CN114745680A - Wireless base station time synchronization method, device, equipment and storage medium - Google Patents
Wireless base station time synchronization method, device, equipment and storage medium Download PDFInfo
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- CN114745680A CN114745680A CN202210650763.5A CN202210650763A CN114745680A CN 114745680 A CN114745680 A CN 114745680A CN 202210650763 A CN202210650763 A CN 202210650763A CN 114745680 A CN114745680 A CN 114745680A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/25—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS
- G01S19/256—Acquisition or tracking or demodulation of signals transmitted by the system involving aiding data received from a cooperating element, e.g. assisted GPS relating to timing, e.g. time of week, code phase, timing offset
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the application discloses a method, a device, equipment and a storage medium for time synchronization of a wireless base station, wherein the method comprises the following steps: detecting a GNSS signal; if the GNSS signal is not detected, acquiring synchronous state information of at least one second base station; determining from the synchronization status information whether there is the second base station in the cellular network that detects the GNSS signal; if the second base station detecting the GNSS signal exists, determining a synchronous target base station according to a preset screening rule; and carrying out time synchronization based on the synchronous broadcast block sent by the synchronous target base station according to the propagation delay with the synchronous target base station. The scheme solves the problem that part or all wireless base stations cannot obtain uniform time service signals to realize the synchronization of the transmitted signals, can effectively keep the synchronization of all the wireless base stations, avoids signal dislocation and reduces the influence on the system performance.
Description
Technical Field
The embodiment of the application relates to the technical field of communication, in particular to a method, a device, equipment and a storage medium for time synchronization of a wireless base station.
Background
In a wireless communication system, a base station is used as a basic unit of a wireless access network, the base station and a mobile terminal exchange information through wireless signals to realize the access function of the mobile terminal, and a plurality of wireless cells controlled by the base station respectively cover a local area in a certain range, thereby forming a cellular network. In the network, the time unit of the downlink transmission synchronization broadcast block between each base station should be consistent to avoid interference caused by misalignment between the transmitted signals.
Generally, the principle of maintaining timing synchronization between base stations is that the base stations obtain unified time service information, and derive a unified time boundary of a transmission unit of a wireless signal according to current time, and the sources of the time service information generally include two types: a Satellite time signal of Global Navigation Satellite System (GNSS); one is IEEE (Institute of Electrical and Electronics Engineers) 1588 "Fine clock synchronization protocol Standard for network measurement and control systems" transmitted over Ethernet.
But due to the limitation of deployment scenarios and cost control, the base station may not obtain an effective time service signal source. For example, in an indoor or underground scene, the base station may have weak received GNSS signals due to shadowing, or the IEEE 1588 module may not be deployed due to a condition limitation. Due to the above condition limitation, part or all of the base stations cannot obtain a uniform time service signal, and synchronization of the transmission signals cannot be realized, thereby increasing signal interference and affecting system performance.
Disclosure of Invention
The embodiment of the application provides a method, a device, equipment and a storage medium for time synchronization of wireless base stations, solves the problem that part or all of the wireless base stations cannot obtain uniform time signals to achieve synchronization of transmitted signals, can effectively keep synchronization of the wireless base stations, avoids signal dislocation and reduces influence on system performance.
In a first aspect, an embodiment of the present application provides a method for time synchronization of a wireless base station, where the method includes:
detecting a GNSS signal;
if the GNSS signal is not detected, acquiring synchronous state information of at least one second base station;
determining from the synchronization status information whether there is the second base station in the cellular network that detects the GNSS signal;
if the second base station detecting the GNSS signal exists, determining a synchronous target base station according to a preset screening rule;
and carrying out time synchronization based on the synchronous broadcast block sent by the synchronous target base station according to the propagation delay with the synchronous target base station.
In a second aspect, an embodiment of the present application provides a wireless base station time synchronization apparatus, including:
a signal detection module configured to detect a GNSS signal;
an information obtaining module configured to obtain synchronization status information of at least one of the second base stations if the GNSS signal is not detected;
a base station detection module configured to determine whether there is the second base station in the cellular network that detected the GNSS signal according to the synchronization status information;
a base station determination module configured to determine a synchronization target base station according to a preset screening rule if the second base station detecting the GNSS signal exists;
and the time synchronization module is configured to perform time synchronization based on the synchronous broadcast block sent by the synchronous target base station according to the propagation delay with the synchronous target base station.
