CN113852998A - 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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- CN113852998A CN113852998A CN202010598071.1A CN202010598071A CN113852998A CN 113852998 A CN113852998 A CN 113852998A CN 202010598071 A CN202010598071 A CN 202010598071A CN 113852998 A CN113852998 A CN 113852998A
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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 each first network side device, 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 the measurement report, and sending the clock quality to the second network side equipment so that the second network side equipment can determine whether the cell switching condition is met or not according to the clock quality; receiving a cell switching instruction sent by second network side equipment, and executing cell switching operation; and 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 can not keep synchronous with the clock source, the accurate synchronization of the terminal and the clock of the corresponding next-stage equipment is realized through cell switching.
Description
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a cell switching method based on clock synchronization, a terminal, and a network device.
Background
In the field of mobile communications, 5G is used in many vertical industries, and an application scenario is that a terminal recovers UTC time through a wireless air interface time service mode and outputs the UTC time to a user equipment, such as a Data Transfer Unit (DTU) and a Pressure Measurement Unit (PMU) in the field of power application. The 5G wireless air interface time service mode means that the 5G terminal UE recovers the accurate time information by receiving a signal sent by a base station and transmits the accurate time to equipment such as PMU/DTU and the like through time information interface protocols such as IRIG-B and the like. Meanwhile, data of the PMU/DTU can also 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 at the moment. However, in this state, the clock phase of the base station is more and more different from the standard time phase, so that the recovered clock phase of the UE below the base station is also inaccurate. The synchronization precision of some corresponding devices of the UE which provides clock output by recovering the time of the base station through 5G wireless time service is higher in some scenes, for example, the DTU requires that the synchronization precision is 1 us. When the clock state of the base station is in the hold state, although the cell service can be continuously provided, the phase deviation of the base station in the hold state becomes larger and larger as the hold duration increases. Assuming that the clock state of the base station of the serving cell where the UE is currently located is in the hold state, as the hold time increases, the clock of the base station itself has a certain deviation, and when the time reaches 1us or 2us, the clock synchronization accuracy of the device corresponding to the UE is finally affected.
In the prior art, when a base station cannot keep synchronous with a clock source, clock synchronization between a terminal UE in a serving cell and a next-stage device corresponding to the terminal UE is not accurate enough.
Disclosure of Invention
Embodiments of the present invention provide a cell switching method, a terminal, and a network device based on clock synchronization, so as to solve the problem that when a first network device cannot keep synchronization with a clock source, clock synchronization between a terminal UE in a serving cell and a next-stage device corresponding to the terminal UE in the serving cell is not accurate enough.
In order to solve the above technical problem, the embodiment of the present invention is implemented as follows:
in a first aspect, an embodiment of the present invention provides a cell switching method based on clock synchronization, which is applied to a terminal, and includes:
receiving clock synchronization messages sent by each first network side device, 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 can determine whether a preset cell switching condition is 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 cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a 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 device, and includes:
the method comprises the steps of 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 synchronization message 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 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, and includes:
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 a preset cell switching condition is met or not 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 each first network side device, 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;
a report sending module, configured to record the clock quality in 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 switching condition is met according to the clock quality of each first network side device;
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 device when the clock quality meets a preset cell switching condition.
In a fifth aspect, an embodiment of the present invention further provides a first network device for cell handover based on clock synchronization, where the first network device includes:
the clock synchronization module is used for 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 synchronization message 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 a preset cell switching condition is met 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, where the second network-side device includes:
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 a preset cell switching condition is 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.
