of the present invention can improve the phase difference precision of the measurement to meet the requirements. Performance requirements for collaborative communications. Please refer to FIG. 7. FIG. 7 is a schematic structural diagram of a phase measuring apparatus according to an embodiment of the present invention. As shown in FIG. 7, the method includes: a first measuring unit 71, a second measuring unit 72, and a calculating unit 73, wherein: a measuring unit ₇₁ , configured to receive, in a first time window, a first test signal sent by the first remote radio unit RRU, and measure power of the first test signal received in the first time window or a first receiving time value when the amplitude is the lowest; wherein the power or amplitude of the first test signal when the first RRU sends the first test signal is constant, and the phase of the first test signal is preset The phase rotation speed performs phase rotation.

 a second measuring unit 72, configured to receive a second test signal sent by the second RRU in the second time window, and measure that the power or amplitude of the second test signal received in the second time window is the lowest a second receiving time value; wherein, the second test signal has a constant power or amplitude when the second RRU sends the second test signal, and a phase of the second test signal is at the preset phase The rotation speed is phase rotated.

a calculating unit 73, configured to multiply the preset phase rotation speed and the time difference value to obtain a first phase value; and multiply the preset phase rotation speed and the time interval value to obtain a second a phase value, and adding the second phase value to the specific phase value to obtain a third phase value; and subtracting the phase value obtained by subtracting the third phase value from the first phase value as the first RRU a phase difference from the second RRU; wherein the time difference is a difference between the first reception time value and the second time reception value, the time interval value indicating the first The time interval between the time window and the second time window.

 Optionally, the specific phase value may specifically represent a phase in which the first test signal is rotated by the phase rotation in the first time window. For example, the phase of the first test signal rotated by the phase rotation in the first time window is 2π, and then the specific phase value is 2π, and the phase of the first test signal rotated by the phase rotation in the first time window. For 1 π, then the above specific phase value is 1 π.

 It should be noted that the phase rotated by the phase rotation of the second test signal in the second time window may be equivalent to the phase rotated by the phase rotation of the first test signal in the first time window, and may not be equivalent to the first The phase at which the test signal is rotated by the phase rotation in the first time window

 Optionally, the calculating unit 73 may specifically calculate a phase difference between the first RRU and the second RRU by using the following formula:

A0 = At - c + 0 _2l

 ι = - c-h

 And indicating a phase difference between the first RRU and the second RRU, At represents the time difference value, c represents the preset phase rotation speed, and represents the time interval value, and h represents the specific phase value.

 Optionally, the device may further include:

 An acquiring unit (not shown in the drawing), configured to acquire a phase between the first RRU and the second RRU according to a phase difference between the first RRU and the second RRU at a plurality of different time points Jitter state. The phase jitter state between the first RRU and the second RRU may specifically refer to a jitter state of a phase difference between the first RRU and the second RRU at different points. The jitter state can be used to better adjust the associated service sent by the first RRU and the second RRU (for example, the traffic transmitted in the CoMP transmission scenario) to synchronize the phases of the services sent by the first RRU and the second RRU.

 Optionally, the device may further include:

 a first configuration unit 74, configured to send, to the first RRU, first time window configuration information for configuring a length and/or a location of the first time window, so that the first RRU is according to the first Time window configuration information configuring a length and/or location of the first time window; and/or

a second configuration unit 75, configured to send, to the second RRU, the second time window for configuring Second time window configuration information of length and/or position such that the second RRU configures the length and/or position of the second time window in accordance with the second time window configuration information.

 In this way, the position of the first time window and/or the second time window can be configured, that is, the time interval between the first time window and the second time window can be configured to improve the phase difference between the first RRU and the second RRU. Precision.

 As described in FIG. 8, the method may further include:

 a third configuration unit 76, configured to send, to the first RRU, first rotation step size configuration information for configuring a rotation step of the phase rotation of the first test signal, so that the first RRU is according to the The first rotation step configuration information configures a rotation step of the first test signal; and/or

 a fourth configuration unit 77, configured to send second rotation step configuration information for configuring a rotation step of the phase rotation of the second test signal to the second RRU, so that the second RRU is according to the The second rotation step size configuration information configures a rotation step size of the second test signal.

