CN115499907A - Bidirectional high-precision time synchronization control method based on 5G air interface - Google Patents
Bidirectional high-precision time synchronization control method based on 5G air interface Download PDFInfo
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- CN115499907A CN115499907A CN202210852929.1A CN202210852929A CN115499907A CN 115499907 A CN115499907 A CN 115499907A CN 202210852929 A CN202210852929 A CN 202210852929A CN 115499907 A CN115499907 A CN 115499907A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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Abstract
The invention discloses a bidirectional high-precision time synchronization control method based on a 5G air interface, which comprises a site A, a site B, a base station A, a base station B and a server, wherein the site A consists of a local clock A and a 5G bidirectional time service module, the site A is in wireless communication connection with the base station A through a 5G signal, the site B consists of a local clock B and a 5G bidirectional time service module, the site B is in wireless communication connection with the base station B through a 5G signal, both the base station A and the base station B are connected with the server, and the site B controls the local clock through processing time information so as to synchronize the time of the site B and the site A; the invention transmits information to the opposite side through the 5G base station, so that the paths passed by the information are approximately symmetrical, the time delay error from the time source to the base station can be offset and a part of the time lead can be offset, thereby ensuring the high-precision time comparison precision, and the multi-scene time comparison can be carried out based on the wide coverage capability of the 5G base station.
Description
Technical Field
The invention relates to the technical field of time frequency, in particular to a bidirectional high-precision time synchronization control method based on a 5G air interface.
Background
The time frequency synchronization technology is an important technology in the time frequency field, and obtains time synchronization of two places by comparing time frequency deviation of the two places. The traditional time-frequency comparison has time service technology, such as short-wave time service, long-wave time service network time service and the like. The time service precision of the technologies is at most in the microsecond order. At present, a high-precision time frequency comparison technology is mainly realized based on a satellite, for example, satellite bidirectional time frequency comparison, satellite common-view time frequency comparison, satellite full-view time frequency comparison and the like, and time service precision is superior to 10ns;
the existing time frequency comparison technology based on a satellite navigation system has certain limitations, the signal vulnerability of the navigation system is easy to interfere and shield; the user side is restricted by observation conditions, and satellite signal receiving equipment needs to be arranged on the user side, so that the user cost is additionally increased; the constraint on the observation environment is increased, and the multi-scene user requirement is not utilized.
For example, chinese patent CN 202010010010249.6 discloses a method for time synchronization between base stations, a time synchronization apparatus, and an electronic device. Locking a second base station group through a strategy system, and issuing and adjusting the time difference to the second base station group according to a preset synchronization strategy to perform clock synchronization according to synchronization information of the first base station group and the second base station group in a time period between a timestamp for synchronizing the tag device and the current time of the tag device, so that the synchronization between the first base station group and the second base station group is unrelated to the absolute time of the first base station group or the second base station group and is only related to the time difference of the tag device, and the time synchronization between the first base station group and the second base station group is prevented from being influenced by the time delay of wireless network transmission; the comparison mode still has certain limitation, and a label device needs to be arranged independently, so that the cost is high.
Disclosure of Invention
The invention mainly solves the problem that the time frequency comparison technology based on the satellite navigation system in the prior art has limitation; the bidirectional high-precision time synchronization control method based on the 5G air interface is provided, the high-precision time comparison precision is guaranteed, and the time synchronization of different stations is realized.
