CN108834166B - Remote base station time delay measurement system and method based on auxiliary transceiver - Google Patents
Remote base station time delay measurement system and method based on auxiliary transceiver Download PDFInfo
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- CN108834166B CN108834166B CN201810521225.XA CN201810521225A CN108834166B CN 108834166 B CN108834166 B CN 108834166B CN 201810521225 A CN201810521225 A CN 201810521225A CN 108834166 B CN108834166 B CN 108834166B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
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- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/364—Delay profiles
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
Abstract
The invention discloses a remote base station time delay measuring system and method based on auxiliary transceiver, comprising remote base station equipment, auxiliary transceiver and time delay measuring control center; the time delay measurement control center is respectively communicated with the remote base station equipment and the auxiliary transceiver equipment; the auxiliary transceiver device comprises a near-end auxiliary transceiver, a far-end auxiliary transceiver, a first switch and a second switch; the remote base station equipment comprises a near-end base station, a far-end base station, a third switcher and a fourth switcher; and the control center in the time delay measurement is used for controlling the remote base station equipment and the auxiliary transceiver equipment to carry out time delay measurement, receiving the feedback measurement information and calculating the link time delay of the remote base station. The invention provides a system and a method for measuring time delay of a remote base station based on auxiliary transceiver equipment, which accurately measure the link time delay of the remote base station under the auxiliary transceiver equipment and provide a basis for clock synchronization of the remote base station and a near-end base station.
Description
Technical Field
The present invention relates to a time delay measurement of a remote base station, and more particularly, to a remote base station time delay measurement system and method based on an auxiliary transceiver.
Background
The link delay measurement of the remote base station is to establish synchronization between all current Radio frequency units re (Radio Equipment) and REC (Radio Equipment Controller), so that it can be ensured that all current Radio frequency units in the base station can receive and transmit air interface data at the correct time. However, the remote base station has various network topologies, and especially, under the condition that the REs are connected in series and indirectly communicate with the REC, it is very important to effectively and accurately measure the link delay between each stage of RE and REC to ensure the communication performance of the remote base station. With the development of technologies such as 5G and updated communication, distributed beam forming needs higher clock synchronization precision; when the RE and the REC are connected by wire, the change of the length of the wire connection is caused by the change of the communication distance and the environment, so that the time delay of a link is changed, and the clock synchronization of the radio frequency unit RE and the base station controller REC is influenced.
In any link of a remote base station, a base station controller REC is used as a near-end base station, a radio frequency unit RE is used as a far-end base station, the near-end base station and the far-end base station are respectively provided with a switcher, the near-end base station and the far-end base station are connected through the switcher, and the transmission delay of the link can be changed by the length of wired connection between the switchers; therefore, the clock synchronization between the radio frequency unit RE (far-end base station) and the base station controller REC (near-end base station) can be realized only by measuring the time delay information between the switches in the link as the link time delay of the remote base station.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for measuring the time delay of a remote base station based on auxiliary transceiver equipment.
The purpose of the invention is realized by the following technical scheme: a time delay measuring system of a remote base station based on auxiliary transceiver equipment comprises the remote base station equipment, the auxiliary transceiver equipment and a time delay measuring control center; the time delay measurement control center is respectively communicated with the remote base station equipment and the auxiliary transceiver equipment;
the auxiliary transceiver device comprises a near-end auxiliary transceiver, a far-end auxiliary transceiver, a first switch and a second switch; the remote base station equipment comprises a near-end base station, a far-end base station, a third switcher and a fourth switcher;
the first switch is respectively connected with the transmitting end of the near-end auxiliary transceiver and the receiving end of the near-end base station, the second switch is respectively connected with the receiving end of the far-end auxiliary transceiver and the transmitting end of the far-end base station, and the third switch is respectively connected with the receiving end of the near-end auxiliary transceiver and the transmitting end of the near-end base station; the switch IV is respectively connected with the transmitting end of the far-end auxiliary transceiver and the receiving end of the far-end base station; the first switcher is also connected with the second switcher; the third switcher is also connected with the fourth switcher;
the time delay measurement control center is used for controlling the remote base station equipment and the auxiliary transceiver equipment to carry out delay measurement, receiving feedback measurement information and calculating the link time delay of the remote base station; specifically, the delay measurement control center includes: the signal transceiving control module is used for generating a signal transceiving control command, sending the signal transceiving control command to the near-end auxiliary transceiver, the far-end auxiliary transceiver, the near-end base station and the far-end base station and controlling signal transceiving; the signal switching control module is used for generating a signal switching control instruction, sending the signal switching control instruction to the first switcher, the second switcher, the third switcher and the fourth switcher and controlling the switching of the signals; a transmission delay calculation module, configured to receive, under different signal transceiving control instructions and signal switching control instructions, transceiving time information fed back by the remote base station device and the auxiliary transceiving device, and calculate a transmission delay according to the transceiving time information; and the remote base station link time delay calculation module is used for calculating the link time delay of the remote base station according to the transmission delay calculated under different signal receiving and sending control instructions and signal switching control instructions.
