![]() ![]() Consequently, the size of the sending window is 2n?1. If the sequence number of the frames is an n-bit field, then the range of sequence numbers that can be assigned is 0 to 2n?1. The size of the sending window determines the sequence number of the outbound frames. If the acknowledgment of a frame is not received within an agreed-upon time, all frames starting from that frame are retransmitted. The maximum number of frames that can be sent depends upon the size of the sending window. The frames are sequentially numbered and have a finite number of frames. Go-Back-N ARQ provides for sending multiple frames before receiving the acknowledgment for the first frame. Working Principle for Go-Back-N and Selective Repeat Protocol Go-Back-N Protocol For example, if the sequence number ranges from 0-15, the window size for both the sender and receiver node will be 8. The window size is kept at half of the maximum sequence number of the data frame. At the same time, the receiving window is responsible for storing the data frames received by the receiving node. The sending window stores the data frames to be transmitted by the sender node. In order to implement Selective Repeat Protocol requires, two windows of the same size. This protocol is more efficient as it only retransmits the corrupted data frames during transmission in the network. The good data frames are received and buffered by the receiver node. This protocol uses a sliding window method that ensures reliable delivery of data frames from the sender node to the receiver node. This protocol is implemented in the data link layer of the node in the network. This protocol is also known as Selective Repeat Automatic Repeat Request. The sender node then goes to the sequence number of the last frame acknowledged by the receiver, and it then fills the window beginning with this frame and continues the transmission process. Once the sender node transmits all the data frames in the window, it searches for all the frames since the first data frame was lost during transmission. ![]() It then transmits an acknowledgment for the last data frame that was transmitted in the correct order. It only accepts in-order delivery of nodes. This means that it deletes any duplicate frame already acknowledged by the receiver or any frame out of order that is expected to receive later by the node. The receiver discards any data frame with a different sequence number. The receiver node keeps track of the sequence number of the next frame to be received by the receiver node. This is a special case of sliding window protocol where the sender window size is N, and the receiver window size is 1. The sender can transmit these frames without receiving an acknowledgment from the receiver node. The window size determines the number of nodes. In this protocol, the sender node continuously transmits a defined number of data frames in the network. It is an example of the Automatic Repeat Request (ARQ) protocol. Next → ← prev Difference Between Go-Back-N and Selective Repeat Protocol Go-Back-N Protocol
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |