CN111614425B - Time synchronization method and access network equipment - Google Patents
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- 238000013507 mapping Methods 0.000 claims description 90
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- 238000012545 processing Methods 0.000 claims description 22
- 238000004590 computer program Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000001360 synchronised effect Effects 0.000 description 7
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- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
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- 238000010295 mobile communication Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
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- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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Abstract
The embodiment of the invention discloses a time synchronization method and access network equipment. The method comprises the following steps: the access network equipment receives message data of a terminal; and if the message data is used for requesting time synchronization, acquiring time synchronization information based on the message data, and sending the time synchronization information to the terminal.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a time synchronization method and an access network device.
Background
With the development of the fifth generation mobile communication technology (5G) and the narrowband Internet of Things (NB-IOT, narrow Band-Internet of Things), the number of mobile communication access devices will increase greatly in the future, the terminal has various service requirements such as finance and positioning, and different services have different requirements and specifications for synchronization accuracy, so that a high-accuracy time synchronization scheme is provided to become the development requirement of the future terminal time synchronization technology.
Currently, network Time synchronization protocols mainly include Precision Time Protocol (PTP) and Network Time Protocol (NTP). The PTP protocol requires a network intermediate node to increase a timestamp through hardware, so that the cost of the terminal is increased, and the existing terminal cannot support the PTP protocol. The NTP protocol requires the access terminal to communicate with the NTP server in the core network, and because the NTP protocol synchronization accuracy is limited by the scale of the network, the synchronization accuracy is low if the scale of the network between the access terminal and the time server is large, and on the other hand, the access terminal is increased, and a large number of terminals communicate with the NTP server to consume network resources, which easily causes the load of the time server to be too large.
Disclosure of Invention
In order to solve the existing technical problem, embodiments of the present invention provide a time synchronization method and an access network device.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is implemented as follows:
the embodiment of the invention provides a time synchronization method, which comprises the following steps:
the access network equipment receives message data of a terminal;
and if the message data is used for requesting time synchronization, acquiring time synchronization information based on the message data, and sending the time synchronization information to the terminal.
In the above scheme, the method further comprises: the access network equipment establishes a mapping relation between first address information of the access network equipment and second address information of the NTP server to generate a mapping relation set.
In the foregoing solution, the obtaining time synchronization information based on the packet data includes: analyzing the message data to obtain destination address information in the message data; inquiring whether the mapping relation set contains the destination address information or not; and when the mapping relation set comprises the destination address information, obtaining time synchronization information.
In the foregoing solution, the obtaining time synchronization information based on the packet data includes: analyzing the message data to obtain destination address information in the message data; inquiring whether the mapping relation set contains the destination address information or not; and when the mapping relation set does not contain the destination address information, sending the message data to other NTP servers based on the destination address information to obtain time synchronization information fed back by the other NTP servers.
In the foregoing solution, the method further includes: and adding the mapping relation between the first address information of the access network equipment and the address information of the other NTP servers to the mapping relation set.
The embodiment of the invention also provides access network equipment, which comprises a communication unit and a message processing unit; wherein,
the communication unit is used for receiving message data of the terminal;
the message processing unit is used for acquiring time synchronization information based on the message data if the message data is used for requesting time synchronization;
the communication unit is further configured to send the time synchronization information to the terminal.
In the foregoing solution, the access network device further includes a mapping unit, configured to establish a mapping relationship between first address information of the access network device itself and second address information of the NTP server, and generate a mapping relationship set.
In the above scheme, the message processing unit is configured to analyze the message data to obtain destination address information in the message data; inquiring whether the mapping relation set generated by the mapping unit contains the destination address information or not; and when the mapping relation set comprises the destination address information, obtaining time synchronization information.
In the above scheme, the message processing unit is configured to analyze the message data to obtain destination address information in the message data; inquiring whether the mapping relation set contains the destination address information or not;
and the communication unit is further configured to, when the message processing unit determines that the mapping relationship set does not include the destination address information, send the message data to other NTP servers based on the destination address information, and obtain time synchronization information fed back by the other NTP servers.
