WO2014183662A1 - 一种信号调整方法及装置、小区 - Google Patents

一种信号调整方法及装置、小区 Download PDF

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Publication number
WO2014183662A1
WO2014183662A1 PCT/CN2014/077590 CN2014077590W WO2014183662A1 WO 2014183662 A1 WO2014183662 A1 WO 2014183662A1 CN 2014077590 W CN2014077590 W CN 2014077590W WO 2014183662 A1 WO2014183662 A1 WO 2014183662A1
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WO
WIPO (PCT)
Prior art keywords
power
cell
correction signal
unit
adjustment
Prior art date
Application number
PCT/CN2014/077590
Other languages
English (en)
French (fr)
Inventor
官鹭
易雄书
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2016513221A priority Critical patent/JP6148793B2/ja
Priority to EP14797060.2A priority patent/EP2991412A4/en
Priority to KR1020157034966A priority patent/KR101751630B1/ko
Publication of WO2014183662A1 publication Critical patent/WO2014183662A1/zh

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/10Monitoring; Testing of transmitters
    • H04B17/11Monitoring; Testing of transmitters for calibration
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/10Monitoring; Testing of transmitters
    • H04B17/101Monitoring; Testing of transmitters for measurement of specific parameters of the transmitter or components thereof
    • H04B17/102Power radiated at antenna
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/24TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/243TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
    • H04W52/244Interferences in heterogeneous networks, e.g. among macro and femto or pico cells or other sector / system interference [OSI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/10Monitoring; Testing of transmitters
    • H04B17/11Monitoring; Testing of transmitters for calibration
    • H04B17/13Monitoring; Testing of transmitters for calibration of power amplifiers, e.g. gain or non-linearity
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/20Monitoring; Testing of receivers
    • H04B17/21Monitoring; Testing of receivers for calibration; for correcting measurements

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a signal adjustment method and apparatus, and a cell. Background technique
  • the base station side may include a baseband unit (BBU) and a remote radio unit (RRU).
  • BBU baseband unit
  • RRU remote radio unit
  • the BBU and the RRU are connected by optical fibers, and one BBU may be connected to multiple RRUs.
  • This multi-channel solution of BBU+RRU can solve the indoor coverage problem of large buildings.
  • the RRU has two types of RF channels: one is a radio channel for normal service communication, which is called a service channel, including a service transmission channel and a service receiving channel; and one is used for correcting the service channel.
  • the RF channel called the correction channel
  • the RRU correction process can be further divided into a single RRU self-correction and a multi-RRU joint correction.
  • the single RRU self-correction is to ensure that the ratio of the transmit channel response and the receive channel response of any two RF channels in the system cell is the same; and the multiple RRU joint correction is to ensure any two RF channels between multiple system cells.
  • the ratio of the channel response to the channel response is the same.
  • the way of using different types of RRUs is also different.
  • the RRU is called an external correction RRU.
  • the RRU can be implemented by interfacing with other RRUs via the correction channel and the correction interface.
  • Joint correction If the correction channel does not have a correction interface outside the RRU, then this type of RRU is called an internal correction RRU.
  • the transmission channel of the service channel has a high power amplifier, and the receiving channel has a low noise amplifier. Therefore, the correction signal undergoes two processes of high power amplifier and low noise during the transmission process, so that the joint correction has the following problems:
  • the received correction signal may be too large, so that the RF front end is saturated.
  • the received correction signal may be too small. , causing the signal correction signal to be flooded. That is to say, when the internal correction RRU performs joint correction, the strength of the received correction signal is very high, and the signal Too large or too small will affect the normal reception of the correction signal, and ultimately affect the implementation of multi-RRU joint correction.
  • the signal adjustment method and device, and the cell of the embodiment of the invention are used to ensure the normal implementation of the joint correction of multiple remote radio units by adjusting the signal power.
  • an embodiment of the present invention provides a signal adjustment method, which is used to adjust a power of a first cell to transmit a correction signal, where the method includes:
  • the adjusting the power of transmitting the correction signal according to the determining result includes: The power adjustment indication gradually adjusts the power of transmitting the correction signal according to a preset step size until the power of the correction signal received by the second cell matches the reference power.
  • the adjusting the power of transmitting the correction signal according to the determination result includes:
  • the first cell adjusts the power of transmitting the correction signal according to the adjustment value according to the power adjustment indication.
  • the manner in which the first cell adjusts the power of transmitting the correction signal is:
  • the power to transmit the correction signal is adjusted by an attenuator and/or the power of the correction signal is adjusted by a digital domain baseband signal.
  • the determining, by the second cell, whether the power of the received correction signal matches the reference power includes:
  • the remote radio unit of the second cell receives the correction signal, and determines, by the baseband unit of the second cell, whether the power of the correction signal matches the reference power.
  • the first cell receives a determination result returned by the second cell, And adjusting the power of transmitting the correction signal according to the determination result, including:
  • the remote radio unit of the first cell receives the determination result, and the baseband unit of the first cell controls the remote radio unit of the first cell to adjust the power of transmitting the correction signal according to the determination result.
  • an embodiment of the present invention provides a signal adjustment method, which is used to adjust a power of a first cell to receive a correction signal, where the method includes:
  • the first cell measures the received power of the correction signal, and determines whether the power matches the reference power. If not, adjusts the power of the first cell to receive the correction signal, so that the first cell The power of the correction signal received by the cell corresponds to the reference power.
  • the adjusting the power of the first cell to receive the correction signal includes:
  • the first cell gradually adjusts the power of the correction signal according to the preset step size until the power of the correction signal received by the first cell matches the reference power.
  • the adjusting the power of the first cell to receive the correction signal includes:
  • the first cell calculates a difference between the received power of the correction signal and the reference power, and adjusts, according to the difference, the power of the first cell to receive the correction signal.
  • the adjusting, by the first cell, the power of the correction signal is:
  • the power of receiving the correction signal is adjusted by an attenuator.
  • the first cell measures a received power of the correction signal, and Determining whether the power is consistent with the reference power, including: The baseband unit of the first cell measures the power of the correction signal received by the remote radio unit of the first cell, and determines whether the power matches the reference power.
  • the adjusting, by the first cell, the power of the correction signal includes:
  • the baseband unit of the first cell controls the remote radio unit of the first cell to adjust the power of receiving the correction signal.
  • an embodiment of the present invention provides a signal adjusting apparatus, configured to adjust a power of a first cell to transmit a correction signal, where the apparatus includes a transmitting unit, a receiving unit, a control unit, and an adjusting unit;
  • the transmitting unit is configured to send a correction signal to the second cell according to the preset power, so that the second cell determines whether the power of the received correction signal matches the reference power;
  • the receiving unit is configured to receive a determination result returned by the second cell
  • the control unit is configured to: when the determining result received by the receiving unit indicates that the power of the correction signal received by the second cell does not match the reference power, the adjusting unit is configured to adjust the transmitting unit according to the determining result. Transmitting the power of the correction signal such that the power of the correction signal received by the second cell matches the reference power.
  • the control unit is specifically configured to control, by the adjusting unit, to gradually adjust, according to the power adjustment indication, the power of the transmitting unit to transmit the correction signal according to a preset step, until the correction signal received by the second cell is received.
  • the power is consistent with the reference power.
  • the determination result includes a power adjustment indication and an adjustment value
  • the control unit is specifically configured to control the adjusting unit to adjust, according to the power adjustment indication, the power of the transmitting unit to transmit the correction signal according to the adjustment value.
  • an embodiment of the present invention provides a signal adjustment apparatus, configured to adjust a power of a first cell to receive a correction signal, where the apparatus includes a receiving unit, a determining unit, a control unit, and an adjusting unit;
  • the receiving unit is configured to receive a correction signal sent by the second cell
  • the determining unit is configured to measure power of the correction signal received by the receiving unit, and Determining whether the power matches the reference power;
  • the control unit is configured to, when the determining unit determines that the powers do not match, control the adjusting unit to adjust the power of the receiving unit to receive the correction signal, so that the power of the correction signal received by the receiving unit Corresponding to the reference power.
  • control unit is specifically configured to control the adjusting unit to gradually adjust the power of the receiving unit to receive the correction signal according to a preset step, until the The power of the correction signal received by the receiving unit is paid in accordance with the reference power.
  • control unit is specifically configured to calculate a difference between a power of the correction signal received by the receiving unit and the reference power, and control the adjustment The unit adjusts the power of the receiving unit to receive the correction signal according to the difference.
  • an embodiment of the present invention provides a cell, where the cell includes a baseband unit and at least one remote radio unit, where the remote radio unit includes a service channel, and the service channel corresponds to one that can communicate with other cells.
  • External interface the remote radio unit includes a service channel, and the service channel corresponds to one that can communicate with other cells.
  • the remote radio unit further includes a power adjustment module, and the power adjustment module is serially connected between the service channel of any remote radio unit and the external interface;
  • the power adjustment module is configured to adjust power of the cell transmission correction signal under control of the baseband unit, or to adjust power of the cell receiving the correction signal under control of the baseband unit.
  • the power adjustment module includes a first switch circuit, a second switch circuit, and a power adjustment submodule;
  • the first switch circuit is directly connected to the second switch circuit to form a first branch; the first switch circuit is connected to the second switch circuit via the power adjustment sub-module to form a second branch; The first switch circuit is further connected to a service channel, and the second switch circuit is further connected to an external interface corresponding to the service channel.
  • the signal adjustment method and device and the cell implemented by the present invention use the reference power expected by the receiving end as a criterion to ensure that the receiving end can be adjusted by adjusting the power of the transmitting end RRU to transmit the corrected signal or adjusting the power of the receiving end RRU to receive the corrected signal.
  • the channel correction signal transmitted by the transmitting end is normally received, and the subsequent multi-RRU joint correction process is normally performed.
  • Embodiment 1 is a flow chart of Embodiment 1 of a signal adjustment method of the present invention.
  • Embodiment 2 is a flow chart of Embodiment 2 of the signal adjustment method of the present invention.
  • FIG. 3 is a schematic structural view of a remote radio unit of the present invention.
  • Figure 5 is a schematic view of Embodiment 1 of the signal adjusting device of the present invention.
  • Figure 6 is a schematic view showing Embodiment 2 of the signal adjusting device of the present invention.
  • Figure 7 is a schematic view showing Embodiment 3 of the signal adjusting device of the present invention.
  • Figure 8 is a block diagram showing the hardware configuration of Embodiment 1 of the signal adjusting apparatus of the present invention.
  • Figure 9 is a block diagram showing the hardware configuration of Embodiment 2 of the signal adjusting apparatus of the present invention.
  • Fig. 10 is a block diagram showing the hardware configuration of a third embodiment of the signal adjusting apparatus of the present invention. detailed description
  • the base station may first estimate the uplink channel by detecting the sounding reference signal SRS (Sounding Eference Signal) sent by the user equipment, and then use the TDD system.
  • SRS Sounding reference signal
  • the reciprocity of uplink and downlink, the estimated uplink channel is used as a downlink channel for beamforming.
  • the uplink and downlink of the TDD system are reciprocal, in actual applications, the uplink and downlink channels respectively introduce different RF channels of the base station, and the responses of the RF channels are different, and if the response of any two RF channels is different, Different from the response of the receiving channel, it will affect the final launching effect. Therefore, it is necessary to compensate each RF channel, that is, to perform channel correction.
  • Coordinated Multi-Point CoMP is a key feature of the Long Term Evolution (LTE) system.
  • the base station side of the LTE system can include at least one base station cell, and each base station cell has a baseband unit BBU (Base Band). Unit ) , and multiple remote radio units (RRUs) connected to the BBU.
