A User Selection Algorithm Used in Heterogeneous Networks

A heterogeneous network and user technology, applied in the field of heterogeneous networks, can solve problems such as the limitation of the number of users, the inability to obtain the capacity gain of the MIMO system, and the lack of consideration of channel quality information, etc., and achieve the effect of reducing cross-class interference and optimizing cross-class interference

CN105246130BActive Publication Date: 2019-04-05NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2019-04-05

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Abstract

The invention provides a user selection algorithm for a heterogeneous network, and the algorithm comprises the steps: calculating the chordal distances of interference channel matrixes between a macro base station and all users in a cell; selecting a user which enables the directions of the interference channel matrixes to remain parallel, i.e., enabling the user with the minimum chordal distance between the interference channel matrixes to serve as a service user. According to the invention, the algorithm takes the chordal distances as direction measurement indexes for the channel matrixes, further takes a weighted value as a measurement index, enables the interference channel matrixes to remain parallel as much as possible through considering the characteristics of a multi-base-station cooperation system, and optimizes the interference between hierarchy-crossing cells between a macro honeycomb and a micro honeycomb, so as to achieve a purpose of enabling the interference with users of the cell from the macro cell to be minimum.
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Description

technical field

[0001] The invention relates to the field of hierarchically covered heterogeneous networks, in particular to a user selection algorithm used in heterogeneous networks. Background technique

[0002] The heterogeneous network with hierarchical coverage is an important direction for the development of mobile communication networks. In the LTE-Advanced system, the coverage of the system can be improved through internal heterogeneous network structures such as relays, microcells, and home cells. However, due to the overlapping coverage formed in the heterogeneous wireless network, the network environment becomes relatively more complex, and the resulting inter-cell interference problem cannot be ignored. The cross-level inter-cell interference (cross- tierinter-cell interference) has become the bottleneck of heterogeneous network performance improvement, how to suppress the interference in heterogeneous wireless networks has obviously become the current research ...

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Embodiment Construction

[0048] The technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0049] Such as figure 1 The heterogeneous wireless network system shown includes a macro base station and L micro base stations, and the macro base station serves K M users, the micro base station serves K in the micro cell l users, K M The number of users serving the macro cell for the macro base station, K l is the number of users in the micro cell that the micro base station can serve; K represents the number of users to be selected for each micro base station; the macro base station configures N M transmit antennas, each micro base station is configured with N P transmit antennas, each user configures N U receiving antennas; assuming that the micro base stations are isolated from each other (isolated pico-cells), that is, the interference between the micro cells can be ignored; and because the power of the m...