CN108811050A - Wake-up synchronous method, device and the computer-readable medium of wireless terminal - Google Patents

Wake-up synchronous method, device and the computer-readable medium of wireless terminal Download PDF

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Publication number
CN108811050A
CN108811050A CN201710296265.4A CN201710296265A CN108811050A CN 108811050 A CN108811050 A CN 108811050A CN 201710296265 A CN201710296265 A CN 201710296265A CN 108811050 A CN108811050 A CN 108811050A
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Prior art keywords
wireless terminal
synchronizing signal
wake
data length
timing
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CN201710296265.4A
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CN108811050B (en
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王硕
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Leadcore Technology Co Ltd
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Leadcore Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0248—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal dependent on the time of the day, e.g. according to expected transmission activity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0251—Power saving arrangements in terminal devices using monitoring of local events, e.g. events related to user activity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

The present invention provides a kind of wake-up synchronous method of wireless terminal, including：Before the wireless terminal enters sleep, timing wander range of the wireless terminal when waking up is assessed；It is determined according to the timing wander range and needs the data length L received after the wireless terminal wakes up；According to the down channel quality before the wireless terminal sleep, determines and need the synchronizing signal number Ns received after the wireless terminal wakes up；The practical wake-up moment of the wireless terminal is determined according to the data length L and the synchronizing signal number Ns；The wireless terminal enters sleep；When reaching at the practical wake-up moment, the wireless terminal is waken up.In addition, the present invention also provides wake-up synchronizing device, wireless terminal and the computer-readable mediums of corresponding wireless terminal.The present invention can be in the case where ensureing the reliability of synchronized result, the sleeping time of extend as far as possible wireless terminal, to reduce the power consumption of wireless terminal.

Description

Wake-up synchronous method, device and the computer-readable medium of wireless terminal
Technical field
The invention mainly relates to wireless communication terminal more particularly to the wake-up synchronous method and device of a kind of wireless terminal.
Background technology
It is well known that mobile terminal needs to save power consumption as far as possible.LTE (Long Term Evolution, length at present Phase evolution) terminal is required for waking up in advance and re-synchronize in IDLE states each period, according to re-synchronizing result adjustment terminal and net The timing of network side, and then frame data are paged with accurate timing receipt.The paging cycle of LTE terminal be 320ms, 640ms, 1280ms,2560ms.Fig. 1 shows the distributing position of LTE-FDD synchronizing signals.The reception data that LTE terminal is re-synchronized For Lresync_LTE(while including PSS (Primary synchronization signal, primary synchronization signal), SSS (Secondary synchronization signal, auxiliary synchronous signal)), it is receiving the synchrodata and is receiving paging frame The time of reservation process synchrodata and the time of the local timing of adjustment are also needed between data.
Synchronization has been redefined in NB-IoT (Narrow Band Internet of Things, narrowband Internet of Things) agreement Signal, that is, NPSS (Narrowband primary synchronization signal, narrowband primary synchronization signal) and NSSS (Narrowband secondary synchronization signal, narrowband auxiliary synchronous signal).Fig. 2 shows NB- The distributing position of IoT synchronizing signals.About the scene of sleep, NB-IoT is in addition to identical sleep scene (is slept under IDLE with LTE Sleep, sleep under DRX) outside, the scene also much increased newly needs to sleep saves power consumption with maximum possible, such as NPDCCH detections, tune Spend time delay, transmission GAP etc..According to current newest agreement, the duration of sleeping of these scenes is in several milliseconds (ms)~a few kiloseconds (s) Between.
If applied strategy is re-synchronized after the sleep awakening of LTE in NB-IoT terminals, can exist as following drawbacks：
1. terminal, which shifts to an earlier date wake-up point, to be unfavorable for optimised power consumption farther out.
The reason is as follows that：Due to NSSS interval relatively long (for 20ms), while including that the timeslice of NPSS and NSSS occurs Interval is also 20ms, it is contemplated that the time etc. of reservation process synchronizing signal then results in the need for for a long time waking up terminal in advance, influences end Hold power consumption.
In addition, under the idle state of some short time, it is more early due to shifting to an earlier date wake-up point, it can cause terminal that can not sleep, Also power consumption of terminal is influenced very much.
2. terminal receives regular length synchronizing signal after waking up also is unfavorable for optimised power consumption.
The reason is as follows that：Timing slip after terminal wakes up under actual conditions is related with several factors, therefore terminal wakes up every time Timing slip range afterwards is all not quite similar, either large or small, then waking up the data of reception equal length every time will certainly cause Reception data are long for certain scenes, and so as to cause terminal, sleeping time is not optimal in such a scenario, is affected yet The optimization of NB-IoT power consumption of terminal.
