Position-information-based device-to-device (D2D) clustering multicast method

Abstract

The invention discloses a position-information-based device-to-device (D2D) clustering multicast method in a cellular network. The method comprises the following operation steps that: terminals upload own geographical position, transmission distance and residual energy information to a base station; the base station clusters the terminal by using a geographical-position-based clustering method according to the obtained information of all the terminals in a D2D area, and transmits clustering information to all the terminals; and after all the terminals receive the clustering information, two-hop transmission is realized by adopting a multicast transmission mode to ensure that all the terminals in the area can reliably receive data from a source terminal. According to the method, network layer topology and a multicast transmission technology are combined, so that the method is low in computational complexity, easy to implement and quite favorable for the realization of D2D communication in the cellular network, a D2D communication effect in a scenario with a plurality of terminals is greatly improved, the transmission energy consumption of the terminal is reduced to a certain extent, an energy utilization rate is increased, and terminal running time in the D2D communication is prolonged. The method has broad popularization and application prospect.

Description

technical field [0001] The invention relates to a clustering multicast method used in a terminal-to-terminal D2D (Device-to-Device) communication system based on geographic location information in a cellular network, and belongs to the technical field of mobile communication. Background technique [0002] Today, the third-generation mobile communication technology has been put into commercial use. The 3rd Generation Partnership Project 3GPP (The 3rd Generation Partnership Project) research work on Long Term Evolution (Long Term Evolution) and LTE subsequent evolution LTE-A (LTE-Advanced) Gaining more and more investment and attention, D2D (Device-to-Device) communication also came into being. [0003] D2D communication is a new type of technology that directly communicates between terminals through reuse of cell frequency resources under the control of the cellular system. D2D communication in the cellular network can increase the spectrum efficiency of the cellular communic...

AI Technical Summary

Problems solved by technology

The first two clustering methods are simple to calculate, easy to implement, and fast to converge. However, the number of cluster heads is too large, and it lacks fairness when used in a network with limited energy such as a multicast network, which is not conducive to D2D communication.

Although the third clustering method reduces the number of cluster heads, it does not consider the cluster head load, which makes the cluster head terminals easily die due to excessive power consumption

[0007] When the number of network terminals is large, due to the low transmission efficiency of the traditional two-two combination D2D communication method and occupying a large amount of time-frequency resources, how to adapt to the development needs of D2D communication under the condition of multicast sending data, That is to say, proposing a new clustering multicast transmission method that can adapt to the scene with a large number of terminals, improve the efficiency of D2D communication, save energy consumption of terminals and prolong its running time has become a new topic of concern for scientific and technological personnel in the industry.

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