This MIB is intended to be implemented on all those
devices operating as Central controllers, that
terminate the Light Weight Access Point Protocol
tunnel from Cisco Light-weight LWAPP Access Points.
        
Information provided by this MIB is used to study
the quality of service in the voice and video traffic
on the WLAN.
        
The relationship between CC and the LWAPP APs
can be depicted as follows:
        
      +......+     +......+     +......+
      +      +     +      +     +      +
      +  CC  +     +  CC  +     +  CC  +
      +      +     +      +     +      +
      +......+     +......+     +......+
        ..            .             .
        ..            .             .
       .  .            .             .
      .    .            .             .
     .      .            .             .
    .        .            .             .
+......+ +......+     +......+      +......+
+      + +      +     +      +      +      +
+  AP  + +  AP  +     +  AP  +      +  AP  +
+      + +      +     +      +      +      +
+......+ +......+     +......+      +......+
           .              .             .
         .  .              .             .
        .    .              .             .
       .      .              .             .
      .        .              .             .
   +......+ +......+     +......+      +......+
   +      + +      +     +      +      +      +
   +  MN  + +  MN  +     +  MN  +      +  MN  +
   +      + +      +     +      +      +      +
   +......+ +......+     +......+      +......+
        
        
The LWAPP tunnel exists between the controller and
the APs.  The MNs communicate with the APs through
the protocol defined by the 802.11 standard.
        
LWAPP APs, upon bootup, discover and join one of the
controllers and the controller pushes the configuration,
that includes the WLAN parameters, to the LWAPP APs.
The APs then encapsulate all the 802.11 frames from
wireless clients inside LWAPP frames and forward
the LWAPP frames to the controller.
        
                   GLOSSARY
        
Access Point ( AP )
        
An entity that contains an 802.11 medium access
control ( MAC ) and physical layer ( PHY ) interface
and provides access to the distribution services via
the wireless medium for associated clients.  
        
LWAPP APs encapsulate all the 802.11 frames in
LWAPP frames and sends them to the controller to which
it is logically connected.
        
Gratuitous Probe Response (GPR)
        
The Gratuitous Probe Response feature aids in conserving
battery power of WLAN-enabled cell phones by providing
a high rate packet on the order of tens of milliseconds
such that these kind of phones can wake up and wait at
predefined intervals, to reduce battery power.  The 
GPR packet is transmitted from the AP at a predefined
time interval.
        
        
Light Weight Access Point Protocol ( LWAPP )
        
This is a generic protocol that defines the 
communication between the Access Points and the
Central Controller. 
        
Mobile Node ( MN )
        
A roaming 802.11 wireless device in a wireless
network associated with an access point. Mobile Node 
and client are used interchangeably. 
        
TU
        
A measurement of time in units of 1024 microseconds.
        
User Priority ( UP )
        
Specifies a the priority rules in QOS for handling user 
priority.
        
EDCA (Enhanced distributed channel access)
        
As defined in 802.11e standard, Enhanced distributed
channel access(EDCA) parameter set element is used 
by the AP to establish policy, to change policy when
accepting new clients, or to adapt to changes in 
offered load. 
        
RRC (Resource Reservation Control)
        
Wireless LAN Controller will periodically send this message to 
AP in order to collect various radio and client statistics, which
will be feed in to RRC algorithm. This message will be sent per access
class (i.e. 802.11 band) at the time of admission and re-RRC calculations. 
        
REFERENCE
        
[1] Wireless LAN Medium Access Control ( MAC ) and
Physical Layer ( PHY ) Specifications
        
[2] Draft-obara-capwap-lwapp-00.txt, IETF Light 
Weight Access Point Protocol