Dynamic MBSFN decision method and device based on mobile network

The invention relates to a dynamic MBSFN decision method and device based on a mobile network. The decision method comprises the following steps: 1. the MBMS user in the local cell is detected to obtain the total number of MBMS users in the local cell; if the total number is more than 0, the step 2 is executed, if the total number is equal to 0, the step 3 is executed; 2. if the adjacent cell turns on an MBSFN, the local cell turns on an MBSFN, the MBMS users in the local cell of which signal-to-noise ratios are lower than the signal-to-noise ratio threshold are detected to obtain the number of the MBMS users with signal-to-noise ratios lower than the threshold; if the adjacent cell turns off the MBSFN, the local cell adopts single-cell mode to perform MBMS transmission; and 3. E-Node B decides whether the local cell turns on or off the MBSFN according to the received total number of MBMS users in the adjacent cell and the number of the MBMS users with signal-to-noise ratios lower than the threshold. The meth