CN1494265A

CN1494265A - Logic multisection environment protective method based on different priority grade

Info

Publication number: CN1494265A
Application number: CNA021377952A
Authority: CN
Inventors: 芳姚; 姚芳; 杨军; 孙德胜
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2002-10-31
Filing date: 2002-10-31
Publication date: 2004-05-05
Anticipated expiration: 2022-10-31
Also published as: CN100433670C

Abstract

The invented method discloses allocation plan for shared bandwidth when service priority is different. Realizing steps are as following: determining shared bandwidth of multiple logic multiplexing section loops, determining priority of each logic multiplexing section loop, allocating shared bandwidth, allocating part of bandwidth as shared protective bandwidth and other part as working bandwidth of each logic multiplexing section. Each multiplexing logic section is independent operated independently. When multiple logic multiplexing section loops apply to use shared protective bandwidth, the protective bandwidth is allocated to the logic multiplexing section loop with highest priority. Logic multiplexing section loops with lower priorities are treated as protection failure of overcrossing sections. Bandwidth at logic protection port should guarantees sufficient bandwidth when rearrangement happens. Service priority of each logic multiplexing section loop can be setup freely.

Description

A kind of logic multiplexing section loop guard method based on different priority levels

Technical field

The present invention relates to SDH (Synchronous Digital Hierarchy) (SDH:Synchronous Digital Hierarchy)/Synchronous Optical Network (SONET:Synchronous Optical Network) optical transmission; more particularly, relate to a kind of logic multiplexing section loop guard method based on different priority levels.

Background technology

No matter in the extensive use of SDH/SONET equipment, its networking mode is also increasingly sophisticated, and the multiplex section ring is crossing, tangent, the situation of common optical fiber is more and more, but the networking what state, all is primary demand to effective protection of business.The ITU-T of International Telecommunication Association (branch of the relevant telecommunication standard of InternationalTelecommunication Union Telecommunication Standardization Sector International Telecommunications Union) G.841 number suggestion " type and the characteristic of SDH network protection architecture " has been made concrete suggestion to the APS function of SDH network.But this standard is the automatic protection algorithm at the K1/K2 proposition of standard.Under the situation of a plurality of ring common optical fiber, that is to say that a plurality of rings have only distributed under the situation of same group of K1/K2, traditional multiplex section protection mode can't realize a plurality of multiplex section rings.

Lucent (Lucent Technologies Inc) has proposed the notion of empty ring (Virtual Rings) in 1998; and apply for a patent: empty ring self-healing network (SELF HEALING NETWORKS USINGVIRTUAL RINGS); propose in the literary composition to utilize idle overhead to transmit the K byte information; each empty ring can both obtain corresponding K byte information; thereby a multiplex section ring physically can be divided into a plurality of void rings in logic, and each empty ring can both be realized defencive function respectively.For example: under the situation of two ring common optical fiber, adopt this method can form two empty rings, thereby the business that disposes on two rings can be protected.But not mentioned concrete implementation in this patent, and consideration realizes protection when how two ring service priority do not make full use of shared bandwidth simultaneously, and how shared bandwidth distributes just calculation fair.

Summary of the invention

Of the present inventionly be to provide a kind of logic multiplexing section loop guard method, promptly provide a kind of in the service priority allocative decision of shared bandwidth simultaneously not based on different priority levels.

For achieving the above object, main performing step is as follows:

A. determine the shared bandwidth of a plurality of logic multiplexing section loops;

B. determine the priority of each logic multiplexing section loop;

C. common bandwidth is assigned as each logical multiplexing section bandwidth of operation and shared protection bandwidth.

D. when a plurality of logic multiplexing section loops all applied for using shared protection bandwidth, this protection bandwidth was distributed to the highest logic multiplexing section loop of priority and is used, and the logic multiplexing section loop that priority is lower is striden the segment protect crash handling according to this.

Described logic protection port bandwidth should guarantee enough bandwidth are arranged for its use when other sections of striding of logic multiplexing section loop are switched.

The size of the bandwidth of the working port of each logical multiplexing section described in the step C is non-homogeneous distribution under situation about allowing.

The service priority of each logic multiplexing section loop can be established described in step B and the step D.

Among the step D, when the priority level of logic multiplexing section loop is identical, can split into a plurality of logic protection port bandwidth to common protection bandwidth, during the section of the striding application simultaneously of each logical multiplexing section, utilize the logic protection port bandwidth of oneself separately.

Among the step D, when the shared section of striding of a certain logic multiplexing section loop produced switching request, each logic multiplexing section loop was used the protection routing restoration business of oneself respectively.

Description of drawings

Below in conjunction with the drawings and specific embodiments the present invention is done detailed elaboration, wherein:

Fig. 1 is a logic multiplexing section loop typical case networking diagram;

The allocated bandwidth figure of common port when Fig. 2 is two logic multiplexing section loop common port, wherein (a) is general fashion allocated bandwidth figure, is based on priority mode allocated bandwidth figure (b);

Fig. 3 is that logic multiplexing section loop 1 produces the multiplex section rearrangement request;

Fig. 4 is that logic multiplexing section loop 2 produces the multiplex section rearrangement request;

Fig. 5 is that two logic multiplexing section loops all produce the multiplex section rearrangement request;

Fig. 6 is that two public sections of striding of logic multiplexing section loop produce the multiplex section rearrangement request.

Embodiment

Be that example illustrates this guard method with two shared bandwidth of logic multiplexing section loop below.

Referring to Fig. 1, shown in the networking topological diagram, network element A (101), B (102), C (103), D (104) form two phase cross rings, the stride sections of two rings between shared network element B (102), the C (103).Logically the section of striding between B (102), the C (103) is split as two logic sections of striding, belongs to the logic multiplexing section loop 2 (112) that logic multiplexing section loop 1 (111) that network element A (101), B (102), C (103) form and network element B (102), C (103), D (104) form.

The section of striding between network element B (102), the C (103) belongs to the shared section of striding of two logic multiplexing section loops, this section of striding bandwidth is distributed jointly by two logic multiplexing section loops, logically the section of striding between B (102), the C (103) is split as two logic sections of striding, belongs to the logic multiplexing section loop 2 (112) that logic multiplexing section loop 1 (111) that network element A (101), B (102), C (103) form and network element B (102), C (103), D (104) form.Each logic section of striding is made up of service aisle section of striding and the protection passage section of striding.Words specific to network element B (102), C (103) port; the port that network element B (102), C (103) link to each other can split into logic port 1, logic port 2; comprise logic working port, logic protection port in each logic port again, each logic working/protection port all expends certain bandwidth.

Referring to Fig. 2; the employed bandwidth of port that network element B (102) links to each other with network element C (103) can split into logical one working port bandwidth W1 (105), logical one protection port bandwidth P1 (106), logic 2 working port bandwidth W2 (107), logic 2 protection port bandwidth P2 (108) four parts, and the bandwidth summation that W1, P1, W2, P2 four parts expend is fixed.P1 (106) is subjected to the restriction of the bandwidth of operation of logic multiplexing section loop 2 sections of striding, and must guarantee has enough bandwidth for its use when logic multiplexing section loop 2 sections of striding are switched; P2 (107) is subjected to the restriction of the bandwidth of operation of logic multiplexing section loop 1 section of striding, and must guarantee has enough bandwidth for its use when logic multiplexing section loop 1 section of striding is switched.The size of W1 (105)/W2 (107) can freely be distributed under situation about allowing, and the general method of salary distribution is shown in Fig. 2 (a).Logical multiplexing section 1 is different with the service priority of logic multiplexing section loop 2; under the situation that the service aisle bandwidth must guarantee again; the method of salary distribution that adopts can develop into the method for salary distribution shown in Fig. 2 (b); when guaranteeing W1 (105), W2 (107); P1 (106) and P2 (108) are combined into P (109), as the shared protection passage of logic multiplexing section loop 1 (111) and logic multiplexing section loop 2 (112).Logic multiplexing section loop 1 (111) can be established with the service priority of logic multiplexing section loop 2 (112); when two logic multiplexing section loops all need use protection passage P (109); this protection passage is used by the high logic multiplexing section loop of priority, and the priority of setting logic multiplexing section loop 1 (111) herein is higher than the priority of logic multiplexing section loop 2 (112).

