CN101222288A - IP network transmission method, system and equipment automatically adapting network jitter - Google Patents
IP network transmission method, system and equipment automatically adapting network jitter Download PDFInfo
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- CN101222288A CN101222288A CNA2008100091537A CN200810009153A CN101222288A CN 101222288 A CN101222288 A CN 101222288A CN A2008100091537 A CNA2008100091537 A CN A2008100091537A CN 200810009153 A CN200810009153 A CN 200810009153A CN 101222288 A CN101222288 A CN 101222288A
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Abstract
The invention discloses an IP network transmission method for automatically adapting network dithering, which comprises the following steps: IP data messages in a plurality of cycles are received; according to the IP data messages in a plurality of cycles, whether the dithering excesses a set dithering threshold is judged; if the dithering excesses the set dithering threshold, an amplitude of adjusting clock frequency is reduced to achieve the aim of adjusting a loop bandwidth of a phase-locked loop; if the dithering does not excess the set dithering threshold, a local clock is adjusted according to an actual frequency deviation value. The invention discloses an IP network transmission system and equipment for automatically adapting network dithering. When IP restores the clock, according to the network dithering situation, the invention can automatically select proper parameters for adjusting local clock frequency, thereby achieving the aim of clock synchronization, ensuring the rapidity of the clock synchronization and meeting the accuracy of the clock synchronization.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of IP (InternetProtocol, Internet protocol) network transfer method, system and equipment of automatically adapting network jitter.
Background technology
The clock synchronization of BTS network nodes such as (Base Transceiver Station, base transceiver stations) is the key technology that receives much concern always, and the performance of clock synchronization directly influences the base station communication quality.Present existing simultaneous techniques has employing GPS (Global Position System, global positioning system), BITS (Building Integrated Timing Supply System, building integrated timing supply) etc. reference clock source is realized clock synchronization, PWE3 (Pseudo Wire Emulation edge-to-edge, the pseudo-circuit emulation of edge-to-edge) class adds up the recovered clock method based on the butt joint packet receiving, or IP etc. realizes clock synchronization.
Adopt reference clock sources such as GPS or BITS to carry out clock synchronization, be exactly to compare reference clock source and local clock frequency, calculate the frequency departure between reference clock source and the local clock, the local clock frequency is adjusted, reach the long-term synchronous purpose of maintenance local clock and reference clock source.Realize clock synchronization for reference clock sources such as GPS, BITS, the clock recovered ratio of precision is higher, but relative cost is also high, and the engineering construction complexity does not fit into present BTS service all-IP requirement.
Be adaptation BTS service all-IP demand, and reduce base station construction cost and engineering complexity, a kind of scheme of using IP network tranmitting data register adaptive clock is arranged, as shown in Figure 1 in the prior art.Utilize standard agreement transfer clock bag in IP network, the base station uses the timestamp information that carries in the clock bag to carry out clock recovery.
In realizing process of the present invention, the inventor finds to exist in the prior art following defective:
The base station uses the timestamp information that carries in the clock bag to carry out clock recovery scheme to be subjected to network parameter such as network delay to influence bigger.The IP network time delay mainly is changed to three kinds of modes: network delay changes the drift that causes; The bigger shake that network delay exists; Network delay drift and shake coexistence.In case there is bigger shake in the network, the clock recovered performance will be very poor, in the present IP clock recovery scheme, for filtering network jitter and the influence of drift to frequency deviation, can adopt long filtering, cause the clock synchronization overlong time, influence is professional to be used, if and reference source occurs needing the long period just can reflect than big frequency deviation.If but when adopting the less filtering cycle can cause shake big, can cause exporting clock can't meet the demands.
Summary of the invention
The embodiment of the invention provides a kind of IP network transmission method, system and equipment of automatically adapting network jitter, improves the performance of IP clock, guarantees clock recovered filtering network jitter to greatest extent.
The embodiment of the invention provides a kind of IP network transmission method of automatically adapting network jitter, may further comprise the steps:
Receive the IP datagram literary composition in a plurality of cycles;
Judge according to the IP datagram literary composition in described a plurality of cycles whether shake exceeds setting shake thresholding;
Set the shake thresholding if exceed, then dwindle the clock frequency adjusting range; Do not set the shake thresholding if do not exceed, then adjust local clock according to the actual frequency deviations value.