Preferably, the near-end auxiliary transceiver and the near-end base station maintain clock synchronization; the remote auxiliary transceiver and the remote base station maintain clock synchronization.
The time delay measuring method of the time delay measuring system of the remote base station based on the auxiliary transceiver equipment comprises the following substeps:
s1, under the control of a time delay measurement control center, transmitting signals of a near-end auxiliary transceiver pass through a first switch, a second switch, a far-end auxiliary transceiver, a fourth switch and a third switch in sequence and then are transmitted back to the near-end auxiliary transceiver, and the time delay measurement control center calculates and saves a transmission delay m 1;
specifically, the step S1 includes the following sub-steps: s101, under the control of a time delay measurement control center, a transmitting end of a near-end auxiliary transceiver transmits a signal and records a transmitting time t1, and the transmitted signal is received by a receiving end of a far-end auxiliary transceiver after passing through a first switch and a second switch; the transmitting end of the far-end auxiliary transceiver transmits the received signals back to the receiving end of the near-end auxiliary transceiver through the fourth switch and the third switch in sequence, and the near-end auxiliary receiver records the receiving time t 2; s102, the near-end auxiliary transceiver transmits the recorded transmitting time t1 and receiving time t2 to a time delay measurement control center; and S103, the time delay measurement control center obtains the transmission delay m 1-t 2-t1 through calculation and stores the transmission delay m 1-t 2-t 1.
S2, under the control of a time delay measurement control center, a near-end base station and a near-end auxiliary transceiver simultaneously send signals, the signals sent by the near-end base station are sequentially transmitted to a far-end base station through a third switch and a fourth switch, the signals sent by the near-end auxiliary transceiver are transmitted to the far-end auxiliary transceiver through a first switch and a second switch, and a transmission delay difference m2 is calculated and stored by the time delay measurement control center; specifically, the step S2 includes the following sub-steps: s201, under the control of a time delay measurement control center, a near-end base station and a near-end auxiliary transceiver simultaneously send signals; s202, after sequentially passing through a third switch and a fourth switch, a signal transmitted by a transmitting end of a near-end base station is received by a receiving end of a far-end base station, and a receiving time t3 is recorded and transmitted to a time delay measurement control center; s203, after the signal transmitted by the transmitting end of the near-end auxiliary transceiver sequentially passes through the first switch and the second switch, the signal is received by the receiving end of the far-end auxiliary transceiver, the receiving time t4 is recorded, and the signal is transmitted to a time delay measurement control center; and S204, calculating and storing the transmission delay difference m 2-t 4-t3 according to the receiving time of the remote base station and the remote auxiliary transceiver.
S3, under the control of a time delay measurement control center, transmitting a sending signal of the near-end base station to a near-end auxiliary transceiver through a third switcher, and calculating and storing a transmission delay m3 by the time delay measurement control center; specifically, the step S3 includes the following sub-steps: s301, under the control of a time delay measurement control center, a transmitting end of a near-end base station transmits a signal, records a transmitting time t5 and outputs the signal to the time delay measurement control center, the transmitted signal is transmitted to a receiving end of a near-end auxiliary transceiver after passing through a third switcher, and the near-end auxiliary transceiver records a receiving time t6 and transmits the signal to the time delay measurement control center; s302, the time delay measurement control center calculates and stores the transmission delay m 3-t 6-t 5.