As can be seen from the above technical solutions provided by the embodiments of the present invention, in the embodiments of the present invention, clock synchronization messages sent by each first network-side device are received, where the clock synchronization messages include 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 can determine whether a preset cell switching condition is 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 cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a preset cell switching condition. By the embodiment of the invention, when the first network side equipment of the service cell can not keep synchronous with the clock source, the accurate synchronization of the clocks of the terminal UE and the corresponding next-stage equipment is realized 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 used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first flowchart of a cell handover method based on clock synchronization according to an embodiment of the present invention;
fig. 2 is a second flowchart of a cell switching method based on clock synchronization according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of a cell switching method based on clock synchronization according to an embodiment of the present invention;
fig. 4 is a fourth flowchart illustrating a cell switching method based on clock synchronization according to an embodiment of the present invention;
fig. 5 is a schematic flowchart of a fifth method for cell handover based on clock synchronization according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a 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 illustrating a 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 illustrating a 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 those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an execution subject of the method may be a terminal UE, where the terminal UE may receive messages sent by a first network-side device of a serving cell and first network-side devices of other neighboring cells, and the terminal is connected to a next-stage device DTU and a PMU. The first network side device is a base station, and comprises a base station of a service cell where the terminal is located and base stations of adjacent cells. The method may specifically comprise the steps of:
step S01, receiving clock synchronization messages sent by each first network side device, wherein the clock synchronization messages comprise clock quality; and 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 device performs clock synchronization operation with a clock source such as a GPS or 1588, so that the first network side device maintains accurate clock, a state in which the first network side device and the clock source operate normally in clock synchronization is referred to as a locked state, and a state in which the first network side device and the clock source cannot perform clock synchronization operation is referred to as a maintained state. In the clock synchronization process, the clock information acquired by the first network side device from the clock source includes absolute time, leap second, and the like. Meanwhile, the first network side device obtains the current clock quality of the first network side device according to the current state of the clock synchronization with the clock source, including the state of being locked or kept, the duration of being kept 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 synchronization message 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 second and the like.
The terminal UE carries out clock synchronization on the terminal UE according to the clock synchronization message sent by the first network side equipment corresponding to the service cell, and then sends the clock synchronization message to the next-stage equipment for carrying out clock synchronization on the next-stage equipment, so that the clock accuracy of the terminal UE and the corresponding next-stage equipment is ensured at the same time. The specific synchronization process may be set according to actual needs, and only one of them is given as an example: the method comprises the steps that a terminal UE directly extracts clock quality in a clock synchronization message sent by a first network side device of a service cell, if the first network side device of the service cell is determined to be in a locking state according to the clock quality, absolute time is extracted from the clock synchronization message and used as local accurate time of the terminal UE, and then the local accurate time is converted into a required data protocol format according to a transmission protocol of a next-stage device and sent to the next-stage device for clock synchronization of the next-stage device.
Step S02, recording the clock quality into a measurement report, and sending the measurement report to a second network side device, so that the second network side device determines whether a preset cell switching condition is satisfied according to the clock quality of each first network side device;
step S03, receiving a cell switching instruction sent by the second network side device, and performing a cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a preset cell switching condition.
In 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, records the clock quality in the measurement report, and sends the clock quality of each first network-side device 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 a core network EPC.
And the second network side equipment judges whether the measurement report of the terminal UE meets the preset cell switching condition or not according to the preset cell switching condition. And when the preset cell switching condition is determined to be met, triggering cell switching.
The cell handover condition in the prior art mainly includes the following aspects:
1. based on the signal quality: if the serving cell signal quality is determined to be gradually weakened and the signal quality of the neighboring cell is better and better according to the measurement report, or the signal quality of the serving cell is suddenly changed, when the serving cell signal quality cannot meet the network service quality requirement of the terminal UE, cell handover needs to be performed in order to ensure the network service quality of the terminal UE.
2. Based on the distance from the terminal UE to the first network side device: and 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. Based on load balancing: if the number of the terminal UEs in the serving cell or the traffic volume and the data volume are determined to reach the limited capacity of the serving cell according to the measurement report, cell handover needs to be performed in a load balancing manner.
In the embodiment of the present invention, a cell handover condition based on clock quality is added on the basis of the cell handover condition, and a 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 and the clock quality of the serving cell is worse than a preset quality threshold according to the clock quality of the serving cell in the measurement report, 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 handover is triggered. In addition, the clock quality may be combined with the other cell switching conditions to serve as one of the determination conditions or the determination precondition.
In implementation, if the network device determines, according to the clock quality of each first network-side device in the measurement report, that a preset cell switching condition is met, the network device sends a cell switching instruction to the terminal UE.
And the terminal UE executes corresponding cell switching operation after receiving the cell switching instruction.
