WO2017071276A1 - 中继系统的空口时间同步方法、设备 - Google Patents

中继系统的空口时间同步方法、设备 Download PDF

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Publication number
WO2017071276A1
WO2017071276A1 PCT/CN2016/088026 CN2016088026W WO2017071276A1 WO 2017071276 A1 WO2017071276 A1 WO 2017071276A1 CN 2016088026 W CN2016088026 W CN 2016088026W WO 2017071276 A1 WO2017071276 A1 WO 2017071276A1
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Prior art keywords
data frame
value
base station
time value
module
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PCT/CN2016/088026
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English (en)
French (fr)
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钟毅
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华为技术有限公司
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Publication of WO2017071276A1 publication Critical patent/WO2017071276A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to an air interface time synchronization method and device for a relay system.
  • the relay technology is one of the main technologies of the Long Term Evolution Advanced (LTE-A) system, through a "host base station (for example, Donor eNB, DeNB) and a relay device (for example, Relay User Equipment) , RUE) provides a wireless transmission channel for the remote base station (for example, Remote Base Transceiver Station, ReBTS), which solves the problem that some stations do not have a legacy system bearer network.
  • LTE-A Long Term Evolution Advanced
  • RUE Relay User Equipment
  • FIG. 1 is a structural diagram of an existing LTE-A system. As shown in FIG. 1, the system includes: a DeNB, a RUE, and a ReBTS, wherein the DeNB and the RUE are connected by a wireless connection, and the RUE and the ReBTS are connected by a DeNB.
  • the downlink data is first transmitted to the relay device RUE, and then transmitted by the RUE to the ReBTS, and the ReBTS transmits the downlink data to the terminal user, thus narrowing the distance between the antenna and the terminal user, thereby improving the link quality of the terminal, thereby Improve the system's spectral efficiency and user data rate.
  • ReBTS uses satellite GPS clock source for time synchronization. As shown in Figure 1, ReBTS is directly connected to the Global Positioning System (GPS) to obtain accurate time. However, GPS is useless for indoor equipment and has strict restrictions on the installation location.
  • GPS Global Positioning System
  • the present invention provides an air interface time of a 3GPP Relay system. Synchronization method and device to solve the problem of installation location limitation caused by GPS time synchronization in the existing relay system.
  • an embodiment of the present invention provides a method for performing an air interface time synchronization of a relay system, where the method is applicable to a relay system including a host base station, a relay device, and a remote base station, where the method is:
  • the relay device Receiving, by the relay device, the first data frame sent by the host base station, where the first data frame includes: a system frame number of the second data frame, a subframe number of the second data frame, and the second An absolute time value of a start position of the data frame;
  • the second data frame is a data frame sent by the host base station after the first data frame;
  • the absolute time value of the start position of the second data frame is synchronized; according to the synchronized time value, at least one far
  • the terminal base station performs clock timing.
  • the relay device performs timing for the remote base station, thereby avoiding the problem of installation location limitation caused by GPS synchronization in the existing LTE-A relay system.
  • the absolute time value is a whole second value
  • the relay device can synchronize the absolute time value by the following manner, and grant the time to the remote base station according to the synchronized time value:
  • the number of received system subframe pulses is the N
  • triggering reading the whole second value and updating the whole second value currently stored by the relay device with the whole second value, and simultaneously After the nanosecond value currently stored by the device is cleared, and the nanosecond count is performed, the combination of the whole second value and the nanosecond value after the nanosecond count is determined as the time value after synchronizing the absolute time value;
  • the at least one remote base station is clocked by a protocol packet that is exchanged with the at least one remote base station, where the protocol packet carries: The time value after the absolute time value is synchronized.
  • the embodiment of the present invention further provides a relay device for performing the foregoing method, which is included in a relay system including a host base station and a remote base station, where the relay device includes:
  • a receiving unit configured to receive a first data frame that is sent by the host base station, where the first data frame includes: a system frame number of the second data frame, a subframe number of the second data frame, and the An absolute time value of a start position of the second data frame; the second data frame is a data frame sent by the host base station after the first data frame;
  • a synchronization unit configured to synchronize an absolute time value of a start position of the second data frame according to the number of subframes in which the first data frame and the second data frame are different;
  • the timing unit is configured to clock the at least one remote base station according to the synchronized time value.
  • the absolute time value is a whole second value
  • the synchronization unit can be used to:
  • the number of received system subframe pulses is the N
  • reading the whole second value updating the whole second value in the relay device with the whole second value, and simultaneously using the relay device
  • the nanosecond value in the middle is cleared, and the nanosecond count is performed, and the combination of the whole second value and the nanosecond value after the nanosecond count is determined as the time value after synchronizing the absolute time value.
  • the timing unit can be specifically used to:
  • the at least one remote base station is clocked by a protocol packet that is exchanged with the at least one remote base station, where the protocol packet carries: a time value after synchronizing the absolute time value .
  • the embodiment of the present invention further provides a relay device for performing the foregoing method, where the relay device includes a first network port in a relay system including a host base station and a remote base station. At least one second network port and a processor, wherein the processor is configured to:
  • the first network port Receiving, by the first network port, a first data frame that is sent by the host base station, where the first data frame includes: a system frame number of the second data frame, a subframe number of the second data frame, and the An absolute time value of a start position of the second data frame; the second data frame is a data frame sent by the host base station after the first data frame;
  • the relay device may further include: a radio frame synchronization WFS module, a clock processing timestamp CPTS module, and a local crystal oscillator; the absolute time value is a whole Second value, and
  • the processor is configured to use, according to a system frame number of the first data frame, a subframe number of the first data frame, and a system frame number of the second data frame, and the second data frame subframe Number, calculating a number N of subframes in which the first data frame and the second data frame are different, and storing the N in a counter of the WFS module; wherein N is an integer greater than or equal to 1;
  • the WFS module is configured to send, when the number of system subframe pulses received by the WFS module is the N, a second pulse to the CPTS module;
  • the CPTS module is configured to: after receiving the second pulse, read the whole second value, update the current second value stored by the CPTS module by using the whole second value, and simultaneously store the current storage of the CPTS module.
  • the nanosecond value is cleared, the CPTS is counted by the local crystal oscillator, and the combination of the whole second value and the nanosecond value after the nanosecond count is determined as the time value after synchronizing the absolute time value;
  • the CPU is further configured to perform clock timing on the at least one remote base station by using a protocol packet exchanged with the remote base station that is sent and received by the at least one second network port of the relay device; And the second network port is configured to send and receive protocol packets corresponding to the remote base station, and the protocol packet sent by the processor to the remote base station carries: the absolute time value in the CPTS module The time value after synchronization.
  • a network The port only corresponds to one remote base station, so that the CPU in the relay device needs to maintain the IP addresses of the two remote base stations.
  • the IP addresses are not uniform.
  • the relay device may further include: a radio frame synchronization WFS module, a clock processing timestamp CPTS module, and a local crystal oscillator.
