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Chapter 4 North American Intersystem Operations

Chapter 4 North American Intersystem Operations. Architecture. TIA IS-41 (Telecommunications Industry Association Interim Standard 41 )- an open communications interface between a pair of AMPS systems IS-41.1-B: Functional Overview IS-41.2-B: Intersystem Handoff

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Chapter 4 North American Intersystem Operations

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  1. Chapter 4North American Intersystem Operations Peter Yeh

  2. Architecture • TIA IS-41 (Telecommunications Industry Association Interim Standard 41)- an open communications interface between a pair of AMPS systems • IS-41.1-B: Functional Overview • IS-41.2-B: Intersystem Handoff • IS-41.3-B: Automatic Roaming • IS-41.4-B: Operations, Administration and Maintenance • IS-41.5-B: Data Communications Peter Yeh

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  6. Automatic Roaming • Mobility Management • Mobility management procedures begin when a system detects the presence of a visiting terminal (refer to Figure 4.4). • Authentication • Authentication begins with a Qualification Request Invoke message initiated by the serving VLR (refer to Figure 4.4). • Call Management • Call management begins when someone dials the cellular phone number of the roaming subscriber (refer to Figure 4.5). Peter Yeh

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  9. Call Management • The other conditions covered in Figure 4.6 are: • Delivery of call waiting service to a busy subscriber • Forwarding a call when the subscriber does not respond to an incoming call • Transmitting an announcement to the calling party when the subscriber does not respond • Unconditional call forwarding to another telephone number Peter Yeh

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  11. Intersystem Handoff • The status of MSCs • Anchor MSC • Serving MSC • Candidate MAC • Target MAC • Handoff Categories • Handoff Forward • Handoff Back • Handoff to third Peter Yeh

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  16. Handoff Forward • The serving MSC sends Facilities Directive Invoke message to the target MSC. • If the target MSC accepts the handoff, it selects a channel to handle the call in the new cell and then sends Facilities Directive Result message to the serving MSC. Peter Yeh

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  18. Handoff Back • If the location phase results in a determination by the serving MSC that the call would best be handled in the system previously occupied by the terminal, the serving MSC initiates a handoff back procedure. Peter Yeh

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  20. Handoff to Third • Handoff to third is an example of a path minimization procedure, in which the system reduces the number of voice trunks carrying a call through three or more systems Peter Yeh

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  22. Status of IS-41 • IS-41B (since 1991) • Is in wide-spread use in the USA and Canada. • IS-41C (since 1997) • For roaming calls to use the network operations defined in the TDMA and CDMA. • IS-136 (TDMA) • IS-95 (CDMA) Peter Yeh

  23. Review Exercises • Why is a cellular phone capable of operating with more than one telephone number? • During a phone call, explain the conditions that cause a mobile switching center to perform each of the following functions: • Anchor MSC, Serving MSC, Candidate MAC and Target MSC • Why does IS-41 specify three different handoff procedures? Peter Yeh

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