The technical problem of the invention is mainly solved by the following technical scheme: a bidirectional high-precision time synchronization control method based on a 5G air interface comprises a site A, a site B, a base station A, a base station B and a server, wherein the site A is composed of a local clock A and a 5G bidirectional time service module, the site A is in wireless communication connection with the base station A through a 5G signal, the site B is composed of a local clock B and a 5G bidirectional time service module, the site B is in wireless communication connection with the base station B through a 5G signal, the base station A and the base station B are both connected with the server, and the site B controls the local clock through processing of time information so as to synchronize the time of the site B and the site A; the 5G bidirectional time service module comprises a radio frequency module, a baseband module, a counter and a data processing module, wherein the radio frequency module, the baseband module and the counter are all connected with the data processing module, the radio frequency module receives or sends a 5G signal, and the baseband module analyzes the 5G signal and outputs 5G air interface time NR A And time information Δ T of station B B The counter is accessed to 5G air interface time NR A And local clock aTime LC A Outputting the time difference Delta T of the local clock A A The data processing module processes the time information, and outputs control information of a local clock according to the difference value of a site A clock and a site B clock so as to control the site A clock; the method comprises the following steps:
the method comprises the following steps: the site A receives signals of the base station A, including an air interface time service signal NR A And a time signal Δ T from said station B B The local clock A of said station A generating a time signal LC A The air interface time service signal NR A And a local clock A of said station A generating a time signal LC A Is connected with the counter;
step two: the signals received by the station B from the base station B comprise air interface time service signals NR B And a time signal Δ T from said station A A A local clock B of said station B generating a time signal LC B The air interface time service signal NR B And a local clock B of said station B generates a time signal LC B Connecting the counter;
step three: 5G air interface time information NR T Respectively from the base station a and the base station B;
step four: the station A obtains the time difference information delta T of the station B B The calculation formula is as follows:
ΔT A -ΔT B ＝(LC A -NR A )-(LC B -NR B )＝(LC A -LC B )-(NR A -NR B )；
step five: the station A obtains clock deviation information DeltaLC with the station B AB The calculation formula is as follows:
ΔLC AB ＝LC A -LC B ＝ΔT A -ΔT B +(NR A -NR B )＝ΔT A -ΔT B +ΔNR AB
wherein, Δ NR AB Is a constant;
step six: clock deviation Δ LC from station B obtained by station a from step five AB And controlling the local clock A to be synchronized with the site B according to the time difference.
Preferably, the station a sends the time information to the base station B sequentially through the base station a and the server, and sends the time information to the station B through the base station B.
Preferably, the counter in the first step outputs the time difference of two time signals, which is expressed as:
ΔT A ＝LC A -NR A 。
preferably, in the second step, the time difference between the two time signals output by the counter is represented as:
ΔT B ＝LC B -NR B 。
preferably, in step three, the base station a and the base station B respectively transmit 5G air interface time information NR T For site a and site B, there are:
NR A ＝NR T +ΔNR TA ；
NR B ＝NR T +ΔNR TB ；
since the path from the base station a to the site a is different from the path from the base station B to the site B, the path delay Δ NR from the base station a to the site a is caused to be different TA And a path delay delta NR from the base station B to the site B TB Also different, namely:
ΔNR TA ≠ΔNR TB ；
in order to obtain the 5G air interface time difference of the site A and the site B, the following steps are carried out:
NR A -NR B ＝ΔNR TA -ΔNR TB ；
let Δ NR TA -ΔNR TB ＝ΔNR AB Obtaining:
ΔNR AB ＝NR A -NR B 。
preferably, all three of the station a and the station B belong to a static state.
Preferably, Δ T in step five A Is a measure of the output of station A, Δ T B Is the station B measurements received by the station a.
The invention has the beneficial effects that: (1) The information is forwarded to the opposite side through the 5G base station, so that the paths passed by the information are approximately symmetrical, the time delay error from the time source to the base station can be offset, and a part of time lead can be offset, so that the high-precision time comparison precision is ensured, the dense 5G base station has a transceiving function and a low-cost 5G mobile terminal, and the indoor and outdoor multi-scene time comparison can be carried out based on the wide coverage capability of the 5G base station; (2) The 5G bidirectional time service module is arranged for processing, the radio frequency module is used for receiving and sending 5G signals, the baseband module is used for analyzing the 5G signals, and the counter outputs the time difference delta T of the local clock A A The data processing module processes the time informationThen, the difference value DeltaLC of the site A clock and the site B clock is obtained AB And outputting local clock control information to control the clock of the site A and realize the time synchronization of the site A clock and the site B clock.
Drawings
Fig. 1 is a schematic diagram of a bidirectional time comparison of a 5G air interface based on a bidirectional high-precision time synchronization control method of the 5G air interface according to the present invention.
Fig. 2 is a schematic diagram of a 5G bidirectional time service module of a bidirectional high-precision time synchronization control method based on a 5G air interface according to the present invention.
