Configuring AP Timer:
Some advanced timer configuration for HREAP and local mode is available for the controller on WCS. Follow these steps to configure a template for advanced timers.
Step 1 Choose Configure > Controller Template Launch Pad.
Step 2 Click AP Timers or choose System > AP Timers from the left sidebar menu. The System > AP Timers page appears, and the number of controllers and virtual domains that the template is applied to automatically populates. The last column indicates when the template was last saved. The Applied to Controllers number is a link. Clicking the number opens an Applied to Controllers page, which displays the controller name and IP address to which that template is applied, as well as the time it was applied and its status. The Applied to Virtual Domains number is also a link. Clicking this link opens an Applied to Virtual Domains page that shows all partition names. Step 3 To reduce the controller failure detection time, click Local Mode (see Figure 12-8). You can configure the fast heartbeat interval (between the controller and the access point) with a smaller timeout value. When the fast heartbeat timer expires (at every heartbeat interval), the access point determines if any data packets have been received from the controller within the last interval. If no packets have been received, the access point sends a fast echo request to the controller. You can then enter a value between 1 and 10 seconds.
Please check the below link for configuration,
http://www.cisco.com/en/US/docs/wireless/wcs/7.0/configuration/guide/7_0temp.html#wp1299354