In the foregoing solution, the mapping unit is further configured to add a mapping relationship between the first address information of the access network device itself and the address information of the other NTP servers to the mapping relationship set.
Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the method according to an embodiment of the present invention.
An access network device according to an embodiment of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to the embodiment of the present invention when executing the computer program.
The time synchronization method and the access network device provided by the embodiment of the invention comprise the following steps: the access network equipment receives message data of a terminal; and if the message data is used for requesting time synchronization, acquiring time synchronization information based on the message data, and sending the time synchronization information to the terminal. By adopting the technical scheme of the embodiment of the invention, the NTP time synchronization service is provided for the terminal through the access network equipment (such as a base station), the NTP synchronization precision is improved, the load of an NTP server is greatly reduced, no additional hardware equipment is required to be added, and the cost of the terminal is not required to be improved.
Drawings
FIG. 1 is a flow chart of a time synchronization method according to an embodiment of the present invention;
FIG. 2 is a schematic interaction flow diagram of a time synchronization method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an access network device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another component of the access network device according to the embodiment of the present invention;
fig. 5 is a schematic diagram of a hardware component structure of an access network device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a time synchronization method. FIG. 1 is a flow chart of a time synchronization method according to an embodiment of the present invention; as shown in fig. 1, the method includes:
step 101: the access network equipment receives message data of the terminal.
Step 102: and if the message data is used for requesting time synchronization, acquiring time synchronization information based on the message data, and sending the time synchronization information to the terminal.
In this embodiment, the access network device may provide communication coverage for a specific geographic area and communicate with terminals within the communication coverage. As an example, the access network device may be a base station in various communication systems, such as an evolved node b (eNB) in a Long Term Evolution (LTE) system, and so on; the communication system may be any mobile communication system today.
The access network equipment can locally provide NTP time synchronization service for the terminal. In practical applications, a time source obtaining component may be disposed in the access network device, and the time synchronization information may be obtained through the obtaining component. In one embodiment, the access network device communicates with a PTP server and obtains time synchronization information from the PTP server.
In an optional embodiment of the invention, the method further comprises: the access network equipment establishes a mapping relation between first address information of the access network equipment and second address information of an NTP server to generate a mapping relation set;
in one embodiment, the access network device sends a proxy request to an NTP server; the proxy request is used for requesting proxy time synchronization service; and after receiving the confirmation information corresponding to the proxy request, establishing a mapping relation between the first address information of the access network equipment and the second address information of the NTP server.
Wherein, the first address information may include an Internet Protocol (IP) address and a User Datagram Protocol (UDP) port number of the access network device; the second address information may include an IP address and a UDP port number of the NTP server, as shown in table 1. It is understood that a mapping table shown in table 1, which includes address information of the NTP server and address information of the access network device itself, is maintained in the access network device to implement address mapping of the NTP server, and time synchronization service is implemented based on the mapping table.
TABLE 1
| NTP server IP A; UDP port number 123 | A base station IP; UDP Port number 1 |
| NTP server IP B; UDP port number 123 | A base station IP; UDP port number 2 |
| …… | …… |
| NTP server IP X; UDP port number 123 | A base station IP; UDP port number 3 |
In an embodiment, to avoid the shortage of the UDP port number, the access network device manages the mapping relationship set periodically or aperiodically, and specifically, may delete at least one mapping relationship in the mapping relationship set.
As an embodiment, the managing the set of mapping relationships may be initializing the set of mapping relationships; for example, the mapping relationship set is initialized at intervals, so that the mapping relationships in the mapping relationship set are all the mapping relationships commonly used in the period.
As another embodiment, the managing the mapping relationship set may be sorting the mapping relationships in the mapping relationship set from large to small according to existence duration, and deleting the mapping relationships with long existence times (for example, existence duration is greater than a first preset threshold).
In yet another embodiment, the managing the mapping relationship set may be counting utilization rates of mapping relationships in the mapping relationship set, and deleting a mapping relationship with a low utilization rate (for example, a utilization rate less than a second preset threshold value).