 This makes it possible to improve the accuracy of the phase difference between the first RRU and the second RRU by configuring the rotation step of the first test signal and/or the rotation step of the second test signal.

 In the above technical solution, various alternative embodiments are introduced in the above embodiments, and both can improve the phase difference accuracy of the measurement. Please refer to FIG. 9. FIG. 9 is a schematic structural diagram of another phase measuring apparatus according to an embodiment of the present invention. As shown in FIG. 9, the method includes: a receiver 91 and a memory 92, and the receiver 91 and the memory 92, respectively. The connected processor 93 is configured to store a set of program codes, and the processor 93 is configured to invoke the program code to perform the following operations:

 Receiving, by the receiver 91, a first test signal sent by the first radio remote unit RRU in a first time window, and measuring power or amplitude of the first test signal received in the first time window a lowest received first receiving time value; wherein, the power or amplitude of the first test signal when the first RRU sends the first test signal is constant, and the phase of the first test signal is at a preset phase Rotation speed for phase rotation;

Receiving, by the receiver 91, a second test signal sent by the second RRU in a second time window, and measuring a power or amplitude of the second test signal received in the second time window a second receiving time value; wherein the second test signal sends the first number in the second RRU The power or amplitude of the second test signal is constant, and the phase of the second test signal is phase-rotated at the preset phase rotational speed;

 Calculating a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value; wherein, the time difference is the first receiving time value and The second time receives a difference between values, the time interval value representing a time interval between the first time window and the second time window.

 Optionally, the operation performed by the processor 93 to calculate a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value may include: Multiplying the preset phase rotation speed by the time difference to obtain a first phase value; multiplying the preset phase rotation speed by the time interval value to obtain a second phase value, and the second phase Adding a phase value to a specific phase value to obtain a third phase value;

 And a phase difference obtained by subtracting the third phase value from the first phase value is used as a phase difference between the first RRU and the second RRU.

 The operation performed by the processor 93 to calculate the phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value may include:

 The phase difference between the first RRU and the second RRU is calculated by the following formula:

A0 = At - c + 0 _2l

 ι = - c-h

 And indicating a phase difference between the first RRU and the second RRU, At represents the time difference value, c represents the preset phase rotation speed, and represents the time interval value, and h represents the specific phase value.

 Optionally, after performing the operation of calculating the phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value, the processor 93 further Can be used to do the following:

 Obtaining a phase jitter state between the first RRU and the second RRU according to a phase difference between the first RRU and the second RRU at a plurality of different time points.

The phase jitter state between the first RRU and the second RRU may specifically refer to a jitter state of a phase difference between the first RRU and the second RRU at different time points. The jitter state can be used to better adjust the associated service sent by the first RRU and the second RRU (for example: in CoMP transmission) The traffic transmitted in the scenario is transmitted to synchronize the phases of the services sent by the first RRU and the second RRU. Optionally, as shown in FIG. 10, the apparatus further includes a transmitter 94, where the processor 93 is further configured to perform the following operations:

 Transmitting, by the transmitter 94, first time window configuration information for configuring a length and/or a location of the first time window to the first RRU, such that the first RRU is according to the first time window The configuration information configures the length and/or location of the first time window; and/or

 Transmitting, by the transmitter 94, second time window configuration information for configuring a length and/or a position of the second time window to the second RRU, such that the second RRU is according to the second time window The configuration information configures the length and/or location of the second time window.

 Referring to FIG. 10, the device further includes a transmitter 94, and the processor 93 is further configured to perform the following operations:

 Transmitting, by the transmitter 94, first rotation step configuration information for configuring a rotation step of phase rotation of the first test signal to the first RRU, so that the first RRU is according to the first Rotating the step size configuration information to configure a rotation step of the first test signal; and/or

 Transmitting, by the transmitter 94, second rotation step configuration information for configuring a rotation step of phase rotation of the second test signal to the second RRU, so that the second RRU is according to the second The rotation step size configuration information configures a rotation step size of the second test signal.

