WO2021023054A1 - 一种上行链路合路求和方法、装置及分布式天线系统 - Google Patents

一种上行链路合路求和方法、装置及分布式天线系统 Download PDF

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WO2021023054A1
WO2021023054A1 PCT/CN2020/105060 CN2020105060W WO2021023054A1 WO 2021023054 A1 WO2021023054 A1 WO 2021023054A1 CN 2020105060 W CN2020105060 W CN 2020105060W WO 2021023054 A1 WO2021023054 A1 WO 2021023054A1
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value
signal
attenuation
detection
cpri data
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PCT/CN2020/105060
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English (en)
French (fr)
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WO2021023054A8 (zh
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吴文权
王鑫
任爱林
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三维通信股份有限公司
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Priority to CA3134904A priority Critical patent/CA3134904C/en
Priority to EP20850837.4A priority patent/EP3930215A4/en
Priority to AU2020325457A priority patent/AU2020325457B2/en
Priority to US17/435,389 priority patent/US11979860B2/en
Publication of WO2021023054A1 publication Critical patent/WO2021023054A1/zh
Publication of WO2021023054A8 publication Critical patent/WO2021023054A8/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2609—Arrangements for range control, e.g. by using remote antennas

Definitions

  • This application relates to the field of communication technology, and in particular to an uplink combined summation method, device and distributed antenna system.
  • the indoor distributed system (Distributed Antenna System, referred to as DAS) consists of the main near-end unit (Administration Unit, referred to as AU).
  • An end unit (Subordinate Administration Unit, referred to as SAU), an extension unit (Extended Unit, referred to as EU), and a remote antenna unit (Remote Unit, referred to as RU) are composed.
  • the channel of the near-end unit (AU and SAU) will receive the downlink signal of the base station, digitally processed and transmitted to multiple remote units (RU) via optical fiber, and sent out through the antenna to complete the signal coverage.
  • the uplink signals of these RUs will be combined and added in EU or AU, and the signals will be transmitted back to AU or SAU through optical fiber.
  • the cable is sent back to the base station for processing.
  • the original bit width will not correctly represent the added signal, and the digital bit width will overflow, and the digital signal will overflow.
  • There will be signal spurs in the uplink signal band which will directly affect the receiving sensitivity and coverage of the base station, reduce the user capacity of the system, and in severe cases will directly cause the entire DAS system to fail to work normally.
  • the summed signal power is generally calculated and compared with the threshold power. If it is less than the threshold power and no power control is performed, no processing is performed. If it is greater than the threshold power, an adjustment value is calculated , After processing each added signal through this adjustment value, reduce the signal to below the threshold power.
  • the disadvantage of this method is that it first needs to calculate the summed power value, and it needs a multiplication processing module. When processing each in-phase quadrature signal (In-phase Quadrature, referred to as IQ signal), each IQ signal needs to be multiplied by In the current multi-channel and large-bandwidth DAS system design, a large number of multiplier resources need to be used.
  • the method needs to process the data of each uplink channel in the combined signal separately, which is complicated in networking.
  • the processing method is cumbersome and consumes Field-Programmable Gate Array (FPGA), that is, logic resources. This is a challenge to the current FPGA resources and power consumption, and it will also increase the DAS system The design cost.
  • FPGA Field-Programmable Gate Array
  • Another disadvantage of this method is that when calculating the power of the IQ signal, the CPRI data stream needs to be deframed, each signal is protected against overflow, and each signal is reframed and mapped, which complicates the system.
  • an uplink combined summation method includes:
  • Extract and sum the orthogonal IQ signal in the CPRI data stream determine the reference value of the IQ signal occupying the unit bandwidth carrier container, and determine the detection of the IQ signal occupying the unit bandwidth carrier container within a preset time period Determining the attenuation value corresponding to the fast decay of the IQ signal, and determining the attenuation value corresponding to the slow release of the IQ signal from the reference value and the detection value;
  • the gain control table shift the IQ signal in the CPRI data stream, and intercept the shifted IQ signal according to a preset bit width.
  • the bit width of the CPRI data stream is extended and the full-precision summation is performed; after the sum is extracted, the data in the CPRI data stream Orthogonal IQ signal, determine the reference value and detection value of the IQ signal, thereby determining the attenuation value corresponding to the fast decay and slow playback of the IQ signal, and generate the gain corresponding to the CPRI data according to the carrier mapping information of the system and the attenuation value
  • the control table according to the gain control table, shifts the IQ signal in the CPRI data stream, and intercepts the shifted IQ signal according to the preset bit width, which solves the problem of the uplink in the distributed antenna system. In the process of adding digital signals, the digital bit width partial overflow problem occurs.
  • the solution is simple to implement and has low power consumption.
  • the first maximum value of the IQ signal of the carrier container occupying the unit bandwidth, and obtaining the second maximum value of each channel of the IQ signal in the carrier container of the unit bandwidth within the first threshold time range according to the first maximum value, Obtain the third maximum value of each channel of the IQ signal per unit bandwidth carrier container within the second threshold time; calculate the IQ value corresponding to the rated power transmitted by the distributed antenna system, and set the IQ value to the preset value
  • the step is increased to generate a set of first reference values used to obtain fast decay.
  • the IQ value is used as the second reference value for slow playback.
  • the second maximum value determines a first detection value
  • the third maximum value determines a second detection value
  • the attenuation value corresponding to the fast decay of the IQ signal is obtained according to the first reference value and the first detection value
  • the attenuation value corresponding to the fast decay of the IQ signal is obtained according to the second reference value and the second detection value
  • Obtaining the attenuation value corresponding to the slow playback of the IQ signal includes:
  • the first detection value and the first reference value are sequentially compared from large to small, and if the first detection value is greater than the first reference value, the comparison is stopped to determine the detection value
  • the comparison result with the first reference value, and the attenuation value corresponding to the fast decay of the IQ signal is determined according to the comparison result.
  • the first detection value is less than the minimum step value of the first reference value, The IQ signal does not undergo fast decay processing;
  • the second detection value is compared with the lowest threshold value of the second reference value, and in the case that the second detection value is lower than the lowest threshold value, it is subtracted after the second threshold time. Decrease the attenuation value corresponding to the unit step value, and determine the attenuation value corresponding to the slow playback of the IQ signal. If the second detection value is greater than the minimum threshold, the slow playback process is not performed.
  • the preset value includes but is not limited to one of the following: 0.5db, 1db, 1.5db, 2db, and 2.5db.
  • the shifting the IQ signal in the CPRI data stream according to the gain control table includes:
  • the gain control table perform three-stage shift steps on the IQ signal in the CPRI data stream.
  • the three-stage shift steps are 6*N, 3, and 1.5 respectively, where N is 1, 2 or 3.
  • an uplink combined summation device including an addition module, a detection module, and a gain module;
  • the addition module is used to obtain the uplink common public radio interface CPRI data stream of the channel of the main near-end unit AU or the extension unit EU in the distributed antenna system, expand the bit width of the CPRI data stream, and perform full-precision summation;
  • the detection module is used to extract the orthogonal IQ signal in the CPRI data stream after summation, determine the reference value of the IQ signal occupying the unit bandwidth carrier container, and determine the value of the unit bandwidth carrier container occupied within a preset time period. Determining the attenuation value corresponding to the fast decay of the IQ signal, and determining the attenuation value corresponding to the slow release of the IQ signal from the reference value and the detection value;
  • the detection module is further configured to obtain carrier mapping information of the distributed antenna system, and generate a gain control table corresponding to the CPRI data according to the carrier mapping information and the attenuation value, wherein the gain control table The attenuation value in and corresponds to the carrier mapping information one to one;
  • the gain module is configured to shift the IQ signal in the CPRI data stream after the summation according to the gain control table, and intercept the shifted IQ signal according to a preset bit width.
  • the gain module is configured to perform three-stage shift steps on the IQ signal in the CPRI data stream according to the gain control table, and the three-stage shift steps are 6 respectively. *N, 3 and 1.5, where N is 1, 2 or 3.
