CN113852998B - Cell switching method based on clock synchronization, terminal and network side equipment - Google Patents
Cell switching method based on clock synchronization, terminal and network side equipment Download PDFInfo
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- CN113852998B CN113852998B CN202010598071.1A CN202010598071A CN113852998B CN 113852998 B CN113852998 B CN 113852998B CN 202010598071 A CN202010598071 A CN 202010598071A CN 113852998 B CN113852998 B CN 113852998B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
- H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0055—Transmission or use of information for re-establishing the radio link
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
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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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- 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 invention provides a cell switching method, a terminal and network side equipment based on clock synchronization, wherein the method comprises the following steps: receiving clock synchronization messages sent by first network side equipment, wherein the clock synchronization messages comprise clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with the clock source; recording the clock quality into a measurement report, and sending the measurement report to second network side equipment so that the second network side equipment determines whether the cell switching condition is met according to the clock quality; receiving a cell switching instruction sent by second network side equipment, and executing cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the cell switching condition. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal and the corresponding next-stage equipment is accurately synchronized through cell switching.
Description
Technical Field
The present invention relates to the field of wireless communications technologies, and in particular, to a cell switching method, a terminal, and a network side device based on clock synchronization.
Background
In the field of mobile communication, one application scenario among many vertical industries in 5G is that a terminal recovers UTC time by wireless air dictation and outputs the UTC time to a user device, such as a data transmission unit (Data Transfer Unit, DTU) and a pressure measurement unit (Pressure Measuring Unit, PMU) in the field of power application. The 5G wireless air interface teaching time mode refers to that the 5G terminal UE recovers accurate time information by receiving signals sent by a base station, and transmits the accurate time to PMU/DTU equipment and the like through IRIG-B time information interface protocol. Meanwhile, the PMU/DTU data can be transmitted to the network side through the UE.
When the clock source of the wireless base station such as GPS works abnormally, the clock state of the base station enters a holding state, the clock phase is maintained by the local crystal oscillator, and the base station can continue to provide service. However, in this state, the clock phase of the base station is more and more out of phase with the standard time, so that the clock phase recovered by the UE under the base station is inaccurate. The UE which uses the 5G wireless time service to recover the base station time and provides the clock output has higher synchronous precision requirements of some corresponding devices under some scenes, for example, the DTU requires 1us synchronous precision. While the clock state of the base station is a hold state, although the cell service can be continuously provided, the phase deviation of the base station in the hold state is larger and larger with the increase of the hold duration. Assuming that the clock state of the base station of the serving cell where the UE is currently located is in a holding state, as the holding time increases, the clock of the base station itself has a certain deviation, and when 1us or 2us is reached, the clock synchronization precision of the equipment corresponding to the UE is finally affected.
In the prior art, when the base station cannot keep synchronization with the clock source, the clock synchronization of the terminal UE under the serving cell and the corresponding next-stage device is not accurate enough.
Disclosure of Invention
The embodiment of the invention aims to provide a cell switching method, a terminal and network side equipment based on clock synchronization, which are used for solving the problem that when first network side equipment cannot keep synchronization with a clock source, the clock synchronization of terminal UE (user equipment) in a service cell and corresponding next-stage equipment is not accurate enough.
In order to solve the technical problems, the embodiment of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a cell handover method based on clock synchronization, which is applied to a terminal, and includes:
receiving clock synchronization messages sent by first network side equipment, wherein the clock synchronization messages comprise clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
recording the clock quality into a measurement report, and sending the measurement report to second network side equipment, so that the second network side equipment determines whether preset cell switching conditions are met according to the clock quality of each first network side equipment;
Receiving a cell switching instruction sent by the second network side equipment, and executing a cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition.
In a second aspect, an embodiment of the present invention further provides a cell handover method based on clock synchronization, which is applied to a first network side device, and includes:
obtaining clock quality according to the current state of clock synchronization with a clock source, recording the clock quality in a clock synchronization message and sending the clock quality to a terminal, so that the terminal records the clock quality in a measurement report and sends the measurement report to second network side equipment, and the second network side equipment determines whether preset cell switching conditions are met or not according to the clock quality of each first network side equipment so as to send a cell switching instruction to the terminal.
In a third aspect, an embodiment of the present invention further provides a cell handover method based on clock synchronization, which is applied to a second network side device, including:
receiving a measurement report sent by a terminal, wherein the measurement report comprises clock quality of each first network side device; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
And determining whether preset cell switching conditions are met according to the clock quality of each first network side device so as to send a cell switching instruction to the terminal, so that the terminal executes cell switching operation.
In a fourth aspect, an embodiment of the present invention provides a terminal for cell handover based on clock synchronization, including:
the message receiving module is used for receiving clock synchronization messages sent by the first network side devices, and the clock synchronization messages comprise clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
the report sending module is used for recording the clock quality into a measurement report and sending the measurement report to second network side equipment so that the second network side equipment can determine whether preset cell switching conditions are met or not according to the clock quality of each first network side equipment;
the instruction processing module is used for receiving a cell switching instruction sent by the second network side equipment and executing cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition.
