"Add your Edge rating to your test, either before or after the roll." (Push the Limit, p. 56)
This seems to mean that your Edge becomes part of your dice pool, rather than being a separate dice pool.
EDIT: This is from SR5. If we're talking SR4, the appropriate page is p. 74, where it refers to Edge dice as "additional dice" as opposed to a separate pool. Same end result, though.