diff --git a/doc/pdch_timing.txt b/doc/pdch_timing.txt
new file mode 100644
index 0000000..ade646a
--- /dev/null
+++ b/doc/pdch_timing.txt
@@ -0,0 +1,15 @@
+Assuming that PDCH is on TS1
+
+          | DL burst 1/4                  | DL burst 2/4                  | DL burst 3/4                  | DL burst 4/4, our USF!
+          |                               |                               |                               |
+    |<----@------(Fn=0)------------>|<----@------(Fn=1)------------>|<----@------(Fn=2)------------>|<----@------(Fn=3)------------>|
+DL  | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+UL              | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
+                |<----@------(Fn=0)------------>|<----@------(Fn=1)------------>|<----@------(Fn=2)------------>|<----@------(Fn=3)------------>|<----@------(Fn=4)------------>|
+                      |                               |                               |                     |         |                             | |
+                      | UL burst 1/4                  | UL burst 2/4                  | UL burst 3/4        |         | UL burst 4/4                | | UL burst 1/4, Tx time!
+                                                                                                            |                                       |
+                                                                                                            |                                       |
+                                                                                                            |<------------------------------------->|
+                                                                                                                     10 * 0.577 ms = 5.77 ms