  • BBU Base Band
  • RRUs remote radio units
  • Jointly send JT Joint As a kind of CoMP technology, Transmission technology can significantly improve the service quality and average throughput of cell edge users.
  • channel correction is also required, and unlike the single-cell beamforming technology, the JT technology requires the ratio of the transmission and reception RF channel responses corresponding to the antennas of the multiple cells. the same. Even if channel correction is performed in each cell, if the inter-cell correction is not performed, the JT technology cannot reach the desired performance, that is, multiple RRU joint correction is required.
  • the correction signal is transmitted between any two RRUs.
  • the correction signal is transmitted by the transmitting RRU service channel for high power amplifier, and is received. It is required to be low-noise by the service channel of the receiving end RRU.
  • the power after the correction signal is subjected to the high power amplifier and the low noise amplifier must meet the expectations of the receiving end RRU, that is, it must be met. Baseline power, otherwise the subsequent joint correction process will not be possible.
  • Embodiment 1 of a signal adjustment method according to the present invention is shown.
  • the method mainly implements a signal adjustment process from a correction signal transmitting end, that is, the method is mainly used to adjust a first cell. Transmitting the power of the correction signal, the method comprising:
  • Step 101 The first cell sends a correction signal to the second cell according to the preset power, so that the second cell determines whether the power of the received correction signal matches the reference power.
  • the correction signal is to be transmitted between two cells, where the cell that transmits the correction signal can be defined as the first cell, and the cell that receives the correction signal is defined as the second.
  • the power of the correction signal received by the second cell is matched with the reference power in order to implement the subsequent joint correction process.
  • the RRU that specifically performs the transmitting action in the first cell is defined as the first RRU, and the BBU connected thereto is defined as the first BBU; the RRU that specifically performs the receiving action in the second cell is defined as the first The second RBU and the BBU connected to it are defined as the second BBU.
  • the specific implementation process of this step is as follows:
  • the first BBU controls the first RRU to transmit a correction signal to the second RRU according to the preset power, and then the correction signal is radiated through the antenna corresponding to the first RRU, and passes through the air interface.
  • the transmission is finally received by the antenna of the second RRU, and then the power of the correction signal received by the second RRU is determined by the second BBU and compared with the expected reference power. If the two match, the second cell is considered to be able to utilize the The signal of the power is jointly corrected, and the transmit power of the first RRU does not need to be adjusted. If the two do not match, the second cell cannot be jointly corrected by using the signal of the power, and the transmit power of the first RRU needs to be adjusted.
  • the second BBU controls the second RRU to feed back the first RRU to indicate the result of the determination that the signal adjustment needs to be performed, thereby adjusting the transmit power of the first RRU.
  • the preset power of the first RRU transmission correction signal is 40 dB
  • the signal loss during air interface transmission is 70 dB
  • the air interface loss is the isolation between the two RRUs.
  • the air interface loss does not change substantially.
  • the power of the correction signal received by the second RRU is -30 dB. If the reference power is -60 dB, the power of the correction signal received by the second RRU is -30 dB different from the reference power, which is obviously inconsistent. Therefore, the second RRU returns a judgment result signal indicating that the power does not match to the first RRU.
  • the correspondence in the present invention can be understood as that the power of the correction signal received by the second RRU is within a threshold interval determined by the reference power, and is not necessarily strictly equal to the reference power.
  • the determination result that the power of the correction signal is equal to the reference power is determined, and the present invention does not limit this.
  • Step 102 The first cell receives a determination result returned by the second cell, and adjusts according to the determination result when the determination result indicates that the power of the correction signal received by the second cell does not match the reference power. Transmitting the power of the correction signal such that the power of the correction signal received by the second cell matches the reference power.
  • the first RRU forwards the judgment result of the second RRU feedback to the first BBU. If the judgment result indicates that the power does not match, the first BBU adjusts the power of the first RRU transmission correction signal according to the determination result, and finally causes the second cell to receive. The power of the correction signal corresponds to the reference power.
  • the judgment result of the second RRU feedback may have the following two understandings: First, regardless of whether the powers match, the second RRU feeds back the judgment result to the first RRU, and accordingly, the first BBU receives the same. After the judgment result, it is necessary to first recognize whether the judgment result indicates whether the power matches or does not match, that is, whether the first RRU transmission correction signal is to be adjusted. The power is then processed for further processing.
  • the second RRU can only feed back the judgment result to the first RRU if the power does not match, that is, the first BBU can directly start and adjust the first RRU transmission as long as the judgment result is received.
  • the process of power is that the second RRU can only feed back the judgment result to the first RRU if the power does not match, that is, the first BBU can directly start and adjust the first RRU transmission as long as the judgment result is received. The process of power.
  • the method for the second RRU feedback judgment result is not limited, and the process of adjusting the transmission power of the first cell can be accurately controlled when the power needs to be adjusted.
  • correction signal in this embodiment can be understood as a signal for correcting signal power, that is, any reference signal in a general sense, and can also be understood as a channel for performing joint correction. Correcting the signal, however, the purpose of adjusting the signal power in this embodiment can be achieved regardless of the specific signal, except that
  • the first BBU also controls the first RRU to determine a good transmit power to transmit a channel correction signal for joint correction to the second RRU. . That is, after the second BBU determines that the powers match, the second RRU is controlled to feed back a signal to the first RRU, so that the first RRU initiates a joint correction process, and transmits a channel correction signal to the second RRU according to the determined power.
  • the subsequent joint correction process can be directly performed by using the signal that meets the expectation without notifying the first RRU, which can simplify the signal adjustment process to some extent.
  • the channel correction signal for the subsequent joint correction process is directly used for signal adjustment, thereby ensuring the authenticity and accuracy of the determined power adjustment amount.
  • the second cell receiving the correction signal determines whether the correction signal transmitted by the first cell meets the usage requirement, and feeds the determination result to the first cell, and controls the first cell to adjust the time and time accurately when needed.
  • the transmit power in order to ensure joint correction, the second cell can accurately receive and identify the channel correction signal transmitted by the first cell, thereby completing the multi-RRU joint correction process.
  • the inventive solution can also be used to ensure the joint between multiple externally corrected RRUs.
  • the normal implementation of the calibration process The following describes the manner in which step 102 in the embodiment adjusts the first RRU transmission power according to the determination result. According to the content included in the judgment result, the present invention provides the following two ways of adjusting the transmission power.
  • the transmit power of the first RRU may be gradually adjusted according to the preset step according to the power adjustment indication, until the power of the correction signal received by the second cell is matched with the reference power, That is, the transmit power is adjusted in a step-by-step manner.
  • the power adjustment indication may be embodied by two types of power up indication or power down indication.
  • the second BBU controls the second RRU to feed back the determination result including the power down indication to the first RRU, and after receiving the determination result, the first RRU forwards the result to the first BBU to identify another 'j, the first BBU first clears its current
  • the transmit power of the first RRU needs to be adjusted.
  • the first RRU continues to adjust its transmission power according to the step of 10 dB under the control of the first BBU, and transmits the correction signal with the power of 20 dB after the second reduction, for the second BBU to judge.
  • the second RRU determines that the power of the correction signal received by the second RRU is not in accordance with the expectation
  • the second RRU is further controlled to continue to feed back the determination result including the power down indication to the first RRU, and so on.
  • the second BBU determines that the power of the correction signal received by the second RRU matches the reference power.
  • the requirement of the second cell can be satisfied by controlling the first RRU to be adjusted 3 times.
  • the transmit power of the first RRU is adjusted to 10 dB, and after 70 dB of the air interface transmission loss, the power of the correction signal received by the second RRU is -60 dB, which is equal to the reference power. This concludes the signal adjustment process of the present invention.
  • the first RRU can transmit a channel correction signal to the second RRU with a power of 10 dB.
  • the adjustment step when adjusting the signal power in this mode, if the signal adjustment speed is higher, the adjustment step can be set slightly larger; if the signal adjustment accuracy is higher, the adjustment step can be adjusted.
  • the length setting is slightly smaller, and the user can flexibly set the adjustment step according to the actual usage.
  • the invention is not limited thereto.
  • the power of the first RRU transmission correction signal may be adjusted according to the adjustment value according to the power adjustment indication.
  • the power adjustment indication may be embodied by two types of power up indication or power down indication, and the adjustment value is obtained by the second BBU calculation.
  • the method is the same as the method of lowering the transmission power, but the power adjustment indication is set to the power up indication, which is not described here.
  • the manner in which the first BBU adjusts the first RRU transmit power may be: adjusting the power of the first RRU transmit correction signal by adjusting the attenuator, and/or adjusting the power of the digital domain baseband signal. The power of the first RRU transmission correction signal is adjusted.
  • the adjustment range of the digital domain is small, about 10 ⁇ 20dB, and it is necessary to ensure that the transmission power is reduced and the signal distortion cannot occur at the same time, that is, the transmission power should be adjusted while ensuring the accuracy of the signal.
  • the adjustment range of the attenuator is not only large but also flexible, and it is preferable to use an attenuator to adjust the transmission power.
  • the power can be adjusted in two ways.
  • the adjustment range of the digital domain is 15 dB
  • the adjustment range of the attenuator is 60 dB
  • the adjustment value of the second RRU feedback to the first RRU is -75 dB, so that the digital domain can be down-regulated.
  • attenuator implementation Referring to FIG. 2, a flow chart of Embodiment 2 of the signal adjustment method of the present invention is shown.
  • the method is mainly used to adjust the signal receiving process, that is, the method is mainly used to adjust the first cell.
  • Receiving the power of the correction signal the method comprising:
  • Step 201 The first cell receives a correction signal sent by a second cell.
  • Step 202 The first cell measures the received power of the correction signal, and determines whether the power matches the reference power. If not, adjusts the power of the first cell to receive the correction signal. The power of the correction signal received by the first cell is consistent with the reference power.
  • the correction signal also needs to be transmitted between two cells when implemented, except that the cell receiving the correction signal is defined as the first cell, and the transmission is corrected.
  • the cell of the signal is defined as the second cell.
  • the power of the correction signal received by the first cell is finally paid in accordance with the reference power.
  • the RRU that performs the receiving action in the first cell is defined as the first RRU, and the BBU connected to it is defined as the first BBU; the RRU that specifically performs the transmitting action in the second cell is defined as the first
  • the second RBU and the BBU connected to it are defined as the second BBU.
  • the specific implementation process of this step is as follows:
  • the second BBU controls the second RRU to transmit the correction signal to the first RRU according to the preset power, and the correction signal is radiated through the antenna corresponding to the second RRU, and is finally received by the antenna of the first RRU after being transmitted through the air interface. Further, the first BBU clarifies the power of the correction signal received by the first RRU, and compares with the expected reference power. If the two match, the first cell can be considered to perform joint correction using the signal of the power, without adjusting the first The received power of an RRU; if the two do not match, it is considered that the first cell cannot use the signal of the power for joint correction, and the received power of the first RRU needs to be adjusted.
  • the preset power of the second RRU transmission correction signal is 40 dB
  • the signal loss during the air interface transmission is 70 dB
  • the air interface loss is the isolation between the two RRUs.
  • the air interface loss does not substantially change.
  • the power of the correction signal received by the first RRU is -30 dB. If the reference power is -60 dB, the power of the correction signal received by the first RRU is -30 dB different from the reference power, which is obviously inconsistent. Therefore, it is necessary to adjust the power of the first RRU to receive the correction signal.
  • the first RRU of the receiving end does not need to feed back the determination result to the second RRU of the transmitting end. After the first BBU determines that the power needs to be adjusted, the receiving end completes the adjustment process, and the first RRU receives the correction signal. power.
