Cisco Cisco Access Registrar 4.2 Especificaciones descargar pdf (Pagina 446)

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Cisco Wireless LAN Controller Configuration Guide

OL-13826-01

Chapter 10 Configuring Radio Resource ManagementWireless Device Access

Overview of Radio Resource Management

The controller combines this RF characteristic information with RRM algorithms to make system-wide

decisions. Conflicting demands are resolved using soft-decision metrics that guarantee the best choice

for minimizing network interference. The end result is optimal channel configuration in a

three-dimensional space, where access points on the floor above and below play a major factor in an

overall wireless LAN configuration.

Dynamic Transmit Power Control

The controller dynamically controls access point transmit power based on real-time wireless LAN

conditions. Normally, power can be kept low to gain extra capacity and reduce interference. The

controller attempts to balance access points such that they see their fourth strongest neighbor at an

optimal –65 dbm or better.

The transmit power control algorithm only reduces an access point’s power. However, the coverage hole

algorithm, explained below, can increase access point power, thereby filling a coverage hole. For

example, if a failed access point is detected, the coverage hole algorithm can automatically increase

power on surrounding access points to fill the gap created by the loss in coverage.

Note See Step 4 on page 10-26 for an explanation of the transmit power levels.

Coverage Hole Detection and Correction

RRM’s coverage hole detection feature can alert you to the need for an additional (or relocated)

lightweight access point. If clients on a lightweight access point are detected at signal-to-noise ratio

(SNR) levels that are lower than the thresholds specified in the Auto RF configuration, the access point

sends a “coverage hole” alert to the controller. The alert indicates the existence of an area where clients

are continually experiencing poor signal coverage, without having a viable access point to which to

roam. The administrator can look up the historical record of access points to see if these alerts are

chronic, indicating the existence of a persistent coverage hole as opposed to an isolated problem.

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