In a fifth aspect, an embodiment of the present invention further provides a first network side device for cell handover based on clock synchronization, including:
the clock synchronization module is used for obtaining clock quality according to the current state of clock synchronization with the clock source, recording the clock quality in a clock synchronization message and sending the clock quality to the terminal, so that the terminal records the clock quality in a measurement report and sends the measurement report to the second network side equipment, and the second network side equipment determines whether preset cell switching conditions are met or not according to the clock quality of each first network side equipment so as to send a cell switching instruction to the terminal.
In a sixth aspect, an embodiment of the present invention further provides a second network side device for cell handover based on clock synchronization, including:
a report receiving module, configured to receive a measurement report sent by a terminal, where the measurement report includes clock quality of each first network side device; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
and the instruction sending module is used for determining whether preset cell switching conditions are met according to the clock quality of each first network side device so as to send a cell switching instruction to the terminal, so that the terminal can execute cell switching operation.
As can be seen from the technical solutions provided by the above embodiments of the present invention, in the embodiments of the present invention, a clock synchronization message sent by each first network side device is received, where the clock synchronization message includes clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source; recording the clock quality into a measurement report, and sending the measurement report to second network side equipment, so that the second network side equipment determines whether preset cell switching conditions are met according to the clock quality of each first network side equipment; receiving a cell switching instruction sent by the second network side equipment, and executing a cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal UE and the corresponding next-stage equipment is accurately synchronized through cell switching.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a first cell handover method based on clock synchronization according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a second flow chart of a cell handover method based on clock synchronization according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a third flow chart of a cell handover method based on clock synchronization according to an embodiment of the present invention;
fig. 4 is a fourth flowchart of a cell handover method based on clock synchronization according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a fifth flow chart of a cell handover method based on clock synchronization according to an embodiment of the present invention;
fig. 6 is a schematic diagram of module composition of a terminal for cell handover based on clock synchronization according to an embodiment of the present invention;
fig. 7 is a schematic diagram of module composition of a first network side device for cell handover based on clock synchronization according to an embodiment of the present invention;
fig. 8 is a schematic diagram of module composition of a second network side device for cell handover based on clock synchronization according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a cell switching method and device based on clock synchronization and electronic equipment.
In order to make the technical solution of the present invention better understood by those skilled in the art, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, shall fall within the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a cell handover method based on clock synchronization, where an execution body of the method may be a terminal UE, where the terminal UE may receive a message sent by a first network side device of a serving cell and a first network side device of other neighboring cells, and the terminal is connected to a next stage device DTU and PMU. The first network side equipment is a base station and comprises a base station of a service cell where the terminal is located and base stations of all adjacent cells. The method specifically comprises the following steps:
step S01, receiving clock synchronization messages sent by first network side equipment, wherein the clock synchronization messages comprise clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with the clock source.
The first network side equipment keeps accurate clocks by performing clock synchronization operation with clock sources such as GPS or 1588, a state that the first network side equipment and the clock sources are normally in clock synchronization operation is called a locking state, and a state that the first network side equipment and the clock sources cannot perform clock synchronization operation is called a holding state. In the clock synchronization process, clock information acquired by the first network side equipment from a clock source comprises absolute time, leap seconds and the like. Meanwhile, the first network side equipment obtains the current clock quality of the first network side equipment according to the current state when the first network side equipment performs clock synchronization with the clock source, wherein the current state comprises a locking state or a holding state, the duration time of the holding state and the like. And then, the first network side equipment records the clock quality into a clock synchronization message according to the requirement and sends the clock quality to the terminal UE. Besides the clock quality, the clock synchronization message can also record clock information acquired from a clock source, including absolute time, leap seconds and the like.
The terminal UE performs clock synchronization on the terminal UE according to the clock synchronization message sent by the first network side device corresponding to the serving cell, and then sends the clock synchronization message to the next-stage device for performing clock synchronization on the next-stage device, so that the clock accuracy of the terminal UE and the corresponding next-stage device is ensured. The specific synchronization process may be set according to actual needs, and only one of them is given here as an example: and the terminal UE directly extracts the clock quality in the clock synchronization message sent by the first network side equipment of the service cell, extracts absolute time from the clock synchronization message to serve as local accurate time of the terminal UE if the first network side equipment of the service cell is in a locking state according to the clock quality, and then converts the local accurate time into a required data protocol format according to a transmission protocol with next-stage equipment to be sent to the next-stage equipment for carrying out clock synchronization on the next-stage equipment.
Step S02, the clock quality is recorded in a measurement report and is sent to second network side equipment, so that the second network side equipment determines whether preset cell switching conditions are met according to the clock quality of each first network side equipment;
step S03, receiving a cell switching instruction sent by the second network side equipment, and executing a cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition.
In an implementation, after receiving the clock synchronization message sent by each first network side device, the terminal UE extracts the clock quality of each first network side device, and records the clock quality in the measurement report, so that the clock quality of each first network side device is sent to the second network side device along with the measurement report. The second network side device may be a base station of a serving cell or a related device of the core network EPC.
