A controllable data retransmission method supporting quality of service in an optical burst switching network
An optical burst switching, burst data technology, applied in transmission monitoring/testing/fault measurement systems, error prevention/detection using return channels, fault recovery arrangements, etc., can solve the problem of burst data without considering the number of retransmissions Packet priority factors, not considering multi-service differentiated services, inability to support OBS networks, etc., to ensure the effect of QoS
Active Publication Date: 2017-07-07
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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In view of this consideration, some scholars have proposed a controllable retransmission scheme that considers path association and is based on fragmentation technology. When considering retransmission based on fragmentation technology, this scheme does not consider multi-services, although path association is considered. Differentiate the service situation, so it cannot support the OBS network with multiple services
More importantly, the retransmission probability in the retransmission technology mentioned above is only set by a constant, and does not take into account the number of retransmissions and the priority of burst data packets
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[0036] The technical solution of the present invention will be described in detail below through an embodiment, that is, the data retransmission process in a given path r in the OBS network, but it is not used to limit the scope of the present invention. like figure 1 As shown, the specific steps of the technical solution are:
[0037] Step 1. A source node in the OBS network intends to communicate with a destination node, finds a path r for the burst data service to be sent for it through the one-way resource reservation protocol, and starts to input burst data traffic into path r Stream, which contains multiple types of burst data packets such as video, audio, text, etc., each burst data packet is given different priority levels according to its real-time requirements, without loss of generality, for example, in this In the embodiment, according to the different real-time requirements of the burst data packet, the priority of the burst data packet is divided into two priori...
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The invention discloses a controllable data retransmission method supporting quality of service (Qos) in an optical burst switching network. The method comprises steps that a source node plans to communicate with a target node, find a path via an one-way source reservation protocol and input burst data service flow to the path; different priorities of burst data packets are transmitted in the path, and will smoothly achieve the target node if they do not meet data collision; if meeting collision, the multiple burst data packets will be fragmented; and the fragmented part of the burst data is retransmitted. According to the invention, collision processing is performed by use of the priority fragmentation technology, and multiple-time fragmentation priority re-deciding mechanism is provided, so multi-service differentiation service can be well achieved, and QoS of the OBS network is ensured; retransmission time and retransmission probability weight are set during the retransmission, so retransmission data load capacity of the OBS network can be controlled; and the retransmission method quite satisfies operation condition of the OBS network, and achievements are quite general and have high practical reference value.
Description
technical field [0001] The invention relates to the technical field of optical fiber communication network data exchange, in particular to a controllable data retransmission method supporting Quality of Service (QoS) in an Optical Burst Switching (OBS) network. Background technique [0002] In the OBS network, the edge node is responsible for encapsulating several IP packets into burst data packets according to their attributes such as the same destination, and at the same time generates a burst control packet BCP (BurstControl Packet) for each encapsulated burst data packet. The BCP uses the control wavelength channel to enter the OBS core switching network prior to the burst data packet, and its corresponding burst data packet waits for an offset time to enter the OBS core switching network. Because OBS adopts one-way resource reservation protocols such as JET (Just Enough Time), in the core node of OBS, when multiple burst data packets intend to occupy the same wavelength...
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IPC IPC(8): H04B10/03H04B10/07H04L1/18
Inventor 侯睿
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES