From GPRS: General Packet Radio Service
When you complete the reading in this chapter, you will be able to
Describe the main components of the main functions of mobility management.
Describe the mobile-initiated attach and detach procedures.
Understand when the network performs an attach or detach procedure.
Discuss the role of the SGSN in the procedures.
Understand the three states of the mobile in GPRS.
Mobility Management (MM)
Before a mobile station (MS) can send data to a corresponding host, it must attach to a Serving GPRS Support Node (SGSN). An attachment procedure (GPRS attach) between the mobile station and the network is conducted and a Temporary Logical Link Identifier (TLLI) is assigned to the mobile station. Actually, the mobile uses the TLLI after the network assigns a Packet Temporary Mobile Subscriber Identity (P_TMSI). The mobile chooses the TLLI after being assigned the P_TMSI.
After attaching, one or more routing contexts for one or more Packet Data Protocols (PDPs) can be negotiated with the SGSN. Three mobility management (MM) states are related to a GPRS subscriber and each state describes the level of functionality and information allocated.
In idle state, the mobile station is not yet attached to the GPRS mobility management and a GPRS attach procedure must be performed. The conditions of the idle state are shown in Figure 5-1 when looking at the radio resource (RR) management.
Figure 5-1: The parameters for the idle state of the mobile.
In ready state,...
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Topics of Interest
Objectives Upon completion of this chapter, you should be able to State the different air interface requirements used. Understand the resource allocation methods. Describe how the...
Objectives Upon completion of this chapter, you should be able to Understand the way the mobile station communicates with the SGSN via LLC. Discuss the ways the data protocols work at...
Objectives When you complete the reading in this chapter, you will be able to Describe the main architecture of a GPRS network. Describe the new components needed to operate a GPRS...
7.8 Core Network Protocols in the Air Interface 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...
Objectives When you complete the reading in this chapter, you will be able to Describe the main components of a GSM network. Describe the mobile services. Understand how a mobile...