WASHINGTON — The chairman of the Federal Communications Commission will propose new rules to encourage an open Internet, including prohibiting companies that provide broadband service to consumers from blocking any sites or services.

The proposals, to be introduced by Tom Wheeler, the chairman of the commission, will also include measures that will seek to prohibit Internet service providers from discriminating against any providers of Internet content. A federal appeals court ruled last month that the F.C.C.'s previously carried out Internet rules that illegally treated Internet service providers as regulated utilities, or common carriers, such as telephone service.