And the second network side equipment judges whether the measurement report of the terminal UE meets the preset cell switching condition according to the preset cell switching condition. And triggering cell switching when the preset cell switching condition is determined to be met.
The cell handover conditions in the prior art mainly include the following aspects:
1. based on signal quality: if the signal quality of the serving cell is gradually weakened according to the measurement report, and the signal quality of the adjacent cell is better and better, or the signal quality of the serving cell is suddenly changed, when the signal quality of the serving cell cannot meet the network service quality requirement of the terminal UE, the cell switching needs to be executed in order to ensure the network service quality of the terminal UE.
2. Based on the distance of the terminal UE to the first network device: if the distance between the UE and the first network side equipment of the serving cell exceeds the preset distance threshold according to the measurement report, cell switching needs to be executed.
3. Load balancing: if it is determined that the number of terminal UEs in the serving cell or the traffic volume or the data volume reaches the limited capacity of the serving cell according to the measurement report, the cell handover needs to be performed by means of load balancing.
In the embodiment of the present invention, a cell switching condition based on clock quality is added on the basis of the above cell switching condition, and the specific cell switching condition may be set according to actual needs, for example, if the first network side device representing the serving cell is in a hold state according to the clock quality of the serving cell in the measurement report, and the clock quality of the serving cell is inferior to a preset quality threshold, and the first network side device representing the neighboring cell is in a lock state according to the clock quality of the first network side device of the neighboring cell, cell switching is triggered. In addition, the clock quality may be combined with the above-described other cell handover conditions as one of the judgment conditions or judgment preconditions.
In the implementation, if the network measurement device determines that the preset cell switching condition is met according to the clock quality of each first network side device in the measurement report, a cell switching instruction is sent to the terminal UE.
And after receiving the cell switching instruction, the terminal UE executes corresponding cell switching operation.
As can be seen from the technical solutions provided by the above embodiments of the present invention, in the embodiments of the present invention, a clock synchronization message sent by each first network side device is received, where the clock synchronization message includes clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source; recording the clock quality into a measurement report, and sending the measurement report to second network side equipment, so that the second network side equipment determines whether preset cell switching conditions are met according to the clock quality of each first network side equipment; receiving a cell switching instruction sent by the second network side equipment, and executing a cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal UE and the corresponding next-stage equipment is accurately synchronized through cell switching.
Based on the above embodiment, further, as shown in fig. 2, the specific processing manner of the above step S02 may be varied, and an alternative processing manner is provided below, and in particular, the processing of S021 may be referred to below.
Step S021, if the clock quality of the first network side equipment corresponding to the service cell is worse than that of the first network side equipment corresponding to the adjacent cell, the clock quality of each first network side equipment is recorded into a measurement report and sent to the second network side equipment.
In order to reduce the data transmission amount between the terminal UE and the second network side device, the terminal UE does not need to record the clock quality of each first network side device in the measurement report sent each time, but the terminal UE determines the clock quality of each first network side device in advance.
If the clock quality characterization of the first network side device of the serving cell is in a locked state, clock synchronization can be performed on the terminal UE and the corresponding next-stage device by using a clock synchronization message sent by the first network side device of the serving cell. At this point, the clock quality need not be recorded into a measurement report.
If the first network side equipment of the service cell is in a holding state, the clock quality of the first network side equipment of the service cell is further compared with the clock quality of the first network side equipment of the adjacent cell, and if the clock quality of the first network side equipment of the service cell is not worse than the clock quality of the first network side equipment of all the adjacent cells. At this time, since there is no switchable neighboring cell, it is not necessary to record the clock quality of each first network side device into the measurement report.
If the clock quality of the first network side device of the serving cell is worse than that of the first network side device of any neighboring cell, the received clock quality of each first network side device needs to be recorded into a measurement report and sent to the second network side device to judge whether to trigger cell switching.
As can be seen from the technical solutions provided by the embodiments of the present invention, in the embodiments of the present invention, by comparing the clock quality of the first network side device of the serving cell with the clock quality of the first network side device of the neighboring cell, if the clock quality of the first network side device is worse, the clock quality of each first network side device is recorded into the measurement report. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal UE and the corresponding next-stage equipment is accurately synchronized through cell switching, and the data transmission quantity between the terminal UE and the second network side equipment is relatively reduced.
Further, the specific processing manner of the step S01 may be varied based on the above embodiment, and an alternative processing manner is provided below, and in particular, see the following processing of S011.
Step S011, receiving a clock synchronization message sent by each first network side device based on a broadcast mode or a unicast mode, where the clock synchronization message exists in a form of a referenceTimeInfo structure, and the clock quality is recorded in an uncerteainty field in the referenceTimeInfo structure.
In implementation, the manner in which each first network side device sends the clock synchronization message to the terminal UE may be set according to the current state, and specifically, the clock synchronization message may be sent based on a broadcast manner and based on a unicast manner. For example, the first network side device of the neighboring cell may transmit in a broadcast-based manner, and the first network side device of the serving cell may select to transmit in a unicast-based manner.