  • a switching module the switching module comprising: a real-time clock driving the RTC unit; the absolute time value is a full second value, and
  • the processor is configured to use, according to a system frame number of the first data frame, a subframe number of the first data frame, and a system frame number of the second data frame, and the second data frame subframe Number, calculating a number N of subframes in which the first data frame and the second data frame are different, and storing the N in a counter of the WFS module; wherein N is an integer greater than or equal to 1;
  • the WFS module is configured to send, by the CPTS module, a second pulse to the RTC unit of the switching module when the number of system subframe pulses received by the WFS module is the N;
  • the RTC unit of the switching module is configured to: after receiving the second pulse, read the whole second value, and update the entire second value stored by the RTC unit of the switching module with the whole second value, and simultaneously The nanosecond value currently stored by the RTC unit is cleared, the local crystal oscillator performs nanosecond counting on the RTC, and the combination of the whole second value and the nanosecond value after the nanosecond count is determined to be the absolute time value. Time value after synchronization;
  • the CPU is further configured to perform clock timing on the at least one remote base station by using a protocol packet that the switching module interacts with the at least one remote base station; where the switching module sends the remote base station to the remote base station
  • the delivered protocol packet carries: a time value after synchronizing the absolute time value in the RTC unit module.
  • the embodiment of the present invention provides an air interface time synchronization method for a relay system, and a relay device, which receives a first data frame sent by the host base station, where the first data frame includes: second data. a system frame number of the frame, a subframe number of the second data frame, and an absolute time value of a start position of the second data frame; the second data frame is a data frame sent by the host base station after the first data frame; and a start position of the second data frame according to the number of subframes between the first data frame and the second data frame
  • the absolute time value is synchronized; clock timing is performed on at least one remote base station according to the synchronized time value.
  • the relay device performs timing for the remote base station, thereby avoiding the problem of installation location limitation caused by GPS synchronization in the existing LTE-A relay system.
  • 1 is a structural diagram of an existing LTE-A relay system
  • FIG. 2 is a flowchart of an air interface time synchronization method of a relay system according to an embodiment of the present invention
  • FIG. 4 is a structural diagram of a relay device 10 according to an embodiment of the present invention.
  • FIG. 5 is a structural diagram of a relay device 10 according to an embodiment of the present invention.
  • FIG. 6 is a structural diagram of a relay device 10 according to an embodiment of the present invention.
  • the main principle of the present invention is that the RUE keeps time synchronization with the DeNB based on the LTE air interface timing scheme (when the DeNB is used as the clock source), and then the RUE uses the synchronized time value as the time source to perform clock timing to the next-level device ReBTS. Enable ReBTS to get accurate time synchronization.
  • FIG. 2 is a flowchart of a method for synchronizing air interface time of a relay system according to an embodiment of the present invention.
  • the method is applied to a relay system, where the relay system may include: a base station, a relay device, and a remote end. a base station, where the remote base station receives data sent by the host base station through the relay device, or uploads data to the host base station through the relay base station; as shown in FIG. 2, the method may include:
  • Step 101 The relay device receives a first data frame that is sent by the host base station, where the first data frame includes: a system frame number of the second data frame, a subframe number of the second data frame, and the An absolute time value of a starting position of the second data frame; the second data frame is a data frame sent by the host base station after the first data frame.
  • the first data frame is any data frame sent by the host base station
  • the second data frame may be any data corresponding to the whole second value sent by the host base station after the first data frame is sent.
  • the absolute time can be a full second value. Preferably, it can be a 48-second full-second value.
  • the relay device may synchronously receive the first data frame that is sent by the host base station by using an air interface synchronization technology.
  • the air interface synchronization technology mainly adopts a primary synchronization signal (English name: Primary Synchronization Signal, English abbreviation: PSS) and a secondary synchronization signal (SSS) principle, and uses a cell reference message (English name: Cell-Specific Reference) Signal, English abbreviation: CRS) Time Tracking (TA) and Frequency Tracking (FA), in order to make the relay device align with the data frame air interface sent by the host base station in time, The TA adjustment of the fixed deviation is required after the device.
  • PSS Primary Synchronization Signal
  • SSS secondary synchronization signal
  • CRS Cell-Specific Reference
  • TA Time Tracking
  • FA Frequency Tracking
  • the TA adjustment is set to the integer of TA.
  • the value adjustment amount that is, one TA is equal to 16 TSs, and the adjustment precision is 0.52 us.
  • the TS can be used as the adjustment amount precision, so that the adjustment precision is accurate to 0.0325. Us.
  • Step 102 The relay device synchronizes the absolute time value of the start position of the second data frame according to the number of subframes in which the first data frame and the second data frame are different.
  • the absolute time value is a whole second value
  • the absolute position of the second data frame is determined according to the number of subframes that are different between the first data frame and the second data frame.
  • Synchronizing time values can include:
  • the number of received system subframe pulses is the N
  • triggering reading the whole second value and updating the whole second value currently stored by the relay device by using the whole second value
  • the nanosecond value currently stored by the device is cleared, and the nanosecond count is performed
  • the combination of the whole second value and the nanosecond value after the nanosecond count is determined as the time value after synchronizing the absolute time value.
  • the nanosecond count is: every time a nanosecond is generated, the currently stored nanosecond value is incremented by one, and so on, until the nanosecond pulse output is one full second, and the current stored whole second value is incremented by one. Clear the nanosecond value and repeat the nanosecond count.
  • the frame number of the first data frame is 0, the subframe number is 1, the frame number of the second data frame is 3, the subframe number is 1, and the absolute time of the start position of the second data frame is a second.
  • the first data frame and the second data frame are separated by 20 subframes, that is, the second data frame can be received after 20 subframes after receiving the first data frame.
  • the relay device synchronizes with the host base station through the air interface, each frame receives a frame pulse, so when the WFS module receives 20 frame pulses, it indicates the arrival of the second data frame.
  • the absolute time a seconds can be replaced by the original second value of the CPTS module, and the whole second value of the start position of the second data frame is synchronized.
  • the nanosecond value in the CPTS is cleared to zero, and the local crystal oscillator performs nanosecond counting according to the natural frequency of the relay device. If the nanosecond counts to b nanoseconds at this time, it can be known that the absolute time synchronization time value is a second. b nanoseconds.
  • Step 103 The relay device performs clock timing on the at least one remote base station according to the synchronized time value.
  • the remote base station may be any device that receives a data frame delivered by the host base station through the relay device, such as the ReBTS shown in FIG. 1.
  • the clocking the at least one remote base station according to the synchronized time value includes:
  • the at least one remote base station is clocked by the protocol packet that is exchanged with the at least one remote base station, where the protocol packet carries: a time value after synchronizing the absolute time value .
  • the relay device can perform clock timing on the at least one remote base station by using the 1588v2 time synchronization principle. details as follows:
  • the at least one remote base station is clocked by the 1588v2 protocol packet exchanged with the remote base station by the at least one network port of the relay device; wherein the network port and the remote base station
  • the one-to-one correspondence sends and receives the 1588v2 protocol packet, and the 1588V2 protocol packet sent by the CPU to the remote base station carries: the time value after the absolute time value is synchronized.
  • the network port can be a Gigabit Ethernet port GE.
  • the 1588v2 time synchronization principle is an existing synchronization technology, and is briefly introduced here.
  • the relay device and the remote base station perform clock timing on the remote base station through the 1588v2 protocol packet exchange. process:
  • the relay device sends a Sync message at time t1, and carries the t1 timestamp in the message; wherein the t1 timestamp is the synchronization time value in the CPTS module at time t1.
