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AN EFFICIENT METHOD TO KEEP TRACK OF SERVICE CANCELLATIONS DURING ZONE ROAMING

IP.com Disclosure Number: IPCOM000008405D
Original Publication Date: 1997-Dec-01
Included in the Prior Art Database: 2002-Jun-12
Document File: 2 page(s) / 76K

Publishing Venue

Motorola

Related People

Mark Zollner: AUTHOR

Abstract

The problem occurs in wide area distributed tnmked communication systems, such as OmniLink or APCO, when a radio roams to a new zone and cancels a request before the controlling zone can add the new zone into the call. Since the new zone does not know that the radio is involved in a call, it ling Zone) will dump the request. When the new zone actually receives the message to add the radio into the call, it will not remember/know that the radio has can- celled the request. As a result, the call might poten- tially be stuck where the controlling zone thinks that call has been added since resources have been acquired, but the radio is not involved in the call. See Figure 1 for an example.

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MOTOROLA Technical Developments

AN EFFICIENT METHOd TO KEEP TRACK OF SERVICE CANCELLATIONS DURING ZONE ROAMING

by Mark Zollner

SERVICE CANCELLATIONS DURING ROAMING

  The problem occurs in wide area distributed tnmked communication systems, such as OmniLink or APCO, when a radio roams to a new zone and cancels a request before the controlling zone can add the new zone into the call. Since the new zone does not know that the radio is involved in a call, it

ling Zone)

will dump the request. When the new zone actually receives the message to add the radio into the call, it will not remember/know that the radio has can- celled the request. As a result, the call might poten- tially be stuck where the controlling zone thinks that call has been added since resources have been acquired, but the radio is not involved in the call. See Figure 1 for an example.

N4

Y zone

At this point. theCZis in theprocess (
.&ding the new zone into the call.

Before thenew zonereceives the message that will infomt it of the navcall, the radio en& the&sting call. Sinceno call sists, the ISW is discarded

when themessageanives, thenew zone will not remember that the radio has aIre& en&d the call. and as aresult, resomces will be acquired It is at this paint that the call can get stuck.

IAdd New Call

l

Fig. 1

'0 M"torola. Inc. 19v1

46 December 1997

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MOTOROLA Technical Developments

SOLUTION

  One way that can be used to sol...