  • a distributed antenna system includes: a main near-end unit AU, an extension unit EU, and a remote unit RU, wherein the AU is connected to the EU, and the The AU is connected to at least two of the RUs, the EU is connected to at least two of the RUs, and the CPRI data flow of the uplink public radio interface of the system is combined and added for the first time in the EU through the RU, And the CPRI data stream performs the second combined addition in the AU through the EU, and the processing process of the first combined addition and the second combined addition includes:
  • Extract and sum the orthogonal IQ signal in the CPRI data stream determine the reference value of the IQ signal occupying the unit bandwidth carrier container, and determine the detection of the IQ signal occupying the unit bandwidth carrier container within a preset time period Determining the attenuation value corresponding to the fast decay of the IQ signal, and determining the attenuation value corresponding to the slow release of the IQ signal from the reference value and the detection value;
  • the carrier mapping information has a one-to-one correspondence
  • the gain control table shift the IQ signal in the CPRI data stream, and intercept the shifted IQ signal according to a preset bit width.
  • the first maximum value of the IQ signal of the carrier container occupying the unit bandwidth, and obtaining the second maximum value of each channel of the IQ signal in the carrier container of the unit bandwidth within the first threshold time range according to the first maximum value, Obtain the third maximum value of each channel of the IQ signal per unit bandwidth carrier container within the second threshold time; calculate the IQ value corresponding to the rated power transmitted by the distributed antenna system, and use the IQ value in steps of 1.5db Increase it to generate a set of first reference values used to obtain fast decay, the value of the IQ value less than 1.5db is used as a second reference value for slow playback, and the first detection value is determined by the second maximum value , The second detection value is determined by the third maximum value; the attenuation value corresponding to the fast decay of the IQ signal is obtained according to the first reference value and the first detection value, and the attenuation value corresponding to the fast decay of the IQ signal is obtained according to the second reference value and the The second detection value acquires an attenuation value
  • the attenuation value corresponding to the fast decay of the IQ signal is obtained according to the first reference value and the first detection value
  • the attenuation value corresponding to the fast decay of the IQ signal is obtained according to the second reference value and the second detection value
  • Obtaining the attenuation value corresponding to the slow playback of the IQ signal includes:
  • the first detection value and the first reference value are sequentially compared from large to small, and if the first detection value is greater than the first reference value, the comparison is stopped to determine the detection value
  • the comparison result with the first reference value, and the attenuation value corresponding to the fast decay of the IQ signal is determined according to the comparison result.
  • the first detection value is less than the minimum step value of the first reference value, The IQ signal does not undergo fast decay processing;
  • the second detection value is compared with the lowest threshold value of the second reference value, and in the case that the second detection value is lower than the lowest threshold value, it is subtracted after the second threshold time. Decrease the attenuation value corresponding to the unit step value, and determine the attenuation value corresponding to the slow playback of the IQ signal. If the second detection value is greater than the minimum threshold, the slow playback process is not performed.
  • the shifting the IQ signal in the CPRI data stream according to the gain control table includes:
  • the gain control table perform three-stage shift steps on the IQ signal in the CPRI data stream.
  • the three-stage shift steps are 6*N, 3, and 1.5 respectively, where N is 1, 2 or 3.
  • Figure 1 is a schematic diagram of a DAS system networking in an embodiment of the present application
  • FIG. 2 is a schematic diagram of another DAS system networking according to an embodiment of the present application.
  • FIG. 3 is a schematic diagram of carrier mapping information on the primary AU according to an embodiment of the present application.
  • FIG. 4 is a schematic diagram of carrier mapping information of a remote unit RU according to an embodiment of the present application.
  • FIG. 5 is a flowchart of an uplink combined summation method according to an embodiment of the present application.
  • FIG. 6 is a flowchart of an uplink summation overflow protection processing according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of carrier mapping information corresponding to a gain control table according to an embodiment of the present application.
  • Fig. 8 is a schematic structural diagram of an uplink combined summation device according to an embodiment of the present application.
  • Figure 1 is a schematic diagram of a DAS system network according to an embodiment of the application. As shown in Figure 1, it includes a main near-end unit AU.
  • the uplink can support multiple channel signals (not shown here).
  • the remote unit RU1 and the extension unit EU are cascaded through the end unit AU, and the remote units RU2 and RU3 are cascaded under the extension unit EU.
  • Each RU has multiple radio frequency channels (not shown here).
  • the system can support the cascading of more remote units.
  • the radio frequency channel of the remote unit RU1 is mapped to a channel of the main near-end unit AU through the carrier mapping function.
  • the channels of the remote unit RU2 and the remote unit RU3 After the channels of the remote unit RU2 and the remote unit RU3 receive the uplink signal of the mobile device, they complete the first in the extension unit EU. Once combined and added, the EU transmits the data stream of the IQ signal to the main near-end unit AU through the optical fiber. In the main near-end unit AU, the second combined and added is completed, and then the combined signal is sent to the main near-end unit. The end unit AU sends one channel to the base station for processing.
  • FIG. 2 is a schematic diagram of another DAS system networking according to an embodiment of the present application. As shown in Figure 2, it includes a master near-end unit AU and two slave near-end units SAU1 and SAU2.
  • the uplink can support 12 channels. Signals B1 to B12, the main near-end unit AU cascades the remote unit RU1 and the extension unit EU through the optical fiber, the remote unit RU1 cascades the remote unit RU2 at the next level, and the extension unit EU cascades the remote units RU3 and RU4.
  • Each RU1, RU2, RU3 and RU4 have 4 radio frequency channels RF1 to RF4. According to actual needs, the system can support the cascading of more remote units.
  • the radio frequency channels of the remote units RU1 and RU2 are mapped to the main near-end unit AU or one of the channels of the sub-near-end units SAU1 and SAU2 through the carrier mapping function.
  • the remote units RU3 and RU4 channels receive the uplink signal from the mobile device
  • the extension unit EU transmits the IQ data stream to the main AU through optical fiber.
  • the main near-end unit AU receives the uplink signal from the main near-end unit AU.
  • the second combined addition is completed, and then the uplink signal is sent.
  • the transmission of IQ data and control signals between all models is accomplished through optical fibers, and the above two DAS system networking modes can be applied in the embodiments of this application.
  • Fig. 3 is a schematic diagram of carrier mapping information on the primary near-end unit AU according to an embodiment of the present application. As shown in Fig.
  • IQ signals are spliced together with a preset bit width according to certain rules before data compression, and placed In a carrier container, where the preset bit width can be 12bit, a carrier container is defined to represent a signal bandwidth of 10M, and how many carrier containers the IQ signal occupies is determined according to the signal bandwidth, and the corresponding position below uses another A group of data represents the carrier container.
  • 0000 in the lower row of Figure 3 represents the data stream of the IQ signal of AU channel B1.
  • Each grid represents 1 carrier container, which means that the signal occupies a bandwidth of 40M.
  • AU channel B3 The data stream signal of the IQ signal occupies a bandwidth of 70M.
  • FIG. 4 is a schematic diagram of the carrier mapping information of the remote unit RU according to an embodiment of the present application.
  • a 40M IQ signal is placed at the corresponding position of the CPRI data stream, and another set of data is used to represent the carrier mapping information.
  • the lower row 1111 indicates that it is mapped to the RU radio frequency channel RF1.
  • the mapping of the entire DAS system is that the 40M signal of the radio frequency channel 1 on the main near-end unit AU is mapped to the radio frequency channel 2 of RU1, and the uplink and downlink signals are transmitted at corresponding positions through these carrier containers.
  • the RU3 cascaded under the EU is also mapped to the main AU channel 1.
  • the data stream of the IQ signal of this channel will be placed in the same position of the carrier container.
  • the upstream signal flow of these RUs is In EU, it needs to be combined and added and then sent back to the main AU.
  • the function of uplink combined anti-overflow can be completed in this position.
  • FIG. 5 is a flowchart of an uplink combined summation method according to an embodiment of the present application. As shown in FIG. 5, the method includes the following steps:
  • Step S502 Obtain the CPRI data stream of the uplink universal public radio interface of the main near-end unit AU or the extension unit EU channel in the system, expand the bit width of the CPRI data stream and sum it with full precision; due to the binary signal transmitted in the communication system
  • the bit width is fixed.
  • the sum of multiple binary numbers may cause the fixed bit width to not correctly represent the result of the sum, which leads to overflow.