Referring to Fig. 3; after A (101), B (102) section of striding produce switching request in the logic multiplexing section loop 1 (111); A (101), B (102) stride the protection routing restoration business that section business utilizes B (102), C (103) section of striding; that is to say that this moment, the shared protection bandwidth of common port was distributed to logic multiplexing section loop 1 use.

Referring to Fig. 4; after B (102), D (104) section of striding produce switching request in the logic multiplexing section loop 2 (112); B (102), D (104) stride the protection routing restoration business that section business utilizes B (102), C (103) section of striding; that is to say that this moment, the shared protection bandwidth of common port was distributed to logic multiplexing section loop 2 uses.

Referring to Fig. 5; after B (102), D (104) section of striding all produce switching request in A (101), B (102) section of striding generation switching request and the logic multiplexing section loop 2 (112) in the logic multiplexing section loop 1 (111); higher because of setting logic multiplexing section loop 1 (111) priority, A (101), B (102) stride the protection routing restoration business that section business utilizes B (102), C (103) section of striding.B (102), D (104) stride section business and do not switch, and that is to say, the shared protection bandwidth of common port is distributed to logic multiplexing section loop 1 use of high priority at this moment, and logic multiplexing section loop 2 is handled according to this shared weak point protection channel failure of striding.

Referring to Fig. 6; after B (102), C (103) section of striding produce switching request in the logic multiplexing section loop 2 (112); the business of logic multiplexing section loop 1 (111) and the business of logic multiplexing section loop 2 (112) are utilized the protection routing restoration business of logic multiplexing section loop separately respectively in B (102), C (103) section of striding; at this moment; the shared protection passage of common port was not both used by logic multiplexing section loop 1, was not used by logic multiplexing section loop 2 yet.

When two logic multiplexing section loop priority are identical, and produce the multiplex section rearrangement request simultaneously, then directly can use virtual protection bandwidth separately separately.

In sum, when the shared same multiplex section of different logic multiplexing section loops, can more optimally utilize shared multiplex section bandwidth based on the method for salary distribution of priority, the business of high priority also can obtain better protection.

Claims

1. logic multiplexing section loop guard method based on different priority levels, this method provide the not allocative decision of shared bandwidth simultaneously of service priority, and the specific implementation step of this method is as follows:

B. determine the priority of each logic multiplexing section loop;

C. common bandwidth is assigned as each logical multiplexing section bandwidth of operation and shared protection bandwidth;

2. the method described in claim 1 is characterized in that, described logic protection port bandwidth should guarantee enough bandwidth are arranged for its use when other sections of striding of logic multiplexing section loop are switched.

3. the method described in claim 1 is characterized in that, the size of the bandwidth of the working port of each logical multiplexing section described in the step C is non-homogeneous distribution under situation about allowing.

4. the method described in claim 1 is characterized in that, the service priority of each logic multiplexing section loop is freely to set described in step B and the step D.

5. the method described in claim 1; it is characterized in that; among the step D; when the priority level of logic multiplexing section loop is identical; common protection bandwidth is split into a plurality of logic protection port bandwidth; during the section of the striding application simultaneously of each logical multiplexing section, utilize the logic protection port bandwidth of oneself separately.

6. the method described in claim 1 is characterized in that, among the step D, when in the shared section of striding, wherein during the generation switching request of a logic multiplexing section loop, each logic multiplexing section loop is used the protection routing restoration business of oneself respectively.