  • the remote base station receives the Sync message at time t2, generates a t2 timestamp locally, and extracts a t1 timestamp from the message, and sends a Delay_Req message at time t3, and generates a t3 timestamp locally;
  • the relay device receives the Delay_Req message at time t4 and generates it locally. The t4 timestamp is then carried in the Delay_Resp message and transmitted back to the remote base station;
  • the t4 timestamp is a synchronization time value in the CPTS module at time t4; for example, if the synchronization time value in the relay device at time t1 is: a second b nanoseconds, the t1 timestamp is a second b nanoseconds, At this time, if the nanosecond value of the relay device is increased by 3 nanoseconds from time t1 to time t4, the timestamp of t4 is: a second (b+3) nanosecond.
  • the remote base station receives the Delay_Resp packet and extracts the t4 timestamp from the packet.
  • Offset [(t2-t1)-(t4-t3)-(Delayms-Delaysm)]/2;
  • the time offset Offset between the self and the relay device can be calculated according to the four time stamps t1, t2, t3, and t4, and the time of the self is adjusted to synchronize with the relay device.
  • the embodiment of the present invention provides an air interface time synchronization method for a relay system, where the relay device receives a first data frame that is sent by the host base station, where the first data frame includes: a system frame number of the data frame, a subframe number of the second data frame, and an absolute time value of a start position of the second data frame; the second data frame being the host after the first data frame a data frame sent by the base station; synchronizing the absolute time value of the start position of the second data frame according to the number of subframes in which the first data frame and the second data frame are different; according to the time after synchronization
  • the value is clocked to at least one remote base station.
  • the relay device performs timing for the remote base station, thereby avoiding the problem of installation location limitation caused by GPS synchronization in the existing LTE-A relay system.
  • the following example shows and describes in the form of a structural block diagram the functional unit of the relay device of the present invention performing the above method.
  • the relay is Devices include, but are not limited to, functional units in the figures.
  • FIG. 4 is a structural diagram of a relay device 10 according to an embodiment of the present invention.
  • the relay system further includes: a host base station and a remote base station, where the Following equipment includes:
  • the receiving unit 201 is configured to receive a first data frame that is sent by the host base station, where the first data frame includes: a system frame number of the second data frame, a subframe number of the second data frame, and the An absolute time value of a start position of the second data frame; the second data frame is a data frame sent by the host base station after the first data frame;
  • the synchronization unit 202 is configured to synchronize an absolute time value of the start position of the second data frame according to the number of subframes in which the first data frame and the second data frame are different from each other;
  • the timing unit 203 is configured to perform clock timing on the at least one remote base station according to the synchronized time value.
  • the synchronization unit 202 can be used to:
  • the number of received system subframe pulses is the N
  • triggering reading the whole second value and updating the whole second value currently stored by the relay device with the whole second value
  • the nanosecond value currently stored by the device is cleared, and the nanosecond count is performed
  • the combination of the whole second value and the nanosecond value after the nanosecond count is determined as the time value after synchronizing the absolute time value.
  • the nanosecond count is: every nanosecond generated, the nanosecond value currently stored by the relay device is incremented by one, and so on, until the nanosecond pulse output is one full second, the relay device is currently stored.
  • the second value is incremented by one, the nanosecond value is cleared, and the nanosecond count is re-calculated.
  • the frame number of the first data frame is 0, the subframe number is 1, the frame number of the second data frame is 3, the subframe number is 1, and the absolute time of the start position of the second data frame is a second.
  • the first data frame and the second data frame are separated by 20 subframes, that is, the second data frame can be received after 20 subframes after receiving the first data frame.
  • the relay device synchronizes with the host base station through the air interface, each frame receives a frame pulse, so when the WFS module receives 20 frame pulses, it indicates the arrival of the second data frame.
  • the absolute time a second can be replaced by the original second value of the CPTS module, the synchronization of the whole second value of the start position of the second data frame is completed, and then the nanosecond value in the CPTS is cleared to zero.
  • the crystal oscillator performs nanosecond counting according to the natural frequency of the relay device. If the nanosecond counts to b nanoseconds at this time, it can be seen that the absolute time synchronization time value is a second b nanoseconds.
  • timing unit 203 can be used to:
  • the at least one remote base station is clocked by a protocol packet that is exchanged with the at least one remote base station, where the protocol packet carries: a time value after synchronizing the absolute time value .
  • the timing unit 203 can perform clock timing on the at least one remote base station by using the 1588v2 time synchronization principle, for example, the timing unit 203 is configured to use the 1588v2 protocol packet that interacts with the remote base station. At least one remote base station performs clock timing; wherein the 1588V2 protocol packet carries: a time value after synchronizing the absolute time value.
  • the embodiment of the present invention provides a relay device, which receives a first data frame that is sent by the host base station, where the first data frame includes: a system frame number and a second data of the second data frame. a subframe number of the frame, and an absolute time value of a start position of the second data frame; the second data frame is a data frame sent by the host base station after the first data frame; Synchronizing the absolute time value of the start position of the second data frame with the number of subframes between the first data frame and the second data frame; and clocking at least one remote base station according to the synchronized time value .
  • the relay device performs timing for the remote base station, thereby avoiding the problem of installation location limitation caused by GPS synchronization in the existing LTE-A relay system.
  • FIG. 5 is a structural diagram of a relay device 10 according to an embodiment of the present invention, which is included in In the relay system shown in FIG. 1, the relay system further includes: a host base station and a remote base station, and the relay device includes a first network port, at least one second network port, and a processor (Central Processing) Unit, CPU) 101.
  • a host base station and a remote base station the relay device includes a first network port, at least one second network port, and a processor (Central Processing) Unit, CPU) 101.
  • CPU Central Processing
  • the first network port and the at least one second network port are communication interfaces in the relay device 10, and are used for data communication with the external network element.
  • the processor 101 may be a central processing unit (CPU 101), may be an Application Specific Integrated Circuit (ASIC), or be configured to implement one or more embodiments of the present invention.
  • An integrated circuit such as one or more digital singular processors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs).
  • the processor 101 is configured to receive, by using the first network port, a first data frame that is sent by the host base station, where the first data frame includes: a system frame number of the second data frame, and second data. a subframe number of the frame, and an absolute time value of the start position of the second data frame; the second data frame is a data frame sent by the host base station after the first data frame;
  • the relay device 10 may further include: a Wireless Frame Synchronization (WFS) module 102, a Clock Process Time Stamp (CPTS) module 103, and a local crystal oscillator 104.
  • WFS Wireless Frame Synchronization
  • CPTS Clock Process Time Stamp
  • the processor 101, the WFS module 102, and the CPTS module 103 can be integrated on the same circuit.
  • the WFS module 102, the CPTS module 103, and the local crystal oscillator 104 are commonly used modules in the industry, and are not further described herein.
  • the absolute time value is a whole second value
  • the processor 101 is configured to use, according to a system frame number of the first data frame, a subframe number of the first data frame, and a system frame number of the second data frame and the second data frame. a frame number, calculating a subframe in which the first data frame and the second data frame are different from each other Number N, and storing the N in a counter of the WFS module 102; wherein N is an integer greater than or equal to 1;
  • the WFS module 102 is configured to send a second pulse to the CPTS module 103 when the number of system subframe pulses received by the WFS module 102 is the N;
  • the CPTS module 103 is configured to read the whole second value after receiving the second pulse, and update the entire second value currently stored by the CPTS module 103 by using the whole second value, and simultaneously the CPTS module 103
  • the currently stored nanosecond value is cleared, the local crystal oscillator 104 performs nanosecond counting on the CPTS, and the combination of the whole second value and the nanosecond value after the nanosecond count is determined as the synchronization of the absolute time value. Time value.
