Light burst exchange network competitive solving method

Abstract

The invention is a method for solving light burst switch network competition, belonging to optical communication technical field, comprising the steps of: establishing subfield relation: each router on each routing path knows its own subfield and the head node information thereof through the subfield relation; priority determining: as competition happens, competing nodes determine whether burst packet is a priority burst packet or a regulating burst packet according to the given rules so as to process respectively; condition judging: for a competing burst packet determined to regulate burst request, judging regulating conditions it meets, thus adopting DoD, WAoD or discard processing policy; processing of WAoD: dynamically regulating the booked length of a burst packet in some subfield through CLSP signaling protocol; and discarding and releasing resources. And the invention can implement screening conflicting burst packets and provides better transmission assurance for high-quality services, thus able to improve quality of service of OBS network.

Description

technical field [0001] The invention relates to a method in the technical field of optical communication, in particular to a method for solving competition in an optical burst switching network, which can reduce the blocking rate of burst data packets in the network and improve network service quality. technical background [0002] Optical Burst Switching (OBS) is an emerging optical switching technology for IP services carried by wavelength division multiplexing technology in recent years. OBS combines the advantages of Optical Circuit Switching (OCS) and Optical Packet Switching (OPS). It is a compromise optical switching technology with medium granularity. Data and control information are transmitted separately in time and space (different wavelength channels). OBS The edge node assembles multiple customer data packets (such as IP packets) into a burst packet, and sends the corresponding control information header (called control packet) for each data packet in advance to...

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1) This method is applied in OBS networks without wavelength converters, and the OBS network structure with wavelength conversion capabilities for a few scattered nodes does not give full play to the special advantages of wavelength converters

There is no work so far that combines wavelength allocation and slotting and gives a contention solution

3) Compared with the traditional OBS contention processing strategy, DoD can save two contention burst packets at the same time when the contention of reserved resources occurs in the first half of the path (contention resolved---CR situation). However, when the contention of reserved resources occurs In the second half of the path (contention-not-resoved---CNR situation), only burst packets with high priority can be guaranteed to be transmitted, and other competing burst packets are still selected to be discarded, but in fact at this time due to burst control The packet is closer to the destination, and more nodes in front have reserved resources, so it needs to be rescued more than the case of CR

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