WO2010082333A1 - Dispositif de station de base sans fil et procédé de compensation de retard - Google Patents

Dispositif de station de base sans fil et procédé de compensation de retard Download PDF

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Publication number
WO2010082333A1
WO2010082333A1 PCT/JP2009/050473 JP2009050473W WO2010082333A1 WO 2010082333 A1 WO2010082333 A1 WO 2010082333A1 JP 2009050473 W JP2009050473 W JP 2009050473W WO 2010082333 A1 WO2010082333 A1 WO 2010082333A1
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WO
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Prior art keywords
wireless device
delay correction
unit
control unit
radio
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PCT/JP2009/050473
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English (en)
Japanese (ja)
Inventor
修也 平田
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富士通株式会社
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Priority to PCT/JP2009/050473 priority Critical patent/WO2010082333A1/fr
Publication of WO2010082333A1 publication Critical patent/WO2010082333A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/004—Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045—Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/009—Closed loop measurements

Definitions

  • the present invention relates to a radio base station apparatus having a radio apparatus control unit and a plurality of radio apparatuses, and a delay correction method.
  • MBMS Multimedia Broadcast and Multicast Service
  • MBMS Multimedia Broadcast and Multicast Service
  • the radio base station device often takes a configuration separated into, for example, a radio device control unit and a radio device.
  • the size of the wireless device control unit tends to be large because it has a connection with the upper line and accommodates a plurality of sectors, and is often installed in a station building.
  • Wireless devices are often configured as independent devices for each sector, are small in size, and are installed directly under the antenna as much as possible to reduce cable loss to the antenna. Often done. In the case of installation on a pole, further downsizing is desired from the relationship with the load capacity.
  • CPRI Common Radio Radio Interface
  • Non-Patent Document 1 When the wireless device control unit and the wireless device are connected by an optical cable using CPRI, the transmission delay time between the wireless device control unit and the wireless device differs depending on the optical cable length. On the other hand, in order to align the timing of wireless device output as a wireless system, correction of delay time due to the difference in optical cable length may be performed. The method for measuring the delay time is described in Non-Patent Document 1.
  • the frame configuration when the Line Bit Rate is 2457.6 Mbps is shown in FIG.
  • the control word is determined to periodically transmit a synchronization byte, thereby enabling timing synchronization between the wireless device control unit and the wireless device.
  • FIG. 2 shows an overview of the CPRI protocol.
  • control data can be exchanged between the wireless device control unit and the wireless device using each field of Control & Management Plane, HDLC, Ethernet, and Vendor Specific.
  • FIG. 3 shows the definition of points related to delay measurement.
  • R1, R2, R3, R4, and Ra are defined as points for performing delay measurement.
  • the point R1 is an output terminal of the wireless device controller 1
  • the point R4 is an input terminal of the wireless device controller 1.
  • Point R2 is a CPRI interface side input terminal of the wireless device 2
  • point R3 is a CPRI interface side output terminal.
  • Point Ra is the input / output end of the antenna.
  • T14, T12, Toffset, T34, T2a, and T3a are defined as delay times between the points.
  • the delay time T14 is a time difference between the CPRI frame timing output from the wireless device controller output terminal R1 and the CPRI frame timing input to the wireless device controller input terminal R4.
  • the delay time T12 is a delay time from the wireless device control unit output terminal R1 to the wireless device input terminal R2.
  • the delay time Toffset is a delay time until the CPRI frame timing input from the wireless device input terminal R3 is output to the wireless device output terminal R4.
  • Delay time T34 is a delay time from the wireless device output terminal R3 to the wireless device control unit input terminal R4.
  • the delay time T2a is the delay time until the baseband signal input to the radio apparatus input terminal R2 is output to the antenna Ra
  • the delay time T3a is the time until the input of the antenna Ra is output to the radio apparatus output terminal R3. Delay time.
  • the delay time Toffset is a delay amount inside the wireless device, and can be regarded as a fixed value.
  • the delay times T2a and T3a are the sum of the amount of delay inside the wireless device and the amount of delay of the antenna cable. Since the length of the antenna cable is short, it is treated as an error or fixed from the cable length when laying the wireless device. By estimating the delay amount, it can be regarded as a fixed value.
  • Fig. 4 shows the relationship of CPRI frame timing.
  • the CPRI frame output from the wireless device control unit output terminal R1 is delayed by T12 before being received at the wireless device input terminal R2.
  • the wireless device generates an upstream CPRI frame from the received CPRI frame timing, and outputs it from the wireless device output terminal R3.
  • the internal delay is delayed by Toffset.
  • the CPRI frame output from the wireless device output terminal R3 is delayed by T34 before being received at the wireless device control unit input terminal R4.
  • the sum of these delay times (T12 + Toffset + T34) is equal to the time difference (T14) from when the CPRI frame is output from the wireless device controller output terminal R1 to when it is input to the wireless device controller input terminal R4. I understand.
  • T14 can be measured by the wireless device control unit 1.