  • the nanosecond count is: a local crystal oscillator is used as a clock source, and every nanosecond generated, the nanosecond value in the CPTS module is incremented by one, and so on, until the nanosecond pulse output of the local crystal oscillator is one full second. Add the whole second value in the CPTS to one, clear the nanosecond value in the CPTS, and re-perform the nanosecond.
  • the frame number of the first data frame is 0, the subframe number is 1, the frame number of the second data frame is 3, the subframe number is 1, and the absolute time of the start position of the second data frame is a second.
  • the first data frame and the second data frame are separated by 20 subframes, that is, the second data frame can be received after 20 subframes after receiving the first data frame.
  • the relay device synchronizes with the host base station through the air interface, each frame receives a frame pulse, so when the WFS module receives 20 frame pulses, it indicates the arrival of the second data frame.
  • the absolute time a second can be replaced by the original second value of the CPTS module, the synchronization of the whole second value of the start position of the second data frame is completed, and then the nanosecond value in the CPTS is cleared to zero.
  • the crystal oscillator performs nanosecond counting according to the natural frequency of the relay device. If the nanosecond counts to b nanoseconds at this time, it can be seen that the absolute time synchronization time value is a second b nanoseconds.
  • the processor is further configured to perform clock timing on the at least one remote base station by using a protocol packet exchanged with the remote base station that is sent and received by the at least one second network port of the relay device; Transmitting, by the second network port, the protocol packet corresponding to the remote base station, where the protocol packet sent by the processor to the remote base station carries: The time value after synchronizing the absolute time value in the CPTS module.
  • the processor may perform clock timing on at least one remote base station by using a 1588v2 time synchronization principle, specifically:
  • the CPU 101 is further configured to perform clock timing on the at least one remote base station by using a 1588v2 protocol packet exchanged with the remote base station, which is sent and received by the at least one network port of the relay device, where the network is clocked;
  • the port is configured to send and receive 1588v2 protocol packets in a one-to-one correspondence with the remote base station, and the 1588V2 protocol packet sent by the CPU to the remote base station carries: the CPTS module synchronizes the absolute time value After the time value.
  • the network port can be a Gigabit Ethernet interface GE.
  • the CPU 101, the WFS module 102, and the CPTS module 103 are integrated on the same circuit of the relay device, and the CPU 101 can read the CPTS module 103 in real time.
  • the value of the time after the synchronization is synchronized with the remote base station ReBTS0 to perform the 1588v2 protocol packet exchange.
  • the clock is sent to the ReBTS0.
  • the GE1 interface interacts with the remote base station ReBTS1 to perform the 1588v2 protocol packet exchange. Clock timing.
  • the relay device 10 can also be the structure shown in FIG. 6, as shown in FIG.
  • the relay device 10 may include a CPU 101, a WFS module 102, a CPTS module 103, a local crystal oscillator 104, and a switching module 105.
  • the switching module 105 includes a real-time clock-driven RTC unit 1051.
  • the CPU 101, the WFS module 102, and the CPTS module 103 may be integrated on the same circuit, and the switch module 105 may be outside the integrated circuit, and the switch module may be any module capable of forwarding data to multiple devices at a lower level, and may be exchanged.
  • the same port of module 105 clocks multiple remote base stations.
  • the present invention implements
  • the host base station can be The time is directly synchronized to the RTC unit 1051 of the switching module 105.
  • the switching module 105 reads the synchronization time value of the switch and performs the interaction of the remote base station with the 1588v2 protocol packet to complete the clock timing of the remote base station.
  • the absolute time value is a whole second value
  • the CPU 101 is configured to use, according to the system frame number of the first data frame, a subframe number of the first data frame, and a system frame number of the second data frame and the second data frame subframe number. Calculating a number N of subframes in which the first data frame and the second data frame are different, and storing the N in a counter of the WFS module 102; wherein N is an integer greater than or equal to 1;
  • the WFS module 102 is configured to send, by the CPTS module 103, a second pulse to the RTC unit 1051 of the switching module when the number of system subframe pulses received by the WFS module 102 is the N;
  • the RTC unit 1051 of the switching module is configured to read the whole second value after receiving the second pulse, and update the entire second value currently stored by the RTC unit 1051 of the switching module by using the whole second value.
  • the nanosecond value currently stored by the RTC unit 1051 is cleared, the local crystal oscillator 104 performs nanosecond counting on the RTC, and the combination of the whole second value and the nanosecond value after the nanosecond count is determined as The time value after the absolute time value is synchronized.
  • the processor is further configured to perform clock timing on the at least one remote base station by using a protocol packet exchanged by the switching module with the at least one remote base station; where the switching module is to the remote end
  • the protocol packet sent by the base station carries: a time value after the absolute time value is synchronized in the RTC unit module.
  • the processor may perform clock timing on at least one remote base station by using a 1588v2 time synchronization principle, specifically:
  • the CPU 101 is further configured to perform clock timing on the at least one remote base station by using a 1588v2 protocol packet that the switching module 105 interacts with the at least one remote base station; where the switching module is to the far
  • the 1588 V2 protocol packet delivered by the terminal base station carries: a time value obtained by synchronizing the absolute time value in the module of the RTC unit 1051.
  • the timestamp in the 1588V2 protocol packet sent by the switch module is entered by the switch module itself.
  • the time of the data frame sent by the host base station is first synchronized to the RTC unit 1051 in the switch module 105. Then, the CPU 101 can read the RTC unit 1051 in the switch module 105 in real time through the network port GE0. After the synchronization, the time value of the synchronization module is exchanged with the remote base station ReBTS0 and ReBTS1 for the 1588v2 protocol packet, and the clock timing of the ReBTS0 and the ReBTS1 is completed, and at the same time, the other network port GE1 can be passed. The port performs near-end maintenance so that the maintenance and service needs of the relay device can be reused.
  • the embodiment of the present invention provides a relay device, which receives a first data frame that is sent by the host base station, where the first data frame includes: a system frame number and a second data of the second data frame. a subframe number of the frame, and an absolute time value of a start position of the second data frame; the second data frame is a data frame sent by the host base station after the first data frame; Synchronizing the absolute time value of the start position of the second data frame with the number of subframes between the first data frame and the second data frame; and clocking at least one remote base station according to the synchronized time value .
  • the relay device performs timing for the remote base station, thereby avoiding the problem of installation location limitation caused by GPS synchronization in the existing LTE-A relay system.