The embodiment of the invention provides a kind of IP network transmission system of automatically adapting network jitter, comprising:
Server is used for sending the IP datagram literary composition to network node, and described message carries the timestamp of identification server clock information etc.;
Network node, be used to receive a plurality of IP datagram literary compositions that described server sends, judge according to described IP datagram literary composition whether shake exceeds setting shake thresholding, if exceeding, shake sets the shake thresholding, then dwindle the clock frequency adjusting range, do not set the shake thresholding if shake does not exceed, then adjust local clock according to the actual frequency deviations value.
The embodiment of the invention provides a kind of network node, comprising:
Receiving element is used to receive a plurality of IP datagram literary compositions that described server sends;
Judging unit is used for judging according to described a plurality of IP datagram literary compositions whether shake exceeds setting shake thresholding;
Adjustment unit is used for shake and exceeds when setting the shake thresholding, dwindles the clock frequency adjusting range, and shake does not exceed when setting the shake thresholding, then adjusts local clock according to the actual frequency deviations value.
In the embodiments of the invention, when the IP recovered clock,, select suitable parameters to carry out the adjustment of local clock frequency automatically, reach the purpose of clock synchronization, guarantee the rapidity of clock synchronization, also satisfy the accuracy of clock synchronization simultaneously according to the network jitter situation.
Description of drawings
Fig. 1 is a kind of use IP network tranmitting data register adaptive clock scheme schematic diagram in the prior art;
Fig. 2 is the IP network transmission method flow chart of a kind of automatically adapting network jitter in the embodiment of the invention;
Fig. 3 is the IP network transmission system structure chart of automatically adapting network jitter in the embodiment of the invention.
Embodiment
Analyze according to a plurality of IP datagram literary compositions in the embodiment of the invention, analyze frequency deviation and change whether there is shake, shake exceeds under the situation of setting the shake thresholding in judging network, and in conjunction with SSM (the Synchronization Status Message in the clock bag of server transmission, Synchronization Status Message) status word is dwindled the clock frequency adjusting range, reaches to adjust the purpose that PLL loop bandwidth narrows down, the influence of network jitter to frequency reduced, guarantee the performance of recovered clock.Shake does not exceed under the situation of setting the shake thresholding in judging network, think that promptly the frequency deviation that calculates is the actual deviation between local clock and the clock server, adjust local clock according to the actual frequency deviations value this moment, promptly adjust PLL loop bandwidth, thereby reach the purpose that clock combines with good filter effect fast synchronously.
The embodiment of the invention provides a kind of IP network transmission method of automatically adapting network jitter, as shown in Figure 2, may further comprise the steps:
Step s201 receives the sampled data (for example, the IP datagram literary composition) in a plurality of cycles, and described message carries the timestamp of identification server clock information etc.
Step s202 judges according to described a plurality of IP datagram literary compositions whether shake exceeds setting shake thresholding, sets the shake thresholding if shake exceeds, and commentaries on classics step s203 sets the shake thresholding if shake does not exceed, and changes step s204.Wherein, deterministic process specifically comprises: according to a plurality of IP datagram literary compositions, calculate the frequency deviation value between all adjacent IP datagram literary compositions; Calculate the mean value of all frequency deviation values; Calculate the difference between the adjacent frequency deviation value, compare with mean value, when the difference between the adjacent frequency deviation value exceeded the default thresholding of described mean value, network jitter exceeded setting shake thresholding between the described adjacent frequency deviation value; When the difference between all adjacent frequency deviation values all when the default thresholding of described mean value is following, network jitter does not exceed and sets the shake thresholding between the described adjacent frequency deviation value.
