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Overview

Overview. EV-DO gaining traction in CDMA community Like all packet data services, roaming will be a critical to EV-DO Two areas important for EV-DO roaming: Operator Network interconnection Proper System Selection. References. SKT has presented EV-DO IRT contributions:

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Overview

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Presentation Transcript

  1. Overview • EV-DO gaining traction in CDMA community • Like all packet data services, roaming will be a critical to EV-DO • Two areas important for EV-DO roaming: • Operator Network interconnection • Proper System Selection

  2. References • SKT has presented EV-DO IRT contributions: • New EV-DO nomenclature • Architecture and call flow • Cited Issues: System Selection, A12, Terminal Interoperability, Billing (SO59), Fraud • Emphasized need for A12 authentication • Standards • IS-878 - Interoperability Specification (IOS) for High Rate Packet Data (HRPD) Access Network Interfaces • IS-856 - CDMA2000 High Rate Packet Data Air Interface Specification • IS-835 - Wireless IP Network Standard • IS-638-C – Includes PRL support for EV-DO

  3. Reference Architecture

  4. Operator Network Interconnection • From a roaming perspective, most issues are same as 1xRTT • New version of Document #79 will cover EV-DO • Exception is A12 authentication, which is optional • Operator consensus moving toward performing A12 authentication • Legacy Issues facing EV-DO: • CRX vs. Bilateral Interconnection • Simple IP, L2TP, or Mobile IP • Security issues: firewall configuration, etc.

  5. EV-DO System Selection Issues Overview • System Selection is already a challenge for operators • PRL construction to support roaming is complicated • Problems in PRL construction can be costly • EV-DO system selection requires a new PRL format (IS-683-C)

  6. Hybrid Mode • It’s assumed most operators will deploy EV-DO terminals configured in hybrid mode • Hybrid mode refers 1xRTT/EV-DO capable devices which select EV-DO system using associated 1xRTT systems • In Hybrid mode, 1xRTT and EV-DO system effectively assume a master/slave relationship. • The new IS-683-C format supports this implementation

  7. Conceptual Representation of a PRL Acquisition Table Acquisition Table Geo 4 Geo 3 Geo 2 Geo 1 System Table PRL review • The PRL is : • an indexed list of systems in the handset • built by an operator • a definition of systems a mobile can access • is not accessible to the user • The PRL comprises two Tables: • The Acquisition Table • The System Table • The Acquisition Table contains: • An Indexed list of RF channels to search. • Each entry describes the RF environment of a particular area. • The System Table contains: • An Indexed list of Systems, keyed by (SID, NID) pairs. • Each entry refers to a specific RF environment • Each system belongs to a geographical area • Relative Priority can be specified • Roaming display behavior can be specified • Negative (prohibited) systems can also be specified • Preferring one system over another • Preferences can exist within Geographic areas • An operator can specify preferences on which networks to access

  8. Important features of extended PRL format (IS-683-C) • New Acquisition Record Type for EV-DO/HRPD • New System Record for EV-DO/HRPD Systems • Uses Subnet instead of SID/NID • New field in System Records (ASSOCIATION_TAG) associate 1xRTT System Records with EV-DO records

  9. Basic Flow of Hybrid System Selection • Acquisition table is used to acquire system • EV-DO acquisition records are ignored until a 1xRTT system is acquired • System table is used to find highest priority system available in GEO • If the system acquired has a system whose record has an association tag for an EV-DO system, then the system will search for it and acquire it IMPORTANT POINT: The prioritization of 1xRTT system determines whether or not EV-DO systems will be acquired depending on which ones have association tags to EV-DO system

  10. My Contact Info: Bryan Cook Qualcomm Engineering Services 408-557-3516 bcook@qualcomm.com

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