The clock synchronization message will be recorded in a system information block SIB message, such as SIB9 message, based on the broadcast mode. The clock synchronization message is represented in the form of a referenceTimeInfo structure by adding the referenceTimeInfo structure to the SIB message, as follows:
based on the unicast mode, the clock synchronization message is recorded in the downlink message, and the referenceTimeInfo structure is added in the downlink message as follows:
the referenceTimeInfo structure may include a plurality of fields according to information contained in the clock synchronization message, as follows:
wherein the uncerty field describes clock quality, and describes inaccuracy of the clock of the first network side device with reference to time information, and each unit is 25ns. The first network side device may fill in the field according to the current synchronization state, if the first network side device is in the locked state, the uncertainty field is 0, and if the first network side device is in the hold state, the first network side device fills in a corresponding value according to the duration of the hold state.
The technical scheme provided by the embodiment of the invention can realize that the clocks of the terminal UE and the corresponding next-stage equipment are accurately synchronized through cell switching when the first network side equipment of the service cell cannot keep synchronization with the clock source by sending the clock message synchronization message to the terminal UE in a broadcast or unicast mode.
Further, as shown in fig. 3, the specific processing manner of the step S03 may be varied, and an alternative processing manner is provided below, which may be specifically referred to as steps S031-S033 below.
Step S031, receiving a cell switching instruction sent by the second network side device:
step S032, if the cell switching instruction is a data switching instruction, switching a service cell to the adjacent cell;
step S033, if the cell switching instruction is a clock switching instruction, sending a clock synchronization message sent by the first network side device of the neighboring cell to a next-stage device, and executing a clock synchronization operation.
As can be seen from the above embodiments, when the second network side device determines that the clock quality of each first network side device in the measurement report meets the preset cell switching condition, a cell switching instruction is sent to the terminal UE, so that the terminal UE performs a cell switching operation, and switches the serving cell of the terminal UE to a neighboring cell.
In practice, in order to ensure that the terminal UE is able to maintain the rate and reliability of data transmission when achieving accurate clock synchronization. The second network side device may further divide the cell switching conditions based on the clock quality into two types, one type is to switch the serving cell, the other type is not to switch the serving cell, and the cell switching instructions corresponding to the two types of cell switching conditions are respectively a data switching instruction and a clock switching instruction.
If the cell switching instruction received by the terminal UE is a data switching instruction, switching the serving cell of the terminal UE to a neighboring cell, where data transmission and clock synchronization of the terminal UE are performed by a first network side device of the neighboring cell.
If the cell switching instruction received by the terminal UE is a clock switching instruction, the serving cell of the terminal UE does not need to be switched, and at this time, data transmission of the terminal UE is still performed through the first network side device of the serving cell, and the clock is synchronously handed over to the first network side device of the neighboring cell. Equivalently, clock synchronization between the terminal UE and the next-stage device is achieved by using the clock synchronization message received from the neighboring cell.
The technical scheme provided by the embodiment of the invention can be seen that the embodiment of the invention divides the cell switching instruction into the data switching instruction and the clock switching instruction, so that the data transmission efficiency of the terminal UE is ensured on the basis that the clocks of the terminal UE and the corresponding next-stage equipment are accurately synchronized through cell switching when the first network side equipment of the service cell cannot keep synchronization with the clock source.
As shown in fig. 4, the embodiment of the present invention further provides a cell handover method based on clock synchronization, where an execution body of the method may be a first network side device. The method specifically comprises the following steps:
and S11, obtaining clock quality according to the current state of clock synchronization with a clock source, recording the clock quality in a clock synchronization message and sending the clock quality to a terminal, so that the terminal records the clock quality in a measurement report and sends the measurement report to second network side equipment, and the second network side equipment determines whether preset cell switching conditions are met or not according to the clock quality of each first network side equipment so as to send a cell switching instruction to the terminal.
The first network side equipment keeps accurate clocks by performing clock synchronization operation with clock sources such as GPS or 1588. In the clock synchronization process, the first network side equipment acquires clock information from a clock source, and meanwhile, the first network side equipment obtains the current clock quality of the first network side equipment according to the current state when the first network side equipment performs clock synchronization with the clock source. And then, the first network side equipment records the clock quality into a clock synchronization message according to the requirement and sends the clock quality to the terminal UE. In addition to the clock quality, the clock synchronization message may also record clock information obtained from a clock source.
The terminal UE performs clock synchronization on the terminal UE according to the clock synchronization message sent by the first network side equipment of the service cell, and then sends the clock synchronization message to the next-stage equipment for performing clock synchronization on the next-stage equipment, so that the clock accuracy of the terminal UE and the corresponding next-stage equipment is ensured.
After receiving the clock synchronization message sent by each first network side device, the terminal UE extracts the clock quality of each first network side device, and records the clock quality in the measurement report, so that the clock quality of each first network side device is sent to the second network side device along with the measurement report.
And the second network side equipment judges whether the measurement report of the terminal UE meets the preset cell switching condition according to the preset cell switching condition. And triggering cell switching when the preset cell switching condition is determined to be met.
