CN108377543A - NBIoT terminal clocks synchronous method and device - Google Patents
NBIoT terminal clocks synchronous method and device Download PDFInfo
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- CN108377543A CN108377543A CN201810018248.9A CN201810018248A CN108377543A CN 108377543 A CN108377543 A CN 108377543A CN 201810018248 A CN201810018248 A CN 201810018248A CN 108377543 A CN108377543 A CN 108377543A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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Abstract
The present invention provides a kind of NBIoT terminal clocks synchronous method and devices.Wherein, a kind of NBIoT terminal clocks synchronous method, including：Detect the NPSS signals and NSSS signals in down channel；According to NPSS signals and NSSS signals, the clock frequency f of NBIoT terminal inners is parsedUEAnd the clock frequency f in downlink signal CF signalDL, and calculate fUEWith fDLDifference DELTA f；Signal in all down channels received to NBIoT terminals carries out resampling, and the difference between the frequency and current downlink signal carrier frequency of resampling is Δ f, then the downlink signal carrier frequency after resampling is switched in the clock frequency of NBIoT terminal inners；Detect the data-signal in up channel, after the data-signal in up channel generates, resampling is carried out to data-signal, difference between the frequency of resampling and the clock frequency fUE of NBIoT terminal inners is Δ f, then the uplink signal carrier frequency after resampling is switched in the clock frequency in downlink signal CF signal.
Description
Technical field
The present invention relates to Internet of Things mobile communication technology fields, in particular to a kind of NBIoT terminal clocks side of synchronization
Method, a kind of NBIoT terminal clocks synchronizing device.
Background technology
NBIoT (Narrow Band Internet of Things, NB-IoT) is the Internet of Things channel radio that 3GPP is formulated
News standard.NBIoT terminals and base station are by being wirelessly attached, upload and downloading data.It is wirelessly communicated by then passing through,
For guarantee communication quality, the clock reference needs of terminal and base station are consistent, and base station side generally uses GPS clock benchmark, essence
It spends very high.End side can only use the lower crystal clock of precision, this precision that cannot expire due to being limited to volume and cost
Sufficient NBIoT eat dishes without rice or wine communication requirement.
Traditional solution is that the crystal clock of end side uses VCTCXO, this clock crystal to have additional temperature to mend
It repays, so temperature stability is good, precision can reach 0.5-2.5ppm, while being finally can be synchronous with base station standard time clock,
The crystal clock also supports voltage-controlled compensation, is exactly the input by external voltage, finely tunes the precision of clock, to be finally reached and base
The purpose that clock of standing synchronizes.The benefit of this design is that terminal chip realizes simple, and precision is high, reliable and stable.However, tradition makes
Also clearly with the scheme disadvantage of VCTCXO, VCTCXO is expensive, using in IoT applications, due to total system at
This is very low, and the price of VCTCXO just becomes cost disadvantage in this solution.
Invention content
The present invention is directed to solve at least one of the technical problems existing in the prior art or related technologies.
For this purpose, it is an aspect of the invention to propose a kind of NBIoT terminal clocks synchronous method.
Another aspect of the present invention is to propose a kind of NBIoT terminal clocks synchronizing device.
In view of this, the present invention proposes a kind of NBIoT terminal clocks synchronous method, NBIoT terminals and base station pass through nothing
Line is attached, and includes using crystal oscillator, clock synchronizing method outside NBIoT terminal chips：Detect the main synchronous letter in down channel
Number NPSS (Narrowband Primary Synchronization Signal) signals and secondary synchronization signal NSSS
(Narrowband Secondary Synchronization Signal) signal；According to NPSS signals and NSSS signals, parsing
Go out the clock frequency f of NBIoT terminal innersUEAnd the clock frequency f in downlink signal CF signalDL, and calculate fUEWith fDL's
Difference DELTA f；Signal in all down channels received to NBIoT terminals carries out resampling, wherein is connect to NBIoT terminals
It is Δ f that signal in all down channels received, which carries out the difference between the frequency and current downlink signal carrier frequency of resampling,
Then the downlink signal carrier frequency after resampling is switched in the clock frequency of NBIoT terminal inners；Detect the data in up channel
Signal carries out resampling after the data-signal in up channel generates to data-signal, wherein carries out weight to data-signal
The frequency of sampling and the clock frequency f of NBIoT terminal innersUEBetween difference be-Δ f, then uplink signal after resampling carries
Frequency is switched in the clock frequency in downlink signal CF signal.
