Abstract
Tills paper analyzes voice transmission capacity on ad hoc networks by performing simulations related to delay, jitter, loss rate, and consecutive losses. We evaluatethe influence of mobility and quality of service provisioning on the number of voice transnlitting sources. Another issue addressed in this paper is the effect of node density in voice transmission. Results show that we can achieve up to 22% ofimprovement in the capacity of voice transmission when the medium access time is reduced by service differentiation on the MAC layer. Moreover, mobility and network load variations can degrade up to 60% the network capacity of voice transmission, mainly on multihop mobile networks.
Highlights
Tills paper analyzes voice transmission capacity on ad hoc networks by performing simulations related to delay, jitter, loss rate, and consecutive losses
As redes ad hoc apresentam diversas vantagens como, por exemplo. a grande flexibilidade, pois podem ser formadas rapidamente mesmo em lugares ermos, o baixo custo de instalac;ffo e a robustez, pois podem resistir a catristrofes da natureza e a situac;6es de destruic;fio por motivo de guena
A amilise das perdas em rajada revelou que as perdas de apenas um pacote e de dais pacotes consecutivos representam a maior parte das perdas em rajadas tanto nos cemirios de comunicac;fi.o direta quanta nos de mUltiples saltos
Summary
A comunicac;fio sem fio permite a mobilidade, proporcionando uma maior flexibilidade, alem de possuir urn baixo custo de instalac;ffo se comparado ao custo das redes com fio. A grande desvantagem das redes ad hoc, sobretudo das redes de mliltiplos saltos, 6 o fato das estac;Oes serem mais complexas, isto porque alem de ter que implementar urn mecanisme especffico de controle de acesso ao meio e mecanismos para evitar os problemas de terminais expostos e escondidos, cada n6 deve agir como urn roteador. A partir dos resultados obtidos, os autores propuseram urn mecanisme lu'brido de acesso ao meio que utiliza o DCF e o PCE e 0 principal objetivo deste rutigo realizru· uma amilise da capacidade de transmissao de voz em redes ad hoc, levando em considerac;ao par
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