The specific cell handover condition may be set according to actual needs, for example, if the first network side device representing the serving cell is in a hold state according to the clock quality of the serving cell in the measurement report, and the clock quality of the serving cell is inferior to a preset quality threshold, and the first network side device representing the neighboring cell is in a lock state according to the clock quality of the first network side device of the neighboring cell, then triggering cell handover. In addition, the clock quality may be combined with other cell switching conditions as one of the judgment conditions or judgment preconditions.
In the implementation, if the network measurement device determines that the preset cell switching condition is met according to the clock quality of each first network side device in the measurement report, a cell switching instruction is sent to the terminal UE.
And after receiving the cell switching instruction, the terminal UE executes corresponding cell switching operation.
As can be seen from the technical solutions provided in the embodiments of the present invention, clock quality is obtained according to a current state of clock synchronization with a clock source, and the clock quality is recorded in a clock synchronization message and sent to a terminal, so that the terminal records the clock quality in a measurement report and sends the measurement report to a second network side device, so that the second network side device determines, according to the clock quality of each first network side device, whether a preset cell switching condition is satisfied, and sends a cell switching instruction to the terminal. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal UE and the corresponding next-stage equipment is accurately synchronized through cell switching.
Based on the above embodiment, further, the obtaining clock quality according to the current state of clock synchronization with the clock source, and recording the clock quality in a clock synchronization message and sending the clock quality to the terminal includes:
Obtaining clock quality according to the current state of clock synchronization with a clock source, and recording the clock quality in an uncerteainty field in a referenceTimeInfo structure;
and sending the referenceTimeInfo structure body to the terminal as a clock synchronization message based on a broadcasting mode or a unicast mode.
In implementation, the manner in which each first network side device sends the clock synchronization message to the terminal UE may be set according to the current state, and specifically, the clock synchronization message may be sent based on a broadcast manner and based on a unicast manner. For example, the first network side device of the neighboring cell may transmit in a broadcast-based manner, and the first network side device of the serving cell may select to transmit in a unicast-based manner.
The clock synchronization message will be recorded in a system information block SIB message, such as SIB9 message, based on the broadcast mode. The clock synchronization message is represented in the form of a referenceTimeInfo structure by adding the referenceTimeInfo structure to the SIB message.
Based on the unicast mode, the clock synchronization message is recorded in the downlink message, and the referenceTimeInfo structure is added in the downlink message.
The receferencetimeinfo structure may include a plurality of fields according to information included in the clock synchronization message, wherein an uncertainty field describes a clock quality, and inaccuracy of the clock of the first network side device is described with reference to time information, each unit being 25ns. The first network side device may fill in the field according to the current synchronization state, if the first network side device is in the locked state, the uncertainty field is 0, and if the first network side device is in the hold state, the first network side device fills in a corresponding value according to the duration of the hold state.
The technical scheme provided by the embodiment of the invention can realize that the clocks of the terminal UE and the corresponding next-stage equipment are accurately synchronized through cell switching when the first network side equipment of the service cell cannot keep synchronization with the clock source by sending the clock message synchronization message to the terminal UE in a broadcast or unicast mode.
As shown in fig. 5, the embodiment of the present invention further provides a cell handover method based on clock synchronization, where an execution body of the method may be a second network side device. The method specifically comprises the following steps:
step S21, receiving a measurement report sent by a terminal, wherein the measurement report comprises clock quality of each first network side device; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
Step S22, according to the clock quality of each first network side device, determining whether a preset cell switching condition is met or not, so as to send a cell switching instruction to the terminal, so that the terminal executes cell switching operation.
The first network side equipment keeps accurate clocks by performing clock synchronization operation with clock sources such as GPS or 1588. In the clock synchronization process, the first network side equipment acquires clock information from a clock source, and meanwhile, the first network side equipment obtains the current clock quality of the first network side equipment according to the current state when the first network side equipment performs clock synchronization with the clock source. And then, the first network side equipment records the clock quality into a clock synchronization message according to the requirement and sends the clock quality to the terminal UE. In addition to the clock quality, the clock synchronization message may also record clock information obtained from a clock source.
The terminal UE performs clock synchronization on the terminal UE according to the clock synchronization message sent by the first network side equipment of the service cell, and then sends the clock synchronization message to the next-stage equipment for performing clock synchronization on the next-stage equipment, so that the clock accuracy of the terminal UE and the corresponding next-stage equipment is ensured.
After receiving the clock synchronization message sent by each first network side device, the terminal UE extracts the clock quality of each first network side device, and records the clock quality in the measurement report, so that the clock quality of each first network side device is sent to the second network side device along with the measurement report.
And the second network side equipment judges whether the measurement report of the terminal UE meets the preset cell switching condition according to the preset cell switching condition. And triggering cell switching when the preset cell switching condition is determined to be met.
The specific cell handover condition may be set according to actual needs, for example, if the first network side device representing the serving cell is in a hold state according to the clock quality of the serving cell in the measurement report, and the clock quality of the serving cell is inferior to a preset quality threshold, and the first network side device representing the neighboring cell is in a lock state according to the clock quality of the first network side device of the neighboring cell, then triggering cell handover. In addition, the clock quality may be combined with other cell switching conditions as one of the judgment conditions or judgment preconditions.
