Dynamic spectrum allocation method and device

Abstract

The invention discloses a dynamic spectrum allocation method and device. The dynamic spectrum allocation method includes dividing each transmission frame into a first sub frame and a second sub frameand allocating signals to all D2D users and cellular users in the first sub frame; selecting one D2D user from all D2D users decoding successfully according to a preset selection rule in a condition that at least one D2D user performs signal decoding successfully and sending the signals to the cellular users through the selected D2D user in the second sub frame; combining the signals sent in the first sub frame and the signals sent in the second sub frame by the cellular users. By adopting the above technical scheme, in the premise of ensuring normal communication of the cellular users, D2D users assist the cellular users in transmission and thus frequency spectrum resource allocated to the D2D users is increased with the acquired system gain, so that more effective utilization of frequency spectrum is realized.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a dynamic frequency spectrum allocation method and device. Background technique [0002] D2D (Device-to-Device, inter-device) communication is also called proximity discovery technology, which means that when the distance between the terminals that need to communicate is relatively close, the two can establish a direct link for data transmission under the control of the base station. A communication method that can not only reuse the frequency bands of cellular users through spectrum sharing, but also reduce the system overhead burden caused by base station forwarding through direct device connection to a certain extent, thus realizing green communication. [0003] At this stage, D2D communication is difficult to achieve independent deployment due to factors such as the failure of operators to reach an agreement on charging rules. Therefore, using D2D communication in the e...

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Problems solved by technology

[0003] D2D communication is difficult to achieve independent laying due to the unanimous management and charging rules of operators at the present stage. Therefore, using D2D communication in the existing cellular network to improve the spectrum utilization of the system can effectively use spectrum resources and achieve mitigation. The purpose of the scarcity of spectrum resources, for example, the traditional solution is that D2D users reuse the spectrum of cellular users with extremely small power, and use low-power and short-distance communication in the system in a form similar to substrate noise (Substrate D2D Transmission, referred to as SDT, D2D underlying transmission), however, the spectrum utilization rate in the prior art scheme is low

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