diff --git a/src/mobility/position-allocator.cc b/src/mobility/position-allocator.cc
index 98f8214ed..cdd093d50 100644
--- a/src/mobility/position-allocator.cc
+++ b/src/mobility/position-allocator.cc
@@ -46,6 +46,33 @@ PositionAllocator::PositionAllocator ()
 PositionAllocator::~PositionAllocator ()
 {}
 
+NS_OBJECT_ENSURE_REGISTERED (ListPositionAllocator);
+
+TypeId 
+ListPositionAllocator::GetTypeId (void)
+{
+  static TypeId tid = TypeId ("ListPositionAllocator")
+    .SetParent<PositionAllocator> ()
+    .AddConstructor<ListPositionAllocator> ()
+    ;
+  return tid;
+}
+ListPositionAllocator::ListPositionAllocator ()
+{}
+void 
+ListPositionAllocator::Add (Vector v)
+{
+  m_positions.push_back (v);
+  m_current = m_positions.begin ();
+}
+Vector 
+ListPositionAllocator::GetNext (void) const
+{
+  Vector v = *m_current;
+  m_current++;
+  return v;
+}
+
 TypeId 
 GridPositionAllocator::GetTypeId (void)
 {
diff --git a/src/mobility/position-allocator.h b/src/mobility/position-allocator.h
index 483617ccf..19e301a7e 100644
--- a/src/mobility/position-allocator.h
+++ b/src/mobility/position-allocator.h
@@ -43,7 +43,19 @@ public:
   virtual Vector GetNext (void) const = 0;
 };
 
-class GridPositionAllocator : public Object
+class ListPositionAllocator : public PositionAllocator
+{
+public:
+  static TypeId GetTypeId (void);
+  ListPositionAllocator ();
+  void Add (Vector v);
+  virtual Vector GetNext (void) const;
+private:
+  std::vector<Vector> m_positions;
+  mutable std::vector<Vector>::const_iterator m_current;
+};
+
+class GridPositionAllocator : public PositionAllocator
 {
 public:
   static TypeId GetTypeId (void);