In the foregoing technical solution, the first test signal sent by the first RRU is received in the first time window, and the first power or the amplitude of the first test signal received in the first time window is measured to be the first Receiving a time value; receiving a second test signal sent by the second RRU in the second time window, and measuring a second receive when the power or amplitude of the second test signal received in the second time window is the lowest a time value; calculating a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value. In this way, the test signal sent by the RRU can be directly measured to calculate the phase difference between the RRUs. Compared with the prior art, the phase difference is fed back by using the air interface resource by the user equipment, and the embodiment of the present invention can improve the phase difference precision of the measurement to meet the requirements. Performance requirements for collaborative communications. Please refer to FIG. 11. FIG. 11 is a schematic structural diagram of a phase measurement system according to an embodiment of the present invention. As shown in FIG. 11, the method includes: a first RRU 111, a second RRU 112, and a measuring device 113, where: a first RRU 111, configured to send a first test signal to the measuring device 113 in a first time window, where the first test signal has a constant power or amplitude when the first RRU sends the first test signal And the phase of the first test signal is phase rotated at a preset phase rotation speed;

 a measuring device 113, configured to measure a first receiving time value when the power or amplitude of the first test signal received in the first time window is the lowest;

 a second RRU 112, configured to send a second test signal to the measuring device in a second time window, where the power or amplitude of the second test signal when the second RRU sends the second test signal is constant, And the phase of the second test signal is phase rotated at the preset phase rotation speed;

 The measuring device 113 is further configured to measure a second receiving time value when the power or amplitude of the second test signal received in the second time window is the lowest;

 The measuring device 113 is further configured to calculate a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value; wherein the time difference is a difference between the first received time value and the second time received value, the time interval value representing a time interval between the first time window and the second time window.

 Optionally, the measuring device 113 may be a phase measuring device according to any one of the embodiments shown in FIG. 6-10.

 In the above technical solution, the measuring device receives the first test signal sent by the first RRU in the first time window, and measures the power or amplitude of the first test signal received in the first time window. a first receiving time value; the measuring device receives the second test signal sent by the second RRU in the second time window, and measures the power or amplitude of the second test signal received in the second time window to be the lowest a second receiving time value; the measuring device calculates a phase difference between the first RRU and the second RRU according to the preset phase rotation speed, the time difference value, and the time interval value. In this way, the test signal sent by the RRU can be directly measured to calculate the phase difference between the RRUs. Compared with the prior art, the phase difference is fed back by using the air interface resources by the user equipment, and the embodiment of the present invention can improve the accuracy of the measured phase difference to meet the requirements. Performance requirements for collaborative communications.

A person skilled in the art can understand that all or part of the process of implementing the foregoing embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a calculation. The machine can be read into a storage medium, and when executed, the program can include the flow of an embodiment of the methods as described above. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (Random Access Memory).

 The above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and the equivalent changes made by the claims of the present invention are still within the scope of the present invention.

