Voice Transport Over ATM
Project Award Date: 06-01-1998
There has been a recent resurgence of interest in transporting voice over ATM, sparked in part by the introduction and standardization of AAL2, a new ATM Adaptation Layer (AAL) that fills a need (not met by previous AALs) for multiplexing several small data units from different sources/connections into a single ATM VC connection. This limits packetization delay for compressed voice without wasting transmission bandwidth due to partial filling of ATM cells. The original motivation for AAL2 was to support compressed voice as found in many cellular systems, but voice trunking and ATM to the desktop have since been added as potential AAL2 applications.
The intent of this two-year project is to expand our current studies of AAL2 into the broader arena of Voice Transport over ATM. Another proposal from ITTC (AAL2 Call/Correction Control Signaling, with Joseph Evans as Principal Investigator) will focus on signal/control and implementation issues for AAL2.
The goals below are listed in approximate order of priority. As the project evolves over its two-year length, goals may be revised, deleted, or added as mutually agreed.
o Provide a performance characterization for compressed voice over AAL2, especially in terms of delay jitter (packet delay variation).
o Provide an assessment of potential voice service quality under various connection composition scenarios, including wireless/cellular segments.
o Provide an overall system-level plan for end-to-end Voice Transport Over ATM under various connection composition scenarios, including wireless/ceIIular segments.
o Provide specific recommendations concerning the application of AAL2 to wireless/cellular networks and concerning interworking of VTOA between wireless/cellular networks and fiber-optic ATM networks.
o Specify (as needed) and evaluate appropriate Service-Specific Convergence Sublayer (SSCS) protocols for VTOA using AAL2 (and perhaps AAL1).
o Provide performance evaluations of Voice/Data integration with AAL2.
Faculty Investigator(s): David Petr (PI)