Asynchronous Power Control Method for Small Cells in a Cooperative Cluster Oriented to Cell Amorphous Coverage

Abstract

The invention discloses an asynchronous power control method of community-oriented small base stations in collaboration clusters, without fixed coverage. In order to reduce the interference in the same layer, collaboration clusters are constructed among small base stations to service users positioned within a community range expansion region in a collaboration manner; when the positions of users are changed, the collaboration cluster can change the collaboration service range; meanwhile in order to reduce cross-layer interference, sending power of part of resources in the small base stations is improved, and the users positioned in the community range expansion region are dispatched on the resources; a macro base station dispatches users with good property on the part of reusable resources, so that the interference on the macro service users by the improvement of small base station power is reduced. The method optimizes the sending power of the small base stations and the corresponding resource ratio through a differential evolution algorithm, and can obviously improve the handling capacity of the users positioned in the community range expansion region in the condition that the macro user property is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of communication, and in particular relates to an asynchronous power control method for small base stations in a cooperative cluster oriented to cell amorphous coverage. Background technique [0002] In recent years, with the demand for new applications, the amount of wireless communication data has grown rapidly, and the traditional homogeneous cellular network of the macro base station structure has been unable to meet the communication needs. The advantages of co-existing heterogeneous networks in guaranteeing network coverage and improving network capacity have attracted extensive attention from both industry and academia. In a homogeneous network, the user selects the serving base station according to the received power of the strongest reference signal, but in a heterogeneous network, due to the large difference in transmission power between the macro base station and the small base station, according ...

AI Technical Summary

Problems solved by technology

In a homogeneous network, the user selects the serving base station according to the received power of the strongest reference signal, but in a heterogeneous network, due to the large difference in transmission power between the macro base station and the small base station, according to the same user access strategy, the macro base station will The load imbalance between the small base station and the resources of the small base station are not fully utilized, so cell range expansion is proposed to solve this problem, but the users connected to the small base station and located within the range of the cell range expansion receive more power from the macro base station than receive its services Therefore, the power of small base stations will be severely interfered by macro base stations; and with the intensive scheduling of small base stations, the same-layer interference between small base stations has become an urgent problem to be solved

[0003] In the existing technology, the management of the cross-layer interference between the macro base station and the small base station mainly considers inter-cell interference coordination. The macro base station configures almost blank subframes in some subframes, that is, the macro base station does not transmit data information in these subframes. , and the small base station schedules its cell range expansion users in the corresponding subframes, which improves the throughput of such users, but at the cost of sacrificing the resources of the macro base station; Instead of not transmitting data at all, it reduces its transmission power in some subframes, and the small base station schedules its cell range to expand users in these subframes, but these methods will cause waste of macro base station resources and reduce the coverage of macro base stations

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