Choose the size of the window for the replay protocol.
For the selective replay protocol, the window size is <= 2^(m - 1). When n bits are used to number the frames, in order to prevent the old and new receive windows from overlapping after the receiver moves the window forward, the maximum size of the transmit window does not exceed the range of the sequence number, that is, WT <2n-1. When the transmit window takes the maximum value, it is found to be the same as the transmit window and 2n-1 (in most cases, the transmit window is equal to the receive window and 2n-1, because this is the most efficient). If the value of the transmit window is greater than 2n-1, it may cause the new and old receive windows to overlap. "Choose" was equally exciting. Everyone was welcome to read it!
What is the window size for selecting the replay protocol?
For the selective replay protocol, the window size was <=2^(m - 1), and the transmit window could not be larger than the receive window. To maximize efficiency, in most cases, the transmit window was equal to the receive window and was equal to 2n - 1 (n was the number of bits used to number the frame). However, this value must not exceed half of the range of the serial number to avoid the overlap of the new and old receive windows at the receiver. "Choose" was equally exciting. Everyone was welcome to read it!
Choose the size of the reception window of the Retransmission protocol.
By default, the size of the receive window is equal to the size of the send window in the selective replay protocol (SSR), but no information about the specific size was found. In the example where the frame sequence number is represented by 3 bits, the principle that the sending window meets is that the size of the sending window is equal to the receiving window, but the specific size of the receiving window is not specified. "Choose" was equally exciting. Everyone was welcome to read it!
Choose which layer the replay protocol is on
The selective replay protocol was a transport layer protocol. It was a specific example of automatic repeat request (ARQ), which could be used for message unit transmission and confirmation. It was designed to deal with problems such as packet loss, wrong packet, and disorder during network transmission to ensure reliable data transmission. In this protocol, the sending process continuously sends a number of frames according to a window of a specified size, and the receiving process continues to receive and confirm frames after an error occurs. Different from the Fallback N-frame protocol (GGN), it sets up a single acknowledgment, increases the receiving window, and designs a receive buffer to buffer the frames that arrive out of order. This allows only the wrong frames to be retransmitted, thereby improving transmission performance. "Choose" was equally exciting. Everyone was welcome to read it!
Choose which layer to set the replay protocol on
The selection of the replay protocol was set at the transport layer. Transmission layer protocol such as the Transmission Control protocol (TCM) used a packet replay strategy to deal with problems in network transmission to ensure reliable data transmission. Choosing a replay protocol was a way to achieve reliable transmission. It used a specific mechanism to ensure that only the wrong frames were retransmitted during the data transmission process to improve transmission efficiency. These operations were within the scope of the transmission layer. "Choose" was equally exciting. Everyone was welcome to read it!
How to set the reception window for selecting the replay protocol?
In the selection of the re-transmission protocol, the receiving window size must satisfy 1<Wh <= MT (MT is the sending window size). If QR = 1, it is the same as the fallback N frame protocol; if QR> And the transmission window size Wt must be greater than 1 and less than 2^(n - 1)(n is the number of bits that make up the packet sequence number). "Choose" was equally exciting. Everyone was welcome to read it!
Fallback n frame protocol sending window size
The size of the sending window of the fallback N-frame protocol is greater than 1, and multiple data packets can be sent consecutively. " Choose " was equally exciting. Everyone was welcome to read it!
Continuous arq protocol and sliding window protocol
In the continuous ARQ protocol, the sender maintained a sending window of a certain size, and the packets within the window could be sent continuously without waiting for the other party's acknowledgment. The sender would slide the sending window forward by one packet every time it received an acknowledgment. The receiver usually uses the method of accumulating acknowledgement, that is, after receiving several packets, it sends an acknowledgement to the last packet that arrives in order, indicating that all the packets up to this packet have been received correctly. However, this method has shortcomings. For example, when the middle packet is lost, the sender cannot know the situation of the subsequent packets, and may need to re-transmit more packets. The sliding window protocol involves a sending window and a receiving window. The transmit window is the range of sequence numbers of the frames that have been sent but have not been acknowledged, and the receive window is the range of sequence numbers of the frames that are expected to be received. When the default window size is 1, you can operate according to the specific sending process. The sliding window protocol could improve the channel utilization and was a reliable transmission mechanism for data communication. The continuous ARQ protocol can be seen as a specific application form of the sliding window protocol under certain conditions (such as the cumulative acknowledgment method). They are all protocol mechanisms that exist to achieve effective and reliable data transmission in the network. "Choose" was equally exciting. Everyone was welcome to read it!
Which layer of file is the chosen replay protocol?
The selective replay protocol was a transport layer protocol. The transport layer was responsible for providing end-to-end communication services between processes on different hosts. A typical transport layer protocol such as the Transmission Control protocol used a packet replay strategy to ensure reliable data transmission to deal with problems such as packet loss, wrong packets, and disorder. The selective replay protocol was also a protocol mechanism used to ensure reliable data transmission, so it belonged to the transport layer protocol category. " Choose " was equally exciting. Everyone was welcome to read it!
Which layer does the select replay protocol work on?
The selective repeat protocol was a data link layer protocol that worked in the data link layer. " Choose " was equally exciting. Everyone was welcome to read it!
How to calculate the channel utilization rate of the selected replay protocol?
Let the transmission delay + the round-trip delay + the reception delay be the transmission period of one frame, and the continuous period is the ARQ. The channel utilization rate of (including the selection of the re-transmission protocol) is more than that of the stop-and-wait protocol by (n)(window size). The channel utilization rate of the stop-and-wait protocol is (<<<frac><br>><<br>></>>)(where <<br> is the transmission delay,<<<Ta>> is the reception delay, and <<<br> is the round-trip delay). Therefore, the calculation formula for the channel utilization rate of the chosen replay protocol <<br> is <<frac>{n <times><>></>><). At the same time, the number of bits in the frame sequence number is set to <<k>>, and the transmission window of the <<PR>> protocol is usually <<<leq2 ^{k}-1>>. In the case where both <<T>> and <<T>> are determined, the larger the <<N>>, the greater the channel utilization. "Choose" was equally exciting. Everyone was welcome to read it!