CN100466542C - Service gradation based loss distribution method - Google Patents

Service gradation based loss distribution method Download PDF

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Publication number
CN100466542C
CN100466542C CNB2006100614545A CN200610061454A CN100466542C CN 100466542 C CN100466542 C CN 100466542C CN B2006100614545 A CNB2006100614545 A CN B2006100614545A CN 200610061454 A CN200610061454 A CN 200610061454A CN 100466542 C CN100466542 C CN 100466542C
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China
Prior art keywords
grade
loss
service
performance index
business
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CNB2006100614545A
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Chinese (zh)
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CN101043369A (en
Inventor
胡士辉
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Huawei Technologies Co Ltd
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Priority to CNB2006100614545A priority Critical patent/CN100466542C/en
Priority to PCT/CN2007/001075 priority patent/WO2008003207A1/en
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Abstract

The invention provides a P2P loss allocation method based on business grade. Wherein, a P2P path may comprise one or more network segments, and the P2P performance is the sum of all edge-to- edge performance of every segment; according to business PRI, determining the edge-to-edge loss index; comparing the collected every segment index with user required total P2P index to decide whether the allocation is success. This invention ensures the business with higher PRI obtain P2P performance guarantee more easily, and improves resource utility.

Description

A kind of loss distribution method based on the grade of service
Technical field
The present invention relates to a kind of loss distribution method end to end, more particularly, relate to a kind of loss distribution method end to end based on the grade of service.
Background technology
In NGN (Next Generation Network, next generation network) network, service quality guarantees it is an important link end to end.All needing high-quality performance end to end such as application such as voice, data, fax, videos guarantees.An end-to-end path may comprise the different network network segments, how to guarantee performance end to end, and this is the individual challenging problem that has.That is to say, total losses target for an end-to-end service, how this total losses Target Assignment each network segment to its path, make each network segment realize its sub-shrink goals, thereby realize total shrink goals, guarantee service performance end to end, this is a very important research field.
Roughly have four kinds about loss distribution method end to end at present: static allocation method, pseudo-static allocation method, signaling are consulted apportion design and are gathered apportion design.Wherein close with the present invention is to gather apportion design.Below this method is simply introduced, used network topology structure is illustrated in fig. 1 shown below.There are application end to end in user A and user B, and A, B, three network segments of C are arranged on the flow path, and each network segment is an independently management domain, segment A, the direct user oriented of C.
Gathering apportion design-gather method is exactly that the loss objective while arriving on each network segment on the path is gathered, compare with the performance index end to end of customer requirements, if meet customer requirements then performance be allocated successfully, do not meet and then distribute failure.Specific practice describes in conjunction with Fig. 1 below.
At first, user A proposes service request to segment A.Here said business is meant by operator or other Internet service providers and provides that user oriented concrete network application is such as the VOIP business.Segment A is determined the performance index end to end of user A request, such as time delay according to the request of user A.Determine professional forward-path, then the network segment of other on end-to-end path B, C request performance index separately while arriving.Then, receive the index of other network segments B, C after, segment A is aggregated into index end to end with these indexs.If satisfy user's requirement, then be allocated successfully; If do not satisfy then the distribution failure.Then by routing again or and the user consult a lower method such as performance index, redistribute end to end performance index or refusal service be provided.
The above-mentioned distribution method that gathers is only distributed according to user's performance index, does not segment the grade of service, and this is inappropriate in many cases.A grade Y.1541 that a kind of business of present research is only corresponding is such as speech business correspondence grade 0 Y.1541QoS.We think also needs to segment in same business again, could satisfy actual needs.Can be subdivided into such as speech business: this locality, this Three Estate of national distance and international long-distance.
For instance, we consider two speech businesses: domestic service and international long-distance service, the performance index of the two may be the same, and so only according to performance index, why not together the network segment on the path is difficult to distinguish out the two has.But obviously the performance index of domestic service realize easily, and the performance of international long-distance service just is difficult to reach user's requirement.At this problem, the invention provides a kind of loss distribution method that segments its grade based on business more just.
Summary of the invention
Therefore, the object of the invention is to provide a kind of loss distribution method based on the grade of service.Further segment according to characteristics such as its transmission ranges for business, make and distribute higher priority business to compare to distribute that the lower business of priority is easier obtains end to end that performance guarantees, make the forward-path of different performance in the network segment be used to transmit the business of different performance needs, thereby can improve the resource utilization of the network segment, improve the ability that the network segment provides the high-quality business.Particularly, distribute priority to be meant the network segment when carrying out resource reservation,, further segment it and distribute priority, distribute the high high resource of the preferential obtained performance of stream of priority for stream with identical grade of QoS end to end.