  • Toffset is a fixed value, which is held as a fixed parameter in the wireless device control unit 1 or can be known by making an inquiry from the wireless device control unit 1 to the wireless device 2.
  • the cables for transmitting the downlink CPRI frame and the uplink CPRI frame are the same cable (for example, one-core bidirectional in the case of an optical cable)
  • T12 and T34 can be regarded as the same. From these, the time of T12 and T34 is computable from (1) Formula.
  • CPRI Specification V4.0 (Chapter 4.2.9, Chapter 6.1)
  • FIG. 5 shows the definition of points related to delay correction when there are two wireless devices.
  • the first wireless device 2-1 is defined as (1)
  • the second wireless device 2-2 is defined as (2).
  • FIG. 6 is a diagram showing the timing relationship of downstream signals.
  • the CPRI frame transmitted to the first wireless device 2-1 is delayed by T12 (1) before reaching the wireless device input terminal.
  • a delay time T2a (1) is delayed until the downlink baseband signal included in the CPRI frame is output from the antenna.
  • the CPRI frame sent to the second wireless device 2-2 is delayed by T12 (2) before reaching the wireless device input end.
  • the downlink baseband signal included in the CPRI frame is delayed by T2a (2) before being output from the antenna as a radio signal.
  • Tdelay_DL Tdelay_DL
  • Tdelay_DL T12 + T2a (2) Due to the difference in delay time, the radio signal frame timing at the antenna output terminal Ra (1) of the first radio apparatus 2-1 and the radio signal at the antenna output terminal of the second radio apparatus 2-2. It can be seen that the signal frame timing is shifted by Tadj_DL. That is, the baseband signal transmitted simultaneously by the wireless device control unit 1 is shifted by Tadj_DL at the antenna end.
  • FIG. 7 is a diagram showing the timing relationship of upstream signals. Radio signals received simultaneously by the respective antennas are delayed by T3a (1) and T34 (1) in the first radio apparatus 2-1, and T3a (2) and T34 (2) in the second radio apparatus 2-2. 2) Delay by. When the delay time from the antenna reception to the input terminal of the wireless device control unit 1 is Tdelay_UL, it can be expressed by the following equation.
  • Tdelay_UL T3a + T34 (3) Due to the difference between these delay times, the timing of radio signals received simultaneously by the antenna is shifted by Tadj_UL at the input end of the radio apparatus control unit 1.
  • the radio signal frame timing error Tadj_DL at the antenna output ends of the radio apparatuses 2-1 and 2-2 and the input terminals of the radio apparatus control unit 1 for the radio signals received simultaneously by the antennas is desirable that the timing error Tadj_UL is adjusted so as to be as small as possible.
  • one of the objects is made in view of the above points, and provides a radio base station apparatus and a delay correction method capable of performing highly accurate delay correction and reducing errors in transmission / reception timing between cells. It is to be.
  • control data is transmitted from the radio apparatus control unit to each radio apparatus, and the control is performed from each radio apparatus by the radio apparatus control unit.
  • a response to data is received, and the delay time from the transmission of control data to each wireless device by the wireless device controller until reception of the response is measured, so that the maximum delay time of each wireless device is obtained.
  • An uplink signal delay correction value and a downlink signal delay correction value to be added to the delay time of each radio device are obtained, and an uplink delay correction unit and a downlink delay provided in at least one of the radio device control unit and each radio device
  • the delay correction value for the upstream signal and the delay correction value for the downstream signal of each wireless device are set, and the delay time between the wireless device control unit and each of the plurality of wireless devices is constant.
  • FIG. 8 shows a configuration diagram of the first embodiment of the radio base station apparatus
  • FIG. 9 shows a sequence of delay correction processing in the first embodiment.
  • the delay correction process is executed by the wireless device control unit.
  • the radio base station apparatus has a radio apparatus control unit 10 and radio apparatuses 20-1 to 20-n.
  • the wireless device control unit 10 includes a plurality of interface units 11-1 to 11-n, a base station control unit 12, a baseband signal processing unit 13, and a line termination unit 14.
  • the interface units 11-1 to 11-n are connected to the interface units 21 of the plurality of radio apparatuses 20-1 to 20-n by optical cables.
  • the base station control unit 12 performs overall control of the radio device control unit 10 and the radio devices 20-1 to 20-n.
  • the baseband signal processing unit 13 distributes the line data supplied from the line terminating unit 14 to each interface unit 11-1 to 11-n and supplies it as a downlink baseband signal, and each interface unit 11-1 to 11-n.
  • the line data is extracted from the uplink baseband signal supplied from n and supplied to the line control unit 14.
  • the line control unit 14 is connected to a host device such as a base station control device.
  • Each of the wireless devices 20-1 to 20-n includes an interface unit 21 and a transmission / reception amplification unit 22.
  • the interface unit 21 is connected to one of the interface units 11-1 to 11-n of the wireless device control unit 10 by an optical cable.
  • the transmission / reception amplifier 22 supplies the uplink signal received and amplified by the antenna 23 to the interface unit 21, and amplifies the downlink signal supplied from the interface unit 21 and transmits it from the antenna 23.
