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Resumo Este artigo prop6e e analisa 0 desempenho de urn protocolo de retransmissao continua (Go Back-N ­ GB(N)) adequado para comunicacoes de dados via satelite a altas taxas de transmissao, Sua ideia chave e 0 receptor armazenar as mensagens fora de sequencia recebidas correta­ mente apes 0 envio de urn pedido de retransrnissao e 0 trans­ missor retransmitir rmiltiplas capias das mensagens recebidas com erro, inclusive daquelas enviadas em avanco, para agili­ zar suas recuperacoes e diminuir 0 mimero total de retrans­ missoes. Ao combinar 0 armazenamento das mensagens em avanco com a retransmissao de rmiltiplas capias das mensa­ gens reconhecidas negativamente, a estrategia reduz bastante, em relacao a outros protocolos de retransmissao continua, 0 mimero total de retransmissoes envolvido na transferencia de deterrninada quanti dade de informacoes. Os resultados nu­ mericos mostram que 0 protocolo proposto supera os me­ lhores resultados conhecidos para esquemas de retransmissao continua. Para ambientes com taxas de erros elevadas, 0 seu rendimento supera 0 desempenho de varies protocolos de re­ transmissao seletiva. Abstract This paper aims at presenting a variation of the Go-Back-N (GB(N)) ARQ protocol which operates with a receiver buffer and with multicopy retransmissions. The proposed strategy, that uses the key idea of the Weldon's scheme, avoids buffer overflows and reduces the effect of the round trip delay. Its throughput performance is analyzed using semi-Markov process. It improves significantly the throughput efficiency of the high speed satellite communications. The numerical results show that the new strategy presents a better performance than the best known GB(N) results. Furthermore, it outperforms many finite buffer selective-repeat ARQ, over a wide range of high bit error rates. The throughput efficiency remains in a usable range even for a very high error rate conditions. Palavras-chave: Interconexao de redes, redes ATM, PSTN, redes IP.

Um protocolo com Retransmissão Multicópias para Comunicações Via Satélite a Altas Velocidades