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Basic Intersystem Handoff Functions
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Before path minimization
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BS 6 7 10 Serving MSC 4 inter-MSC circuit HANDTHIRD FACDIR facdir handthird MSONCH FACREL
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Anchor MSC
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Target MSC
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= call path 2
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facrel
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After path minimization
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Old serving MSC Anchor MSC
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inter-MSC circuit
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Figure 910 An example of the path minimization processes: (1) The serving MSC sends a path minimization request to the anchor MSC (2) The anchor MSC attempts to determine if path minimization is possible; it sends a handoff request to the target MSC (3) The target MSC accepts the handoff request (4) The selected inter-MSC circuit between the anchor MSC and the target MSC is now ready for the handoff (5) The anchor MSC accepts the path minimization request (6) The serving MSC issues a handoff order to the MS (7) The MS tunes to the new channel and is detected by the target MSC (8) The target MSC notifies the anchor MSC that the MS has been detected (9) The anchor MSC connects the call path to the inter-MSC circuit, completing the handoff It then releases the unnecessary inter-MSC circuit to the serving MSC (10) The inter-MSC circuit is released and is now ready for other handoff purposes
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Basic Intersystem Handoff Functions
Part 2:
ANSI-41 Explained
Serving MSC Path-minimization Process
The serving MSC path-minimization process manages path-minimization call control in the serving MSC The key tasks for the serving MSC, when there are no tandem MSCs in the handoff chain (as is the case in Figure 910) are as follows:
Identify the inter-MSC circuit that already provides a land-line connection between the serving MSC and the anchor MSC; this circuit must be released once path minimization is completed Request that the anchor MSC perform path minimization; the serving MSC uses the HandoffToThird Invoke (HANDTHIRD) message10 for this purpose When notified that the anchor MSC accepts the path minimization request via the HandoffToThird Return Result (handthird) message, direct the MS to move from the current serving radio channel to the desired target radio channel When notified by the anchor MSC that the MS has moved to the target channel via the FACREL message, acknowledge the message by sending a facrel message to the anchor MSC and release the interMSC circuit along with any other resources used for the call
If there are one or more tandem MSCs in the handoff chain, the only change in the process is that the serving MSC must send the path minimization request toward the anchor MSC by way of the tandem MSC(s) Either the anchor MSC or possibly a tandem MSC may then provide the path minimization acceptance notification (ie, the handthird message) to the serving MSC the serving MSC is not explicitly informed of the source of the acceptance
Anchor MSC Path-minimization Process
The anchor MSC path-minimization process manages path-minimization call control in the anchor MSC This process is initiated by the
Unless otherwise indicated, the HandoffToThird2 operation may be substituted for references to the HandoffToThird operation; eg, either HandoffToThird2 Invoke or HandoffToThird2 Invoke messages may be used by the serving MSC The HandoffToThird2 operation was added to IS-41 in Revision C to support all air-interface standards, including CDMA and narrowband AMPS (NAMPS) MSs; the HandoffToThird operation supports TDMA and AMPS MSs, but not CDMA or NAMPS
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Basic Intersystem Handoff Functions
9:
Basic Intersystem Handoff Functions
receipt of the HANDTHIRD message from the serving MSC (possibly via a tandem MSC) The key tasks of the process are, first, to determine if the anchor MSC is the target MSC for the handoff If the anchor MSC is not the target (as in Figure 910), then the following steps are performed:
Select and reserve the inter-MSC circuit that will provide the landline connection between the anchor MSC and the target MSC Request a call handoff to the target MSC using information (eg, target cell identification) provided to the anchor MSC by the serving MSC in the HANDTHIRD message The anchor MSC uses the FACDIR message to request the call handoff to the target MSC When notified that the target MSC accepts the call handoff request via the facdir message, notify the serving MSC that its path minimization request is accepted; the anchor MSC uses the handthird message for this purpose When notified that the MS has moved to the target channel via the MSONCH message, connect the other party to the MS, using the inter-MSC circuit established between the anchor and target MSCs Initiate release of the inter-MSC circuit (or circuits, if there are one or more tandem MSCs) between the anchor MSC and the old serving MSC, using the FACREL message
On the other hand, if the anchor MSC is the target MSC for the handoff, then it executes the following steps (see Figure 911):
Determine whether resources, like a radio channel, are available for the call handoff; if not, reject the serving MSC s path minimization request by sending a HandoffToThird Return Error message to the serving MSC and end the process Otherwise, notify the serving MSC that its path minimization request is accepted, using the handthird message Wait until the MS is detected on the target radio channel; then complete the path between the radio channel and the other party to the call Notify the old serving MSC that the MS has successfully moved to the new radio channel, and initiate release of the inter-MSC circuit between the anchor and the old serving MSC; the anchor MSC uses the FACREL message for this purpose
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