Your Trusted ICT Solutions & Services Partner
The "2+4" converged solution is the industry's first narrowband-broadband converged architecture, launched by Caltta in 2014. It unifies DMR (narrowband) + LTE (broadband) networking to carry both mission-critical voice and broadband data. DMR ensures full-area voice coverage while LTE provides multimedia capabilities in key zones, with a unified core network enabling cross-network interworking and one dispatch platform for unified command.
The solution has successfully safeguarded the Beijing 2022 Winter Olympics, the 19th Asian Games and other major events, and is commercially deployed across 50+ cities in China — a benchmark for narrowband-broadband converged communications.
A unified core network converges narrowband and broadband base stations, flexibly accessing multiple terminals for integrated command:
The industry's first large-scale 2G+4G converged private network commercialization, with "2G+4G" call setup latency <300ms, covering the O&M center, game venues and Olympic village — highly praised by the Organizing Committee.
50 LTE eNBs + 100 PDT sites, 10,000 LTE terminals, serving the National Games and urban emergency response with a converged core network and converged command & dispatch.
Around 200 LTE eNBs and tens of thousands of terminals, fully covering cities, main roads and key areas, providing multimedia PTT, wireless HD backhaul, mobile office and emergency coalition.
Deployed across Shandong, Guangxi, Yunnan, Gansu, Hebei, Jiangsu and more provinces, applied to daily policing, e-government and major event guarantee.