code: public function fileRename($cpw = "", $oldname = "/", $newname = "/", $tcid = null, $tcpw = null)
      {
          return $this->getParent()->channelFileRename($this->getId(), $cpw, $oldname, $newname, $tcid, $tcpw);
      }
docs: Renames a file in the channels file repository. If the two parameters $tcid and $tcpw are specified, the file
  will be moved into another channels file repository.
  
  @param  string $cpw
  @param  string $oldname
  @param  string $newname
  @param  integer $tcid
  @param  string $tcpw
  @return void