Browse Prior Art Database

REUSING IMSI IN THE DAP IN iDEN

IP.com Disclosure Number: IPCOM000007761D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-19
Document File: 2 page(s) / 64K

Publishing Venue

Motorola

Related People

Ziva Averbuch: AUTHOR [+2]

Abstract

A subscriber tuple in the DAP contains differ- ent elements and most of them can be changed by the DAP operator using a Change command. The IMEI element can not be changed using the Change command. The only way to do so is by deleting the entire tuple in the DAP and re-entering the same elements associated with this IMEI only with a new IMEI. When doing so, the operator can reuse the IMSI associated with the deleted IMEI tuple. Ifthe IMSI is reused, it is possible that two radios will contain the same IMSI.

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0 M M-LA

Technical Developments

REUSING IMSI IN THE DAP IN iDEN

by Ziva Averbuch and Ralph Riley

BACKGROUND SOLUTION

  A subscriber tuple in the DAP contains differ- ent elements and most of them can be changed by the DAP operator using a Change command. The IMEI element can not be changed using the Change command. The only way to do so is by deleting the entire tuple in the DAP and re-entering the same elements associated with this IMEI only with a new IMEI. When doing so, the operator can reuse the IMSI associated with the deleted IMEI tuple. Ifthe IMSI is reused, it is possible that two radios will contain the same IMSI.

  The proposed idea performs an automatic IMEI and IMSI match only for radios with flag on (see Figure 2). A flag will be set for each changed/inserted tuple for a random time period, invisible to user and operator. When this period of time expires or a radio has been deleted, the flag will reset (see Fig- ure 1).

  This procedure maintains low processing load on the DAP yet it eliminates radios with the same IMSIs. It forces the radio's (whose IMEI was deleted from the DAP) IMSI to be erased from its code plug. Therefore, this radio can not get service from the system.

Delete - Reinsert IMEI

Set Initial Random Timer I

Fig. 1 IMSI flag mechanism

a Mo,orola. Inc. 1996

34 August 1996

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MOTOROLA Technical Developments

IMEI request

from radio

I

Crosss Check IMSI &

Check IMSI

only

Erase...