CN111867045B - Method, device and system for clock synchronization between cells - Google Patents
Method, device and system for clock synchronization between cells Download PDFInfo
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- CN111867045B CN111867045B CN202010566189.6A CN202010566189A CN111867045B CN 111867045 B CN111867045 B CN 111867045B CN 202010566189 A CN202010566189 A CN 202010566189A CN 111867045 B CN111867045 B CN 111867045B
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Abstract
The embodiment of the invention discloses a method, a device and a system for clock synchronization among cells. The method comprises the following steps: firstly, a satellite positioning system receiving module is installed on a Remote Radio Unit (RRU) provided with a fronthaul network transmission interface (eCPRI), and the remote radio unit synchronizes high-precision reference time received from the satellite positioning system receiving module to a baseband unit through the fronthaul network transmission interface according to a Precision Time Protocol (PTP); then, the base band unit synchronizes the reference time to other remote radio frequency units without the global positioning information receiving module according to the precise time protocol. Therefore, clock synchronization of each remote radio unit among cells is realized. According to the method, the satellite positioning system receiving module is installed on the far-end radio frequency unit, the satellite positioning system receiving module can be flexibly deployed outdoors or close to the window edge, the antenna is easy and feasible to place, and the deployment complexity can be greatly reduced.
Description
Technical Field
The present invention relates to the field of mobile communications technologies, and in particular, to a method, an apparatus, and a system for synchronizing clocks between cells.
Background
In cellular radio, a certain geographical area covered by a certain frequency band is called a cell (simply referred to as a cell). Different frequency bands are often adopted between adjacent cells, and when a user terminal is switched from one cell to another cell in a connection state, the whole cellular wireless network must be ensured to keep accurate synchronization between the cells, so that the service of the user terminal cannot be interrupted.
The mobile communication technology has two duplex communication modes: Time-Division Duplex (TDD) and Frequency-Division Duplex (FDD) modes. The TDD system transmits and receives signals in the same frequency band, and if frequency and phase synchronization is not achieved between cells, relatively serious mutual interference between transmission and reception occurs. To achieve frequency and phase synchronization of a network, frequency and clock synchronization of an access whole network generally needs to be ensured through a satellite signal of a satellite positioning system and a Precision Time Protocol (PTP) Protocol.
The technical scheme commonly used at present is as follows: 1) the satellite positioning system module is deployed in a baseband Unit (BBU), the scheme is complex in deployment and high in requirement on the Unit of the BBU, and particularly has high requirement on the environment and is more complex to deploy for a general server in an Open Radio Access Network (O-RAN) framework; 2) the satellite positioning system module is deployed on a clock server on a Core Network (CN), time information of a baseband unit is transmitted to an FPGA accelerator card through a software method on the baseband unit in the scheme, time precision is influenced, if the precision problem is solved, a 1588 clock server and a switch supporting 1588 are required to be introduced, and extra expenses are increased.
Therefore, how to simplify the deployment of the satellite positioning system and save the cost of the server to the greatest extent on the premise of not influencing the time precision of clock synchronization is still a problem to be solved.
Disclosure of Invention
In view of the above problems, the present inventors have creatively conceived to install a satellite positioning system receiving module on a remote radio unit with an Enhanced-CPRI (Enhanced-CPRI, eCPRI) in a cell managed by a baseband unit to receive a high-precision reference time in a satellite signal, and synchronize the satellite positioning system receiving module to other remote radio units through the baseband unit. Due to the flexible deployment position of the remote radio frequency unit, the remote radio frequency unit can be flexibly deployed outdoors or close to the window edge, the placement of the antenna is much easier, and the deployment complexity can be greatly reduced. In addition, the satellite positioning system receiving module is installed instead of the programmable hardware accelerator card, so that the area and the power consumption of the programmable hardware accelerator card can be greatly reduced.
Based on the above invention thought, the embodiment of the invention provides a method, a device and a system for inter-cell clock.
According to a first aspect of embodiments of the present invention, a method for inter-cell clock synchronization includes performing, at a first remote radio unit having a fronthaul network transmission interface and a satellite positioning system receiving module, the following operations: receiving reference time sent by a satellite positioning system by using a satellite positioning system receiving module; and sending the reference time to the baseband unit through the fronthaul network transmission interface according to the precise time protocol so as to synchronize the reference time to other second remote radio frequency units to be synchronized through the baseband unit, wherein the second remote radio frequency units comprise a remote radio frequency unit with a Common Public Radio Interface (CPRI) and/or a second remote radio frequency unit with the fronthaul network transmission interface.
According to an embodiment of the present invention, before performing the following operations on a first remote radio unit provided with a fronthaul network transmission interface and a satellite positioning system receiving module, the method further includes: determining a far-end radio frequency unit as a first far-end radio frequency unit from the far-end radio frequency units provided with the transmission interfaces of the fronthaul network; and a satellite positioning system receiving module is arranged and arranged on the first remote radio frequency unit.
According to an embodiment of the present invention, a programmable hardware accelerator card is disposed on the baseband unit, and accordingly, the sending of the reference time to the baseband unit through the fronthaul network transmission interface includes: and sending the reference time to a programmable hardware accelerator card arranged on the baseband unit through a fronthaul network transmission interface.
According to a second aspect of the embodiments of the present invention, a method for clock synchronization between cells is applied to a baseband unit, and the method includes: receiving reference time sent by a first remote radio frequency unit; and transmitting the reference time to the second remote radio frequency unit according to the precise time protocol so as to realize the clock synchronization between the first remote radio frequency unit and the second remote radio frequency unit.
According to an embodiment of the present invention, before receiving the reference time transmitted by the first remote rf unit, the method further includes: setting a baseband unit as a boundary clock according to a precise time protocol; establishing a master-slave relationship with the first remote radio frequency unit according to a precise time protocol, wherein the master-slave relationship sets the first remote radio frequency unit as a master clock and sets the baseband unit as a slave clock; and establishing a master-slave relationship with the second remote radio frequency unit according to the precise time protocol, wherein the master-slave relationship sets the baseband unit as a master clock and sets the second remote radio frequency unit as a slave clock.
According to an embodiment of the present invention, a programmable hardware accelerator card is disposed on the baseband unit, and accordingly, the method is executed on the programmable hardware accelerator card.
According to an embodiment of the present invention, the programmable hardware accelerator card is provided with an optical port, and the method further includes: and according to the interface type of the connected remote radio frequency unit, dynamically configuring the optical port into a type matched with the interface type of the remote radio frequency unit.
According to a third aspect of the embodiments of the present invention, an apparatus for clock synchronization between cells, the apparatus being applied to a first remote radio unit, the apparatus includes: the satellite positioning system receiving module is used for receiving the reference time sent by the satellite positioning system; and the first time information sending module is used for sending the reference time to the baseband unit through the fronthaul network transmission interface according to the precise time protocol so as to synchronize the reference time to other second remote radio frequency units to be synchronized through the baseband unit, and the second remote radio frequency units comprise remote radio frequency units with a common public radio interface and/or second remote radio frequency units with the fronthaul network transmission interface.
According to a fourth aspect of the embodiments of the present invention, an apparatus for synchronizing clocks between cells, the apparatus being applied to a baseband unit, the apparatus includes: the reference time acquisition module is used for receiving reference time sent by the first remote radio frequency unit; and the second time information sending module is used for sending the reference time to the second remote radio frequency unit according to the precise time protocol so as to realize the clock synchronization of the first remote radio frequency unit and the second remote radio frequency unit.
According to a fifth aspect of the embodiments of the present invention, there is provided an inter-cell clock synchronization system, including a first remote radio frequency unit, a second remote radio frequency unit, and a baseband unit, where the first remote radio frequency unit is provided with a fronthaul network transmission interface and a satellite positioning system receiving module, and is configured to receive a reference time sent by a satellite positioning system using the satellite positioning system receiving module; sending the reference time to a baseband unit through a fronthaul network transmission interface according to a precise time protocol so as to synchronize the reference time to other second remote radio frequency units to be synchronized through the baseband unit, wherein the second remote radio frequency units comprise a remote radio frequency unit with a common public radio interface and/or a second remote radio frequency unit with the fronthaul network transmission interface; the base band unit is used for receiving the reference time sent by the first remote radio frequency unit and sending the reference time to the second remote radio frequency unit according to the precise time protocol; and the second remote radio frequency unit is not provided with a satellite positioning system receiving module and is used for receiving the reference time sent by the baseband unit and adjusting the local clock so as to realize clock synchronization with the first remote radio frequency unit.
