The simulcast network is flexible, reliable and convenient. It brings the advantages of resources saving, seamless roaming and it easily extends its network to cover any blind areas. Deploy several same-frequency repeater base stations at the operating field and connect them by links; the coverage problem is then effectively solved. When carrying out a vital task, the command center can quickly connect all the base stations, bringing all the communications from different sub-areas onto the same page. Thus, everyone within the system is well connected and dispatchable.