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Abstract

本发明公开了一种中继系统的空口时间同步方法、设备，涉及通信技术领域，以解决现有中继系统中，采用GPS时间同步导致的安装位置限制的问题，本发明实施例提供的方法应用于中继系统，中继系统包括：宿主基站、中继设备、远端基站，所述方法由所述中继设备执行，包括：接收宿主基站下发的第一数据帧，其中，第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及第二数据帧的起始位置的绝对时间值；第二数据帧为在第一数据帧之后宿主基站下发的数据帧；根据第一数据帧以及第二数据帧间相差的子帧数，对第二数据帧起始位置的绝对时间值进行同步；根据同步后的时间值对至少一个远端基站进行时钟授时。

Description

中继系统的空口时间同步方法、设备
本申请要求于2015年10月29日提交中国专利局、申请号为201510718257.5、发明名称为“中继系统的空口时间同步方法、设备”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
本发明涉及通信技术领域，尤其涉及一种中继系统的空口时间同步方法、设备。
背景技术
中继(Relay)技术是长期演进增强型(Long Term Evolution Advanced，LTE-A)系统的主要技术之一，通过“宿主基站(例如，Donor eNB，DeNB)与中继设备(例如，Relay User Equipment，RUE)”为远端基站(例如，Remote Base Transceiver Station，ReBTS)提供无线传输通道，解决了部分站点无传统系统承载网的问题。例如，图1为现有LTE-A系统的结构图，如图1所示，该系统包括：DeNB、RUE、ReBTS，其中，DeNB和RUE通过无线连接，RUE和ReBTS间有线连接，DeNB发送的下行数据先传给中继设备RUE，再由RUE传输至ReBTS，由ReBTS将下行数据发送给其终端用户，如此，拉近了天线和终端用户间的距离，改善了终端的链路质量，从而提高系统的频谱效率和用户数据率。
在LTE-A通信系统中，对于ReBTS而言，需要网络时间同步。现有实现网络同步的主要技术为：ReBTS采用卫星GPS时钟源进行时间同步，即如图1所示，ReBTS直接与全球定位系统(Global Positioning System，GPS)连接，获取精确时间。但是，GPS对室内设备无用，对安装位置有严格限制。
发明内容
为解决上述问题，本发明提供一种3GPP Relay系统的空口时间 同步方法、设备，以解决现有中继系统中，采用GPS时间同步导致的安装位置限制的问题。
本发明的实施例采用如下技术方案：
第一方面，本发明实施例提供一种中继系统的空口时间同步方法，所述方法可应用于包括：宿主基站、中继设备、远端基站的中继系统，所述方法为：
中继设备先接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；
然后，根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；根据同步后的时间值对至少一个远端基站进行时钟授时。
如此，通过中继设备为远端基站进行授时，避免了现有LTE-A的中继系统中，采用GPS同步导致的安装位置限制的问题。
优选的，在本案中，所述绝对时间值为一整秒值，中继设备可以通过下述方式对绝对时间值进行同步，并根据同步后的时间值向远端基站授时：
根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N；其中，N为大于等于1的整数；
当接收到的系统子帧脉冲的个数为所述N时，触发读取所述整秒值，并用所述整秒值更新所述中继设备当前存储的整秒值，同时将所述中继设备当前存储的纳秒值清零，并进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值；
通过与所述至少一个远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时；其中，所述协议报文中携带有：对所述 绝对时间值进行同步后的时间值。
第二方面，本发明实施例还提供了一种用于执行上述方法的中继设备，包含在包括有宿主基站、远端基站的中继系统中，所述中继设备包括：
接收单元，用于接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；
同步单元，用于根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；
授时单元，用于根据同步后的时间值对至少一个远端基站进行时钟授时。
优选的，所述绝对时间值为一整秒值，所述同步单元可以用于：
根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N；其中，N为大于等于1的整数；
当接收到的系统子帧脉冲的个数为所述N时，读取所述整秒值，用所述整秒值更新所述中继设备中的整秒值，同时将所述中继设备中的纳秒值清零，并进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值。
所述授时单元，具体可以用于：
通过与所述至少一个远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时，其中，所述协议报文中携带有：对所述绝对时间值进行同步后的时间值。
第三方面，本发明实施例还提供了一种用于执行上述方法的中继设备，包含在包括有宿主基站、远端基站的中继系统中，所述中继设备包括第一网口、至少一个第二网口和处理器，其中，所述处理器用于：
通过第一网口接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；
根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；
根据同步后的时间值通过所述至少一个第二网口对至少一个远端基站进行时钟授时。
在第三方面的一种可实现方式中，结合第三方面，所述中继设备还可以包括：无线帧同步WFS模块、时钟处理时间戳CPTS模块以及本地晶振；所述绝对时间值为一整秒值，且
所述处理器，用于根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N，并将所述N存储到WFS模块的计数器中；其中，N为大于等于1的整数；
所述WFS模块，用于当所述WFS模块接收到的系统子帧脉冲的个数为所述N时，向所述CPTS模块发送一个秒脉冲；
所述CPTS模块，用于接收到所述秒脉冲后，读取所述整秒值，用所述整秒值更新所述CPTS模块当前存储的整秒值，同时将所述CPTS模块当前存储的纳秒值清零，由所述本地晶振对所述CPTS进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值；
所述CPU，还用于通过所述中继设备中至少一个第二网口收发的与所述远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时；其中，所述第二网口与所述远端基站一一对应的收发协议报文，所述处理器向所述远端基站下发的协议报文中携带有：所述CPTS模块中对所述绝对时间值进行同步后的时间值。
但是，由于上述结构的中继设备向远端授时的过程中，一个网 口仅对应一个远端基站，使得中继设备中的CPU需要维护两个远端基站的IP地址，IP地址不统一，且在网口时，中继设备的维护和业务不能同时复用。
因此，为了避免该问题的出现，在第三方面的又一种可实现方式，结合第三方面，所述中继设备还可以包括：无线帧同步WFS模块、时钟处理时间戳CPTS模块、本地晶振以及交换模块，所述交换模块包括：实时时钟驱动RTC单元；所述绝对时间值为一整秒值，且
所述处理器，用于根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N，并将所述N存储到WFS模块的计数器中；其中，N为大于等于1的整数；
所述WFS模块，用于当所述WFS模块接收到的系统子帧脉冲的个数为所述N时，通过所述CPTS模块向所述交换模块的RTC单元发送一个秒脉冲；
所述交换模块的RTC单元，用于接收到所述秒脉冲后，读取所述整秒值，用所述整秒值更新所述交换模块的RTC单元当前存储的整秒值，同时将所述RTC单元当前存储的纳秒值清零，由所述本地晶振对所述RTC进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值；
所述CPU，还用于通过所述交换模块与所述至少一个远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时；其中，所述交换模块向所述远端基站下发的协议报文中携带有：所述RTC单元模块中对所述绝对时间值进行同步后的时间值。