  • the downlink delay correction value of the downlink delay correction unit 38 of the radio apparatus control unit 10 is Tadj_DL
  • the uplink delay correction value of the uplink delay correction unit 37 is Tadj_UL
  • the initial values of Tadj_DL and Tadj_UL are 0 and 0, respectively. To do.
  • the downlink signal processing unit 31 of the interface unit 11-1 of the wireless device control unit 10 performs control data and baseband signal processing generated by the IF control unit 36 of the interface unit 11-1 in accordance with an internal reference timing.
  • the downlink baseband signal sent from the unit 13 is synthesized, and the downlink CPRI frame shown in FIG. 1 is generated and output.
  • the CPRI frame control word periodically includes a synchronization byte.
  • the downlink signal processing unit 31 notifies the delay measurement unit 32 of the transmission timing.
  • the output downstream CPRI frame is transmitted from the S / P (serial / parallel) conversion unit 33 and the O / E (optical / electrical) conversion unit 34 of the wireless device control unit 10 to the wireless device 20-1 through an optical cable.
  • the signal is supplied to the downlink signal processing unit 43 through the O / E conversion unit 41 and the S / P conversion unit 42 in the interface unit 21 of the radio apparatus 20-1, and the downlink signal processing unit 43 controls the control data, the downlink baseband signal, and the like. Separated. Further, the downstream signal processing unit 43 extracts the timing at which the CPRI frame is received, and notifies the upstream signal processing unit 45 of the timing signal.
  • the uplink signal processing unit 45 combines the control data generated by the IF control unit 44 of the interface unit 21 and the uplink baseband signal sent from the transmission / reception amplification unit 22, and generates and outputs the uplink CPRI frame shown in FIG. To do. At this time, the upstream CPRI frame is output based on the timing signal notified from the downstream signal processing unit 43. Further, the control data includes fixed delay times Toffset, T2a, and T3a stored in advance in the memory 46. If the delay time information cannot be accommodated in a single CPRI frame, the delay time information is accommodated across a plurality of CPRI frames.
  • the upstream CPRI frame output from the upstream signal processing unit 45 is sent from the S / P conversion unit 42 in the interface unit 21 of the wireless device 20-1 and the interface unit 11 of the wireless device control unit 10 through the optical cable from the O / E conversion unit 41. Sent to -1.
  • the uplink CPRI frame is supplied to the uplink signal processing unit 35 through the O / E conversion unit 34 and the S / P conversion 33 in the interface unit 11-1, where it is separated into control data and an uplink baseband signal. This is notified to the IF control unit 36 and the baseband signal processing unit 13 of the unit 11-1.
  • This control data includes delay times Toffset, T2a, and T3a. Further, the upstream signal processing unit 35 extracts the timing at which the CPRI frame is received, and notifies the delay measuring unit 32 of the reception timing.
  • the portion surrounded by a broken line in FIG. 9 is shown paying attention to one CPRI frame, and is actually a repetition for each frame, and the control data is transmitted across a plurality of frames, for example. Further, the timing signal is transmitted every specific period.
  • the delay measurement unit 32 measures the delay time T14 from the transmission timing notified from the downlink signal processing unit 31 and the reception timing extracted by the uplink signal processing unit 35, and notifies the IF control unit 36 of the result.
  • the IF control unit 36 notifies the base station control unit 12 of the notified delay time T14 and the delay times Toffset, T2a, and T3a notified by the control data.
  • the base station control unit 12 calculates delay times Tdelay_DL and Tdelay_UL using these pieces of information, and calculates delay correction values Tadj_DL and Tadj_UL.
  • FIG. 10 shows a flowchart of processing for calculating the delay times Tdelay_DL and Tdelay_UL executed by the base station control unit 12.
  • 1 is set to a variable i in step S1
  • delay times T12 and T34 are calculated from equation (1) in step S2.
  • steps S3 and S4 delay times Tdelay_DL and Tdelay_UL are calculated from equations (2) and (3).
  • step S5 the variable i is compared with the number n of wireless devices connected to the wireless device control unit 10. If i ⁇ n, the variable i is incremented by 1 in step S6, and the process proceeds to step S2. S4 is repeated for the number n of wireless devices.
  • FIG. 11 shows a flowchart of delay correction value calculation processing executed by the base station control unit 12.
  • the maximum values of Tdelay_DL and Tdelay_UL corresponding to each wireless device are calculated as Tdelay_DL_MAX and Tdelay_UL_MAX, respectively.
  • xx DL
  • xx UL
  • step S11 1 is set to the variable i, and the initial values of Tdelay_DL_MAX and Tdelay_UL_MAX are set to 0.
  • step S12 the values of Tdelay_DL_MAX and Tdelay_UL_MAX are compared with Tdelay_DL (i) and Tdelay_UL (i) corresponding to each wireless device. If Tdelay_DL (i) and Tdelay_UL (i) are larger, Tdelay_DL_MAX in step S13. Replace Tdelay_UL_MAX.