In a third aspect, an embodiment of the present application provides a wireless base station time synchronization apparatus, including:
one or more processors;
storage means for storing one or more programs;
when one or more of the programs are executed by one or more of the processors, the one or more of the processors implement the time synchronization method of the radio base station according to the embodiment of the present application.
In a fourth aspect, the present application further provides a storage medium storing computer-executable instructions, which when executed by a computer processor, are configured to perform the wireless base station time synchronization method according to the present application.
In the embodiment of the application, each wireless base station can broadcast the synchronization state information and the synchronization broadcast block resource to the adjacent wireless base stations, that is, each wireless base station can be used as a synchronization reference source of the adjacent wireless base station, and the wireless base stations in the cellular network keep synchronization with the adjacent wireless base stations through continuous synchronization, so that the wireless base stations in the whole network keep synchronization, the dislocation between signals is avoided, and the influence of interference on the system performance is reduced.
Drawings
Fig. 1 is a schematic diagram of a topology of a wireless base station in a cellular network according to an embodiment of the present application;
fig. 2 is a flowchart of a method for time synchronization of a wireless base station according to an embodiment of the present application;
fig. 3 is a schematic diagram of a wireless base station determining propagation delay according to an embodiment of the present application;
fig. 4 is a schematic diagram of a wireless base station determining propagation delay according to another embodiment of the present application;
fig. 5 is a schematic diagram of a radio base station for determining propagation delay according to another embodiment of the present application;
fig. 6 is a schematic diagram illustrating a wireless base station updating a synchronization status of a base station according to an embodiment of the present application;
fig. 7 is a flowchart illustrating a method for updating a synchronization status of a base station by a wireless base station according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a time synchronization apparatus of a wireless base station according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a wireless base station time synchronization apparatus according to an embodiment of the present application.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the embodiments described herein are illustrative of the present application and are not limiting of the present application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures.
The terms "first", "second", and the like in the description and claims of the present application are used for distinguishing similar objects and are not used to describe a particular order or sequence, e.g., "first" and "second" of a first base station and a second base station are used to distinguish different wireless base stations and may be interchanged as appropriate, so that embodiments of the present application can be implemented in an order other than those illustrated or described below, and the objects distinguished by "first", "second", and the like are generally a class and do not limit the number of objects, e.g., the first object may be one or more. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The method for time synchronization of a wireless base station is applied to the wireless base station, the first base station and the second base station are both wireless base stations and serve as adjacent wireless base stations, both the first base station and the second base station can serve as a transceiver, signals and/or information can be transmitted between the first base station and the second base station, and the first base station and at least one second base station form a cellular network. Therefore, the present application explains the present application by taking the first base station as a receiving side and the second base station as a sending side as an example.
In a cellular network, signals and/or Information can be transmitted between two adjacent wireless base stations, and during the process of broadcasting a synchronized Broadcast Block by a wireless base station, a terminal device (such as a mobile phone, etc.) can receive the synchronized Broadcast Block, and the adjacent wireless base stations can also receive the synchronized Broadcast Block, it can be understood that a synchronized Signal and Physical Broadcast Channel Block (SSB) is referred to as a synchronized Broadcast Block for short, the synchronized Broadcast Block includes a Synchronized Signal (SS) and a Physical Broadcast Channel (PBCH), and the wireless base stations transmit SIB (System Information Block), SIB-based System messages, parameters, and the like through a PDSCH (Physical Downlink Shared Channel).
Fig. 1 is a schematic diagram of a topology structure of a wireless base station in a cellular network according to an embodiment of the present application, and as shown in the figure, data, such as SSBs and SIBs, is wirelessly transmitted between the base stations. With the wireless base station a as the first base station and the wireless base stations B and C as the second base stations, the wireless base station B can detect a GNSS signal and the wireless base station C does not detect a GNSS signal, and in the case where the wireless base station a cannot detect a GNSS signal, the wireless base station a can acquire signals from the wireless base stations B and C, such as acquiring synchronization state information, so that the wireless base station B serves as a synchronization target base station, it can be understood that the wireless base station a preferentially selects a wireless base station that can detect a GNSS signal, that is, a wireless base station whose base station synchronization state is a direct synchronization state, and for example, the wireless base station a can acquire synchronization state information through a signal transmitted by the wireless base station B, C, thereby preferentially selecting the wireless base station B that is a direct synchronization state as a synchronization target base station.
