Femtocell power control method based on interference limitation

A technology of home base station and interference limitation, applied in the field of communication, can solve the problems affecting user performance of home base station, transmission power user and macro user interference, etc., and achieve the effect of meeting interference limitation requirements, improving throughput and improving performance

Active Publication Date: 2012-11-14
CERTUS NETWORK TECHNANJING
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AI Technical Summary

Problems solved by technology

During downlink data transmission, if the transmission power of the home base station is too large, it will cause great interference to other home base station users and macro users, and if it is too small, it will affect the performance of the home base station user

Method used

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  • Femtocell power control method based on interference limitation

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Embodiment Construction

[0025] The utility function associated with the femtocell is:

[0026] (1)

[0027] in for the Femtocell users on channels letter-to-dry ratio, femtocell transmit power, is the interference value received by home user i from other home base stations, is a non-negative weight coefficient, is additive white Gaussian noise. The SINR of femtocell users is:

[0028] (2)

[0029] In the above formula for the first Femtocell user and the first The path loss between femtocells, is the transmit power of the macro base station, for the first The path loss between a home user and the macro base station. Considering the interference limitation of macro users, a third item can be added on the basis of this utility function, which is related to the interference of macro users. Because there is no interference between each subchannel, so as long as the user's performance on each subchannel is discussed, the problem of the present inv...

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Abstract

The invention relates to a femtocell power control method based on interference limitation and aims at achieving the purpose of improving the performance of a femtocell subscriber and limiting the interference on a macro subscriber by adjusting emission power of a femtocell through a power control algorithm based on a game model in an OFDMA (orthogonal frequency division multiple access) femtocell system. The requirements of interference limitation on the macro subscriber are introduced in the given utility function, wherein the Lagrange parameters are updated according to the sub-gradient method. Such utility function reflects both the performance of the femtocell subscriber and the threshold requirement of the interference on the macro subscriber. According to the power control method based on the utility function, the limitation requirement of the interference on the macro subscriber is also met while the throughput of the femtocell subscriber is effectively increased.

Description

technical field [0001] The invention relates to a power control distribution realization scheme especially used in an OFDMA two-layer network, and belongs to the technical field of communication. [0002] Background technique [0003] With the continuous development of the communication industry, there are more and more users, and the communication requirements of macro cells are getting higher and higher, and the coverage problems of users in the cells need to be better solved. Studies have shown that in macrocells, about 2 / 3 of voice services and more than 70% of data services occur indoors. And as people's demand for data services increases, this ratio will further increase. Electromagnetic waves penetrating buildings will suffer a large penetration loss, resulting in a significant drop in signal quality. Therefore, how to provide quality assurance for such a high proportion of indoor communications is a problem that communication personnel must face. The quality of in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W52/14H04L27/26
Inventor 朱琦裴孝贞朱洪波杨龙祥
Owner CERTUS NETWORK TECHNANJING
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