Browse Prior Art Database

DYNAMIC DATA PACKET SIZING BASED ON REAL TIME MONITORING OF SYSTEM VOICE ACTIVITY

IP.com Disclosure Number: IPCOM000008209D
Original Publication Date: 1997-Jun-01
Included in the Prior Art Database: 2002-May-28
Document File: 1 page(s) / 86K

Publishing Venue

Motorola

Related People

Paul Bocci: AUTHOR [+3]

Abstract

The advent of conventional 2-way radio systems with integrated voice and data capability has brought about many technical challenges for providing a system that allows for acceptable data throughput while mmimiziig the effect of data traftic on voice users. This invention attempts to achieve the above goal through a method of dynamically sizing data packets based on the probability of future voice activity given the current state of voice activity.

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Technical Developments

DYNAMIC DATA PACKET SIZING BASED ON REAL TIME MONITORING OF SYSTEM VOICE ACTIVITY

by Paul Bocci, Stan Knapcryk, and George Popovich

INTRODUCTION

  The advent of conventional 2-way radio systems with integrated voice and data capability has brought about many technical challenges for providing a system that allows for acceptable data throughput while mmimiziig the effect of data traftic on voice users. This invention attempts to achieve the above goal through a method of dynamically sizing data packets based on the probability of future voice activity given the current state of voice activity.

DESCRIPTION

  Data performance is generally measured in throughput (i.e. How many data messages per hour can I send through the system?). By this measure, data performance in a 2-way radio system can be improved by increasing the maximum over the air data packet size (i.e. the amount of data a radio or station is allowed to transfer across the RF channel before it must relinquish control of that channel.). Voice performance, as it relates here, is measured in time to access the RF channel. The quicker a voice user can access a channel and start transmitting his voice message, the better the performance. By this measure, voice performance is improved by decreas- ing the maximum over the air data packet size.

  There is a tradeoff between voice and data performance in an integrated voice and data system that can be adjusted by changing the maximum over the air data packet size. The longer the data packet, the longer the possible delay to voice users. The shorter the data packet, the lower the data through- put due to fixed overhead. Existing data systems
(e.g. RDLAP systems) as well as data systems that will conform to the APCO 2.5 standard, define a static maximum over the air data packet size that is a compromise between the need for data perfor- mance and the need to avoid monopolization of the channel by a single radio.

  The concept of dynamically...