In an optional embodiment of the present invention, the obtaining time synchronization information based on the packet data includes: analyzing the message data to obtain destination address information in the message data; inquiring whether the mapping relation set contains the destination address information or not; and when the mapping relation set comprises the destination address information, obtaining time synchronization information.
In this embodiment, the newly added IP packet processing component in the access network device is configured to decapsulate packet data from the terminal, identify destination address information in the packet data, specifically, identify a transport layer port number (e.g., UDP port number) in the packet data, and perform time synchronization processing on packet data corresponding to a UDP port number in a set where the UDP port number satisfies a mapping relationship; and processing the message data corresponding to the UDP port number which does not meet the mapping relation set according to a conventional message data flow. And further acquiring time synchronization information for the message data corresponding to the UDP port number meeting the UDP port number in the mapping relation set, packaging the time synchronization information in the message data, and sending the message data to the terminal through an air interface. Specifically, the IP address and UDP port number of the base station in the message are demapped to the IP address and UDP port number of the corresponding NTP server, and sent to the terminal through the air interface.
In an optional embodiment of the present invention, the obtaining time synchronization information based on the packet data includes: analyzing the message data to obtain destination address information in the message data; inquiring whether the mapping relation set contains the destination address information or not; and when the mapping relation set does not contain the destination address information, sending the message data to other NTP servers based on the destination address information to obtain time synchronization information fed back by the other NTP servers.
In this embodiment, the message data corresponding to the UDP port number that does not satisfy the mapping relationship set is processed according to a conventional message data flow, that is, data transmission is performed according to destination address information (for example, a destination IP address and a UDP port number) carried in the message data; and when the destination address information carried in the message data corresponds to other NTP servers, the access network equipment sends the destination address information carried in the message data to other NTP servers so as to provide time synchronization service through other NTP servers and obtain the time synchronization information fed back by other NTP servers.
In an optional embodiment of the invention, the method further comprises: and adding the mapping relationship between the first address information of the access network equipment and the address information of the other NTP servers to the mapping relationship set.
In this embodiment, if the mapping relationship set does not include address information corresponding to other NTP servers carried in the packet data, the access network device adds the mapping relationship between the first address information of the access network device and the address information of the other NTP servers to the mapping relationship set to update the mapping relationship set.
By adopting the technical scheme of the embodiment of the invention, the NTP time synchronization service is provided for the terminal through the access network equipment (such as a base station), the NTP synchronization precision is improved, the load of an NTP server is greatly reduced, no additional hardware equipment is required to be added, and the cost of the terminal is not required to be improved.
The embodiment of the invention also provides a time synchronization method. FIG. 2 is a schematic interaction flow diagram of a time synchronization method according to an embodiment of the present invention; in this embodiment, the access network device takes a base station as an example for description, and as shown in fig. 2, the method includes:
step 201: the base station sends an NTP proxy request to an NTP server A;
step 202: the NTP server A feeds back a proxy success message to the base station and multicasts synchronous information to the base station regularly or irregularly;
step 203: the base station establishes a mapping relation between an IP address and a UDP port number of the base station and an IP address and a UDP port of the NTP server A, and generates a mapping table, namely the IP address and the UDP port number of the NTP server A are mapped into the IP address and the UDP port number of the base station;
step 204: a terminal sends a time synchronization request to a base station;
step 205a: the base station analyzes the time synchronization request to obtain destination address information, for example, an IP address and/or a UDP port number contained in the destination address; inquiring the mapping table, determining that the destination address information exists in the mapping table, and determining the time synchronization information by the base station if the time synchronization service of the NTP server A corresponding to the destination address is proxied by the base station;
step 205b: the base station forwards the target address information in the time synchronization request to an NTP server B to obtain time synchronization information fed back by the NTP server B;
step 206: the base station transmits time synchronization information to the terminal.
By adopting the technical scheme of the embodiment of the invention, the NTP time synchronization service is provided for the terminal through the access network equipment (such as a base station), the NTP synchronization precision is improved, the load of an NTP server is greatly reduced, no additional hardware equipment is required to be added, and the cost of the terminal is not required to be improved.