For realizing above-mentioned goal of the invention, the invention provides a kind of loss distribution method based on the grade of service, this method comprises: the drain performance index while arriving of determining each network segment according to the priority level of business; Total performance index end to end of the drain performance index of each network segment that will gather and user's request compare, and determine whether loss distributes successful.
Preferably, the first step of said method comprises: at operation layer business is segmented grade, then professional and professional grade are mapped to the drain performance index of key-course, corresponding grade of QoS end to end and distribution priority, then QoS grade and to distribute priority mapping be forwarding grade with transport layer end to end provides the drain performance index while arriving of each network segment according to the forwarding grade.Particularly, end to end the QoS grade be meant by ITU-T (International Telecommunications Union) its recommendation Y.1541 in the definition performance rate end to end.
Further feature and advantage of the present invention will be illustrated in the back in conjunction with the accompanying drawings.
Description of drawings
Fig. 1 is a kind of simple network topology structure;
Fig. 2 is the network topology structure that includes loss distribution server of the present invention.
Fig. 3 is the flow chart of explanation loss distribution method of the present invention.
Embodiment
To specify the loss distribution method end to end based on the grade of service of the present invention below.Utilize method of the present invention, can realize that the high service feature of grade obtains preferential assurance, will be higher than the grade of domestic speech business, will preferentially guarantee the transmission performance of interlingua sound business so such as the priority of interlingua sound business.
Y.1541 defined six kinds of network QoSs (service quality) grade according to ITU-T.Wherein Class 0 (the 0th grade), the corresponding speech business of Class 1 (the 1st grade), the forwarding business that Class 5 (the 5th grade) correspondence is done one's best.Among the present invention, end to end on the basis of QoS grade, further segment its grade again at these, such as each end to end the QoS grade can be subdivided into 8 kinds and distribute priority, 48 kinds of refinements are so just arranged grade.A corresponding specific business does not need to distribute priority corresponding one by one with these 8, can be subdivided into three kinds of grades of service such as speech business: local, national distance and international long-distance, certain grade that the grade of service of these three kinds of speech businesses is corresponded to Class 0 or Class 1 respectively gets final product.We will be Y.1541 end to end the grade formed through the grade of segmentation again of QoS grade be called the grade of key-course, i.e. Ye Wu distribution priority; To be similar to those three priority of speech business, promptly application oriented priority is called the grade of application, the i.e. grade of service.In addition, also has the grade of forwarding plane, because the technology difference that the data forwarding aspect is used, the grade difference of its support, what have can support 64 kinds, and what have can support 8 kinds, so we need realize the mapping of the grade of control aspect to the grade of forwarding plane.In simple terms, for one professional end to end, we do twice mapping altogether, earlier the grade of professional application are mapped to the grade of control aspect, then the grade of control aspect are mapped to the grade of forwarding plane.Simultaneously, some business is such as speech business, and its two-way performance requirement is reciprocity, and the performance of any one direction can not get guaranteeing that business all can't provide, and in order to raise the efficiency, can consider this professional two-way performance index distribution of carrying out.When the user proposed service request, the service provider can belong to the network segment that the user inserts, and also can belong to other third party's network segment.
Particularly, be divided into 6 grades according to control aspect Y.1541, but these 6 grades are not enough in actual applications, each grade should be segmented grade again, in order to distinguish different business.Subscriber terminal equipment may be only to be concerned about concrete business, with real experiences based on service application, and be unconcerned to the concrete grade of QoS end to end and the grade of service, so there are the needs of the grade of service layer to QoS grade mapping end to end, specific implementation such as: speech business is subdivided into this locality, national distance, three kinds of business of international long-distance, these three kinds of business, be mapped as accordingly QoS grade and distribution priority end to end by service server, this mapping relations are configured according to the actual conditions of concrete business and network by the network manager.
Below in conjunction with accompanying drawing, describe loss assigning process of the present invention in detail.
As shown in Figure 3, at first, at step S1, user A proposes one by the service request (as shown in Figure 1) of user A to user B to the service provider earlier, and such as speech business, and the specified services grade is an international long-distance.If user A has the grade negotiation that the QoS ability can participate in the control aspect.
Next, for simplicity, we suppose that service handling belongs to segment A (as shown in Figure 1).At step S2, segment A is according to the business and the grade of service of user A request, determines Y.1541 the QoS grade, relevant characters (such as time delay, packet loss, shake etc.) and distribute priority end to end of control corresponding aspect.For instance, user A is to service handling server (illustrated in fig. 2) request speech business, and demonstration points out that the grade of service is international long-distance (utilizing the area code of telephone number to distinguish), the service handling server should business grade be mapped as QoSClass 0, distributing priority is 7, and provide relevant characters (IPTD＜100ms, IPDV＜50ms etc.).
