ITTC Project

ATM Adaptation Layer for Composite Users (AAL-CU) Research

Project Award Date: 01-01-1997


AAL-CU (ATM Adaptation Layer for Composite Users)
is a new AAL that is currently being discussed and standardized within the ATM Forum and ITU-T.

The intent is for AAL-CU to fill a need (not met by existing AALs) for multiplexing several small data units from different sources/connections into a single ATM VC connection. This will limit packetization delay for compressed voice without wasting transmission bandwidth due to partial filling of ATM cells.

The original motivation for AAL-CU 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 AAL-CU applications.

Proposed Project Goals

- Provide a detailed performance evaluation of the new AAL-CU, including comparisons with AAL1 and AAL5 alternatives, and recommendations for appropriate protocol parameter values.

- Provide an evaluation of the various impacts of this new protocol on the ATM control plane (e.g., signaling).

- Provide specific recommendations concerning the application of AAL-CU to wireless/cellular networks and concerning interworking of AAL-CU between wireless/cellular networks and fiber-optic ATM networks.

- Provide a technical assessment of AAL-CU's capabilities for other potential applications besides wireless/cellular.


Faculty Investigator(s): David Petr (PI)

Project Sponsors

Primary Sponsor(s): Sprint

Partner with ITTC

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