  • the signal modulation method of the present embodiment is to explicitly determine whether the received power needs to be adjusted during the current receiving and transmitting process, and the specific adjustment process is implemented in the next receiving and transmitting process. That is, when the second RRU transmits the correction signal to the first RRU next time, the first RRU first adjusts the received power by using the previous judgment result, and then forwards the received correction signal to the first BBU for power. Whether the judgment is consistent.
  • the correction signal in this embodiment preferably refers to a channel correction signal used for joint correction, so that after the first RRU adjusts it to match the reference power, the signal can be directly used for subsequent
  • the joint calibration process simplifies the signal adjustment process to the greatest extent possible.
  • the correction signal may also be any reference signal in a general sense. If the correction signal is a reference signal, after the first RRU determines that it meets its desired received power, it also informs the second RRU to continue transmitting a channel correction signal thereto, and accordingly, the first RRU is to receive the channel correction signal. Receiving the channel correction signal with a determined power and forwarding it to the first BBU, and performing a subsequent joint correction process using the channel correction signal.
  • the first RRU can also adjust the power of the received correction signal in two ways.
  • the first BBU controls the first RRU to gradually adjust the power of the received correction signal according to the preset step size, so that the power of the received correction signal is matched with the reference power, that is, the power is adjusted in a step-by-step manner. It can be embodied as either up-regulating power or down-regulating power.
  • the BBU continues to compare with the reference power of -60dB and finds that it still needs to continue to be down-regulated. Therefore, when the second RRU transmits the correction signal to the first RRU for the third time, it starts.
  • the first RRU attempts to adjust 3 times to meet the usage requirements of the subsequent joint correction.
  • the first BBU calculates a difference between the power of the correction signal received by the first RRU and the reference power, and controls the first RRU to adjust the received power according to the difference.
  • the signal is subjected to a subsequent joint correction process.
  • the received power may be up-regulated.
  • the implementation is the same as the method of lowering the power, and is not described here.
  • the first BBU may adjust the power of the first RRU reception correction signal by adjusting the attenuator; or may adjust the power of the first RRU reception correction signal by using a manner in which the first cell and the second cell cooperate. For example, if the above-mentioned adjustment of the attenuator of the first cell is 60 dB, simply adjusting the attenuator of the first cell does not match the received correction signal power with the reference power. In this case, the first cell should also inform the second cell to adjust the power of its transmission correction signal to cooperate with the first cell. It should be noted that the second cell can adjust its transmit power by adjusting the power of the attenuator and/or the digital domain baseband signal as described above, and details are not described herein again.
  • the second cell can gradually adjust its transmit power according to the preset step size as described above, and can also adjust its transmit power at a time according to the adjusted value, and details are not described herein.
  • the present invention further provides a cell for implementing the process of the foregoing method. Referring specifically to FIG. 3, the cell includes a BBU and at least one RRU, and each
  • the RRU can further include:
  • the service channel (the service channel 1 shown in the figure), and the service channel corresponds to an external interface (the external interface 1 as shown in the figure), and the service channel communicates with the RRUs of other cells through the external interface.
  • the service channel includes a service sending channel and a service receiving channel.
  • the power adjustment module is connected in series between the service channel and the external interface of any RRU (as shown in the figure, between the service channel 1 and the external interface 1), that is, in at least one RRU, As long as there is a power adjustment module connected between the service channel and the external interface of one RRU, the signals of Embodiments 1 and 2 can be used for signal adjustment, thereby ensuring the normal implementation of the joint correction process.
  • the first switch circuit 301, the second switch circuit 302, and the power adjustment submodule 303 may be included, where the first switch circuit and the second switch circuit are directly connected to form a first a first switch circuit connected to the second switch circuit via the power adjustment sub-module to form a second branch; the first switch circuit is further connected to a service channel, and the second switch circuit It is also connected to an external interface corresponding to the service channel.
  • the transmission or reception of the correction signal can be realized through the second branch; when performing normal business, it can be passed
  • the first branch realizes the transmission or reception of the service signal, because the first branch does not attenuate the signal except for a small line loss, so it does not affect the normal service.
  • the first RRU as the transmitting end must be the new RRU shown in FIG. 3, and the second RRU as the receiving end is not limited, that is, the second RRU can use the old RRU (excluding the power adjustment module).
  • the new RRU can be used without affecting the signal adjustment process of the present invention.
  • the correction signal is adjusted by the power adjustment sub-module after being transmitted through the service transmission channel and then transmitted to the second RRU.
  • the first RRU as the receiving end must be the new RRU shown in FIG. 3, and the second RRU as the transmitting end is not limited, that is, the second RRU can use the old RRU or use the new RRU.
  • the invention signal adjustment process has no effect.
  • the correction signal is received by the service receiving channel after being adjusted by the power adjustment sub-module (the correction signal here specifically refers to the channel correction signal), and then the subsequent joint correction process is performed. Referring to FIG.
  • Step 401 The second cell acquires the power P l 7 of the first cell transmission correction signal, and calculates the isolation m between the second cell and the first cell.
  • a cell that transmits a correction signal is defined as a first cell
  • a cell that receives a correction signal is defined as a second cell.
  • This embodiment is different from Embodiments 1 and 2, and is to be adjusted after the RRU is installed.
  • the signal power can also be understood as determining how to adjust the signal power after the RRU is installed.
  • the communication process between the RRUs of the two cells has not been involved. This is mainly because the power of the correction signal at the second cell can be detected by the second BBU (the power in Embodiments 1 and 2 is obtained by the BBU of the receiving end when the two RRUs communicate), and can also pass The calculation is obtained (that is, the scheme used in Example 3).
  • the preset power of the first RRU transmission correction signal can obviously inform the second BBU in advance, such as manual input or factory default setting.
  • the first method is the loss of the air interface transmission, that is, the isolation m between the two RRUs. This value will not change after the two RRUs are installed, that is, the second BBU can also know the data in advance.
  • the second BBU can calculate the theoretical power value PfPrm of the corrected signal in the second cell according to the above two data, and then combine the reference power P Q expected by the second cell to calculate the corrected signal power from P 2 . Adjust to the adjustment value n of P Q .
  • the correction signal power of the second cell is adjusted from P 2 to P. Regardless of the isolation, it is only necessary to adjust the transmission power of the first RRU from Pi to (Prn) accordingly.
  • the adjustment value n is determined first when the RRU is installed, and when the joint correction is required, the second RRU is sent to the first RRU, so that the first BBU is adjusted according to the adjustment value n.
  • isolation antenna gain of the first RRU - lobe directional gain of the first RRU to the second RRU - lobe directional gain of the second RRU to the first RRU -
  • the air interface environment has basically no scatterer but a direct path, and the space loss can be calculated according to the free space propagation model.
  • the adjustment value is sent to the transmitting end, and the BBU of the transmitting end controls the RRU to perform power adjustment.
  • an adjustment component such as an adjustment switch, an adjustment knob, an adjustment button, a touch screen with an input function, and the like can be disposed outside the transmitting terminal RRU, and the power adjustment process is realized by manually adjusting these adjusting components.
  • it can also be implemented by a cell that transmits a correction signal, and the specific process can be briefly described as follows:
  • the cell that transmits the correction signal is defined as the first cell
  • the cell that receives the correction signal is defined as the second cell.
  • the present invention further provides a signal adjustment apparatus embodiment 1 for adjusting the power of the first cell to transmit a correction signal.
  • the apparatus includes a transmitting unit 501, a receiving unit 502, Control unit 503 and adjustment unit 504;
  • the transmitting unit is configured to send a correction signal to the second cell according to the preset power, so that the second cell determines whether the power of the received correction signal matches the reference power;
  • the receiving unit is configured to receive a determination result returned by the second cell
  • the control unit is configured to: when the determining result received by the receiving unit indicates that the power of the correction signal received by the second cell does not match the reference power, the adjusting unit is configured to adjust the transmitting unit according to the determining result. Transmitting the power of the correction signal to enable the second cell to receive The power of the correction signal corresponds to the reference power.
  • the cell that transmits the correction signal is defined as the first cell
  • the cell that receives the correction signal is defined as the second cell
  • the second cell is finally received from the perspective of adjusting the power of the first cell to transmit the correction signal.
  • the power of the corrected signal is matched to the reference power.
  • the manner in which the control unit controls the adjustment unit to adjust the transmission power is also different, which may be embodied as:
  • control unit is specifically configured to control the adjustment unit to gradually adjust the power of the detection unit to transmit the correction signal according to the preset step according to the power adjustment indication, until The power of the correction signal received by the second cell is matched to the reference power.
  • control unit is specifically configured to control the adjustment unit to adjust, according to the power adjustment indication, the power of the detection unit to transmit the correction signal according to the adjustment value.
  • the transmitting unit in this embodiment may be embodied as a service sending channel of the first RRU, and the receiving unit may be embodied as a service receiving channel of the first RRU, and the control unit may be embodied as the first BBU.
  • the adjustment unit can be embodied as a power adjustment module in the first RRU.
  • the present invention further provides a second embodiment of the signal adjustment apparatus, which is configured to adjust the power of the first cell to receive the correction signal.
  • the apparatus includes a receiving unit 601. a determining unit 602, a control unit 603 and an adjusting unit 604;
  • the receiving unit is configured to receive a correction signal sent by the second cell
  • the determining unit is configured to measure power of the correction signal received by the receiving unit, and determine whether the power matches a reference power
  • the control unit is configured to, when the determining unit determines that the powers do not match, control the adjusting unit to adjust the power of the receiving unit to receive the correction signal, so that the power of the correction signal received by the receiving unit Corresponding to the reference power.
  • the cell that transmits the correction signal is defined as the second cell
  • the cell that receives the correction signal is defined as the first cell
  • the correction received by the first cell is obtained from the perspective of adjusting the power of the received correction signal.
  • the power of the signal is consistent with the reference power.
  • control unit controls the adjustment unit to adjust the received power
  • the control unit is specifically configured to control the adjusting unit to gradually adjust the preset step size.
  • the receiving unit receives the power of the correction signal until the power of the correction signal received by the receiving unit matches the reference power. or,
  • the control unit is specifically configured to calculate a difference between the power of the correction signal received by the receiving unit and the reference power, and control the adjusting unit to adjust, according to the difference, the receiving unit to receive the Correct the power of the signal.
  • the receiving unit in this embodiment may be embodied as a service receiving channel of the first RRU, and both the determining unit and the control unit may be embodied as a first BBU, and the adjusting unit may be embodied as a first RRU.
  • Power adjustment module inside the present invention further provides a signal adjustment apparatus embodiment 3, which is used for adjusting the power of the first cell to transmit a correction signal.
  • the apparatus includes: an obtaining unit 701, Obtaining the power P 1 of the first cell transmission correction signal ;
  • the cell that transmits the correction signal is defined as the first cell
  • the cell that receives the correction signal is defined as the second cell.
  • This embodiment is different from the first embodiment and the second embodiment, and is adjusted after the RRU is installed.
  • the signal power can also be understood as determining how to adjust the signal power after the RRU is installed. At this time, the communication process between the RRUs of the two cells has not been involved.
  • the power of the correction signal at the receiving end is obtained by calculation.
  • the power of the correction signal at the receiving end is obtained by detecting.
  • the adjustment value n is determined first when the RRU is installed, and when the joint correction is required, the second RRU is sent to the first RRU, so that the first BBU is adjusted according to the adjustment value n.
  • Presetting power of the first RRU and controlling the first RRU to transmit a correction signal to the second RRU according to the adjusted power (P r n ) (the correction signal here is embodied as a channel correction signal), thereby ensuring the second RRU
  • the received correction signal meets the requirements of the reference power, and the signal can be directly used for the subsequent joint correction process.