Invention content
It, can be the technical problem to be solved in the present invention is to provide wake-up synchronous method, the device of a kind of wireless terminal In the case of the reliability for ensureing synchronized result, the sleeping time of extend as far as possible wireless terminal, to reduce the work(of wireless terminal Consumption.
In order to solve the above technical problems, one aspect of the present invention provides a kind of wake-up synchronous method of wireless terminal, including： S1：Before the wireless terminal enters sleep, timing wander range of the wireless terminal when waking up is assessed；S2：According to institute It states timing wander range and determines and need the data length L received after the wireless terminal wakes up；S3：It is slept according to the wireless terminal Down channel quality before dormancy determines and needs the synchronizing signal number Ns received after the wireless terminal wakes up；S4：According to described The data length L and synchronizing signal number Ns determines the practical wake-up moment of the wireless terminal；S5：The wireless terminal into Enter sleep；S6：When reaching at the practical wake-up moment, the wireless terminal is waken up.
In one embodiment of this invention, the step S1 further includes：S11：Judge whether the timing wander range is big In equal to threshold value；If so, the wireless terminal is upon awakening, directly synchronization is obtained by searching net；If it is not, then executing institute Step S2 is stated to the step S6.
In one embodiment of this invention, the timing wander range by the wireless terminal clock characteristic, sleep when At least one of long, mobility and temperature determine.
In one embodiment of this invention, the data length L points are multi gear；The step S2 is floated according to the timing Shifting range selects one grade in the multi gear data length L.
In one embodiment of this invention, a synchronizing signal is included at least in the data length L.
In one embodiment of this invention, the data length L passes through L=2*Tclockwander+2*Trevssgap+(Ns-1)* Tss+TsslengthIt is calculated；Wherein TclockwanderTo estimate obtained clock drift amount, TrevssgapTo receive synchronizing signal Unilateral protective number, TssFor the period of synchronizing signal, TsslengthThe length occupied for a synchronizing signal.
In one embodiment of this invention, the synchronizing signal number Ns points are multi gear；The step S3 is according to Down channel quality selects one grade in the multi gear synchronizing signal number Ns.
In one embodiment of this invention, it is described it is practical wake up the moment by It is calculated；Wherein, tvalidstartTo receive valid data at the time of point, Tvalidrevstart-syncrevendIt is synchronized for this reception Time interval between the end point of signal data and the starting point for receiving valid data, TclockwanderTo estimate the drift of obtained clock Shifting amount, TrevssgapTo receive the unilateral protective number of synchronizing signal, TssFor the period of synchronizing signal, TsslengthFor a synchronous letter Number occupy length, Tsyncrevstart-wakeupBetween sleep awakening moment point and practical reception synchronization signal data starting point Time interval.
In one embodiment of this invention, the wake-up synchronous method of wireless terminal further includes：S7：Receive the synchronous letter Number, and wireless terminal timing adjustment is carried out according to the subsynchronous results of Ns.
In one embodiment of this invention, the wireless terminal is NB-IoT terminals.
In one embodiment of this invention, the synchronizing signal is NPSS.
Another aspect provides a kind of wake-up synchronizing devices of wireless terminal, including：Timing wander range is commented Module is estimated, for before the wireless terminal enters sleep, assessing timing wander range of the wireless terminal when waking up；Number According to length determination modul, need the data received long after the wireless terminal wakes up for being determined according to the timing wander range Spend L；Synchronizing signal number determining module, for according to the down channel quality before the wireless terminal sleep, determining the nothing Line terminal needs the synchronizing signal number Ns received after waking up；It is practical to wake up moment determining module, for long according to the data The degree L and synchronizing signal number Ns determines the practical wake-up moment of the wireless terminal；Sleeping modules are triggered, for triggering It states wireless terminal and enters sleep；Wake-up module, for when reaching at the practical wake-up moment, waking up the wireless terminal.
In one embodiment of this invention, the timing wander ranging assessments module is additionally operable to：Judge the timing wander Whether range is more than or equal to threshold value；If so, making the wireless terminal upon awakening, directly synchronization is obtained by searching net.
In one embodiment of this invention, the timing wander range by the wireless terminal clock characteristic, sleep when At least one of long, mobility and temperature determine.
In one embodiment of this invention, the data length L points are multi gear；The data length determining module is basis The timing wander range selects one grade in the multi gear data length L.
In one embodiment of this invention, a synchronizing signal is included at least in the data length L.
In one embodiment of this invention, the data length L passes through L=2*Tclockwander+2*Trevssgap+(Ns-1)* Tss+TsslengthIt is calculated；Wherein TclockwanderTo estimate obtained clock drift amount, TrevssgapTo receive synchronizing signal Unilateral protective number, TssFor the period of synchronizing signal, TsslengthThe length occupied for a synchronizing signal.
In one embodiment of this invention, the synchronizing signal number Ns points are multi gear；The synchronizing signal number determines Module is one grade selected according to the down channel quality in the multi gear synchronizing signal number Ns.