  • the aforementioned full-precision summation is based on the binary number of the summation, first expand the summed binary by a certain high sign bit, and then perform the summation operation to avoid data overflow.
  • Step S504 Extract the orthogonal IQ signal in the CPRI data stream after the summation, determine the reference value of the IQ signal occupying the unit bandwidth carrier container, and determine the detection of the IQ signal occupying the unit bandwidth carrier container within a preset time period Determine the attenuation value corresponding to the fast decay of the IQ signal from the reference value and the detection value, and determine the attenuation value corresponding to the slow release of the IQ signal;
  • the method for determining the reference value can be by calculating the IQ value corresponding to the rated power transmitted by the distributed antenna system, and increasing the IQ value in 1.5db steps to generate a set of first reference values for obtaining fast decay , Use the value of IQ value less than 1.5db as the second reference value for slow playback.
  • determining the detection value of the IQ signal occupying the unit bandwidth carrier container within the preset time period can determine the second detection value of the IQ signal occupying the unit bandwidth carrier container within 4us, and determining the occupied unit bandwidth carrier container within 30ms The third detection value of the IQ signal.
  • Step S506 Obtain carrier mapping information of the distributed antenna system, and generate a gain control table corresponding to the CPRI data according to the carrier mapping information and the attenuation value, wherein the attenuation value in the gain control table is mapped to the carrier Information one-to-one correspondence;
  • Step S508 shift the IQ signal in the CPRI data stream according to the gain control table, and intercept the shifted IQ signal according to a preset bit width.
  • the bit width of the CPRI data stream is extended and the full precision summation is performed; after the summation, the orthogonal IQ signal in the CPRI data stream is extracted, and the reference value and detection value of the IQ signal are determined, so as to determine the IQ signal.
  • the attenuation value corresponding to the fast decay and slow playback of the signal is generated according to the carrier mapping information of the system and the attenuation value, and the gain control table corresponding to the CPRI data is generated, and the IQ signal in the CPRI data stream is shifted according to the gain control table. Bits, and intercept the shifted IQ signal according to the preset bit width, which solves the problem of digital bit width partial overflow in the process of adding uplink digital signals in the distributed antenna system. This solution is simple to implement. Low power consumption.
  • the first maximum value of the IQ signal, the second maximum value of each channel of the IQ signal in the carrier container of the unit bandwidth within the first threshold time range is obtained according to the first maximum value, and so on to obtain the unit within the second threshold time
  • the third maximum value of the IQ signal for each channel of the bandwidth carrier container; the IQ value corresponding to the rated power transmitted by the distributed antenna system is calculated, and the IQ value is increased by a preset value to generate a set of Acquire the first reference value of fast decay.
  • the IQ value is less than the preset value, the IQ value is used as the second reference value for slow playback.
  • the second maximum value determines the first detection value
  • the third The maximum value determines the second detection value
  • the preset value may include but is not limited to one of the following: 0.5db, 1db, 1.5db, 2db, and 2.5db, preferably the preset value is 1.5db.
  • the determination of the attenuation value corresponding to the fast decay of the IQ signal can be implemented in multiple ways.
  • the first detection value and the first reference value can be compared in order from large to small, and the first detection value is greater than the first reference value. In the case of a reference value, stop the comparison, determine the comparison result of the detection value and the first reference value, and determine the attenuation value corresponding to the fast decay of the IQ signal according to the comparison result.
  • the first detection value is less than the first reference value
  • the IQ signal is not processed for fast decay;
  • the second detection value is compared with the lowest threshold of the second reference value, and the second detection value is lower than the lowest threshold.
  • the threshold value the attenuation corresponding to the unit step value is reduced after the second threshold time, and the attenuation value corresponding to the slow release of the IQ signal is determined, and the second detection value is greater than the minimum threshold , The slow playback process is not performed.
  • the above method of determining the attenuation value of the fast fade and slow playback has less impact on the link with lower power in the uplink combined signal.
  • FIG. 6 is a flowchart of an uplink sum overflow protection processing according to an embodiment of the present application. As shown in FIG. 6, the processing process includes the following steps:
  • Step S602 in the EU or the primary near-end unit AU, perform a full-precision summation of the CPRI data stream through bit width expansion, as described in the previous carrier mapping, receive the uplink data transmitted to the same primary near-end unit AU channel
  • the streams are placed in the same position, so that the CPRI data streams mapped to the same main near-end unit AU channel can directly complete the summation.
  • CPRI data streams with up to 8 optical ports can be summed in the expansion unit EU and the main near-end unit AU. Therefore, it is necessary to extend the combined and summed IQ signal bit width by 4 bits to complete Full precision summation without distortion.
  • Step S604 First, extract the data in the carrier container with a unit bandwidth of 10M in sequence according to the existing filling rules of the IQ signal, calculate the absolute value, and find the first maximum value, and then calculate the first value.
  • the threshold time is the second maximum value in the 10M carrier container in the range of 4us, which is used as the first detection value for the quick response of the overflow protection. Here you don’t need to calculate the signal power. Convert the value of the IQ signal for every 1.5dbm power.
  • the values are compared sequentially from large to small, until the first detection value is found to be greater than the first reference value, and the stop is stopped.
  • a 4-bit value is used to indicate how many steps the first detection value is greater than the first reference value, and the value is saved. If the first detection value is less than the minimum step value, no fast decay processing is performed.
  • the statistical second threshold time is the third maximum value of the 10M carrier container in the range of 30ms, which is used as the second detection value of the slow playback gain for overflow protection.
  • Step S606 Obtain carrier mapping information of the distributed antenna system, and generate a gain control table corresponding to the CPRI data according to the carrier mapping information and the attenuation value.
  • the implementation process is to process the IQ signal data of the 12 uplink channels in real time.
  • the global carrier mapping information of the entire DAS system needs to be issued through the master AU.
  • the global carrier mapping information mainly needs to know the carrier mapping information of a total of 12 channels of the master AU and two slave AUs. Here, 0 to 11 are used to indicate this in turn. 12 channels, corresponding to the mapping bandwidth of AU and RU.
  • the pipeline processing method is used to process the data streams of the 12 IQ signals in each frame in sequence.
  • FIG. 7 is a schematic diagram of carrier mapping information corresponding to a gain control table according to an embodiment of the present application.
  • the protection processing value fast fading and slow amplification attenuation value
  • the carrier mapping information generates a gain control table (GAIN TABLE) signal stream, where Gain0 and Gain2 are gain values corresponding to the attenuation values.
  • Step S608 shift the IQ signal in the CPRI data stream according to the gain control table, and perform three-stage shift steps on the IQ signal in the CPRI data stream, and the three-stage shift steps are 6 respectively.
  • N 1, 2 or 3.
  • the specific implementation method is to set the three-level stepping to 6*N, 3, and 1.5 respectively, and the three-level stepping is used for the fast decay function.
  • the output gain table signal it is arranged in sequence according to the carrier mapping signal, which is represented by 4bit. , When the high 2bit data is not 0, it will be processed according to the level 1 step 6. According to the value of the 2bit, the multiple of 6 is attenuated.
  • the IQ signal is correspondingly complemented and the sign bit is shifted to the right by 1 To 3 bits, the signal is attenuated by 6, 12, 18.
  • the lower 2bit control value means that the IQ signal is attenuated by 3 or 1.5, and the second bit is 1 for attenuation of 3, and the data of the IQ signal after the first step processing is divided into two
  • the first step is to complete the attenuation of 3.
  • the first step is to shift the sign bit to the right by one bit plus the sign bit to the right by three bits.
  • the data complement of the IQ signal of the first step is shifted to the right by 3 bits and then the first step is added.
  • One step of the IQ signal data complete the attenuation of step 3.
  • the lowest bit bit is 1, which means that the attenuation is 1.5.
  • the processing is still completed in two steps.
  • the data of the IQ signal after the second stepping process is first complemented by the sign bit to the right by three bits plus the data of the IQ signal after the second stepping.
  • the second step is to shift the I Q data complement sign bit of the first step to the right by 1 bit and 3 bits and add them to complete the processing of 1.5 steps.
  • the signal is truncated according to a certain bit width to get 12bit data After that, the anti-overflow function of the signal is completed.