  • the solution corresponding to the foregoing device embodiment 3 can also be implemented by the correction signal transmitting end, that is, a device for adjusting the transmit power of the first cell, the device comprising:
  • An obtaining unit configured to acquire a reference power P 0 of the second cell
  • a calculating unit configured to calculate an isolation m between the first cell and the second cell;
  • a cell that transmits a correction signal is defined as a first cell
  • a cell that receives a correction signal is defined as a second cell.
  • the scheme of the embodiment does not need to notify the transmitting end of the power adjustment situation, that is, the peer end communication is needed, and the transmitter can directly adjust the power to the receiving end when needed.
  • the transmit channel correction signal simplifies the signal modulation process.
  • the embodiment of the present invention further provides a hardware configuration of the signal adjusting device. At least one processor (e.g., a CPU), at least one network interface or other communication interface, a memory, and at least one communication bus can be included for enabling connection communication between the devices.
  • the processor is for executing executable modules stored in the memory, such as a computer program.
  • the memory may include a high speed random access memory (RAM: Random Access Memory), and may also include a non-volatile memory, such as at least one disk storage device.
  • RAM Random Access Memory
  • the communication connection between the system gateway and at least one other network element may be implemented through at least one network interface (which may be wired or wireless), and may use an Internet, a wide area network, a local network, a metropolitan area network, or the like.
  • program instructions are stored in a memory, and the program instructions may be executed by a processor, where the program instructions include a transmitting unit 501, a receiving unit 502, a control unit 503, an adjusting unit 504, and specific Implementation can be seen in the corresponding unit disclosed in FIG.
  • program instructions are stored in a memory, and the program instructions may be executed by a processor, where the program instructions include a receiving unit 601, a determining unit 602, a control unit 603, an adjusting unit 604, and specific Implementation can be seen in the corresponding unit disclosed in FIG. 6.
  • program instructions are stored in a memory, and the program instructions may be executed by a processor.
  • the program instructions include an obtaining unit 701, a calculating unit 702, and an adjusting value unit 703.
  • inventive arrangements may be described in the general context of computer-executable instructions executed by a computer, such as a program element.
  • program units include routines, programs, objects, components, data structures, and the like that perform particular tasks or implement particular abstract data types.
  • inventive arrangements can also be practiced in distributed computing environments where remote locations are connected through a communication network Device to perform tasks.
  • program units can be located in both local and remote computer storage media including storage devices.
  • the various embodiments in the specification are described in a progressive manner, and the same or similar parts between the various embodiments may be referred to each other, and each embodiment focuses on differences from other embodiments.
  • the description is relatively simple, and the relevant portions can be referred to the description of the method embodiment.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, ie may be located One place, or it can be distributed to multiple network elements. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without any creative effort.

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Abstract

本发明提供一种信号调整方法及装置、小区,用于调整第一小区发射校正信号的功率,所述方法包括:所述第一小区按照预设功率向第二小区发射校正信号,以使所述第二小区判断其接收的校正信号的功率是否与基准功率相符;所述第一小区接收所述第二小区返回的判断结果,并根据所述判断结果调整发射所述校正信号的功率,以使所述第二小区接收的校正信号的功率与所述基准功率相符。如此方案,就为小区之间的联合校正过程提供了技术支持,保证多个小区联合校正的正常实现。

Description

一种信号调整方法及装置、 小区
技术领域
本发明涉及通信技术领域, 具体涉及一种信号调整方法及装置、 小区。 背景技术
3G网络中大量使用分布式基站架构, 基站侧可包含基带单元 BBU ( Base Band Unit )和远程射频单元 RRU ( adio Remote Unit ), BBU与 RRU 之间用光纤连接, 一个 BBU可连接多个 RRU, 这种 BBU+RRU的多通道方案 能很好地解决大型建筑物的室内覆盖问题。
根据实际应用的需要, RRU具有两种类型的射频通道: 一种是用于正 常业务通信的射频通道, 称为业务通道, 包括业务发通道和业务收通道; 一种是用于校正业务通道的射频通道, 称为校正通道, 包括校正发通道和 校正收通道。 进一步地, RRU的校正过程又可分为单 RRU自校正和多 RRU 联合校正两种。 其中, 单 RRU自校正是要保证系统小区内任意两个射频通 道的发通道响应和收通道响应的比值相同; 而多 RRU联合校正则是要保证 多个系统小区之间的任意两个射频通道的发通道响应和收通道响应的比值 相同。
在进行多 RRU联合校正时, 针对不同类型的 RRU釆用的方式也有所不 同。 如果校正通道在 RRU外部留有校正接口, 则该类 RRU被称为外校正 RRU, 对此, 可通过线缆连接等方式, 经由校正通道和校正接口与其它 RRU交互校正信号, 实现多 RRU的联合校正。 如果校正通道在 RRU外没有 校正接口, 则该类 RRU被称为内校正 RRU, 对此, 就不能直接经由校正通 道与其它 RRU交互校正信号, 而只能通过业务通道来传递校正信号。 但 是, 与校正通道相比, 业务通道的发通道具有高功放, 收通道具有低噪 放, 因此校正信号在传递过程会经过高功放和低噪放两个处理过程, 致使 联合校正存在以下问题:
对于不同 RRU天线的隔离度小的场景, 可能会出现接收到的校正信号 过大的情况, 使得射频前端饱和; 或者, 在隔离度大的场景中可能会出现 接收到的校正信号过小的情况, 致使信号校正信号被淹没。 也就是说, 内 校正 RRU在进行联合校正时, 对接收到的校正信号的强度要求很高, 信号 过大或者过小都会影响校正信号的正常接收, 最终影响多 RRU联合校正的 实现。 发明内容
本发明实施例的信号调整方法及装置、 小区, 用以通过调整信号功率的 方式保证多远程射频单元联合校正的正常实现。
为此, 本发明实施例提供如下技术方案:
第一方面, 本发明实施例提供了一种信号调整方法, 用于调整第一小区 发射校正信号的功率, 所述方法包括:
所述第一小区按照预设功率向第二小区发射校正信号, 以使所述第二小 区判断其接收的校正信号的功率是否与基准功率相符;