In the figure, 101, sites a and 102, base stations a and 103, servers and 104, base stations B and 105, sites B and 106, radio frequency modules and 107, baseband modules and 108, counters and 109 and data processing modules are arranged.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the features in the following embodiments and examples may be combined with each other without conflict.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention are further described in detail by the following embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The embodiment is as follows: a bidirectional high-precision time synchronization control method based on a 5G air interface is disclosed, as shown in fig. 1 and fig. 2, and comprises a station A101, a station B105, a base station A102, a base station B104 and a server 103, wherein the station A is composed of a local clock A and a 5G bidirectional time service module, in order to enable the station A to search the base station A providing service, the station A is in wireless communication connection with the base station A through a 5G signal, the station B is composed of a local clock B and a 5G bidirectional time service module, in order to enable the station B to search the base station B providing service, the station B is in wireless communication connection with the base station B through a 5G signal, the station A sends time information to the base station B sequentially through the base station A and the server, and sends the time information to the station B through the base station B, and the station B controls the local clock through processing of the time information, and further synchronizes the time of the station B and the station A.
The 5G bidirectional time service module processing steps of the site A and the site B are as follows:
the method comprises the following steps: the signals received by the site A from the base station A comprise an air interface time service signal NR A And a time signal Δ T from site B B The local clock A of the station A generating a time signal LC A The air interface time service signal NR A And the local clock A of the station A generates a time signal LC A A counter is connected, which outputs the time difference of two time signals, expressed as:
the formula I is as follows: delta T A ＝LC A -NR A ；
Step two: the signals received by the site B from the base station B comprise an air interface time service signal NR B And a time signal Δ T from site A A The local clock B of station B generates a time signal LC B The air interface time service signal NR B The local clock B of the station B generates a time signal LC B A counter is connected, which outputs the time difference of two time signals, expressed as:
the formula II is as follows: delta T B ＝LC B -NR B ；
Step three: 5G air interface time information NR T Respectively, from base station a and base station B, which are communicated to station a and station B, respectively, i.e.:
the formula III is as follows: NR (nitrogen to noise ratio) A ＝NR T +ΔNR TA ；
The formula four is as follows: NR (nitrogen to noise ratio) B ＝NR T +ΔNR TB ；
Because the path from the base station A to the station A is different from the path from the base station B to the station B, the path delay delta NR from the base station A to the station A is caused TA Path delay from base station B to site B, Δ NR TB Also different, namely:
the formula five is as follows: Δ NR TA ≠ΔNR TB ；
In order to obtain the 5G air interface time difference of the site A and the site B, subtracting a formula IV from a formula III:
formula six: NR A -NR B ＝ΔNR TA -ΔNR TB ；
Let Δ NR TA -ΔNR TB ＝ΔNR AB And finishing a formula six:
the formula is seven: Δ NR AB ＝NR A -NR B ；
For static site A and static site B, Δ NR AB Is a constant;
step four: the station A obtains the time difference information Delta T of the station B B And the formula I, the formula II and the formula VII are collated to obtain:
the formula eight: delta T A -ΔT B ＝(LC A -NR A )-(LC B -NR B )＝(LC A -LC B )-(NR A -NR B )；
Step five: station A obtains clock deviation information DeltaLC from station B AB (LC) in equation eight A -LC B ) Moving to the left of the equation, Δ T A -ΔT B Moving to the right of the equation, we get:
the formula is nine: delta LC AB ＝LC A -LC B ＝ΔT A -ΔT B +(NR A -NR B )＝ΔT A -ΔT B +ΔNR AB ；
In the formula,. DELTA.T A Is a measure of the output of station A, Δ T B The measured value of the station B received by the station A is obtained, and the clock deviation of the station A and the clock deviation of the station B can be obtained through a formula V;
step six: clock deviation Δ LC from station B obtained by station a from step five AB And controlling the local clock A to be synchronized with the site B according to the time difference.
The 5G bidirectional time service module comprises a radio frequency module 106, a baseband module 107, a counter 108 and a data processing module 109, wherein the radio frequency module receives or sends a 5G signal, the baseband module analyzes the 5G signal and outputs 5G air interface time NR A And time information Δ T of station B B The counter is accessed to the 5G air interface time NR A And local clock A time LC A Output local clock A time difference DeltaT A The data processing module processes the time information and obtains the difference value Delta LC of the clock of the station A and the clock of the station B according to a formula eight and a formula nine AB And outputting the control information of the local clock so as to control the clock of the site A.