S4, under the control of a time delay measurement control center, transmitting a sending signal of the remote auxiliary transceiver to a remote base station through a switch IV, and calculating and storing a transmission delay m4 by the time delay measurement control center; specifically, the step S4 includes the following sub-steps: s401, under the control of a time delay measurement control center, a sending end of a far-end auxiliary transceiver sends a signal, records a sending time t7 and transmits the signal to the time delay measurement control center, the sent signal is transmitted to a receiving end of a far-end base station after passing through a switch IV, and the far-end base station records a receiving time t8 and transmits the signal to the time delay control center; s402, the time delay control center calculates and stores the transmission delay m4 which is t8-t 7.
And S5, the time delay measurement control center calculates the transmission time delay T of the switch three to the switch four, namely (m1+ m2-m3-m4)/2, wherein the transmission time delay is the link time delay of the remote base station.
The invention has the beneficial effects that: the invention uses the near-end auxiliary transceiver, the far-end auxiliary transceiver, the first switcher and the second switcher as auxiliary transceiver equipment to be matched with the remote base station equipment, accurately measures the link time delay of the remote base station under the control of the time delay measurement control center, and provides a basis for the clock synchronization of the far-end base station and the near-end base station.
Drawings
FIG. 1 is a schematic block diagram of the system of the present invention;
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
As shown in fig. 1, a remote base station delay measurement system based on an auxiliary transceiver device includes a remote base station device, an auxiliary transceiver device, and a delay measurement control center; the time delay measurement control center is respectively communicated with the remote base station equipment and the auxiliary transceiver equipment;
the auxiliary transceiver device comprises a near-end auxiliary transceiver, a far-end auxiliary transceiver, a first switch and a second switch; the remote base station equipment comprises a near-end base station, a far-end base station, a third switcher and a fourth switcher;
the first switch is respectively connected with the transmitting end of the near-end auxiliary transceiver and the receiving end of the near-end base station, the second switch is respectively connected with the receiving end of the far-end auxiliary transceiver and the transmitting end of the far-end base station, and the third switch is respectively connected with the receiving end of the near-end auxiliary transceiver and the transmitting end of the near-end base station; the switch IV is respectively connected with the transmitting end of the far-end auxiliary transceiver and the receiving end of the far-end base station; the first switcher is also connected with the second switcher; the third switcher is also connected with the fourth switcher;
the time delay measurement control center is used for controlling the remote base station equipment and the auxiliary transceiver equipment to carry out delay measurement, receiving feedback measurement information and calculating the link time delay of the remote base station; specifically, the delay measurement control center includes: the signal transceiving control module is used for generating a signal transceiving control command, sending the signal transceiving control command to the near-end auxiliary transceiver, the far-end auxiliary transceiver, the near-end base station and the far-end base station and controlling signal transceiving; the signal switching control module is used for generating a signal switching control instruction, sending the signal switching control instruction to the first switcher, the second switcher, the third switcher and the fourth switcher and controlling the switching of the signals; a transmission delay calculation module, configured to receive, under different signal transceiving control instructions and signal switching control instructions, transceiving time information fed back by the remote base station device and the auxiliary transceiving device, and calculate a transmission delay according to the transceiving time information; and the remote base station link time delay calculation module is used for calculating the link time delay of the remote base station according to the transmission delay calculated under different signal receiving and sending control instructions and signal switching control instructions.
The near-end auxiliary transceiver and the near-end base station keep clock synchronization; the remote auxiliary transceiver and the remote base station maintain clock synchronization.
