The DPCCH is a physical channel in 3G WCDMA networks used to transmit layer-1 control data. It carries essential operational metrics like pilot bits for channel estimation, transmit power control (TPC) commands, and feedback information. By keeping this control data separate from user payloads, the network can maintain precise synchronization and rapidly adjust handset transmission power to minimize interference.
The handset dropped the call because it stopped receiving TPC commands on the DPCCH.
Related terms
DPCH
Dedicated Physical Channel is the combined radio link carrying both user data and control signaling for a specific mobile user.
DPDCH
Dedicated Physical Data Channel is a UMTS radio channel carrying user payload.
UMTS
A third-generation cellular standard based on wideband code division multiple access.