The max. SMS load for Nokia 3i series is
1 request/subscriber/1 hour
Now the number of subscribers can be calculated m.Erlang/sub. .suppose it is 12.0 m.Erlang/sub.Now see the Erlang capacity of BSC .suppose it is 1200 Erlang.Now divide the Erlang capacity of BSC with milli erlang/sub.This will give no. of subscibers. in our case it is 100000.So answer is 100000 requests/ 1 Hour.
Hope i solved your query.
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When no TCH is allocated for the MS (idle) then the SDCCH channel will be used for the SMS transfer.
Whenever a TCH and associated SACCH are assigned to the MS (busy) then the SACCH will be used for the SMS.