TABLE OF CONTENTS Only a short overview will be given of the CN protocols in the air interface. This is because these protocols already exist in the GSM/ GPRS system and they can be studied in other sources. A classic GSM reference book is [2]. Other useful GSM publications include [3-5].
As the name of this task states, one of the main functions of the mobility management (MM) tasks is location management. But the MM tasks have also been assigned network-registration and security functions. Typically the MM procedures can be divided into three groups:
MM common procedures;
MM-specific procedures;
MM connection-management procedures.
The MM common procedures can always be initiated while an RRC connection exists. The procedures belonging to this type fall into two classes determined by what entity initiates them:
TMSI reallocation procedure;
Authentication procedure;
Identification procedure;
MM information procedure;
Abort procedure.
IMSI detach procedure.
An MM-specific procedure can only be initiated if no other MM-specific procedure is running or no MM connection exists. The procedures belonging to this type include:
Normal location updating procedure;
Periodic updating procedure;
IMSI attach procedure.
The MM connection-management procedures are used to establish, maintain, and release an MM connection between the mobile station and the network, over which an entity of the upper CM layer can exchange information with its peer. An MM connection establishment can only be performed if no MM-specific...