  • the processed IQ signal Since the solution is completed in a pipelined manner on the CPRI data stream through global carrier mapping information, the processed IQ signal does not need to be re-framed and carrier-mapped for CPRI, and can be directly transmitted to the CPRI frame for transmission via optical fiber, saving understanding of frames
  • the processing of the system simplifies the system.
  • FIG. 8 is a schematic structural diagram of an uplink combined and summation device according to an embodiment of the present application. As shown in FIG. 8, the device Including addition module 82 (SUM module), detection module 84 (DETECT module) and gain module 86 (GAINX module);
  • addition module 82 SUM module
  • detection module 84 DETECT module
  • gain module 86 GAINX module
  • the addition module 82 is used to obtain the uplink common public radio interface CPRI data stream of the channel of the main near-end unit AU or the extension unit EU in the distributed antenna system, expand the bit width of the CPRI data stream, and perform full-precision summation;
  • the detection module 84 is used to extract the orthogonal IQ signal in the CPRI data stream after summation, determine the reference value of the IQ signal occupying the unit bandwidth carrier container, and determine the IQ signal occupying the unit bandwidth carrier container within a preset time period The detection value of the signal, determining the attenuation value corresponding to the fast decay of the IQ signal from the reference value and the detection value, and determining the attenuation value corresponding to the slow release of the IQ signal;
  • the detection module 84 is also used to obtain carrier mapping information of the distributed antenna system, and generate a gain control table corresponding to the CPRI data according to the carrier mapping information and the attenuation value, wherein the attenuation value in the gain control table One-to-one correspondence with the carrier mapping information;
  • the gain module 86 is used for shifting the IQ signal in the CPRI data stream after the summation according to the gain control table, and intercepting the shifted IQ signal according to a preset bit width.
  • each optical path of EU and main AU receives the uplink CPRI data stream of each channel and performs full-precision summation in the SUM module.
  • the summed data enters the GAINX module and is calculated by the DETECT module.
  • the output gain control table (GAIN TABLE) is arranged in sequence according to the carrier mapping signal to adjust the IQ signal of the combined and summed CPRI data stream in real time to complete the upstream combined anti-overflow function, and the adjusted CPRI data stream is used as output transmission
  • the above-mentioned summation scheme can be multiplexed in the EU and the main AU, which solves the problem of digital bit width partial overflow in the process of adding uplink digital signals in the distributed antenna system. Low consumption.
  • a distributed antenna system is also provided.
  • the system includes: a main near-end unit AU, an extension unit EU, and a remote unit RU.
  • the AU is connected to the EU, and the AU is connected to at least two of the RU, the EU is connected to at least two RUs, the CPRI data flow of the uplink public radio interface of the system is combined and added for the first time in the EU through the RU, and the CPRI data flow is performed in the AU through the EU
  • the second combined addition, the processing of the first combined addition and the second combined addition include:
  • the reference value and the detection value determine the attenuation value corresponding to the fast decay of the IQ signal, and determine the attenuation value corresponding to the slow release of the IQ signal;
  • Acquire carrier mapping information of the distributed antenna system and generate a gain control table corresponding to the CPRI data according to the carrier mapping information and the attenuation value, wherein the attenuation value in the gain control table and the carrier mapping information are one-to-one correspond;
  • the gain control table shift the IQ signal in the CPRI data stream, and intercept the shifted IQ signal according to a preset bit width.