NBIoT terminal clocks synchronous method according to the present invention, NBIoT terminal chips use general crystal oscillator outside, in NBIOT
In terminal chip, first by detecting NPSS the and NSSS signals in down channel, present terminal internal clock frequencies are parsed
fUEWith the clock frequency f in downlink signal CF signalDLDifference Δ f.Then by the hardware circuit in chip by all downlinks
The signal that channel receives carries out resampling, and the difference on the frequency between the frequency and signal carrier frequency of resampling is Δ f.In this way, adopt again
Signal carrier frequency after sample has just had been switched in NBIoT terminal inner clock frequencies.For up channel, also due to terminal
Chip interior Clock Frequency Accuracy is very low, needs to handle up channel.The data-signal of portion's up channel in the chip
After generation, resampling is carried out to data-signal, the frequency of resampling and the difference on the frequency of chip interior clock frequency are-Δ f.This
Sample, the signal carrier frequency after resampling have been switched to the clock frequency in base station clock frequency i.e. downlink signal CF signal
fDL.Clock synchronizing method provided by the invention can make NBIoT terminal systems only use cheap general crystal oscillator, without
Clock source is done using expensive VCTCXO, system cost is greatly reduced；Reached in the chip by hardware algorithm realization real-time
Clock synchronizes, and carries out signal synchronization by clock synchronization module in the chip, is greatly reduced and is wanted to exterior of terminal clock accuracy
It asks, greatly simplifies system complexity, power consumption and cost is greatly reduced.
In the above-mentioned technical solutions, it is preferable that the signal in all down channels received to NBIoT terminals carries out
After resampling, further include：Operation is decoded to the signal on down channel, parses the data carried on down channel.
In the technical scheme, in NBIoT terminal systems, downlink detects internal clocking and receives the clock of data
Difference on the frequency can be carried out by internal algorithm by downlink data resampling to internal clock frequencies with using terminal internal clocking
Subsequent decoding operation, solves the data carried on down channel, disclosure satisfy that Internet of Things network mobile communication business transferring information institute
The transmission needed and switching performance demand.
In any of the above-described technical solution, it is preferable that after carrying out resampling to data-signal, further include：It will adopt again
The data in up channel after sample are transmitted to base station.
In the technical scheme, in NBIoT terminal systems, the difference on the frequency of uplink application downlink detection passes through
Upstream data resampling on internal clock frequencies to uplink output frequency, then is eated dishes without rice or wine to send out by internal algorithm by up channel
It penetrates to base station, when realizing that NBIoT terminals carry out data transmission with base station, sends and receives both sides and keep complete synchronous.
In any of the above-described technical solution, it is preferable that the precision of the crystal oscillator includes following at least any one：10ppm、
15ppm、20ppm。
In the technical scheme, general external crystal oscillator grade generally comprises 10ppm, 15ppm, 20ppm, but not limited to this.
The present invention uses crystal oscillator outside NBIoT terminal chips, and the selection of accuracy class includes any of the above item, but not limited to this,
In specific implementation, depending on the requirement of communication that can eat dishes without rice or wine according to production cost demand and NBIoT.
In any of the above-described technical solution, it is preferable that the precision of crystal oscillator is 10ppm.
In the technical scheme, general crystal oscillator, precision 10ppm, the crystal oscillator of this precision are used outside NBIoT terminal chips
Price is very low, therefore can effectively reduce cost, however its precision cannot meet NBIoT terminal called demands, be easy to cause communication
Effect difference can not even communicate.The present invention by hardware algorithm realization to reach real-time clock using being synchronized in the chip, in core
Signal synchronization is carried out by clock synchronization module in piece, the requirement to exterior of terminal clock accuracy is greatly reduced, greatly simplifies and is
It unites complexity, reduces cost, and have the characteristics that small, be more in line with the demand of NBIoT terminals.
