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Wireless Telecommunications Network Reference Models
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Wireless Telecommunications Network Reference Models
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AC BS CSC EIR HLR ISDN IWF MC MS MSC NPDB OTASP PPDN PSTN SME VLR
authentication center base station customer service center equipment identity register home location register integrated services digital network interworking function message center mobile station mobile switching center number portability database over-the-air service provisioning function public packet data network public switched telephone network short message entity visitor location register
Figure 47 The current ANSI-41 network reference model (from TIA Subcommittee TR452) The interfaces in bold represent the interfaces that are standardized in ANSI-41
Public packet-switched data network interconnectivity is designed to support a circuit-switched to packet-switched interworking function
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Wireless Telecommunications Network Reference Models
Part 1:
Introduction to Wireless Telecommunications
(IWF) enabling packet data protocol services to be provided to wireless subscribers Examples of these services are wireless Internet connectivity that supports wireless Web browsing and a variety of other Internetbased services that are more commonly available from desktop wireline connected computers today The MSC is essentially a telecommunications circuit switch and is typically not designed for packet-switched data services The IWF enables the MSC to act as a packet switch Number Portability Database The number portability database (NPDB) is standardized in TIA/EIA/IS-756 The NPDB is a repository that supports delivery of calls to ported directory numbers, ones originally owned and administered by a wireless or wire-line service provider and now belonging to subscribers using another wireless or wire-line service provider Over-the-air Service Provisioning Function The over-the-air service provisioning function (OTASP) is a functional entity that interfaces with one or more customer service centers (CSCs) to support service provisioning activities The OTASP interfaces with the MSC to send mobile station orders necessary to complete service provisioning requests As a logical functional entity, the OTASP can be a separate physical entity or may be located within and be indistinguishable from an HLR or message center (MC) The OTASP employs ANSI41 short message service operations to transfer subscriber provisioning information between the serving VLR and the HLR to support the new subscription Customer Service Center The customer service center (CSC) is a functional entity where the service provider receives information (typically in the form of a telephone call) from a new customer wishing to subscribe to wireless service or to request changes in the existing service The CSC uses completely proprietary and implementation-dependent interfaces to the OTASP to perform network and mobile station related changes necessary to accomplish the service provisioning process Public Packet Data Network The public packet data network (PPDN) is the functional entity that represents a network completely separate from the wireless telecommu-
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Wireless Telecommunications Network Reference Models
4:
Wireless Telecommunications Network Reference Models
nications network It refers to a packet-switched data network that provides packet-data services over special data links to digital terminals The PPDN is commonly accessed by digital data terminals, for example, a mobile station (eg, TDMA, CDMA, or other digital packet data protocol), a wireless desktop client (eg, a personal computer), a personal data assistant, or any other device capable of sending and receiving packet-switched data The most common realization of a PPDN today is the Internet, whose underlying network protocol is the packet-switched Internet protocol (IP) The interface between the MSC and the PPDN represents the capabilities to originate packet-switched data transmission from wireless phones to destinations within the PPDN (eg, the Internet) and to terminate packet-switched data transmission from the PPDN to wireless phones Interworking Function The interworking function (IWF) is the functional entity that provides protocol conversion between any two wireless network functional entities The definition in ANSI-41 is broad, but typically the IWF supports conversion between circuit-switched transmission protocols and packetswitched transmission protocols The IWF is sometimes necessary to support transmission between a packet-switched network entity (eg, an IP router) and a circuit-switched network entity (eg, an MSC) One of the primary functions of an IWF can be to enable the support of packet data to circuit-based devices (such as mobile stations designed primarily for voice telephony services) and circuit data (such as voice telephony) to packet data-based devices (such as voice-over-IP terminals)
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