For example, at first according to a plurality of IP datagram literary compositions, calculate a series of frequency deviation value Δ f
0, Δ f
1..., Δ f
N-1, calculate the mean value of all frequency deviations then,
Δf
var＝(Δf
0+Δf
1+...+Δf
n-1)/n (1)
Calculate the difference between the adjacent frequency deviation value | Δ f
i-Δ f
I-1| (difference with adjacent two frequency deviation values is that example describes here, and reality also can be two frequency deviation values poor of a plurality of frequency deviation values of being separated by), compare with mean value, when | A * Δ f
Var|＜| Δ f
i-Δ f
I-1| when (A is the constant greater than 1), | A * Δ f
Var| be default thresholding, the difference of promptly working as adjacent two frequency deviation values thinks that greater than A times of averaged frequency offset value the interior network jitter of this section period exceeds setting shake thresholding, if all frequency deviation values difference in twos is all in mean value certain multiple scope, promptly | and A * Δ f
Var|＞=| Δ f
i-Δ f
I-1|, think that shake does not exceed in network this moment to set the shake thresholding.
Step s203 dwindles the clock frequency adjusting range, reaches the adjustment PLL loop bandwidth, the purpose that PLL loop bandwidth is narrowed down.Specifically comprise: but the Synchronization Status Message SSM status word in the clock bag that server sends shows that the clock time spent of clock server (all comprises the SSM status word simultaneously in each clock bag, with clock data information, the SSM value is the state of clock bag delivery time server), dwindle the clock frequency adjusting range, reach the purpose of adjusting PLL loop bandwidth; When the SSM status word shows that the clock of clock server is unavailable, abandon described clock bag.Wherein, dwindle clock frequency and adjust the mean value of step-length less than all adjacent frequency deviation values.For example: judge in the network by a plurality of IP datagram literary compositions that to have shake, the frequency deviation value that calculates be 0.1ppm (parts permillion, 1,000,000/), the phase-locked loop state is a lock-out state simultaneously, and it is 0.01ppm that the frequency adjusting range then is set; If the phase-locked loop state is for catching state soon at this moment, it is 0.05ppm that the frequency adjusting range then is set.
For example, think that the interior network jitter of this section period exceeds setting shake thresholding, (clock that shows clock server can be used in conjunction with the SSM status word, for example, SSM is that 1 expression server is 1 grade of clock, and 2 expression servers are 2 grades of clocks, and 6 expression servers are unavailable etc. for free oscillation at this moment), revise the loop bandwidth of phase-locked loop, dwindle clock frequency and adjust step-length B * Δ f
Var(B＜1) with this filtering effect of jitter, avoids the frequency over control to produce.
Step s204 adjusts local clock according to the averaged frequency offset value, promptly according to this frequency deviation value local clock is transferred soon or is transferred slowly.When shake in the network does not exceed setting shake thresholding, the averaged frequency offset of calculating is the fixedly frequency deviation between clock server and the local crystal oscillator, and the SSM status word that sends in the clock bag shows that the clock of clock server can use, adjust the loop bandwidth of phase-locked loop this moment,, can respond clock frequency fast and change as adjusting step-length with the averaged frequency offset value that calculates.For example: frequency deviation value is 0.1ppm, just illustrates that the local clock frequency ratio is higher, and the local clock frequency is adjusted 0.1ppm downwards, if frequency deviation value be-0.05ppm, illustrate that the local clock frequency ratio is lower, the local clock frequency is adjusted upward 0.05ppm.
Certainly, before adjusting local clock, can also comprise: local clock is carried out initial calibration according to the actual frequency deviations value; Or local timer is carried out initial synchronisation calibrate.Wherein, describedly local clock is carried out initial calibration specifically comprise: by the voltage of the frequency correspondence that sets up standard, according to described driven crystal oscillator, obtain the local clock initial value, can make local clock synchronous fast, assurance equipment can use fast.Describedly local timer is carried out initial synchronisation calibration specifically comprise: by the timestamp that carries in the clock bag and the corresponding relation of local timer, adjust local timer, whether the network delay that assurance calculates because of timer hop period overshoot scope, is not convenient to detect clock server and local clock and is occurred unusually.