The invention also provides a kind of NBIoT terminal clocks synchronizing device, NBIoT terminals and base station are by wirelessly being connected
It connects, includes using crystal oscillator, clock synchronization apparatus outside NBIoT terminal chips：Detection unit, for detecting the NPSS in down channel
Signal and NSSS signals；Computing unit, for according to NPSS signals and NSSS signals, parsing the clock of NBIoT terminal inners
Frequency fUEAnd the clock frequency f in downlink signal CF signalDL, and calculate fUEWith fDLDifference DELTA f；First synchronization unit,
Signal in all down channels for being received to NBIoT terminals carries out resampling, wherein is received to NBIoT terminals
All down channels in signal carry out resampling frequency and current downlink signal carrier frequency between difference be Δ f, then weigh
Downlink signal carrier frequency after sampling is switched in the clock frequency of NBIoT terminal inners；Second synchronization unit, for detecting uplink
Data-signal in channel carries out resampling, to data-signal after the data-signal in up channel generates to data-signal
Carry out the clock frequency f of the frequency and NBIoT terminal inners of resamplingUEBetween difference be-Δ f, the then signal after resampling
Carrier frequency is switched to the clock frequency in downlink signal CF signal.
NBIoT terminal clocks synchronizing device according to the present invention, NBIoT terminal chips use general crystal oscillator outside, in NBIOT
In terminal chip, first by detecting NPSS the and NSSS signals in down channel, present terminal internal clock frequencies are parsed
fUEWith the clock frequency f in downlink signal CF signalDLDifference Δ f.Then by the hardware circuit in chip by all downlinks
The signal that channel receives carries out resampling, and the difference on the frequency between the frequency and signal carrier frequency of resampling is Δ f.In this way, adopt again
Signal carrier frequency after sample has just had been switched in NBIoT terminal inner clock frequencies.For up channel, also due to terminal
Chip interior Clock Frequency Accuracy is very low, needs to handle up channel.The data-signal of portion's up channel in the chip
After generation, resampling is carried out to data-signal, the frequency of resampling and the difference on the frequency of chip interior clock frequency are-Δ f.This
Sample, the signal carrier frequency after resampling have been switched to the clock frequency in base station clock frequency i.e. downlink signal CF signal
fDL.Clock synchronizing method provided by the invention can make NBIoT terminal systems only use cheap general crystal oscillator, without
Clock source is done using expensive VCTCXO, system cost is greatly reduced；Reached in the chip by hardware algorithm realization real-time
Clock synchronizes, and carries out signal synchronization by clock synchronization module in the chip, is greatly reduced and is wanted to exterior of terminal clock accuracy
It asks, greatly simplifies system complexity, power consumption and cost is greatly reduced.
In the above-mentioned technical solutions, it is preferable that the signal in all down channels received to NBIoT terminals carries out
After resampling, further include：Decoding unit parses down channel for being decoded operation to the signal on down channel
The data of upper carrying.
In the technical scheme, in NBIoT terminal systems, downlink detects internal clocking and receives the clock of data
Difference on the frequency can be carried out by internal algorithm by downlink data resampling to internal clock frequencies with using terminal internal clocking
Subsequent decoding operation, solves the data carried on down channel, disclosure satisfy that Internet of Things network mobile communication business transferring information institute
The transmission needed and switching performance demand.
In any of the above-described technical solution, it is preferable that after carrying out resampling to data-signal, further include：Transmitting is single
Member, for the data in the up channel after resampling to be transmitted to base station.
In the technical scheme, in NBIoT terminal systems, the difference on the frequency of uplink application downlink detection passes through
Upstream data resampling on internal clock frequencies to uplink output frequency, then is eated dishes without rice or wine to send out by internal algorithm by up channel
It penetrates to base station, when realizing that NBIoT terminals carry out data transmission with base station, sends and receives both sides and keep complete synchronous.
In any of the above-described technical solution, it is preferable that the precision of the crystal oscillator includes following at least any one：10ppm、
15ppm、20ppm。
In the technical scheme, general external crystal oscillator grade generally comprises 10ppm, 15ppm, 20ppm, but not limited to this.
