Hi Krish
Each time MS re-transmits the channel request request message,it means that T3101 timer was expired and the SDCCH assigned by immediate assignment was released.So,if you set max no. of re-transmissions to 7,and if the immediate assignment succeeds after 6-7 attempts it means that in that particular cell SDCCH holding time increases by{T3101 X(6 or 7)}=18 to 21ms per channel request which is very high for High traffic cells