In the implementation, if the network measurement device determines that the preset cell switching condition is met according to the clock quality of each first network side device in the measurement report, a cell switching instruction is sent to the terminal UE.
And after receiving the cell switching instruction, the terminal UE executes corresponding cell switching operation.
As can be seen from the technical solutions provided by the above embodiments of the present invention, in the embodiments of the present invention, a measurement report sent by a terminal is received, where the measurement report includes clock quality of each first network side device; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source; and determining whether preset cell switching conditions are met according to the clock quality of each first network side device so as to send a cell switching instruction to the terminal, so that the terminal executes cell switching operation. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal UE and the corresponding next-stage equipment is accurately synchronized through cell switching.
According to the method for cell switching based on clock synchronization provided in the foregoing embodiments, based on the same technical concept, the embodiment of the present invention further provides a cell switching device based on clock synchronization, and fig. 6 is a schematic block diagram of a terminal for cell switching based on clock synchronization provided in the embodiment of the present invention, where the cell switching device based on clock synchronization is used to execute the method for cell switching based on clock synchronization described in fig. 1 to 3, and as shown in fig. 6, the cell switching device based on clock synchronization includes: a message receiving module 601, a report transmitting module 602, and an instruction processing module 603.
The message receiving module 601 is configured to receive a clock synchronization message sent by each first network side device, where the clock synchronization message includes clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source; the report sending module 602 is configured to record the clock quality into a measurement report, and send the measurement report to a second network side device, so that the second network side device determines whether a preset cell handover condition is met according to the clock quality of each first network side device; an instruction processing module 603, configured to receive a cell handover instruction sent by the second network side device, and perform a cell handover operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition.
As can be seen from the technical solutions provided by the above embodiments of the present invention, in the embodiments of the present invention, a clock synchronization message sent by each first network side device is received, where the clock synchronization message includes clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source; recording the clock quality into a measurement report, and sending the measurement report to second network side equipment, so that the second network side equipment determines whether preset cell switching conditions are met according to the clock quality of each first network side equipment; receiving a cell switching instruction sent by the second network side equipment, and executing a cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal UE and the corresponding next-stage equipment is accurately synchronized through cell switching.
Optionally, the report sending module is specifically configured to record the clock quality of each first network side device into a measurement report and send the measurement report to the second network side device if the clock quality of the first network side device corresponding to the serving cell is worse than the clock quality of the first network side device corresponding to the neighboring cell.
Optionally, the above message receiving module is specifically configured to receive a clock synchronization message sent by each first network side device based on a broadcast mode or a unicast mode, where the clock synchronization message exists in a referenceTimeInfo structure, and the clock quality is recorded in an uncerteainty field in the referenceTimeInfo structure.
Optionally, the instruction processing module includes: the device comprises an instruction receiving unit, a first processing unit and a second processing unit.
The instruction receiving unit is configured to receive a cell handover instruction sent by the second network side device:
the first processing unit is configured to switch a serving cell to a neighboring cell if the cell switch instruction is a data switch instruction;
and the second processing unit is used for sending the clock synchronization message sent by the first network side equipment of the adjacent cell to the next-stage equipment if the cell switching instruction is a clock switching instruction, and executing clock synchronization operation.
As can be seen from the technical solutions provided by the above embodiments of the present invention, in the embodiments of the present invention, a clock synchronization message sent by each first network side device is received, where the clock synchronization message includes clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source; recording the clock quality into a measurement report, and sending the measurement report to second network side equipment, so that the second network side equipment determines whether preset cell switching conditions are met according to the clock quality of each first network side equipment; receiving a cell switching instruction sent by the second network side equipment, and executing a cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal UE and the corresponding next-stage equipment is accurately synchronized through cell switching.
The embodiment of the invention also provides a cell switching device based on clock synchronization, fig. 7 is a schematic diagram of module composition of a first network side device for cell switching based on clock synchronization, where the cell switching device based on clock synchronization is used to execute the cell switching method based on clock synchronization described in fig. 4, and as shown in fig. 7, the cell switching device based on clock synchronization includes: clock synchronization module 701.
The clock synchronization module 701 is configured to obtain a clock quality according to a current state of clock synchronization with a clock source, record the clock quality in a clock synchronization message, and send the clock quality to a terminal, so that the terminal records the clock quality in a measurement report and sends the measurement report to a second network side device, so that the second network side device determines, according to the clock quality of each first network side device, whether a preset cell switching condition is met, and sends a cell switching instruction to the terminal.
As can be seen from the technical solutions provided in the embodiments of the present invention, clock quality is obtained according to a current state of clock synchronization with a clock source, and the clock quality is recorded in a clock synchronization message and sent to a terminal, so that the terminal records the clock quality in a measurement report and sends the measurement report to a second network side device, so that the second network side device determines, according to the clock quality of each first network side device, whether a preset cell switching condition is satisfied, and sends a cell switching instruction to the terminal. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal UE and the corresponding next-stage equipment is accurately synchronized through cell switching.
