Browse Prior Art Database

TRANSCODER ROUTING OF FRAME RELAY VOICE PACKETS

IP.com Disclosure Number: IPCOM000007838D
Original Publication Date: 1996-Aug-01
Included in the Prior Art Database: 2002-Apr-29
Document File: 4 page(s) / 173K

Publishing Venue

Motorola

Related People

Kevin Kruse: AUTHOR [+4]

Abstract

The current RXCDR does not accept packet switched voice. The RXCDR has a dedicated chan- nel between the call processing BSC and the MSC via the RXCDR system to do the voice encoding/ decoding. The current RXCDR does no switching ofthe voice conversation dynamically. No BSC device has sufficient connections to the TDM highway to allow both the input of the 24 DSO(s) as one chan- nel and then the routing ofthe packets to the XCDR board over other TDM connections. Current digital cellular networks (e.g.: USDL, GSM, iDEN) use ded- icated bandwidth for each voice call and there is no mechanism to share bandwidth assigned to a voice call for other calls or services. The dedicated bandwidth is currently allocated at 16kbps while only 4.8kbps is actually used. This is a very inefficient allocation ofsystem resources.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 48% of the total text.

Page 1 of 4

MOlYlROLA Technical Developments

TRANSCODER ROUTING OF FRAME RELAY VOICE PACKETS

by Kevin Kruse, Mike Kloos, Hooman Kashef and Paul Erickson

BACKGROUND

                           tecture can not manage packet switching. A new The current Base Site Controller (BSC) in the packet switched system design will be needed to iDEN system uses circuit switching technology for implement this network. The current Remote control information and the voice conversation. The Transcoder System uses dedicated connections titure architecture ofthe ESMR network may include between the Transcoder Processing Board and the packet switching technology for voice, control and incoming voice circuits from the cells. The topology data. The current Remote Transcoder System archi- is shown in the following diagram.

TRANSCODER TRANSCODER DISTRJBUTION DISTRIBUTION DISTRIBUTTON DISTRIBUTIO

ROUTER ROUTER ROUTER PROCESSOR B PROCESSOR

Remote TrFUL5CGder system

Metro Packet Switch

Fig. 1 Transcoder System Packet Switching

  The enhanced Remote Transcoder System (RXCDR) will have multiple frame relay connec- tions for all packet switched communication instead of dedicated interfaces for each circuit. The RXCDR must accept these packets and switch them to the correct voice processor for decoding. The multiple DSOs from the Metro Packet Switch (MPS) are ter- minated to the TDM highway which must then be picked up by a device in the system as one channel

for distribution.

  This method provides maximum bandwidth uti- lization with a minimal amount of hardware. This method reduces the number of Tl connections in the system by using Packet Switching technology as the transport mechanism. The number of transcoders is also reduced by allowing the packet data to be switched to any idle voice processor.

c Mo,orola. 1°C. 1996 188 August 1996

[This page contains 14 pictures or other non-text objects]

Page 2 of 4

M-LA Technical Developments

THE PROBLEM

  The current RXCDR does not accept packet switched voice. The RXCDR has a dedicated chan- nel between the call processing BSC and the MSC via the RXCDR system to do the voice encoding/ decoding. The current RXCDR does no switching ofthe voice conversation dynamically. No BSC device has sufficient connections to the TDM highway to allow both the input of the 24 DSO(s) as one chan- nel and then the routing ofthe packets to the XCDR board over other TDM connections. Current digital cellular networks (e.g.: USDL, GSM, iDEN) use ded- icated bandwidth for each voice call and there is no mechanism to share bandwidth assigned to a voice call for other calls or services. The dedicated bandwidth is currently allocated at 16kbps while only
4.8kbps is actually used. This is a very inefficient allocation ofsystem resources.

  The current algorithm for processing the voice packets on the XCDR DSP will not work in the packet switched environment.

Transcoder System configuration will be changed to allow the voice packets to be switched to the cor- rect voice processor on a per pa...