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Selective Retransmission Formula

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Selective Retransmission also called Selective Repeat ARQ (Automatic Repeat Request), is a data link layer protocol that uses the sliding window method for reliable delivery of data frames. Check FAQs
Rs=Nwd⋅LH⋅En+Bwd⋅E1⋅Nwd
Rs - Selective Retransmission?Nwd - Number of Word Message Consist?L - Information Bits?H - Header Bits?En - Expected Number of Transmission?Bwd - Number of Bits per Word?E1 - Expected One Transmission?

Selective Retransmission Example

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Here is how the Selective Retransmission equation looks like with Values.

Here is how the Selective Retransmission equation looks like with Units.

Here is how the Selective Retransmission equation looks like.

0.0723Edit=19Edit⋅3Edit9Edit⋅4Edit+12Edit⋅3.3Edit⋅19Edit
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Selective Retransmission Solution

Follow our step by step solution on how to calculate Selective Retransmission?

FIRST Step Consider the formula
Rs=Nwd⋅LH⋅En+Bwd⋅E1⋅Nwd
Next Step Substitute values of Variables
∴ Rs=19⋅39⋅4+12⋅3.3⋅19
Next Step Prepare to Evaluate
∴ Rs=19⋅39⋅4+12⋅3.3⋅19
Next Step Evaluate
∴Rs=0.0722983257229833
LAST Step Rounding Answer
∴Rs=0.0723

Selective Retransmission Formula Elements

Variables
Selective Retransmission
Selective Retransmission also called Selective Repeat ARQ (Automatic Repeat Request), is a data link layer protocol that uses the sliding window method for reliable delivery of data frames.
Symbol: Rs
Measurement: NAUnit: Unitless
Note: Value can be positive or negative.
Number of Word Message Consist
Number of Word Message Consist in a message can vary depending on the specific protocol and encoding scheme being used.
Symbol: Nwd
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Information Bits
Information bits refer to the fundamental units of data that are transmitted and received between devices or systems.
Symbol: L
Measurement: NAUnit: Unitless
Note: Value can be positive or negative.
Header Bits
Header bits refer to the bits of information included at the beginning of a data transmission packet or frame.
Symbol: H
Measurement: NAUnit: Unitless
Note: Value can be positive or negative.
Expected Number of Transmission
Expected Number of Transmission refers to the average number of times a packet or data transmission needs to be sent from a transmitter to a receiver in order to achieve successful delivery.
Symbol: En
Measurement: NAUnit: Unitless
Note: Value can be positive or negative.
Number of Bits per Word
Number of Bits per Word refers to the number of binary bits contained in a single word of data transmitted over the wireless channel.
Symbol: Bwd
Measurement: NAUnit: Unitless
Note: Value should be greater than 0.
Expected One Transmission
Expected One Transmission typically refers to the desired outcome or expectation of successfully transmitting data or information in a wireless network using a single transmission attempt.
Symbol: E1
Measurement: NAUnit: Unitless
Note: Value can be positive or negative.

Credits

Creator Image
Created by Shobhit Dimri
Bipin Tripathi Kumaon Institute of Technology (BTKIT), Dwarahat
Shobhit Dimri has created this Formula and 900+ more formulas!
Verifier Image
Verified by Urvi Rathod
Vishwakarma Government Engineering College (VGEC), Ahmedabad
Urvi Rathod has verified this Formula and 1900+ more formulas!

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How to Evaluate Selective Retransmission?

Selective Retransmission evaluator uses Selective Retransmission = (Number of Word Message Consist*Information Bits)/(Header Bits*Expected Number of Transmission+Number of Bits per Word*Expected One Transmission*Number of Word Message Consist) to evaluate the Selective Retransmission, The Selective Retransmission formula is defined as Selective repeat protocol, also called Selective Repeat ARQ (Automatic Repeat Request), is a data link layer protocol that uses the sliding window method for reliable delivery of data frames. Here, only the erroneous or lost frames are retransmitted, while the good frames are received and buffered. Selective Retransmission is denoted by Rs symbol.

How to evaluate Selective Retransmission using this online evaluator? To use this online evaluator for Selective Retransmission, enter Number of Word Message Consist (Nwd), Information Bits (L), Header Bits (H), Expected Number of Transmission (En), Number of Bits per Word (Bwd) & Expected One Transmission (E1) and hit the calculate button.

FAQs on Selective Retransmission

What is the formula to find Selective Retransmission?
The formula of Selective Retransmission is expressed as Selective Retransmission = (Number of Word Message Consist*Information Bits)/(Header Bits*Expected Number of Transmission+Number of Bits per Word*Expected One Transmission*Number of Word Message Consist). Here is an example- 0.072298 = (19*3)/(9*4+12*3.3*19).
How to calculate Selective Retransmission?
With Number of Word Message Consist (Nwd), Information Bits (L), Header Bits (H), Expected Number of Transmission (En), Number of Bits per Word (Bwd) & Expected One Transmission (E1) we can find Selective Retransmission using the formula - Selective Retransmission = (Number of Word Message Consist*Information Bits)/(Header Bits*Expected Number of Transmission+Number of Bits per Word*Expected One Transmission*Number of Word Message Consist).
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