Sliding Window Protocol

September 12, 2022

The Sliding Window Protocol is a packet-based data-transmission protocol. It is used when reliable, in-order packet delivery is required. It is a common feature of both the Transmission Control Protocol (TCP) and the data link layer. It is used in both the transmission of data and control of a network. Its advantages are numerous and include reliable data delivery and reduced latency. Here are some of the ways it is used in packet-based communication systems.

The sliding window technique works by converting two nested loops into a single loop. This technique allows for less data to be sent to and from the receiving computer. The sliding window technique can be used to reduce the time complexity of a complex algorithm. The Sliding Window is also an efficient method for reducing memory usage.

The Sliding Window method moves a window of a specified length Len over the data to compute a statistic. The window is initially filled with zeros in the first time step. Then, it is filled with samples from the previous data frame. Sliding window methods have a state, which remembers the previous data.

Sliding window protocols work with a network model. The sender shares data frames with the receiver and waits for acknowledgements from the receiver. Once a packet is acknowledged by the receiver, the sender adjusts the send window so it incorporates the next consecutive data packet. This process is repeated until the sender receives an ACK. The ACK can be specific to a single packet or to multiple packets.

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This protocol is part of the Open Systems Interconnection (OSI) model. This type of protocol ensures reliable delivery of data packets across network devices. It also offers a balanced approach to packet delivery. Each data packet must be acknowledged by its recipient before it can be sent to another device. It also helps ensure a high level of security.

One common example of a sliding window protocol is Go-Back-N ARQ. It starts with a low packet count and increases its packet count after each ack packet is received. As the window grows, it slides by one packet every time a new packet is sent. This protocol is very effective in short-range communication, but is inefficient over long-range links.

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