  • the bit width overflow protection that can quickly respond to the combined signal in the CPRI data stream in the AU or EU can solve the problem of digital signal overflow in the DAS uplink combined summation process.
  • the solution can not use FPGA digital signal processing (Digital Signal Process, referred to as DSP) resources, and complete the functional solution with a small FPGA resource consumption, which is simple to implement, reduces power consumption, and can reduce the number of uplinks. The influence of the link with less power in the signal.
  • DSP Digital Signal Process
  • a software is also provided, and the software is used to execute the technical solutions described in the above-mentioned embodiments and preferred embodiments.
  • the storage medium includes, but is not limited to, an optical disk, a floppy disk, a hard disk, and a rewritable memory.
  • Non-volatile memory may include read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory.
  • Volatile memory may include random access memory (RAM) or external cache memory.
  • RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous chain Channel (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM
  • DRAM memory bus dynamic RAM
  • RDRAM memory bus dynamic RAM

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Abstract

本申请涉及一种上行链路合路求和方法、装置及分布式天线系统，其中，通过获取系统中主近端单元AU或者扩展单元EU的通道的上行CPRI数据流，对该CPRI数据流进行位宽扩展并进行全精度求和；提取求和后该CPRI数据流中的正交IQ信号，确定IQ信号的基准值和检测值，从而确定与该IQ信号快衰慢放对应的衰减值，依据系统的该载波映射信息和该衰减值，生成与该CPRI数据对应的增益控制表，依据该增益控制表对该CPRI数据流中该IQ信号进行移位，并按预设位宽截取该移位后的该IQ信号，解决了在分布式天线系统中上行链路数字信号相加过程中，产生数字位宽部分溢出问题，该方案实现简单，功耗低。

Description

一种上行链路合路求和方法、装置及分布式天线系统
相关申请
本申请要求2019年8月2日申请的，申请号为201910712548.1，发明名称为“一种上行链路合路求和方法、装置及分布式天线系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，特别是涉及一种上行链路合路求和方法、装置及分布式天线系统。
背景技术
分布式天线系统是目前解决室内无线通信覆盖以及大型室外场所无线覆盖的主要方案，室内分布式系统(Distributed Antenna System，简称为DAS)由主近端单元(Administration Unit，简称为AU)，从近端单元(Subordinate Administration Unit，简称为SAU)，扩展单元(Extended Unit，简称为EU)和远端天线单元(Remote Unit，简称为RU)组成。近端单元(AU和SAU)的通道会接收基站的下行信号，数字处理后通过光纤传输到多个远端单元(RU)，通过天线发送出去完成信号的覆盖。当有多个RU的射频通道都映射到AU或者SAU的同一个通道，那么这些RU的上行信号会在EU中或者AU中通过合路相加处理后，信号通过光纤传回AU或者SAU，通过线缆传送回基站进行处理。上行数字信号相加过程中，由于数字处理过程位宽的限制，如果不做处理，就会出现原有的位宽不能正确表示相加后的信号而产生数字位宽部分的溢出，数字信号溢出会使上行信号带内出现信号杂散，会直接影响基站的接收灵敏度和覆盖范围，降低系统的用户容量，严重时会直接导致整个DAS系统无法正常工作。
在相关技术中，一般是通过计算求和后的信号功率，将该功率与门限功率比较，如果小于门限功率并且没有做功率控制，则不进行处理，如果大于门限功率，则计算出一个调节值，将相加的每路信号都通过这个调节值处理后将信号降低到门限功率以下。该方法的缺点在于首先需要计算求和后的功率值，需要有乘法处理模块，对每路同相正交信号(In-phase Quadrature，简称IQ信号)做处理时也需要每路IQ信号乘以得出的调节值，在现在多通道大带宽的DAS系统设计中，就需要使用大量的乘法器资源，同时，该方法需要分别处理合路信号中每个上行通道链路的数据，在组网复杂的系统中，处理方法显得繁琐，消耗现场可编程门阵列(Field－Programmable Gate Array，简称为FPGA)，即逻辑资源，这对于目前FPGA 资源和功耗是一个挑战，同时也会加大DAS系统的设计成本。该方法另外一个缺点是在计算IQ信号的功率时需要对CPRI数据流进行解帧处理，对每路信号做防溢出保护功能，再将每路信号重新组帧映射，将系统复杂化。
针对相关技术中，在分布式天线系统中，上行链路数字信号相加过程中，产生数字位宽部分溢出问题，目前尚未提出有效的解决方案。
发明内容
根据本申请的各种实施例，提供一种上行链路合路求和方法，所述方法包括：
获取系统中主近端单元AU或者扩展单元EU的通道的上行通用公共无线接口
(Common Public Radio Interface，简称为CPRI)数据流，对所述CPRI数据流进行位宽扩展并进行全精度求和；
提取求和后所述CPRI数据流中的正交IQ信号，确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定与所述IQ信号慢放对应的衰减值；
获取天线系统的载波映射信息，依据所述载波映射信息和所述衰减值，生成与所述CPRI数据对应的增益控制表，其中，所述增益控制表中的所述衰减值与所述载波映射信息一一对应；
依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行移位，并按预设位宽截取所述移位后的所述IQ信号。
上述上行链路合路求和方法具有以下优点：
通过获取分布式天线系统中主近端单元AU或者扩展单元EU的通道的上行CPRI数据流，对该CPRI数据流进行位宽扩展并进行全精度求和；提取求和后该CPRI数据流中的正交IQ信号，确定IQ信号的基准值和检测值，从而确定与该IQ信号快衰慢放对应的衰减值，依据系统的该载波映射信息和该衰减值，生成与该CPRI数据对应的增益控制表，依据该增益控制表，对该CPRI数据流中该IQ信号进行移位，并按预设位宽截取该移位后的该IQ信号，解决了在分布式天线系统中，上行链路数字信号相加过程中，产生数字位宽部分溢出问题，该方案实现简单，功耗低。
在其中一个实施例中，所述确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定与所述IQ信号慢放对应的衰减值包括：
获取占用单位带宽的载波容器的所述IQ信号的第一最大值，根据所述第一最大值获取第一阈值时间范围内单位带宽的载波容器内每路所述IQ信号的第二最大值，获取第二阈值时间内单位带宽载波容器的每路所述IQ信号的第三最大值；计算出所述分布式天线系统传输的额定功率对应的IQ数值，将所述IQ数值以预设值的步进增大来生成一组用来获取快衰的第一基准值，所述IQ数值小于所述预设值的情况下，所述IQ数值用来做慢放的第二基准值，由所述第二最大值确定第一检测值，由所述第三最大值确定第二检测值；
依据所述第一基准值和所述第一检测值获取与所述IQ信号快衰对应的衰减值，依据所述第二基准值和所述第二检测值获取与所述IQ信号慢放对应的衰减值。
在其中一个实施例中，所述依据所述第一基准值和所述第一检测值获取与所述IQ信号快衰对应的衰减值，依据所述第二基准值和所述第二检测值获取与所述IQ信号慢放对应的衰减值包括：
将所述第一检测值和所述第一基准值从大到小依次进行比较，在所述第一检测值大于所述第一基准值的情况下，停止所述比较，确定所述检测值和所述第一基准值比较结果，依据所述比较结果确定所述IQ信号快衰对应的衰减值，在所述第一检测值小于所述第一基准值的最小步进值的情况下，所述IQ信号不做快衰处理；
将所述第二检测值和所述第二基准值的最低门限值进行比较，在所述第二检测值低于所述最低门限值的情况下，在所述第二阈值时间后减小与单位步进值对应的衰减量，确定与所述IQ信号慢放对应的衰减值，在所述第二检测值大于所述最低门限值，则不做慢放处理。
在其中一个实施例中，所述预设值包括但不限于以下之一：0.5db、1db、1.5db、2db和2.5db。
在其中一个实施例中，所述依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行移位包括：
