CN100488194C - Method of adjusting time delay in reversal multiplexing protocol of asynchronous transmission mode - Google Patents
Method of adjusting time delay in reversal multiplexing protocol of asynchronous transmission mode Download PDFInfo
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- CN100488194C CN100488194C CNB2003101193408A CN200310119340A CN100488194C CN 100488194 C CN100488194 C CN 100488194C CN B2003101193408 A CNB2003101193408 A CN B2003101193408A CN 200310119340 A CN200310119340 A CN 200310119340A CN 100488194 C CN100488194 C CN 100488194C
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Abstract
Based on maximal bandwidth of IMA, the method ensures to select optimal quick chain so as to guarantee transmission efficiency. When memory of IMA group is in LODS, the method includes following steps: (1) according to DCB depth, sorting normal chain in group and LODS chain from large to small forms ordered set; (2) setting up width of delayed sliding window being as maximal operation delay; (3) according to order from large to small, using delayed sliding window traverses ordered set, then selecting one subset with maximal number of chains, eliminating the chains not contained in the subset out of the group; (4) eliminating faulty conditions of all LODS chain from group.
Description
Technical field
The present invention relates to asynchronous transfer mode inverse multiplexing agreement, particularly the optimization method in the asynchronous transfer mode inverse multiplexing agreement.
Background technology
Along with society constantly develops, the network service is variation constantly, people are more and more higher to the requirement of network, the manufacturer begins to consider and studies and how these are realized by a unified multi-media network the network service that bandwidth, real-time, transmission quality requirements have nothing in common with each other, accomplishes real Integrated Service Digital Network.Asynchronous transfer mode (Asynchronous Transfer Mode is called for short " ATM ") net arises at the historic moment thus.ATM is an advanced person and the practical communication technology, and it adopts the packet of fixed size dynamically to distribute bandwidth, and the compression of data, coding and transmission are asynchronous carrying out.ATM is also referred to as " rapid message grouping ", and transfer rate can reach 625Mbps at present, and it will be one of main implementation technique of following Internet backbone network.
Inverse Multiplexing over ATM (Inverse Multiplexing for ATM, be called for short " IMA ") technology an atm cell stream based on cell, inverse multiplexing transmits on a plurality of physical connections, and at far-end these cell flows that transmit on different physical links is reverted to single cell flow.The practical approach of this support high-speed atm cell flow has been created condition for media user inserts and utilize existing link to carry out the ATM transmission.This thought has begun to be widely used, especially under the heavier situation of network load, the business that flow is bigger is distributed in many network routes and bears, and not only can alleviate the traffic load of the heavily loaded route of part in the network, has also improved utilization rate of network resource simultaneously.
In actual applications,, often surpass the speed of a physical link, need tie up one or more physical link with ima protocol and form an IMA group, on existing physical link, carry ATM cell because the physical link speed of an ATM is higher.When using IMA to organize to carry ATM professional, because the transmission network of each bar link process may be different in the group, the transmission delay of link may be different, therefore exist transmission delay poor between link.Used the cell caching technology to solve this problem in the ima protocol.
The recovery technology of cell buffer memory in the ima protocol is described below with reference to Fig. 1.The IMA group has a public read pointer, and each bar link has the write pointer of oneself, and oneself independently spatial cache being arranged--compensation of delay buffer memory (Delay Compensate Buffer is called for short " DCB "), the time-delay difference that can tolerate according to the IMA group is provided with.Need to prove, be zero point with the read pointer of organizing, and the write pointer of link is before the read pointer of group, then the DCB degree of depth of this link be on the occasion of, the write pointer of link is after the read pointer of group, and then the DCB degree of depth of this link is a negative value, and the DCB degree of depth is a unit with the cell number.ICP1 in the link, ICP2, ICP3 are the control cells, are used for the beginning and the end of identification frames.The read pointer rate travel of IMA group is by the decision of IMA cell of data speed, and the write pointer rate travel of link is by the cell arrival rate decision of link self.When the inconsistent and speed that cause cell to arrive of the delay value of each bar link in the group was inconsistent, the skew between the read pointer that the write pointer of each bar link and IMA organize was also different.At buffer area with regard to showing the little link of time-delay because the speed that cell arrives is fast buffer memory more cell, the many link of time-delay then buffer memory less cell.
