Applying Lucent s CDMA Full International Mobile Station Identity (IMSI) Feature for Enhanced Preferred Roaming List (PRL)

Transcription

1 Applying Lucent s CDMA Full International Mobile Station Identity (IMSI) Feature for Enhanced Preferred Roaming List (PRL) Mike Chambers Mobility Solutions Systems Engineering February 2004 Slide 1

2 Lucent s Feature A Prerequisite for Enhanced PRL February 2004 Slide 2

3 Lucent s Feature A currently available optional feature Enhances the AUTOPLEX System 1000/FLEXENT System so that it can use up to 15 digits of an IMSI as a Mobile Station Identifier (MSID) mobiles operating in analog mode will continue to use MIN as their MSID IMSI has no direct relationship to a mobile s DN a MIN-Based IMSI begins with a MIN escape code and contains a MIN in its 10 least significant digits a True IMSI does not contain a MIN escape code or MIN Service Providers control the impact of the feature on their networks can be limited to the air and internal system interfaces February 2004 Slide 3

4 Enables Enhanced PRL Enhanced PRL Takes Advantage of Network ID Currently Broadcast Over the CDMA Air Interface MCC and IMSI_11_12 broadcast in the Extended System Parameters Message (ESPM) IMSI_11_12 = MNC if IMSI is 15 digits and MNC is 2 digits AUTOPLEX System 1000/FLEXENT System Can Be Configured to Broadcast MCC and IMSI_11_12 With off, mobiles programmed with MCCs and IMSI _11_12s Network s MCC and IMSI_11_12 are not served With off, many networks are configured to broadcast a network escape code of all 1s for MCC and IMSI_11_12 (this allows them to operate as MIN networks and serve any mobile programmed with a MIN-Based IMSI) With on, mobiles programmed with MCCs and IMSI _11_12s Network s MCC and IMSI_11_12 are served February 2004 Slide 4

5 MDN Vs. MIN Vs. IMSI Mobile Directory Number (MDN) NPA NXX-XXXX (for North America) address used by the PSTN for call delivery Mobile Identification Number (MIN) fixed 10-digit number pre-min/dn separation: NPA NXX-XXXX (=MDN) post-min/dn separation: may not equal MDN identifier used by AMPS/TDMA, e.g., for paging International Mobile Station Identity (IMSI) variable length number up to 15 digits identifier used by CDMA/TDMA, e.g., for paging no relationship to MDN February 2004 Slide 5

6 International Mobile Station Identity (IMSI) IMSI format specified by ITU-T E.212 consists of: Mobile Country Code (MCC) Mobile Network Code (MNC) Mobile Station Identification Number (MSIN) National Mobile Station Identity (NMSI) = MNC+MSIN MCC MNC MSIN 3 digits NMSI <=12 digits IMSI <= 15 digits February 2004 Slide 6

7 Interfaces Affected by IMSI Other Network Elements, e.g., Standalone HLR Before CDMA Full IMSI, MIN used as MSID on network and OA&M interfaces After CDMA Full IMSI, IMSI or MIN (if mobile has both) used as MSID on network and OA&M interfaces MIN-based IMSIs continue to be treated as MINs February 2004 Slide 7 ANSI-41 and Proprietary MSC DB Proprietary OA&M Systems, e.g., Configuration Management MSC Proprietary/IOS IS-95 Cell Mobile sends MCC, IMSI_11_12 and/or IMSI_S to cell IMSI_11_12: the 11th and 12th IMSI digits IMSI_S: the 10 least significant IMSI digits

8 Network Transition to IMSI Deploying Lucent s Feature February 2004 Slide 8

9 Evolution to IMSI is designed for the transition of the network from MIN to IMSI as an MSID the rate of the transition is controlled by service providers For Enhanced PRL, only air and internal system interface capabilities need to be activated for mobiles programmed with MIN-based IMSIs, feature can be configured to continue to use MIN for network (e.g., ANSI-41) and OA&M interfaces IMSI systems will coexist with MIN systems mobile s MIN continues to be communicated between IMSI and MIN systems Mobiles do not need to be reprogrammed when CDMA Full IMSI is activated IS-95A mobiles can continue to be programmed with MIN-Based IMSIs so that they can receive service from IMSI or MIN systems IS-95B mobiles can be programmed with both True IMSI and MIN- Based IMSI and will monitor the True IMSI Supported bit in the ESPM to determine which to use for CDMA system access February 2004 Slide 9

10 MSC Configuration Management is an optional feature when the feature is turned on, service providers can begin populating/changing IMSI-related data Active parameter controls feature activation when this field is set to yes, the MSC expects IMSI rather than MIN in cell messages, e.g., origination requests, page responses True IMSI Supported parameter tells IS-95B mobiles having both MIN-Based and True IMSIs which to use when this field is set to yes, mobiles are to use their true IMSI for system access MIN escape codes parameter contains the values used by this system to identify MIN-Based IMSIs February 2004 Slide 10

11 Cell Service Area Configuration Management Specifies values of MCC and IMSI_11_12 that cell broadcasts in the ESPM air interface is optimized by specifying the values programmed into most mobiles served in this area if mobile s MCC is the same as that broadcast by the cell, then mobile sends IMSI_11_12 and IMSI_S (but not its MCC) If mobile s MCC and IMSI_11_12 match those broadcast by the cell, then mobile only sends IMSI_S February 2004 Slide 11

12 MIN to IMSI Network Migration Four stage network deployment plan 1) turn on - allows System Operators to populate HLR/VLR DBs, but not use IMSI on the system interfaces 2) if True IMSIs supported, update other systems, e.g., IWFs, SCPs, SHLRs, message centers, OTAFs, that use ANSI-41 to communicate with the MSC 3) simultaneously turn on Feature Active indicator for all MSCs in the same soft/semisoft handoff universe- call processing starts using IMSIs on system interfaces 4) turn on True IMSI Supported flag - mobiles programmed with both a MIN-Based IMSI and True IMSI are instructed to access the system using their True IMSI February 2004 Slide 12

13 IMSI Standards Number Description E.212 ITU-T recommendation for the IMSI format TIA/EIA-95-A ANSI specification of the procedures for use of IMSI on the air interface for IS-95-A and later CDMA MSs IS-751 ANSI specification of the procedures for use of IMSI on the ANSI-41 network February 2004 Slide 13

14 Summary Provides the ability for the system to use all of the digits in a mobile s IMSI, not just the IMSI_S IMSI is a globally unique mobile station identifier Supports IMSI on system interfaces, e.g., OA&M and ANSI-41 IMSI and/or MIN used if mobile is programmed with both Enables Operation of Enhanced PRL network s MCC and IMSI_11_12 values can be broadcast while still serving mobiles with non-matching MCC and IMSI_11_12 values MSC can be configured to serve mobiles with MIN-based IMSIs without modifying other network elements, e.g., SHLRs, SMSCs Service Providers are encouraged to contact their Lucent Customer Team for more information February 2004 Slide 14