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When supporting both voice and TCP in a wireless multi-hop network, there are two conflicting goals: to protect the VoIP traffic, and to completely utilize the remaining capacity for TCP. The authors investigate the interaction between these two popular categories of traffic and find that conventional solution approaches, such as enhanced TCP variants, priority queues, bandwidth limitation, and traffic shaping do not always achieve the goals. TCP and VoIP traffic do not easily coexist because of TCP aggressiveness and data burstiness, and the (self-) interference nature of multi-hop traffic. They found that enhanced TCP variants fail to coexist with VoIP in the wireless multi-hop scenarios.
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