Three methods of distributed reservation named FQRP (Forward Queue Reservation Protocol), FRP-λ (Single
Wavelength Forward Reservation Protocol) and Extension of FRP in optical network are proposed in this paper. The
three methods make some improvements on the traditional FRP (Forward Reservation Protocol) and BRP (Backward
Reservation Protocol). They are described, analyzed and simulated in detail in this paper. The simulation results show
that they do have advantages over the traditional two methods. Each has its own advantage.
Crankback is an effective method to enhance the connectivity in the control plane of ASON. By introducing crankback
and computing a new route, connection that hasn't sufficient resource along the origin route can be re-established along a
new route. In existing crankback mechanism, A PATH ERROR message has to be sent back to the source node in the
case of resource insufficient and the source node undertakes the rerouting job. With this mechanism the connectivity is
improved, but the connection establishing time is prolonged. A crankback mechanism based on local node rerouting is
proposed. The simulation shows that the local node rerouting crankback mechanism gains a smaller connection
establishing time than that of the source node rerouting one.
The G.7713 recommendation specifies operations for call setup and release based on a call having a single connection per call, but a call embody any number of connections aren't defined. To enhance network connections establish efficiency and lessen establish time of multiple connections having same properties, multiple connections per a call based on DCM are proposed in ASON. To support multiple connections per a call, DCM message and procedure of process are extended based on traditional scheme. We adopt emulator to simulate the condition of multiple connections per a call in network having 10 nodes and 22 links. Simulate results show that the total time to create multiple connections using such call and network traffic is less than using the traditional call multiple times.
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