As shown in fig. 2, the method for measuring the delay of the remote base station delay measurement system based on the auxiliary transceiver device includes the following sub-steps:
s1, under the control of a time delay measurement control center, transmitting signals of a near-end auxiliary transceiver pass through a first switch, a second switch, a far-end auxiliary transceiver, a fourth switch and a third switch in sequence and then are transmitted back to the near-end auxiliary transceiver, and the time delay measurement control center calculates and saves a transmission delay m 1;
specifically, the step S1 includes the following sub-steps: s101, under the control of a time delay measurement control center, a transmitting end of a near-end auxiliary transceiver transmits a signal and records a transmitting time t1, and the transmitted signal is received by a receiving end of a far-end auxiliary transceiver after passing through a first switch and a second switch; the transmitting end of the far-end auxiliary transceiver transmits the received signals back to the receiving end of the near-end auxiliary transceiver through the fourth switch and the third switch in sequence, and the near-end auxiliary receiver records the receiving time t 2; s102, the near-end auxiliary transceiver transmits the recorded transmitting time t1 and receiving time t2 to a time delay measurement control center; and S103, the time delay measurement control center obtains the transmission delay m 1-t 2-t1 through calculation and stores the transmission delay m 1-t 2-t 1.
S2, under the control of a time delay measurement control center, a near-end base station and a near-end auxiliary transceiver simultaneously send signals, the signals sent by the near-end base station are sequentially transmitted to a far-end base station through a third switch and a fourth switch, the signals sent by the near-end auxiliary transceiver are transmitted to the far-end auxiliary transceiver through a first switch and a second switch, and a transmission delay difference m2 is calculated and stored by the time delay measurement control center; specifically, the step S2 includes the following sub-steps: s201, under the control of a time delay measurement control center, a near-end base station and a near-end auxiliary transceiver simultaneously send signals; s202, after sequentially passing through a third switch and a fourth switch, a signal transmitted by a transmitting end of a near-end base station is received by a receiving end of a far-end base station, and a receiving time t3 is recorded and transmitted to a time delay measurement control center; s203, after the signal transmitted by the transmitting end of the near-end auxiliary transceiver sequentially passes through the first switch and the second switch, the signal is received by the receiving end of the far-end auxiliary transceiver, the receiving time t4 is recorded, and the signal is transmitted to a time delay measurement control center; and S204, calculating and storing the transmission delay difference m 2-t 4-t3 according to the receiving time of the remote base station and the remote auxiliary transceiver.
S3, under the control of a time delay measurement control center, transmitting a sending signal of the near-end base station to a near-end auxiliary transceiver through a third switcher, and calculating and storing a transmission delay m3 by the time delay measurement control center; specifically, the step S3 includes the following sub-steps: s301, under the control of a time delay measurement control center, a transmitting end of a near-end base station transmits a signal, records a transmitting time t5 and outputs the signal to the time delay measurement control center, the transmitted signal is transmitted to a receiving end of a near-end auxiliary transceiver after passing through a third switcher, and the near-end auxiliary transceiver records a receiving time t6 and transmits the signal to the time delay measurement control center; s302, the time delay measurement control center calculates and stores the transmission delay m 3-t 6-t 5.
S4, under the control of a time delay measurement control center, transmitting a sending signal of the remote auxiliary transceiver to a remote base station through a switch IV, and calculating and storing a transmission delay m4 by the time delay measurement control center; specifically, the step S4 includes the following sub-steps: s401, under the control of a time delay measurement control center, a sending end of a far-end auxiliary transceiver sends a signal, records a sending time t7 and transmits the signal to the time delay measurement control center, the sent signal is transmitted to a receiving end of a far-end base station after passing through a switch IV, and the far-end base station records a receiving time t8 and transmits the signal to the time delay control center; s402, the time delay control center calculates and stores the transmission delay m4 which is t8-t 7.
And S5, the time delay measurement control center calculates the transmission time delay T of the switch three to the switch four, namely (m1+ m2-m3-m4)/2, wherein the transmission time delay is the link time delay of the remote base station.
