-- Greater telephone access to his lawyers
-- Freedom from random prison searches
-- Freedom from having his phone conversations recorded
-- The right to meet with people besides his counsel
Lead defense attorney Frank Dunham confirmed the filing, but had no further comment.
Moussaoui, a French citizen of Moroccan descent, faces the death penalty. He is charged with four conspiracy counts linking him to Osama bin Laden's terrorist network.
He was taken into custody a month before the September 11 attacks, but some government investigators say he may have been the "20th hijacker," who was to have been aboard one of the planes that crashed into the World Trade Center, Pentagon or in rural Pennsylvania.
Moussaoui is being held under tight security at the Alexandria Detention Center in suburban Virginia, blocks from the federal courthouse where his trial is to be held.
Reporters were shown a typical cell where federal prisoners are held at the facility. The cell measures about 80 square feet, roughly nine by nine feet, just enough room for a concrete slab bed, stainless steel toilet and small sink.
Moussaoui and other high-profile prisoners at the Alexandria jail, including "American Taliban" John Walker Lindh, are kept in their cells all but one or two hours per day, according to prison officials. Their activities and movements are limited, and they are segregated from the rest of the prison population for their safety and that of other inmates, officials said.