The excessive write pointer that causes the read pointer organized above link of certain bar link time-delay in group, perhaps link seems too fast for reference link, thereby the write pointer that causes link exceeds the buffer area space of link, all can cause losing of cell under the both of these case, therefore in agreement, introduced link time-delay out-of-frame defect (Link Out of Delay Synchronization, be called for short " LODS "), guarantee that professional cell do not lose.In agreement realizes; minimum and ultimate range between the read-write pointer have been set; with the cell is unit, and minimum range is called the protection bandwidth time-delay (Guardband Delay) of group, and ultimate range is called the maximum operation delay (Max Operational Delay) of group.When the write pointer of arbitrary link is too delayed time less than the protection bandwidth near the distance between read pointer of organizing and the read-write pointer in organizing; this link produces the LODS defective; this link is changed to unavailable, this link just no longer is used for the transport service cell and disappears up to the LODS defective.When the write pointer of arbitrary link in the group away from the read pointer of group and the distance of read-write between the pointer during greater than the maximum operation delay organized, this link produces the LODS defective equally and is changed to this link unavailable.
Ima protocol has defined a kind of method; when link has the LODS defective; distance between the read pointer of the write pointer of link and link is positioned within the scope of permission; satisfy simultaneously greater than the time-delay of protection bandwidth with less than two conditions of maximum operation delay; to eliminate the LODS defective of link, it is available that this link is continued.
In actual applications, there is following problem in such scheme: just eliminate the LODS defective on the link, the IMA group can be worked on.But this scheme does not guarantee maximum bandwidth and high-transmission efficient in fact, only is to make the IMA group continue available.
Cause the main cause of this situation to be, the LODS method of adjustment that the such scheme neither one is complete is adjusted the Link State in the IMA group, so in case the LODS defective appears in link, can only be changed to this link unavailable, thereby can't reach maximum bandwidth and peak efficiency.
Summary of the invention
The technical problem to be solved in the present invention provides time-delay regulating method in a kind of asynchronous transfer mode inverse multiplexing agreement, makes the preferential rapid link of selecting on the basis that guarantees the IMA maximum bandwidth to have guaranteed efficiency of transmission.
In order to solve the problems of the technologies described above, the invention provides time-delay regulating method in a kind of asynchronous transfer mode inverse multiplexing agreement, when having link time-delay out-of-frame defect in the asynchronous transfer mode inverse multiplexing agreement group, comprise following steps:
A is formed with ordered sets to normal link in described group and link time-delay out-of-frame defect link according to the descending ordering of the compensation of delay buffer area degree of depth;
It is described group maximum operation delay that B is provided with time-delay sliding window width;
C uses described time-delay sliding window to travel through described ordered set according to from big to small order, chooses a subclass that the link number is maximum, and the link that does not comprise in this subclass is rejected from described group;
When D remains near described group the protection bandwidth when the compensation of delay buffer memory degree of depth between the write pointer of described group read pointer and the time-delay of the minimum in described time-delay sliding window link, remove described group in the defect state of all links time-delay out-of-frame defect links.
Wherein, before described steps A, periodically whether exist link time-delay out-of-frame defect to inquire about to the link in the described asynchronous transfer mode inverse multiplexing agreement group.
Described step C also comprises following substep:
Judge whether the described subclass that exists a plurality of link numbers maximum, if then choose a described subclass that wherein traverses at first.
Described step D also comprises following substep:
In the maximum subclass of the described link number of choosing, obtain the compensation of delay buffer area degree of depth minimum in each link;
The compensation of delay buffer area degree of depth of described minimum is deducted described group protection bandwidth, obtain the time-delay adjusted value;
Adjust described group read pointer according to described time-delay adjusted value.
The present invention also provides time-delay regulating method in a kind of asynchronous transfer mode inverse multiplexing agreement, when not having link time-delay out-of-frame defect in the asynchronous transfer mode inverse multiplexing agreement group, comprises following steps:
Obtain described group of current minimum time-delay and the time-delay of protection bandwidth;
Whether the minimum compensation of delay buffer area degree of depth of judging described group is greater than time-delay of protection bandwidth and optimization thresholding sum, if then reduce described group time-delay.
Wherein, described described group the delay value that will reduce is that current minimum delay value in described group deducts the difference that described group protection bandwidth delay value obtains.
By relatively finding, technical scheme difference with the prior art of the present invention is, when the LODS defective appears in link in the IMA group, technical scheme of the present invention is by the slip of an IMA group time-delay sliding window, on the basis that guarantees the IMA maximum bandwidth, preferentially adjust rapid link to raise the efficiency.
When the LODS defective does not appear in link in the IMA group, by reducing the time-delay of IMA group, just dwindle the distance between the read-write pointer as far as possible, guarantee professional timely transmission.