In order to compare the time of station a with the time of station B, station a measuring the time difference with station B, station B measuring the time difference with station a, comprising the steps of:
a1: the signals received by the site A from the base station A comprise an air interface time service signal NR A And a time signal Δ T from site B B The local clock A of the station A generating a time signal LC A The air interface time service signal NR A And the local clock A of the station A generates a time signal LC A A counter is connected and outputs the time difference delta T of two time signals A ；
a2: the signals of the base station B received by the station B comprise air interface time service signals NR B And a time signal Δ T from site A A The local clock B of station B generates a time signal LC B The air interface time service signal NR B The local clock B of the station B generates a time signal LC B A counter is connected, and the time difference Delta T of the two time signals output by the counter B ；
a3: site A obtains clock bias information DeltaLC from site B AB Namely:
ΔLC AB ＝LC A -LC B ＝ΔT A -ΔT B +ΔNR AB ；
a4: site A obtains clock bias DeltaLC from site B AB ；
a5: station B obtains clock deviation information DeltaLC from station A BA Namely:
ΔLC BA ＝LC B -LC A ＝ΔT B -ΔT A +ΔNR BA ；
a6: site B obtains clock offset Δ LC from site a BA 。
In order to enable the time between the site A and the site B to be synchronized bidirectionally, the time performance of the site A is similar to that of the site B, and the time of the site A is synchronized with that of the site B through 5G bidirectional time-frequency comparison, the method comprises the following steps: b1: the signals received by the site A from the base station A comprise an air interface time service signal NR A And a time signal Δ T from site B B The local clock A of the station A generates a time signal LC A The air interface time service signal NR A And the local clock A of the station A generates a time signal LC A A counter is connected, and the time difference Delta T of the two time signals output by the counter A ；
b2: the signals of the base station B received by the station B comprise air interface time service signals NR B And a time signal Δ T from site A A The local clock B of the station B generates a time signal LC B The air interface time service signal NR B The local clock B of the station B generates a time signal LC B A counter is connected and outputs the time difference delta T of two time signals B ；
b3: site A obtains clock bias information DeltaLC from site B AB Namely:
ΔLC AB ＝LC A -LC B ＝ΔT A -ΔT B +ΔNR AB ；
b4: site A obtains clock bias DeltaLC from site B AB And further controlling the local clock to be synchronous with the site B according to the time difference;
b5: station B obtains clock offset information Δ LC from station a BA Namely:
ΔLC BA ＝LC B -LC A ＝ΔT B -ΔT A +ΔNR BA ；
b6: site B obtains clock offset Δ LC from site a BA And further controlling the local clock to be synchronous with the site A according to the time difference.
In order to make the time performance of the station B higher than that of the station A when the station A gives time to the station B, the method transmits the time of the station B to the station A, and comprises the following steps:
c1: site A receives signals of base station A and comprises air interface time service informationNumber NR A And a time signal Δ T from site B B The local clock A of the station A generating a time signal LC A Null timing signal NR A And the local clock A of the station A generates a time signal LC A A counter is connected, and the time difference Delta T of the two time signals output by the counter A ；
c2: the signals received by the site B from the base station B comprise an air interface time service signal NR B And a time signal Δ T from site A A The local clock B of the station B generates a time signal LC B Null timing signal NR B And the local clock B of station B generates a time signal LC B A counter is connected and outputs the time difference delta T of two time signals B ；
c3: site A obtains clock bias information DeltaLC from site B AB Namely:
ΔLC AB ＝LC A -LC B ＝ΔT A -ΔT B +ΔNR AB ；
c4: site A obtains clock bias DeltaLC from site B AB And further controlling the local clock to be synchronous with the site B according to the time difference.
According to the principle of 5G communication, a terminal has the functions of information sending and receiving, a user terminal can send local time to the other side and also can receive the time of the other side from the other side, therefore, the function of mutually sending and mutually giving time and frequency information between two places can be realized, meanwhile, the fixity of the 5G base station also ensures that the paths passed by signals sent by the site A and the site B are highly similar, and because the two stations are subjected to bidirectional comparison and forward the information to the other side through the 5G base station, the paths passed by the information are approximately symmetrical, and the signal path delay and the delay of the 5G base station can be eliminated by subtracting the time of the two users, thereby achieving the purpose of high-precision time and frequency synchronous transmission.