依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行三级移位步进，所述三级移位步进分别为6*N、3和1.5，其中，N为1、2或者3。
根据本申请的各种实施例，还提供一种上行链路合路求和装置，所述装置包括加法模块、检测模块和增益模块；
所述加法模块用于获取分布式天线系统中主近端单元AU或者扩展单元EU的通道的上行通用公共无线接口CPRI数据流，对所述CPRI数据流进行位宽扩展并进行全精度求和；
所述检测模块用于提取求和后所述CPRI数据流中的正交IQ信号，确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定 与所述IQ信号慢放对应的衰减值；
所述检测模块还用于获取所述分布式天线系统的载波映射信息，依据所述载波映射信息和所述衰减值，生成与所述CPRI数据对应的增益控制表，其中，所述增益控制表中的所述衰减值与所述载波映射信息一一对应；
所述增益模块用于依据所述增益控制表，对求和后所述CPRI数据流中所述IQ信号移位，并按预设位宽截取所述移位后的所述IQ信号。
在其中一个实施例中，所述增益模块用于依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行三级移位步进，所述三级移位步进分别为6*N、3和1.5，其中，N为1、2或者3。
根据本申请的各种实施例，还提供一种分布式天线系统，所述系统包括：主近端单元AU、扩展单元EU和远端单元RU，其中，所述AU连接所述EU，所述AU连接至少两个所述RU，所述EU连接至少两个所述RU，该系统的上行链路的公共无线接口CPRI数据流通过所述RU在所述EU进行第一次合路相加，以及CPRI数据流通过所述EU在所述AU进行第二次合路相加，所述第一次合路相加和所述第二次合路相加的处理过程包括：
获取所述AU或者所述EU的上行链路通道的CPRI数据流，对所述CPRI数据流进行位宽扩展并进行全精度求和；
提取求和后所述CPRI数据流中的正交IQ信号，确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定与所述IQ信号慢放对应的衰减值；
获取所述分布式天线系统的载波映射信息，依据所述载波映射信息和所述衰减值，生成与所述CPRI数据对应的增益控制表，其中，所述增益控制表中的所述衰减值与所述载波映射信息一一对应；
依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行移位，并按预设位宽截取所述移位后的所述IQ信号。
在其中一个实施例中，所述确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定与所述IQ信号慢放对应的衰减值包括：
获取占用单位带宽的载波容器的所述IQ信号的第一最大值，根据所述第一最大值获取第一阈值时间范围内单位带宽的载波容器内每路所述IQ信号的第二最大值，获取第二阈值时间内单位带宽载波容器的每路所述IQ信号的第三最大值；计算出所述分布式天线系统传输 的额定功率对应的IQ数值，将所述IQ数值以1.5db的步进增大来生成一组用来获取快衰的第一基准值，所述IQ数值小于1.5db的数值用来做慢放的第二基准值，由所述第二最大值确定第一检测值，由所述第三最大值确定第二检测值；依据所述第一基准值和所述第一检测值获取与所述IQ信号快衰对应的衰减值，依据所述第二基准值和所述第二检测值获取与所述IQ信号慢放对应的衰减值。
在其中一个实施例中，所述依据所述第一基准值和所述第一检测值获取与所述IQ信号快衰对应的衰减值，依据所述第二基准值和所述第二检测值获取与所述IQ信号慢放对应的衰减值包括：
将所述第一检测值和所述第一基准值从大到小依次进行比较，在所述第一检测值大于所述第一基准值的情况下，停止所述比较，确定所述检测值和所述第一基准值比较结果，依据所述比较结果确定所述IQ信号快衰对应的衰减值，在所述第一检测值小于所述第一基准值的最小步进值的情况下，所述IQ信号不做快衰处理；
将所述第二检测值和所述第二基准值的最低门限值进行比较，在所述第二检测值低于所述最低门限值的情况下，在所述第二阈值时间后减小与单位步进值对应的衰减量，确定与所述IQ信号慢放对应的衰减值，在所述第二检测值大于所述最低门限值，则不做慢放处理。
在其中一个实施例中，所述依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行移位包括：
依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行三级移位步进，所述三级移位步进分别为6*N、3和1.5，其中，N为1、2或者3。
附图说明
为了更好地描述和说明这里公开的那些发明的实施例和/或示例，可以参考一幅或多幅附图。用于描述附图的附加细节或示例不应当被认为是对所公开的发明、目前描述的实施例和/或示例以及目前理解的这些发明的最佳模式中的任何一者的范围的限制。
图1是本申请实施例的一个DAS系统组网的示意图；
图2是本申请实施例的另一个DAS系统组网的示意图；
图3是本申请实施例的主AU上载波映射信息的示意图；
图4是本申请实施例的远端单元RU的载波映射信息的示意图；
图5是本申请实施例的一种上行链路合路求和方法的流程图；
图6是本申请实施例的一种上行链路求和溢出保护处理的流程图；
图7是本申请实施例的一种增益控制表对应的载波映射信息的示意图；
图8是本申请实施例的一种上行链路合路求和装置的结构示意图。
具体实施方式
下文中将参考附图并结合实施例来详细说明本申请。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
在本申请的实施例中，提出一种能够完成上行链路信号合路后溢出保护功能的实施方案。图1是根据本申请实施例的一个DAS系统组网的示意图，如图1所示，包括一个主近端单元AU，上行链路可以支持多个通道信号(此处省略未画)，主近端单元AU下通过光纤级联远端单元RU1，扩展单元EU，扩展单元EU下级联远端单元RU2和RU3，每个RU有多个射频通道(此处省略未画)，根据实际需要，该系统可支持更多的远端单元的级联。远端单元RU1的射频通道通过载波映射功能被映射到主近端单元AU的某一个通道上，远端单元RU2和远端单元RU3通道接收移动设备的上行信号后，在扩展单元EU中完成第一次合路相加，EU通过光纤向主近端单元AU传送IQ信号的数据流，在主近端单元AU中，完成第二次合路相加，然后将该合路信号发送到主近端单元AU一个通道后再发送到基站进行处理。
图2是根据本申请实施例的另一个DAS系统组网的示意图，如图2所示，包括一个主近端单元AU和两个从近端单元SAU1和SAU2，上行链路可以支持12个通道信号B1至B12，主近端单元AU通过光纤级联远端单元RU1和扩展单元EU，远端单元RU1下一级级联远端单元RU2，扩展单元EU下级联远端单元RU3和RU4，每个RU1、RU2、RU3和RU4均有4个射频通道RF1至RF4,根据实际需要，系统可支持更多的远端单元的级联。远端单元RU1和RU2的射频通道通过载波映射功能被映射到主近端单元AU或者从近端单元SAU1、SAU2的某一个通道上，远端单元RU3和RU4通道接收移动设备的上行信号后，在扩展单元中EU中完成第一次合路相加，扩展单元EU通过光纤向主AU传送IQ数据流，在主近端单元AU中，完成第二次合路相加，然后将上行信号发送到主近端单元AU或者从近端单元SAU1和SAU2的某一个通道发送到基站进行处理。所有机型之间IQ数据和控制信号的传输都是通过光纤完成的，上述两种DAS系统组网方式均可以应用在本申请的实施例中。
在该DAS系统中，系统能够传输的带宽是受光纤速率限制的，上下行IQ信号的数据流会根据信号的带宽大小放置在对应的位置上，并通过载波映射标志信号来区分每个上下行通道带宽大小和CPRI数据流上的位置信息。图3是根据本申请实施例的主近端单元AU上载波映射信息的示意图，如图3所示，IQ信号在数据压缩前以预设的位宽按照一定的规则拼接在一起，并放在一个载波容器中，其中，该预设的位宽可以为12bit，定义一个载波容器表示10M的信号带宽，根据信号带宽大小来确定该路IQ信号占用多少个载波容器，并在下面 对应位置用另外一组数据表示该载波容器，图3下一排0000表示AU通道B1的IQ信号的数据流，每一个格子表示1个载波容器，表示该路信号占用带宽为40M，类似的，AU通道B3的IQ信号的数据流信号占用带宽70M。图4是根据本申请实施例的远端单元RU的载波映射信息的示意图，如图4所示，在CPRI数据流的对应位置上放置40M的IQ信号，并用另一组数据表示该载波映射信息，图4下一排1111表示映射到RU射频通道RF1上。整个DAS系统的映射就是主近端单元AU上射频通道1的40M信号映射到RU1的射频通道2上，上下行信号就通过这些载波容器在对应位置上传送。同时，EU下级联的RU3也同样映射到主AU通道1上，在上行链路中，该通道的IQ信号的数据流会放置到载波容器的同样的位置中，这些RU的上行信号流在EU中就需要合路相加后传送回主AU，本方案中上行合路防溢出的功能可以在这个位置来完成。
在本申请的另一实施例中，图5是根据本申请实施例的一种上行链路合路求和方法的流程图，如图5所示，该方法包括如下步骤：
步骤S502，获取系统中主近端单元AU或者扩展单元EU通道的上行通用公共无线接口的CPRI数据流，对该CPRI数据流进行位宽扩展并全精度求和；由于通信系统中传输的二进制信号位宽都是固定的，这种情况下，多个二进制数求和就可能出现固定位宽不能正确表示求和的结果，导致出现溢出的情况。前述全精度求和就是根据求和的二进制个数，先对求和的二进制进行一定的高位符号位的扩展，再进行求和操作，从而避免数据溢出。
步骤S504，提取求和后该CPRI数据流中的正交IQ信号，确定占用单位带宽载波容器的该IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的该IQ信号的检测值，由该基准值和该检测值确定与该IQ信号快衰对应的衰减值，以及确定与该IQ信号慢放对应的衰减值；