The invention uses the near-end auxiliary transceiver, the far-end auxiliary transceiver, the first switcher and the second switcher as auxiliary transceiver equipment which are matched with the remote base station equipment, accurately measures the link time delay of the remote base station under the control of the time delay measurement control center, and provides a basis for the clock synchronization of the far-end base station and the near-end base station; specifically, in the embodiments of the present application, it is assumed that:
a transmission delay between the transmitter of the near-end auxiliary transceiver and the first switch is a1, a transmission delay between the first switch and the second switch is a2, a transmission delay between the second switch 2 and the receiver of the far-end auxiliary transceiver is a3, a transmission delay between the transmitter of the far-end auxiliary transceiver and the fourth switch is b3, a transmission delay between the fourth switch and the third switch is b2, a transmission delay between the third switch 3 and the receiver of the near-end auxiliary transceiver is b1, a transmission delay between the transmitter of the near-end base station and the third switch is c1, a transmission delay between the transmitter of the far-end base station and the third switch is c3, a transmission delay between the first switch and the near end is d1, and a transmission delay between the fourth switch and the receiver of the far-end base station is d 3; the transmission delay m1 calculated in step S1 is a1+ a2+ a3+ b1+ b2+ b 3; the transmission delay difference m2, which is calculated in step S2, is c1+ b2+ d 3- (a1+ a2+ a3), and the transmission delay m3, which is calculated in step S3, is b1+ c 1; the transmission delay m4 ═ b3+ d3 calculated in step S4; therefore, the transmission delay T (m1+ m2-m3-m4)/2 (b 2) can be obtained through derivation, and b2 is the transmission delay between the switch four and the switch three, i.e. the link delay of the remote base station, so the accuracy of the measurement method of the present invention can be proved in the derivation process.
In the embodiment of the present application, the first switch and the second switch are generally connected by a wire (optical fiber), and the third switch and the fourth switch are also generally connected by a wire (optical fiber); in the practical application process, after the link time delay is measured according to the method of the invention, the time synchronization is carried out on the far-end base station and the near-end base station in each link according to the link time delay, and the time synchronization among the far-end base stations can be realized; in the embodiment of the present application, the internal delay of each switch, the near-end base station, the far-end base station, the near-end auxiliary transceiver, the far-end auxiliary transceiver and the switch can be calibrated in advance, so the internal delay of each switch is not considered in the present invention.
The foregoing is a preferred embodiment of the present invention, it being understood that the invention is not limited to the form disclosed, but is not intended to be exhaustive or to limit the invention to other embodiments, and to other combinations, modifications, and environments and is capable of modifications within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A system for measuring the time delay of a remote base station based on auxiliary transceiver equipment is characterized in that: the system comprises remote base station equipment, auxiliary transceiver equipment and a time delay measurement control center; the time delay measurement control center is respectively communicated with the remote base station equipment and the auxiliary transceiver equipment;
the auxiliary transceiver device comprises a near-end auxiliary transceiver, a far-end auxiliary transceiver, a first switch and a second switch; the remote base station equipment comprises a near-end base station, a far-end base station, a third switcher and a fourth switcher;
the first switch is respectively connected with the transmitting end of the near-end auxiliary transceiver and the receiving end of the near-end base station, the second switch is respectively connected with the receiving end of the far-end auxiliary transceiver and the transmitting end of the far-end base station, and the third switch is respectively connected with the receiving end of the near-end auxiliary transceiver and the transmitting end of the near-end base station; the switch IV is respectively connected with the transmitting end of the far-end auxiliary transceiver and the receiving end of the far-end base station; the first switcher is also connected with the second switcher; the third switcher is also connected with the fourth switcher;
and the time delay measurement control center is used for controlling the remote base station equipment and the auxiliary transceiver equipment to carry out delay measurement, receiving the feedback measurement information and calculating the link time delay of the remote base station.
2. The system according to claim 1, wherein the system comprises: the near-end auxiliary transceiver and the near-end base station maintain clock synchronization.
3. The system according to claim 1, wherein the system comprises: the remote auxiliary transceiver and the remote base station maintain clock synchronization.
4. The system according to claim 1, wherein the system comprises: the delay measurement control center comprises:
the signal transceiving control module is used for generating a signal transceiving control command, sending the signal transceiving control command to the near-end auxiliary transceiver, the far-end auxiliary transceiver, the near-end base station and the far-end base station and controlling signal transceiving;
the signal switching control module is used for generating a signal switching control instruction, sending the signal switching control instruction to the first switcher, the second switcher, the third switcher and the fourth switcher and controlling the switching of the signals;
a transmission delay calculation module, configured to receive, under different signal transceiving control instructions and signal switching control instructions, transceiving time information fed back by the remote base station device and the auxiliary transceiving device, and calculate a transmission delay according to the transceiving time information;
and the remote base station link time delay calculation module is used for calculating the link time delay of the remote base station according to the transmission delay calculated under different signal receiving and sending control instructions and signal switching control instructions.
