Call Management

CALL & MOBILITY MANAGEMENT

Connection Management
What is Connection Management ? Connection Management enables different CM sub-layer entities to communicate with their pier entity using different MM connections. Different CM sub-layer entities use different MM connections. Different MM connections are identified by Protocol Discriminator PD and, additionally by Transaction Identifier TI.

Mobile To Land Call Set-up Scenario Phases of Mobile To Land Call ( Mobile Originated Call- MO Call )

• SETUP PHASE • RINGING PHASE • CONVERSATION PHASE • RELEASE PHASE

Mobile To Land Call Set-up Scenario

• SETUP PHASE
- REQUEST FOR SERVICE ( CHANNEL ) BY MS - CM SERVICE REQUEST - AUTHENTICATION - CIPHERING - EQUIPMENT VALIDATION ( EIR CHECK ) - SETUP MESSAGE - VALIDATION AT VLR - ASSIGNMENT

MOBILE TO LAND CALL - I Request For Service
MS BSS MSC/ VLR

1

Channel Request

RACH
2

SDCCH Assignment

AGCH
3

CM Service Request

SDCCH
4

CM Service Accept

Mobile To Land Call Set-up Scenario • CM SERVICE REQUEST - The Call Control (CC) entity of MS initiates the establishment of CC connection by requesting MM sub-layer of the mobile to establish MM sub-layer connection. - Upon establishment of MM connection CM SERVICE ACCEPT message is received from n/w. • SETUP MESSAGE - CC entity sends a setup message to its peer entity.

MOBILE TO LAND CALL - II Call Setup
MS BSS MSC/ VLR

5

Call Setup Request

SDCCH
Call Proceeding
6

SDCCH Assign Trunk and radio
7

Assign TCH

SDCCH Radio Assignment Complete SDCCH Trunk and Radio Assignment Complete

Mobile To Land Call Set-up Scenario Call Setup message
MSC/VLR Release Complete message to MS No

Is the requested basic service provisioned for the subscriber ?
Yes

Release Complete message to MS Yes

Preliminary Digit Analysis
Is the number of digits less than the minimum expected? No 1. Check of ODB( BAOC/BOIC/ BOIC Ex HC )

2. Subscriber call barring checks (