sim808 gsm location

hello all
when i use sim808 module to get location from gsm,the location is incorrect and 100 to 200m far from me
i want to fix location, please help me.
thanks a lot

please help me

post up your code showing us what you've tried so far, then we might take it from there

i use AT commands:

AT+SAPBR=3,1,"Contype","GPRS"

OK

AT+SAPBR=3,1,"APN","mtnirancell"

OK

AT+SAPBR =1,1
OK

AT+SAPBR=2,1
+SAPBR: 1,1,"100.120.204.132"
OK

AT+CIPGSMLOC=1,1
+CIPGSMLOC: 0,78.151830,15.958542,2017/07/16,18:07:47
OK

and when i use latitude and longitude,google map show location 100m to 200m far from me location!!!
please help me to solve this problem!

coordinates your getting are for the cell tower 'serving' your gsm module (not for the module itself) , and don't even expect any results accurate than that, your lucky with that 200m accuracy, which can go upto 500m or so

you might want to go for gps(those with high accuracy)

thanks for reply,
but i want to get my location in the inside of building or roof
gps could not solve this solution.

what's the another way to solve this solution?