Importance

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Abstract

A method which supports Mobile Station (MS) handoff back operations across tandem switches makes use of a modification to the ANSI-41 Standard. The method includes the steps of determining that a handoff back call connection operation to a Target Mobile Switching Center (involved in the call path and not directly connected to the Serving Mobile Switching Center) should occur, verifying that the Target Mobile Switching Center (Target MSC) is also the Anchor MSC, verifying that a designated channel of the Target MSC is available to support the MS, and moving the MS directly to the designated channel. The address of the Anchor MSC is obtained using the MSCID contained within the BillingID parameter of a FacilitiesDirective message received by the tandem MSC directly connected to the serving MSC prior to initiating the handoff back operation. The method operates within a telecommunications network, including an MS served by a Serving MSC connected along a call path to one or more Tandem MSCs and the AMSC, and which is connected in series with the Tandem MSCs by one or more inter-MSC trunks. The handoff back call connection operation occurs directly from the SMSC to the AMSC and may even be used within networks which do not support path minimization operations.

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First Claim