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Particle swam optimization-based heterogeneous network interference coordination method

A particle swarm optimization and interference coordination technology, which is applied in power management, wireless communication, electrical components, etc. to ensure global optimality and avoid inter-cell interference.

Inactive Publication Date: 2014-01-22
SOUTHEAST UNIV
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Problems solved by technology

[0003] The purpose of the present invention is to propose a heterogeneous network downlink interference coordination method based on particle swarm optimization in consideration of the actual constraints of the system, and solve the same-layer and cross-layer interference in the heterogeneous network by adjusting the transmission power of the pico station Inter-cell interference coordination problem, improving spectrum efficiency and maximizing overall system throughput without affecting the degree of freedom of subcarrier allocation

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  • Particle swam optimization-based heterogeneous network interference coordination method
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  • Particle swam optimization-based heterogeneous network interference coordination method

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Embodiment Construction

[0022] The carrier aggregation-based heterogeneous network interference coordination method of the present invention.

[0023] Taking the LTE-A system as an example to give an embodiment:

[0024] Such as figure 1 As shown, the heterogeneous network interference coordination method includes the following steps:

[0025] Initialize the network configuration and parameters: Assuming that there are β macro stations, ρ pico stations and U users participating in interference coordination, the initialization station set C={C m ,C p}, where the set of macro stations C m ={m 1 ,m 2 ,...,m β}, the sending power is P m , the set of pico stations C p ={p 1 ,p 2 ,...,p ρ}, its transmit power is adjustable, and the maximum transmit power is limited to Initialize the current number of iterations t = 0, the number of reinitialization s = 0, the maximum number of iterations and reinitialization are t iter , t res .

[0026] Step 1: Set various pico station candidate transmissi...

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Abstract

The invention relates to a particle swam optimization-based heterogeneous network down link interference coordination method in a wireless communication system. According to the method, the transmitting power of a picocell in a heterogeneous network is associated with the particle position of the particle swam optimization, and the particle swam optimization is used for adjusting the transmitting power of the picocell in a combined manner, so that the situation that a macrocell and a neighbor picocell are interfered seriously and the system performance is influenced as the picocell performs transmission by the maximal power is avoided; convergence of the optimizing process is guaranteed by limiting the value range of the inertia weight and the acceleration coefficient of the particle swam optimization; the optimal transmitting power of the picocell is guaranteed by initializing transmitting power set for many times; the actual limiting conditions of the system, such as flexibility of serving cells, dynamic change of transmitting power and limit of maximal transmitting power, are taken into consideration; same-layer and cross-layer interface can be avoided simultaneously; the degree of freedom of subcarrier allocation is not influenced while the spectral efficiency of the system is improved; the total throughput of the system is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of wireless resource management in mobile communication, and in particular relates to a particle swarm optimization-based heterogeneous network downlink interference coordination method in a wireless communication system. Background technique [0002] With the increasing demand for wireless services, 3GPP LTE-A (LongTerm Evolution-Advanced) proposes a heterogeneous network in which low-power small stations such as pico stations, femto stations, and relays are deployed within the coverage of macro stations. Although the deployment of low-power small cells can improve system capacity and coverage, it also brings serious interference problems, which limits the improvement of network performance. In addition, the conflict between network performance improvement and interference problems will be further strengthened with the increase of small cell density in the ultra-dense deployment low-power small cell scenari...

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Application Information

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IPC IPC(8): H04W52/24
Inventor 潘志文蒋慧琳尤肖虎刘楠
Owner SOUTHEAST UNIV
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