所述第一小区接收所述第二小区返回的判断结果, 并在所述判断结果表 示所述第二小区接收的校正信号的功率与基准功率不相符时,根据所述判断 结果调整发射所述校正信号的功率, 以使所述第二小区接收的校正信号的功 率与所述基准功率相符。
在第一方面的第一种可能的实现方式中,如果所述判断结果包含功率调 整指示, 则所述根据所述判断结果调整发射所述校正信号的功率, 包括: 所述第一小区根据所述功率调整指示按照预设步长逐渐调整发射所述 校正信号的功率, 直至使所述第二小区接收的校正信号的功率与所述基准功 率相符。
在第一方面的第二种可能的实现方式中,如果所述判断结果包含功率调 整指示和调整数值, 则所述根据所述判断结果调整发射所述校正信号的功 率, 包括:
所述第一小区根据所述功率调整指示按照所述调整数值调整发射所述 校正信号的功率。
结合第一方面以及第一方面的第一种或者第二种可能的实现方式, 在第 三种可能的实现方式中, 所述第一小区调整发射所述校正信号的功率的方式 为:
通过衰减器调整发射所述校正信号的功率和 /或通过数字域基带信号调 整发射所述校正信号的功率。
结合第一方面以及第一方面的第一种至第三种任一种可能的实现方式, 在第四种可能的实现方式中, 所述第二小区判断其接收的校正信号的功率是 否与基准功率相符, 包括:
所述第二小区的远程射频单元接收所述校正信号, 并由所述第二小区的 基带单元判断所述校正信号的功率是否与所述基准功率相符。
结合第一方面以及第一方面的第一种至第三种任一种可能的实现方式, 在第五种可能的实现方式中, 所述第一小区接收所述第二小区返回的判断结 果, 并根据所述判断结果调整发射所述校正信号的功率, 包括:
所述第一小区的远程射频单元接收所述判断结果, 并由所述第一小区的 基带单元根据所述判断结果控制所述第一小区的远程射频单元调整发射所 述校正信号的功率。
第二方面, 本发明实施例提供了一种信号调整方法, 用于调整第一小区 接收校正信号的功率, 所述方法包括:
所述第一小区接收第二小区发送的校正信号;
所述第一小区测量接收的所述校正信号的功率, 并判断所述功率是否与 基准功率相符,如果不相符,则调整所述第一小区接收所述校正信号的功率, 使所述第一小区接收到的所述校正信号的功率与所述基准功率相符。
在第二方面的第一种可能的实现方式中, 所述调整所述第一小区接收所 述校正信号的功率, 包括:
所述第一小区按照预设步长逐渐调整其接收所述校正信号的功率, 直至 使所述第一小区接收到的所述校正信号的功率与所述基准功率相符。
在第二方面的第二种可能的实现方式中, 所述调整所述第一小区接收所 述校正信号的功率, 包括:
所述第一小区计算接收的所述校正信号的功率与所述基准功率间的差 值, 并按照所述差值调整所述第一小区接收所述校正信号的功率。
结合第二方面以及第二方面的第一种或者第二种可能的实现方式, 在第 三种可能的实现方式中, 所述调整所述第一小区接收所述校正信号的功率的 方式为:
通过衰减器调整接收所述校正信号的功率。
结合第二方面以及第二方面的第一种至第三种任一种可能的实现方式, 在第四种可能的实现方式中, 所述第一小区测量接收的所述校正信号的功 率, 并判断所述功率是否与基准功率相符, 包括: 所述第一小区的基带单元测量所述第一小区的远程射频单元接收的校 正信号的功率, 并判断所述功率是否与所述基准功率相符。
结合第二方面以及第二方面的第一种至第三种任一种可能的实现方式, 在第五种可能的实现方式中, 所述调整所述第一小区接收所述校正信号的功 率, 包括:
所述第一小区的基带单元控制所述第一小区的远程射频单元调整接收 所述校正信号的功率。
第三方面, 本发明实施例提供了一种信号调整装置, 用于调整第一小区 发射校正信号的功率, 所述装置包括发射单元、 接收单元、 控制单元和调整 单元;
所述发射单元, 用于按照预设功率向第二小区发射校正信号, 以使所述 第二小区判断其接收的校正信号的功率是否与基准功率相符;
所述接收单元, 用于接收所述第二小区返回的判断结果;
所述控制单元, 用于在所述接收单元接收的判断结果表示所述第二小区 接收的校正信号的功率与基准功率不相符时,控制所述调整单元根据所述判 断结果调整所述发射单元发射所述校正信号的功率, 以使所述第二小区接收 的校正信号的功率与所述基准功率相符。
在第三方面的第一种可能的实现方式中,如果所述判断结果包含功率调 整指示, 则
所述控制单元, 具体用于控制所述调整单元根据所述功率调整指示按照 预设步长逐渐调整所述发射单元发射所述校正信号的功率, 直至使所述第二 小区接收的校正信号的功率与所述基准功率相符。
在第三方面的第二种可能的实现方式中,如果所述判断结果包含功率调 整指示和调整数值, 则
所述控制单元, 具体用于控制所述调整单元根据所述功率调整指示按照 所述调整数值调整所述发射单元发射所述校正信号的功率。
第四方面, 本发明实施例提供了一种信号调整装置, 用于调整第一小区 接收校正信号的功率, 所述装置包括接收单元、 判断单元、 控制单元和调整 单元;
所述接收单元, 用于接收第二小区发送的校正信号;
所述判断单元, 用于测量所述接收单元接收的所述校正信号的功率, 并 判断所述功率是否与基准功率相符;
所述控制单元, 用于在所述判断单元判定功率不相符时, 控制所述调整 单元调整所述接收单元接收所述校正信号的功率,使所述接收单元接收到的 所述校正信号的功率与所述基准功率相符。
在第四方面的第一种可能的实现方式中, 所述控制单元, 具体用于控制 所述调整单元按照预设步长逐渐调整所述接收单元接收所述校正信号的功 率, 直至使所述接收单元接收到的所述校正信号的功率与所述基准功率相 付。
在第四方面的第二种可能的实现方式中, 所述控制单元, 具体用于计算 所述接收单元接收的所述校正信号的功率与所述基准功率间的差值, 并控制 所述调整单元按照所述差值调整所述接收单元接收所述校正信号的功率。
第五方面, 本发明实施例提供了一种小区, 所述小区包括一个基带单元 和至少一个远程射频单元, 所述远程射频单元包括业务通道, 所述业务通道 对应有一个能与其它小区通信的外部接口,
所述远程射频单元还包括功率调整模块, 所述功率调整模块串接在任一 远程射频单元的业务通道与外部接口之间;
所述功率调整模块, 用于在所述基带单元的控制下调整所述小区发射校 正信号的功率,或者用于在所述基带单元的控制下调整所述小区接收校正信 号的功率。
在第五方面的第一种可能的实现方式中, 所述功率调整模块包括第一开 关电路、 第二开关电路、 和功率调整子模块;
所述第一开关电路与所述第二开关电路直接相连, 形成第一支路; 所述 第一开关电路经由所述功率调整子模块与所述第二开关电路相连, 形成第二 支路; 所述第一开关电路还与业务通道相连, 所述第二开关电路还与所述业 务通道对应的外部接口相连。
本发明实施的信号调整方法及装置、 小区, 以接收端期望的基准功率为 判断标准, 通过调整发射端 RRU发射校正信号的功率或者调整接收端 RRU 接收校正信号的功率的方式,保证接收端能正常接收到发射端发射的通道校 正信号, 进而正常执行后续的多 RRU联合校正过程。 附图说明 为了更清楚地说明本申请实施例或现有技术中的技术方案, 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍, 显而易见地, 下面 描述中的附图仅仅是本申请中记载的一些实施例,对于本领域普通技术人员 来讲, 还可以根据这些附图获得其它的附图。
图 1是本发明信号调整方法实施例 1的流程图;
图 2是本发明信号调整方法实施例 2的流程图;
图 3是本发明远程射频单元的构成示意图;
图 4是本发明信号调整方法实施例 3的流程图;
图 5是本发明信号调整装置实施例 1的示意图;
图 6是本发明信号调整装置实施例 2的示意图;
图 7是本发明信号调整装置实施例 3的示意图;
图 8是本发明信号调整装置实施例 1的硬件构成示意图;
图 9是本发明信号调整装置实施例 2的硬件构成示意图;
图 10是本发明信号调整装置实施例 3的硬件构成示意图。 具体实施方式
为了使本技术领域的人员更好地理解本发明方案, 下面结合附图和实施 方式对本发明实施例作进一步的详细说明。
下面先对本发明技术方案的具体应用场景进行简单介绍。
在时分双工 TDD ( Time Division Duplex )系统中, 为了知晓下行信道情 况, 基站可通过检测用户设备发送的探测参考信号 SRS ( Sounding eference Signal ) 的方式先对上行信道进行估计, 然后再利用 TDD系统上下行的互易 性, 将估计出的上行信道作为下行信道进行波束赋形。 虽然理论上 TDD系 统上下行是互易的, 但在实际应用中上下行信道分别引入了基站不同的射 频通道, 且这些射频通道的响应是不同的, 而如果任意两个射频通道的发 通道响应与收通道响应的比值不同, 就会影响最终的发射效果, 因此, 需 要对各个射频通道进行补偿, 即要进行通道校正。
协作多点传输 CoMP ( Coordinated Multi-Point )是长期演进 LTE ( Long Term Evolution )系统的一个关键特性, LTE系统的基站侧可包括至少一个基 站小区, 每个基站小区具有一个基带单元 BBU ( Base Band Unit ) , 以及该 BBU连接的多个远程射频单元 RRU ( adio Remote Unit )。 联合发送 JT ( Joint Transmission )技术作为 CoMP技术的一种, 可以显著提高小区边缘用户的服 务质量和平均吞吐量。 为了在 TDD系统中实现 JT技术带来的增益, 同样需 要进行通道校正, 且与单小区波束赋形技术不同的是, JT技术需要多个小 区的各个天线对应的发送接收射频通道响应的比值均相同。 即使各个小区 分别进行了通道校正, 如果没有进行小区间的校正, JT技术仍然不能到达 期望的性能, 也即需要进行多 RRU联合校正。
在进行多 RRU联合校正时, 校正信号会在任意两个 RRU之间传递, 对 于没有校正接口的内校正 RRU来说, 校正信号被发射时要被发射端 RRU的 业务通道进行高功放, 被接收时要被接收端 RRU的业务通道进行低噪放, 为了保证后续联合校正过程的可靠实现, 就要求校正信号经高功放和低噪 放之后的功率必须符合接收端 RRU的期望, 也即必须符合基准功率, 否则 将无法实现后续的联合校正过程。
本发明的信号调整方法就是为解决上述问题而提出, 下面对本发明技 术方案的具体实现进行解释说明。 参见图 1, 示出了本发明信号调整方法实施例 1的流程图, 该方法主要 是从校正信号发射端来讲, 如何实现信号调整过程, 也就是说, 该方法主要 用于调整第一小区发射校正信号的功率, 所述方法包括:
步骤 101, 所述第一小区按照预设功率向第二小区发射校正信号, 以使 所述第二小区判断其接收的校正信号的功率是否与基准功率相符。
由上文介绍可知, 在进行多 RRU联合校正时, 校正信号要在两个小区 之间传递, 此处可将发射校正信号的小区定义为第一小区, 将接收校正信号 的小区定义为第二小区, 本实施例是从调整第一小区发射校正信号的功率的 角度出发, 最终使第二小区接收到的校正信号的功率与基准功率相符, 以便 实现后续的联合校正过程。
进一步地,我们还可做如下定义: 第一小区中具体执行发射动作的 RRU 定义为第一 RRU, 与之相连的 BBU定义为第一 BBU; 第二小区中具体执行 接收动作的 RRU定义为第二 RRU, 与之相连的 BBU定义为第二 BBU, 则 本步骤的具体执行过程为:
在有校正需要时, 第一 BBU控制第一 RRU按照预设功率向第二 RRU 发射校正信号, 则校正信号经由第一 RRU对应的天线辐射出去, 经过空口 传输最终被第二 RRU的天线接收, 进而由第二 BBU明确第二 RRU接收到 的校正信号的功率, 并与期望的基准功率相比较, 如果二者相符, 则认为第 二小区能利用这种功率的信号进行联合校正, 无需调整第一 RRU的发射功 率; 如果二者不相符, 则认为第二小区不能利用这种功率的信号进行联合校 正, 需要调整第一 RRU的发射功率, 此时第二 BBU就会控制第二 RRU向 第一 RRU反馈表示需要进行信号调整的判断结果,以此来调整第一 RRU的 发射功率。
下面通过一个示例进一步对本步骤进行解释说明。 假设, 第一 RRU发 射校正信号的预设功率为 40dB, 空口传输过程中信号损耗为 70dB (空口损 耗也即两个 RRU间的隔离度, 在两个 RRU安装完成后, 空口损耗基本不会 变), 则理论上第二 RRU接收到的校正信号的功率为 -30dB, 若基准功率为 -60dB, 则第二 RRU接收到的校正信号的功率与基准功率相比相差 -30dB, 明显不相符,故第二 RRU会向第一 RRU返回表示功率不相符的判断结果信 号。
需要说明的是, 本发明中的相符可以理解为, 第二 RRU接收到的校正 信号功率处于由基准功率确定的一个阔值区间内即可, 而不一定是与基准功 率严格相等。 当然, 在一些精度要求较高的情况时, 也可规定只有校正信号 功率与基准功率相等才做出功率相符的判断结果, 本发明对此不做限定。
步骤 102, 所述第一小区接收所述第二小区返回的判断结果, 并在所述 判断结果表示所述第二小区接收的校正信号的功率与基准功率不相符时,根 据所述判断结果调整发射所述校正信号的功率, 以使所述第二小区接收的校 正信号的功率与所述基准功率相符。
第一 RRU将第二 RRU反馈的判断结果转送给第一 BBU, 如果判断结 果表示功率不相符,第一 BBU则会根据判断结果调整第一 RRU发射校正信 号的功率, 并最终使第二小区接收的校正信号的功率与基准功率相符。
对于第一 BBU根据判断结果调整第一 RRU发射功率的方式,此处暂不 详述。
需要说明的是, 第二 RRU反馈的判断结果可以有以下两种理解: 一种是,无论功率是否相符,第二 RRU都会向第一 RRU反馈判断结果, 相应地, 第一 BBU在接收到这种判断结果后, 就要先识别下判断结果表示 的是功率相符还是不相符, 也即判断下是否要调整第一 RRU发射校正信号 的功率, 然后再进行后续处理。
一种是, 只有在功率不相符的情况下, 第二 RRU才会向第一 RRU反馈 判断结果, 也就是说, 第一 BBU只要接收到这种判断结果, 就可直接启动 调整第一 RRU发射功率的过程。
本发明对第二 RRU反馈判断结果的方式不做限定, 只要在需要调整功 率时能准确控制第一小区启动调整发射功率的过程即可。
另外, 需要说明的是, 本实施例中的校正信号可以理解为是用于校正信 号功率的信号, 也即是一般意义上的任一参考信号, 也可以理解为是用于进 行联合校正的通道校正信号, 但是, 不论是哪种具体信号均可实现本实施例 调整信号功率的目的, 所不同的是,
如果是任一参考信号, 则在确定好符合第二小区期望的发射功率后, 第 一 BBU还要控制第一 RRU以确定好的发射功率向第二 RRU发射一次用于 联合校正的通道校正信号。 也就是说, 在第二 BBU判定功率相符后, 要控 制第二 RRU向第一 RRU反馈一个信号,以使第一 RRU启动联合校正过程, 按照确定好的功率向第二 RRU发射通道校正信号。
如果是通道校正信号, 则在第二 BBU判定功率相符后, 可直接利用该 符合期望的信号进行后续的联合校正过程, 而不用再通知第一 RRU, 可在 一定程度上简化信号调整过程。 此外, 由于参考信号与通道校正信号还是存 在一定差异的,故直接釆用用于后续联合校正过程的通道校正信号进行信号 调整, 就能保证确定的功率调整量的真实性和准确性。
本发明的信号调整方法,接收校正信号的第二小区判断第一小区发射的 校正信号是否符合其使用要求, 并将判断结果反馈给第一小区, 控制第一小 区在需要时及时准确的调整其发射功率, 以此来保证联合校正时, 第二小区 可以准确接收并识别第一小区发射的通道校正信号, 进而完成多 RRU联合 校正过程。
需要说明的是, 如果外校正 RRU不利用校正端口进行联合校正, 而是 利用业务天线(即通过业务通道)进行联合校正, 则同样可釆用本发明方案 来保证多个外校正 RRU间的联合校正过程的正常实现。 下面对本实施例中步骤 102根据判断结果调整第一 RRU发射功率的方 式进行解释说明。 根据判断结果包含的内容的不同, 本发明提供如下两种调整发射功率的 方式。
方式一, 如果所述判断结果包含功率调整指示, 则可根据功率调整指示 按照预设步长逐渐调整第一 RRU的发射功率, 直至使第二小区接收的校正 信号的功率与基准功率相符,也即釆用逐步递进的方式调整发射功率。其中, 功率调整指示可具体体现为功率上调指示或者功率下调指示两种。
假设预设的调整步长为 10dB, 仍以上述相差 -30dB的示例为例, 具体调 整过程为:
( 1 )第二 BBU控制第二 RRU向第一 RRU反馈包含功率下调指示的判 断结果,第一 RRU接收到该判断结果后即转送到第一 BBU识另 'j,第一 BBU 首先明确其当前需要调整第一 RRU的发射功率,其次控制第一 RRU在下调 指示是作用下按照预设步长调整其预设发射功率,经一次调整后,第一 RRU 的发射功率为 40dB-10dB=30dB。
( 2 )第一 BBU控制第一 RRU按照调整后的功率 30dB发射校正信号, 则校正信号经空口传输并被第二 RRU接收后的功率为 30dB-70dB=-40dB, 与基准功率 -60dB相比仍存在 -20dB的差值, 故第二 BBU会控制第二 RRU 继续向第一 RRU反馈包含功率下调指示的判断结果。
( 3 )第一 RRU接收到判断结果之后, 继续在第一 BBU的控制下按照 10dB的步长下调其发射功率,并以第二次下调后的功率 20dB发射校正信号, 供第二 BBU判断。 在本示例中, 第二 BBU判断之后仍认为第二 RRU接收 的校正信号的功率不符合期望,故还会控制第二 RRU继续向第一 RRU反馈 包含功率下调指示的判断结果,如此往复直至第二 BBU判断第二 RRU接收 的校正信号的功率与基准功率相符为止。
在本示例中, 只要控制第一 RRU调整 3次即可满足第二小区的要求。 ( 4 )在第三次调整过程中, 将第一 RRU的发射功率调整为 10dB, 则 经空口传输损耗的 70dB后, 校正信号被第二 RRU接收时的功率为 -60dB, 与基准功率相等, 至此也就结束了本发明的信号调整过程。 在进行联合校正 时, 第一 RRU就可以 10dB的功率向第二 RRU发射通道校正信号。
需要说明的是, 在釆用本方式调整信号功率时, 如果对信号调整速度要 求较高, 则可将调整步长设置的稍大些; 如果对信号调整精度要求较高, 则 可将调整步长设置的稍小些, 用户可根据实际使用情况灵活设置调整步长, 本发明对此不做限定。
方式二, 如果所述判断结果包含功率调整指示和调整数值, 则可根据功 率调整指示按照调整数值调整第一 RRU发射校正信号的功率。 其中, 功率 调整指示可具体体现为功率上调指示或者功率下调指示两种,调整数值由第 二 BBU计算获得。
仍以上述相差 -30dB的示例为例, 具体调整过程为:
( 1 )第一 RRU按照 40dB的预设功率向第二 RRU发射校正信号,则经 空口传输损耗的 70dB, 校正信号被第二 RRU接收时的功率为 -30dB, 显然 与基准功率不符, 且相差的差值为 -60dB- ( -30dB ) =-30dB, 第二 BBU就会 将判断结果中的功率调整指示设置为功率下调指示, 将调整数值设置为 30dB, 然后通过第二 RRU反馈给第一 RRU。
( 2 )第一 RRU接收到判断结果之后即转送到第一 BBU识别, 同样地, 第一 BBU首先明确其当前需要调整第一 RRU的发射功率, 其次控制第一 RRU 在按照下调指示将预设功率减小 30dB, 并按减小后的功率 40dB-30dB=10dB发射校正信号, 这样就可使第二小区接收到的校正信号的 功率等于其期望的基准功率, 至此也就结束了本发明的信号调整过程。 同样 的, 在进行联合校正时, 第一 RRU就可以 1 OdB的功率向第二 RRU发射通 道校正信号。 可能会出现要上调发射功率的情况,在实现方式上其与下调发射功率的方式 相同, 只不过是将功率调整指示设置为功率上调指示即可, 此处不再赘述。 需要说明的是, 第一 BBU调整第一 RRU发射功率的方式可体现为: 通 过调整衰减器的方式来调整第一 RRU发射校正信号的功率, 和 /或通过调整 数字域基带信号功率的方式来调整第一 RRU发射校正信号的功率。 数字域 的调整范围较小, 大概 10~20dB, 且要保证该方式降低发射功率的同时不能 出现信号畸变现象, 也就是说, 要在保证信号精度的情况下调整发射功率。 相对来说, 衰减器的调整范围不仅大还很灵活, 可优选利用衰减器来调整发 射功率。 亦或者还可综合两种方式调整功率, 例如, 数字域的调整范围为 15dB, 衰减器的调整范围为 60dB, 第二 RRU反馈给第一 RRU的调整数值 为 -75dB, 故可通过下调数字域和衰减器的方式实现。 参见图 2, 示出了本发明信号调整方法实施例 2的流程图, 该方法主要 是从校正信号接收端来讲, 如何实现信号调整过程, 也就是说, 该方法主要 用于调整第一小区接收校正信号的功率, 所述方法包括:
步骤 201, 所述第一小区接收第二小区发送的校正信号。
步骤 202, 所述第一小区测量接收的所述校正信号的功率, 并判断所述 功率是否与基准功率相符, 如果不相符, 则调整所述第一小区接收所述校正 信号的功率,使所述第一小区接收到的所述校正信号的功率与所述基准功率 相符。
与图 1所示的方法实施例 1相类似, 本实施例在实现时校正信号也需要 在两个小区之间传递, 只不过此处将接收校正信号的小区定义为第一小区, 将发射校正信号的小区定义为第二小区, 本实施例是从调整接收校正信号的 功率的角度出发, 最终使第一小区接收到的校正信号的功率与基准功率相 付。
同样地,我们还需要做如下定义: 第一小区中具体执行接收动作的 RRU 定义为第一 RRU, 与之相连的 BBU定义为第一 BBU; 第二小区中具体执行 发射动作的 RRU定义为第二 RRU, 与之相连的 BBU定义为第二 BBU, 则 本步骤的具体执行过程为:
在有校正需要时, 第二 BBU控制第二 RRU按照预设功率向第一 RRU 发射校正信号, 则校正信号经由第二 RRU对应的天线辐射出去, 经过空口 传输最终被第一 RRU的天线接收, 进而由第一 BBU明确第一 RRU接收到 的校正信号的功率, 并与期望的基准功率相比较, 如果二者相符, 则认为第 一小区能利用这种功率的信号进行联合校正, 无需调整第一 RRU的接收功 率; 如果二者不相符, 则认为第一小区不能利用这种功率的信号进行联合校 正, 需要调整第一 RRU的接收功率。
下面通过一个示例进一步对本步骤进行解释说明。 假设, 第二 RRU发 射校正信号的预设功率为 40dB, 空口传输过程中信号损耗为 70dB (空口损 耗也即两个 RRU间的隔离度, 在两个 RRU安装完成后, 空口损耗基本不会 变), 则理论上第一 RRU接收到的校正信号的功率为 -30dB, 若基准功率为 -60dB, 则第一 RRU接收到的校正信号的功率与基准功率相比相差 -30dB, 明显不相符, 故需要调整第一 RRU接收校正信号的功率。 在本实施例中,接收端的第一 RRU无需向发射端的第二 RRU反馈判断 结果, 在第一 BBU判定需要调整功率后, 由接收端完成调整过程, 且调整 的是第一 RRU接收校正信号的功率。
具体地, 本实施的信号调制方法是要在本次接收发送过程中明确是否需 要调整接收功率, 具体调整过程则是在下次接收发送过程中实现的。 也就是 说, 在第二 RRU下次向第一 RRU发射校正信号时, 第一 RRU要先利用上 次的判断结果调整其接收功率,然后再将接收到的校正信号转送到第一 BBU 进行功率是否相符的判断。
需要说明的是, 本实施例中的校正信号优选指的是用于进行联合校正的 通道校正信号, 这样在第一 RRU将其调整至与基准功率相符后, 就可直接 利用该信号进行后续的联合校正过程, 可最大程度的简化信号调整过程。
当然, 作为本实施例的一种实现方式, 校正信号也可以是一般意义上的 任一参考信号。 如果校正信号为参考信号, 则在第一 RRU确定好符合其期 望的接收功率后, 还要通知第二 RRU继续向其发射通道校正信号, 相应地, 第一 RRU要在接收到通道校正信号之后, 用确定好的功率接收所述通道校 正信号, 并转送到第一 BBU, 利用通道校正信号进行后续的联合校正过程。 下面对本实施例中步骤 202调整接收信号功率的方式进行解释说明。 与实施例 1调整功率的方式相同, 第一 RRU也可通过两种方式调整接 收的校正信号的功率。
方式一,第一 BBU控制第一 RRU按照预设步长逐渐调整其接收校正信 号的功率, 直至使接收到的校正信号的功率与基准功率相符, 也即釆用逐步 递进的方式调整功率, 可具体体现为上调功率或者下调功率两种。
若预设的调整步长为 10dB, 仍以上述相差 -30dB的示例为例, 具体调整 过程为:
在第二 RRU向第一 RRU第一次发射校正信号之后, 第一 BBU经比较 可知第一 RRU当前接收到的校正信号的功率大于基准功率, 需下调减小第 一 RRU的接收功率, 故在第二 RRU向第一 RRU第二次发射校正信号时, 开始尝试进行第一次调整, 将接收功率下调到 -30dB-10dB=-40dB, 并将该功 率下接收到的校正信号转送到第一 BBU, 继续与基准功率 -60dB相比较, 发 现仍需继续下调, 故在第二 RRU向第一 RRU第三次发射校正信号时, 开始 尝试进行第二次调整, 将接收功率下调到 -40dB-10dB=-50dB, 如此往复直至 第一 BBU判定接收到的校正信号的功率与基准功率相符为止。在本示例中, 第一 RRU尝试调整 3次即可满足后续联合校正的使用要求。
方式二,第一 BBU计算第一 RRU接收的校正信号的功率与基准功率间 的差值, 并控制第一 RRU按照所述差值调整其接收功率。
仍以上述相差 -30dB的示例为例, 第一 BBU检测第一 RRU接收的校正 信号的功率为 -30dB, 判定该功率与基准功率不相符, 并计算二者的差值为 -60dB- ( -30dB ) =-30dB, 在这种情况下, 第一 BBU要控制第一 RRU—次 性将接收功率下调 30dB, 才能使第一 RRU接收的校正信号的功率与基准功 率相符, 才能利用这种功率的信号进行后续的联合校正过程。
上述示例中均是以下调接收功率为例进行的解释说明,在实际应用中也 可能会出现要上调接收功率的情况, 在实现方式上其与下调功率的方式相 同, 此处不再赘述。
具体地,第一 BBU可通过调整衰减器的方式来调整第一 RRU接收校正 信号的功率; 或者还可通过第一小区和第二小区相配合的方式来调整第一 RRU接收校正信号的功率。 仍以上述需要调 -75dB的示例为例, 如果第一小 区的衰减器的调整范围是 60dB, 则只单纯的调整第一小区的衰减器并不能 使接收的校正信号功率与基准功率相符, 故在这种情况下, 第一小区还应通 知第二小区调整其发射校正信号的功率, 以此来配合第一小区。 需要说明的 是,第二小区可如上文介绍通过调整衰减器和 /或数字域基带信号功率的方式 来调整其发射功率, 此处不再赘述。 且第二小区可如上文介绍按预设步长逐 渐调整其发射功率, 也可根据调整数值一次性调整其发射功率, 此处亦不再 做赘述。 对应上述方法实施例 1和 2, 本发明还提供一种用于实现上述方法过程 的小区, 具体可参见图 3, 所述小区包括一个 BBU和至少一个 RRU, 每个
RRU又可进一步包括:
业务通道(如图中所示的业务通道 1 ),且业务通道对应有一外部接口(如 图中所示的外部接口 1 ), 所述业务通道通过所述外部接口与其它小区的 RRU通信。 进一步地, 业务通道都包括一个业务发通道和一个业务收通道, 当 RRU作为发射端时, 可通过业务发通道发射校正信号, 当 RRU作为接收 端时, 可通过业务收通道接收校正信号。
功率调整模块, 功率调整模块串接在任一 RRU的业务通道与外部接口 之间 (如图中所示串接在业务通道 1与外部接口 1之间), 也就是说, 在至 少一个 RRU中,只要有一个 RRU的业务通道与外部接口之间串接了功率调 整模块就可利用实施例 1、 2的方案进行信号调整, 进而保证联合校正过程 的正常实现。
作为功率调整模块的一种实现方式, 可包括第一开关电路 301、 第二开 关电路 302、 功率调整子模块 303, 其中, 所述第一开关电路与所述第二开 关电路直接相连, 形成第一支路; 所述第一开关电路经由所述功率调整子模 块与所述第二开关电路相连, 形成第二支路; 所述第一开关电路还与业务通 道相连, 所述第二开关电路还与所述业务通道对应的外部接口相连。
这样, 在进行通道校正(本发明的信号调整过程可视为是通道校正的一 个前提基础)时, 就可通过第二支路实现校正信号的发射或接收; 在进行正 常业务时, 就可通过第一支路实现业务信号的发射或接收, 因为第一支路除 了有很小的线路损耗之外, 其没有对信号进行衰减, 故不会对正常业务产生 影响。
下面结合图 3所示示意图, 对本发明实施例 1、 2的实现过程进行简单 描述。
对于实施例 1来说,作为发射端的第一 RRU必须是图 3所示的新 RRU, 作为接收端的第二 RRU可不做限定, 即第二 RRU可釆用旧 RRU (不包含 功率调整模块)也可釆用新 RRU, 对本发明信号调整过程无影响。 在需要 进行信号调整时,校正信号经由业务发通道后要被功率调整子模块调整后再 发射给第二 RRU。
对于实施例 2来说,作为接收端的第一 RRU必须是图 3所示的新 RRU, 作为发射端的第二 RRU可不做限定, 即第二 RRU可釆用旧 RRU也可釆用 新 RRU, 对本发明信号调整过程无影响。 在需要进行信号调整时, 校正信 号经功率调整子模块调整后会被业务收通道所接收(此处的校正信号具体指 通道校正信号), 进而进行后续的联合校正过程。 参见图 4, 示出了本发明信号调整方法实施例 3的流程图, 用于调整第 一小区发射校正信号的功率, 所述方法包括: 步骤 401, 第二小区获取所述第一小区发射校正信号的功率 Pl 7 并计算 所述第二小区与所述第一小区间的隔离度 m。
步骤 402, 所述第二小区根据基准功率 P。计算调整数值 n, 并利用所述 调整数值控制所述第一小区调整发射所述校正信号的功率; 其中, n= P0- ( P m )0
在本实施例中, 将发射校正信号的小区定义为第一小区, 将接收校正信 号的小区定义为第二小区, 本实施例与实施例 1、 2有所不同, 要在 RRU安 装之后即调整信号功率, 或者也可以理解为是在 RRU安装之后先确定出如 何调整信号功率, 此时还未涉及两个小区的 RRU间的通信过程。 这主要是 因为, 校正信号在第二小区处的功率可通过第二 BBU检测得到 (实施例 1、 2中的功率即是在两个 RRU通信时由接收端的 BBU检测获得的), 也可通 过计算获得(也即实施例 3所釆用的方案)。
在通过计算获得第二小区接收校正信号的功率的过程中会涉及两个数 据: 一是第一 RRU发射校正信号的预设功率 其显然可预先告知第二 BBU, 例如人工输入或者出厂设置默认值等方式; 一是空口传输的损耗即两 个 RRU间的隔离度 m, 这一数值在两个 RRU安装后就基本不会改变, 也即 第二 BBU也可提前获知该数据。 这样, 第二 BBU就可根据上述两个数据计 算获得校正信号在第二小区的理论功率值 PfPrm, 然后再结合第二小区期 望的基准功率 PQ, 就可计算出将校正信号功率从 P2调整至 PQ的调整数值 n。 因为两个 RRU间的隔离度不会随着发射功率的变化而变化, 故若要使第二 小区的校正信号功率从 P2调整到 P。, 无需考虑隔离度, 只要使第一 RRU的 发射功率相应地从 Pi调整至(Prn ) 即可。
釆用本实施例方案, 即是在 RRU安装时先确定好调整数值 n,并在需要 进行联合校正时, 通过第二 RRU将其发送给第一 RRU, 进而使第一 BBU 按照调整数值 n调整第一 RRU的预设功率 并控制第一 RRU按调整后的 功率(Prn ) 向第二 RRU发射通道校正信号, 这样就能保证第二 RRU接收 的通道校正信号符合基准功率的要求, 可直接利用该信号进行后续的联合校 正过程。
两个 RRU间的隔离度公式为,隔离度= -第一 RRU的天线增益-第一 RRU 到第二 RRU的波瓣方向性增益 -第二 RRU到第一 RRU的波瓣方向性增益- 第二 RRU的天线增益 +第一 RRU天线与第二 RRU天线之间的空间损耗。其 中, 天线增益是固定的; 波瓣方向性增益需要现场测量水平面和垂直面的波 束方向角, 再根据该款天线的波束方向图查出对应的方向性增益; 另外, 考 虑到 RRU之间的空口环境基本没有散射体而是直射径, 空间损耗可以根据 自由空间传播模型计算。
需要说明的是, 对应这种安装之后先确定如何调整信号功率的方案来 说, 除了上述我们说明的, 在需要调整功率时, 将调整数值发送到发射端, 由发射端的 BBU控制 RRU进行功率调整之外, 还可在发射端 RRU外部设 置一个调整部件, 如调整开关、 调整旋钮、 调整按键、 带输入功能的触摸屏 等, 通过手动调节这些调整部件的方式实现功率调整过程。 此外, 相应于图 4所示的方案, 还可由发射校正信号的小区实现, 具体 过程可简述如下:
首先, 将发射校正信号的小区定义为第一小区, 将接收校正信号的小区 定义为第二小区; 其次, 第一小区中的第一 BBU要知晓以下三个数据: 第 一 RRU的发射功率 隔离度 m、 第二小区的基准功率 P。, 并利用这三个 数据计算获得调整数值 n= ( Po+m ) -P! , 其中, (P。+m )表示在第二小区接 收的校正信号符合基准功率时对应的第一 RRU的发射功率, 以该值为依据 调整 Pi, 最终使第二小区接收到符合其期望的校正信号。 本方案与实施例 3 相比, 在需要联合校正时, 无需接收端告知发射端功率调整情况, 也即无需 对端通信即可在需要时直接由发射端按照调整好的功率向接收端发射通道 校正信号, 简化了信号调制过程。 与方法实施例 1相对应的, 本发明还提供一种信号调整装置实施例 1, 用于调整第一小区发射校正信号的功率, 参见图 5, 所述装置包括发射单元 501、 接收单元 502、 控制单元 503和调整单元 504;
所述发射单元, 用于按照预设功率向第二小区发射校正信号, 以使所述 第二小区判断其接收的校正信号的功率是否与基准功率相符;
所述接收单元, 用于接收所述第二小区返回的判断结果;
所述控制单元, 用于在所述接收单元接收的判断结果表示所述第二小区 接收的校正信号的功率与基准功率不相符时,控制所述调整单元根据所述判 断结果调整所述发射单元发射所述校正信号的功率, 以使所述第二小区接收 的校正信号的功率与所述基准功率相符。
在本实施例中, 将发射校正信号的小区定义为第一小区, 将接收校正信 号的小区定义为第二小区, 从调整第一小区发射校正信号的功率的角度出 发, 最终使第二小区接收到的校正信号的功率与基准功率相符。
具体地, 根据第二小区返回的判断结果包含的内容的不同, 控制单元控 制调整单元调整发射功率的方式也有所不同, 可体现为:
如果所述判断结果包含功率调整指示, 则所述控制单元, 具体用于控制 所述调整单元根据所述功率调整指示按照预设步长逐渐调整所述发射单元 发射所述校正信号的功率, 直至使所述第二小区接收的校正信号的功率与所 述基准功率相符。 或者,
如果所述判断结果包含功率调整指示和调整数值, 则所述控制单元, 具 体用于控制所述调整单元根据所述功率调整指示按照所述调整数值调整所 述发射单元发射所述校正信号的功率。
结合上文对方法实施例的介绍可知, 本实施例中的发射单元可体现为第 一 RRU的业务发通道,接收单元可体现为第一 RRU的业务收通道, 控制单 元可体现为第一 BBU, 调整单元可体现为第一 RRU内的功率调整模块。 与方法实施例 2相对应的, 本发明还提供一种信号调整装置实施例 2, 用于调整所述第一小区接收校正信号的功率, 如图 6所示, 所述装置包括接 收单元 601、 判断单元 602、 控制单元 603和调整单元 604;
所述接收单元, 用于接收第二小区发送的校正信号;
所述判断单元, 用于测量所述接收单元接收的所述校正信号的功率, 并 判断所述功率是否与基准功率相符;
所述控制单元, 用于在所述判断单元判定功率不相符时, 控制所述调整 单元调整所述接收单元接收所述校正信号的功率,使所述接收单元接收到的 所述校正信号的功率与所述基准功率相符。
在本实施例中, 将发射校正信号的小区定义为第二小区, 将接收校正信 号的小区定义为第一小区, 从调整接收校正信号的功率的角度出发, 最终使 第一小区接收到的校正信号的功率与基准功率相符。
具体地, 控制单元控制调整单元调整接收功率的方式可体现以下两种: 所述控制单元, 具体用于控制所述调整单元按照预设步长逐渐调整所述 接收单元接收所述校正信号的功率, 直至使所述接收单元接收到的所述校正 信号的功率与所述基准功率相符。 或者,
所述控制单元, 具体用于计算所述接收单元接收的所述校正信号的功率 与所述基准功率间的差值, 并控制所述调整单元按照所述差值调整所述接收 单元接收所述校正信号的功率。
结合上文对方法实施例的介绍可知, 本实施例中的接收单元可体现为第 一 RRU的业务收通道, 判断单元和控制单元都可体现为第一 BBU, 调整单 元可体现为第一 RRU内的功率调整模块。 与方法实施例 3相对应的, 本发明还提供一种信号调整装置实施例 3, 用于调整第一小区发射校正信号的功率, 如图 7所示, 所述装置包括: 获取单元 701, 用于获取所述第一小区发射校正信号的功率 P1 ;
