2.The initial coverage area for each cell is greatly offered by link budget.(how much loss(db)can be tolerated over the air link between the phone & base station).
3.It is having hard hand off.(break before make).
4.It cover less cell radius.
5.GSM claim 3/9 reuse pattern(theree sector base station)frequency reuse equal 9)with the use frequency hopping,it only reduces the variance of C,I doesn’t improve C/I).
6.It is more expansive.
7.GSM suffers form the band width (B.W) limitation imposed by TDMA design.(time division multiple access).