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Handoff Forward
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The ANSI-41 handoff-forward functions provide the specialized form of call control signaling needed to (1) move the MS from a radio channel on the serving MSC to a compatible radio channel on the target MSC while (2) maintaining a call path between the MS and the other party to the active call by establishing a land-line circuit between the serving MSC and the target MSC Compatibility of serving and target radio channels has a number of aspects including:
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The ability of the target to support the desired call mode (eg, AMPS, CDMA, TDMA, or NAMPS) The ability of the target to support the characteristics of the MS (eg, power class, use of discontinuous transmission) The ability of the target to support the confidentiality modes desired by the service subscriber (eg, encryption of the radio channel)
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Handoff forward also has a uniquely identifiable characteristic: When successfully executed, handoff forward results in an increase in the length of the handoff chain within the limit set by the MAXHANDOFF system parameter6 Finally, new provisions for call handoff prior to the call s being answered were added to IS-41 in Revision C Two cases are covered:
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Note that the MAXHANDOFF parameter is not an ANSI-41 parameter, but rather a system parameter programmed in each MSC by the mobile telecommunications service provider
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Downloaded from Digital Engineering Library @ McGraw-Hill (wwwdigitalengineeringlibrarycom) Copyright 2004 The McGraw-Hill Companies All rights reserved Any use is subject to the Terms of Use as given at the website
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Basic Intersystem Handoff Functions
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ANSI-41 Explained
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In the MS-originated call case, the MS is awaiting answer by the called party when handoff forward occurs In this situation, special procedures are useful to inform the target MSC when the called party answers; for example, for call timing purposes In the MS-terminated call case, the MS is being alerted when handoff forward occurs In this situation, special procedures are useful to ensure that the MS is placed on the new target channel in the alerting state and to inform the anchor MSC when the MS answers
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ANSI-41 handoff-forward processes include the serving MSC handoffforward process and the target MSC handoff-forward process, illustrated in Figure 96
Serving MSC Handoff-forward Process
The serving MSC handoff-forward process manages handoff-forward call control in the serving MSC The key tasks for the serving MSC are as follows:
Select and reserve the inter-MSC circuit that will provide the landline connection between the serving MSC and the target MSC Request a call handoff to the target MSC The serving MSC uses the FacilitiesDirective Invoke (FACDIR) message7 for this purpose When notified that the target MSC accepts the call handoff request via the FacilitiesDirective Return Result (facdir) message, direct the MS to move from the current serving radio channel to the desired target radio channel When notified that the MS has moved to the target channel via the MobileOnChannel Invoke (MSONCH) message, connect the other party to the MS by using the inter-MSC circuit If the handoff occurs while the MS is awaiting answer (ie, in the case of an MS-originated call), wait until the called party answers and then inform the target MSC, using the InterSystemAnswer Invoke (ISANSWER) message (see Figure 97)
Unless otherwise indicated, the FacilitiesDirective2 operation may be substituted for references to the FacilitiesDirective operation; eg, either FacilitiesDirective Invoke or FacilitiesDirective2 Invoke messages may be used by the serving MSC The FacilitiesDirective2 operation was added to IS-41 in Revision C to support all air-interface standards, including CDMA and narrowband AMPS (NAMPS) MSs; the FacilitiesDirective operation supports TDMA and AMPS MSs, but not CDMA or NAMPS
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