In one embodiment of this invention, it is described it is practical wake up the moment by It is calculated；Wherein, tvalidstartTo receive valid data at the time of point, Tvalidrevstart-syncrevendIt is synchronized for this reception Time interval between the end point of signal data and the starting point for receiving valid data, TclockwanderTo estimate the drift of obtained clock Shifting amount, TrevssgapTo receive the unilateral protective number of synchronizing signal, TssFor the period of synchronizing signal, TsslengthFor a synchronous letter Number occupy length, Tsyncrevstart-wakeupBetween sleep awakening moment point and practical reception synchronization signal data starting point Time interval.
In one embodiment of this invention, the wake-up synchronizing device of wireless terminal further includes：Synchronous signal receiver and timing Module is adjusted, wireless terminal timing adjustment is carried out for receiving the synchronizing signal, and according to the subsynchronous results of Ns.
In one embodiment of this invention, the wireless terminal is NB-IoT terminals.
In one embodiment of this invention, the synchronizing signal is NPSS.
Another aspect provides a kind of wireless terminals, including：Memory；And processor, wherein described deposit Reservoir includes the computer code stored thereon, and the code is configured as promoting the nothing when running on the processor Line terminal at least executes method as described above.
In one embodiment of this invention, the wireless terminal is NB-IoT terminals.
In one embodiment of this invention, the synchronizing signal is NPSS.
Another aspect provides a kind of including the computer-readable medium of the computer code stored thereon, institute It states computer code to be configured as when running on a processor, executes method as described above.
Compared with prior art, the present invention has the following advantages：
(1) according to the clock characteristic of wireless terminal, sleep duration, mobility, temperature etc. come when determining wake on wireless terminal Timing slip range, and determine to need the data length that receives based on timing slip range.In addition, also according to wireless terminal Down channel quality before sleep, come determine to change wake up after need the number of the synchronizing signal received.In this way, ensureing synchronized result Reliability in the case of, extend the sleeping time of wireless terminal, reduce the power consumption of wireless terminal.
(2) technical solution that NPSS is synchronized is used for NB-IoT terminals, as a result of with more short-period NPSS, therefore NB-IoT terminals can be waken up as far as possible lately, make NB-IoT terminals that there is longest sleeping time.
Description of the drawings
Fig. 1 is the schematic diagram of LTE-FDD synchronizing signal distributing positions.
Fig. 2 is the schematic diagram of NB-IoT synchronizing signal distributing positions
Fig. 3 is the flow chart of the wake-up synchronous method of the wireless terminal of one embodiment of the invention.
Fig. 4 is the relationship signal of the timing wander range and data length for being less than half of subframe of one embodiment of the invention Figure.
Fig. 5 is the relationship signal of the timing wander range and data length for being equal to two subframes of one embodiment of the invention Figure.
Fig. 6 is the flow chart of the wake-up synchronous method of the NB-IoT terminals of one embodiment of the invention.
Fig. 7 is that the NB-IoT terminals of one embodiment of the invention receive a NPSS and data length is L0Sleep awakening when Carve schematic diagram.
Fig. 8 is the structural schematic diagram of the wake-up synchronizing device of the wireless terminal of one embodiment of the invention.
Fig. 9 is the structural schematic diagram of the wireless terminal of one embodiment of the invention.
Figure 10 is the schematic diagram of the computer-readable medium of an embodiment.
Specific implementation mode
For the above objects, features and advantages of the present invention can be clearer and more comprehensible, below in conjunction with attached drawing to the tool of the present invention Body embodiment elaborates.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still the present invention can be with Implemented different from other manner described here using other, therefore the present invention do not limited by following public specific embodiment System.
As shown in the application and claims, unless context clearly prompts exceptional situation, " one ", "one", " one The words such as kind " and/or "the" not refer in particular to odd number, may also comprise plural number.It is, in general, that term " comprising " only prompts to wrap with "comprising" Include clearly identify the step of and element, and these steps and element do not constitute one it is exclusive enumerate, method or equipment The step of may also including other or element.
Fig. 3 is the flow chart of the wake-up synchronous method of the wireless terminal of one embodiment of the invention.Referring to FIG. 3, wireless whole The wake-up synchronous method 10 at end includes mainly：
S1：Before wireless terminal enters sleep, timing wander range of the assessment wireless terminal when waking up；
S2：It is determined according to timing wander range and needs the data length L received after wireless terminal wakes up；
S3：According to the down channel quality before wireless terminal sleep, determines and need the synchronization received after wireless terminal wakes up Signal number Ns；
S4：According to data length L and synchronizing signal number NsDetermine the practical wake-up moment of wireless terminal；
S5：Wireless terminal enters sleep；
S6：When actually waking up moment arrival, wake on wireless terminal.
Optionally, step S1 can also include step S11：Judge whether timing wander range is more than or equal to threshold value；If It is that then wireless terminal upon awakening, directly obtains synchronization by searching net；If it is not, thening follow the steps S2 to step S6.
Optionally, there can also be step S7 after step S6：Synchronizing signal is received, and according to NsSubsynchronous result into Row wireless terminal timing adjustment.
In step sl assessment wireless terminal wake up when timing wander range can by wireless terminal clock characteristic, Duration, mobility, the temperature etc. of sleeping determine.For example, (1) is estimated according to radio frequency, for the slow clocks of 32K, frequency drift In 10ppm or so, the drift that temperature change introduces is also in 10ppm or so；(2) according to moving velocity of terminal, sleep duration, terminal Baseband sampling rate can calculate the timing slip introduced due to terminal changes with base station relative displacement；It (3) can be by right Selected slow clock carries out experiment simulation, verification, to make full use of its physical characteristic, when to more accurately estimate slow The timing wander range of clock.
Determine that the principle of data length L is the feelings for ensureing to include at least a synchronizing signal in data length L in step s 2 Under condition, keep data length L small as far as possible.Preferably, data length L can be calculated by formula (1),
L=2*Tclockwander+2*Trevssgap+(Ns-1)*Tss+Tsslength (1)
Wherein TclockwanderTo estimate obtained clock drift amount, TrevssgapTo receive the unilateral protective number of synchronizing signal, TssFor the period of synchronizing signal, TsslengthThe length occupied for a synchronizing signal.
Fig. 4 shows the relationship of the timing wander range and data length L less than half of subframe.Referring to FIG. 4, in terminal T at the time of before into sleep0, local timing and network timing synchronization.When terminal wakes up, local timing is relative to network timing Delay Tclockwander(being less than half of subframe).In t2Moment, network-side start to send synchronizing signal.Since terminal is by sleeping Has timing wander afterwards, if terminal is with the synchronizing signal delivery time t in local timing3Start to receive synchronizing signal, then it can be with It was found that terminal can not receive the synchronizing signal completely at this time.Therefore, in order to timing wander, connecing completely Receive synchronizing signal, synchronizing signal delivery time t of the present invention in local timing3T in advanceclockwander+Trevssgap(i.e. in t1When Carve) start to receive synchronizing signal.Further, since the timing wander range that estimates and can not know in advance or delay, because This, the present invention and the synchronizing signal end time t in local timing4Delay Tclockwander+Trevssgap(i.e. in t6Moment) Stop receiving synchronizing signal.The data length L that terminal receives as a result, is t1And t6Time interval, that is, by formula (1) institute Calculated time span.
Fig. 5 shows the relationship of the timing wander range and data length L equal to two subframes.Referring to FIG. 5, in terminal T at the time of before into sleep0, local timing and network timing synchronization.When terminal wakes up, local timing is relative to network timing It is advanced by two subframes.Since terminal has the timing wander of two subframes after sleep, in order to receive completely Synchronizing signal, synchronizing signal delivery time t of the present invention in local timing3Time (the T of two subframes in advanceclockwander) plus Upper unilateral protective number (Trevssgap) (i.e. in t1Moment) start to receive synchronizing signal, and the synchronizing signal in local timing is whole Only moment t4Delay the time (T of two subframesclockwander) add unilateral protective number (Trevssgap) (i.e. in t6Moment) just stop Receive synchronizing signal.The data length L that terminal receives as a result, is t1And t6Time interval, that is, calculated by formula (1) The time span gone out.
Preferably, it is multi gear that can divide data length L, for example, timing wander corresponds to L less than half of subframe0, timing drift It moves and corresponds to L less than a subframe more than or equal to half of subframe1, and so on.It is Ke Yijian after multi gear at L points by data length Vertical look-up table, can quickly and easily determine data length L according to timing wander range, and from carrying out such as formula (1) Calculating.
Synchronizing signal number N that needs receive is determined according to down channel quality in step s3s, downlink letter therein Road quality can be SNR (Signal-to-noise ratio, signal-to-noise ratio), the SINR (Signal of synchronizing signal, reference signal To Interference plus Noise Ratio, signal with interference and noise ratio), CNR (Carrier to Noise Ratio, carrier-to-noise ratio) and CINR (Carrier to Interference plus Noise Ratio, carrier wave and interference and noise One or more of than), synchronizing signal number N thereinsFor nonnegative integer.
Likewise, can be by synchronizing signal number NsIt is divided into multi gear, i.e., multiple ranges is divided into according to down channel quality, And these ranges are corresponded respectively into a synchronizing signal number Ns.In this way, can equally establish look-up table, with can be under Row channel quality quickly and easily quickly determines synchronizing signal number Ns。
In step s 4 according to data length L and synchronizing signal number NsIt the practical wake-up moment for determining wireless terminal, can To be calculated by formula (2),
Wherein, tvalidstartTo receive valid data (such as page corresponding NPDCCH in NB-IoT etc.) at the time of point, Tvalidrevstart-syncrevendFor the time between the end point and the starting point for receiving valid data of this reception synchronization signal data Interval, TclockwanderTo estimate obtained clock drift amount, TrevssgapTo receive the unilateral protective number of synchronizing signal, TssIt is same Walk the period of signal, TsslengthFor the length that a synchronizing signal occupies, Tsyncrevstart-wakeupFor sleep awakening moment point with The practical time interval received between synchronization signal data starting point.
Preferably, Tsyncrevstart-wakeupNeeded for the time handled needed for synchronizing signal and the local timing of adjustment The sum of time.
Preferably, the synchronizing signal number N if desired receiveds> 1, then during step S7 receives synchronizing signal, Terminal can carry out suspend mode between receiving two adjacent synchronizing signals.
Obtain the wake-up synchronous method for illustrating above-mentioned wireless terminal for synchronizing using NPSS by NB-IoT terminals below.
Fig. 6 is the flow chart of the wake-up synchronous method of the NB-IoT terminals of one embodiment of the invention.Referring to FIG. 6, NB- The wake-up synchronous method 20 of IoT terminals includes mainly：
Step 201：NB-IoT terminals, which determine, can enter sleep；
Step 202：Assess timing wander range of the NB-IoT terminals when waking up；
Step 203：Judge whether timing wander is more than or equal to threshold value；If so, thening follow the steps 204；If it is not, then executing Step 205；
Step 204：NB-IoT terminals are synchronized by searching net；After synchronization, step 215 is executed；
Step 205：It is determined according to timing wander range and needs the data length L received after NB-IoT terminals wake upi；
Step 206：According to down channel quality, determine that the when of waking up needs to receive the number N of NPSSs, and it is initialized；
Step 207：According to data length LiWith number Ns, calculate the practical wake-up moment of NB-IoT terminals；
Step 208：NB-IoT terminals enter sleep；
Step 209：When actually waking up moment arrival, NB-IoT terminals are waken up, to prepare to receive data；
Step 210：Judge NsWhether zero is equal to；If it is not, thening follow the steps 211；If so, thening follow the steps 214：
Step 211：According to data length LiReceive NPSS；
Step 212：Export synchronized result；
Step 213：To receiving the number N of NPSSsIt carries out subtracting one certainly, and returns to step 210；
Step 214：According to NsSubsynchronous result carries out NB-IoT terminal timing adjustments；
Step 215：Receive effective downlink data；
Step 216：Terminate.
Preferably, step 205 is to determine out data length LiWhich shelves in multi gear belonged to.Correspondingly, in step 211 In, it is according to the data length L determinediAffiliated shelves carry out NPSS receptions.
Fig. 7 is that the NB-IoT terminals of one embodiment of the invention receive a NPSS and data length is L0Sleep awakening when Carve schematic diagram.Referring to FIG. 7, NB-IoT terminals judge that sleep can be entered in the N0 subframes of local timing, and calculate reality The moment is waken up, that is, executes step 201 to step 207；Then NB-IoT terminals enter sleep, i.e. step 208, wherein actually sleep Sleep time tsleepIt can be determined by entering sleep moment and practical wake-up moment；In the initial time of the N1 subframes of local timing, The practical sleep moment reaches, and wakes up NB-IoT terminals, and with data length L0A NPSS is received, that is, executes step 209 to step Rapid 213；Time interval between the end point and the starting point for receiving valid data of this reception synchronization signal data Tvalidrevstart-syncrevendInterior, NB-IoT terminals carry out NB-IoT terminal timing adjustments according to synchronized result, that is, execute step 214；In the initial time of the N2 subframes of local timing, NB-IoT terminals start to receive effective downlink data, that is, execute step 215。
The distributing positions of the NB-IoT synchronizing signals gone out as shown in Figure 2 it is found that in each radio frequency frame tool there are one NPSS, Its time interval is 10ms.Relative to the time interval of NSSS and NPSS and the NSSS 20ms occurred simultaneously, NPSS have compared with Short time interval, therefore, NB-IoT terminals are synchronized using NPSS in the present embodiment, can wake up NB- as far as possible lately IoT terminals, with longest sleeping time.
Fig. 8 is the structural schematic diagram of the wake-up synchronizing device of the wireless terminal of one embodiment of the invention.Referring to FIG. 8, nothing The wake-up synchronizing device 30 of line terminal includes：
Timing wander ranging assessments module 31, for before wireless terminal enters sleep, assessment wireless terminal to be when waking up Timing wander range；
Data length determining module 32 needs the number received for being determined according to timing wander range after wireless terminal wakes up According to length L；
Synchronizing signal number determining module 33, for according to the down channel quality before wireless terminal sleep, determining wireless Terminal needs the synchronizing signal number Ns received after waking up；
It is practical to wake up moment determining module 34, for determining wireless terminal according to data length L and synchronizing signal number Ns The practical wake-up moment；
Sleeping modules 35 are triggered, enter sleep for triggering wireless terminal；
Wake-up module 36, for when actually waking up moment arrival, wake on wireless terminal to be to prepare to receive synchronizing signal.