Optionally, the clock synchronization module includes: a clock source receiving unit and a clock message transmitting unit.
The clock source receiving unit is used for obtaining clock quality according to the current state of clock synchronization with the clock source and recording the clock quality in an uncerteainty field in the referenceTimeInfo structure body; the clock message sending unit is used for sending the referenceTimeInfo structure body to the terminal as a clock synchronization message based on a broadcasting mode or a unicast mode.
The technical scheme provided by the embodiment of the invention can realize that the clocks of the terminal UE and the corresponding next-stage equipment are accurately synchronized through cell switching when the first network side equipment of the service cell cannot keep synchronization with the clock source by sending the clock message synchronization message to the terminal UE in a broadcast or unicast mode.
The embodiment of the invention also provides a cell switching device based on clock synchronization, fig. 8 is a schematic diagram of module composition of a second network side device for cell switching based on clock synchronization, where the cell switching device based on clock synchronization is used to execute the cell switching method based on clock synchronization described in fig. 5, and as shown in fig. 8, the cell switching device based on clock synchronization includes: a report receiving module 801 and an instruction transmitting module 802.
The report receiving module 801 is configured to receive a measurement report sent by a terminal, where the measurement report includes clock quality of each first network side device; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source; the instruction sending module 802 is configured to determine, according to the clock quality of each first network side device, whether a preset cell switching condition is met, so as to send a cell switching instruction to the terminal, so that the terminal performs a cell switching operation.
As can be seen from the technical solutions provided by the above embodiments of the present invention, in the embodiments of the present invention, a measurement report sent by a terminal is received, where the measurement report includes clock quality of each first network side device; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source; and determining whether preset cell switching conditions are met according to the clock quality of each first network side device so as to send a cell switching instruction to the terminal, so that the terminal executes cell switching operation. By the embodiment of the invention, when the first network side equipment of the service cell cannot keep synchronization with the clock source, the clock of the terminal UE and the corresponding next-stage equipment is accurately synchronized through cell switching.
The cell switching device based on clock synchronization provided by the embodiment of the invention can realize each process in the embodiment corresponding to the cell switching method based on clock synchronization, and in order to avoid repetition, the description is omitted.
It should be noted that, the cell switching device based on clock synchronization provided by the embodiment of the present invention and the cell switching method based on clock synchronization provided by the embodiment of the present invention are based on the same inventive concept, so that the specific implementation of the embodiment may refer to the implementation of the foregoing cell switching method based on clock synchronization, and the repetition is not repeated.
The embodiment of the invention also provides an electronic device for executing the cell switching method based on clock synchronization, and fig. 9 is a schematic structural diagram of an electronic device for implementing the embodiments of the invention, as shown in fig. 9, based on the same technical concept. The electronic device may vary considerably in configuration or performance and may include one or more processors 901 and memory 902, where the memory 902 may store one or more stored applications or data. Wherein the memory 902 may be transient storage or persistent storage. The application programs stored in the memory 902 may include one or more modules (not shown), each of which may include a series of computer-executable instructions for use in an electronic device. Still further, the processor 901 may be arranged to communicate with the memory 902 and execute a series of computer executable instructions in the memory 902 on an electronic device. The electronic device may also include one or more power supplies 903, one or more wired or wireless network interfaces 904, one or more input output interfaces 905, and one or more keyboards 906.
In this embodiment, the electronic device includes a processor, a communication interface, a memory, and a communication bus; the processor, the communication interface and the memory complete communication with each other through a bus; the memory is used for storing a computer program; the processor is configured to execute the program stored in the memory, and implement the following method steps:
receiving clock synchronization messages sent by first network side equipment, wherein the clock synchronization messages comprise clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
recording the clock quality into a measurement report, and sending the measurement report to second network side equipment, so that the second network side equipment determines whether preset cell switching conditions are met according to the clock quality of each first network side equipment;
receiving a cell switching instruction sent by the second network side equipment, and executing a cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition.
Embodiments of the present application also provide a computer readable storage medium having stored therein a computer program which when executed by a processor performs the following method steps:
Receiving clock synchronization messages sent by first network side equipment, wherein the clock synchronization messages comprise clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
recording the clock quality into a measurement report, and sending the measurement report to second network side equipment, so that the second network side equipment determines whether preset cell switching conditions are met according to the clock quality of each first network side equipment;
receiving a cell switching instruction sent by the second network side equipment, and executing a cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, the electronic device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement 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 storage media for a computer 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 Discs (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. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
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 one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element.
It will be apparent to those skilled in the art that embodiments of the present application may be provided as a method, apparatus, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.
Claims (8)
1. A cell switching method based on clock synchronization, applied to a terminal, the method comprising:
receiving clock synchronization messages sent by first network side equipment, wherein the clock synchronization messages comprise clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
recording the clock quality into a measurement report, and sending the measurement report to second network side equipment, so that the second network side equipment determines whether preset cell switching conditions are met according to the clock quality of each first network side equipment;
receiving a cell switching instruction sent by the second network side equipment, and executing a cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition;
the receiving the clock synchronization message sent by each first network side device, wherein the clock synchronization message comprises clock quality and comprises:
and receiving a clock synchronization message sent by each first network side device based on a broadcasting mode or a unicast mode, wherein the clock synchronization message exists in a form of a referenceTimeInfo structure, and the clock quality is recorded in an uncerteainty field in the referenceTimeInfo structure.