As can be seen from the above technical solutions provided by the embodiments of the present invention, in the embodiments of the present invention, clock synchronization messages sent by each first network-side device are received, where the clock synchronization messages include 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 can determine whether a preset cell switching condition is 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 cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a preset cell switching condition. By the embodiment of the invention, when the first network side equipment of the service cell can not keep synchronous with the clock source, the accurate synchronization of the clocks of the terminal UE and the corresponding next-stage equipment is realized through cell switching.
Based on the above embodiment, further, as shown in fig. 2, the specific processing manner of the step S02 can be varied, and an alternative processing manner is provided below, which can be specifically referred to as the processing of S021 below.
Step S021, if the clock quality of the first network side equipment corresponding to the service cell is worse than the clock quality of the first network side equipment corresponding to the adjacent cell, recording the clock quality of each first network side equipment into a measurement report, and sending the clock quality 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 each transmitted measurement report, but the terminal UE determines the clock quality of each first network side device in advance.
If the clock quality representation of the first network side device of the serving cell is in a locked state, the clock synchronization message sent by the first network side device of the serving cell may be used to perform clock synchronization on the terminal UE and the corresponding next-stage device. At this point, the clock quality need not be recorded into a measurement report.
If the first network side device of the serving cell is in the hold state, the clock quality of the first network side device of the serving cell is further compared with the clock quality of the first network side device of the neighboring cell, and if the clock quality of the first network side device of the serving cell is not worse than the clock quality of the first network side devices of all neighboring cells. At this time, since there is no switchable neighbor cell, there is no need to record the clock quality of each first network-side device in the measurement report.
If the clock quality of the first network-side device of the serving cell is worse than the clock quality of the first network-side device of any adjacent cell, the received clock quality of each first network-side device needs to be recorded in a measurement report and sent to the second network-side device to determine whether to trigger cell switching.
As can be seen from the above technical solutions provided in the embodiments of the present invention, by comparing the clock quality of the first network-side device in the serving cell with the clock quality of the first network-side device in the neighboring cell, if the clock quality is worse, the clock quality of each first network-side device is recorded in the measurement report. By the embodiment of the invention, when the first network side equipment of the service cell can not keep synchronous with the clock source, the accurate synchronization of the clocks of the terminal UE and the corresponding next-stage equipment is realized through cell switching, and the data transmission quantity between the terminal UE and the second network side equipment is relatively reduced.
Based on the above embodiments, further, the specific processing manner of step S01 may be varied, and an alternative processing manner is provided below, which may be specifically referred to as the processing of S011 below.
Step S011, receiving a clock synchronization message sent by each first network device based on a broadcast mode or a unicast mode, where the clock synchronization message exists in a referrenetimeinfo structure form, and the clock quality is recorded in an uncertaintity field in the referrenetimeinfo 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 in a broadcast-based manner or a unicast-based 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 into a system information block SIB message, such as SIB9 message, based on the broadcast approach. By adding a referretimeinfo structure to the SIB message, the clock synchronization message is represented in the form of the referretimeinfo structure, as follows:
based on a unicast mode, the clock synchronization message is recorded into a downlink message, and a referrentietidinfo structure is also added to the downlink message as follows:
according to the information contained in the clock synchronization message, the referrenetimeinfo structure may contain a plurality of fields, as follows:
the uncertainties field describes clock quality, and the inaccuracy degree of the clock of the first network side device is described by referring to time information, and each unit is 25 ns. The first network side device may fill in this field according to the current synchronization state, if the first network side device is in the locked state, the uncertaintiy field is 0, and if the first network side device is in the hold state, fill in a corresponding value according to the duration of the hold state.
As can be seen from the above technical solutions provided by the embodiments of the present invention, in the embodiments of the present invention, the clock message synchronization message is sent to the terminal UE in a broadcast or unicast manner, so that when the first network side device of the serving cell cannot keep synchronization with the clock source, the clocks of the terminal UE and the corresponding next-stage device are accurately synchronized through cell switching.
Based on the above embodiment, 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 specifically refer to the following steps S031-S033.
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 serving cell to the adjacent cell;
step 033, if the cell switching instruction is a clock switching instruction, sending the clock synchronization message sent by the first network side device of the adjacent cell to the next level device, and performing clock synchronization operation.
As can be seen from the foregoing embodiment, when the second network-side device determines, according to the clock quality of each first network-side device in the measurement report, that a preset cell switching condition is met, a cell switching instruction is sent to the terminal UE, so that the terminal UE performs a cell switching operation, and a serving cell of the terminal UE is switched to an adjacent cell.