Optionally, the wake-up synchronizing device 30 of wireless terminal can also have synchronous signal receiver and timing adjustment module 37, carry out wireless terminal timing adjustment for receiving synchronizing signal, and according to the subsynchronous results of Ns.
Optionally, timing wander ranging assessments module 31 is additionally operable to judge whether timing wander range is more than or equal to thresholding Value；If so, making wireless terminal upon awakening, directly synchronization is obtained by searching net.
Optionally, timing wander ranging assessments module 31 is the clock characteristic, sleep duration, mobility according to wireless terminal With the determining timing wander range of at least one of temperature.
Data length determining module 32 determines that the principle of data length L is to ensure that one is included at least in data length L synchronizes In the case of signal, keep data length L small as far as possible.In a non-limiting embodiment, data length L is divided into more Shelves, data length determining module 32 are one grades selected according to timing wander range in multi gear data length L.Preferably, data Length determination modul 32 is to calculate data length L by formula (3),
L=2*Tclockwander+2*Trevssgap+(Ns-1)*Tss+Tsslength (3)
Wherein TclockwanderTo estimate obtained clock drift amount, TrevssgapTo receive the unilateral protective number of synchronizing signal, TssFor the period of synchronizing signal, TsslengthThe length occupied for a synchronizing signal.
Synchronizing signal number determining module 33 can be according to the SNR (Signal-to-noise of synchronizing signal, reference signal Ratio, signal-to-noise ratio), SINR (Signal to Interference plus Noise Ratio, signal and interference and noise Than), CNR (Carrier to Noise Ratio, carrier-to-noise ratio) and CINR (Carrier to Interference plus Noise Ratio, carrier wave and interference and noise ratio) one or more of determine synchronizing signal number N that needs receives, Synchronizing signal number N thereinsFor nonnegative integer.Likewise, synchronizing signal number determining module 33 can be by synchronizing signal Number NsIt is divided into multi gear, i.e., multiple ranges is divided into according to down channel quality, and these ranges are corresponded respectively into a synchronization Signal number Ns。
Optionally, the practical moment determining module 34 that wakes up can calculate the practical wake-up moment by formula (4),
Wherein, tvalidstartTo receive valid data (such as page corresponding NPDCCH in NB-IoT etc.) at the time of point, Tvalidrevstart-syncrevendFor the time between the end point and the starting point for receiving valid data of this reception synchronization signal data Interval, TclockwanderTo estimate obtained clock drift amount, TrevssgapTo receive the unilateral protective number of synchronizing signal, TssIt is same Walk the period of signal, TsslengthFor the length that a synchronizing signal occupies, Tsyncrevstart-wakeupFor sleep awakening moment point with The practical time interval received between synchronization signal data starting point.
Preferably, Tsyncrevstart-wakeupNeeded for the time handled needed for synchronizing signal and the local timing of adjustment The sum of time.
Preferably, the synchronizing signal number N if desired receiveds> 1, then synchronous signal receiver and timing adjustment module 37 exist During receiving synchronizing signal, wireless terminal can carry out suspend mode between receiving two adjacent synchronizing signals.
Preferably, above-mentioned wireless terminal can be NB-IoT terminals, and synchronizing signal can be NPSS.
Fig. 9 is the structural schematic diagram of the wireless terminal of one embodiment of the invention.Referring to FIG. 9, device 40 includes memory 41 and processor 42.It is stored with computer code on memory 41, when be configured as ought be on processor 42 for the computer code Device 40 is promoted at least to execute wake-up synchronous method as described above when operation.Preferably, wireless terminal 40 is NB-IoT terminals, Synchronizing signal is NPSS.
Figure 10 is the schematic diagram of the computer-readable medium of an embodiment.It is stored with computer on computer-readable medium 50 Code, when the computer code is configured as executing wake-up synchronous method as described above when running on a processor.
Those skilled in the art will further appreciate that, the various illustratives described in conjunction with the embodiments described herein Logic plate, module, circuit and algorithm steps can be realized as electronic hardware, computer software or combination of the two.It is clear Explain to Chu this interchangeability of hardware and software, various illustrative components, frame, module, circuit and step be above with Its functional form makees generalization description.Such functionality be implemented as hardware or software depend on concrete application and It is applied to the design constraint of total system.Technical staff can realize each specific application described with different modes Functionality, but such realization decision should not be interpreted to cause departing from the scope of the present invention.