  • step S14 the variable i is compared with the number n of wireless devices connected to the wireless device control unit 10. If i ⁇ n, the variable i is incremented by 1 in step S15 and the process proceeds to step S12. S13 is repeated for the number n of wireless devices.
  • step S17 the difference between Tdelay_DL_MAX and Tdelay_UL_MAX, which are the maximum values of Tdelay_DL and Tdelay_UL, and Tdelay_DL (i) and Tdelay_UL (i) corresponding to each wireless device is calculated and set to Tadj_DL (i) and Tadj_UL (i).
  • step S18 the variable i is compared with the number n of wireless devices connected to the wireless device control unit 10. If i ⁇ n, the variable i is incremented by 1 in step S19 and the process proceeds to step S17. Repeat for a number n of wireless devices.
  • the delay correction values Tadj_DL and Tadj_UL calculated in this way are notified from the base station control unit 12 to the IF control unit 36, and further notified to the downlink delay correction unit 38 and the uplink delay correction unit 37.
  • the downlink delay correction unit 38 and the uplink delay correction unit 37 delay the data of the downlink baseband signal and the uplink baseband signal according to the notified delay correction values Tadj_DL and Tadj_UL, so that the radio frame between the radio apparatuses is delayed. Timing can be matched.
  • FIG. 12 shows the timing relationship of the downlink signal when the delay correction processing is performed
  • FIG. 13 shows the timing relationship of the uplink signal when the delay correction processing is performed.
  • the point definition regarding delay correction in the case where there are two wireless devices is used, (1) relating to the first wireless device, (1) relating to the second wireless device ( 2).
  • the final downlink transmission timing error is defined as Error_DL
  • the uplink reception timing error is defined as Error_UL.
  • the delay amount in the wireless device control unit 10 is ideally zero.
  • the delay correction of the uplink signal is a process closed in the radio apparatus controller 10, the delay correction can be performed with the accuracy of the internal clock with respect to Tadj_UL.
  • the downlink signal processing unit 31 generates a CPRI frame in units of one chip (260.42 ns) in accordance with the CPRI specification, and therefore delay correction is performed in units of one chip for Tadj_DL.
  • FIG. 14 shows a configuration diagram of the second embodiment of the radio base station apparatus
  • FIG. 15 shows a sequence of delay correction processing in the second embodiment.
  • the process until the base station control unit 12 calculates the delay correction values Tadj_DL (i) and Tadj_UL (i) corresponding to the radio apparatuses 20-1 to 20-n is the same as that of the first embodiment.
  • the delay correction processing of the upstream signal and downstream signal is executed by the wireless device.
  • the downlink delay correction value of the downlink delay correction unit 48 of the radio apparatus 20-1 is Tadj_DL
  • the uplink delay correction value of the uplink delay correction unit 47 is Tadj_UL.
  • the initial values are 0 respectively.
  • the downlink signal processing unit 31 of the interface unit 11-1 of the wireless device control unit 10 performs control data and baseband signal processing generated by the IF control unit 36 of the interface unit 11-1 in accordance with an internal reference timing.
  • the downlink baseband signal sent from the unit 13 is synthesized, and the downlink CPRI frame shown in FIG. 1 is generated and output.
  • the CPRI frame control word periodically includes a synchronization byte.
  • the downlink signal processing unit 31 notifies the delay measurement unit 32 of the transmission timing.
  • the output downlink CPRI frame is transmitted from the S / P conversion unit 33 and the O / E conversion unit 34 of the wireless device control unit 10 to the wireless device 20-1 through an optical cable.
  • the signal is supplied to the downlink signal processing unit 43 through the O / E conversion unit 41 and the S / P conversion unit 42 in the interface unit 21 of the radio apparatus 20-1, and the downlink signal processing unit 43 controls the control data, the downlink baseband signal, and the like. Separated. Further, the downstream signal processing unit 43 extracts the timing at which the CPRI frame is received, and notifies the upstream signal processing unit 45 of the timing signal.
  • the uplink signal processing unit 45 combines the control data generated by the IF control unit 44 of the interface unit 21 and the uplink baseband signal sent from the transmission / reception amplification unit 22, and generates and outputs the uplink CPRI frame shown in FIG. To do. At this time, the upstream CPRI frame is output based on the timing signal notified from the downstream signal processing unit 43. Further, the control data includes fixed delay times Toffset, T2a, and T3a stored in advance in the memory 46. If the delay time information cannot be accommodated in a single CPRI frame, the delay time information is accommodated across a plurality of CPRI frames.
  • the upstream CPRI frame output from the upstream signal processing unit 45 is sent from the S / P conversion unit 42 in the interface unit 21 of the wireless device 20-1 and the interface unit 11 of the wireless device control unit 10 through the optical cable from the O / E conversion unit 41. Sent to -1.
  • the uplink CPRI frame is supplied to the uplink signal processing unit 35 through the O / E conversion unit 34 and the S / P conversion 33 in the interface unit 11-1, where it is separated into control data and an uplink baseband signal. This is notified to the IF control unit 36 and the baseband signal processing unit 13 of the unit 11-1.