The present invention uses crystal oscillator outside NBIoT terminal chips, and the selection of accuracy class includes any of the above item, but not limited to this,
In specific implementation, depending on the requirement of communication that can eat dishes without rice or wine according to production cost demand and NBIoT.
In any of the above-described technical solution, it is preferable that the precision of crystal oscillator is 10ppm.
In the technical scheme, general crystal oscillator, precision 10ppm, the crystal oscillator of this precision are used outside NBIoT terminal chips
Price is very low, therefore can effectively reduce cost, however its precision cannot meet NBIoT terminal called demands, be easy to cause communication
Effect difference can not even communicate.The present invention by hardware algorithm realization to reach real-time clock using being synchronized in the chip, in core
Signal synchronization is carried out by clock synchronization module in piece, the requirement to exterior of terminal clock accuracy is greatly reduced, greatly simplifies and is
It unites complexity, reduces cost, and have the characteristics that small, be more in line with the demand of NBIoT terminals.
The additional aspect and advantage of the present invention will become apparent in following description section, or practice through the invention
Recognize.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1 shows the flow diagram of NBIoT terminal clocks synchronous method according to an embodiment of the invention；
Fig. 2 shows the flow diagrams of NBIoT terminal clock synchronous method according to another embodiment of the invention；
Fig. 3 shows the schematic block diagram of NBIoT terminal clocks synchronizing device according to an embodiment of the invention；
Fig. 4 shows the schematic block diagram of NBIoT terminal clock synchronizing devices according to another embodiment of the invention；
Fig. 5 shows the schematic block diagram of NBIoT terminal clock synchronizing devices according to still a further embodiment.
Specific implementation mode
To better understand the objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and specific real
Mode is applied the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still, the present invention may be used also
To be implemented different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
As shown in Figure 1, the flow diagram of NBIoT terminal clocks synchronous method according to an embodiment of the invention.
Wherein, NBIoT terminals and base station use crystal oscillator, the clock synchronizing method packet by being wirelessly attached outside NBIoT terminal chips
It includes：
Step 102, the NPSS signals and NSSS signals in down channel are detected；
Step 104, according to NPSS signals and NSSS signals, the clock frequency f of NBIoT terminal inners is parsedUEUnder and
Clock frequency f in row signal CF signalDL, and calculate fUEWith fDLDifference DELTA f；
Step 106, the signal in all down channels received to NBIoT terminals carries out resampling, wherein right
Signal in all down channels that NBIoT terminals receive carries out between the frequency and current downlink signal carrier frequency of resampling
Difference is Δ f, then the downlink signal carrier frequency after resampling is switched in the clock frequency of NBIoT terminal inners；
Step 108, the data-signal in up channel is detected, after the data-signal in up channel generates, to data
Signal carries out resampling, wherein the clock frequency f of the frequency and NBIoT terminal inners of resampling is carried out to data-signalUEBetween
Difference be-Δ f, then the uplink signal carrier frequency after resampling be switched in the clock frequency in downlink signal CF signal.
NBIoT terminal clocks synchronous method provided by the invention, NBIoT terminal chips use general crystal oscillator outside, in NBIOT
In terminal chip, first by detecting NPSS the and NSSS signals in down channel, present terminal internal clock frequencies are parsed
fUEWith the clock frequency f in downlink signal CF signalDLDifference Δ f.Then by the hardware circuit in chip by all downlinks
The signal that channel receives carries out resampling, and the difference on the frequency between the frequency and signal carrier frequency of resampling is Δ f.In this way, adopt again
Signal carrier frequency after sample has just had been switched in NBIoT terminal inner clock frequencies.For up channel, also due to terminal
Chip interior Clock Frequency Accuracy is very low, needs to handle up channel.The data-signal of portion's up channel in the chip
After generation, resampling is carried out to data-signal, the frequency of resampling and the difference on the frequency of chip interior clock frequency are-Δ f.This
Sample, the signal carrier frequency after resampling have been switched to the clock frequency in base station clock frequency i.e. downlink signal CF signal
fDL.Clock synchronizing method provided by the invention can make NBIoT terminal systems only use cheap general crystal oscillator, without
Clock source is done using expensive VCTCXO, system cost is greatly reduced；Reached in the chip by hardware algorithm realization real-time
Clock synchronizes, and carries out signal synchronization by clock synchronization module in the chip, is greatly reduced and is wanted to exterior of terminal clock accuracy
It asks, greatly simplifies system complexity, power consumption and cost is greatly reduced.