In conjunction with presently disclosed embodiment describe various illustrative logic modules and circuit can use general processor, Digital signal processor (DSP), application-specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable logic Device, discrete door or transistor logic, discrete hardware component or its be designed to carry out any group of function described herein It closes to realize or execute.General processor can be microprocessor, but in alternative, which can be any routine Processor, controller, microcontroller or state machine.Processor is also implemented as the combination of computing device, such as DSP With the combination of microprocessor, multi-microprocessor, one or more microprocessors to cooperate with DSP core or any other this Class configures.
It can be embodied directly in hardware, in by processor in conjunction with the step of method or algorithm that embodiment disclosed herein describes It is embodied in the software module of execution or in combination of the two.Software module can reside in RAM memory, flash memory, ROM and deposit Reservoir, eprom memory, eeprom memory, register, hard disk, removable disk, CD-ROM or known in the art appoint In the storage medium of what other forms.Exemplary storage medium is coupled to processor so that the processor can be from/to the storage Medium reads and writees information.In alternative, storage medium can be integrated into processor.Pocessor and storage media can It resides in ASIC.ASIC can reside in user terminal.In alternative, pocessor and storage media can be used as discrete sets Part is resident in the user terminal.
In one or more exemplary embodiments, described function can be in hardware, software, firmware, or any combination thereof Middle realization.If being embodied as computer program product in software, each function can be used as the instruction of one or more items or generation Code may be stored on the computer-readable medium or is transmitted by it.Computer-readable medium includes computer storage media and communication Both media comprising any medium for facilitating computer program to shift from one place to another.Storage medium can be can quilt Any usable medium that computer accesses.It is non-limiting as example, such computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage apparatus can be used to carrying or store instruction Or data structure form desirable program code and any other medium that can be accessed by a computer.Any connection is also by by rights Referred to as computer-readable medium.For example, if software is using coaxial cable, fiber optic cables, twisted-pair feeder, digital subscriber line (DSL) or the wireless technology of such as infrared, radio and microwave etc is passed from web site, server or other remote sources It send, then the coaxial cable, fiber optic cables, twisted-pair feeder, DSL or such as infrared, radio and microwave etc is wireless Technology is just included among the definition of medium.Disk (disk) and dish (disc) as used herein include compression dish (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc, which disk (disk) are often reproduced in a manner of magnetic Data, and dish (disc) with laser reproduce data optically.Combinations of the above should also be included in computer-readable medium In the range of.
Although the present invention is described with reference to current specific embodiment, those of ordinary skill in the art It should be appreciated that above embodiment is intended merely to illustrate the present invention, can also make in the case of no disengaging spirit of that invention Go out various equivalent change or replacement, therefore, as long as to the variation of above-described embodiment, change in the spirit of the present invention Type will all be fallen in the range of following claims.

Claims (26)

1. a kind of wake-up synchronous method of wireless terminal, including：
S1：Before the wireless terminal enters sleep, timing wander range of the wireless terminal when waking up is assessed；
S2：It is determined according to the timing wander range and needs the data length L received after the wireless terminal wakes up；
S3：According to the down channel quality before the wireless terminal sleep, determines and need to receive after the wireless terminal wakes up Synchronizing signal number Ns；
S4：According to the data length L and the synchronizing signal number NsDetermine the practical wake-up moment of the wireless terminal；
S5：The wireless terminal enters sleep；
S6：When reaching at the practical wake-up moment, the wireless terminal is waken up.
2. according to the method described in claim 1, it is characterized in that, the step S1 further includes：
S11：Judge whether the timing wander range is more than or equal to threshold value；If so, the wireless terminal is upon awakening, directly It connected and searches net to obtain synchronization；If it is not, then executing the step S2 to the step S6.
3. according to the method described in claim 1, it is characterized in that, the timing wander range by the wireless terminal clock At least one of characteristic, sleep duration, mobility and temperature determine.
4. according to the method described in claim 1, it is characterized in that, the data length L points are multi gear；The step S2 is root One grade in the multi gear data length L is selected according to the timing wander range.
5. according to the method described in claim 1, it is characterized in that, including at least a synchronizing signal in the data length L.
6. according to the method described in claim 1, it is characterized in that, the data length L passes through
L=2*Tclockwander+2*Trevssgap+(Ns-1)*Tss+Tsslength
It is calculated；Wherein TclockwanderTo estimate obtained clock drift amount, TrevssgapTo receive the unilateral guarantor of synchronizing signal Shield amount, TssFor the period of synchronizing signal, TsslengthThe length occupied for a synchronizing signal.
7. according to the method described in claim 1, it is characterized in that, the synchronizing signal number NsIt is divided into multi gear；The step S3 It is that the multi gear synchronizing signal number N is selected according to the down channel qualitysIn one grade.
