M900/M1800 Base Station Subsystem Signaling Analysis Manual Contents

Issue 02 (2007-06-30) Huawei Technologies Proprietary i

Contents

5 Classmark Update Procedure...................................................................................................5-1 5.1 Classmark Overview .....................................................................................................................................5-2 5.2 Classmark Update Procedure ........................................................................................................................5-2

Figures M900/M1800 Base Station Subsystem

Signaling Analysis Manual

ii Huawei Technologies Proprietary Issue 02(2007-06-30)

Figures

Figure 5-1 Classmark update procedure.............................................................................................................5-2

M900/M1800 Base Station Subsystem Signaling Analysis Manual 5 Classmark Update Procedure

Issue 02 (2007-06-30) Huawei Technologies Proprietary 5-1

5 Classmark Update Procedure

About This Chapter

The following table lists the contents of this chapter.

Section Describes

5.1 Classmark Overview The function of the classmark and the relevant GSM protocols.

5.2 Classmark Update Procedure

The classmark update procedure and the relevant functions of the signaling.

5 Classmark Update Procedure M900/M1800 Base Station Subsystem

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5.1 Classmark Overview Classmark specifies the service capability, supported frequency bands, power capability, and encryption capability of an MS in the Global System for Mobile communications (GSM). The classmark of an MS can be classified into classmark 1, classmark 2, and classmark 3. The network can identify the capabilities of an MS by querying its classmark. The network can also request an MS to report its classmark 3 by setting the Early Classmark Sending Control (ECSC) parameter once the connection between an MS and the network is established.

Because the main information in classmark 3 applies to dual-band networks, the GSM equipment should support the processing of MS classmarks.

Huawei's GSM equipment can process the ECSC and classmark 3 of an MS.

For details about the classmark update procedure, refer to GSM Rec. 04.18.

5.2 Classmark Update Procedure

Signaling Procedure Figure 5-1 shows the classmark update procedure. :

Figure 5-1 Classmark update procedure

MS MSCBSS

System InformationType 3

ECSC BCCH

SABM Complete Layer 3Inforamtion

Classmark Change(1)

Classmark Change(5)

Classmark Update(2)

Classmark Request(3)Classmark Enquiry(4)

Classmark Update(6)

main DCCH

main DCCH

SDCCH

SDCCH

If the ECSC is allowed in System Information Type 3, an MS (dual-band MS or vehicle mounted MS) can initiate a classmark update procedure by sending a Classmark Change message on the dedicated channel allocated by the network. The Classmark Change message contains the updated classmark 2 information element of the MS. It may also contain a classmark 3 information element.

M900/M1800 Base Station Subsystem Signaling Analysis Manual 5 Classmark Update Procedure

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Step 1 Upon receipt of the Classmark Change message from the MS, the BSS sends a Classmark Update message. This message contains classmark 2 information element and classmark 3 information element of the MS. The Classmark Update is a bi-directional message.

Step 2 When a Mobility Management (MM) connection is established between the MS and the MSC, the MSC can initiate a classmark update procedure by sending a Classmark Request message on the Signaling Connection Control Part (SCCP) to the BSS.

Step 3 Upon receipt of the Classmark Request from the MSC, the BSS either takes no action or takes the following actions:

Sends a Classmark Update message to the MSC Sends a Classmark Enquiry message to the MS

Step 4 Upon receipt of the Classmark Enquiry message from the BSS, the MS returns a Classmark Change message to the BSS. The Classmark Change message contains the updated classmark 2 message of the MS. It may also contain the classmark 3 message.

Step 5 Refer to Step 1.

----End

Procedure Explanation Figure 5-1 is divided into the following three parts by the broken lines:

The upper section defines whether the ECSC is supported in System Information Type 3. The middle section shows the classmark update procedure initiated by the MS when the ECSC is enabled. :

The lower section shows the classmark update procedure initiated by the MSC.