Graph theory based multi-cell two-layer network spectrum allocation method

Abstract

The invention discloses a graph theory based multi-cell two-layer network spectrum allocation method. According to the method based on a multi-cell scene in long term evolution (LTE), a macro base station and a family base station coexist and share a platform of a frequency spectrum, a maximum independent set of a graph is obtained by a genetic algorithm, and the frequency spectrum is distributed for macro users to obtain a resource block proportion occupied by the macro users. The macro base stations on different resource blocks and small-scale fading have influence on family users, so that a plurality of interference patterns are established, and a good scheme dynamic allocation frequency spectrum is provided. The method has the advantages that the cross-layer interference and co-layer interference are reduced, the requirement of service quality of the macro users can be met, the total handling capacity of a system is increased, and the compromise between the handling capacity of edge family users and the total handling capacity of the family users is achieved.

Description

technical field [0001] The invention relates to a joint frequency spectrum allocation method of a multi-cell two-layer network based on graph theory, and belongs to the technical field of communication. Background technique [0002] In recent years, with the continuous development of mobile communication technology, the demand for high-speed data services has been increasing, and the number of users has also increased. If only relying on macro base stations, it cannot meet the service requirements of indoor users. Femtocells are being used more and more due to advantages such as low power consumption, convenient installation, and high signal quality. 3GPP's Long Term Evolution (LTE) project and Advanced Long Term Evolution (LTE-Advanced) project use home base stations to solve the problem of indoor coverage and improve system capacity and data rate. [0003] The LTE long-term evolution plan is a wireless access technology with strong competitive advantages. It is regarded a...

AI Technical Summary

Problems solved by technology

[0009] In the two-layer network model where macro base stations and femtocells coexist, if macro users and home users do not share spectrum, although cross-layer interference can be effectively avoided, femtocells can only use part of the spectrum, which is not conducive to the improvement of throughput

However, when the macro user and the home user share the spectrum, using the orthogonality between the subbands in the OFDM system can effectively eliminate the interference inside the macro cell and the home base station, but the home base station and the home base station, and the macro base station and the home base station are still will cause greater interference

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