After the time synchronization of the adjacent wireless base station A and the wireless base station B is completed, the wireless base station A can also perform time synchronization with the adjacent wireless base station C, at the moment, the wireless base station A is used as a second base station, the wireless base station C is used as a first base station and realigns the synchronization time according to the detection result of the base station A, and after the time synchronization of the wireless base station A and the wireless base station C is completed, all the wireless base stations in the whole cellular network are kept in synchronization, so that the signal dislocation can be effectively avoided, and the influence on the system performance is reduced.
Fig. 2 is a flowchart illustrating steps of a method for time synchronization of a wireless base station according to an embodiment of the present application, and as shown in fig. 2, the method at least includes the following specific steps:
step S110, detecting GNSS signals.
The GNSS signal is a satellite timing signal for determining time synchronization of satellite timing using GNSS, and it can be understood that, in the wireless base station, the wireless base station constantly detects the GNSS signal, and after detecting the GNSS signal, the timing information associated with the signal is used as local synchronized time.
In an embodiment, after detecting the GNSS signal, the first base station acquires the time service information according to the GNSS signal, and performs time synchronization, so that synchronization can be effectively achieved, and the time service information can be used as a time standard in the cellular network, that is, can be used as an object for synchronization of other wireless base stations in the network, so that the wireless base stations of the entire network can unify time boundaries, and achieve time synchronization.
When the wireless base station is synchronized with another wireless base station, if the first base station is synchronized with the second base station, the first base station may acquire the time service information from the GNSS signal to perform time synchronization when the first base station detects the GNSS signal.
Step S120, if the GNSS signal is not detected, acquiring synchronization status information of at least one second base station.
It can be understood that, when a wireless base station is capable of sending synchronization state information to an adjacent wireless base station, the synchronization state information is used to indicate a base station synchronization state of the wireless base station to determine whether it is synchronized with a GNSS signal, for example, a first base station may obtain synchronization state information sent by a second base station, where the base station synchronization state includes a direct synchronization state, an indirect synchronization state, or a temporary synchronization state, the direct synchronization state indicates that a current wireless base station is time-synchronized with time service information associated with the GNSS signal, the indirect synchronization state indicates that the current wireless base station is synchronized with another wireless base station that has detected the GNSS signal, and the temporary synchronization state indicates that the current wireless base station is synchronized with another wireless base station that has not detected the GNSS signal or a wireless base station that is timed according to its own clock.
Illustratively, the radio base station a is a first base station, the radio base station B, C, D is a second base station, and the radio base station B performs time synchronization with the time service information related to the GNSS signal, that is, the base station synchronization state of the radio base station B is a direct synchronization state; the wireless base station C is synchronized with the wireless base station B, that is, the base station synchronization state of the wireless base station C is an indirect synchronization state; the wireless base station D does not detect the GNSS signal and performs timing according to its own clock, that is, the base station synchronization state of the wireless base station D is the temporary synchronization state.
When the wireless base station A detects a GNSS signal, the wireless base station A carries out time synchronization by using time service information associated with the GNSS signal, and the base station synchronization state of the wireless base station A is a direct synchronization state; when the wireless base station a is synchronized with the wireless base station B or the wireless base station C, the base station synchronization state of the wireless base station a is an indirect synchronization state; when the wireless base station A is synchronous with the wireless base station D, the base station synchronization state of the wireless base station A is a temporary synchronization state; when the radio base station a performs timing with its own clock, the base station synchronization state of the radio base station a is also a temporary synchronization state.
Therefore, when the first base station fails to detect the GNSS signal, the first base station acquires synchronization state information of the second base station, and the base station synchronization state of the second base station can be determined by analyzing the synchronization state information.
Step S130, determining whether there is a second base station in the cellular network that detects the GNSS signal according to the synchronization status information.
By analyzing the acquired synchronization state information, the first base station may determine a base station synchronization state of an adjacent second base station, so as to determine whether there is a second base station that detects a GNSS signal in the cellular network, and it may be understood that, in the plurality of second base stations, each second base station may have a different base station synchronization state, for example, there are a plurality of second base stations whose base station synchronization states are a direct synchronization state or an indirect synchronization state, and therefore, it is necessary to determine the base station synchronization state of the second base station according to the synchronization state information, so as to determine the second base station that performs time synchronization with the second base station, and the first base station preferentially selects the second base station to perform time synchronization.
In an embodiment, the first base station determines whether the base station synchronization state of the second base station is a direct synchronization state or an indirect synchronization state according to the synchronization state information, and when the base station synchronization state of the second base station is the direct synchronization state, that is, the second base station is synchronized with the time service information corresponding to the GNSS signal, and when the base station synchronization state of the second base station is the indirect synchronization state, it indicates that there is a second base station that completes time synchronization with another second base station that detects the GNSS signal, that is, the corresponding second base station that acquires the synchronization state information is indirectly synchronized with the time service information corresponding to the GNSS signal.
In an embodiment, SIB is transmitted between the first base station and the second base station through PDSCH, and a status cell is added in the first system message block SIB1, where the status cell is used to mark a base station synchronization status of the wireless base station, that is, the status cell is used as synchronization status information, for example, the status cell is represented by an enumeration type, syncStatus estimated { direct, index, temp }, where an enumeration amount direct represents a direct synchronization status, index represents an indirect synchronization status, and temp represents a temporary synchronization status. Therefore, when the first base station receives the SIB1, the base station synchronization status of the second base station can be acquired by parsing the status information element.
Step S140, if there is a second base station that detects a GNSS signal, determining a synchronization target base station according to a preset screening rule.
The preset screening rule is to determine a synchronization target base station by using the signal strength, and select a second base station with the strongest signal strength as the synchronization target base station for time synchronization, where it is understood that there is a second base station detecting GNSS signals in the cellular network, and among the plurality of second base stations, the second base station with the strongest signal strength for receiving the synchronization broadcast block is used as the synchronization target base station. It should be noted that the Signal strength can be characterized by Reference Signal Received Power (RSRP), and the higher the Reference Signal Receiving Power is, the stronger the Signal strength is. Since signal quality = signal strength/interference strength, that is, the signal strength is proportional to the signal quality while the interference strength remains unchanged, the synchronization target base station may be determined according to the signal quality in the preset screening condition.
In an embodiment, the base station synchronization states of the plurality of second base stations are all direct synchronization states, and when the first base station receives the synchronization broadcast block from the second base station, the reference signal reception power for receiving the synchronization broadcast block can be determined, so that the second base station corresponding to the synchronization broadcast block with the largest reference signal reception power is used as the synchronization target base station.
In an embodiment, the base station synchronization states of the plurality of second base stations are all indirect synchronization states, and similarly, the second base station corresponding to the synchronization broadcast block with the maximum reference signal received power may be used as the synchronization target base station.
In an embodiment, in the plurality of second base stations, if there is a portion of the second base stations whose base station synchronization status is a direct synchronization status and another portion of the second base stations are an indirect synchronization status, the second base station corresponding to the synchronization broadcast block with the largest reference signal received power is selected as the synchronization target base station from the portion of the second base stations whose base station synchronization status is the direct synchronization status.
And step S150, according to the propagation delay with the synchronous target base station, carrying out time synchronization based on the synchronous broadcast block sent by the synchronous target base station.
The wireless base station detects signals of other adjacent wireless base stations to determine the adjacent wireless base stations serving as synchronous references, propagation delay exists in signal transmission due to the fact that fixed distances exist among the wireless base stations, and the receiving time point of the synchronous signals of the first base station and the transmitting time point of the synchronous signals of the second base station lag. In the application, the time can be compensated according to the propagation delay of the first base station and the synchronization target base station, so that the first base station and the synchronization target base station can realize time synchronization.
As for the method of performing the time compensation, the present application provides three methods as follows: static configuration method, path loss estimation method and access measurement method.
As shown in fig. 3, in an embodiment, the propagation delay may be determined by a static configuration method, it is conceivable that pre-stored compensation information corresponding to cells of the wireless base station is stored in a local database of the first base station, the wireless base station corresponds to one or more cells, and each individual Cell uses a different Cell ID, so that in the pre-stored compensation information, the Cell identification and the propagation delay are corresponding, it is conceivable that the deployment and topology of each wireless base station are fixed, and the propagation delay of signals between each wireless base station may be obtained by pre-measurement and may be stored in local data for searching.