At deficiency of the prior art, technical scheme of the present invention can guarantee that the link number that normally transmits in the IMA group reaches maximum by the state that changes link, thereby the acquisition maximum bandwidth is considered the influence of link-speeds speed again on the basis of maximum bandwidth.
Difference on this technical scheme has brought comparatively significantly beneficial effect, and promptly when the LODS defective appearred in link in the group, the normal, chain way had guaranteed the maximum bandwidth of group greater than LODS chain of defects way in the IMA group; And when LODS chain of defects way was the same with the normal, chain way in the group, the preferential little link of time-delay of adjusting guaranteed the rapid link operate as normal; In group, do not have under the situation of LODS defective link, the time-delay of the minimum of group is adjusted near the protection bandwidth time-delay of group, make the time-delay minimum of group.
In practice, the transmission link bandwidth of communication system is that the user is concerned about the most, and is also important in the timely transmission that guarantees transport service.Technical scheme of the present invention has improved efficiency of transmission by the preferential method of adjusting rapid link on the basis that guarantees the IMA maximum bandwidth, helps application and the popularization better of IMA technology.
Description of drawings
Fig. 1 is the schematic diagram of cell caching technology in the existing ima protocol;
Fig. 2 is that IMA organizes time-delay sliding window schematic diagram according to an embodiment of the invention;
Fig. 3 be according to an embodiment of the invention in the ima protocol when link has the LODS defective, the method flow diagram that time-delay is adjusted;
Fig. 4 be according to an embodiment of the invention in the ima protocol when link does not have the LODS defective, delay Optimization is adjusted flow chart.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.
Generally speaking, the present invention relates to two aspects: the first, there is the method for adjustment under the LODS defective in link in the group; The second, the delay Optimization method of adjustment in the group under the no LODS defective link.To describe respectively with the method for adjustment under two kinds of situations below.
When the LODS defective appears in link in the IMA group, need adjust the read pointer of group and the distance between the link write pointer by the read pointer position of moving group, eliminate the LODS defective of link as far as possible.In technical scheme of the present invention; the link that the DCB degree of depth surpasses maximum operation delay is called rapid link; the DCB degree of depth is called slow speed link less than the link of protection bandwidth time-delay, and the DCB degree of depth is called normal link in the protection bandwidth of group and the link between the maximum operation delay.Because it is total that the read pointer in the group is all links, therefore in the process of adjusting read pointer, must cause the variation of distance between the read pointer of the write pointer of original normal link and group, even cause the distance between them to surpass thresholding and the LODS defective occurs, therefore in the process of adjusting, on the basis of maximum bandwidth, preferentially adjust rapid link, give up slow speed link.
There is the method for adjustment under the LODS defective in link in the IMA group, is based on that an IMA group time-delay sliding window carries out.The roughly implication of this method of adjustment is described: among the link buffer area A below with reference to Fig. 2, normal and have the link of LODS defective to arrange from big to small according to the DCB degree of depth of link self, the time-delay sliding window is that window size begins to slide from a at link buffer area A with the maximum bandwidth of operation of group, glide direction as shown in FIG., dropping on link set maximum in the sliding window needs to guarantee normal link exactly.
The method flow that time-delay is adjusted is described according to an embodiment of the invention in the ima protocol when link has the LODS defective below with reference to Fig. 3:
At first, in step 110, system carries out cyclic polling to the link defective in organizing, and the big I in cycle is decided according to actual real needs.Cycle is excessive, can make not adjust in time when the link defective takes place, and causes entire I MA group unavailable; Cycle is too small, inquires about too frequently, also can reduce system effectiveness.
After this execution in step 120, judge whether there is the LODS defective in the system according to the Query Result of previous step, if exist, then trigger the LODS method of adjustment, execution in step 130; If do not exist, then return initial condition, behind one-period, continue step 110 and inquire about.
In step 130, obtain all normal link and the delay value that the link of LODS defective is arranged in the group, and be formed with ordered sets A according to the descending ordering of the DCB degree of depth, and execution in step 140.This step is for the foundation of selection is provided to the sliding window in the following step.Need to prove, the time-delay of link is to weigh with the number of buffer memory cell, because when the read pointer distance of write pointer in a certain link and this IMA group is excessive, must there be a large amount of cells in the buffer memory of this link, thereby cause the generation of delaying time, if this time-delay is big when surpassing the maximum operation delay of organizing, this link just produces the LODS defective and transfers down state to.
