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Multiuser access is a critical issue in distributed cognitive radio networks (DCRNs), as the collisions among the competing secondary users (SUs) may decrease the network throughput significantly. In order to reduce the collisions, we propose a dynamic backoff algorithm to find an optimal backoff contention window to maximize the network throughput and reduce the channel access delay. Based on the...
Aiming at dynamic changes of network topology, high real-time security services and high network load in VANETs, this paper proposes an adaptive TDMA slot allocation strategy based on beacon messages (BMA strategy). BMA strategy makes full use of neighbor nodes' beacon messages, including vehicular direction, position, velocity, etc. Meanwhile, each vehicle establishes neighbor table containing beacon...
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