How to reduce latency in satellite network and why use methods

Posted by Hao Do on June 26, 2023

Data compression

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To mathematically demonstrate that data compression reduces latency when transmitting data over a satellite network, we need to consider the relationship between data size, transmission time, and latency. 

Let's assume we have a dataset of size D (in bits) that needs to be transmitted over a satellite network. The transmission time without compression, denoted as T_without, can be calculated using the following formula:

T_without = D / R

where R is the transmission rate or bandwidth of the satellite network in bits per second.

Now, let's introduce data compression into the equation. Let C represent the compression ratio, which indicates how much the data can be compressed. The compressed data size, denoted as D_compressed, can be calculated as:

D_compressed = D / C

Assuming the compression process adds negligible latency, the transmission time with compression, denoted as T_with, can be calculated using the same formula as before:

T_with = D_compressed / R

Now, let's compare the latency between the two scenarios: without compression (T_without) and with compression (T_with). We can define the latency reduction factor (LRF) as the ratio of latency reduction when using compression compared to without compression:

LRF = (T_without - T_with) / T_without

Substituting the values from the previous equations, we have:

LRF = (D / R - D_compressed / R) / (D / R)

Simplifying further:

LRF = (D - D / C) / D
LRF = (1 - 1 / C)

The above equation demonstrates the latency reduction factor achieved through data compression. As the compression ratio C increases, the latency reduction factor also increases, implying reduced latency when transmitting data over a satellite network.

Therefore, mathematically, we can conclude that data compression reduces latency when transmitting data over a satellite network, as evidenced by the decreasing latency reduction factor as the compression ratio increases.
  

Data aggregation

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To mathematically demonstrate that data aggregation helps reduce latency when transmitting data over a satellite network, we need to consider the relationship between data size, transmission time, and latency.

Let's assume we have a set of N data packets, each with a size of D (in bits), that need to be transmitted over a satellite network. The transmission time without data aggregation, denoted as T_without, can be calculated using the following formula:

T_without = N * (D / R)

where R is the transmission rate or bandwidth of the satellite network in bits per second.

Now, let's introduce data aggregation into the equation. Data aggregation combines multiple smaller data packets into larger ones, reducing the number of packets transmitted. Let M represent the number of aggregated packets, where M <= N. The aggregated data packet size, denoted as D_aggregated, can be calculated as:

D_aggregated = M * D

The transmission time with data aggregation, denoted as T_with, can be calculated using the same formula as before:

T_with = D_aggregated / R

Now, let's compare the latency between the two scenarios: without data aggregation (T_without) and with data aggregation (T_with). We can define the latency reduction factor (LRF) as the ratio of latency reduction when using data aggregation compared to without data aggregation:

LRF = (T_without - T_with) / T_without

Substituting the values from the previous equations, we have:

LRF = (N * (D / R) - (M * D) / R) / (N * (D / R))

Simplifying further:

LRF = (N - M) / N

The above equation demonstrates the latency reduction factor achieved through data aggregation. As the number of aggregated packets (M) increases relative to the total number of packets (N), the latency reduction factor also increases, implying reduced latency when transmitting data over a satellite network.

Therefore, mathematically, we can conclude that data aggregation helps reduce latency when transmitting data over a satellite network, as evidenced by the decreasing latency reduction factor as the number of aggregated packets increases.
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# Data prediction

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Let's assume we have a sequence of data points X = [x1, x2, ..., xn] that need to be transmitted over a satellite network. Each data point represents a sample or measurement taken at a specific time. The transmission time for each data point without data prediction is denoted as T_without.

Now, let's introduce data prediction into the equation. We use a prediction model to estimate the future data points based on the past observations. Let Y = [y1, y2, ..., yn] represent the predicted data points. The transmission time for each predicted data point is denoted as T_prediction.

The total transmission time without data prediction, T_without_total, can be calculated as the sum of the transmission times for each individual data point:

T_without_total = T_without * n

The total transmission time with data prediction, T_with_total, can be calculated as the sum of the transmission times for each predicted data point:

T_with_total = T_prediction * n

To compare the latency between the two scenarios, we can calculate the latency reduction factor (LRF) as the ratio of latency reduction when using data prediction compared to without data prediction:

LRF = (T_without_total - T_with_total) / T_without_total

Substituting the values from the previous equations, we have:

LRF = (T_without * n - T_prediction * n) / (T_without * n)

Simplifying further:

LRF = (T_without - T_prediction) / T_without

The above equation demonstrates the latency reduction factor achieved through data prediction. If the transmission time for the predicted data points (T_prediction) is smaller than the transmission time for the original data points (T_without), the latency reduction factor will be positive, indicating reduced latency when transmitting data over a satellite network with data prediction.

Therefore, mathematically, we can conclude that data prediction helps reduce latency when transmitting data over a satellite network if the transmission time for the predicted data points is smaller than the transmission time for the original data points.

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