Ousted Honduran President Jose Manuel Zelaya, who has the backing of the UN and the entire international community, is to deliver a speech at the General Assembly session, which will run until Sep 30.
He is expected to thank the UN and the world community for their solidarity, said Reina.
The General Assembly approved in July a resolution condemning the coup in Honduras and the breaking of constitutional and democratic order in the Central American country and demanding the immediate and unconditional return of the Zelaya government.
Honduras plunged into a political crisis June 28 after the armed forces arrested Zelaya June 28 following a Supreme Court ban to hold a national referendum initiated by him. He was sent out of country and Roberto Micheletti was sworn in as new president backed by the army.