CALL PROCESSING IN CDMA :CALL PROCESSING IN CDMA Presented By: Mukesh Kumar


Session objectives: :Session objectives: Registration Call Procedure Mobile Terminated Call Mobile Originated Call


Registration :Registration Process by which an idle mobile lets the system know it’s awake. Registration allows mobile’s home switch to know mobile’s current location so that i/c calls can be delivered. Registration allows the system to page MS only in the area where the MS is currently located, to eliminate congestion on PCHs. Registration message(By probing) Base station ack. order


Types Of Registration :Types Of Registration Power ON When MS is turned ON Power OFF Just before MS is turned OFF Timer Based After a certain timer expires Distance based If MS moves to the further cell Zone Based If MS moves in or out of the zone Ordered BS requests the registration Parameter change If MS parameters change Implicit BS infers the MS position Traffic channel For registration in active mode First 5 are autonomous type of registration, BS informs MS at power on to resister if any of the event occur.


Local Registration :Local Registration Registration message Location update request Location update accepted Registration accept order MS BTS MSC


States of call :States of call Power-Up Mobile Station Initialization Mobile Station Idle State System Access State MS Control on Traffic Channel State Synch Channel MSG Received Pilot Channel Acquired MS Acquires System Timing Directed to Traffic Channel End Use of Traffic Channel Receives Page Originates, or Registers Unable to receive Paging Channel Message Receipt of Acknowledgement to other than Origination or Page Response message.


Slide 7:States Of Call Initialization State System determination sub state Pilot channel acquisition sub state Sync channel acquisition sub state Timing change sub state 2. Idle state Paging channel monitoring Idle handoff 3. Access state 4. Traffic channel state Update overhead information Page response Mobile station origination attempt Registration access Mobile station order/message response Mobile station message transmission Voice as well as signaling Voice frames vary depending on the vocoder rate Blank and burst is all signaling data only


Slide 8:MSC BSC BTS PAGING ACCESS PAGING TRAFFIC CHANNEL Receiving an incoming call Page message is sent on PCH MS responds on Access channel Channel assignments on paging Mobile gets a traffic channel


Slide 9:Paging channel MS Access channel Forward Traffic channel Reverse Traffic channel Base station ack. order Channel assignment message General page message Continuous frames of all 000’s Base station ack. order Service connect message Page response message Traffic channel preamble: Frame of 000’s Mobile station ack. order Service connect complete message Mobile Terminated Call


MTC/MOC :MTC/MOC 10


Slide 11:Paging channel MS Access channel Forward Traffic channel Reverse Traffic channel Base station ack. order Channel assignment message Continuous frames of all 000’s Base station ack. order Service connect message Origination message(By probing) Traffic channel preamble: Frame of 000’s Mobile station ack. order Service connect message complete Mobile Originated Call


Slide 12:THANK YOU