The CDMA network uses base transceiver stations (BTS) with cells for each BTS.
Throttling occurrs on the number of concurrent connections per BTS/cell. GXF offers a throttling service that hands out permits per BTS/cell while maintaining the configurable limit.
An application will typically use this service like this:
SMS can be used to wake up certain types of devices. Throttling in this context means limiting the number of messages per second to a configurable rate.