Then execution in step 140 is provided with time-delay sliding window width and is the maximum operation delay in the group, and execution in step 150 then.In fact, maximum operation delay correspondence is exactly the maximum number of a patient buffer memory cell of link.Because the transmission of each cell will expend certain hour, this time be multiply by the maximum number of buffer memory cell so, and what obtain is exactly the patient maximum delay of this link.The cell of each bar link buffer memory is different, thereby the time-delay that shows is also just different.For example, have that cell sends very soon on the link, it is relatively slow that other link sends, because the IMA group is that multilink is finished transformation task jointly, the recipient periodically receives cell in the group, therefore, the too fast meeting of the transmission of a link causes the disorder of sequence, must carry out buffer memory to cell according to fast link.So the cell of buffer memory is more on the fast link, time-delay is also just bigger, therefore is necessary to be provided with a thresholding, is exactly the maximum operation delay in the group.
In step 150, sliding window travels through this set from big to small according to ordered set A, chooses the maximum link set B of link number that drops in the window, if there is the same number of subclass of a plurality of links, then choose first subclass as subclass B, execution in step 160 then.Sliding window slides to the time-delay sequence of link in the IMA group according to order from big to small, and its essence makes DCB degree of depth difference exactly in a definite scope.The size of window is certain, and along with moving of window, the link number in the window is changing, and can find maximum one group or several groups of link.Because the delay inequality between each bar link is uneven, so some local intensive some place is sparse, and the number of links that place, window place can comprise is exactly the number of links within the current delay allowed band.So the link that window comprises is many more, the bandwidth of system is also just big more.When the same number of subclass of a plurality of links, the link in the set of foremost belongs to rapid link because the DCB degree of depth is bigger, and therefore for the preferential rapid link operate as normal that guarantees, the link in this set needs to guarantee normal link exactly.
After this execution in step 160, calculate the time-delay adjusted value of IMA group.The link of DCB degree of depth minimum in the selected window, the difference of the DCB degree of depth of this link and the time-delay of the protection bandwidth of group is exactly the time-delay adjusted value of the read pointer of group, and execution in step 170 then.
In step 170; make the read pointer of this group and the DCB degree of depth between the write pointer between the time-delay of the minimum in the selected window link remain near the protection bandwidth of group according to the read pointer of this adjusted value adjustment group; eliminate the LODS defective of the link in this selected window then, this flow process finishes.But because this method of adjustment is cycling service from start to finish in the IMA group, therefore behind the certain hour of interval, system will call the method for adjustment in this programme once more.
When the LODS defective did not appear in link in the IMA group, the distance of as far as possible dwindling between the read-write pointer can realize minimizing IMA group time-delay.The time-delay that produces in the IMA transmission link mainly shows on the buffer memory to ATM cell, therefore reduces time-delay and can guarantee professional timely transmission.
Illustrate according to an embodiment of the invention in the ima protocol that below with reference to Fig. 4 when link did not have the LODS defective, delay Optimization was adjusted flow process:
At first in step 210, obtain current group minimum time-delay and the time-delay of protection bandwidth, execution in step 220 then.
In step 220, judge in the IMA group the minimum DCB degree of depth whether greater than the time-delay of protection bandwidth with optimize the thresholding sum, if judge and be then execution in step 230, if not, then do not need to adjust, this flow process finishes.Here introduce optimizing thresholding, is in order to prevent near the time-delay size is in protection bandwidth delay value, frequently adjusts that optimize can the reduction system effectiveness.Optimize the size of threshold value, can be according to the requirement of time-delay be set, in case after setting, in service in system, this thresholding occurs as fixed value before system start-up.
After this execution in step 230, and the IMA group time-delay that needs are reduced is adjusted into the protection bandwidth delay value that minimum delay value in current group deducts group, and this flow process finishes.Concrete method of adjustment is to read data in buffer among the DCB fast by the read pointer that IMA organizes, and equals to protect the pairing BCD degree of depth of bandwidth delay value until the minimum BCD degree of depth.