The embodiment of the invention discloses a method, a device and a system for clock synchronization among cells. The method comprises the following steps: firstly, a satellite positioning system receiving module is installed on a far-end radio frequency unit provided with a fronthaul network transmission interface, and the far-end radio frequency unit synchronizes high-precision reference time received from the satellite positioning system receiving module to a baseband unit through the fronthaul network transmission interface according to a precise time protocol; then, the base band unit synchronizes the reference time to other remote radio frequency units without the global positioning information receiving module according to the precise time protocol. Therefore, clock synchronization of each remote radio frequency unit among cells is realized. According to the method, the satellite positioning system receiving module is arranged on the far-end radio frequency unit, the satellite positioning system receiving module can be flexibly arranged outdoors or close to the window edge, the antenna is easy and feasible to arrange, and the arrangement complexity can be greatly reduced. In addition, the satellite positioning system receiving module is arranged on the far-end radio frequency unit, and the work load of the baseband unit can be greatly reduced.
It is to be understood that the teachings of the embodiments of the present invention need not achieve all of the above-described advantages, but rather that certain features may achieve certain technical effects, and that other implementations of the embodiments of the present invention may achieve other advantages not mentioned above.
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The above and other objects, features and advantages of exemplary embodiments of the present invention will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present invention are illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which:
in the drawings, like or corresponding reference characters designate like or corresponding parts.
FIG. 1 is a schematic diagram of an application scenario of clock synchronization between cells according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating an implementation of the inter-cell clock synchronization method at the first remote radio unit according to the embodiment of the present invention;
fig. 3 is a schematic flowchart of an implementation process of the inter-cell clock synchronization method at the baseband unit end according to the embodiment of the present invention;
fig. 4 is a schematic structural diagram of an inter-cell clock synchronization apparatus at a first remote radio unit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a baseband unit side of an inter-cell clock synchronization apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Fig. 1 shows an application scenario of the inter-cell clock synchronization method according to an embodiment of the present invention. Referring to fig. 1, which is a schematic diagram of a 5G system, when a user terminal 001 moves from a cell covered by one remote radio unit to a cell covered by another remote radio unit in a connected state, during the moving process, a handover of the cells needs to be performed, which requires that high-precision time synchronization and frequency synchronization be maintained between the remote radio units, such as between the eccri remote radio unit 002, or between the CPRI remote radio unit 003, or even between the eccri remote radio unit 002 and the CPRI remote radio unit 003, so as to maintain the connection without interruption. In order to implement such time synchronization and frequency synchronization between remote rf units, in the embodiment of the present invention, an eccri remote rf unit 002 is selected from a cell managed by the baseband unit 005, and a satellite positioning system receiving module 0021 is installed on the eccri remote rf unit 002 to receive high-precision reference time carried in a satellite signal transmitted by a satellite 004. After receiving the high-precision reference time through the satellite positioning system receiving module 0021, the eCPRI remote rf unit 002 synchronizes the reference time to the programmable hardware accelerator card 0051 of the baseband unit 005 according to the precision time protocol. Then, the programmable hardware accelerator card 0051 synchronizes the reference time to the remote rf units of other cells governed by the baseband unit 005 according to the precise time protocol, where the reference time includes the eccri remote rf unit 002 and/or the CPRI remote rf unit 003, thereby implementing clock synchronization between the cells.
A transmission path of a precision time protocol message is partially indicated in dotted lines in fig. 1. In order to ensure that the precise time protocol packet can smoothly and quickly transmit the communication between the programmable hardware accelerator card 0051 and the remote rf units of each cell managed by the baseband unit 005 through the optical interface. In addition, the programmable hardware accelerator card 0051 is provided on the base station unit 005, and is connected to the baseband unit 0005 by a PCIE bus. In addition, the baseband unit 005, the switch 006 and the core network 007 are responsible for synchronization and forwarding of communication data.