In implementation, in order to ensure that the terminal UE can maintain the rate and reliability of data transmission when achieving accurate clock synchronization. The second network side device may further divide the cell switching condition based on the clock quality into two types, one type is to switch the serving cell, and the other type is not to switch the serving cell, and the cell switching instructions corresponding to the two cell switching conditions are a data switching instruction and a clock switching instruction, respectively.
And if the cell switching instruction received by the terminal UE is a data switching instruction, switching the serving cell of the terminal UE to an adjacent cell, and performing data transmission and clock synchronization of the terminal UE through first network side equipment of the adjacent cell.
And 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, the data transmission of the terminal UE is still performed through the first network side device of the serving cell, and the clock synchronization is performed by the first network side device of the adjacent cell. Equivalently, the clock synchronization between the terminal UE and the next device is achieved by using the clock synchronization message received from the neighboring cell.
As can be seen from the above technical solutions provided by the embodiments of the present invention, the embodiments of the present invention divide the cell switching instruction into the data switching instruction and the clock switching instruction, so that when the first network-side device of the serving cell cannot keep synchronization with the clock source, the data transmission efficiency of the terminal UE is ensured on the basis of accurate clock synchronization between the terminal UE and the next-stage device corresponding to the terminal UE through cell switching.
As shown in fig. 4, the embodiment of the present invention further provides a cell handover method based on clock synchronization, where an execution subject of the method may be a first network-side device. The method may specifically comprise the steps of:
step S11, obtaining clock quality according to a current state of clock synchronization with a clock source, recording the clock quality in a clock synchronization message, and sending the clock synchronization message 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 whether a preset cell switching condition is met according to the clock quality of each first network side device, and sends a cell switching instruction to the terminal.
The first network side equipment keeps the clock accuracy by performing clock synchronization operation with a clock source such as a GPS or 1588. And in the clock synchronization process, the first network side equipment acquires clock information from the 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 and the clock source perform clock synchronization. And then, the first network side equipment records the clock quality into a clock synchronization message according to the requirement and sends the clock synchronization message to the terminal UE. Besides the clock quality, the clock synchronization message can also record the clock information acquired from the 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 serving cell, and then sends the clock synchronization message to the next-stage equipment for performing clock synchronization on the next-stage equipment, so as to ensure that the clocks of the terminal UE and the corresponding next-stage equipment are accurate.
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, records the clock quality in the measurement report, and sends the clock quality of each first network side device 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 or not according to the preset cell switching condition. And when the preset cell switching condition is determined to be met, triggering cell switching.
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 and the clock quality of the serving cell is worse than a preset quality threshold according to the clock quality of the serving cell in the measurement report, 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 cell switching is triggered. In addition, the clock quality can be combined with other cell switching conditions to serve as one judgment condition or judgment premise.
In implementation, if the network device determines, according to the clock quality of each first network-side device in the measurement report, that a preset cell switching condition is met, the network device sends a cell switching instruction to the terminal UE.
And the terminal UE executes corresponding cell switching operation after receiving the cell switching instruction.
As can be seen from the above technical solutions provided in the embodiments of the present invention, the clock quality is obtained according to the current state of clock synchronization with the clock source, and is recorded in the clock synchronization message and sent to the terminal, so that the terminal records the clock quality in the measurement report and sends the measurement report to the second network side device, so that the second network side device determines whether the preset cell switching condition is met according to the clock quality of each first network side device, and sends the cell switching instruction to the terminal. By the embodiment of the invention, when the first network side equipment of the service cell can not keep synchronous with the clock source, the accurate synchronization of the clocks of the terminal UE and the corresponding next-stage equipment is realized through cell switching.
Based on the foregoing embodiment, further, the obtaining the clock quality according to the current state of clock synchronization with the clock source, and recording the clock quality in the clock synchronization message and sending the clock synchronization message to the terminal includes:
obtaining the clock quality according to the current state of clock synchronization with the clock source, and recording the clock quality into an uncertaintity field in a referrenceTimeInfo structure;
and sending the referreneTimeInfo structure as a clock synchronization message to a terminal based on a broadcast 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 in a broadcast-based manner or a unicast-based 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 into a system information block SIB message, such as SIB9 message, based on the broadcast approach. And adding a referenceTimeInfo structure body in the SIB message, and representing the clock synchronization message in the form of the referenceTimeInfo structure body.