As shown in Fig. 2, the flow signal of NBIoT terminal clock synchronous method according to another embodiment of the invention
Figure.Wherein, NBIoT terminals and base station use crystal oscillator, the clock side of synchronization by being wirelessly attached outside NBIoT terminal chips
Method includes：
Step 202, the NPSS signals and NSSS signals in down channel are detected；
Step 204, according to NPSS signals and NSSS signals, the clock frequency f of NBIoT terminal inners is parsedUEUnder and
Clock frequency f in row signal CF signalDL, and calculate fUEWith fDLDifference DELTA f；
Step 206, the signal in all down channels received to NBIoT terminals carries out resampling, wherein right
Signal in all down channels that NBIoT terminals receive carries out between the frequency and current downlink signal carrier frequency of resampling
Difference is Δ f, then the downlink signal carrier frequency after resampling is switched in the clock frequency of NBIoT terminal inners, to down channel
On signal be decoded operation, parse the data carried on down channel；
Step 208, the data-signal in up channel is detected, after the data-signal in up channel generates, to data
Signal carries out resampling, wherein the clock frequency f of the frequency and NBIoT terminal inners of resampling is carried out to data-signalUEBetween
Difference be-Δ f, then the uplink signal carrier frequency after resampling be switched in the clock frequency in downlink signal CF signal, will
The data in up channel after resampling are transmitted to base station.
In this embodiment, in NBIoT terminal systems, the frequency of downlink detection internal clocking and the clock for receiving data
Rate is poor, by internal algorithm by downlink data resampling to internal clock frequencies, after being carried out with using terminal internal clocking
Continuous decoding operation, solves the data carried on down channel, disclosure satisfy that needed for Internet of Things network mobile communication business transferring information
Transmission and switching performance demand.
In this embodiment, in NBIoT terminal systems, the difference on the frequency of uplink application downlink detection, by interior
Upstream data resampling on internal clock frequencies to uplink output frequency, then is eated dishes without rice or wine to emit by algorithms by up channel
To base station, when realizing that NBIoT terminals carry out data transmission with base station, sends and receives both sides and keep complete synchronous.
In any of the above-described embodiment, it is preferable that the precision of the crystal oscillator includes following at least any one：10ppm、
15ppm、20ppm。
In this embodiment, general external crystal oscillator grade generally comprises 10ppm, 15ppm, 20ppm, but not limited to this.This
Invention uses crystal oscillator outside NBIoT terminal chips, and the selection of accuracy class includes any of the above item, but not limited to this, having
During body is implemented, depending on the requirement of communication that can eat dishes without rice or wine according to production cost demand and NBIoT.
In any of the above-described embodiment, it is preferable that the precision of crystal oscillator is 10ppm.
In this embodiment, general crystal oscillator, precision 10ppm, the crystal oscillator valence of this precision are used outside NBIoT terminal chips
Lattice are very low, therefore can effectively reduce cost, however its precision cannot meet NBIoT terminal called demands, be easy to cause communication effect
Fruit difference can not even communicate.The present invention by hardware algorithm realization to reach real-time clock using being synchronized in the chip, in chip
It is interior that signal synchronization is carried out by clock synchronization module, the requirement to exterior of terminal clock accuracy is greatly reduced, greatly simplifies system
Complexity reduces cost, and has the characteristics that small, is more in line with the demand of NBIoT terminals.
As shown in figure 3, the schematic block diagram of NBIoT terminal clocks synchronizing device according to an embodiment of the invention.Its
In, NBIoT terminals and base station use crystal oscillator, the NBIoT terminal clocks same by being wirelessly attached outside NBIoT terminal chips
Walking device 300 includes：
Detection unit 302, for detecting NPSS signals and NSSS signals in down channel；
Computing unit 304, for according to NPSS signals and NSSS signals, parsing the clock frequency of NBIoT terminal inners
fUEAnd the clock frequency f in downlink signal CF signalDL, and calculate fUEWith fDLDifference DELTA f；
First synchronization unit 306, the signal in all down channels for being received to NBIoT terminals are adopted again
Sample, wherein the signal in all down channels received to NBIoT terminals carries out the frequency and current downlink signal of resampling
Difference between carrier frequency is Δ f, then the downlink signal carrier frequency after resampling is switched in the clock frequency of NBIoT terminal inners；
Second synchronization unit 308, for detecting the data-signal in up channel, when the data-signal production in up channel
After life, resampling is carried out to data-signal, the clock frequency of the frequency and NBIoT terminal inners of resampling is carried out to data-signal
fUEBetween difference be-Δ f, then the signal carrier frequency after resampling be switched to the clock frequency in downlink signal CF signal.
NBIoT terminal clocks synchronizing device 300 provided by the invention, NBIoT terminal chips use general crystal oscillator outside,
In NBIOT terminal chips, first by detecting NPSS the and NSSS signals in down channel, present terminal internal clocking is parsed
Frequency fUEWith the clock frequency f in downlink signal CF signalDLDifference Δ f.Then will own by the hardware circuit in chip
The signal that down channel receives carries out resampling, and the difference on the frequency between the frequency and signal carrier frequency of resampling is Δ f.In this way,
Signal carrier frequency after resampling has just had been switched in NBIoT terminal inner clock frequencies.For up channel, also due to
Terminal chip internal clock frequencies precision is very low, needs to handle up channel.The data of portion's up channel in the chip
After signal generates, resampling is carried out to data-signal, the frequency of resampling and the difference on the frequency of chip interior clock frequency are-Δ
f.In this way, the signal carrier frequency after resampling has been switched to the clock in base station clock frequency i.e. downlink signal CF signal
Frequency fDL.Clock synchronizing method provided by the invention can make NBIoT terminal systems only use cheap general crystal oscillator, without
It needs to do clock source using expensive VCTCXO, system cost is greatly reduced；Reached in the chip by hardware algorithm realization
Real-time clock synchronizes, and carries out signal synchronization by clock synchronization module in the chip, is greatly reduced to exterior of terminal clock accuracy
Requirement, greatly simplify system complexity, power consumption and cost be greatly reduced.
As shown in figure 4, the schematic block diagram of NBIoT terminal clock synchronizing devices according to another embodiment of the invention.
Wherein, NBIoT terminals and base station use crystal oscillator, the NBIoT terminal clocks by being wirelessly attached outside NBIoT terminal chips
Synchronizing device 400 includes：
Detection unit 402, for detecting NPSS signals and NSSS signals in down channel；
Computing unit 404, for according to NPSS signals and NSSS signals, parsing the clock frequency of NBIoT terminal inners
fUEAnd the clock frequency f in downlink signal CF signalDL, and calculate fUEWith fDLDifference DELTA f；
First synchronization unit 406, the signal in all down channels for being received to NBIoT terminals are adopted again
Sample, wherein the signal in all down channels received to NBIoT terminals carries out the frequency and current downlink signal of resampling
Difference between carrier frequency is Δ f, then the downlink signal carrier frequency after resampling is switched in the clock frequency of NBIoT terminal inners；
Second synchronization unit 408, for detecting the data-signal in up channel, when the data-signal production in up channel
After life, resampling is carried out to data-signal, the clock frequency of the frequency and NBIoT terminal inners of resampling is carried out to data-signal
fUEBetween difference be-Δ f, then the signal carrier frequency after resampling be switched to the clock frequency in downlink signal CF signal；
Decoding unit 410, after the signal in all down channels received to NBIoT terminals carries out resampling,
For being decoded operation to the signal on down channel, the data carried on down channel are parsed.
