Global Digital Mobile Radio (DMR) Market, By Tier (Tier1 (Unlicensed), Tier 2 (Conventional), Tier 3 (Trunked)), Product Type (Hand Portable, In-Vehicle [Mobile]), Frequency (25–174 MHz, 200–512 MHz, >700 MHz), Industry Vertical (Commercial, Aerospace and Defence, Transportation, Oil and Gas, Mining, Automotive, Industrial, Others), Country (U.S., Canada, Mexico, Brazil, Argentina, Rest of South America, Germany, Italy, U.K., France, Spain, Netherlands, Belgium, Switzerland, Turkey, Russia, Rest of Europe, Japan, China, India, South Korea, Australia, Singapore, Malaysia, Thailand, Indonesia, Philippines, Rest of Asia-Pacific, Saudi Arabia, U.A.E, South Africa, Egypt, Israel, Rest of Middle East and Africa) Industry Trends and Forecast to 2028