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Handoff-measurement Processes
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ANSI-41 handoff-measurement processes include the serving MSC handoff-measurement process and the candidate MSC handoff-measurement process, which executes in each candidate MSC The serving MSC handoff-measurement process may be used to evaluate a candidate MSC s suitability for the role of serving MSC, that is, to accept a call handoff Since multiple candidates may be involved, the serving MSC is capable of requesting and collecting measurement data from one or several candidate MSCs (see Figure 95)
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Figure 95 An example of the handoff measurement processes: (1) The
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Serving MSC
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Candidate MSC #1
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Candidate MSC #2
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information (3) Candidate MSC #2 measures an unacceptable signal quality level, so does not respond
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= call path 1
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HANDMREQ HANDMREQ handmreq 2 3 no response from MSC #2
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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
Basic Intersystem Handoff Functions
Part 2:
ANSI-41 Explained
As shown in Figure 95, the serving MSC uses the HandoffMeasurementRequest Invoke (HANDMREQ) message4 to request the measurement data from the candidate MSC The candidate MSC handoff-measurement process provides handoff suitability information to the serving MSC This information may be either explicit or implicit Explicit information includes measures of signal quality that the candidate MSC provides to the serving MSC Implicit information is provided to the serving MSC simply by the candidate MSC s failure to respond to the serving MSC s request for measurement information (eg, as candidate MSC 2 does in Figure 95) In the latter case, the candidate MSC may not respond because: 1 The candidate MSC cannot support the requested radio channel characteristics; for example, a TDMA digital channel may be required but is not available 2 The signal quality that the candidate MSC measures does not meet its internal criteria for acceptability 3 The current traffic conditions 5 on the candidate MSC render it unavailable for handoff purposes at the given time; therefore, it chooses to disregard the serving MSC s request (although this information could be explicitly provided to the serving MSC via an error response) While not sending a handoff-measurement response to the serving MSC may be more efficient for the candidate MSC, it requires the serving MSC to wait the maximum time by default, seven seconds in ANSI-41 Revision D before it can be sure that all candidate responses have been received
Unless otherwise indicated, the HandoffMeasurementRequest2 operation may be substituted for references to the HandoffMeasurementRequest operation; eg, either HandoffMeasurementRequest Invoke or HandoffMeasurementRequest2 Invoke messages may be used by the serving MSC The HandoffMeasurementRequest2 operation was added to IS-41 in Revision C to support all air-interface standards, including CDMA and narrowband AMPS (NAMPS) MSs; the HandoffMeasurementRequest operation supports TDMA and AMPS MSs, but not CDMA or NAMPS For example, radio channel resource availability influences the candidate MSC s ability to support handoff There are many implementation-dependent strategies for allocating radio channels for handoff For instance, some systems reserve a number of channels to support handoff from other systems, regardless of whether channels are available to new calls within that system Other systems allocate channels for handoff only if they are available; if they are not, the call is dropped
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Basic Intersystem Handoff Functions
9:
Basic Intersystem Handoff Functions
As shown in Figure 95, the candidate MSC s measurement information is conveyed to the serving MSC in the HandoffMeasurementRequest Return Result (handmreq) message Once the serving MSC has selected the target MSC for the call handoff, it must decide on the form of handoff that is appropriate:
If the target MSC is already involved in the call and connected to the serving MSC via an inter-MSC circuit, a handoff back is required Otherwise, the serving MSC may attempt path minimization or choose simply to perform a handoff forward
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