The embodiment of the invention also provides access network equipment. Fig. 3 is a schematic structural diagram of an access network device according to an embodiment of the present invention; as shown in fig. 3, the access network device includes a communication unit and a message processing unit; wherein,
the communication unit 31 is configured to receive message data of a terminal;
the message processing unit 32 is configured to obtain time synchronization information based on the message data if the message data is used for requesting time synchronization;
the communication unit 31 is further configured to send the time synchronization information to the terminal.
In an optional embodiment of the present invention, as shown in fig. 4, the access network device further includes a mapping unit 33, configured to establish a mapping relationship between the first address information of the access network device itself and the second address information of the NTP server, and generate a mapping relationship set.
In an optional embodiment of the present invention, the message processing unit 32 is configured to analyze the message data to obtain destination address information in the message data; inquiring whether the mapping relation set generated by the mapping unit 33 contains the destination address information; and when the mapping relation set comprises the destination address information, obtaining time synchronization information.
In an optional embodiment of the present invention, the message processing unit 32 is configured to analyze the message data to obtain destination address information in the message data; inquiring whether the mapping relation set contains the destination address information or not;
the communication unit 31 is further configured to, when the message processing unit 32 determines that the mapping relationship set does not include the destination address information, send the message data to other NTP servers based on the destination address information, and obtain time synchronization information fed back by the other NTP servers.
In an optional embodiment of the present invention, the mapping unit 33 is further configured to add a mapping relationship between the first address information of the access network device itself and the address information of the other NTP server to the mapping relationship set.
In the embodiment of the present invention, the message Processing Unit 32 and the mapping Unit 33 in the access network device may be implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), a Micro Control Unit (MCU), or a Programmable Gate Array (FPGA) in the access network device in actual application; the communication unit 31 in the access network device can be implemented in practical applications by a communication module (including a basic communication suite, an operating system, a communication module, a standardized interface, a protocol, etc.) and a transceiver antenna.
It should be noted that: in the foregoing embodiment, when performing time synchronization, the access network device is exemplified by only dividing the program modules, and in practical applications, the processing may be distributed to different program modules according to needs, that is, the internal structure of the access network device is divided into different program modules to complete all or part of the processing described above. In addition, the access network device and the time synchronization method provided in the foregoing embodiments belong to the same concept, and specific implementation processes thereof are described in the method embodiments in detail and are not described herein again.
Fig. 5 is a schematic diagram of a hardware structure of the access network device according to the embodiment of the present invention, as shown in fig. 5, the access network device includes a memory 42, a processor 41, and a computer program stored in the memory 42 and capable of running on the processor 41, and when the processor 41 executes the computer program, the steps of the time synchronization method according to the embodiment of the present invention are implemented.
It will be appreciated that the access network equipment also includes a communication interface 43. The various components in the access network device may be coupled together by a bus system 44. It will be appreciated that the bus system 44 is used to enable communications among the components of the connection. The bus system 44 includes a power bus, a control bus, and a status signal bus in addition to the data bus. For clarity of illustration, however, the various buses are labeled as bus system 44 in fig. 5.
It will be appreciated that the memory 42 can be either volatile memory or nonvolatile memory, and can include both volatile and nonvolatile memory. Among them, the nonvolatile Memory may be a Read Only Memory (ROM), a Programmable Read Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), an Electrically Erasable Programmable Read-Only Memory (EEPROM), a magnetic random access Memory (FRAM), a Flash Memory (Flash Memory), a magnetic surface Memory, an optical Disc, or a Compact Disc Read-Only Memory (CD-ROM); the magnetic surface storage may be disk storage or tape storage. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of illustration and not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), synchronous Static Random Access Memory (SSRAM), dynamic Random Access Memory (DRAM), synchronous Dynamic Random Access Memory (SDRAM), double Data Rate Synchronous Dynamic Random Access Memory (DDRSDRAM), enhanced Synchronous Dynamic Random Access Memory (ESDRAM), enhanced Synchronous Dynamic Random Access Memory (Enhanced DRAM), synchronous Dynamic Random Access Memory (SLDRAM), direct Memory (DRmb Access), and Random Access Memory (DRAM). The memory 42 described in connection with the embodiments of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.