由上可知，本发明实施例提供一种中继系统的空口时间同步方法及中继设备，接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为 在所述第一数据帧之后所述宿主基站下发的数据帧；根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；根据同步后的时间值对至少一个远端基站进行时钟授时。如此，通过中继设备为远端基站进行授时，避免了现有LTE-A的中继系统中，采用GPS同步导致的安装位置限制的问题。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为现有LTE-A中继系统的结构图；
图2为本发明实施例提供的中继系统的空口时间同步方法的流程图；
图3为现有1588V2同步原理的流程图；
图4为本发明实施例提供的中继设备10的结构图；
图5为本发明实施例提供的中继设备10的结构图；
图6为本发明实施例提供的中继设备10的结构图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
应理解的是，本发明实施例提供的技术方案可以应用于LTE-A系统中中继(Relay)传输下的时钟授时，也可以应用于其他系统下的时钟授时，本发明实施例对此不进行限定，本发明仅以图1所示的LTE-A系统的中继传输为例进行说明。
本发明的主要原理是：RUE基于LTE空口的授时方案与DeNB保持时间同步(此时DeNB作为时钟源)，然后RUE以同步后的时间值作为时间源，向下一级设备ReBTS进行时钟授时，使ReBTS获取到精确的时间同步。下面基于上述原理对本发明实施例提供的技术方案进行详细介绍：
实施例一
图2为本发明实施例提供的一种中继系统的空口时间同步方法的流程图，所述方法应用于中继系统中，所述中继系统可以包括：宿主基站、中继设备以及远端基站，其中，远端基站通过中继设备接收宿主基站下发的数据，或者通过中继基站向所述宿主基站上传数据；如图2所示，所述方法可以包括：
步骤101：中继设备接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧。
其中，所述第一数据帧为宿主基站下发的任一数据帧；所述第二数据帧可以为宿主基站在下发第一数据帧后下发的任一绝对时间为整秒值对应的数据帧；所述绝对时间可以为一整秒值，优选的，可以为48bit的整秒值。
可选的，所述中继设备可以通过空口同步技术同步接收宿主基站下发的第一数据帧。
其中，所述空口同步技术主要采用主同步信号(英文全称：Primary Synchronization Signal，英文缩写：PSS)、辅同步信号(Secondary Synchronization Signal，SSS)原理，通过小区参考消息(英文全称：Cell-Specific Reference Signal，英文缩写：CRS)进行时偏跟踪(Time Tracking，TA)和频偏跟踪(Frequency Tracking，FA)，其中，为了使中继设备在时间上与宿主基站下发的数据帧空口对齐，中继设备需要进行固定偏差的TA调整。
通常，在通信协议的标准定义中，将TA调整设置为TA的整数 值调整量，即一个TA等于16个TS，调整精度为0.52us，而在本发明中，为提高时域对准精度，可选的，可以采用TS为调整量精度，使调整精度精确到0.0325us。
步骤102：中继设备根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步。
示例性的，所述绝对时间值为一整秒值，所述根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步可以包括：
根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N；其中，N为大于等于1的整数；
当接收到的系统子帧脉冲的个数为所述N时，触发读取所述整秒值，用所述整秒值更新所述中继设备当前存储的整秒值，同时将所述中继设备当前存储的纳秒值清零，并进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值。
其中，所述纳秒计数为：每产生一个纳秒，当前存储的纳秒值就加一，依次类推，直到纳秒脉冲输出为1个整秒后，将当前存储的整秒值加一，对纳秒值清零，重新进行纳秒计数。
例如，上述第一数据帧的帧号为0、子帧号为1，第二数据帧的帧号为3、子帧号为1，第二数据帧起始位置的绝对时间为a秒，则根据计算可知：第一数据帧与第二数据帧间相差20个子帧，即在接收到第一数据帧后经过20个子帧才能接收到第二数据帧。由于，中继设备与宿主基站通过空口同步后，每接收到一个子帧，会向WFS模块输出一个帧脉冲，所以，当WFS模块接收到20个帧脉冲后，预示着第二数据帧的到来，此时，可以将绝对时间a秒替换掉CPTS模块原有的整秒值，完成第二数据帧起始位置的整秒值的同步，然 后，将CPTS中的纳秒值清零，由本地晶振按照中继设备的固有频率进行纳秒计数，若此时纳秒计数到b纳秒，则可知：绝对时间的同步时间值为a秒b纳秒。
步骤103：中继设备根据同步后的时间值对至少一个远端基站进行时钟授时。
其中，所述远端基站可以为通过中继设备接收宿主基站下发的数据帧的任一设备，如可以为图1所示的ReBTS。
所述根据同步后的时间值对至少一个远端基站进行时钟授时具体包括：
通过与所述至少一个远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时；其中，所述协议报文中携带有：对所述绝对时间值进行同步后的时间值。
可选的，中继设备可以通过1588v2时间同步原理对至少一个远端基站进行时钟授时。具体如下：
通过所述中继设备中至少一个网口收发的与所述远端基站交互的1588v2协议报文，对所述至少一个远端基站进行时钟授时；其中，所述网口与所述远端基站一一对应的收发1588v2协议报文，所述CPU向所述远端基站下发的1588V2协议报文中携带有：所述绝对时间值进行同步后的时间值。
其中，所述网口可以为千兆以太网口GE。
其中，所述1588v2时间同步原理为现有同步技术，在此进行简单介绍，例如，如图3所示，为中继设备与远端基站通过1588v2协议报文交互对远端基站进行时钟授时的过程：
1、中继设备在t1时刻发送Sync报文，并将t1时间戳携带在报文中；其中，所述t1时间戳为t1时刻CPTS模块中的同步时间值。
2、远端基站在t2时刻接收到Sync报文，在本地产生t2时间戳，并从报文中提取t1时间戳，并在t3时刻发送Delay_Req报文，并在本地产生t3时间戳；
3、中继设备在t4时刻接收到Delay_Req报文，并在本地产生 t4时间戳，然后将t4时间戳携带在Delay_Resp报文中，回传给远端基站；
其中，所述t4时间戳为t4时刻CPTS模块中的同步时间值；例如，假设t1时刻中继设备中的同步时间值为：a秒b纳秒，则t1时间戳为a秒b纳秒，此时，若从t1时刻到t4时刻中继设备的纳秒值又增加了3纳秒，则t4时间戳为：a秒(b+3)纳秒。
4、远端基站接收到Delay_Resp报文，从报文中提取t4时间戳。
假设中继设备到远端基站的发送路径延时是Delayms，远端基站到中继设备的发送路径延时是Delaysm，远端基站和中继设备之间的时间偏差为Offset。显然，这3个变量都是未知数，那么：
t2-t1＝Delayms+Offset；t4-t3＝Delaysm-Offset；
(t2-t1)-(t4-t3)＝(Delayms+Offset)-(Delaysm-Offset)；
Offset＝[(t2-t1)-(t4-t3)-(Delayms-Delaysm)]/2；
显然，如果Delayms＝Delaysm，即中继设备和远端基站之间的收发链路延时对称，那么：Offset＝[(t2-t1)-(t4-t3)]/2；这样远端基站就可以根据t1，t2，t3，t4四个时间戳计算出自己和中继设备之间的时间偏差Offset，调整自身的时间以达到和中继设备同步。
由上可知，本发明实施例提供一种中继系统的空口时间同步方法，所述中继设备接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；根据同步后的时间值对至少一个远端基站进行时钟授时。如此，通过中继设备为远端基站进行授时，避免了现有LTE-A的中继系统中，采用GPS同步导致的安装位置限制的问题。
为了便于描述，以下本实例以结构框图的形式示出并描述了本发明中继设备执行上述方法的功能单元，需要说明的是，所述中继 设备包括但不限于图示中的功能单元。
实施例二
图4为本发明实施例提供的一种中继设备10的结构图，包含在如图1所示的中继系统中，所述中继系统还包括：宿主基站、远端基站，所述中继设备包括：
接收单元201，用于接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；
同步单元202，用于根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；
