Changes between Version 4 and Version 5 of 802.11/MAC/Upper/MACHighFramework/Scheduler

Timestamp:

Dec 2, 2013, 8:02:13 AM (10 years ago)

Author:

murphpo

Comment:

--

802.11/MAC/Upper/MACHighFramework/Scheduler

@@ -7 +7 @@
 = Scheduler =
 
-The MAC High Framework has the ability to allow an upper-level MAC to schedule the execution of an arbitrary function at some point in the future. Schedules are broken up into two broad categories: coarse and fine. The coarse scheduler can be used to schedule events with an accuracy of  + or - 100ms, while the fine scheduler can be used to schedule events with an accuracy of + or - 100µs. The use of the fine schedule does increase the workload of the processor as it has to poll the scheduled events more often.
+The MAC High Framework provides a scheduler which enables future or periodic execution of arbitrary functions. The scheduler implements two sub-schedules: coarse, for occasional execution with timing accuracy of ±100ms and fine, for events requiring timing accuracy of ±100µs. Events should be added to the fine schedule only when absolutely necessary to avoid unnecessary overhead.
 
 == Example uses of scheduler ==
 
-=== Periodic Beacon Transmissions in the Access Point Upper-level MAC ===
+'''Beacons''': the AP implementation uses the scheduler to periodically transmit beacon frames. This scheduler callback creates a new beacon frame and adds it the broadcast transmit queue.
 
-The AP implementation periodically transmits a beacon MPDU. It uses the scheduler to periodically call its own function that creates and submits a beacon MPDU to the transmit queue.
+'''Active Scan Timeout''': the STA implementation uses the coarse scheduler to set a timeout when waiting for probe responses. This scheduler callback changes the node's center frequency to continue the search for the desired AP.
 
-=== Timeout during Active Scan process in the Station Upper-level MAC ===
+'''Local Traffic Generation''': the [wiki:../LTG LTG framework] uses the scheduler to create arbitrary traffic according to the programmed inter-packet intervals
 
-When performing an active scan to look for nearby access points, the station implementation transmits a probe request followed by waiting for probe responses. This wait is implemented via the scheduler. When the scheduler calls the registered callback, the station implementation jumps to a new channel to continue the process.
 
-=== Local Traffic Generation in the MAC High Framework ===
-
-Internally, the [wiki:../LTG Local Traffic Generator] uses the same scheduler to generate different traffic patterns.