LTE investment accounted for 44 percent of total growth in the mobile infrastructure market in the third quarter of 2011, according to market research firm Dell’Oro Group. The total mobile infrastructure market grew by 15 percent year-on-year with the quarter seeing the first significant revenues derived from voice-over-LTE services. "The wireless industry is responding to changes in user behaviour and accelerating data demand by shifting priorities towards Evolved Packet Core, voice-over-LTE and LTE radio equipment," Dell'Oro Group analyst Chris DePuy said.