It should be noted that the application scenario shown in fig. 1 is only one of the application scenarios in the embodiment of the present invention, is an exemplary illustration, and is not a limitation to the application scenario in the embodiment of the present invention, and the embodiment of the present invention may be applied to any applicable scenario.
According to a first aspect of the embodiments of the present invention, a method for synchronizing clocks between cells includes, at a first remote rf unit having a fronthaul network transmission interface and a satellite positioning system receiving module, performing the following operations as shown in fig. 2: an operation 210 of receiving, using a satellite positioning system receiving module, a reference time transmitted by a satellite positioning system; in operation 220, the reference time is sent to the baseband unit through the fronthaul network transmission interface according to the precision time protocol so as to synchronize the reference time to other second remote radio frequency units to be synchronized through the baseband unit, where the second remote radio frequency units include a remote radio frequency unit with a common public radio interface and/or a second remote radio frequency unit with the fronthaul network transmission interface.
In operation 210, the satellite positioning system receiving module is primarily used to receive a high precision reference time carried in satellite signals of the satellite positioning system. Among the commonly used satellite positioning systems, there are Global Positioning System (GPS), Global Navigation Satellite System (GNSS), GLONASS (GLONASS), beidou or galileo, etc.
In operation 220, the precision time protocol is a high precision time synchronization protocol that can achieve sub-microsecond precision and can achieve a bias precision of about 30 nanoseconds with the data. The use of this protocol ensures the accuracy of time synchronization. The transmission interface of the forwarding network can greatly reduce the requirement of the forwarding rate and greatly compress the forwarding bandwidth, thereby greatly improving the transmission and exchange rate of the precise time protocol message and being beneficial to realizing the real-time synchronization of each remote radio frequency unit.
In the framework of a distributed base station, traditional macro base station equipment is divided into two functional modules, namely a base station unit and a remote radio frequency unit according to functions, wherein the functions of a base band, a master control unit, a transmission unit, a clock and the like of the base station are integrated on one base band unit; and the radio frequency in the transceiver, power amplifier, etc. is integrated on the remote radio frequency unit. Generally, one baseband unit corresponds to a plurality of remote radio frequency units, and in the plurality of remote radio frequency units corresponding to each baseband unit, as long as one radio frequency unit is provided with a satellite positioning system receiving module, the baseband unit can synchronize high-precision reference time transmitted by the remote radio frequency unit to other remote radio frequency units which are not provided with the satellite positioning system receiving module, so that clock synchronization of each remote radio frequency unit can be realized. The other second remote rf units not equipped with the receiving module of the satellite positioning system are not necessarily the second remote rf units with the transmission interface of the forward transmission network, and may also be the remote rf units with the common public radio interface.
As mentioned above, in the prior art, the satellite positioning system is usually installed on the baseband unit or the clock server, but in the embodiment of the present invention, the satellite positioning system receiving module is skillfully installed on the remote rf unit. Therefore, the antenna can be flexibly deployed outdoors or at a position close to the window edge, and the antenna can be more easily placed. And the first remote radio frequency unit provided with the forward network transmission interface and the satellite positioning system receiving module is used for receiving the reference time sent by the satellite positioning system, so that the deployment complexity can be greatly reduced, and the exchange and transmission rate of the reference time can be further shortened.
According to an embodiment of the present invention, before performing the following operations on a first remote rf unit provided with a fronthaul network transmission interface and a satellite positioning system receiving module, the method further includes: determining a far-end radio frequency unit as a first far-end radio frequency unit from the far-end radio frequency units provided with the transmission interfaces of the fronthaul network; and installing and arranging a satellite positioning system receiving module on the first remote radio frequency unit.
Before the inter-cell clock synchronization method is executed, it is first required to determine a remote radio unit from remote radio units provided with a fronthaul network transmission interface as a first remote radio unit, and install and set a satellite positioning system receiving module on the first remote radio unit. Typically, the baseband units are centrally located in an indoor room, and the remote rf units are mounted to each floor and connected to an antenna. Therefore, the deployed position of the remote rf unit is very suitable for installing and setting the receiving module of the satellite positioning system requiring the antenna. When the first remote rf unit is selected, a remote rf unit provided with a fronthaul network transmission interface and located outdoors or near a window may be selected. Thus, satellite signals transmitted by the satellite positioning system can be more easily received and can be more stably and continuously synchronized within a period of time.
