Transmission power levels of uplinkdownlink communication is controlled in a wireless communication system. If required service flow attributes, as determined from the SDP of the SIP message, matches service flow attributes of an existing UGS service flow with a CMTS, a DOCSIS Dynamic Service Change request is used to add an additional sub flow to the existing UGS service flow. The methods can involve cold stretching the films and imparting rib patterns into the film. The diaphragm valves and the outlet valves are commonly operated via respective pneumatic actuators.