By above two kinds of adjustment schemes, when the LODS defective does not appear in link in the IMA group, near technical scheme of the present invention is delayed time by the protection bandwidth of the time-delay of the minimum of group being adjusted to group, make the time-delay minimum of group, to ensure professional timely transmission.And when the LODS defective takes place in the link, can obtain maximum bandwidth by the state that changes link, can be adjusted into normal link to the link that the LODS defective was arranged originally, and make the normal link LODS defective that become.Concrete adjustment effect can be with following bright for instance.For example, just often, in certain IMA group 5 links are arranged, certain constantly wherein two links the LODS defective takes place owing to transmission speed is too fast, system can think that in order to guarantee the normal transmission of rapid link these two links are normal, and other 3 links are thought to have the LODS defective, they are changed to down state, so have only two links in transmission in the IMA group; In this case, technical scheme of the present invention is in order to guarantee maximum bandwidth, can manage those 3 links are adjusted to normal range (NR), time-delay between 2 fireballing links of in addition that and this 3 links will surpass thresholding, thereby the LODS defective takes place in those 2 links, 3 links are just arranged like this in transmission in the system, than having howed a link before adjusting in work, natural energy obtains bigger bandwidth.Need to prove that what technical scheme of the present invention was pursued is maximum bandwidth, this is because in actual applications, it the most people pay close attention to.
Though by reference some preferred embodiment of the present invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that, can do various changes to it in the form and details, and the spirit and scope of the present invention that do not depart from appended claims and limited.
Claims (6)
1. time-delay regulating method in the asynchronous transfer mode inverse multiplexing agreement is characterized in that, when having link time-delay out-of-frame defect in the asynchronous transfer mode inverse multiplexing agreement group, comprises following steps:
A is formed with ordered sets to normal link in described group and link time-delay out-of-frame defect link according to the descending ordering of the compensation of delay buffer area degree of depth;
It is described group maximum operation delay that B is provided with time-delay sliding window width;
C uses described time-delay sliding window to travel through described ordered set according to from big to small order, chooses a subclass that the link number is maximum, and the link that does not comprise in this subclass is rejected from described group;
When D remains near described group the protection bandwidth when the compensation of delay buffer memory degree of depth between the write pointer of described group read pointer and the time-delay of the minimum in described time-delay sliding window link, remove described group in the defect state of all links time-delay out-of-frame defect links.
2. time-delay regulating method in the asynchronous transfer mode inverse multiplexing agreement according to claim 1, it is characterized in that, before described steps A, periodically whether exist link time-delay out-of-frame defect to inquire about to the link in the described asynchronous transfer mode inverse multiplexing agreement group.
3. time-delay regulating method in the asynchronous transfer mode inverse multiplexing agreement according to claim 1 is characterized in that, described step C also comprises following substep:
Judge whether the described subclass that exists a plurality of link numbers maximum, if then choose a described subclass that wherein traverses at first.
4. time-delay regulating method in the asynchronous transfer mode inverse multiplexing agreement according to claim 1 is characterized in that, described step D also comprises following substep:
In the maximum subclass of the described link number of choosing, obtain the compensation of delay buffer area degree of depth minimum in each link;
The compensation of delay buffer area degree of depth of described minimum is deducted described group protection bandwidth, obtain the time-delay adjusted value;
Adjust described group read pointer according to described time-delay adjusted value.
5. time-delay regulating method in the asynchronous transfer mode inverse multiplexing agreement is characterized in that, when not having link time-delay out-of-frame defect in the asynchronous transfer mode inverse multiplexing agreement group, comprises following steps:
Obtain described group of current minimum time-delay and the time-delay of protection bandwidth;
Whether the minimum compensation of delay buffer area degree of depth of judging described group is greater than time-delay of protection bandwidth and optimization thresholding sum, if then reduce described group time-delay.
6. time-delay regulating method in the asynchronous transfer mode inverse multiplexing agreement according to claim 5; it is characterized in that described described group the delay value that will reduce is that current minimum delay value in described group deducts the difference that described group protection bandwidth delay value obtains.
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| CNB2003101193408A CN100488194C (en) | 2003-12-10 | 2003-12-10 | Method of adjusting time delay in reversal multiplexing protocol of asynchronous transmission mode |
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| CNB2003101193408A CN100488194C (en) | 2003-12-10 | 2003-12-10 | Method of adjusting time delay in reversal multiplexing protocol of asynchronous transmission mode |
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| CN101765220B (en) * | 2008-12-25 | 2012-02-29 | 中兴通讯股份有限公司 | Data acquisition method based on asynchronous transfer mode inverse multiplexing agreement |
| CN101854655B (en) * | 2009-04-03 | 2012-09-05 | 大唐移动通信设备有限公司 | Method of loopback fault positioning of IMA link and loopback fault handling device |
| CN109327716B (en) | 2018-10-31 | 2020-09-11 | 北京达佳互联信息技术有限公司 | Delay control method, delay control apparatus, and computer-readable storage medium |
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