According to an embodiment of the present invention, a programmable hardware accelerator card is disposed on the baseband unit, and accordingly, the sending of the reference time to the baseband unit through the fronthaul network transmission interface includes: and sending the reference time to a programmable hardware accelerator card arranged on the baseband unit through a fronthaul network transmission interface.
There are also some limitations in speed and accuracy if software installed on the baseband unit is directly used to process accurate time information. In this embodiment, the baseband unit receives the high-precision reference time transmitted by the first remote rf unit through a programmable hardware accelerator card connected to the baseband unit. Therefore, in this embodiment, the fronthaul network transmission interface of the first remote rf unit is configured to be connected to the network port of the programmable hardware accelerator card, and send the high-precision reference time to the programmable hardware accelerator card.
According to a second aspect of the embodiments of the present invention, a method for clock synchronization between cells is applied to a baseband unit, as shown in fig. 3, and the method includes: operation 310, receiving a reference time sent by a first remote radio unit; in operation 320, a reference time is transmitted to the second remote rf unit according to the precision time protocol to achieve clock synchronization between the first remote rf unit and the second remote rf unit.
In operation 310, the reference time received by the baseband unit is sent by the first remote rf unit through the fronthaul network transmission interface, and has the characteristics of high accuracy and low requirement on the rate. The satellite positioning system receiving module is arranged on the first far-end radio frequency unit instead of the base station unit, so that the deployment difficulty is simplified, and the workload of the baseband unit can be reduced.
According to an embodiment of the present invention, before receiving the reference time transmitted by the first remote rf unit, the method further includes: setting a baseband unit as a boundary clock according to a precise time protocol; establishing a master-slave relationship with the first remote radio frequency unit according to a precise time protocol, wherein the master-slave relationship sets the first remote radio frequency unit as a master clock and sets the baseband unit as a slave clock; and establishing a master-slave relationship with the second remote radio frequency unit according to the precise time protocol, wherein the master-slave relationship sets the baseband unit as a master clock and sets the second remote radio frequency unit as a slave clock.
In this embodiment, the baseband unit may serve as a boundary clock, first serve as a slave clock, perform clock synchronization with the first remote rf unit, correct the local clock, and then serve as a master clock to synchronize the corrected local clock to the second remote rf unit, thereby implementing clock synchronization between the second remote rf unit and the first remote rf unit. In order to implement the above function of the boundary clock, in this embodiment, the baseband unit device is required to be provided with a plurality of 1588 ports, where one 1588 port is set as a slave clock interface of a precise time protocol to be connected to the first far-end radio frequency unit and receive the high-precision reference time sent by the first far-end radio frequency unit, and the other 1588 ports are set as a master clock interface of the precise time protocol to be connected to the second far-end radio frequency unit and synchronize the rectified local clock to the second far-end radio frequency unit, so that the gradual transmission and synchronization of the clocks can be implemented.
According to an embodiment of the present invention, the baseband unit is provided with a programmable hardware accelerator card, and accordingly, the method is executed on the programmable hardware accelerator card.
As previously mentioned, there are also some limitations in speed and accuracy if software installed on the baseband unit is directly used to process accurate time information. In this embodiment, the baseband unit executes the inter-cell clock synchronization method through a programmable hardware accelerator card connected to the baseband unit. The programmable hardware accelerator card is a programmable processing chip or other electronic circuit device, such as a Field Programmable Gate Array (FPGA) card. The precision of processing the precision time protocol messages and the time stamps by using the hardware logic of the programmable hardware accelerator card is much higher than that of processing the precision time protocol messages and the time stamps by using software.
According to an embodiment of the present invention, the programmable hardware accelerator card is provided with an optical port, and the method further includes: and according to the interface type of the connected remote radio frequency unit, dynamically configuring the optical port into a type matched with the interface type of the remote radio frequency unit.