  • This control data includes delay times Toffset, T2a, and T3a. Further, the upstream signal processing unit 35 extracts the timing at which the CPRI frame is received, and notifies the delay measuring unit 32 of the reception timing.
  • the portion surrounded by a broken line in FIG. 15 is shown paying attention to one CPRI frame, and is actually a repetition for each frame, and the control data is transmitted across a plurality of frames, for example. Further, the timing signal is transmitted every specific period.
  • the delay measurement unit 32 measures the delay time T14 from the transmission timing notified from the downlink signal processing unit 31 and the reception timing extracted by the uplink signal processing unit 35, and notifies the IF control unit 36 of the result.
  • the IF control unit 36 notifies the base station control unit 12 of the notified delay time T14 and the delay times Toffset, T2a, and T3a notified by the control data.
  • the base station control unit 12 calculates delay times Tdelay_DL and Tdelay_UL using these pieces of information, and calculates delay correction values Tadj_DL and Tadj_UL.
  • the delay correction values Tadj_DL and Tadj_UL calculated in this way are notified from the base station control unit 12 to the IF control unit 36.
  • the downlink signal processing unit 31 combines the control data including the delay correction values Tadj_DL and Tadj_UL generated by the IF control unit 36 and the downlink baseband signal sent from the baseband signal processing unit 13 to generate and output a CPRI frame. .
  • Tadj_DL and Tadj_UL cannot be accommodated in a single CPRI frame, they are accommodated across a plurality of CPRI frames.
  • the output downlink CPRI frame is transmitted from the S / P conversion unit 33 and the O / E conversion unit 34 of the wireless device control unit 10 to the wireless device 20-1 through an optical cable.
  • the signal is supplied to the downlink signal processing unit 43 through the O / E conversion unit 41 and the S / P conversion unit 42 in the interface unit 21 of the radio apparatus 20-1, and the downlink signal processing unit 43 controls the control data, the downlink baseband signal, and the like. Separated.
  • the separated control data is supplied to the IF control unit 44 of 20-1.
  • This control data includes Tadj_DL and Tadj_UL.
  • the IF control unit 44 notifies the notified Tad_DL and Tadj_UL to the downlink delay correcting unit 48 and the uplink delay correcting unit 47.
  • the downlink delay correction unit 48 and the uplink delay correction unit 47 delay the data of the downlink baseband signal and the uplink baseband signal according to the notified delay correction values Tadj_DL and Tadj_UL, so that the radio frame between the radio apparatuses is delayed. Timing can be matched.
  • FIG. 16 shows the timing relationship of the downlink signal when the delay correction processing is performed
  • FIG. 17 shows the timing relationship of the uplink signal when the delay correction processing is performed.
  • the point definition regarding delay correction in the case where there are two wireless devices is used, (1) relating to the first wireless device, (1) relating to the second wireless device ( 2).
  • the final downlink transmission timing error is defined as Error_DL
  • the uplink reception timing error is defined as Error_UL. Note that the delay amount in the wireless device control unit 10 is ideally zero.
  • the downstream signal is a process closed in the radio apparatus 20-1
  • delay correction can be performed with accuracy of the internal clock with respect to Tadj_DL.
  • the uplink signal delay correction is performed in units of one chip for Tadj_UL because the uplink signal processing unit 45 generates a CPRI frame in units of one chip (260.42 ns) in accordance with the CPRI specification.
  • FIG. 18 shows a configuration diagram of a third embodiment of the radio base station apparatus
  • FIG. 19 shows a sequence of delay correction processing in the third embodiment.
  • the processing until the base station control unit 12 calculates the delay correction values Tadj_DL (i) and Tadj_UL (i) corresponding to the radio apparatuses 20-1 to 20-n is the same as that of the first embodiment.
  • the uplink signal delay correction processing is executed by the wireless device control unit 10
  • the downlink signal delay correction processing is executed by the wireless devices 20-1 to 20-n.
  • the downlink delay correction value of the downlink delay correction unit 48 of the radio apparatus 20-1 is Tadj_DL
  • the uplink delay correction value of the uplink delay correction unit 37 of the radio apparatus control unit 10 is Tadj_UL.
  • the initial values are 0 respectively.
  • the downlink signal processing unit 31 of the interface unit 11-1 of the wireless device control unit 10 performs control data and baseband signal processing generated by the IF control unit 36 of the interface unit 11-1 in accordance with an internal reference timing.
  • the downlink baseband signal sent from the unit 13 is synthesized, and the downlink CPRI frame shown in FIG. 1 is generated and output.
  • the CPRI frame control word periodically includes a synchronization byte.
  • the downlink signal processing unit 31 notifies the delay measurement unit 32 of the transmission timing.
  • the output downlink CPRI frame is transmitted from the S / P conversion unit 33 and the O / E conversion unit 34 of the wireless device control unit 10 to the wireless device 20-1 through an optical cable.