If the first base station acquires the synchronization broadcast block sent by the second base station as the synchronization target base station, the Cell identity (Cell ID) associated with the second base station may be determined according to the synchronization broadcast block, and if the Synchronization Signal (SS) of the synchronization broadcast block broadcast by the second base station carries the associated Cell ID, the Cell ID may be acquired by parsing the synchronization signal. And according to the cell identification, the first base station searches the pre-stored compensation information of the local database so as to determine the corresponding propagation delay. The first base station compensates the receiving time by the propagation delay determined according to the pre-stored compensation information, and obtains the sending time of the second base station for sending the synchronous broadcast block, so that the time synchronization can be carried out between the first base station and the second base station, and the uniform sending of signals is realized. It should be noted that the pre-stored compensation information may be stored in the local database in the form of a list, a table, or the like, and the application is not limited thereto.
As shown in fig. 4, in an embodiment, the first base station using the path loss estimation method can determine the reference signal received power for receiving the synchronization broadcast block by detecting the synchronization signal of the synchronization broadcast block, and can also obtain the transmission power of the synchronization signal by decoding the system message of the synchronization target base station, such as the information of the transmission power stored in the first system message block SIB1, so that the transmission power of the synchronization signal can be obtained by decoding the first system message block SIB 1. The path loss power can be determined by the difference between the received power and the transmitted power. And substituting the path loss power into the path loss model to obtain the corresponding propagation distance.
The corresponding expression of the path loss model is as follows:
PL=20lg(f)+20lg(d)+32.4
wherein, PL is the path loss power, f is the central frequency point of the signal, and d is the propagation distance. Since the transmission rate of the electromagnetic wave in the channel is known, the propagation delay can be determined by combining the propagation distance, and therefore, the first base station performs time compensation according to the determined propagation delay, and it is conceivable that, when detecting the synchronization signal, the receiving time can be determined, and therefore, the receiving time is compensated, and the transmitting time is determined, so that the first base station can perform time synchronization with the second base station, thereby realizing simultaneous transmission.
As shown in fig. 5, in an example, the Access measurement rule is that the first base station obtains configuration information of Random Access by decoding a system message block sent by the second base station, and the configuration information is stored in a first system message block SIB1, for example, in a 5G air interface mode, so that after the first base station detects the configuration information of Random Access, the first base station sends a Physical Random Access Channel (PRACH) request to the second base station to establish a Random Access connection, and the second base station sends a Random Access Response (RAR) to the first base station through the above-mentioned Channel. In the RAR, a first base station determines a round-trip time between the first base station and a second base station by extracting a timing advance TA of a Medium Access Control (MAC) sublayer, and half of the round-trip time is used as a propagation delay of the first base station and the second base station, so as to compensate a receiving time and further determine a transmitting time, so that time synchronization is performed between the first base station and the second base station, and synchronous transmission is realized.
According to the scheme, the first base station judges whether time synchronization can be directly carried out according to time service information associated with the GNSS signals or not by detecting the GNSS signals, and can acquire synchronization state information and a synchronization broadcast block sent by the second base station under the condition that the GNSS signals cannot be detected, and also carry out time compensation according to propagation delay between the wireless base stations, so that the first base station and the second base station can keep synchronization, and the first base station can also be used as a synchronization target base station of other wireless base stations, so that the adjacent wireless base stations can keep synchronization, further all the wireless base stations in the cellular network can keep synchronization, synchronous signal emission is realized, signal dislocation is avoided, and influence on system performance is reduced.
In an embodiment, the frame number information includes a system frame number, a subframe number, and the like, and in the frame number information transmitted by the first base station to the adjacent wireless base station, the system frame number thereof needs to be aligned with the frame number information of the synchronization broadcast block transmitted by the synchronization target base station. The system frame number is calculated as follows:
SFN=Floor(0.1*(Tcurrent-Tref))mod 1024
SubfameNumber=Floor(Tcurrent-Tref)mod 1024
wherein, SFN (System Frame number) is a system Frame number, the value of the system Frame is circularly increased by 1024 as a period, and the time length is 10 ms; subframe number is a subframe number, 10 continuous subframes form a system frame, and the time length of the subframe is 1 ms; the Tcurrent is the current same time UTC or the local current time of the current world provided by the GNSS; tref is a reference control time, which is generally selected from 1 month, 1 day and 0 year 1900.
The wireless base station receiving the GNSS signal may determine a system frame number according to the above-described manner for determining the timing time, and it is conceivable that, in a case where the first base station maintains synchronization with the GNSS, frame number information included in a synchronization broadcast block transmitted by the first base station to an adjacent wireless base station is aligned with frame number information determined according to the GNSS signal; and under the condition that the first base station and the second base station keep synchronous, the frame number information included in the synchronous broadcast block transmitted to the adjacent wireless base station by the first base station is aligned with the frame number information of the second base station.
