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1. WO1997050266 - METHOD AND APPARATUS FOR MONITORING LINK ACTIVITY TO PREVENT SYSTEM DEADLOCK IN A DISPATCH SYSTEM

Publication Number WO/1997/050266
Publication Date 31.12.1997
International Application No. PCT/US1997/010831
International Filing Date 23.06.1997
Chapter 2 Demand Filed 24.12.1997
IPC
H04B 7/26 2006.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
7Radio transmission systems, i.e. using radiation field
24for communication between two or more posts
26at least one of which is mobile
H04W 4/10 2009.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
4Services specially adapted for wireless communication networks; Facilities therefor
06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service ; Services to user groups; One-way selective calling services
10Push-to-talk or push-on-call services
H04W 84/08 2009.01
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
84Network topologies
02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN  or WLL
04Large scale networks; Deep hierarchical networks
08Trunked mobile radio systems
CPC
H04W 4/10
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
4Services specially adapted for wireless communication networks; Facilities therefor
06Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
10Push-to-Talk [PTT] or Push-On-Call services
H04W 76/45
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
WWIRELESS COMMUNICATION NETWORKS
76Connection management
40for selective distribution or broadcast
45for Push-to-Talk [PTT] or Push-to-Talk over cellular [PoC] services
Applicants
  • QUALCOMM INCORPORATED [US]/[US]
Inventors
  • YAO, Yu-Dong
  • GROB, Matthew, S.
Agents
  • OGROD, Gregory, D.
Priority Data
669,77826.06.1996US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR MONITORING LINK ACTIVITY TO PREVENT SYSTEM DEADLOCK IN A DISPATCH SYSTEM
(FR) PROCEDE ET APPAREIL PERMETTANT DE SURVEILLER L'ACTIVITE DE LIAISON AFIN DE PREVENIR L'INTERBLOCAGE DU SYSTEME DANS UN SYSTEME DE GESTION D'UNE FLOTTE DE MOBILES
Abstract
(EN)
A method and apparatus to prevent system deadlock in a dispatch system by monitoring link activity is described. The dispatch system is comprised of a set of remote units (10, 20, 22) which communicate with each other by broadcasting one at a time to the group. A remote unit (10) communicates with the other remote units through at least one base station (44). A communications manager (40) grants a remote unit (10) to be the exclusive system talker upon request through the base station servicing the requesting remote unit (44). The base station (44) monitors a series of data from the remote unit designated as the system talker (10) to detect voice activity. The base station (44) sends a surrogate request to the communications manager (40) to relinquish the system talker privilege if the voice activity falls below a predetermined threshold.
(FR)
La présente invention concerne un procédé et un appareil permettant de prévenir, par la surveillance de l'activité de liaison, l'interblocage du système dans un système de gestion d'une flotte de mobiles. Ledit système de gestion d'une flotte de mobiles comprend un ensemble d'unités distantes (10, 20, 22) qui communiquent entre elles en émettant chacune à leur tour vers le groupe. Une unité distante (10) communique avec les autres unités distantes via au moins une station fixe (44). Un gestionnaire des communications (40) octroie à une unité distante (10) le statut d'émetteur exclusif du système en réponse à la demande transmise via la station fixe qui dessert l'unité distante demandeuse (44). La station fixe (44) surveille une série de données provenant de l'unité distante désignée comme émetteur du système (10) afin de détecter une activité vocale. La station fixe (44) envoie au gestionnaire des communications (40) une demande de substitution qui requiert l'annulation du statut d'émetteur du système lorsque l'activité vocale descend en-dessous d'un seuil prédéterminé.
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