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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...
In this paper, a joint pilot and data power allocation problem with max-min fair energy efficiency (EE) guarantee in the uplink massive multiple-input multiple-output cognitive radio networks is investigated. Given the fractional objective function, channel estimation errors, and inter-user interference, the joint allocation problem is formulated as a nonconvex and NP-hard problem. To tackle this,...
In order to handle the cross-tier and co-tier interference effectively for LTE-A two-tier heterogeneous network, we propose a CSGC algorithm based partial spectrum sharing scheme using cognitive radio (CR) technique. In this paper, Radio resources are divided into three parts: macro-dedicated part, shared part and femto-dedicated part. Simulation result shows that the proposed scheme not only solves...
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