Calculation of S

Calculation of S

     

When T becomes larger, the interval range between channel request messages sent by MS will increase and RACH collisions will be reduced. When value S becomes larger, the interval between channel request messages sent by MS will increase, collisions on RACH will be reduced and the availability of AGCH and SDCCH will increase. But the increase of both will prolong the access duration of MS, resulting in deterioration of access performance of the entire network. Generally, value T should be selected to make S as small as possible (in order to shorten MS access time), but AGCH and SDCCH must not be overloaded.