Browse Prior Art Database

MOBILE-TO-MOBILE HANDOVER ESTIMATION FOR OPTIMAL AUDIO DELAY

IP.com Disclosure Number: IPCOM000009533D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Aug-30
Document File: 6 page(s) / 204K

Publishing Venue

Motorola

Related People

Authors:
Michael Kloos Michael Bychowsky

Abstract

In order to eliminate the negative effects of tar- dem vocoding (increased delay and degraded audio), iDEN uses a protocol to bypass the vocoders in the infrastructure so that compressed VSELP audio is passed between the transcoders (XCDR) instead of PCM. The result is that a virtual point-to- point connection between the two BR's is created. The JITA algorithm is used within the iDEN system to reduce outbound delay for land to mobile calls. This is accomplished by having the BR send a cor- rection value to the XCDR so it can delay its encoder timing (while introducing a discontinuity) so packets are sent to the BR "Just in Time).