In an embodiment, in the absence of the second base station that detects the GNSS signal, that is, the base station synchronization states of the second base stations are all temporary synchronization states, the second base station that receives the synchronization broadcast block with the strongest signal strength may be selected as the synchronization target base station.
The first base station and the second base station are in a temporary synchronization state, the second base station can perform unified time service according to the other base stations and can serve as a synchronization target base station of the first base station, and the first base station performs time synchronization based on the second base station and is aligned with the second base station in time. When the first base station receives the synchronization state information and the synchronization broadcast block from the plurality of second base stations, the first base station selects the second base station with the strongest signal of the received synchronization broadcast block as a synchronization target base station for time synchronization.
It should be noted that, in the case where the first base station does not detect a GNSS signal and detects a synchronization broadcast block broadcasted by any neighboring radio base station, the first base station may also autonomously time and transmit the synchronization broadcast block to the neighboring radio base station, that is, the first base station may serve as a synchronization target base station of the neighboring radio base station, thereby performing time synchronization.
Fig. 6 is a schematic diagram of a wireless base station updating a base station synchronization state according to an embodiment of the present disclosure, in an embodiment, the wireless base station updates the base station synchronization state periodically, for example, the first base station updates the base station synchronization state every other timing period, it is conceivable that the base station synchronization state of the first base station is updated to a direct synchronization state when the first base station detects a GNSS signal; when the first base station detects a second base station in a direct synchronization state or an indirect synchronization state, namely the second base station in the direct synchronization state or the indirect synchronization state is taken as a synchronization target base station, the base station synchronization state of the first base station is updated to be in the indirect synchronization state; when the second base station in the direct synchronization state or the indirect synchronization state is not detected, the base station synchronization state of the first base station is updated to a temporary synchronization state; and when the current base station synchronization state of the first base station is a direct synchronization state and no GNSS signal is detected, updating the base station synchronization state of the first base station to an indirect synchronization state.
Fig. 7 is a flowchart illustrating a wireless base station updating a base station synchronization status according to an embodiment of the present disclosure, where in a wireless base station, when the wireless base station detects a GNSS signal, the wireless base station may obtain corresponding time service information so as to synchronize with the GNSS, and the base station status of the wireless base station is updated to a direct synchronization status.
When the wireless base station does not detect the GNSS signal, the wireless base station detects synchronization state information broadcast by an adjacent wireless base station (i.e., a second base station), so as to obtain a base station synchronization state of the adjacent wireless base station, the second base station which detects the GNSS signal exists in the adjacent wireless base station, the wireless base station screens out a synchronization target base station, if the synchronization target base station is determined by RSRP, the wireless base station performs time compensation according to propagation delay with the synchronization target base station and a synchronization broadcast block broadcast by the synchronization target base station, so as to achieve time synchronization between the wireless base station and the synchronization target base station, and the base station synchronization state of the wireless base station is updated to an indirect synchronization state.
When there is no second base station that detects a GNSS signal in the adjacent wireless base stations, the wireless base station may determine a time boundary by itself according to its own clock, that is, autonomously timing, and then the base station synchronization state of the wireless base station is updated to a temporary synchronization state. Fig. 8 is a schematic structural diagram of a wireless base station time synchronization apparatus according to an embodiment of the present application, the apparatus is configured to execute the wireless base station time synchronization method provided in the foregoing embodiment, and has application modules and beneficial effects corresponding to the execution method, as shown in the figure, the wireless base station time synchronization apparatus includes:
a signal detection module 201 configured to detect GNSS signals;
an information obtaining module 202, configured to obtain synchronization status information of at least one second base station if no GNSS signal is detected;
a base station detection module 203 configured to determine whether there is a second base station in the cellular network that detects the GNSS signal according to the synchronization status information;
a base station determining module 204, configured to determine a synchronization target base station according to a preset screening rule if there is a second base station that detects a GNSS signal;
the time synchronization module 205 is configured to perform time synchronization based on a synchronization broadcast block sent by the synchronization target base station according to the propagation delay with the synchronization target base station.
