1、 TIA-41.290-E (Revision of TIA-41.290-D) February 2007Mobile Application Part (MAP) - Intersystem Handoff Annex A ANSI/TIA-41.290-E-2007 APPROVED: FEBRUARY 2, 2007 REAFFIRMED: JANUARY 10, 2013 NOTICE TIA Engineering Standards and Publications are designed to serve the public interest through elimina
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19、nications Industry Association 2006. All rights reserved.This document is subject to change.Revision Date RemarksTIA-41.290-E May 2006 Initial publication.TIA-41.290-E123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960290-1PART 290Annex A:
20、Additional DMH Support for Intersystem Handoff in MAP (normative)This Annex is normative and is considered part of this Specification.The Data Message Handler standard has some impact upon MAP. The changes which impact MAPIntersystem Operations are:1. Change segment numbering to include the tandem s
21、egments as well as the air timesegments.2. DMH requires the number of segments in a call be saved in the audit record. This infor-mation must be passed from the serving system to the anchor system upon call disconnect.These changes are detailed in the following stage 2 diagrams. Only the scenario st
22、eps which involveDMH related changes are described.d. If the Serving MSC (Anchor) opens a tandem segment, it increments the current segmentcounter and then passes that value in the FACDIR.Figure 1 Handoff-Forward (A to B)abcdefgMSC MSCConversationMSONCHHANDMREQhandmreqFACDIR (Seg=n+1)Open Tandem Seg
23、ment n+1Open Air Segment n+2facdirConversationClose Air Segment nA Anchor Serving BTarget TIA-41.290-E123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960290-2g. If the Anchor MSC had a tandem segment open, it should now close that segment.F
24、igure 2 Handoff-Back (B to A)abcdeghfAAnchor TargetBServingMSC MSCHANDMREQ handmreq handbackFACRELfacrel ConversationHANDBACK (Seg=n) Open Tandem Segment A-BClose Air Segment nClose Air Segment n+1ConversationTIA-41.290-E1234567891011121314151617181920212223242526272829303132333435363738394041424344
25、45464748495051525354555657585960290-3d. If the Serving MSC opens a tandem segment, it increments the current segment counter andthen passes that value in the FACDIR.Figure 3 Handoff-Forward (B to C)abcdegfAAnchor BServing CTarget Conversation HANDMREQ handmreq FACDIR (Seg=n+1) facdir MSONCH Conversa
26、tion MSC MSC MSC Open Tandem Segment n+1Open Air Segment n+2Close Air Segment nTIA-41.290-E123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960290-4g. If the Serving MSC opened a tandem segment, it should close it now. Figure 4 Handoff-Back
27、(C to B)abcdeghfAAnchor BTarget and Tandem CServing MSC MSC MSC ConversationHANDMREQ handmreq HANDBACK (Seg=n) handbackFACREL facrel Conversation Close Tandem Segment B-COpen Air Segment n+1Open Air Segment nTIA-41.290-E12345678910111213141516171819202122232425262728293031323334353637383940414243444
28、5464748495051525354555657585960290-5d. If the Anchor MSC opens a tandem segment, it increments the current segment counter andthen passes that value in the FACDIR.j. If the Serving MSC opened a tandem segment, it should close it now.Figure 5 Path Minimization (A-B to A-C)abcdegkfhijAAnchor CTarget B
29、Serving MSCMSCMSCConversation HANDMREQ handmreq HANDTHIRD (Seg=n)FACDIR (Seg=n+1) facdir handthird MSONCH FACREL facrel Conversation Open Tandem Segment n+1Open Air Segment n+2Close Air Segment n Close Tandem Segment A-B TIA-41.290-E1234567891011121314151617181920212223242526272829303132333435363738
30、39404142434445464748495051525354555657585960290-6b. When the Serving MSC detects that the MS has disconnected or has lost radio contact, itsignals the release of the facilities with a FACREL including the number of segmentscurrently allocated.d. When a Tandem MSC processes a FACREL containing the nu
31、mber of segments in aBillingID, it should relay that parameter toward the Anchor MSC.Figure 6 Release by the MS (C-B-A)abcdeMSCAAnchor BTarget CServing MSC MSC Conversation FACREL (Seg=n) facrel FACREL (Seg=n) facrel Open Tandem Segment A-B Close Tandem Segment B-C Close Audit Record (Seg=n+1) TIA-4
32、1.290-E123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960290-7b. When the Anchor MSC receives a disconnect request from the other party for a handed offMS, it should launch a FACREL and start a timer to wait for the response. If the timere
33、xpires, an indicator for an unknown number of segments can be used.c. When a Tandem MSC receives a FACREL from the Anchor MSC for a handed off MS, itshould launch a FACREL toward the Serving MSC and start a timer to wait for the response.If the timer expires, an indicator for an unknown number of se
34、gments can be used.Upon receipt of the FACREL the Serving MSC can release any facilities that it is using andclose out the current air segment DMH record. It confirms the release by sending a facrelto the Tandem MSC including the BillingID to convey the number of segments.d. When a Tandem MSC receiv
35、es a facrel from the Serving MSC for a handed off MS, itcan release any facilities that it is using and close out the current tandem segment DMHrecord. It confirms the release by sending a facrel to the Tandem MSC including theBillingID to convey the number of segments.e. When the Anchor MSC receive
36、s a facrel from the Tandem or Serving MSC for a handedoff MS, it can release any facilities that it is using and close out the current tandem segmentDMH record and the audit record for the call with the number of segments.Figure 7 Release by the other party (A-B-C)abcdeMSCAAnchor BTandem CServing MS
37、C MSC Conversation FACREL facrel (Seg=n) Close Tandem Segment A-B Close Audit Record (Seg=n+1) facrel (Seg=n) FACREL Close Tandem Segment B-C Close Air Segment C TIA-41.290-E123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960290-8a. This sc
38、enario occurs when an active call is disconnected by both the originating party andterminating party at about the same time.b. When the Anchor MSC receives a disconnect request from the other party for a handed offMS, it should launch a FACREL and start a timer to wait for the response. If the timer
39、expires, an indicator for an unknown number of segments can be used.When a Tandem MSC receives a FACREL from the Anchor MSC for a handed off MS, it should launch a FACREL toward the Serving MSC and start a timer to wait for the response.Upon receipt of the FACREL the Serving MSC can release any faci
40、lities that it is using andclose out the current air segment DMH record.The Serving MSC detects a disconnect request from the MS at about the same time andsends a FACREL toward the Anchor MSC with the number of segments. The Serving MSCis unaware that the other end is releasing simultaneously.c. Bot
41、h the Tandem and Serving MSCs will receive the FACREL before they receive afacrel.d. The Tandem MSC will send a facrel to the Serving MSC.Figure 8 Release GlareabcdgefAAnchor BTandem CServing MSC MSC MSCPSTN Conversation FACREL (Seg=n) facrel facrel (Seg=n)FACREL facrel (Seg=n) Close Tandem Segment
42、A-B Close Audit Record (Seg=n+1) FACRELClose Air Segment CClose Tandem Segment B-CTIA-41.290-E123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960290-9e. The Serving MSC will send a facrel to the Tandem MSC including the number ofsegments.f. The Tandem MSC sends the facrel to the Anchor MSC including the number ofsegments.TIA-41.290-E123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960290-10