The embodiment of the invention also provides a kind of IP network transmission system of automatically adapting network jitter, as shown in Figure 3, comprising: server 100 is used for sending a plurality of IP datagram literary compositions to network node; Network node 200, be used to receive a plurality of IP datagram literary compositions that described server sends, judge according to described a plurality of IP datagram literary compositions whether shake exceeds setting shake thresholding, if exceeding, shake sets the shake thresholding, then dwindle the clock frequency adjusting range, reach the purpose of adjusting PLL loop bandwidth, do not set the shake thresholding, then adjust local clock according to the actual frequency deviations value if shake does not exceed.
Described network node 200 specifically comprises: receiving element 210 is used to receive a plurality of IP datagram literary compositions that described server sends; Judging unit 220 is used for judging according to described a plurality of IP datagram literary compositions whether shake exceeds setting shake thresholding; Adjustment unit 230 is used for shake and exceeds when setting the shake thresholding, dwindles the clock frequency adjusting range, reaches the purpose of adjusting PLL loop bandwidth, and shake does not exceed when setting the shake thresholding, then adjusts local clock according to the actual frequency deviations value; Wherein, adjustment unit 230 exceeds when setting the shake thresholding in shake, is further used for Synchronization Status Message SSM status word in the clock bag that server sends and shows that the clock of clock server can use, and dwindles the clock frequency adjusting range; When the SSM status word shows that the clock of clock server is unavailable, abandon described clock bag.
Described judging unit 220 specifically comprises: the frequency deviation value computation subunit, be used for according to a plurality of IP datagram literary compositions, and calculate the frequency deviation value between all adjacent a plurality of IP datagram literary compositions; The mean value calculation subelement is used to calculate the mean value of all frequency deviation values; Relatively subelement is used to calculate the difference between the adjacent frequency deviation value, compares with mean value, and when the difference between the adjacent frequency deviation value exceeded the default thresholding of described mean value, network jitter exceeded setting shake thresholding between the described adjacent frequency deviation value; When the difference between all adjacent frequency deviation values all when the default thresholding of described mean value is following, network jitter does not exceed and sets the shake thresholding between the described adjacent frequency deviation value.
In the embodiments of the invention, when the IP recovered clock,, select suitable parameters to carry out the adjustment of local clock frequency automatically, reach the purpose of clock synchronization, guarantee the rapidity of clock synchronization, also satisfy the accuracy of clock synchronization simultaneously according to the network jitter situation.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium, a computer equipment comprises some instructions so that (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
More than disclosed only be several specific embodiment of the present invention, still, the present invention is not limited thereto, any those skilled in the art can think variation all should fall into protection scope of the present invention.
Claims (11)
1. the IP network transmission method of an automatically adapting network jitter is characterized in that, may further comprise the steps:
Receive the Internet protocol IP datagram literary composition in a plurality of cycles;
Judge according to the IP datagram literary composition in described a plurality of cycles whether shake exceeds setting shake thresholding;
Set the shake thresholding if exceed, then dwindle the clock frequency adjusting range; Do not set the shake thresholding if do not exceed, then adjust local clock according to the actual frequency deviations value.
2. the IP network transmission method of automatically adapting network jitter according to claim 1 is characterized in that, described IP datagram literary composition according to described a plurality of cycles is judged whether shake exceeds and set the shake thresholding and specifically comprises:
According to the IP datagram literary composition in a plurality of cycles, calculate the frequency deviation value between all adjacent IP datagram literary compositions;
Calculate the mean value of all frequency deviation values;
Calculate the difference between the adjacent frequency deviation value, compare with mean value, when the difference between the adjacent frequency deviation value exceeded the default thresholding of described mean value, network jitter exceeded setting shake thresholding between the described adjacent frequency deviation value; When the difference between all adjacent frequency deviation values all when the default thresholding of described mean value is following, network jitter does not exceed and sets the shake thresholding between the described adjacent frequency deviation value.
3. the IP network transmission method of automatically adapting network jitter according to claim 1 is characterized in that the described clock frequency adjusting range of dwindling specifically comprises:
But the Synchronization Status Message SSM status word in the clock bag that server sends shows the clock time spent of clock server, dwindles the clock frequency adjusting range; When the SSM status word in the clock bag that server sends shows that the clock of clock server is unavailable, abandon described clock bag.
