/**
* <br>
* In the first round,</br> <br>
* In the paper the server is supposed to ask sensors for uncoded data.</br> <br>
* We sent the maximum number of bits: 63 bits = "111111"</br> <br>
* Sensor will encode in IEEE double format</br> <br>
* Calculates the i (number of requested bits), as given in the paper</br>
*/
@Override
public String sendRequest(int sensor_id) {
if (is_first_round[sensor_id] || sensor_id == 0 || round_number < M) {
requested_bits[sensor_id] = maximum_number_of_bits_askable;
return "111111";
}
double delta = code_book.getD();
int i =
(int)
Math.ceil(
(0.5
* (Math.log((sigma[sensor_id] * sigma[sensor_id]) / (delta * delta * P_e))
/ Math.log(2.0)))
+ 1);
i = Math.min(i, maximum_number_of_bits_askable); // request not more that 63 bits
i = Math.max(0, i); // request no less than 0 bits
requested_bits[sensor_id] = i;
String bit_string =
tools.pad0ToFront(
Integer.toBinaryString(i),
bits_needed_to_represent_maximum_askable); // pad it to make length 6
return tools.reverse(bit_string);
}
public static void main(String[] args) {
double delta = 0.0001;
double sigma = 0.005;
double P_e = 0.01;
int i =
(int)
Math.ceil(
(0.5 * (Math.log((sigma * sigma) / (delta * delta * P_e)) / Math.log(2.0))) + 1);
i = Math.min(i, 63); // request not more that 63 bits
i = Math.max(0, i); // request no less than 0 bits
}