9.Call Process | Communication | Telecommunications

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Call Processs..
  Call Process  Introduction Though basically similar, the call process of mobile subscribers and that of ordinary fixed subscribers are different in the following aspects: ã Before a mobile subscriber srcinates a call, he should first input the number, ensure that no modification is needed, and then send the call. ã Before the number is sent out and the call is connected, there is some additional information that should be transferred between mobile stations (! and the networ#. !uch operations are automatically performed by the e$uipment, with no need for user interference, but it results in a certain delay.  Initiali%ation (& ãInitialization is a random access process. It starts from MS which sends a “channel request” message on RAC. ãAfter recei!ing this message #$S notifies #SC and attaches #$S%s estimation of the transmission dela& '$A( from this MS to #$S and the cause for the current access. ã#SC will select an idle and dedicated channel S)CC to notif& #$S to acti!ate it according to the access cause and the current information.  Initiali%ation (' ãAccess causes mainl& include* location updating+ response to a paging call+ and su,scri,er ser!ice application such as a call sending one short message.ãAfter #$S completes the acti!iation of the designated channel #SC sends the “immediate allocation”message on A-C !ia #$S including the description of the S)CC channel assigned ,& #SC to MS $A the maimum initialization transmission power and the access random reference !alue.
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