Claims

Rights request 1. A phase measurement method, characterized by including: Receive the first test signal sent by the first remote radio unit RRU within the first time window, and measure the first reception when the power or amplitude of the first test signal received within the first time window is the lowest. time value; wherein, the power or amplitude of the first test signal when the first RRU sends the first test signal is constant, and the phase of the first test signal is phase rotated at a preset phase rotation speed; Receive the second test signal sent by the second RRU within the second time window, and measure the second reception time value when the power or amplitude of the second test signal received within the second time window is the lowest; wherein , the power or amplitude of the second test signal is constant when the second RRU sends the second test signal, and the phase of the second test signal is phase rotated at the preset phase rotation speed; The phase difference between the first RRU and the second RRU is calculated according to the preset phase rotation speed, time difference value and time interval value; wherein, the time difference value is the first receiving time value and The difference between the second time reception values, the time interval value represents the time interval between the first time window and the second time window. 2. The method of claim 1, wherein the phase difference between the first RRU and the second RRU is calculated based on the preset phase rotation speed, time difference value and time interval value. , include: Multiply the preset phase rotation speed and the time difference value to obtain a first phase value; Multiply the preset phase rotation speed and the time interval value to obtain a second phase value, and The second phase value is added to the specific phase value to obtain the third phase value; The phase difference obtained by subtracting the third phase value from the first phase value is used as the phase difference between the first RRU and the second RRU. 3. The method of claim 1, wherein the phase difference between the first RRU and the second RRU is calculated based on the preset phase rotation speed, time difference value and time interval value. Afterwards, the method further includes: The phase jitter state between the first RRU and the second RRU is obtained according to the phase differences between the first RRU and the second RRU at multiple different time points. 4. The method according to any one of claims 1 to 3, characterized in that, the method further comprises: sending to the first RRU a message for configuring the length and/or position of the first time window. First time window configuration information, so that the first RRU configures the length and/or position of the first time window according to the first time window configuration information; and/or Send second time window configuration information for configuring the length and/or position of the second time window to the second RRU, so that the second RRU configures the first time window according to the second time window configuration information. 2. The length and/or location of the time window. 5. The method according to any one of claims 1-3, characterized in that, the method further comprises: sending to the first RRU a rotation step for configuring the phase rotation of the first test signal. The first rotation step configuration information, so that the first RRU configures the rotation step of the first test signal according to the first rotation step configuration information; and/or Send second rotation step configuration information for configuring the rotation step of the phase rotation of the second test signal to the second RRU, so that the second RRU is configured according to the second rotation step configuration information The rotation step size of the second test signal. 6. A phase measurement device, characterized in that it includes: a first measurement unit, a second measurement unit and a calculation unit, wherein: The first measurement unit is configured to receive the first test signal sent by the first remote radio unit RRU within the first time window, and measure the first test signal received within the first time window. The first reception time value when the power or amplitude is the lowest; wherein, the power or amplitude of the first test signal when the first RRU sends the first test signal is constant, and the phase of the first test signal is with Preset phase rotation speed for phase rotation; The second measurement unit is configured to receive the second test signal sent by the second RRU within the second time window, and measure the lowest power or amplitude of the second test signal received within the second time window. The second reception time value is when the second RRU sends the second test signal; The power or amplitude of the second test signal is constant, and the phase of the second test signal is phase rotated at the preset phase rotation speed; The calculation unit is configured to calculate the phase difference between the first RRU and the second RRU according to the preset phase rotation speed, time difference value and time interval value; wherein the time difference value is The difference between the first reception time value and the second time reception value, and the time interval value represents the time interval between the first time window and the second time window. 7. The device of claim 6, wherein the calculation unit is further configured to multiply the preset phase rotation speed and the time difference to obtain a first phase value; and multiply the preset phase rotation speed by the time difference. Assume that the phase rotation speed is multiplied by the time interval value to obtain a second phase value, and the second phase value is added to a specific phase value to obtain a third phase value; and the first phase value is subtracted from the The phase difference obtained by the third phase value is used as the phase difference between the first RRU and the second RRU. 8. The device according to claim 6, characterized in that, the device further includes: An acquisition unit, configured to acquire the phase jitter state between the first RRU and the second RRU based on the phase differences between the first RRU and the second RRU at multiple different time points. 9. The device according to any one of claims 6 to 8, characterized in that, the device further includes: a first configuration unit, configured to send to the first RRU information for configuring the first time window. the first time window configuration information of the length and/or position, so that the first RRU configures the length and/or position of the first time window according to the first time window configuration information; and/or A second configuration unit configured to send second time window configuration information for configuring the length and/or position of the second time window to the second RRU, so that the second RRU configures the second time window according to the second time window. The window configuration information configures the length and/or position of the second time window. 