Based on a unicast mode, the clock synchronization message is recorded into a downlink message, and a referrentietidinfo structure is also added to the downlink message.
According to the information contained in the clock synchronization message, the referretimifo structure may contain a plurality of fields, where an uncertaintiy field describes clock quality, and the inaccuracy of the clock of the first network side device is described with reference to time information, and each unit is 25 ns. The first network side device may fill in this field according to the current synchronization state, if the first network side device is in the locked state, the uncertaintiy field is 0, and if the first network side device is in the hold state, fill in a corresponding value according to the duration of the hold state.
As can be seen from the above technical solutions provided by the embodiments of the present invention, in the embodiments of the present invention, the clock message synchronization message is sent to the terminal UE in a broadcast or unicast manner, so that when the first network side device of the serving cell cannot keep synchronization with the clock source, the clocks of the terminal UE and the corresponding next-stage device are accurately synchronized through cell switching.
As shown in fig. 5, the embodiment of the present invention further provides a cell handover method based on clock synchronization, where an execution subject of the method may be a second network-side device. The method may specifically comprise the steps of:
step S21, receiving a measurement report sent by the terminal, wherein the measurement report comprises the 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, determining whether a preset cell switching condition is satisfied 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 performs a cell switching operation.
The first network side equipment keeps the clock accuracy by performing clock synchronization operation with a clock source such as a GPS or 1588. And in the clock synchronization process, the first network side equipment acquires clock information from the 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 and the clock source perform clock synchronization. And then, the first network side equipment records the clock quality into a clock synchronization message according to the requirement and sends the clock synchronization message to the terminal UE. Besides the clock quality, the clock synchronization message can also record the clock information acquired from the 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 serving cell, and then sends the clock synchronization message to the next-stage equipment for performing clock synchronization on the next-stage equipment, so as to ensure that the clocks of the terminal UE and the corresponding next-stage equipment are accurate.
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, records the clock quality in the measurement report, and sends the clock quality of each first network side device 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 or not according to the preset cell switching condition. And when the preset cell switching condition is determined to be met, triggering cell switching.
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 and the clock quality of the serving cell is worse than a preset quality threshold according to the clock quality of the serving cell in the measurement report, 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 cell switching is triggered. In addition, the clock quality can be combined with other cell switching conditions to serve as one judgment condition or judgment premise.
In implementation, if the network device determines, according to the clock quality of each first network-side device in the measurement report, that a preset cell switching condition is met, the network device sends a cell switching instruction to the terminal UE.
And the terminal UE executes corresponding cell switching operation after receiving the cell switching instruction.
As can be seen from the above technical solutions provided by the embodiments of the present invention, the embodiments of the present invention 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 determining whether a preset cell switching condition is met or not 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 can not keep synchronous with the clock source, the accurate synchronization of the clocks of the terminal UE and the corresponding next-stage equipment is realized through cell switching.
Corresponding to the cell switching method based on clock synchronization provided in the foregoing embodiments, based on the same technical concept, an embodiment of the present invention further provides a cell switching apparatus based on clock synchronization, fig. 6 is a schematic diagram of a module composition of a terminal for cell switching based on clock synchronization provided in an embodiment of the present invention, where the cell switching apparatus based on clock synchronization is configured to execute the cell switching method based on clock synchronization described in fig. 1 to fig. 3, and as shown in fig. 6, the cell switching apparatus based on clock synchronization includes: a message receiving module 601, a report sending 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 in 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 switching condition is met according to the clock quality of each first network side device; an instruction processing module 603, configured to receive a cell switching instruction sent by the second network-side device, and execute a cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a preset cell switching condition.
As can be seen from the above technical solutions provided by the embodiments of the present invention, in the embodiments of the present invention, clock synchronization messages sent by each first network-side device are received, where the clock synchronization messages include 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 can determine whether a preset cell switching condition is 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 cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a preset cell switching condition. By the embodiment of the invention, when the first network side equipment of the service cell can not keep synchronous with the clock source, the accurate synchronization of the clocks of the terminal UE and the corresponding next-stage equipment is realized through cell switching.
Optionally, the report sending module is specifically configured to, 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, record the clock quality of each first network-side device in the measurement report, and send the measurement report to the second network-side device.
Optionally, the message receiving module is specifically configured to receive a clock synchronization message sent by each first network device based on a broadcast manner or a unicast manner, where the clock synchronization message exists in a referrenetimeinfo structure, and the clock quality is recorded in an uncertaintiy field in the referrenetimeinfo 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 an adjacent cell if the cell switching instruction is a data switching instruction;
and the second processing unit is configured to send the clock synchronization message sent by the first network-side device of the adjacent cell to the next-stage device and perform clock synchronization operation if the cell switching instruction is a clock switching instruction.
As can be seen from the above technical solutions provided by the embodiments of the present invention, in the embodiments of the present invention, clock synchronization messages sent by each first network-side device are received, where the clock synchronization messages include 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 can determine whether a preset cell switching condition is 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 cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a preset cell switching condition. By the embodiment of the invention, when the first network side equipment of the service cell can not keep synchronous with the clock source, the accurate synchronization of the clocks of the terminal UE and the corresponding next-stage equipment is realized through cell switching.
Fig. 7 is a schematic diagram of a module composition of a first network-side device for cell handover based on clock synchronization according to an embodiment of the present invention, where the cell handover device based on clock synchronization is configured to execute the cell handover method based on clock synchronization described in fig. 4, and as shown in fig. 7, the cell handover device based on clock synchronization includes: a 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 synchronization message 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 whether a preset cell switching condition is met according to the clock quality of each first network side device, and sends a cell switching instruction to the terminal.
As can be seen from the above technical solutions provided in the embodiments of the present invention, the clock quality is obtained according to the current state of clock synchronization with the clock source, and is recorded in the clock synchronization message and sent to the terminal, so that the terminal records the clock quality in the measurement report and sends the measurement report to the second network side device, so that the second network side device determines whether the preset cell switching condition is met according to the clock quality of each first network side device, and sends the cell switching instruction to the terminal. By the embodiment of the invention, when the first network side equipment of the service cell can not keep synchronous with the clock source, the accurate synchronization of the clocks of the terminal UE and the corresponding next-stage equipment is realized through cell switching.
Optionally, the clock synchronization module includes: the clock source receiving unit and the clock message sending unit.
The clock source receiving unit is used for obtaining clock quality according to the current state of clock synchronization with a clock source and recording the clock quality into an uncertaintiy field in a referrence TimeInfo structure; and the clock message sending unit is used for sending the referrenetimelnfo structure body to a terminal as a clock synchronization message based on a broadcast mode or a unicast mode.
As can be seen from the above technical solutions provided by the embodiments of the present invention, in the embodiments of the present invention, the clock message synchronization message is sent to the terminal UE in a broadcast or unicast manner, so that when the first network side device of the serving cell cannot keep synchronization with the clock source, the clocks of the terminal UE and the corresponding next-stage device are accurately synchronized through cell switching.
Fig. 8 is a schematic diagram of a module composition of a second network-side device for cell handover based on clock synchronization according to an embodiment of the present invention, where the cell handover device based on clock synchronization is configured to execute the cell handover method based on clock synchronization described in fig. 5, and as shown in fig. 8, the cell handover device based on clock synchronization includes: a report receiving module 801 and an instruction sending 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 whether a preset cell switching condition is 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 performs a cell switching operation.
As can be seen from the above technical solutions provided by the embodiments of the present invention, the embodiments of the present invention 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 determining whether a preset cell switching condition is met or not 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 can not keep synchronous with the clock source, the accurate synchronization of the clocks of the terminal UE and the corresponding next-stage equipment is realized through cell switching.
The cell switching device based on clock synchronization provided by the embodiment of the present invention can implement each process in the embodiment corresponding to the cell switching method based on clock synchronization, and is not described herein again to avoid repetition.
It should be noted that the cell switching device based on clock synchronization provided in the embodiment of the present invention and the cell switching method based on clock synchronization provided in the embodiment of the present invention are based on the same inventive concept, and therefore, for specific implementation of the embodiment, reference may be made to implementation of the cell switching method based on clock synchronization, and repeated details are not described again.