On the basis of the above embodiment, the synchronization status information is used to indicate a base station synchronization status of the second base station to determine whether to synchronize to the GNSS signal, where the base station synchronization status includes a direct synchronization status, an indirect synchronization status, or a temporary synchronization status;
the base station detection module 203 is further configured to:
determining whether the base station synchronization state of the second base station is a direct synchronization state or an indirect synchronization state;
if the state is a direct synchronization state, determining that a second base station which detects the GNSS signal exists in the cellular network;
and if the state is an indirect synchronization state, determining that a second base station which completes time synchronization with other second base stations detecting the GNSS signals exists in the cellular network.
On the basis of the foregoing embodiment, the base station determining module 204 is further configured to:
and if the second base stations which detect the GNSS signals exist and the number of the second base stations which detect the GNSS signals is at least two, taking the second base station which receives the synchronous broadcast block and has the strongest signal intensity as the synchronous target base station.
On the basis of the above embodiment, the time synchronization module 205 is further configured to:
determining a cell identifier of a second base station as a synchronization target base station according to the synchronization broadcast block;
according to the cell identification, searching prestored compensation information of a local database, and determining propagation delay;
and determining the sending time according to the propagation delay and the receiving time of the received synchronous broadcast block so as to carry out time synchronization.
On the basis of the above embodiment, the time synchronization module 205 is further configured to:
detecting a synchronous signal of a synchronous broadcast block, and determining the reference signal receiving power of the received synchronous broadcast block;
decoding system information sent by a synchronous target base station, and determining the transmitting power of a synchronous broadcast block;
determining the path loss power according to the reference signal receiving power and the transmitting power;
determining propagation delay according to the path loss power and the path loss model;
and determining the sending time according to the propagation delay and the receiving time of the received synchronous broadcast block so as to carry out time synchronization.
On the basis of the above embodiment, the time synchronization module 205 is further configured to:
acquiring configuration information for random access with a synchronous target base station according to system information sent by the synchronous target base station;
according to the configuration information, sending a physical random access channel to the synchronous target base station, and receiving a random access response sent by an adjacent base station;
acquiring timing advance according to the random access response, and determining propagation delay;
and determining the sending time according to the propagation delay and the receiving time of the received synchronous broadcast block so as to carry out time synchronization.
On the basis of the above embodiment, the time synchronization module 205 is further configured to: and aligning the generated system frame number with the frame number information contained in the synchronous broadcast block sent by the synchronous target base station.
On the basis of the foregoing embodiment, the base station detecting module 203 is further configured to:
and if the second base station which detects the GNSS signals does not exist, selecting the second base station which receives the synchronous broadcast block and has the strongest signal intensity as the synchronous target base station.
On the basis of the foregoing embodiment, the base station detecting module 203 is further configured to:
and if the GNSS signal is detected, acquiring time service information according to the GNSS signal, and performing time synchronization.
It should be noted that, in the embodiment of the time synchronization apparatus for a wireless base station, each included unit is only divided according to functional logic, but is not limited to the above division, as long as the corresponding function can be implemented; in addition, specific names of the functional units are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the application.
Fig. 9 is a schematic structural diagram of a wireless base station time synchronization apparatus according to an embodiment of the present application, where the apparatus is configured to execute the wireless base station time synchronization method provided in the foregoing embodiment, and has an execution method and corresponding functional modules and beneficial effects, as shown in the figure, the wireless base station time synchronization apparatus includes a processor 301, a memory 302, an input device 303, and an output device 304, where the number of the processors 301 in the apparatus may be one or more, and a single processor 301 is taken as an example in the figure; the processor 301, the memory 302, the input device 303 and the output device 304 may be connected by a bus or other means, and the bus connection is taken as an example in the figure. The memory 302 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the wireless base station time synchronization method in the embodiment of the present application. The processor 301 executes various functional applications of the device and data processing by running software programs, instructions, and modules stored in the memory 302, that is, implements the above-described wireless base station time synchronization method. The input device 303 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the apparatus. The output device 304 may include a radio frequency module or the like having a function of transmitting data or signals.
The embodiment of the present application further provides a storage medium storing computer-executable instructions, which are executed by a computer processor to perform the time synchronization method of the wireless base station according to the above embodiment.
Computer-readable storage media, including both permanent and non-permanent, removable and non-removable media, may implement the information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that 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 defined 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.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the appended claims.
Claims (10)
1. A method for time synchronization of radio base stations, the method being performed by a first base station, the first base station and at least one second base station forming a cellular network, the method comprising:
detecting a GNSS signal;
if the GNSS signal is not detected, acquiring synchronous state information of at least one second base station;
determining from the synchronization status information whether there is the second base station in the cellular network that detects the GNSS signal;
if the second base station detecting the GNSS signal exists, determining a synchronous target base station according to a preset screening rule;
and carrying out time synchronization based on the synchronous broadcast block sent by the synchronous target base station according to the propagation delay with the synchronous target base station.