8. according to the method described in claim 1, it is characterized in that, it is described it is practical wake up the moment by
twakeup=tvalidrevstart-Tvalidrevstart-syncrevend-2*Tclockwander-2*Trevssgap
-(Ns-1)*Tss-Tsslength-Tsyncrevstart-wakeup
It is calculated；Wherein, tvalidstartTo receive valid data at the time of point, Tvalidrevstart-syncrevendIt is same for this reception Walk the time interval between the end point of signal data and the starting point for receiving valid data, TclockwanderTo estimate obtained clock Drift value, TrevssgapTo receive the unilateral protective number of synchronizing signal, TssFor the period of synchronizing signal, TsslengthFor a synchronization The length that signal occupies, Tsyncrevstart-wakeupBetween sleep awakening moment point and practical reception synchronization signal data starting point Time interval.
9. according to the method described in claim 1, it is characterized in that, further including：
S7：The synchronizing signal is received, and according to NsSubsynchronous result carries out wireless terminal timing adjustment.
10. according to the method described in claim 1, it is characterized in that, the wireless terminal is NB-IoT terminals.
11. according to the method described in claim 10, it is characterized in that, the synchronizing signal is NPSS.
12. a kind of wake-up synchronizing device of wireless terminal, including：
Timing wander ranging assessments module is waking up for before the wireless terminal enters sleep, assessing the wireless terminal When timing wander range；
Data length determining module needs after the wireless terminal wakes up to receive for being determined according to the timing wander range Data length L；
Synchronizing signal number determining module, for according to the down channel quality before the wireless terminal sleep, determining the nothing Line terminal needs the synchronizing signal number N received after waking ups；
It is practical to wake up moment determining module, for according to the data length L and the synchronizing signal number NsIt determines described wireless The practical wake-up moment of terminal；
Sleeping modules are triggered, enter sleep for triggering the wireless terminal；
Wake-up module, for when reaching at the practical wake-up moment, waking up the wireless terminal.
13. device according to claim 12, which is characterized in that the timing wander ranging assessments module is additionally operable to：Sentence Whether the timing wander range of breaking is more than or equal to threshold value；If so, making the wireless terminal upon awakening, directly by searching Net obtains synchronization.
14. device according to claim 12, which is characterized in that the timing wander range by the wireless terminal when At least one of clock characteristic, sleep duration, mobility and temperature determine.
15. device according to claim 12, which is characterized in that the data length L points are multi gear；The data length Determining module is one grade selected according to the timing wander range in the multi gear data length L.
16. device according to claim 12, which is characterized in that include at least one in the data length L and synchronize and believe Number.
17. device according to claim 12, which is characterized in that the data length L passes through
L=2*Tclockwander+2*Trevssgap+(Ns-1)*Tss+Tsslength
It is calculated；Wherein TclockwanderTo estimate obtained clock drift amount, TrevssgapTo receive the unilateral guarantor of synchronizing signal Shield amount, TssFor the period of synchronizing signal, TsslengthThe length occupied for a synchronizing signal.
18. device according to claim 12, which is characterized in that the synchronizing signal number NsIt is divided into multi gear；The synchronization Signal number determining module is to select the multi gear synchronizing signal number N according to the down channel qualitysIn one grade.
19. device according to claim 12, which is characterized in that it is described it is practical wake up the moment by
twakeup=tvalidrevstart-Tvalidrevstart-syncrevend-2*Tclockwander-2*Trevssgap
-(Ns-1)*Tss-Tsslength-Tsyncrevstart-wakeup
It is calculated；Wherein, tvalidstartTo receive valid data at the time of point, Tvalidrevstart-syncrevendIt is same for this reception Walk the time interval between the end point of signal data and the starting point for receiving valid data, TclockwanderTo estimate obtained clock Drift value, TrevssgapTo receive the unilateral protective number of synchronizing signal, TssFor the period of synchronizing signal, TsslengthFor a synchronization The length that signal occupies, Tsyncrevstart-wakeupBetween sleep awakening moment point and practical reception synchronization signal data starting point Time interval.
20. device according to claim 12, which is characterized in that further include：
Synchronous signal receiver and timing adjustment module, for receiving the synchronizing signal, and according to NsSubsynchronous result carries out wireless Terminal timing adjustment.
21. device according to claim 12, which is characterized in that the wireless terminal is NB-IoT terminals.
22. device according to claim 21, which is characterized in that the synchronizing signal is NPSS.
23. a kind of wireless terminal, including：
Memory；And
Processor, wherein the memory includes the computer code stored thereon, the code is configured as when at the place The wireless terminal is promoted at least to execute such as claim 1-19 any one of them methods when being run on reason device.
24. wireless terminal according to claim 23, which is characterized in that the wireless terminal is NB-IoT terminals.
25. wireless terminal according to claim 24, which is characterized in that the synchronizing signal is NPSS.
26. a kind of including the computer-readable medium of the computer code stored thereon, the computer code is configured as working as When running on a processor, such as claim 1-19 any one of them methods are executed.
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