Network congestion

In case of overload and congestion control are methods that should allow technical systems can be operated at the highest possible performance, without being damaged.

Overload control (Overload Control)

Under overload control generally understood to mean all the measures and techniques that are introduced with the aim to protect ongoing technical systems from overloads of any kind. To a system overload may occur if the system requirements of the system consume more resources than the system where necessary to meet the requirements period of time. Depending on the nature of the system, different resources can play a role as:

  • Motor performance in mechanical engineering and automotive industries
  • Processor performance in the field of computer technology
  • Mechanical strength of components
  • Dielectric strength of electrical and electronic components
  • Storage capacity in logistics systems
  • Storage in computer technology
  • Transport capacity in logistics company or in transport planning
  • Channel capacity (available data transmission rates ) in computer networks

Congestion control ( congestion control )

Under congestion control are understood techniques for prevention and resolution of congestion ( congestion engl. ) both in traffic planning of people and vehicles as well as in the transport of packet-switched computer networks.

Due to high quality of service requirements, more complex network structures and the need for efficient utilization of the backbone data rate in modern networks often, a simple flow control and retransmission method ( best effort service ) is no longer made ​​, so that more complex methods must be applied, such:

  • The most common mechanism for congestion avoidance is to guarantee a maximum data rate from client to server over the entire network with appropriate signaling protocols (eg, RSVP, MPLS). This is also called Integrated Service ( IntServ ).
  • In Differentiated Service (DiffServ ) compliance with contracts of carriage, however only by the congestion control in routers or switches is implemented. The control is carried out by the packet classification, queuing and various algorithms, according to which the data packets from the queues are forwarded for transmission.

Since these mechanisms can be used not only of traffic congestion, but also generally for shaping the traffic to improve the utilization of network connections, including names such as traffic shaping or German traffic shaping or traffic flow forming are common.

Resource Reservation Protocol Integrated services
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