Method for dynamic lossless adjustment of bandwidth of an embedded resilient packet ring network

• US 20060062161A1
• Filed: 09/12/2005
• Published: 03/23/2006
• Est. Priority Date: 03/11/2003
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Quan, Xingyue, Tang, Yong
• Granted Patent: US 7,764,631 B2
• Time in Patent Office: Days
• US Class Current: 370/258
• CPC Class Codes: H04J 3/1611 Synchronous digital hierarchy [SDH] or SONET H04J3/1664 takes precedence for interactions with OTN
• CPC Class Codes: H04L 12/28 characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks] wireless communication networks H04W ; arrangements for dividing the transmission path H04W40/00
• CPC Class Codes: H04L 12/42 Loop networks
• CPC Class Codes: Y10S 370/907 Synchronous optical network, SONET

Abstract

Disclosed is a method for dynamically and losslessly adjusting bandwidth of an embedded Resilient Packet Ring (RPR) ring network, in which dynamic and lossless bandwidth adjustment for an RPR ring network embedded in a Synchronous Digital Hierarchy (SDH)/Synchronous Optical Network (SONET) can be realized through adding a Link Capacity Adjustment Scheme (LCAS) system in the SDH/SONET processing layer. When it is required to increase ring network bandwidth, the bandwidth of the link section between sites on the SDH/SONET processing layer is first increased. Then the LCAS system in the SDH/SONET processing layer is started, and the actual bandwidth of the link on the SDH/SONET processing layer is increased losslessly with the LCAS system. Finally the bandwidth of the ring network on the RPR processing layer is increased. When it is required to decrease ring network bandwidth, the bandwidth of the ring network on the RPR processing layer is first decreased. Then the LCAS system in the SDH/SONET processing layer is started, and the actual bandwidth of the link on the SDH/SONET processing layer is decreased losslessly with the LCAS system. Finally the bandwidth of the link section between sites on the SDH/SONET processing layer is decreased. With the disclosed method, dynamic and lossless bandwidth adjustment for an embedded RPR ring network in SDH/SONET can be realized.

Claims

1. A method for adjusting bandwidth of an embedded Resilient Packet Ring (RPR) ring network dynamically and losslessly, the embedded RPR ring network being in a Synchronous Digital Hierarchy (SDH)/Synchronous Optical Network (SONET) comprising an SDH/SONET processing layer and an RPR processing layer, wherein a Link Capacity Adjustment Scheme (LCAS) system is added in the SDH/SONET processing layer, the method comprising the steps of:

(A1) allocating a demanded bandwidth as bandwidth of a link between sites to be increased in the ring network on the SDH/SONET processing layer;

(B1) starting the LCAS system in the SDH/SONET processing layer, and losslessly increasing an actual bandwidth of the link, in which bandwidth is required to be increased to the demanded bandwidth; and

(C1) configuring the demanded bandwidth as bandwidth of the ring network on the RPR processing layer.

2. The method according to claim 1, wherein

said step A1 comprises the step of allocating the demanded bandwidth as bandwidth of links between all sites in the ring network on the SDH/SONET processing layer;

and

said step B1 comprises the step of losslessly increasing the actual bandwidth of the links between all sites in the ring network on the SDH/SONET processing layer to the demanded bandwidth.

3. The method according to claim 1, wherein said step C1 is implemented through adjusting bandwidth allocation parameters of the ring network on the RPR processing layer.

4. The method according to claim 2, wherein said step C1 is implemented through adjusting bandwidth allocation parameters of the ring network on the RPR processing layer.

5. The method according to claim 1, wherein in said step B1, the LCAS system in the SDH/SONET processing layer is started in a manual manner or an automatic manner.

6. The method according to claim 2, wherein in said step B1, the LCAS system in the SDH/SONET processing layer is started in a manual manner or an automatic manner.

7. A method for adjusting bandwidth of an embedded RPR ring network dynamically and losslessly, the embedded RPR ring network being in an SDH/SONET comprising an SDH/SONET processing layer and an RPR processing layer, wherein a LCAS system is added in the SDH/SONET processing layer, the method comprising the steps of:

(A2) allocating a demanded bandwidth as bandwidth of the ring network on the RPR processing layer;

(B2) starting the LCAS system in the SDH/SONET processing layer, and losslessly decreasing an actual bandwidth of a link of the ring network on the SDH/SONET processing layer, in which bandwidth is required to be decreased to the demanded bandwidth; and

(C2) configuring a demanded bandwidth as bandwidth of the link.

8. The method according to claim 7, wherein

said step B2 comprises the step of losslessly decreasing the actual bandwidth of links between all sites in the ring network on the SDH/SONET processing layer to the demanded bandwidth, and

said step C2 comprises the step of configuring the demanded bandwidth as bandwidth of the links between all sites in the ring network on the SDH/SONET processing layer.

9. The method according to claim 7, wherein said step A2 is implemented through adjusting bandwidth allocation parameters of the ring network on the RPR processing layer.

10. The method according to claim 8, wherein said step A2 is implemented through adjusting bandwidth allocation parameters of the ring network on the RPR processing layer.

11. The method according to claim 7, after said step C2, further comprising the step of removing redundant virtual containers in links between sites of the ring network on the SDH/SONET processing layer.

12. The method according to claim 8, after said step C2, further comprising the step of removing redundant virtual containers in links between sites of the ring network on the SDH/SONET processing layer.

13. The method according to claim 7, wherein in said step B2, the LCAS system in the SDH/SONET processing layer is started in a manual manner or an automatic manner.

14. The method according to claim 8, wherein in said step B2, the LCAS system in the SDH/SONET processing layer is started in a manual manner or an automatic manner.