2. The method according to claim 1, wherein the synchronization status information is used to indicate a base station synchronization status of the second base station to determine whether to synchronize with the GNSS signal, and the base station synchronization status comprises a direct synchronization status, an indirect synchronization status, or a temporary synchronization status;
the determining whether the second base station detecting the GNSS signal is present in the cellular network according to the synchronization state information includes:
determining whether a base station synchronization status of the second base station is the direct synchronization status or the indirect synchronization status;
if the direct synchronization state is the direct synchronization state, determining that the second base station which detects the GNSS signal exists in the cellular network;
and if the received signal is in the indirect synchronization state, determining that the second base station which completes time synchronization with other second base stations which detect the GNSS signal exists in the cellular network.
3. The method as claimed in claim 2, wherein the determining a synchronization target bs according to a predetermined filtering rule if there is the second bs detecting the GNSS signal comprises:
and if the second base stations which detect the GNSS signals exist and the number of the second base stations which detect the GNSS signals is at least two, taking the second base station which receives the synchronous broadcast block and has the strongest signal intensity as the synchronous target base station.
4. The method for time synchronization of a wireless base station according to claim 1, wherein the time synchronization based on the synchronized broadcast block transmitted from the synchronization target base station according to the propagation delay with the synchronization target base station comprises:
determining a cell identifier of the second base station as the synchronization target base station according to the synchronization broadcast block;
according to the cell identification, pre-stored compensation information of a local database is retrieved, and the propagation delay is determined;
determining a sending time according to the propagation delay and a receiving time for receiving the synchronous broadcast block so as to carry out time synchronization;
or, detecting a synchronization signal of the synchronization broadcast block, and determining a reference signal received power of the synchronization broadcast block;
decoding system information sent by the synchronous target base station, and determining the transmitting power of the synchronous broadcast block;
determining path loss power according to the reference signal receiving power and the transmitting power;
determining the propagation delay according to the path loss power and the path loss model;
determining a sending time according to the propagation delay and a receiving time for receiving the synchronous broadcast block so as to carry out time synchronization;
or acquiring configuration information for random access with the synchronous target base station according to the system information sent by the synchronous target base station;
according to the configuration information, sending a physical random access channel to the synchronous target base station, and receiving a random access response sent by the synchronous target base station;
acquiring timing advance according to the random access response, and determining propagation delay;
and determining the sending time according to the propagation delay and the receiving time of receiving the synchronous broadcast block so as to carry out time synchronization.
5. The method of claim 4, wherein after the determining the transmission time for time synchronization based on the propagation delay and the reception time for receiving the synchronization broadcast block, the method further comprises:
and aligning the generated system frame number with the frame number information contained in the synchronous broadcast block sent by the synchronous target base station.
6. The radio base station time synchronization method according to claim 1, further comprising:
and if the second base station which detects the GNSS signal does not exist, selecting the second base station which receives the synchronous broadcast block and has the strongest signal intensity as the synchronous target base station.
7. The radio base station time synchronization method according to claim 1, further comprising:
and if the GNSS signal is detected, acquiring time service information according to the GNSS signal, and performing time synchronization.
8. A wireless base station time synchronization apparatus, wherein a first base station and at least one second base station form a cellular network, the apparatus comprising:
a signal detection module configured to detect a GNSS signal;
an information obtaining module configured to obtain synchronization status information of at least one of the second base stations if the GNSS signal is not detected;
a base station detection module configured to determine whether there is the second base station in the cellular network that detected the GNSS signal according to the synchronization status information;
a base station determination module configured to determine a synchronization target base station according to a preset screening rule if the second base station detecting the GNSS signal exists;
and the time synchronization module is configured to perform time synchronization based on the synchronous broadcast block sent by the synchronous target base station according to the propagation delay with the synchronous target base station.
9. A wireless base station time synchronization apparatus, characterized in that the apparatus comprises:
one or more processors;
storage means for storing one or more programs;
when executed by one or more of the processors, cause the one or more processors to implement the radio base station time synchronization method of any of claims 1-7.
10. A storage medium storing computer executable instructions, which when executed by a computer processor, are for performing the radio base station time synchronization method of any of claims 1-7.
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