H
ELECTRICITY
H
ELECTRICITY
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04
ELECTRIC COMMUNICATION TECHNIQUE
H04W
WIRELESS COMMUNICATION NETWORKS
H04W
WIRELESS COMMUNICATION NETWORKS
H04W4/00
Services specially adapted for wireless communication networks; Facilities therefor
H04W4/00
Services specially adapted for wireless communication networks; Facilities therefor
H04W4/20
Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
H04W4/20
Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel