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In this paper,we assume that a device-to-device (D2D) bidirectional relay network is deployed in a cellular network.Each D2D two-way relay is equipped with two transmit antennas,which are respectively carried out at the same time with base station and receiver.Under the assumption that D2D two-way relay adjust power transmission amplification,we propose a power allocation scheme of the two-way relay network.The simulation results show that the scheme proposed can obtain larger two-way relay network throughput than the random power allocation and the traditional communication methods.

In this paper,we discuss the interference between channels in the adjacent small-cells in the LTE-A small-cell networks.We present a small-cell group close (SCGC:Small Cell Group Close) approach according to above discussion.System-level simulation results show that SCGC can not only reduce small-cell interference with adjacent channels,but also reduce power consumption.We can conclude that SCGC can get greater throughput.

By reusing the the spectrum in cellular network that has been used to increase the spectrum utilization ,reduce the base station load,and at the same time by using the location-based D2D mode selection and resource allocation algorithm,to reduce same frequency interference between the users and reduce transmission power from users.The simulation results show that,compared with the traditional communication in cellular network and resource allocation with random model,the location-based D2D mode selection and resource allocation can improve the capacity of system,and reduce the interference between the users.

In order to control the level of interference among adjacent small-cells effectively,in this paper,we suppress the interference between adjacent small-cells through controlling the small-cell downlink transmission power.Meanwhile,we use a low complexity subcarrier allocation scheme,making small-cell downlink rate be improved as much as possible.In small cell downlink transmission power control,we use a generalized water-filling algorithm which gives the optimal solution of downlink transmission power.Simulation results show that subcarrier allocation scheme and power allocation algorithm can improve small-cell downlink transmission rate and control the level of interference between adjacent small-cell effectively.