D2D Cooperative Communication Method for Energy Harvesting in OFDM Cellular Networks

Abstract

The invention discloses a D2D (device-to-device) cooperative communication method for harvesting energy in an OFDM (orthogonal frequency division multiplexing) cellular network. The method comprises following steps: S1, an idle D2D user is selected between a base station and cellular users who cannot be communicated with the base station normally and is taken as a relay node; S2, downlink signals to be sent to the cellular users are sent to the relay node by the base station, the cellular users send known signals to the relay node, and both processes adopt channels to be assigned to the cellular users by the base station originally; meanwhile, the relay node receives the signals in a power dividing manner, performs energy harvesting on a part of signals after division and performs information decoding on the other part of signals; S3, the relay node forwards information in the downlink signals to the cellular users by the aid of the harvested energy, and channels of other D2D pairs in a cell are reused in the forwarding process. According to the technical scheme, the relay node harvests energy from the base station and the cellular users simultaneously, and the energy harvesting efficiency is improved.

Description

technical field [0001] The invention relates to the field of mobile communication. More specifically, it relates to a D2D cooperative communication method for energy collection in an OFDM (Orthogonal Frequency Division Multiplexing) cellular network. Background technique [0002] In recent years, with the rapid development of mobile communication technology, business requirements such as high speed, low energy consumption, low delay, and personalization have brought new challenges to it, and promoted the academic research on emerging communication technologies. Device-to-Device (D2D) communication technology is a technology with great development prospects in future mobile communication systems. D2D communication technology can directly establish a communication link between terminals with a short distance, which can effectively reduce the load of the base station and improve the efficiency of data transmission. At the same time, as short-distance communication, D2D commun...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a D2D cooperative communication method for energy collection in an OFDM cellular network, using an idle D2D user as a relay node to forward the information in the downlink signal of the base station to the cellular user, and the relay node ensures the transmission of cellular information Under the premise, the energy in the signal is collected from both the base station and the cellular user at the same time, as the income when forwarding the information in the downlink signal, to solve the existing energy collection scheme, the relay node only collects energy from the source node or the destination node , due to the uncertainty of the location of the relay node, it may be far away from the energy supply source, which leads to the problem of low energy harvesting efficiency

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