Browse Prior Art Database

ALERTING OF A TARGET USER DURING CALL SET-UP

IP.com Disclosure Number: IPCOM000008631D
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jun-28
Document File: 2 page(s) / 106K

Publishing Venue

Motorola

Related People

Naum Spektor: AUTHOR [+3]

Abstract

In existing IDEN (and GSM) systems, when the originating mobile (OM) or Land unit places an interconnect call to a target mobile (TM), the infra- structure (ACG) allocates to a TM radio traffic channel (TCH) first and then attempts to allocate terrestrial resources such as voice processors, full- rate and subrate terrestrial voice channels and other BSC and XCDR resources. Upon receiving a TCH, the target mobile, according to current algorithm, sends Alerting message to infrastructure and begins to alert the target's user (usually by a ringing sound) regardless whether or not the further resources allo- cation is successful.

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MOTOROLA Technical Developments

ALERTING OF A TARGET USER DURING CALL SET-UP

by Naum Spektor, Kamala D.Urs and Anatoly Belkin

  In existing IDEN (and GSM) systems, when the originating mobile (OM) or Land unit places an interconnect call to a target mobile (TM), the infra- structure (ACG) allocates to a TM radio traffic channel (TCH) first and then attempts to allocate terrestrial resources such as voice processors, full- rate and subrate terrestrial voice channels and other BSC and XCDR resources. Upon receiving a TCH, the target mobile, according to current algorithm, sends Alerting message to infrastructure and begins to alert the target's user (usually by a ringing sound) regardless whether or not the further resources allo- cation is successful.

   In case if one or more of the necessary infra- structure-to-target or infrastructure-to-originator resources are not available to support communication, the infrastructure transmits a Disconnect message to the target and reclaims the previously allocated traffic channel. Therefore, when the interconnect call cannot be successfully completed due io the lack of necessary resources, the target user has already been disturbed unnecessarily by the ringing.

To illustrate said above two following scenarios can be considered.

1. Mobile-to-Mobile call cannot be successfully completed due to the lack of target XCDR resources (See Figure 1). Generally these resources cannot be allocated before the TCH allocation due to channel negotiation, which allows the type of allocated TCH to be changed. Therefore the XCDR resources have to be changed. In this case, the target user will be alerted until infrastructure disconnects TCH.

2. Mobile-to-Mobile call within the same base radio (BR) cannot be successfully completed due to the lack of one of two needed TCHs. In this case OM equipped this TCH and TM is queued for, usually, 10 sec. If OM releases TCH while TM is still queued TM gets this channel and begins ringing until infrastructure disconnects TCH.

Targ.TM Orig.OM BSC MSC

Assignment Request <-----------------------------------------------------------------

Assignment Response Assignment Failure -----------------------------------------> ---------------------->

Term.TM normally Assignment of BSC/XCDR begins alerting resources can fail here at this point

ALERTING

>

ALERTING <--------------------------------------------------------

Fig. 1 Current Algorithm

166 March 1998

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MOTOROLA Techrlic...