2. The cell handover method according to claim 1, wherein the recording the clock quality into a measurement report and transmitting the measurement report to a second network side device includes:
if the clock quality of the first network side equipment corresponding to the serving cell is worse than that of the first network side equipment corresponding to the adjacent cell, the clock quality of each first network side equipment is recorded into a measurement report and is sent to the second network side equipment.
3. The method for cell switching based on clock synchronization according to any one of claims 1-2, wherein the receiving the cell switching instruction sent by the second network side device, performing a cell switching operation, includes:
receiving a cell switching instruction sent by the second network side equipment:
if the cell switching instruction is a data switching instruction, switching the service cell into a neighboring cell;
and if the cell switching instruction is a clock switching instruction, sending a clock synchronization message of the first network side equipment corresponding to the adjacent cell to the next-stage equipment, and executing clock synchronization operation.
4. A cell switching method based on clock synchronization, which is applied to a first network side device, the method comprising:
Obtaining clock quality according to the current state of clock synchronization with a clock source, recording the clock quality in a clock synchronization message and sending the clock quality to a terminal, so that the terminal records the clock quality in a measurement report and sends the measurement report to second network side equipment, and the second network side equipment determines whether preset cell switching conditions are met or not according to the clock quality of each first network side equipment so as to send a cell switching instruction to the terminal;
the clock quality is obtained according to the current state of clock synchronization with the clock source, and is recorded in a clock synchronization message and sent to the terminal, and the method comprises the following steps:
obtaining clock quality according to the current state of clock synchronization with a clock source, and recording the clock quality in an uncerteainty field in a referenceTimeInfo structure;
and sending the referenceTimeInfo structure body to the terminal as a clock synchronization message based on a broadcasting mode or a unicast mode.
5. A cell switching method based on clock synchronization, which is applied to a second network side device, the method comprising:
receiving a measurement report sent by a terminal, wherein the measurement report comprises clock quality of each first network side device; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
Determining whether preset cell switching conditions are met according to the clock quality of each first network side device so as to send a cell switching instruction to the terminal, so that the terminal executes cell switching operation;
the clock quality of each first network side device is obtained through a clock synchronization message sent by each first network side device based on a broadcasting mode or a unicast mode, the clock synchronization message exists in a preferencetinfo structure, and the clock quality is recorded in an uncerteainty field in the preferencetinfo structure.
6. A terminal for clock synchronization based cell handover, the terminal comprising:
the message receiving module is used for receiving clock synchronization messages sent by the first network side devices, and the clock synchronization messages comprise clock quality; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
the report sending module is used for recording the clock quality into a measurement report and sending the measurement report to second network side equipment so that the second network side equipment can determine whether preset cell switching conditions are met or not according to the clock quality of each first network side equipment;
The instruction processing module is used for receiving a cell switching instruction sent by the second network side equipment and executing cell switching operation; the cell switching instruction is sent by the second network side equipment under the condition that the clock quality meets the preset cell switching condition;
the message receiving module is specifically configured to receive a clock different message sent by a first network side device based on a broadcast mode or a unicast mode, where the clock synchronization message exists in a form of a referenceTimeInfo structure, and the clock quality is recorded in an uncerteainty field in the referenceTimeInfo structure.
7. A first network side device for clock synchronization based cell switching, the first network side device comprising:
the clock synchronization module is used for obtaining clock quality according to the current state of clock synchronization with the clock source, recording the clock quality in a clock synchronization message and sending the clock quality to the terminal, so that the terminal records the clock quality in a measurement report and sends the measurement report to second network side equipment, and the second network side equipment determines whether preset cell switching conditions are met or not according to the clock quality of each first network side equipment so as to send a cell switching instruction to the terminal;
The clock synchronization module includes: a clock source receiving unit and a clock message transmitting unit,
the clock source receiving unit is used for obtaining clock quality according to the current state of clock synchronization with the clock source and recording the clock quality in an uncerteainty field in the referenceTimeInfo structure body;
the clock message sending unit is used for sending the referenceTimeInfo structure body to the terminal as a clock synchronization message based on a broadcasting mode or a unicast mode.
8. A second network side device for clock synchronization based cell switching, the second network side device comprising:
a report receiving module, configured to receive a measurement report sent by a terminal, where the measurement report includes clock quality of each first network side device; the clock quality is obtained by each first network side device according to the current state of clock synchronization with a clock source;
the instruction sending module is used for determining whether preset cell switching conditions are met according to the clock quality of each first network side device so as to send a cell switching instruction to the terminal, so that the terminal can execute cell switching operation;
the clock quality of each first network side device is obtained through a clock synchronization message sent by each first network side device based on a broadcasting mode or a unicast mode, the clock synchronization message exists in a preferencetinfo structure, and the clock quality is recorded in an uncerteainty field in the preferencetinfo structure.
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