diff --git a/src/main/java/fr/ntr/AccessPoint.java b/src/main/java/fr/ntr/AccessPoint.java
index b5a6b2c..105d7c3 100644
--- a/src/main/java/fr/ntr/AccessPoint.java
+++ b/src/main/java/fr/ntr/AccessPoint.java
@@ -33,6 +33,8 @@ public class AccessPoint {
      */
     private final double min, max;
 
+    private Random random = new Random();
+
     
     public AccessPoint(Scheduler scheduler, ResourceBlock[][] frame, List<User> users, int timeSlotNb, int subCarrierNb, double min, double max) {
         this.min = min;
@@ -65,7 +67,6 @@ public class AccessPoint {
 
     private void updateBandwidth(int ticks) {
         int n = 200;
-        Random random = new Random();
         int timeInterval = 50 + random.nextInt(51);
         for(User user : users) {
             // On régénère le tableau de débits toutes les 50 ms
diff --git a/src/main/java/fr/ntr/User.java b/src/main/java/fr/ntr/User.java
index 5669f95..dce601b 100644
--- a/src/main/java/fr/ntr/User.java
+++ b/src/main/java/fr/ntr/User.java
@@ -12,6 +12,8 @@ public class User {
     private final List<Packets> packetsSent;
     private int leftForNextSource;
 
+    private Random random = new Random();
+
     public User(double distance, int timeSlotNb,  int subCarrierNb) {
         this.distance = distance;
         this.bandwidthTable = new double[timeSlotNb][subCarrierNb];
@@ -21,7 +23,7 @@ public class User {
     }
 
     public void generateBandwidth() {
-        double random = Math.random();
+        double random = this.random.nextDouble();
         for(int i = 0; i < bandwidthTable.length; i++) {
             for(int j = 0; j < bandwidthTable[i].length; j++) {
                 double h = 1 * Math.sqrt(-2 * Math.log(1 - random));