The method disclosed in the above embodiments of the present invention may be applied to the processor 41, or implemented by the processor 41. Processor 41 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by instructions in the form of hardware integrated logic circuits or software in the processor 41. The processor 41 described above may be a general purpose processor, DSP, or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or the like. Processor 41 may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the method disclosed by the embodiment of the invention can be directly implemented by a hardware decoding processor, or can be implemented by combining hardware and software modules in the decoding processor. The software modules may be located in a storage medium located in memory 42, where processor 41 reads the information in memory 42 and in combination with its hardware performs the steps of the method described above.
In an exemplary embodiment, the access network Device may be implemented by one or more Application Specific Integrated Circuits (ASICs), DSPs, programmable Logic Devices (PLDs), complex Programmable Logic Devices (CPLDs), FPGAs, general purpose processors, controllers, MCUs, microprocessors (microprocessors), or other electronic components for performing the aforementioned methods.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the time synchronization method according to the embodiments of the present invention.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of the unit is only a logical functional division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit may be implemented in the form of hardware, or in the form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps of implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer-readable storage medium, and when executed, executes the steps including the method embodiments; and the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media capable of storing program code.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention may be essentially implemented or a part contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods described in the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media capable of storing program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of time synchronization, the method comprising:
the access network equipment establishes a mapping relation between first address information of the access network equipment and second address information of a Network Time Protocol (NTP) server to generate a mapping relation set;
the access network equipment receives message data of a terminal;
if the message data is used for requesting time synchronization, analyzing the message data to obtain destination address information in the message data;
inquiring whether the mapping relation set contains the destination address information or not;
and when the mapping relation set contains the destination address information, acquiring time synchronization information and sending the time synchronization information to the terminal.
2. The method of claim 1, further comprising:
and when the mapping relation set does not contain the destination address information, sending the message data to other NTP servers based on the destination address information to obtain time synchronization information fed back by the other NTP servers.
3. The method of claim 2, further comprising:
and adding the mapping relation between the first address information of the access network equipment and the address information of the other NTP servers to the mapping relation set.
4. The access network equipment is characterized by comprising a mapping unit, a communication unit and a message processing unit; wherein,
the mapping unit is configured to establish a mapping relationship between first address information of the access network device and second address information of the NTP server, and generate a mapping relationship set;
the communication unit is used for receiving message data of the terminal;
the message processing unit is used for analyzing the message data to obtain destination address information in the message data if the message data is used for requesting time synchronization; inquiring whether the mapping relation set generated by the mapping unit contains the destination address information or not; when the mapping relation set comprises the destination address information, time synchronization information is obtained;
the communication unit is further configured to send the time synchronization information to the terminal.
5. The access network device according to claim 4, wherein the communication unit is further configured to, when the packet processing unit determines that the destination address information is not included in the mapping relationship set, send the packet data to another NTP server based on the destination address information, and obtain time synchronization information fed back by the other NTP server.
6. The access network device according to claim 5, wherein said mapping unit is further configured to add a mapping relationship between the first address information of the access network device itself and the address information of the other NTP server to the mapping relationship set.
7. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 3.
8. An access network device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 3 are implemented when the processor executes the program.
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| CN105281885A (en) * | 2014-07-25 | 2016-01-27 | 中兴通讯股份有限公司 | Time synchronization method and device used for network equipment and time synchronization server |
| EP3016316A1 (en) * | 2013-07-30 | 2016-05-04 | Huawei Technologies Co., Ltd. | Network control method and apparatus |
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| KR102400730B1 (en) * | 2016-02-23 | 2022-05-20 | 현대자동차주식회사 | Method for time synchronization between communication nodes in network |
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| EP3016316A1 (en) * | 2013-07-30 | 2016-05-04 | Huawei Technologies Co., Ltd. | Network control method and apparatus |
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