Corresponding to the cell switching method based on clock synchronization provided in the foregoing embodiment, based on the same technical concept, an embodiment of the present invention further provides an electronic device, where the electronic device is configured to execute the cell switching method based on clock synchronization, and fig. 9 is a schematic structural diagram of an electronic device implementing various embodiments of the present invention, as shown in fig. 9. Electronic devices may vary widely 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. Memory 902 may be, among other things, transient storage or persistent storage. The application program stored in memory 902 may include one or more modules (not shown), each of which may include a series of computer-executable instructions for the electronic device. Still further, the processor 901 may be configured to communicate with the memory 902 to execute a series of computer-executable instructions in the memory 902 on the 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, one or more keyboards 906.
Specifically, 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 mutual communication through a bus; the memory is used for storing a computer program; the processor is used for executing the program stored in the memory and realizing the following method steps:
receiving clock synchronization messages sent by each first network side device, 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 can determine whether a preset cell switching condition is 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 cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a preset cell switching condition.
An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored, and when executed by a processor, the computer program implements the following method steps:
receiving clock synchronization messages sent by each first network side device, 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 can determine whether a preset cell switching condition is 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 cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a preset cell switching condition.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 a typical configuration, an electronic device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.
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 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 Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that 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 like elements in a process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, 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 above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. A cell switching method based on clock synchronization is applied to a terminal, and the method comprises the following steps:
receiving clock synchronization messages sent by each first network side device, 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 can determine whether a preset cell switching condition is 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 cell switching operation; the cell switching instruction is sent by the second network side device when the clock quality meets a preset cell switching condition.
2. The method for cell switching based on clock synchronization of claim 1, wherein the recording the clock quality into a measurement report and sending the measurement report to a second network side device comprises:
and 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, recording the clock quality of each first network side equipment into the measurement report, and sending the clock quality to the second network side equipment.
3. The method according to claim 2, wherein the receiving the clock synchronization message sent by each first network-side device, the clock synchronization message including a clock quality comprises:
receiving a clock synchronization message sent by each first network side device based on a broadcast mode or a unicast mode, wherein the clock synchronization message exists in a referrentietimeinfo structural body form, and the clock quality is recorded in an uncertaintity field in the referrentietimeinfo structural body.
4. The method for cell handover based on clock synchronization according to any one of claims 1 to 3, wherein the receiving the cell handover command sent by the second network-side device, and performing the cell handover 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 a service cell into an adjacent cell;
and if the cell switching instruction is a clock switching instruction, sending the clock synchronization message of the first network side equipment corresponding to the adjacent cell to the next level equipment, and executing clock synchronization operation.
5. A cell switching method based on clock synchronization is applied to a first network side device, and the method comprises the following steps:
the method comprises the steps of 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 synchronization message 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 according to the clock quality of each first network side equipment, so as to send a cell switching instruction to the terminal.
6. The method of claim 5, wherein the obtaining the clock quality according to the current state of the clock synchronization with the clock source, and recording the clock quality in a clock synchronization message to be sent to the terminal comprises:
obtaining the clock quality according to the current state of clock synchronization with the clock source, and recording the clock quality into an uncertaintity field in a referrenceTimeInfo structure;
and sending the referreneTimeInfo structure as a clock synchronization message to a terminal based on a broadcast mode or a unicast mode.
7. A cell switching method based on clock synchronization is applied to a second network side device, and the method comprises the following steps:
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 a preset cell switching condition is met or not 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.
8. A terminal for cell handover based on clock synchronization, the terminal comprising:
the message receiving module is used for receiving clock synchronization messages sent by each first network side device, 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;
a report sending module, configured to record the clock quality in 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 switching condition is met according to the clock quality of each first network side device;
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 device when the clock quality meets a preset cell switching condition.
9. A first network side device for cell handover based on clock synchronization, 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 a clock source, recording the clock quality in a clock synchronization message and sending the clock synchronization message 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 a preset cell switching condition is met according to the clock quality of each first network side equipment so as to send a cell switching instruction to the terminal.
10. A second network side device for cell handover based on clock synchronization, 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;
and the instruction sending module is used for determining whether a preset cell switching condition is 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.
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