As mentioned above, the second remote rf unit to be synchronized includes a remote rf unit with a common public radio interface and/or a second remote rf unit with a fronthaul network transmission interface, and some programmable hardware accelerator cards, for example, the programming logic of a fpga card, can dynamically configure the common public radio interface and the fronthaul network transmission interface while supporting multiple optical ports. Each optical port can be configured to be an interface corresponding to the type of the connected remote radio unit according to the type of the connected remote radio unit.
According to a third aspect of the embodiments of the present invention, an apparatus for synchronizing clocks between cells, the apparatus being applied to a first remote rf unit, as shown in fig. 4, the apparatus 40 includes: a satellite positioning system receiving module 401, configured to receive a reference time sent by a satellite positioning system; a first time information sending module 402, configured to send the reference time to the baseband unit BBU through the fronthaul network transmission interface according to the precise time protocol so as to synchronize the reference time to other second remote radio frequency units to be synchronized through the baseband unit, where the second remote radio frequency units include a remote radio frequency unit with a common public radio interface and/or a second remote radio frequency unit with the fronthaul network transmission interface.
According to an embodiment of the present invention, the apparatus 40 further includes a satellite positioning system receiving module installing and setting module, configured to install and set the satellite positioning system receiving module on the first remote rf unit.
According to an embodiment of the present invention, the baseband unit is provided with a programmable hardware accelerator card, and accordingly, the first time information sending module 402 is specifically configured to send the reference time to the programmable hardware accelerator card provided on the baseband unit through the fronthaul network transmission interface.
According to a fourth aspect of the embodiments of the present invention, an apparatus for synchronizing clocks between cells, the apparatus being applied to a baseband unit, as shown in fig. 5, the apparatus 50 includes: a reference time obtaining module 501, configured to receive a reference time sent by a first remote radio unit; a second time information sending module 502, configured to send the reference time to the second remote rf unit according to the precise time protocol, so as to implement clock synchronization between the first remote rf unit and the second remote rf unit.
According to an embodiment of the present invention, the apparatus 50 further includes a precise time protocol setting module, configured to set the baseband unit as a boundary clock according to a precise time protocol; establishing a master-slave relationship with the first remote radio frequency unit according to a precise time protocol, wherein the master-slave relationship sets the first remote radio frequency unit as a master clock and sets the baseband unit as a slave clock; and establishing a master-slave relationship with the second remote radio frequency unit according to the precise time protocol, wherein the master-slave relationship sets the baseband unit as a master clock and sets the second remote radio frequency unit as a slave clock.
According to an embodiment of the present invention, the baseband unit is provided with a programmable hardware accelerator card, and accordingly, the apparatus 50 is specifically applied to the programmable hardware accelerator card provided on the baseband unit.
According to an embodiment of the present invention, an optical port is disposed on the programmable hardware accelerator card, and accordingly, the apparatus 50 further includes an optical port configuration module, configured to dynamically configure the optical port to a type matching an interface type of the remote radio frequency unit according to the interface type of the connected remote radio frequency unit.
According to a fifth aspect of the embodiments of the present invention, there is provided an inter-cell clock synchronization system, including a first remote radio frequency unit, a second remote radio frequency unit, and a baseband unit, where the first remote radio frequency unit is provided with a fronthaul network transmission interface and a satellite positioning system receiving module, and is configured to receive a reference time sent by a satellite positioning system using the satellite positioning system receiving module; sending the reference time to a baseband unit through a fronthaul network transmission interface according to a precise time protocol so as to synchronize the reference time to other second remote radio frequency units to be synchronized through the baseband unit, wherein the second remote radio frequency units comprise a remote radio frequency unit with a common public radio interface and/or a second remote radio frequency unit with the fronthaul network transmission interface; the base band unit is used for receiving the reference time sent by the first remote radio frequency unit and sending the reference time to the second remote radio frequency unit according to the precise time protocol; and the second remote radio frequency unit is not provided with a satellite positioning system receiving module and is used for receiving the reference time sent by the baseband unit and adjusting the local clock so as to realize clock synchronization with the first remote radio frequency unit.
