Changes between Version 3 and Version 4 of 802.11/MAC/Lower/DCF

Timestamp:

Aug 6, 2015, 5:00:57 PM (9 years ago)

Author:

chunter

Comment:

--

802.11/MAC/Lower/DCF

@@ -28 +28 @@
 When an IPC message arrives, the MAC Low Framework needs to perform a few different actions before passing the frame off to the DCF for transmission.
 
-1. 
-
 Pseudocode:
 {{{
-        if
+        convert high-level MCS/rate into PHY-understandable rate parameter
+        
+        if( insert duration )
+                calculate duration of SIFS and ACK
+                insert duration into MAC header
+
+        if ( insert timestamp )
+                tell PHY Tx which bytes to overwrite with usec timestamp
+
+        call the frame_tx_callback()
 }}}
+
+For the DCF application, the {{{frame_tx_callback()}}} executes the {{{frame_transmit()}}} function in the DCF code.
+
+----
+
+'''P2:'''
+
+The {{{frame_transmit()}}} context will only exit when an MPDU is "done." Here, "done" can mean multiple things:
+
+* If it is a unicast frame and an acknowledgment for that frame has been received
+* If it is a unicast frame and all retransmission attempts have failed
+* If it is a multicast frame, an MPDU transmission is done as soon as the PHY transmission is complete since no acknowledgment is required.
 
 == MPDU Reception ==