In this embodiment, in NBIoT terminal systems, the frequency of downlink detection internal clocking and the clock for receiving data
Rate is poor, by internal algorithm by downlink data resampling to internal clock frequencies, after being carried out with using terminal internal clocking
Continuous decoding operation, solves the data carried on down channel, disclosure satisfy that needed for Internet of Things network mobile communication business transferring information
Transmission and switching performance demand.
As shown in figure 5, the schematic block diagram of NBIoT terminal clock synchronizing devices according to still a further embodiment.
Wherein, NBIoT terminals and base station use crystal oscillator, the NBIoT terminal clocks by being wirelessly attached outside NBIoT terminal chips
Synchronizing device 500 includes：
Detection unit 502, for detecting NPSS signals and NSSS signals in down channel；
Computing unit 504, for according to NPSS signals and NSSS signals, parsing the clock frequency of NBIoT terminal inners
fUEAnd the clock frequency f in downlink signal CF signalDL, and calculate fUEWith fDLDifference DELTA f；
First synchronization unit 506, the signal in all down channels for being received to NBIoT terminals are adopted again
Sample, wherein the signal in all down channels received to NBIoT terminals carries out the frequency and current downlink signal of resampling
Difference between carrier frequency is Δ f, then the downlink signal carrier frequency after resampling is switched in the clock frequency of NBIoT terminal inners；
Second synchronization unit 508, for detecting the data-signal in up channel, when the data-signal production in up channel
After life, resampling is carried out to data-signal, the clock frequency of the frequency and NBIoT terminal inners of resampling is carried out to data-signal
fUEBetween difference be-Δ f, then the signal carrier frequency after resampling be switched to the clock frequency in downlink signal CF signal；
Decoding unit 510, after the signal in all down channels received to NBIoT terminals carries out resampling,
For being decoded operation to the signal on down channel, the data carried on down channel are parsed；Transmitter unit 512,
After carrying out resampling to data-signal, for the data in the up channel after resampling to be transmitted to base station.
In this embodiment, in NBIoT terminal systems, the difference on the frequency of uplink application downlink detection, by interior
Upstream data resampling on internal clock frequencies to uplink output frequency, then is eated dishes without rice or wine to emit by algorithms by up channel
To base station, when realizing that NBIoT terminals carry out data transmission with base station, sends and receives both sides and keep complete synchronous.
In any of the above-described embodiment, it is preferable that the precision of the crystal oscillator includes following at least any one：10ppm、
15ppm、20ppm。
In this embodiment, general external crystal oscillator grade generally comprises 10ppm, 15ppm, 20ppm, but not limited to this.This
Invention uses crystal oscillator outside NBIoT terminal chips, and the selection of accuracy class includes any of the above item, but not limited to this, having
During body is implemented, depending on the requirement of communication that can eat dishes without rice or wine according to production cost demand and NBIoT.
In any of the above-described embodiment, it is preferable that the precision of crystal oscillator is 10ppm.
In this embodiment, general crystal oscillator, precision 10ppm, the crystal oscillator valence of this precision are used outside NBIoT terminal chips
Lattice are very low, therefore can effectively reduce cost, however its precision cannot meet NBIoT terminal called demands, be easy to cause communication effect
Fruit difference can not even communicate.The present invention by hardware algorithm realization to reach real-time clock using being synchronized in the chip, in chip
It is interior that signal synchronization is carried out by clock synchronization module, the requirement to exterior of terminal clock accuracy is greatly reduced, greatly simplifies system
Complexity reduces cost, and has the characteristics that small, is more in line with the demand of NBIoT terminals.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of NBIoT terminal clocks synchronous method, by being wirelessly attached, feature exists for the NBIoT terminals and base station
In outside using crystal oscillator, the clock synchronizing method includes the NBIoT terminal chips：
Detect the NPSS signals and NSSS signals in down channel；
According to the NPSS signals and the NSSS signals, the clock frequency f of the NBIoT terminal inners is parsedUEUnder and
Clock frequency f in row signal CF signalDL, and calculate fUEWith fDLDifference DELTA f；
Signal in all down channels received to the NBIoT terminals carries out resampling, wherein to NBIoT ends
Terminating the difference that the signal in all down channels for receiving carries out between the frequency and current downlink signal carrier frequency of resampling is
Δ f, then the downlink signal carrier frequency after resampling be switched in the clock frequency of the NBIoT terminal inners；
The data-signal in up channel is detected, after the data-signal in the up channel generates, to the data-signal
Carry out resampling, wherein the clock frequency f of the frequency and the NBIoT terminal inners of resampling is carried out to the data-signalUE
Between difference be-Δ f, then the uplink signal carrier frequency after resampling be switched to the clock in the downlink signal CF signal frequency
In rate.
