Cisco Cisco Aironet 350 Mini-PCI Wireless LAN Client Adapter デザインガイド

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Enterprise Mobility 4.1 Design Guide
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Chapter 2      Cisco Unified Wireless Technology and Architecture
  LWAPP Overview
Figure 2-2
Split MAC Concept
The simple timing-dependent operations are generally managed locally on the LWAPP AP, while more 
complex, less time-dependent operations are managed on the WLC.
For example, the LWAPP AP handles the following:
  •
Frame exchange handshake between a client and AP
  •
Transmission of beacon frames
  •
Buffering and transmission of frames for clients in power save mode
  •
Response to probe request frames from clients; the probe requests are also sent to the WLC for 
processing
  •
Forwarding notification of received probe requests to the WLC
  •
Provision of real-time signal quality information to the switch with every received frame
  •
Monitoring each of the radio channels for noise, interference, and other WLANs
  •
Monitoring for the presence of other APs
  •
Encryption and decryption of 802.11 frames
(B) APs combined into an ESS
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(C) LWAPP Split-MAC ESS
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(A) Single AP