计算单元 702, 用于计算所述第二小区与所述第一小区间的隔离度 m; 调整值单元 703, 用于根据基准功率 P。计算调整数值 n, 并利用所述调 整数值控制所述第一小区调整发射所述校正信号的功率, n= P(r ( Prm )。
在本实施例中, 将发射校正信号的小区定义为第一小区, 将接收校正信 号的小区定义为第二小区, 本实施例与实施例 1、 2有所不同, 是在 RRU安 装之后即调整信号功率, 或者也可以理解为是在 RRU安装之后先确定出如 何调整信号功率, 此时还未涉及两个小区的 RRU间的通信过程。 且本实施 例方案中通过计算获得校正信号在接收端的功率, 实施例 1、 2 中则是通过 检测获得校正信号在接收端的功率。
釆用本实施例方案, 即是在 RRU安装时先确定好调整数值 n,并在需要 进行联合校正时, 通过第二 RRU将其发送给第一 RRU, 进而使第一 BBU 按照调整数值 n调整第一 RRU的预设功率 并控制第一 RRU按调整后的 功率( Prn )向第二 RRU发射校正信号(此处的校正信号具体体现为通道校 正信号), 这样就能保证第二 RRU接收的校正信号符合基准功率的要求, 可 直接利用该信号进行后续的联合校正过程。
同样地, 相应于上述装置实施例 3的方案, 还可由校正信号发射端来实 现, 也即提供一种用于调整第一小区发射功率的装置, 该装置包括:
获取单元, 用于获取所述第二小区的基准功率 P0;
计算单元, 用于计算所述第一小区与所述第二小区间的隔离度 m; 调整值单元, 用于根据所述第一小区的发射功率 Pi计算调整数值 n, 并 利用所述调整数值控制所述第一小区调整发射所述校正信号的功率, n= ( Po+m ) -Pl o
在本实施例中, 将发射校正信号的小区定义为第一小区, 将接收校正信 号的小区定义为第二小区。 与实施例 3相比, 本实施例方案在需要联合校正 时, 无需接收端告知发射端功率调整情况, 也即无需对端通信即可在需要时 直接由发射端按照调整好的功率向接收端发射通道校正信号, 简化了信号调 制过程。 进一步地, 本发明实施例还分别提供了信号调整装置的硬件构成。 可包 括至少一个处理器(例如 CPU ), 至少一个网络接口或者其它通信接口, 存 储器, 和至少一个通信总线, 用于实现这些装置之间的连接通信。 处理器用 于执行存储器中存储的可执行模块, 例如计算机程序。 存储器可能包含高速 随机存取存储器(RAM: Random Access Memory ), 也可能还包括非不稳定 的存 4诸器( non- volatile memory ), 例如至少一个磁盘存 4诸器。 通过至少一个 网络接口 (可以是有线或者无线)实现该系统网关与至少一个其它网元之间 的通信连接, 可以使用互联网, 广域网, 本地网, 城域网等。
参见图 8, 在一些实施方式中, 存储器中存储了程序指令, 程序指令可 以被处理器执行, 其中, 程序指令包括发射单元 501、 接收单元 502、 控制 单元 503、 调整单元 504, 各单元的具体实现可参见图 5所揭示的相应单元。
参见图 9, 在一些实施方式中, 存储器中存储了程序指令, 程序指令可 以被处理器执行, 其中, 程序指令包括接收单元 601、 判断单元 602、 控制 单元 603、 调整单元 604, 各单元的具体实现可参见图 6所揭示的相应单元。
参见图 10, 在一些实施方式中, 存储器中存储了程序指令, 程序指令可 以被处理器执行, 其中, 程序指令包括获取单元 701、 计算单元 702、 调整 值单元 703, 各单元的具体实现可参见图 7所揭示的相应单元。
本发明方案可以在由计算机执行的计算机可执行指令的一 般上下文中描述, 例如程序单元。 一般地, 程序单元包括执行 特定任务或实现特定抽象数据类型的例程、 程序、 对象、 组件、 数据结构等等。 也可以在分布式计算环境中实践本发明方案, 在这些分布式计算环境中, 由通过通信网络而被连接的远程处 理设备来执行任务。 在分布式计算环境中, 程序单元可以位于 包括存储设备在内的本地和远程计算机存储介质中。
本说明书中的各个实施例均釆用递进的方式描述, 各个实 施例之间相同相似的部分互相参见即可, 每个实施例重点说明 的都是与其它实施例的不同之处。 尤其, 对于装置实施例而言, 由于其基本相似于方法实施例, 所以描述得比较简单, 相关之 处参见方法实施例的部分说明即可。 以上所描述的装置实施例 仅仅是示意性的, 其中所述作为分离部件说明的单元可以是或 者也可以不是物理上分开的, 作为单元显示的部件可以是或者 也可以不是物理单元, 即可以位于一个地方, 或者也可以分布 到多个网络单元上。 可以根据实际的需要选择其中的部分或者 全部模块来实现本实施例方案的目 的。 本领域普通技术人员在 不付出创造性劳动的情况下, 即可以理解并实施。
以上对本发明实施例进行了详细介绍, 本文中应用了具体实施方式对本 发明进行了阐述, 以上实施例的说明只是用于帮助理解本发明的方法及设 备; 同时, 对于本领域的一般技术人员, 依据本发明的思想, 在具体实施方 式及应用范围上均会有改变之处, 综上所述, 本说明书内容不应理解为对本 发明的限制。

Claims

权利要求
1、 一种信号调整方法, 其特征在于, 用于调整第一小区发射校正信号 的功率, 所述方法包括:
所述第一小区按照预设功率向第二小区发射校正信号, 以使所述第二小 区判断其接收的校正信号的功率是否与基准功率相符;
所述第一小区接收所述第二小区返回的判断结果, 并在所述判断结果表 示所述第二小区接收的校正信号的功率与基准功率不相符时,根据所述判断 结果调整发射所述校正信号的功率, 以使所述第二小区接收的校正信号的功 率与所述基准功率相符。
2、 根据权利要求 1 所述的方法, 其特征在于, 如果所述判断结果包含 功率调整指示, 则所述根据所述判断结果调整发射所述校正信号的功率, 包 括:
所述第一小区根据所述功率调整指示按照预设步长逐渐调整发射所述 校正信号的功率, 直至使所述第二小区接收的校正信号的功率与所述基准功 率相符。
3、 根据权利要求 1 所述的方法, 其特征在于, 如果所述判断结果包含 功率调整指示和调整数值, 则所述根据所述判断结果调整发射所述校正信号 的功率, 包括:
所述第一小区根据所述功率调整指示按照所述调整数值调整发射所述 校正信号的功率。
4、 根据权利要求 1至 3任一项所述的方法, 其特征在于, 所述第一小 区调整发射所述校正信号的功率的方式为:
通过衰减器调整发射所述校正信号的功率和 /或通过数字域基带信号调 整发射所述校正信号的功率。
5、 根据权利要求 1至 4任一项所述的方法, 其特征在于, 所述第二小 区判断其接收的校正信号的功率是否与基准功率相符, 包括:
所述第二小区的远程射频单元接收所述校正信号, 并由所述第二小区的 基带单元判断所述校正信号的功率是否与所述基准功率相符。
6、 根据权利要求 1至 4任一项所述的方法, 其特征在于, 所述第一小 区接收所述第二小区返回的判断结果, 并根据所述判断结果调整发射所述校 正信号的功率, 包括:
所述第一小区的远程射频单元接收所述判断结果, 并由所述第一小区的 基带单元根据所述判断结果控制所述第一小区的远程射频单元调整发射所 述校正信号的功率。
7、 一种信号调整方法, 其特征在于, 用于调整第一小区接收校正信号 的功率, 所述方法包括:
所述第一小区接收第二小区发送的校正信号;
所述第一小区测量接收的所述校正信号的功率, 并判断所述功率是否与 基准功率相符,如果不相符,则调整所述第一小区接收所述校正信号的功率, 使所述第一小区接收到的所述校正信号的功率与所述基准功率相符。
8、 根据权利要求 7所述的方法, 其特征在于, 所述调整所述第一小区 接收所述校正信号的功率, 包括:
所述第一小区按照预设步长逐渐调整其接收所述校正信号的功率, 直至 使所述第一小区接收到的所述校正信号的功率与所述基准功率相符。
9、 根据权利要求 7所述的方法, 其特征在于, 所述调整所述第一小区 接收所述校正信号的功率, 包括:
所述第一小区计算接收的所述校正信号的功率与所述基准功率间的差 值, 并按照所述差值调整所述第一小区接收所述校正信号的功率。
10、 根据权利要求 7至 9任一项所述的方法, 其特征在于, 所述调整所 述第一小区接收所述校正信号的功率的方式为:
通过衰减器调整接收所述校正信号的功率。
11、 根据权利要求 7至 10任一项所述的方法, 其特征在于, 所述第一 小区测量接收的所述校正信号的功率, 并判断所述功率是否与基准功率相 符, 包括:
所述第一小区的基带单元测量所述第一小区的远程射频单元接收的校 正信号的功率, 并判断所述功率是否与所述基准功率相符。
12、 根据权利要求 7至 10任一项所述的方法, 其特征在于, 所述调整 所述第一小区接收所述校正信号的功率, 包括:
所述第一小区的基带单元控制所述第一小区的远程射频单元调整接收 所述校正信号的功率。
13、 一种信号调整装置, 其特征在于, 用于调整第一小区发射校正信号 的功率, 所述装置包括发射单元、 接收单元、 控制单元和调整单元; 所述发射单元, 用于按照预设功率向第二小区发射校正信号, 以使所述 第二小区判断其接收的校正信号的功率是否与基准功率相符;
所述接收单元, 用于接收所述第二小区返回的判断结果;
所述控制单元, 用于在所述接收单元接收的判断结果表示所述第二小区 接收的校正信号的功率与基准功率不相符时,控制所述调整单元根据所述判 断结果调整所述发射单元发射所述校正信号的功率, 以使所述第二小区接收 的校正信号的功率与所述基准功率相符。
14、 根据权利要求 13所述的装置, 其特征在于, 如果所述判断结果包 含功率调整指示, 则
所述控制单元, 具体用于控制所述调整单元根据所述功率调整指示按照 预设步长逐渐调整所述发射单元发射所述校正信号的功率, 直至使所述第二 小区接收的校正信号的功率与所述基准功率相符。
15、 根据权利要求 13所述的装置, 其特征在于, 如果所述判断结果包 含功率调整指示和调整数值, 则
所述控制单元, 具体用于控制所述调整单元根据所述功率调整指示按照 所述调整数值调整所述发射单元发射所述校正信号的功率。
16、 一种信号调整装置, 其特征在于, 用于调整第一小区接收校正信号 的功率, 所述装置包括接收单元、 判断单元、 控制单元和调整单元;
所述接收单元, 用于接收第二小区发送的校正信号;
所述判断单元, 用于测量所述接收单元接收的所述校正信号的功率, 并 判断所述功率是否与基准功率相符;
所述控制单元, 用于在所述判断单元判定功率不相符时, 控制所述调整 单元调整所述接收单元接收所述校正信号的功率,使所述接收单元接收到的 所述校正信号的功率与所述基准功率相符。
17、 根据权利要求 16所述的装置, 其特征在于,
所述控制单元, 具体用于控制所述调整单元按照预设步长逐渐调整所述 接收单元接收所述校正信号的功率, 直至使所述接收单元接收到的所述校正 信号的功率与所述基准功率相符。
18、 根据权利要求 16所述的装置, 其特征在于,
所述控制单元, 具体用于计算所述接收单元接收的所述校正信号的功率 与所述基准功率间的差值, 并控制所述调整单元按照所述差值调整所述接收 单元接收所述校正信号的功率。
19、 一种小区, 所述小区包括一个基带单元和至少一个远程射频单元, 所述远程射频单元包括业务通道, 所述业务通道对应有一个能与其它小区通 信的外部接口, 其特征在于,
所述远程射频单元还包括功率调整模块, 所述功率调整模块串接在任一 远程射频单元的业务通道与外部接口之间;
所述功率调整模块, 用于在所述基带单元的控制下调整所述小区发射校 正信号的功率,或者用于在所述基带单元的控制下调整所述小区接收校正信 号的功率。
20、 根据权利要求 19所述的小区, 其特征在于, 所述功率调整模块包 括第一开关电路、 第二开关电路、 和功率调整子模块;
所述第一开关电路与所述第二开关电路直接相连, 形成第一支路; 所述 第一开关电路经由所述功率调整子模块与所述第二开关电路相连, 形成第二 支路; 所述第一开关电路还与业务通道相连, 所述第二开关电路还与所述业 务通道对应的外部接口相连。
PCT/CN2014/077590 2013-05-15 2014-05-15 一种信号调整方法及装置、小区 WO2014183662A1 (zh)

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