The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.
Claims (7)
1. A bidirectional high-precision time synchronization control method based on a 5G air interface is characterized by comprising the following steps:
the system comprises a site A, a site B, a base station A, a base station B and a server, wherein the site A consists of a local clock A and a 5G bidirectional time service module, the site A is in wireless communication connection with the base station A through a 5G signal, the site B consists of a local clock B and a 5G bidirectional time service module, the site B is in wireless communication connection with the base station B through a 5G signal, the base station A and the base station B are both connected with the server, and the site B controls the local clock through processing time information so as to synchronize the time of the site B and the site A;
the 5G bidirectional time service module comprises a radio frequency module, a baseband module, a counter and a data processing module, wherein the radio frequency module, the baseband module and the counter are all connected with the data processing module, the radio frequency module receives or sends a 5G signal, and the baseband module analyzes the 5G signal and outputs 5G air interface time NR A And time information Δ T of station B B The counter is accessed to 5G air interface time NR A And local clock A time LC A Outputting the time difference Delta T of the local clock A A The data processing module processes the time information, and outputs control information of a local clock according to the difference value of a site A clock and a site B clock so as to control the site A clock; the method comprises the following steps:
the method comprises the following steps: the site A receives signals of the base station A, including an air interface time service signal NR A And a time signal Δ T from said station B B The local clock A of said station A generates a time signal LC A The air interface time service signal NR A And a local clock A of said station A generating a time signal LC A Is connected with the counter;
step two: the signals received by the station B from the base station B comprise air interface time service signals NR B And a time signal Δ T from said station A A A local clock B of said station B generating a time signal LC B The air interface time service signal NR B And a local clock B of said station B generating a time signal LC B Connecting the counter;
step three: 5G air interface time information NR T Respectively from the base station a and the base station B;
step four: the station A obtains the time difference information delta T of the station B B The calculation formula is as follows:
ΔT A -ΔT B ＝(LC A -NR A )-(LC B -NR B )
＝(LC A -LC B )-(NR A -NR B )；
step five: the station A obtains clock deviation information DeltaLC with the station B AB The calculation formula is as follows:
ΔLC AB ＝LC A -LC B ＝ΔT A -ΔT B +(NR A -NR B )
＝ΔT A -ΔT B +ΔNR AB
wherein, Δ NR AB Is a constant;
step six: clock deviation Δ LC from station B obtained by station a from step five AB And controlling the local clock A to be synchronized with the site B according to the time difference.
2. The method according to claim 1, wherein the station a sends the time information to the station B sequentially through the base station a and the server, and sends the time information to the station B through the base station B.
3. The method for controlling bidirectional high-precision time synchronization over a 5G air interface according to claim 1 or 2, wherein the control unit is configured to control the time synchronization over the air interface according to the control command,
the counter in the first step outputs the time difference of two time signals, which is expressed as:
ΔT A ＝LC A -NR A 。
4. the method for controlling bidirectional high-precision time synchronization over a 5G air interface according to claim 1 or 2, wherein the control unit is configured to control the time synchronization over the air interface according to the control command,
in the second step, the time difference of the two time signals output by the counter is expressed as:
ΔT B ＝LC B -NR B 。
5. the method according to claim 1, wherein in step three, the base station a and the base station B respectively transfer 5G air interface time information NR T For site a and site B, there are:
NR A ＝NR T +ΔNR TA ；
NR B ＝NR T +ΔNR TB ；
since the path from the base station a to the site a is different from the path from the base station B to the site B, the path delay Δ NR from the base station a to the site a is caused to be different TA And a path delay Delta NR from the base station B to the site B TB Also different, namely:
ΔNR TA ≠ΔNR TB ；
in order to obtain the 5G air interface time difference between the site A and the site B, the following steps are carried out:
NR A -NR B ＝ΔNR TA -ΔNR TB ；
let Δ NR TA -ΔNR TB ＝ΔNR AB Obtaining:
ΔNR AB ＝NR A -NR B 。
6. the method according to claim 5, wherein in step three of the station A and the station B are static.
7. The method according to claim 1, wherein Δ T in step five is a delta T with high precision based on 5G air interface A Is a measured value, Δ T, output by site A B Is the station B measurements received by the station a.
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