10. The device according to any one of claims 6-8, characterized in that the device further includes: a third configuration unit, configured to send the first test signal to the first RRU for configuring the first test signal. The first rotation step configuration information of the rotation step of the phase rotation, so that the first RRU configures the rotation step of the first test signal according to the first rotation step configuration information; and/or The fourth configuration unit is configured to send second rotation step configuration information for configuring the rotation step of the phase rotation of the second test signal to the second RRU, so that the second RRU configures the rotation step according to the second test signal. The second rotation step configuration information configures the rotation step of the second test signal. 11. A phase measurement system, characterized in that it includes: a first RRU, a second RRU and a measurement device, wherein: The first RRU is configured to send a first test signal to the measurement device within a first time window, wherein the power or amplitude of the first test signal when the first RRU sends the first test signal constant, and the phase of the first test signal is phase rotated at a preset phase rotation speed; the measurement device is used to measure the power or amplitude of the first test signal received within the first time window. The lowest first reception time value; The second RRU is configured to send a second test signal to the measurement device within a second time window, wherein the power or amplitude of the second test signal when the second RRU sends the second test signal is constant, and the phase of the second test signal performs phase rotation at the preset phase rotation speed; The measuring device is also used to measure the second reception time value when the power or amplitude of the second test signal received within the second time window is the lowest; The measuring device is also used to calculate the phase difference between the first RRU and the second RRU according to the preset phase rotation speed, time difference value and time interval value; wherein the time difference value is The difference between the first reception time value and the second time reception value, and the time interval value represents the time interval between the first time window and the second time window. 12. A phase measurement device, characterized in that it includes: a receiver and a memory, and a processor connected to the receiver and the memory respectively, wherein the memory is used to store a set of program codes, and the processor uses To call the program code, perform the following operations: The receiver receives the first test signal sent by the first remote radio unit RRU within the first time window, and measures the lowest power or amplitude of the first test signal received within the first time window. The first reception time value when; wherein, the power or amplitude of the first test signal when the first RRU sends the first test signal is constant, and the phase of the first test signal is with a predetermined Set the phase rotation speed to perform phase rotation; Receive the second test signal sent by the second RRU in the second time window through the receiver, and measure the second test signal when the power or amplitude of the second test signal received in the second time window is the lowest. Reception time value; wherein, the power or amplitude of the second test signal when the second RRU sends the second test signal is constant, and the phase of the second test signal is performed at the preset phase rotation speed. phase rotation; The phase difference between the first RRU and the second RRU is calculated according to the preset phase rotation speed, time difference value and time interval value; wherein, the time difference value is the first receiving time value and The difference between the second time reception values, the time interval value represents the time interval between the first time window and the second time window. 13. The device according to claim 12, wherein the processor performs calculation of the first RRU and the second RRU based on the preset phase rotation speed, time difference value and time interval value. Phase difference operations include: Multiply the preset phase rotation speed and the time difference value to obtain a first phase value; Multiply the preset phase rotation speed and the time interval value to obtain a second phase value, and The second phase value is added to the specific phase value to obtain the third phase value; The phase difference obtained by subtracting the third phase value from the first phase value is used as the phase difference between the first RRU and the second RRU. 14. The device according to claim 12, wherein the processor calculates the difference between the first RRU and the first RRU according to the preset phase rotation speed, time difference value and time interval value after completing the execution. After the operation of the phase difference between the second RRU, it is also used to perform the following operations: The phase jitter state between the first RRU and the second RRU is obtained according to the phase difference between the first RRU and the second RRU at multiple different time points. 15. The device according to any one of claims 12-14, wherein the device further includes a transmitter, and the processor is further configured to perform the following operations: The length and/or length used to configure the first time window is sent to the first RRU through the transmitter. or the first time window configuration information of the location, so that the first RRU configures the length and/or location of the first time window according to the first time window configuration information; and/or Send second time window configuration information for configuring the length and/or position of the second time window to the second RRU through the transmitter, so that the second RRU is configured according to the second time window The information configures the length and/or location of the second time window. 16. The device according to any one of claims 12-14, wherein the device further includes a transmitter, and the processor is further configured to perform the following operations: The first rotation step configuration information for configuring the rotation step of the phase rotation of the first test signal is sent to the first RRU through the transmitter, so that the first RRU is configured according to the first rotation The step size configuration information configures the rotation step size of the first test signal; and/or The second rotation step configuration information for configuring the rotation step of the phase rotation of the second test signal is sent to the second RRU through the transmitter, so that the second RRU is configured according to the second rotation The step size configuration information configures the rotation step size of the second test signal.