4. the IP network transmission method of automatically adapting network jitter according to claim 1 is characterized in that described adjustment PLL loop bandwidth specifically comprises:
Dwindle clock frequency and adjust the mean value of step-length less than all adjacent frequency deviation values.
5. the IP network transmission method of automatically adapting network jitter according to claim 1 is characterized in that, also comprises before adjusting local clock according to the actual frequency deviations value:
Local clock is carried out initial calibration; Or local timer is carried out initial synchronisation calibrate.
6. as the IP network transmission method of automatically adapting network jitter as described in the claim 5, it is characterized in that, describedly local clock is carried out initial calibration specifically comprise:
By the voltage of the frequency correspondence that sets up standard,, obtain the local clock initial value according to described driven crystal oscillator.
7. as the IP network transmission method of automatically adapting network jitter as described in the claim 5, it is characterized in that, describedly local timer is carried out the initial synchronisation calibration specifically comprise:
By the timestamp that carries in the clock bag and the corresponding relation of local timer, adjust local timer.
8. the IP network transmission system of an automatically adapting network jitter is characterized in that, comprising:
Server is used for sending the IP datagram literary composition to network node;
Network node, be used to receive a plurality of IP datagram literary compositions that described server sends, judge according to described a plurality of IP datagram literary compositions whether shake exceeds setting shake thresholding, if exceeding, shake sets the shake thresholding, then dwindle the clock frequency adjusting range, do not set the shake thresholding if shake does not exceed, then adjust local clock according to the actual frequency deviations value.
9. a network node is characterized in that, comprising:
Receiving element is used to receive a plurality of IP datagram literary compositions that described server sends;
Judging unit is used for judging according to described a plurality of IP datagram literary compositions whether shake exceeds setting shake thresholding;
Adjustment unit is used for shake and exceeds when setting the shake thresholding, dwindles the clock frequency adjusting range, and shake does not exceed when setting the shake thresholding, then adjusts local clock according to the actual frequency deviations value.
10. as network node as described in the claim 9, it is characterized in that described judging unit specifically comprises:
The frequency deviation value computation subunit is used for according to a plurality of IP datagram literary compositions, calculates the frequency deviation value between all adjacent IP datagram literary compositions;
The mean value calculation subelement is used to calculate the mean value of all frequency deviation values;
Relatively subelement is used to calculate the difference between the adjacent frequency deviation value, compares with mean value, and when the difference between the adjacent frequency deviation value exceeded the default thresholding of described mean value, network jitter exceeded setting shake thresholding between the described adjacent frequency deviation value; When the difference between all adjacent frequency deviation values all when the default thresholding of described mean value is following, network jitter does not exceed and sets the shake thresholding between the described adjacent frequency deviation value.
11. as network node as described in the claim 9, it is characterized in that, also comprise:
Described adjustment unit exceeds when setting the shake thresholding in shake, is further used for Synchronization Status Message SSM status word in the clock bag that server sends and shows that the clock of clock server can use, and dwindles the clock frequency adjusting range; When the SSM status word shows that the clock of clock server is unavailable, abandon described clock bag.
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6259677B1 (en) * | 1998-09-30 | 2001-07-10 | Cisco Technology, Inc. | Clock synchronization and dynamic jitter management for voice over IP and real-time data |
| US6721372B1 (en) * | 2000-03-17 | 2004-04-13 | Lucent Technologies Inc. | Intelligent software controlled correction of frequency tracking for a local oscillator of a receiver of a wireless device |
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| CN1291576C (en) * | 2003-07-29 | 2006-12-20 | 上海贝尔阿尔卡特股份有限公司 | Adaptive clock recovery method used for packet switching metwork |
| CN1859048B (en) * | 2006-01-24 | 2010-06-23 | 华为技术有限公司 | Branch circuit re-timing system |
| CN101022416B (en) * | 2007-03-06 | 2010-07-07 | 华为技术有限公司 | Method for regulating clock frequency, client and system |
-
2008
- 2008-02-01 CN CN2008100091537A patent/CN101222288B/en active Active
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