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Authentication Functions
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ANSI-41 Explained
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ANSI-41 also does not explicitly define the procedures to follow if the serving system s ability to handle shared authentication responsibilities changes during the period when an MS is visiting in the serving system s area, such as, due to a failure in the subsystem that performs the authentication calculations We can speculate on at least two approaches to this scenario:
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If the serving system is still able to support AC-controlled authentication procedures, then the serving system can notify the AC of its modified SSD sharing capabilities at the next authentication event (eg, call origination) Alternatively, the serving system can initiate the location-cancellation process for one or more visiting MSs in the system, as described in 10; that is, using the ANSI-41 MSInactive Invoke message including the DeregistrationType parameter, or using the ANSI-41 BulkDeregistration Invoke message Use of MSInactive is the preferred approach since (a) it allows the serving system to convey the current value of COUNT to the AC (see Call History Count Update ), and (b) it allows selective location cancellation of only those MSs for which the serving system is sharing authentication responsibilities, rather than all visiting MSs
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Turning SSD Sharing On and Off
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Given that the serving system is capable of sharing authentication responsibilities, the AC initiates SSD sharing by sending the ANSI-41 SSD and COUNT parameters to the serving system The AC may use one of four ANSI-41 messages for this purpose (see Figure 113):
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AuthenticationDirective Invoke (AUTHDIR) AuthenticationRequest Return Result (authreq)4 AuthenticationStatusReport Return Result (asreport)4 AuthenticationFailureReport Return Result (afreport)4
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Of course, the information may be conveyed in the specified Return Result message only as part of the AC s response to the corresponding Invoke message (eg, the authreq message is in response to the AUTHREQ message)
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Authentication Functions
11: Authentication Functions
(a) (b)
Serving system
Serving system
AUTHDIR [commands] AUTHDIR [commands] authdir authdir
AUTHREQ AUTHREQ authreq [commands] authreq [commands]
Serving system
Serving system
ASREPORT ASREPORT asreport [commands] asreport [commands]
AFREPORT AFREPORT afreport [commands] afreport [commands]
The AC may send authentication-related commands to the serving system, including the
Once SSD sharing is turned on, the AC may turn it off by sending the SSDNotShared (NOSSD) parameter to the serving system Although ANSI-41 specifies that the AC may use any of the four ANSI-41 messages listed above to turn off SSD sharing, the AUTHDIR message appears to be the most practical for the following reason: When turning off SSD sharing, the AC must retrieve the current COUNT from the serving system The response to the AUTHDIR the AuthenticationDirective Return Result (authdir) message includes the COUNT parameter;
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Authentication Functions
Part 2:
ANSI-41 Explained
therefore, it provides a convenient method of COUNT retrieval under these conditions (see Figure 114) AC retrieval of COUNT when using the other messages to turn off sharing (ie, authreq, asreport, or afreport) is more problematic
Figure 114 To turn off SSD sharing, the AUTHDIR message should be used since it allows the COUNT to be retrieved from the serving system
Serving system
AUTHDIR [NOSSD] AUTHDIR [NOSSD] authdir [COUNT] authdir [COUNT]
AC Retrieval of Shared COUNT Information
When SSD is shared, the AC gives the serving system the current SSD and COUNT values for the MS in question The serving system is not autonomously able to initiate a change in the MS s SSD this is strictly an AC-controlled function (see SSD Update ) However, the serving system may based on its internal authentication algorithms order the MS to increment its COUNT value without informing the AC (see Call History Count Update ) Therefore, the final aspect of SSD sharing that has to be managed between the AC and serving system is COUNT retrieval how the AC gets the (potentially revised) COUNT information (1) from the serving system when the AC turns off SSD sharing and (2) from the previous serving system when the MS moves to a new serving system Four general scenarios are handled: 1 COUNT retrieval when the AC turns off SSD sharing was described in the previous section 2 The MS moves from one authentication-capable system to another authentication-capable system (see Figure 115) In this case, the initial ANSI-41 message sent from the new serving system to the home system is normally an AUTHREQ message5 When the AC receives this message, it sends a CountRequest Invoke (COUNTREQ) message to the previous serving system The previous serving system
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