Changes between Version 11 and Version 12 of 802.11/MAC/Upper

Timestamp:

Aug 2, 2013, 11:05:08 AM (11 years ago)

Author:

chunter

Comment:

--

802.11/MAC/Upper

@@ -35 +35 @@
  * {{{Idle}}} → {{{MPDU Rx}}}: This transition occurs when the [wiki:../Low low-level MAC] has indicated that a reception has occurred with the following criteria: (a) the received packet is not a control packet (e.g. ACK, RTS, CTS) and (b) the received packet has a receiver address that is either a broadcast packet or a unicast packet whose address matches the MAC address of the node running this software.
 
- * {{{MPDU Rx}}} → {{{Ethernet Tx}}}: This transition occurs when a wireless MPDU data reception occurs that should be de-encapsulated and via Ethernet. Note: Unlike the {{{MPDU Tx}}} state, the {{{Ethernet Tx}}} state does not employ a queue. As such, it can be directly accessed from the {{{MPDU Rx}}} state without transitioning through {{{Idle}}}. The reason for this is that, even at the fastest 802.11g rates, wireless packets are much slower than wired packets. When receiving a wireless packet, there is enough time to directly transmit a wired packet without halting the next wireless reception. This is not the case for wired receptions.
+ * {{{MPDU Rx}}} → {{{Ethernet Tx}}}: This transition occurs when a wireless MPDU data reception occurs that should be de-encapsulated and via Ethernet. ''Note: Unlike the {{{MPDU Tx}}} state, the {{{Ethernet Tx}}} state does not employ a queue. As such, it can be directly accessed from the {{{MPDU Rx}}} state without transitioning through {{{Idle}}}. There is a good reason for this asymmetry: even at the fastest 802.11g rates, wireless packets are much slower than gigabit-per-second wired packets. When receiving a wireless packet, there is enough time to directly transmit a wired packet without halting the next wireless reception. This is not the case for wired receptions, so they must be queued in order to mitigate dropping packets during bursty Ethernet arrivals.''
 
  * {{{Idle}}} → {{{Ethernet Rx}}}: This transition occurs when any packet has been received by the Ethernet MAC on the board.
 
- * {{{Idle}}} → {{{Scheduled Event}}}:
+ * {{{Idle}}} → {{{Scheduled Event}}}: This transition occurs when a timer indicates that a scheduled event should be processed.