Next, the loss distribution server of the present invention shown in Fig. 2 will be carried out the loss distribution.At step S3, segment A is determined forward-path, with the Y.1541 QoS grade and to distribute priority mapping be the forwarding grade of self network segment end to end of request, determine corresponding while arriving the forwarding performance (time delay, packet loss, shake etc.) of (promptly from entry gateway to exporting gateway).Network segment inner edge records by test macro to the performance on limit.To the limit, owing to have different forward-paths and different forwarding grades, may have multiple forwarding performance on a limit, this is recorded by test macro.After Y.1541 QoS grade and grade are mapped as corresponding forwarding grade end to end, can obtain its forwarding performance while arriving.
Then, the next network segment on the path sends the service feature request for allocation, the message of request comprises: the performance index while arriving that the distribution priority of the grade of QoS end to end of overall performance index, correspondence and control aspect, and adding segment A self has end to end been distributed.Notice that the distribution priority of considering two network segments may not be corresponding one by one, need do suitable conversion according to configuring negotiation.Such as the distribution priority of the toll service correspondence of the network segment 1 for qos class 0 y.1541, distribute priority 7, and the distribution priority of the network segment 2 toll service correspondences for qos class 0 y.1541, distribute priority 3, the network segment 1 is when the network segment 2 sends request like this, will do corresponding mapping, this mapping ruler is that the keeper by two network segments consults appointment.
Then, at step S4, the network segment on the path, be that network segment B in the present embodiment is equally according to Y.1541 the QoS grade and the corresponding distribution priority end to end of request, map out the forwarding grade of self network segment, determine that then this transmits the performance index while arriving of grade, this limit joined request message to the performance index on limit, then request message is sent to the next network segment.
Next, at step S5, network segment C provides self corresponding performance while arriving of transmitting grade equally.Network segment C determines oneself be last network segment on the path, gathers the performance index that each network segment provided on the path, sees whether to satisfy total performance index end to end, is allocated successfully as if satisfied then loss end to end.By the opposite direction of network segment C along the path, send resource reservation request message, the business of considering is a bi-directional symmetrical, can apply for two-way loss distribution and resource reservation simultaneously, be that each network segment carries out reverse loss distribution application when the loss of carrying out forward distributes application, thereby can guarantee the needs two-way and the business resource equity that require as speech business.In addition, also can in the loss request for allocation, carry out resource reservation.
At step S6, judge that loss distributes the performance index of whether satisfying the demand.If loss is allocated successfully, then at step S7, does the resource reservation application, and carry the message that loss is allocated successfully along the opposite direction in path.Like this, segment A is received reciprocal resource reservation request, after the affirmation loss is allocated successfully, sends successful acknowledge message to user A.
If loss distributes failure, at step S8, the performance index while arriving that network segment C distributes failed message, each network segment to provide loss feed back to promoter's segment A of request in the lump.
Segment A is handled and is distributed failure that dual mode is arranged:
A) performance while arriving that provides with reference to each network segment, rerouting is initiated the loss request for allocation again.
B), consult comparatively loose performance index with the user if user A has the QoS ability.Further, if require the performance index of professional message length to satisfy, such as the transmission shake, but the performance index of other message lengths can satisfy, the service provider can also and transmission parameter such as user's negotiation packet length.
This shows, by business being subdivided into the different grades of service, carrying out loss based on this grade of service distributes, the easier performance that obtains end to end of the higher business of the grade of service is guaranteed, make the forward-path of different performance in the network segment be used to transmit the business of different performance needs, thereby can improve the resource utilization of the network segment, improve the ability that the network segment provides the high-quality business.

Claims (4)

1, a kind of loss distribution method end to end based on the grade of service, it is characterized in that, may further comprise the steps: business is segmented grade at operation layer, then professional and professional grade are mapped to the drain performance index of key-course, corresponding grade of QoS end to end and distribution priority, then QoS grade and to distribute priority mapping be forwarding grade with transport layer end to end provides the drain performance index while arriving of each network segment according to the forwarding grade; Total performance index end to end of the drain performance index of each network segment that will gather and user's request compare, and determine whether loss distributes successful.
2, according to the loss distribution method of claim 1, it is characterized in that: comprise that also carrying out two-way loss simultaneously distributes, promptly the network segment on the path is carrying out applying for simultaneously when forward loss is distributed application that reverse loss distributes.
3, according to the loss distribution method of claim 1, it is characterized in that: comprise that also service handling side and user consult performance index again when the loss distribution is unsuccessful.
4, according to the loss distribution method of claim 1, it is characterized in that: the drain performance index while arriving that provides with reference to each network segment when the loss distribution is unsuccessful also is provided, rerouting also carries out loss again and distributes.
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