Layer 3 Messages

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1. Paging Messages

1 1. 2. 3. 2 1. 2. 3

2. System Info Messages

1IDLE MODE Informations

1. 2. 3. 4. 5.

2DEDICATED MODE Information

1. 2.

3. Call Processing Messages

1

2 3

Other L3 Messages

Created by Jayadevan.N

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Paging Type 1 2 TMSI Combination

1 TMSI & 1 IMSI Combination 2 IMSI Combination

Paging Type 2

2 TMSI & 1 IMSI Combination 3 TMSI Combination Paging Type 3 System Info 1 System Info 2 System Info 3 System Info 4 System Info 13 System Info 5 System Info 6 MS Originated Call MS Terminated Call

Location Updating Procedure

Channel Request for LU [email protected]

Location Update Request www.adacellworks.com

Location Update Accept

Immediate Assignment Extended Disconnect due to No Circuits Disconnect Normal Cause Release

Release Complete Channel Release

Sync Channel Information Measurement Report Classmark Enquiry Classmark Change

Channel Request for Call Re-establishment Immediate Assignment for Call Re-establishment CM Re-establishment Request

CM Service Reject CM Service Accept Cell Broadcast Page Channel Mode Modify

Channel Mode Modify Acknowledge

* Links are provided for every

messages. To view the detailed L3 Messages click

the messages.

Note: This is just a tutorial material for Layer 3 messaging and call flow. These contains messages which we encounter in normal RF scenarios, All the messages specified in GSM TS

4.08 is not covered. All the messages are taken from TEMS 4.1.1 version.

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Created by Jayadevan.N

[email protected] www.adacellworks.com

* Links are provided for every

messages. To view the detailed L3 Messages click

the messages.

Note: This is just a tutorial material for Layer 3 messaging and call flow. These contains messages which we encounter in normal RF scenarios, All the messages specified in GSM TS

4.08 is not covered. All the messages are taken from TEMS 4.1.1 version.

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Note: In this presentation the BTS & BSC is considered together as BSS part.

MOBILE ORIGINATED CALL

MS

BSS

Complete Layer 3 Info

Cipher Mode CMD

Cipher Mode Complete

Assignment Request

Assignment Complete

Address Complete Message (ACM)

Answer Signal/Answer Message (ANM)

MOBILE TERMINATED CALL

MS

BSS

MSC/

VLR

Channel Request Immediate Assignment CM Sevice Request Authentication Request Authentication Response Ciphering Mode Command

Cipher Mode Complete Setup Identity Request Identity Response Call Proceeding Assignment Command Assignment Complete

Initial Address Message

Alerting Connect Connect Acknowledge

MSC/

VLR

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Provide Roaming Number Roaming Number

Paging Command

Complete Layer 3 Info Cipher Mode CMD

Cipher Mode Complete

Assignment Request

Assignment Complete

LOCATION AREA UPDATING

MS

BSS

Initial Address Message

Paging Channel Request Immediate Assignment

Paging Response

Ciphering Mode Command Ciphering Mode Complete

Identity Request Identity Response Setup Call Confirmed Assignment Command Assignment Complete Alerting Connect Connect Acknowledge

MSC/

VLR

Channel Request Immediate Assignment Location Update Request

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Complete Layer 3 Info

Send Authentication para Authentication Para

Update Location Insert Subsciber data Sub data insertion acc Location Update Accept

Authentication Request Authentication Response

TMSI Realloc Command TMSI Realloc Complete Location Update Accept

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HLR

PSTN

HLR

PSTN

Send Routing Info

Click to return to main page

Initial Address Message (IAM)

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Routing Information

HLR

Initial Address Message (IAM)

old

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Cancel Location Loc cancell accept

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Paging Message Type 1 (2 TMSI Combination)

Brief Idea: Generally 3 types of Paging messages. 1. Paging Message Type 1

Contains Paging for Max 2 mobiles, with IMSI or TMSI

2. Paging Message Type 2

Contains Paging message for 3 mobiles. 1 IMSI and the other 2 or 1 TMSI

Contains only 4 TMSI's.

