Energy-saving dynamic frequency spectrum planning method in femtocell network

Abstract

The invention relates to an energy-saving dynamic frequency spectrum planning method in a femtocell network and provides an energy-saving dynamic frequency plan based on soft frequency reuse in a bilayer femtocell network, wherein an energy-consumption model of a downlink of a three-dimensional space femtocell bilayer network is established. According to the method disclosed by the invention, a soft frequency reuse scheme is adopted, interferences to macro cell users in a cell edge area are reduced, and the interruption rate of the edge users is reduced. Frequencies distributed to macro cell users and femtocell users in an internal area are orthogonal mutually, cross-layer interferences between a macro cell network layer and a femtocell network layer are avoided, the user distribution and business traffic distribution of the internal area and an external area of the macro cell are fully considered on the premise of guaranteeing QoS (Quality of Service) requirements of the users, the frequency spectra distributed to the macro cell users and the femtocell users are dynamically adjusted, the frequency spectrum utilization rate is increased, and thus, the energy utilization rate of the entire network is increased.

Description

technical field [0001] The present invention relates to the technical field of mobile communication, particularly, the present invention is used in the Femtocell (Femtocell) double-layer network in the next generation mobile communication system (LTE / LTE-Advanced) based on soft frequency reuse (Soft frequency reuse, SFR) ) energy-saving frequency planning method. Background technique [0002] At present, the third-generation mobile communication system has been widely used in commercial use. At the same time, the 9th version (Release-9) of the LTE standard, the evolution technology of UMTS (Universal Mobile Telecommunications System), has also been formulated at the end of 2010. The standard formulation (Release-11) of the next generation mobile communication system has been started, and the LTE-Advanced technology formulated by 3GPP is expected to be high. [0003] With the development of wireless communication technology, for the LTE system, the unique OFDMA access method...

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Problems solved by technology

[0008] The purpose of the present invention is to solve the problems of interference coordination and energy consumption between macro cells in femto cell upper layer network that cannot be well solved by existing frequency planning, and propose a dynamic frequency planning method based on soft frequency multiplexing and energy saving. Can effectively avoid interference between macro cells and reduce energy consumption

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