  • the signal is supplied to the downlink signal processing unit 43 through the O / E conversion unit 41 and the S / P conversion unit 42 in the interface unit 21 of the radio apparatus 20-1, and the downlink signal processing unit 43 controls the control data, the downlink baseband signal, and the like. Separated. Further, the downstream signal processing unit 43 extracts the timing at which the CPRI frame is received, and notifies the upstream signal processing unit 45 of the timing signal.
  • the uplink signal processing unit 45 combines the control data generated by the IF control unit 44 of the interface unit 21 and the uplink baseband signal sent from the transmission / reception amplification unit 22, and generates and outputs the uplink CPRI frame shown in FIG. To do. At this time, the upstream CPRI frame is output based on the timing signal notified from the downstream signal processing unit 43. Further, the control data includes fixed delay times Toffset, T2a, and T3a stored in advance in the memory 46. If the delay time information cannot be accommodated in a single CPRI frame, the delay time information is accommodated across a plurality of CPRI frames.
  • the upstream CPRI frame output from the upstream signal processing unit 45 is sent from the S / P conversion unit 42 in the interface unit 21 of the wireless device 20-1 and the interface unit 11 of the wireless device control unit 10 through the optical cable from the O / E conversion unit 41. Sent to -1.
  • the uplink CPRI frame is supplied to the uplink signal processing unit 35 through the O / E conversion unit 34 and the S / P conversion 33 in the interface unit 11-1, where it is separated into control data and an uplink baseband signal. This is notified to the IF control unit 36 and the baseband signal processing unit 13 of the unit 11-1.
  • This control data includes delay times Toffset, T2a, and T3a. Further, the upstream signal processing unit 35 extracts the timing at which the CPRI frame is received, and notifies the delay measuring unit 32 of the reception timing.
  • the portion surrounded by a broken line in FIG. 19 is shown paying attention to one CPRI frame, and is actually a repetition for each frame, and the control data is transmitted across a plurality of frames, for example. Further, the timing signal is transmitted every specific period.
  • the delay measurement unit 32 measures the delay time T14 from the transmission timing notified from the downlink signal processing unit 31 and the reception timing extracted by the uplink signal processing unit 35, and notifies the IF control unit 36 of the result.
  • the IF control unit 36 notifies the base station control unit 12 of the notified delay time T14 and the delay times Toffset, T2a, and T3a notified by the control data.
  • the base station control unit 12 calculates delay times Tdelay_DL and Tdelay_UL using these pieces of information, and calculates delay correction values Tadj_DL and Tadj_UL.
  • the delay correction values Tadj_DL and Tadj_UL calculated in this way are notified from the base station control unit 12 to the IF control unit 36.
  • the delay correction value Tadj_UL is notified from the IF control unit 36 to the uplink delay correction unit 37.
  • the downlink signal processing unit 31 combines the control data including the delay correction value Tadj_DL generated by the IF control unit 36 and the downlink baseband signal sent from the baseband signal processing unit 13 to generate and output a CPRI frame. At this time, if Tadj_DL cannot be accommodated in a single CPRI frame, it is accommodated across a plurality of CPRI frames.
  • the output downlink CPRI frame is transmitted from the S / P conversion unit 33 and the O / E conversion unit 34 of the wireless device control unit 10 to the wireless device 20-1 through an optical cable.
  • the signal is supplied to the downlink signal processing unit 43 through the O / E conversion unit 41 and the S / P conversion unit 42 in the interface unit 21 of the radio apparatus 20-1, and the downlink signal processing unit 43 controls the control data, the downlink baseband signal, and the like. Separated.
  • the separated control data is supplied to the IF control unit 44 of 20-1.
  • This control data includes Tadj_DL.
  • the IF control unit 44 notifies the notified Tad_DL to the downlink delay correction unit 48.
  • the downlink delay correction unit 48 can match the timing of the radio frame of the downlink baseband signal between the wireless devices by delaying the data of the downlink baseband signal according to the notified delay correction value Tadj_DL.
  • the uplink delay correction unit 37 of the radio apparatus control unit 10 delays the data of the uplink baseband signal according to the notified delay correction value Tadj_UL, so that the radio frame of the uplink baseband signal between the radio apparatuses is delayed. Timing can be matched.
  • the timing relationship of the downlink signal and the timing relationship of the uplink signal when the delay correction process is performed are as shown in FIGS.
  • the upstream signal is a process closed in the wireless device control unit 10 and the downstream signal is a process closed in the wireless device 20-1, so that both Tadj_UL and Tadj_DL perform delay correction with the accuracy of the internal clock. It becomes possible.
  • FIG. 20 shows a configuration diagram of a fourth embodiment of the radio base station apparatus
  • FIG. 21 shows a sequence of delay correction processing in the fourth embodiment.
  • the processing until the base station control unit 12 calculates the delay correction values Tadj_DL (i) and Tadj_UL (i) corresponding to the radio apparatuses 20-1 to 20-n is the same as that in the first embodiment.
  • the delay correction processing for the uplink signal is executed by the wireless device control unit 10
  • the delay correction processing for the downlink signal is performed by the wireless device control unit 10 for delay correction in units of one chip. It is executed by the wireless devices 20-1 to 20-n.
  • the downlink delay correction values of the downlink delay correction unit 38 of the wireless device control unit 10 and the downlink delay correction unit 48 of the wireless device 20-1 are Tadj_DL, and the uplink delay correction unit of the wireless device control unit 10
  • the upstream delay correction value of 37 is Tadj_UL.
  • the initial values are 0 respectively.
  • the downlink signal processing unit 31 of the interface unit 11-1 of the wireless device control unit 10 performs control data and baseband signal processing generated by the IF control unit 36 of the interface unit 11-1 in accordance with an internal reference timing.
  • the downlink baseband signal sent from the unit 13 is synthesized, and the downlink CPRI frame shown in FIG. 1 is generated and output.
  • the CPRI frame control word periodically includes a synchronization byte.
  • the downlink signal processing unit 31 notifies the delay measurement unit 32 of the transmission timing.
  • the output downlink CPRI frame is transmitted from the S / P conversion unit 33 and the O / E conversion unit 34 of the wireless device control unit 10 to the wireless device 20-1 through an optical cable.
  • the signal is supplied to the downlink signal processing unit 43 through the O / E conversion unit 41 and the S / P conversion unit 42 in the interface unit 21 of the radio apparatus 20-1, and the downlink signal processing unit 43 controls the control data, the downlink baseband signal, and the like. Separated. Further, the downstream signal processing unit 43 extracts the timing at which the CPRI frame is received, and notifies the upstream signal processing unit 45 of the timing signal.
  • the uplink signal processing unit 45 combines the control data generated by the IF control unit 44 of the interface unit 21 and the uplink baseband signal sent from the transmission / reception amplification unit 22, and generates and outputs the uplink CPRI frame shown in FIG. To do. At this time, the upstream CPRI frame is output based on the timing signal notified from the downstream signal processing unit 43. Further, the control data includes fixed delay times Toffset, T2a, and T3a stored in advance in the memory 46. If the delay time information cannot be accommodated in a single CPRI frame, the delay time information is accommodated across a plurality of CPRI frames.
  • the upstream CPRI frame output from the upstream signal processing unit 45 is sent from the S / P conversion unit 42 in the interface unit 21 of the wireless device 20-1 and the interface unit 11 of the wireless device control unit 10 through the optical cable from the O / E conversion unit 41. Sent to -1.
  • the uplink CPRI frame is supplied to the uplink signal processing unit 35 through the O / E conversion unit 34 and the S / P conversion 33 in the interface unit 11-1, where it is separated into control data and an uplink baseband signal. This is notified to the IF control unit 36 and the baseband signal processing unit 13 of the unit 11-1.
  • This control data includes delay times Toffset, T2a, and T3a. Further, the upstream signal processing unit 35 extracts the timing at which the CPRI frame is received, and notifies the delay measuring unit 32 of the reception timing.
  • the portion surrounded by a broken line in FIG. 21 is shown paying attention to one CPRI frame, and is actually a repetition for each frame, and the control data is transmitted across a plurality of frames, for example. Further, the timing signal is transmitted every specific period.
  • the delay measurement unit 32 measures the delay time T14 from the transmission timing notified from the downlink signal processing unit 31 and the reception timing extracted by the uplink signal processing unit 35, and notifies the IF control unit 36 of the result.
  • the IF control unit 36 notifies the base station control unit 12 of the notified delay time T14 and the delay times Toffset, T2a, and T3a notified by the control data.
  • the base station control unit 12 calculates delay times Tdelay_DL and Tdelay_UL using these pieces of information, and calculates delay correction values Tadj_DL and Tadj_UL.
  • the downlink delay correction value Tadj_DL is divided into a delay correction value Tadj_DL_a of the radio apparatus controller 10 that corrects in units of one chip and a delay correction value Tadj_DL_b of the radio apparatus that corrects a value of 1 chip or less.
  • FIG. 22 shows a flowchart of the delay correction value dividing process executed by the base station control unit 12.
  • 1 is set to the variable i.
  • the delay correction value Tadj_DL_a for each chip is obtained by truncating the decimal part of Tadj_DL, and the delay correction value Tadj_DL_b for one chip or less is obtained by extracting only the value after the decimal point of Tadj_DL.
  • step S23 the variable i is compared with the number n of wireless devices connected to the wireless device control unit 10. If i ⁇ n, the variable i is incremented by 1 in step S24, and the process proceeds to step S22. Step S22 is repeated for the number n of wireless devices.
  • the delay correction values Tadj_DL_a, Tadj_DL_b, and Tadj_UL calculated in this way are notified from the base station control unit 12 to the IF control unit 36.
  • the delay correction values Tadj_DL_a and Tadj_UL are notified from the IF control unit 36 to the downlink delay correction unit 38 and the uplink delay correction unit 37 of the wireless device control unit 10.
  • the downlink signal processing unit 31 combines the control data including Tadj_DL_b generated by the IF control unit 36 and the downlink baseband signal sent from the baseband signal processing unit 13 to generate and output a CPRI frame. At this time, if Tadj_DL_b cannot be accommodated in a single CPRI frame, it is accommodated across a plurality of CPRI frames.