Paging Message Type 1 (1 TMSI & 1 IMSI Combination)

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Paging Message Type 2 (2 TMSI & 1 IMSI Combination)

Paging Message Type 2 (3 TMSI Combination)

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Brief Idea: Generally 3 types of Paging messages. 1. Paging Message Type 1

Contains Paging for Max 2 mobiles, with IMSI or TMSI

Contains Paging message for 3 mobiles. 1 IMSI and the other 2 or 1 TMSI

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System Info 1 ( Idle Mode)

Note:

This message normally for the Cell channel Informations. This will give the no of frequencies allocated for the particular cell. In hopping case this will indicate the frequencies in the MAL list along with the BCCH frequency. In non hopping case will indicate the TCH & BCCH frequencies.

This message gives the information about the neighbor frequencies in the idle mode. Will only gives the BCCH of the neighbors defined. And the NCC permitted parameter allows the mobile to restrict the neighbors to be sent in the measurement report.

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Note:

System Info 5 ( Dedicated Mode)

Note:

This message gives the information about the CBCH for the mobile to decode the CBCH. Along with the other cell level details like LAC, RACH control parameters etc…..

This message gives the information about the neighbor frequencies in the dedicated mode. Will only gives the BCCH of the neighbors defined.

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System Info 6 ( Dedicated Mode)

System Info 13 ( Idle Mode, GPRS Information)

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This message normally for the Cell channel Informations. This will give the no of frequencies allocated for the particular cell. In hopping case this will indicate the frequencies in the MAL list along with the BCCH frequency. In non hopping case will indicate the TCH & BCCH frequencies.

This message gives the information about the neighbor frequencies in the idle mode. Will only gives the BCCH of the neighbors defined. And the NCC permitted parameter allows the mobile to restrict the neighbors to be sent in the measurement report.

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This message gives the information about the CBCH for the mobile to decode the CBCH. Along with the other cell level details like LAC, RACH control parameters etc…..

This message gives the information about the neighbor frequencies in the dedicated mode. Will only gives the BCCH of the neighbors defined.

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1. Channel Request 2. Immediate Assignment 3. CM Service Request go back go back go back

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5. Authentication Response

6. Ciphering Mode Command

7. Ciphering Mode Complete

8. Setup

Point 2:

In this message only the mobile forward the called number to the system. go back

go back

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9. Identity Request 10. Identity Response 11. Call Proceeding go back go back go back

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12. Assignment Command 13. Assignment Complete 14. Alerting 15. Connect go back go back go back go back

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Point 1

Once the Mobile sends the RACH it tries to decode all the AGCH information and waits for the Immediate assignment targeted to the particular mobile. It is being identified from the Establishment cause and Random reference.

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1. Paging to the MS 2. Channel Request 3. Immediate Assignment go back go back go back

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4. Paging Response

5. Ciphering Mode Command

go back

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6. Ciphering Mode Complete 7. Identity Request 8. Identity Response go back go back go back

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9. Setup 10. Call Confirmed 11. Assignment Command go back go back go back

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12. Assignment Command 13. Alerting 14. Connect 14. Connect Acknowledge go back go back go back go back

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SMS Request

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System Info 5 for the following Handover process

Measurement Report 1

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Handover Command

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Physical Information

Handover Complete

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Channel Request

Immediate Assignment

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Authentication Response

TMSI Reallocation Command

TMSI Reallocation Complete

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go back

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go back

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Channel Request for Location Updating

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DL Disconnect due to NO circuits

DL Disconnect Normal Cause

Release

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Channel Release

Sync Channel Information

Measurement Report

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Location Updating Accept

Classmark Enquiry

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Channel Request for Call re-establishment

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CM Service Reject

CM Service Accept

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Channel Mode Modify

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Note:

This is scheduled to allocate SDCCH for 2 mobiles simultaneously.

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Note

In dedicated mode or group transmit mode, higher layers can request the setting of the channel mode.The channel mode modify procedure allows the network to request the mobile station to set the channel

mode for one channel. The channel mode covers the coding, decoding and transcoding mode used on the

indicated channel.