diff --git a/algo/ledbat.scm b/algo/ledbat.scm
new file mode 100644
index 0000000..09bec04
--- /dev/null
+++ b/algo/ledbat.scm
@@ -0,0 +1,15 @@
+; RFC6817
+; https://tools.ietf.org/html/rfc6817
+
+(define-record-type ledbat-params
+  (fields 
+
+(define-record-type ledbat-state
+  (fields current_delays base_delays last_rollover flightsize cwnd cto))
+
+(define (on-init params) 
+  (make-ledbat-state
+
+(define (on-data) )
+
+(define (on-ack) )