授时单元203，用于根据同步后的时间值对至少一个远端基站进行时钟授时。
具体的，所述同步单元202可以用于：
根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N；其中，N为大于等于1的整数；
当接收到的系统子帧脉冲的个数为所述N时，触发读取所述整秒值，并用所述整秒值更新所述中继设备当前存储的整秒值，同时将所述中继设备当前存储的纳秒值清零，并进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值。
其中，所述纳秒计数为：每产生一个纳秒，中继设备当前存储的纳秒值就加一，依次类推，直到纳秒脉冲输出为1个整秒后，将中继设备当前存储整秒值加一，对纳秒值清零，重新进行纳秒计数。
例如，上述第一数据帧的帧号为0、子帧号为1，第二数据帧的帧号为3、子帧号为1，第二数据帧起始位置的绝对时间为a秒，则 根据计算可知：第一数据帧与第二数据帧间相差20个子帧，即在接收到第一数据帧后经过20个子帧才能接收到第二数据帧。由于，中继设备与宿主基站通过空口同步后，每接收到一个子帧，会向WFS模块输出一个帧脉冲，所以，当WFS模块接收到20个帧脉冲后，预示着第二数据帧的到来，此时，可以将绝对时间a秒替换掉CPTS模块原有的整秒值，完成第二数据帧起始位置的整秒值的同步，然后，将CPTS中的纳秒值清零，由本地晶振按照中继设备的固有频率进行纳秒计数，若此时纳秒计数到b纳秒，则可知：绝对时间的同步时间值为a秒b纳秒。
具体的，所述授时单元203，可以用于：
通过与所述至少一个远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时，其中，所述协议报文中携带有：对所述绝对时间值进行同步后的时间值。
例如，所述授时单元203可以采用1588v2时间同步原理对至少一个远端基站进行时钟授时，如：所述授时单元203，用于通过与所述远端基站交互的1588v2协议报文，对所述至少一个远端基站进行时钟授时；其中，所述1588V2协议报文中携带有：对所述绝对时间值进行同步后的时间值。
由上可知，本发明实施例提供一种中继设备，接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；根据同步后的时间值对至少一个远端基站进行时钟授时。如此，通过中继设备为远端基站进行授时，避免了现有LTE-A的中继系统中，采用GPS同步导致的安装位置限制的问题。
实施例三
图5为本发明实施例提供的一种中继设备10的结构图，包含在 如图1所示的中继系统中，所述中继系统还包括：宿主基站、远端基站，所述中继设备，包括第一网口、至少一个第二网口和处理器(Central Processing Unit，CPU)101。
其中，所述第一网口、至少一个第二网口为中继设备10中的通信接口，用于与外部网元进行数据通信。
所述处理器101可能是一个中央处理器(central processing unit，简称为CPU101)，也可以是特定集成电路(Application Specific Integrated Circuit，ASIC)，或者是被配置成实施本发明实施例的一个或多个集成电路，例如：一个或多个微处理器(digital singnal processor，DSP)，或，一个或者多个现场可编程门阵列(Field Programmable Gate Array，FPGA)。
所述处理器101，用于通过所述第一网口接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；
以及，根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；
并根据同步后的时间值对至少一个远端基站进行时钟授时。
具体的，如图5所示，所述中继设备10还可以包括：无线帧同步(Wireless Frame Synchronization，WFS)模块102、时钟处理时间戳(Clock Process Time Stamp，CPTS)模块103以及本地晶振104。
其中，处理器101、WFS模块102、CPTS模块103可以集成在同一电路上；WFS模块102、CPTS模块103以及本地晶振104为业界常用模块，在此不再一一赘述。
示例性的，所述绝对时间值为一整秒值，且，
所述处理器101，用于根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧 数N，并将所述N存储到WFS模块102的计数器中；其中，N为大于等于1的整数；
所述WFS模块102，用于当所述WFS模块102接收到的系统子帧脉冲的个数为所述N时，向所述CPTS模块103发送一个秒脉冲；
所述CPTS模块103，用于接收到所述秒脉冲后，读取所述整秒值，用所述整秒值更新所述CPTS模块103当前存储的整秒值，同时将所述CPTS模块103当前存储的纳秒值清零，由所述本地晶振104对所述CPTS进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值。
其中，所述纳秒计数为：本地晶振作为时钟源，每产生一个纳秒，CPTS模块中的纳秒值就加一，依次类推，直到本地晶振的纳秒脉冲输出为1个整秒后，将CPTS中的整秒值加一，对CPTS中的纳秒值清零，重新进行纳秒计数。
例如，上述第一数据帧的帧号为0、子帧号为1，第二数据帧的帧号为3、子帧号为1，第二数据帧起始位置的绝对时间为a秒，则根据计算可知：第一数据帧与第二数据帧间相差20个子帧，即在接收到第一数据帧后经过20个子帧才能接收到第二数据帧。由于，中继设备与宿主基站通过空口同步后，每接收到一个子帧，会向WFS模块输出一个帧脉冲，所以，当WFS模块接收到20个帧脉冲后，预示着第二数据帧的到来，此时，可以将绝对时间a秒替换掉CPTS模块原有的整秒值，完成第二数据帧起始位置的整秒值的同步，然后，将CPTS中的纳秒值清零，由本地晶振按照中继设备的固有频率进行纳秒计数，若此时纳秒计数到b纳秒，则可知：绝对时间的同步时间值为a秒b纳秒。
所述处理器，还用于通过所述中继设备中至少一个第二网口收发的与所述远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时；其中，所述第二网口与所述远端基站一一对应的收发协议报文，所述处理器向所述远端基站下发的协议报文中携带有： 所述CPTS模块中对所述绝对时间值进行同步后的时间值。
可选的，所述处理器可以采用1588v2时间同步原理对至少一个远端基站进行时钟授时，具体为：
所述CPU101，还用于通过所述中继设备中至少一个网口收发的与所述远端基站交互的1588v2协议报文，对所述至少一个远端基站进行时钟授时；其中，所述网口与所述远端基站一一对应的收发1588v2协议报文，所述CPU向所述远端基站下发的1588V2协议报文中携带有：所述CPTS模块中对所述绝对时间值进行同步后的时间值。
其中，所述网口可以为千兆以太网口GE；例如，如图5所示，CPU101、WFS模块102、CPTS模块103集成在中继设备的同一电路上，CPU101可以实时读取CPTS模块103中同步后的时间值，通过GE0口与远端基站ReBTS0进行1588v2协议报文的交互，完成对ReBTS0的时钟授时，通过GE1口与远端基站ReBTS1进行1588v2协议报文的交互，完成对ReBTS1的时钟授时。
但是，由于利用图5所示的中继设备向远端授时的过程中，一个网口仅对应一个远端基站，使得中继设备中的CPU需要维护两个远端基站的IP地址，IP地址不统一，且在网口时，中继设备的维护和业务不能同时复用，因此，为了避免该问题的出现，中继设备10还可以为图6所示的结构，如图6所示，所述中继设备10可以包括：CPU101、WFS模块102、CPTS模块103、本地晶振104以及交换模块105，所述交换模块105包括：实时时钟驱动RTC单元1051。其中，CPU101、WFS模块102、CPTS模块103可以集成在同一电路上，而交换模块105可以处于该集成电路之外，交换模块可以为能够向下级多个设备转发数据的任一模块，可以通过交换模块105的同一端口对多个远端基站进行时钟授时，
在图6中，为了避免将同步到CPTS模块103中的同步时间值发送给交换模块105，以使得交换模块105向下一级设备进行时钟授带来的时延和抖动的问题，本发明实施例中，可以将宿主基站的 时间直接同步到交换模块105的RTC单元1051，由交换模块105读取自身的同步时间值与多个远端基站进行1588v2协议报文的交互，完成对远端基站的时钟授时；具体为：
所述绝对时间值为一整秒值；
所述CPU101，用于根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N，并将所述N存储到WFS模块102的计数器中；其中，N为大于等于1的整数；
所述WFS模块102，用于当所述WFS模块102接收到的系统子帧脉冲的个数为所述N时，通过所述CPTS模块103向所述交换模块的RTC单元1051发送一个秒脉冲；