  • the output downlink CPRI frame is transmitted from the S / P conversion unit 33 and the O / E conversion unit 34 of the wireless device control unit 10 to the wireless device 20-1 through an optical cable.
  • the signal is supplied to the downlink signal processing unit 43 through the O / E conversion unit 41 and the S / P conversion unit 42 in the interface unit 21 of the radio apparatus 20-1, and the downlink signal processing unit 43 controls the control data, the downlink baseband signal, and the like. Separated.
  • the separated control data is supplied to the IF control unit 44 of 20-1.
  • This control data includes Tadj_DL_b.
  • the IF control unit 44 notifies the notified Tad_DL_b to the downlink delay correction unit 48.
  • the uplink delay correction unit 37 of the wireless device control unit 10 delays the data of the uplink baseband signal according to the notified delay correction value Tadj_UL, so that the timing of the wireless frame between the wireless devices can be determined with the accuracy of the internal clock. Can be matched.
  • the downlink delay correction unit 38 of the wireless device control unit 10 delays the data of the uplink baseband signal according to the notified delay correction value Tadj_DL_a, thereby matching the timings of the wireless frames between the wireless devices in units of one chip.
  • the downlink delay correction unit 48 of the radio apparatus 20-1 delays the data of the downlink baseband signal according to the notified delay correction value Tadj_DL_b, thereby changing the timing of the radio frame between the radio apparatuses to the internal clock. Can be matched with accuracy.
  • FIG. 23 shows the timing relationship of the downlink signal when the delay correction process is performed.
  • the timing relationship of the upstream signal when the delay correction process is performed is as shown in FIG.
  • the delay correction can be performed with the accuracy of the internal clock with respect to the delay correction value Tadj_UL.
  • the delay correction value Tadj_DL_a is corrected by the radio device control unit 10 in units of one chip
  • the delay correction value Tadj_DL_b is corrected by delay of one chip or less by the radio device 20-1. The timing can be adjusted with the internal clock accuracy.
  • the wireless device control unit 10 has a buffer for correcting a delay of 150 ⁇ sec (576 chips), and the wireless devices 20-1 to 20-n One buffer is sufficient for the buffer. According to this embodiment, it is possible to improve the accuracy of delay correction while maintaining the miniaturization of the radio apparatuses 20-1 to 20-n.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

Dans un procédé de compensation de retard pour un dispositif de station de base sans fil comportant une unité de commande de dispositifs sans fil et une pluralité de dispositifs sans fil, l'unité de commande de dispositifs sans fil transmet des données de commande à chacun des dispositifs sans fil et reçoit la réponse aux données de commande provenant de chacun des dispositifs sans fil. L'unité de commande de dispositifs sans fil mesure le temps de retard entre la transmission de données de commande vers chacun des dispositifs sans fil et la réception de la réponse provenant de ceux-ci, obtient une valeur de compensation de retard d'un signal de liaison montante et la valeur de compensation de retard d'un signal de liaison descendante, qui sont ajoutées au temps de retard de chacun des dispositifs sans fil de telle sorte que le temps de retard de chacun des dispositifs sans fil devient le maximum, et règle les valeurs de compensation de retard des signaux de liaison montante et de liaison descendante de chacun des dispositifs sans fil à une section de compensation de retard de liaison montante et à une section de compensation de retard de liaison descendante disposées dans au moins l'un parmi l'unité de commande de dispositifs sans fil ou chacun des dispositifs sans fil pour rendre le temps de retard entre l'unité de commande de dispositifs sans fil et chacun des dispositifs sans fil constant.
PCT/JP2009/050473 2009-01-15 2009-01-15 Dispositif de station de base sans fil et procédé de compensation de retard WO2010082333A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012199718A (ja) * 2011-03-18 2012-10-18 Fujitsu Ltd 無線制御装置および無線制御方法

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Publication number Priority date Publication date Assignee Title
JP2007507957A (ja) * 2003-09-30 2007-03-29 テレフオンアクチーボラゲット　エル　エム　エリクソン（パブル） 無線基地局における無線装置コントローラノードと遠隔無線装置ノードとの間での通信インタフェース、通信装置、ならびに通信方法
JP2008516503A (ja) * 2004-10-12 2008-05-15 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 無線装置制御ノードと複数のリモートの無線装置ノードとの間の通信

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007507957A (ja) * 2003-09-30 2007-03-29 テレフオンアクチーボラゲット　エル　エム　エリクソン（パブル） 無線基地局における無線装置コントローラノードと遠隔無線装置ノードとの間での通信インタフェース、通信装置、ならびに通信方法
JP2008516503A (ja) * 2004-10-12 2008-05-15 テレフオンアクチーボラゲット エル エム エリクソン（パブル） 無線装置制御ノードと複数のリモートの無線装置ノードとの間の通信

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012199718A (ja) * 2011-03-18 2012-10-18 Fujitsu Ltd 無線制御装置および無線制御方法

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