Performance Evaluation of Distributed Floor Control for Push-to-Talk Service
Date Issued
2007
Date
2007
Author(s)
Chen, Chun-Hao
DOI
zh-TW
Abstract
Push-to-talk (PTT) is a service that provides one-to-one or one-to-many group communication. PTT is similar with traditional walkie-talkie system; the main characteristic of PTT is that the session can be established easily by pushing a button without complicated configurations. At present, PTT service is provided on cellular network. However, the interoperability is bad due to the lack of common protocol. Since, the PoC (Push-to-talk over Cellular) project of OMA (Open Mobile Alliance) defines the protocol of PTT in cellular network. The PoC adopts centralized system architecture so that extra cost of maintaining server is required and scalability and reliability are limited by server. Different from PoC centralized approach, a distributed approach called iPTT is proposed. iPTT is a service model that adopts peer-to-peer technology, all the devices in iPTT are connected via internet. Floor control is an important function in PTT service. When more than one user wants to speak and pushes the button, the floor owner should be decided by the function of floor control. At present, some distributed floor control mechanisms are proposed. In this thesis, we propose some performance evaluation indexes for distributed floor control mechanisms. We try to observe the advantages and drawbacks of existing distributed floor control mechanisms through network simulation tool. We want to provide reference resources for people who will design new floor control approaches.
Subjects
隨按即說
網路電話
群組通話
分散式系統
發話權控制
push-to-talk
voice over IP
group communication
distributed system
floor control
Type
thesis
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