该基准值的确定方法可以通过计算出该分布式天线系统传输的额定功率对应的IQ数值，将该IQ数值以1.5db的步进增大来生成一组用来获取快衰的第一基准值，用IQ数值小于1.5db的数值做慢放的第二基准值。另外确定预设时间段内占用单位带宽载波容器的该IQ信号的检测值可以在4us内确定占用单位带宽载波容器的该IQ信号的第二检测值，另外可以在30ms内确定占用单位带宽载波容器的该IQ信号的第三检测值。
步骤S506，获取该分布式天线系统的载波映射信息，依据该载波映射信息和该衰减值，生成与该CPRI数据对应的增益控制表，其中，该增益控制表中的该衰减值与该载波映射信息一一对应；
步骤S508，依据该增益控制表，对该CPRI数据流中该IQ信号进行移位，并按预设位宽截取移位后的该IQ信号。
通过上述方法，对该CPRI数据流进行位宽扩展并进行全精度求和；提取求和后该CPRI数据流中的正交IQ信号，确定IQ信号的基准值和检测值，从而确定与该IQ信号快衰慢放对应的衰减值，依据系统的该载波映射信息和该衰减值，生成与该CPRI数据对应的增益控制表，依据该增益控制表，对该CPRI数据流中该IQ信号进行移位，并按预设位宽截取该移位后的该IQ信号，解决了在分布式天线系统中，上行链路数字信号相加过程中，产生数字位宽部分溢出问题，该方案实现简单，功耗低。
在本申请的实施例中，根据该IQ信号的基准值和检测值，确定该IQ信号快衰的衰减值以及确定该IQ信号慢衰减值的方式有很多种，可以获取占用单位带宽的载波容器的该IQ信号的第一最大值，根据该第一最大值获取第一阈值时间范围内单位带宽的载波容器内每路该IQ信号的第二最大值，以此类推获取第二阈值时间内单位带宽载波容器的每路该IQ信号的第三最大值；计算出该分布式天线系统传输的额定功率对应的IQ数值，将该IQ数值以预设值的步进增大来生成一组用来获取快衰的第一基准值，该IQ数值小于预设值的情况下，该IQ数值用来做慢放的第二基准值，由该第二最大值确定第一检测值，由该第三最大值确定第二检测值；这里预设值可以包括但不限于以下之一：0.5db、1db、1.5db、2db和2.5db，优选的该预设值是1.5db。
上述IQ信号快衰对应的衰减值的确定方式可以有多种实现方式，例如可以将该第一检测值和该第一基准值从大到小依次进行比较，在该第一检测值大于该第一基准值的情况下，停止该比较，确定该检测值和该第一基准值比较结果，依据该比较结果确定该IQ信号快衰对应的衰减值，在该第一检测值小于该第一基准值的最小步进值的情况下，该IQ信号不做快衰处理；
上述IQ信号慢放对应的衰减值的确定方式可以有多种实现方式，例如将该第二检测值和该第二基准值的最低门限值进行比较，在该第二检测值低于该最低门限值的情况下，在该第二阈值时间后减小与单位步进值对应的衰减量，确定与该IQ信号慢放对应的衰减值，在该第二检测值大于该最低门限值，则不做慢放处理，上述确定快衰慢放的衰减值的方式，对上行链路合路信号中功率较小的链路的影响较小。
在本申请的另一个实施例中，图6是根据本申请实施例的一种上行链路求和溢出保护处理的流程图，如图6所示，该处理过程包括如下步骤：
步骤S602，在EU或者主近端单元AU中，对CPRI数据流通过位宽的扩展进行全精度的求和，如前面载波映射所述，接收传输到同一个主近端单元AU通道的上行数据流被放置在相同的位置，这样映射到相同主近端单元AU通道的CPRI数据流可以直接完成求和。在本实施例中，可以有最多8个光口的CPRI数据流在扩展单元EU和主近端单元AU进行求 和处理，因此需要将合路求和后的IQ信号位宽扩展4位，完成无失真的全精度求和。
步骤S604，在首先将单位带宽为10M的载波容器中的数据按照IQ信号现有的填充规则依次取出来，计算出绝对值，并找出其中的该第一最大值，接下来统计出第一阈值时间为4us范围内的10M载波容器中的第二最大值，用来做溢出保护的快速响应的第一检测值。这里可以不做信号功率的计算，换算出每1.5dbm功率时IQ信号的数值，设置以1.5为步进，最小0，最大衰减为21的第一基准值，将第一检测值与第一基准值从大到小依次比较，直到找到第一检测值比第一基准值大的时候停止，用4bit数值表示第一检测值比第一基准值大多少个步进，并将该值保存下来。如果第一检测值小于最小步进值，则不做快衰处理。统计第二阈值时间为30ms范围内的10M载波容器的第三最大值，用来做溢出保护的慢速回放增益的第二检测值，用这个第二检测值与第二基准值的最低门限值比较，如果低于最低门限值，就每30ms放出步进1.5的衰减值，如果这个第二检测值大于最低门限，则不做慢放处理。
步骤S606，获取该分布式天线系统的载波映射信息，依据该载波映射信息和该衰减值，生成与该CPRI数据对应的增益控制表，实施的过程为了实时处理12个上行通道的IQ信号的数据流，需要通过主AU下发整个DAS系统的全局载波映射信息，全局载波映射信息主要是需要知道主AU和两台从AU总共12个通道的载波映射信息，这里用0到11表示依次表示这12个通道，并与AU和RU的映射带宽相对应，根据载波容器存放12路CPRI数据流的工作机制，使用流水线处理方式，对每一帧中的12个IQ信号的数据流依次处理，下一帧的数据用同样的方式，简化了处理的过程，节省逻辑资源。图7是根据本申请实施例的一种增益控制表对应的载波映射信息的示意图，如图7所示，依次检测出每一路上行链路的保护处理值(快衰慢放的衰减值)，并且与载波映射信息一一对应，生成增益控制表(GAIN TABLE)信号流，其中，Gain0和Gain2为衰减值对应的增益值。
步骤S608，依据该增益控制表，对该CPRI数据流中该IQ信号进行移位，可以对该CPRI数据流中该IQ信号进行三级移位步进，该三级移位步进分别为6*N、3和1.5，其中，N为1、2或者3。具体的实施方法是，设置三级步进分别为6*N，3，1.5，三级步进用来做快衰的功能，依据输出的gain table信号按照载波映射信号依次排列，用4bit来表示，当高2bit数据不为0时，就按照1级步进6处理，根据这2bit的数值，衰减6的倍数，在IQ信号的数据处理过程中，对应将IQ信号进行补符号位右移1到3位，信号衰减6，12，18，同时低2bit的控制值表示将IQ信号衰减3或者1.5，第二bit为1表示衰减3，将一级步进处理后的IQ信号的数据分两部处理完成3的衰减，第一步补符号位右移一位加上补符号位右移三位，第二步将第一步的IQ信号的数据补符号为右移3位然后加上第一步的IQ信号的数据，完成步进3的衰减。最低bit位为1表示衰减1.5，处理过程仍然分两步完成，将二级步进处理后 的IQ信号的数据首先补符号位右移三位加上二级步进后的IQ信号的数据，第二步是将第一步的I Q数据补符号位右移1位和3位后相加，完成1.5步进的处理，移位处理完成后的信号按照一定的位宽截取出12bit的数据后，完成信号的防溢出功能。由于该方案是通过全局载波映射信息在CPRI数据流上按照流水线方式完成，因此处理后的IQ信号不用重新进行CPRI的组帧与载波映射，可以直接传送到CPRI帧中通过光纤传输，节省了解帧的处理，实现了系统的简单化。
在本实施例中，提供了一种上行链路合路求和装置，图8是根据本申请实施例的一种上行链路合路求和装置的结构示意图，如图8所示，该装置包括加法模块82(SUM模块)、检测模块84(DETECT模块)和增益模块86(GAINX模块)；
该加法模块82用于获取分布式天线系统中主近端单元AU或者扩展单元EU的通道的上行通用公共无线接口CPRI数据流，对该CPRI数据流进行位宽扩展并进行全精度求和；
该检测模块84用于提取求和后该CPRI数据流中的正交IQ信号，确定占用单位带宽载波容器的该IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的该IQ信号的检测值，由该基准值和该检测值确定与该IQ信号快衰对应的衰减值，以及确定与该IQ信号慢放对应的衰减值；
该检测模块84还用于获取该分布式天线系统的载波映射信息，依据该载波映射信息和该衰减值，生成与该CPRI数据对应的增益控制表，其中，该增益控制表中的该衰减值与该载波映射信息一一对应；
该增益模块86用于依据该增益控制表，对求和后该CPRI数据流中该IQ信号移位，并按预设位宽截取该移位后的该IQ信号。
通过上行链路合路求和装置，EU和主AU各个光路接收每个通道的上行CPRI数据流并在SUM模块中进行全精度的求和，求和后的数据进入GAINX模块，通过DETECT模块计算出的增益控制表(GAIN TABLE)按照载波映射信号依次排列，来实时调整合路求和后的CPRI数据流的IQ信号，完成上行合路防溢出功能，同时调整后的CPRI数据流作为输出传输到光纤，上述求和方案在EU和主AU中可以复用，解决了在分布式天线系统中，上行链路数字信号相加过程中，产生数字位宽部分溢出问题，该方案实现简单，功耗低。
在本实施例中，还提供了一种分布式天线系统，该系统包括：主近端单元AU、扩展单元EU和远端单元RU，其中，该AU连接该EU，该AU连接至少两个该RU，该EU连接至少两个该RU，该系统的上行链路的公共无线接口CPRI数据流通过该RU在该EU进行第一次合路相加，以及CPRI数据流通过该EU在该AU进行第二次合路相加，该第一次合路相加和该第二次合路相加的处理过程包括：
获取该AU或者该EU的上行链路通道的CPRI数据流，对该CPRI数据流进行位宽扩展并进行全精度求和；
提取求和后该CPRI数据流中的正交IQ信号，确定占用单位带宽载波容器的该IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的该IQ信号的检测值，由该基准值和该检测值确定与该IQ信号快衰对应的衰减值，以及确定与该IQ信号慢放对应的衰减值；
获取该分布式天线系统的载波映射信息，依据该载波映射信息和该衰减值，生成与该CPRI数据对应的增益控制表，其中，该增益控制表中的该衰减值与该载波映射信息一一对应；
依据该增益控制表，对该CPRI数据流中该IQ信号进行移位，并按预设位宽截取该移位后的该IQ信号。