5. The method for measuring the time delay of the remote base station time delay measuring system based on the auxiliary transceiver equipment as claimed in any one of claims 1 to 4, wherein: the method comprises the following substeps:
s1, under the control of a time delay measurement control center, transmitting signals of a near-end auxiliary transceiver pass through a first switch, a second switch, a far-end auxiliary transceiver, a fourth switch and a third switch in sequence and then are transmitted back to the near-end auxiliary transceiver, and the time delay measurement control center calculates and saves a transmission delay m 1;
the step S1 includes the following sub-steps:
s101, under the control of a time delay measurement control center, a transmitting end of a near-end auxiliary transceiver transmits a signal and records a transmitting time t1, and the transmitted signal is received by a receiving end of a far-end auxiliary transceiver after passing through a first switch and a second switch; the transmitting end of the far-end auxiliary transceiver transmits the received signals back to the receiving end of the near-end auxiliary transceiver through the fourth switch and the third switch in sequence, and the near-end auxiliary receiver records the receiving time t 2;
s102, the near-end auxiliary transceiver transmits the recorded transmitting time t1 and receiving time t2 to a time delay measurement control center;
s103, the time delay measurement control center obtains and stores transmission delay m 1-t 2-t1 through calculation;
s2, under the control of a time delay measurement control center, a near-end base station and a near-end auxiliary transceiver simultaneously send signals, the signals sent by the near-end base station are sequentially transmitted to a far-end base station through a third switch and a fourth switch, the signals sent by the near-end auxiliary transceiver are transmitted to the far-end auxiliary transceiver through a first switch and a second switch, and a transmission delay difference m2 is calculated and stored by the time delay measurement control center;
the step S2 includes the following sub-steps:
s201, under the control of a time delay measurement control center, a near-end base station and a near-end auxiliary transceiver simultaneously send signals;
s202, after sequentially passing through a third switch and a fourth switch, a signal transmitted by a transmitting end of a near-end base station is received by a receiving end of a far-end base station, and a receiving time t3 is recorded and transmitted to a time delay measurement control center;
s203, after the signal transmitted by the transmitting end of the near-end auxiliary transceiver sequentially passes through the first switch and the second switch, the signal is received by the receiving end of the far-end auxiliary transceiver, the receiving time t4 is recorded, and the signal is transmitted to a time delay measurement control center;
s204, calculating and storing a transmission delay difference m 2-t 4-t3 according to the receiving time of the remote base station and the remote auxiliary transceiver;
s3, under the control of a time delay measurement control center, transmitting a sending signal of the near-end base station to a near-end auxiliary transceiver through a third switcher, and calculating and storing a transmission delay m3 by the time delay measurement control center;
the step S3 includes the following sub-steps:
s301, under the control of a time delay measurement control center, a transmitting end of a near-end base station transmits a signal, records a transmitting time t5 and outputs the signal to the time delay measurement control center, the transmitted signal is transmitted to a receiving end of a near-end auxiliary transceiver after passing through a third switcher, and the near-end auxiliary transceiver records a receiving time t6 and transmits the signal to the time delay measurement control center;
s302, calculating and storing transmission delay m 3-t 6-t5 by a time delay measurement control center;
s4, under the control of a time delay measurement control center, transmitting a sending signal of the remote auxiliary transceiver to a remote base station through a switch IV, and calculating and storing a transmission delay m4 by the time delay measurement control center;
the step S4 includes the following sub-steps:
s401, under the control of a time delay measurement control center, a sending end of a far-end auxiliary transceiver sends a signal, records a sending time t7 and transmits the signal to the time delay measurement control center, the sent signal is transmitted to a receiving end of a far-end base station after passing through a switch IV, and the far-end base station records a receiving time t8 and transmits the signal to the time delay control center;
s402, calculating and storing transmission delay m 4-t 8-t7 by the time delay control center;
and S5, the time delay measurement control center calculates the transmission time delay T of the switch three to the switch four, namely (m1+ m2-m3-m4)/2, wherein the transmission time delay is the link time delay of the remote base station.
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