Here, it should be noted that: the above description of the embodiment of the apparatus for inter-cell clock synchronization and the above description of the embodiment of the system for inter-cell clock synchronization are similar to the description of the foregoing method embodiments, and have similar beneficial effects to the foregoing method embodiments, and therefore, no further description is given. For the technical details that are not disclosed yet in the description of the embodiment of the apparatus for inter-cell clock synchronization and the description of the embodiment of the system for inter-cell clock synchronization of the present invention, please refer to the description of the foregoing method embodiment of the present invention for brevity, and therefore will not be described again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element identified by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
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 one logical function 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 device, 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; can be located in one place or 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 functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executing s; and the aforementioned storage medium includes: various media capable of storing program codes, such as a removable storage medium, a Read Only Memory (ROM), a magnetic disk, and an optical disk.
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 or portions thereof 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 to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage medium, a ROM, a magnetic disk, an optical disk, or the like.
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 conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within 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 (5)
1. A method for clock synchronization between cells, the method is applied to a baseband unit of an open radio access network, a programmable hardware accelerator card is arranged on the baseband unit, and the method is executed on the programmable hardware accelerator card, and the method comprises the following steps:
receiving reference time sent by a first remote radio frequency unit through a fronthaul network transmission interface;
and transmitting the reference time to a second remote radio frequency unit according to a precise time protocol so as to realize clock synchronization between the first remote radio frequency unit and the second remote radio frequency unit.
2. The method of claim 1, prior to said receiving said reference time transmitted by the first remote radio unit, further comprising:
setting a programmable hardware acceleration card arranged on the baseband unit as a boundary clock according to a precise time protocol;
establishing a master-slave relationship with the first remote radio frequency unit according to a precise time protocol, wherein the master-slave relationship sets the first remote radio frequency unit as a master clock and sets a programmable hardware acceleration card arranged on the baseband unit as a slave clock;
and establishing a master-slave relationship with the second remote radio frequency unit according to a precise time protocol, wherein the master-slave relationship sets a programmable hardware acceleration card arranged on the baseband unit as a master clock and sets the second remote radio frequency unit as a slave clock.
3. The method of claim 1, the programmable hardware accelerator card having an optical port disposed thereon, the method further comprising:
and dynamically configuring the optical port into a type matched with the interface type of the remote radio frequency unit according to the interface type of the connected remote radio frequency unit.
4. An apparatus for clock synchronization between cells, the apparatus being applied to a baseband unit of an open radio access network, the baseband unit being provided with a programmable hardware accelerator card, the apparatus being provided on the programmable hardware accelerator card, the apparatus comprising:
the reference time acquisition module is used for receiving reference time sent by the first remote radio frequency unit through the fronthaul network transmission interface;
and the second time information sending module is used for sending the reference time to a second remote radio frequency unit according to a precise time protocol so as to realize clock synchronization of the first remote radio frequency unit and the second remote radio frequency unit.
5. A system for clock synchronization between cells comprises a first remote radio frequency unit, a second remote radio frequency unit and a baseband unit of an open radio access network, wherein the baseband unit is provided with a programmable hardware accelerator card,
the first remote radio frequency unit is provided with a fronthaul network transmission interface and a satellite positioning system receiving module and is used for receiving the reference time sent by the satellite positioning system by using the satellite positioning system receiving module; sending the reference time to a programmable hardware accelerator card arranged on a baseband unit through the fronthaul network transmission interface according to a precise time protocol so as to synchronize the reference time to other second remote radio frequency units to be synchronized through the programmable hardware accelerator card arranged on the baseband unit, wherein the second remote radio frequency units comprise remote radio frequency units with a common public radio interface and/or second remote radio frequency units with the fronthaul network transmission interface;
the programmable hardware accelerator card is arranged on the baseband unit and used for receiving the reference time sent by the first remote radio frequency unit and sending the reference time to the second remote radio frequency unit according to a precise time protocol;
and the second remote radio frequency unit is not provided with a satellite positioning system receiving module and is used for receiving the reference time sent by the programmable hardware accelerator card arranged on the baseband unit and adjusting a local clock so as to realize clock synchronization with the first remote radio frequency unit.
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| CN115278703B (en) * | 2022-07-28 | 2023-06-30 | 西安电子科技大学 | Concealed reconfigurable satellite measurement, operation and control network device and deployment method |
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