通过上述系统，能够在AU或者EU中在CPRI数据流中对合路相加的信号做快速响应的位宽溢出保护，能够解决DAS上行链路合路求和过程中数字信号溢出的问题，该方案能够不使用FPGA的数字信号处理(Digital Signal Process，简称为DSP)资源，在较小的FPGA资源消耗下完成功能方案，实现简单，降低功耗，并且该方案能够减小对上行链路合路信号中功率较小的链路的影响。
在另外一个实施例中，还提供了一种软件，该软件用于执行上述实施例及优选实施例中描述的技术方案。
在另外一个实施例中，还提供了一种存储介质，该存储介质中存储有上述软件，该存储介质包括但不限于光盘、软盘、硬盘、可擦写存储器等。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程，是可以通过计算机程序来指令相关的硬件来完成，所述的计算机程序可存储于一非易失性计算机可读取存储介质中，该计算机程序在执行时，可包括如上述各方法的实施例的流程。其中，本申请所提供的各实施例中所使用的对存储器、存储、数据库或其它介质的任何引用，均可包括非易失性和/或易失性存储器。非易失性存储器可包括只读存储器(ROM)、可编程ROM(PROM)、电可编程ROM(EPROM)、电可擦除可编程ROM(EEPROM)或闪存。易失性存储器可包括随机存取存储器(RAM)或者外部高速缓冲存储器。作为说明而非局限，RAM以多种形式可得，诸如静态RAM(SRAM)、动态RAM(DRAM)、同步DRAM(SDRAM)、双数据率SDRAM(DDRSDRAM)、增强型SDRAM(ESDRAM)、同步链路(Synchlink)DRAM(SLDRAM)、存储器总线(Rambus)直接RAM(RDRAM)、直接存储器总线动态RAM
(DRDRAM)、以及存储器总线动态RAM(RDRAM)等。
以上实施例的各技术特征可以进行任意的组合，为使描述简洁，未对上述实施例中的各个技术特征所有可能的组合都进行描述，然而，只要这些技术特征的组合不存在矛盾，都应当认为是本说明书记载的范围。
以上所述实施例仅表达了本申请的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对发明专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本申请构思的前提下，还可以做出若干变形和改进，这些都属于本申请的保护范围。因此，本申请专利的保护范围应以所附权利要求为准。

Claims (10)

  1. 一种上行链路合路求和方法，其特征在于，所述方法包括：
    获取系统中主近端单元AU或者扩展单元EU通道的上行通用公共无线接口CPRI数据流，对所述CPRI数据流进行位宽扩展并进行全精度求和；
    提取求和后所述CPRI数据流中的正交IQ信号，确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定与所述IQ信号慢放对应的衰减值；
    获取所述系统的载波映射信息，依据所述载波映射信息和所述衰减值，生成与所述CPRI数据对应的增益控制表，其中，所述增益控制表中的所述衰减值与所述载波映射信息一一对应；
    依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行移位，并按预设位宽截取所述移位后的所述IQ信号。
  2. 根据权利要求1所述方法，其特征在于，所述确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定与所述IQ信号慢放对应的衰减值包括：
    获取占用单位带宽的载波容器的所述IQ信号的第一最大值，根据所述第一最大值获取第一阈值时间范围内单位带宽的载波容器内每路所述IQ信号的第二最大值，获取第二阈值时间内单位带宽载波容器的每路所述IQ信号的第三最大值；计算出所述分布式天线系统传输的额定功率对应的IQ数值，将所述IQ数值以预设值的步进增大来生成一组用来获取快衰的第一基准值，所述IQ数值小于所述预设值的情况下，所述IQ数值用来做慢放的第二基准值，由所述第二最大值确定第一检测值，由所述第三最大值确定第二检测值；
    依据所述第一基准值和所述第一检测值获取与所述IQ信号快衰对应的衰减值，依据所述第二基准值和所述第二检测值获取与所述IQ信号慢放对应的衰减值。
  3. 根据权利要求2所述方法，其特征在于，所述依据所述第一基准值和所述第一检测值获取与所述IQ信号快衰对应的衰减值，依据所述第二基准值和所述第二检测值获取与所述IQ信号慢放对应的衰减值包括：
    将所述第一检测值和所述第一基准值从大到小依次进行比较，在所述第一检测值大于所述第一基准值的情况下，停止所述比较，确定所述检测值和所述第一基准值比较结果，依据所述比较结果确定所述IQ信号快衰对应的衰减值，在所述第一检测值小于所述第一基准值的 最小步进值的情况下，所述IQ信号不做快衰处理；
    将所述第二检测值和所述第二基准值的最低门限值进行比较，在所述第二检测值低于所述最低门限值的情况下，在所述第二阈值时间后减小与单位步进值对应的衰减量，确定与所述IQ信号慢放对应的衰减值，在所述第二检测值大于所述最低门限值，则不做慢放处理。
  4. 根据权利要求2所述方法，其特征在于，所述预设值包括但不限于以下之一：0.5db、1db、1.5db、2db和2.5db。
  5. 根据权利要求1至4任一项所述方法，其特征在于，所述依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行移位包括：
    依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行三级移位步进，所述三级移位步进分别为6*N、3和1.5，其中，N为1、2或者3。
  6. 一种上行链路合路求和装置，其特征在于，所述装置包括加法模块、检测模块和增益模块；
    所述加法模块用于获取分布式天线系统中主近端单元AU或者扩展单元EU的通道的上行通用公共无线接口CPRI数据流，对所述CPRI数据流进行位宽扩展并进行全精度求和；
    所述检测模块用于提取求和后所述CPRI数据流中的正交IQ信号，确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定与所述IQ信号慢放对应的衰减值；所述检测模块还用于获取所述分布式天线系统的载波映射信息，依据所述载波映射信息和所述衰减值，生成与所述CPRI数据对应的增益控制表，其中，所述增益控制表中的所述衰减值与所述载波映射信息一一对应；
    所述增益模块用于依据所述增益控制表，对求和后所述CPRI数据流中所述IQ信号移位，并按预设位宽截取所述移位后的所述IQ信号。
  7. 根据权利要求6所述装置，其特征在于，所述增益模块用于依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行三级移位步进，所述三级移位步进分别为6*N、3和1.5，其中，N为1、2或者3。
  8. 一种分布式天线系统，其特征在于，所述系统包括：主近端单元AU、扩展单元EU和远端单元RU，其中，所述AU连接所述EU，所述AU连接至少两个所述RU，所述EU连接至少两个所述RU，该系统的上行链路的公共无线接口CPRI数据流通过所述RU在所述EU进行第一次合路相加，以及CPRI数据流通过所述EU在所述AU进行第二次合路相加，所述第一次合路相加和所述第二次合路相加的处理过程包括：
    获取所述AU或者所述EU的上行链路通道的CPRI数据流，对所述CPRI数据流进行位 宽扩展并进行全精度求和；
    提取求和后所述CPRI数据流中的正交IQ信号，确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定与所述IQ信号慢放对应的衰减值；
    获取所述分布式天线系统的载波映射信息，依据所述载波映射信息和所述衰减值，生成与所述CPRI数据对应的增益控制表，其中，所述增益控制表中的所述衰减值与所述载波映射信息一一对应；
    依据所述增益控制表，对所述CPRI数据流中所述IQ信号进行移位，并按预设位宽截取所述移位后的所述IQ信号。
  9. 根据权利要求8所述系统，其特征在于，所述确定占用单位带宽载波容器的所述IQ信号的基准值，以及确定预设时间段内占用单位带宽载波容器的所述IQ信号的检测值，由所述基准值和所述检测值确定与所述IQ信号快衰对应的衰减值，以及确定与所述IQ信号慢放对应的衰减值包括：
    获取占用单位带宽的载波容器的所述IQ信号的第一最大值，根据所述第一最大值获取第一阈值时间范围内单位带宽的载波容器内每路所述IQ信号的第二最大值，获取第二阈值时间内单位带宽载波容器的每路所述IQ信号的第三最大值；计算出所述分布式天线系统传输的额定功率对应的IQ数值，将所述IQ数值以1.5db的步进增大来生成一组用来获取快衰的第一基准值，所述IQ数值小于1.5db的数值用来做慢放的第二基准值，由所述第二最大值确定第一检测值，由所述第三最大值确定第二检测值；依据所述第一基准值和所述第一检测值获取与所述IQ信号快衰对应的衰减值，依据所述第二基准值和所述第二检测值获取与所述IQ信号慢放对应的衰减值。
  10. 根据权利要求9所述系统，其特征在于，所述依据所述第一基准值和所述第一检测值获取与所述IQ信号快衰对应的衰减值，依据所述二基准值和所述第二检测值获取与所述IQ信号慢放对应的衰减值包括：
    将所述第一检测值和所述第一基准值从大到小依次进行比较，在所述第一检测值大于所述第一基准值的情况下，停止所述比较，确定所述检测值和所述第一基准值比较结果，依据所述比较结果确定所述IQ信号快衰对应的衰减值，在所述第一检测值小于所述第一基准值的最小步进值的情况下，所述IQ信号不做快衰处理；
    将所述第二检测值和所述第二基准值的最低门限值进行比较，在所述第二检测值低于所述最低门限值的情况下，在所述第二阈值时间后减小与单位步进值对应的衰减量，确定与所 述IQ信号慢放对应的衰减值，在所述第二检测值大于所述最低门限值，则不做慢放处理。
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