Uplink interference coordination method and device
A technology of interference coordination and equipment, applied in the direction of shaping network, power management, electrical components, etc. in the transmitter/receiver, it can solve the problems of interference submersion, waste of spectrum resources, low spectrum utilization rate of edge users, etc., to reduce the frequency Submerge and reduce the effect of uplink interference
Inactive Publication Date: 2016-01-13
BEIJING UNIV OF POSTS & TELECOMM
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[0014] However, there are obvious deficiencies in this scheme: First, the spectrum utilization rate of edge users is low
Second, the soft frequency reuse scheme cannot change with the change of the load distribution in the cell, which will lead to a phenomenon of excess frequency in the central area and a shortage of frequency in the edge area, which will seriously reduce the capacity and spectrum efficiency of the entire cell. waste of
However, in this scheme, the interference coordination between cells relies too much on the interference indication information transmitted on the X2 interface
When there are many edge users in a cell, more resource blocks are sent to adjacent cells as HII. Excessive signaling interaction increases system overhead, increases the processing difficulty of the base station, and does not take advantage of system stability.
At the same time, due to the unique transmission delay of X2, there is a certain lag in the interference indication information, so the interference indication information received by the base station at this moment may not be the resource that needs interference coordination at the current moment, which reduces the accuracy of interference coordination
[0020] Due to the particularity of uplink interference different from downlink interference, the existing algorithms ignore the unique problems of uplink interference: first, the service quality of users in the center of the cell decreases; second, the phenomenon of "interference flooding" in the interfered cell
[0030] 2. Interference flooding
[0034] Obviously, because the user is in different geographic locations, it will have different impacts on the subcarriers. However, the information whether a user is an edge user is not enough to judge the interference area of the user, and cannot help the base station allocate suitable subcarriers for it. resources to reduce the interference of the user to the disturbed base station, so if the interference of the edge user to the surrounding base stations is not considered, the above-mentioned "interference flooding" phenomenon may occur in the central cell, which reduces the service quality of the central cell
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[0075] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the invention are illustrated. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an unreasonable limitation of the present invention.
[0076] In the uplink interference environment, since the attributes of the "center" and "edge" of the user cannot reflect the interference of the user to each adjacent cell, the phenomenon of being overwhelmed by the interference of the interfering cell is easy to occur.
[0077] However, there is no mature uplink interference coordination scheme at present, and neither the existing soft frequency reuse scheme nor the coordination scheme based on interference indication can solve the problem of interference submersion existing in the uplink interference. Therefore, the present invention provides an uplink inte...
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The invention discloses an uplink interference coordination method equipment thereof. The method comprises the following steps that: a base station determines an interference area of a user terminal according to a pilot signal intensity of an adjacent cell and a maximum transmitting power spectral density of the user terminal, wherein the pilot signal intensity is measured by the user terminal; a type of the user terminal is determined according to the interference area of the user terminal; and a priority level of the user terminal for using a base station frequency resource is determined on the basis of the type of the user terminal. According to the invention, an interference area of a user terminal is determined through a pilot signal intensity of an adjacent cell and a maximum transmitting power spectral density of the user terminal, wherein the pilot signal intensity is reported by the user terminal; and then on the basis of the an interference situation of the adjacent cell by the user terminal, various priority levels for using frequency resources are determined for different user terminals, so that uplink interference between cells is reduced and thus an occurrence of a phenomenon of frequency overwhelming is reduced.
Description
technical field [0001] The present invention relates to OFDMA / SC-FDMA cellular networks, and more particularly, to an uplink interference coordination method and device. Background technique [0002] In a mobile communication network constructed with Orthogonal Frequency-Division Multiple Access (OFDMA) / Single Carrier Frequency-Division Multiple Access (SC-FDMA) as multiple access methods, the frequency reuse between cells The factor is 1, that is, all cells within the coverage of the entire system can use the same frequency band to serve users in this cell. Since the frequencies used by users in a cell are orthogonal to each other, it can be considered that all interferences come from other cells. In this way, on the one hand, the signal-to-interference-noise ratio of users in the center of the cell is greatly improved, and the service quality of users in the center is improved. Frequency interference results in poor service quality and low throughput for cell edge users....
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IPC IPC(8): H04W52/24H04W72/10H04L25/03
Inventor王卫东周岩桑媛沈雪李凡张英海
OwnerBEIJING UNIV OF POSTS & TELECOMM