所述交换模块的RTC单元1051，用于接收到所述秒脉冲后，读取所述整秒值，用所述整秒值更新所述交换模块的RTC单元1051当前存储的整秒值，同时将所述RTC单元1051当前存储的纳秒值清零，由所述本地晶振104对所述RTC进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值。
所述处理器，还用于通过所述交换模块与所述至少一个远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时；其中，所述交换模块向所述远端基站下发的协议报文中携带有：所述RTC单元模块中对所述绝对时间值进行同步后的时间值。
可选的，所述处理器可以采用1588v2时间同步原理对至少一个远端基站进行时钟授时，具体为：
所述CPU101，还用于通过所述交换模块105与所述至少一个远端基站交互的1588v2协议报文，对所述至少一个远端基站进行时钟授时；其中，所述交换模块向所述远端基站下发的1588V2协议报文中携带有：所述RTC单元1051模块中对所述绝对时间值进行同步后的时间值。
其中，需要说明的是，当交换模块采用1588V2的同步方式向远端设备时，每次发送的1588V2协议报文中的时间戳由交换模块自己打入。
例如，如图6所示，先将宿主基站下发的数据帧的时间同步到交换模块105中的RTC单元1051上，然后，CPU101可以通过网口GE0实时读取交换模块105中RTC单元1051中同步后的时间值，通过交换模块105的多个端口与远端基站ReBTS0、ReBTS1进行1588v2协议报文的交互，完成对ReBTS0、ReBTS1的时钟授时，而与此同时，可以通过另一个网口GE1口进行近端维护，使中继设备的维护和业务需要可以进行复用。
由上可知，本发明实施例提供一种中继设备，接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；根据同步后的时间值对至少一个远端基站进行时钟授时。如此，通过中继设备为远端基站进行授时，避免了现有LTE-A的中继系统中，采用GPS同步导致的安装位置限制的问题。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应所述以权利要求的保护范围为准。

Claims (11)

  1. 一种中继系统的空口时间同步方法，其特征在于，所述方法应用于中继系统，所述中继系统包括：宿主基站、中继设备、远端基站，所述方法由所述中继设备执行，包括：
    接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；
    根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；
    根据同步后的时间值对至少一个远端基站进行时钟授时。
  2. 根据权利要求1所述的方法，其特征在于，所述绝对时间值为一整秒值，所述根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步具体包括：
    根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N；其中，N为大于等于1的整数；
    当接收到的系统子帧脉冲的个数为所述N时，触发读取所述整秒值，并用所述整秒值更新所述中继设备当前存储的整秒值，同时将所述中继设备当前存储的纳秒值清零，并进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值。
  3. 根据权利要求1或2所述的方法，其特征在于，所述根据同步后的时间值对至少一个远端基站进行时钟授时具体包括：
    通过与所述至少一个远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时；其中，所述协议报文中携带有：对所述绝对时间值进行同步后的时间值。
  4. 一种中继设备，包含在中继系统中，所述中继系统还包括：宿主基站、远端基站，其特征在于，所述中继设备包括：
    接收单元，用于接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；
    同步单元，用于根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；
    授时单元，用于根据同步后的时间值对至少一个远端基站进行时钟授时。
  5. 根据权利要求4所述的中继设备，其特征在于，所述绝对时间值为一整秒值，所述同步单元用于：
    根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N；其中，N为大于等于1的整数；
    当接收到的系统子帧脉冲的个数为所述N时，触发读取所述整秒值，并用所述整秒值更新所述中继设备当前存储的整秒值，同时将所述中继设备当前存储的纳秒值清零，并进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值。
  6. 根据权利要求4或5所述的中继设备，其特征在于，所述授时单元，具体用于：
    通过与所述至少一个远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时，其中，所述协议报文中携带有：对所述绝对时间值进行同步后的时间值。
  7. 一种中继设备，包含在中继系统中，所述中继系统还包括：宿主基站、远端基站，其特征在于，所述中继设备包括第一网口、至少一个第二网口和处理器，其中，所述处理器用于：
    通过所述第一网口接收所述宿主基站下发的第一数据帧，其中，所述第一数据帧包含：第二数据帧的系统帧号、第二数据帧的子帧号、以及所述第二数据帧的起始位置的绝对时间值；所述第二数据帧为在所述第一数据帧之后所述宿主基站下发的数据帧；
    根据所述第一数据帧以及所述第二数据帧间相差的子帧数，对所述第二数据帧起始位置的绝对时间值进行同步；
    根据同步后的时间值通过所述至少一个第二网口对至少一个远端基站进行时钟授时。
  8. 根据权利要求7所述的中继设备，其特征在于，所述中继设备还包括：无线帧同步WFS模块、时钟处理时间戳CPTS模块以及本地晶振；所述绝对时间值为一整秒值，且，
    所述处理器，用于根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N，并将所述N存储到WFS模块的计数器中；其中，N为大于等于1的整数；
    所述WFS模块，用于当所述WFS模块接收到的系统子帧脉冲的个数为所述N时，向所述CPTS模块发送一个秒脉冲；
    所述CPTS模块，用于接收到所述秒脉冲后，读取所述整秒值，用所述整秒值更新所述CPTS模块当前存储的整秒值，同时将所述CPTS模块当前存储的纳秒值清零，由所述本地晶振对所述CPTS进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值。
  9. 根据权利要求8所述的中继设备，其特征在于，
    所述处理器，还用于通过所述中继设备中至少一个第二网口收发的与所述远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时；其中，所述第二网口与所述远端基站一一对应的收发协议报文，所述处理器向所述远端基站下发的协议报文中携带有：所述CPTS模块中对所述绝对时间值进行同步后的时间值。
  10. 根据权利要求7所述的中继设备，其特征在于，所述中继设 备还包括：无线帧同步WFS模块、时钟处理时间戳CPTS模块、本地晶振以及交换模块，所述交换模块包括：实时时钟驱动RTC单元；所述绝对时间值为一整秒值，且：
    所述处理器，用于根据所述第一数据帧的系统帧号和所述第一数据帧的子帧号、以及所述第二数据帧的系统帧号和所述第二数据帧子帧号，计算所述第一数据帧和所述第二数据帧相差的子帧数N，并将所述N存储到WFS模块的计数器中；其中，N为大于等于1的整数；
    所述WFS模块，用于当所述WFS模块接收到的系统子帧脉冲的个数为所述N时，通过所述CPTS模块向所述交换模块的RTC单元发送一个秒脉冲；
    所述交换模块的RTC单元，用于接收到所述秒脉冲后，读取所述整秒值，用所述整秒值更新所述交换模块的RTC单元当前存储的整秒值，同时将所述RTC单元当前存储的纳秒值清零，由所述本地晶振对所述RTC进行纳秒计数，将纳秒计数后的整秒值和纳秒值的组合确定为对所述绝对时间值进行同步后的时间值。
  11. 根据权利要求10所述的中继设备，其特征在于，
    所述处理器，还用于通过所述交换模块与所述至少一个远端基站交互的协议报文，对所述至少一个远端基站进行时钟授时；其中，所述交换模块向所述远端基站下发的协议报文中携带有：所述RTC单元模块中对所述绝对时间值进行同步后的时间值。
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