2. NBIoT terminal clocks synchronous method according to claim 1, which is characterized in that described to NBIoT ends
After terminating the signal progress resampling in all down channels received, further include：
Operation is decoded to the signal on the down channel, parses the data carried on the down channel.
3. NBIoT terminal clocks synchronous method according to claim 1, which is characterized in that believe the data described
Number carry out resampling after, further include：
Data in up channel after resampling are transmitted to the base station.
4. NBIoT terminal clocks synchronous method according to any one of claim 1 to 3, which is characterized in that
The precision of the crystal oscillator includes following at least any one：10ppm、15ppm、20ppm.
5. NBIoT terminal clocks synchronous method according to claim 4, which is characterized in that
The precision of the crystal oscillator is 10ppm.
6. a kind of NBIoT terminal clocks synchronizing device, by being wirelessly attached, feature exists for the NBIoT terminals and base station
In outside using crystal oscillator, the clock synchronization apparatus includes the NBIoT terminal chips：
Detection unit, for detecting NPSS signals and NSSS signals in down channel；
Computing unit, for according to the NPSS signals and the NSSS signals, parsing the clock of the NBIoT terminal inners
Frequency fUEAnd the clock frequency f in downlink signal CF signalDL, and calculate fUEWith fDLDifference DELTA f；
First synchronization unit, the signal in all down channels for being received to the NBIoT terminals carry out resampling,
In, the signal in all down channels received to the NBIoT terminals carries out the frequency and current downlink signal of resampling
Difference between carrier frequency is Δ f, then the downlink signal carrier frequency after resampling is switched to the clock frequency of the NBIoT terminal inners
On；
Second synchronization unit, for detecting the data-signal in up channel, when the data-signal in the up channel generates
Afterwards, resampling is carried out to the data-signal, it is described that the frequency of resampling and the NBIoT terminals are carried out to the data-signal
Internal clock frequency fUEBetween difference be-Δ f, then the signal carrier frequency after resampling is switched to downlink signal carrier frequency letter
Clock frequency in number.
7. NBIoT terminal clocks synchronizing device according to claim 6, which is characterized in that described to NBIoT ends
After terminating the signal progress resampling in all down channels received, further include：
Decoding unit is parsed and is carried on the down channel for being decoded operation to the signal on the down channel
Data.
8. NBIoT terminal clocks synchronizing device according to claim 6, which is characterized in that believe the data described
Number carry out resampling after, further include：
Transmitter unit, for the data in the up channel after resampling to be transmitted to the base station.
9. the NBIoT terminal clock synchronous method according to any one of claim 6 to 8, which is characterized in that
The precision of the crystal oscillator includes following at least any one：10ppm、15ppm、20ppm.
10. NBIoT terminal clocks synchronizing device according to claim 9, which is characterized in that
The precision of the crystal oscillator is 10ppm.
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| CN201810018248.9A CN108377543B (en) | 2018-01-09 | 2018-01-09 | NBIoT terminal clock synchronization method and device |
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| US20040109498A1 (en) * | 2002-11-15 | 2004-06-10 | Kevin Miller | System and method for accelerated clock synchronization of remotely distributed electronic devices |
| CN101567705A (en) * | 2009-03-31 | 2009-10-28 | 中兴通讯股份有限公司 | Mobile terminal and uplink channel local frequency regulation method |
| CN102694762A (en) * | 2011-03-25 | 2012-09-26 | 北京新岸线无线技术有限公司 | Method for realizing synchronization of carrier and sampling clock, and user site device |
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