Method for solving problem of coverage distance limitation of DMR communication system

The invention discloses a method for solving a problem of coverage distance limitation of a DMR communication system, and relates to the field of mobile communication. The method is implemented by the following steps: 1) calculating starting time of receiving time slots through frame synchronization; 2) calculating a time slot delay error; 3) comparing with a deviation threshold value preset in a base station to judge whether the delay is within a range allowed by a system; 4) if the delay is within the range allowed by the system, not performing time slot adjustment; and 5) if the delay exceeds the preset threshold value, adjusting the time slot in the system, setting a stepping adjustment value, sending to a terminal through downlink signaling, adjusting by the terminal according to the stepping adjustment value, and moving the position of the time slot starting time forward or backward. The method solves the problem of ultra-distance communication of a DMR digital trunking system, and can effectively ensure the establishment of communication for ultra-distance terminal users; the system communication coverage range is improved; and the network construction cost can be reduced, and a problem of time slot collision due to ultra distance and clock drift can be simultaneously corrected.