Resource reservation method based on intra-domain network state perception in optical burst exchange

Abstract

A resource reservation method based on intra-domain network status sensing comprises collision detection step and dynamic QoS support step. The collision detection step of intra-domain network status sensing comprises: sending burst control grouping to OBS network in broadcasting mode, all edge node of OBS domain using received BCP for maintaining a intra-domain network status model; Introducing a time slot for detecting latent collision, size of time slot equaling to distance between farthest a pair of nodes in optical signal transmission domain, that is, time needed by intra-domain network diameter. Edge node working step: controlling for creating BCP, sending BCP to OBS network, executing collision detection to received BCP, completing burst data transmission, creating corresponding statistical information. Working steps for setting core node: executing collision detection for received BCP, configuring optical switch OXC according to collision detection result.

Description

technical field [0001] The invention belongs to the field of data switching network, and in particular relates to a resource reservation method in an optical burst switching system. Background technique [0002] OBS (Optical Burst Switching) usually adopts a one-way resource reservation method, and the burst control packet BCP establishes a one-way reserved time slot optical wavelength channel for the corresponding burst data DB to realize dynamic allocation of bandwidth. The latter are not only separated in time, but also transmitted in different optical wavelength channels. This separated control lowers the technical realization threshold of OBS, making OBS an attractive optical switching method. [0003] Therefore, the resource reservation mode becomes a very key technology of the OBS network. The resource reservation method directly affects the end-to-end delay of burst data, the blocking rate of burst control packet requests, and the drop rate of burst data. [0004]...

AI Technical Summary

Problems solved by technology

The representative of TAG-OBS is JIT (Just-In-Time) [1] and JET (Just-Enough-Time) [2] Two, in the TAG-OBS resource reservation protocol, since there is no need to wait for the confirmation message of the destination edge node, the end-to-end delay is small, and the disadvantage is that potential conflicts cannot be detected

The JET-QoS scheme assigns different offset times to burst data of different traffic types, with a longer offset time for high-priority burst data and a shorter offset time for low-priority burst data. In this way, high-priority burst data has a higher probability to be reserved for resources. One disadvantage of this method is that high-priority data tends to experience longer delays, and often high-priority data has a greater impact on delays. more sensitive

But one of the disadvantages is to increase the assembly complexity of edge nodes

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