Inter-cell power control method based on long term evolution (LET) heterogeneous service network

Abstract

The invention discloses an inter-cell power control method based on a long term evolution (LET) heterogeneous service network, mainly for solving the low throughput problem of a cell edge user. The method comprises the following realization steps of: (1) dividing a service cell and defining a service type; (2) presetting a resource block number, a service priority and a maximum time delay of each type of service; (3) sorting the resource blocks within a system frequency band; (4) dividing a public frequency pool from the sorted system frequency band; (5) calculating the edge service load index of each cell and determining the dividing manner of the public frequency pool; (6) regionalizing the cell centre, and defining a resource allocation index for each region; (7) allocating the resource blocks to the edge user first, and then allocating the resource blocks to the centre user according to the resource allocation index in each cell; (8) allocating a transmit power for all the resource blocks. By the invention, the cell edge throughput and the system total throughput are improved, so the invention can be applied to the technical field of wireless communication.

Description

technical field [0001] The invention belongs to the field of wireless communication and relates to interference coordination between network cells, in particular to a downlink power control method between cells combined with multi-point coordination, which can be used in LTE heterogeneous service networks. Background technique [0002] In the LTE network, when adjacent cells use the same frequency resources, inter-cell interference will occur, which seriously affects the performance of the LTE network. In order to eliminate inter-cell interference, increase the data rate of cell-edge users, and improve the throughput and average spectrum efficiency of the entire system, various inter-cell interference elimination technologies were analyzed during the LTE technology research. There are currently three interference elimination methods: inter-cell interference randomization algorithm, inter-cell interference elimination algorithm and inter-cell interference coordination algorit...

AI Technical Summary

Problems solved by technology

[0007] (1) The traditional SFR scheme does not consider the diversity of business types and diverse QoS requirements, but adopting different QoS levels for different users or for each business flow is an important feature of future broadband wireless communication systems

[0008] (2) The traditional SFR scheme is a static inter-cell interference coordination mechanism, which cannot re-adjust the frequency resources as the traffic load at the edge of each cell or the hotspot area changes in the network, which greatly limits its performance

[0009] (3) The traditional SFR scheme simply divides the cell into a central area and an edge area, and adopts a complex non-overlapping frequency resource allocation scheme at the edge of adjacent cells to reduce co-frequency interference from the edge areas of adjacent cells. Regional resource allocation is relatively simple in design

[0010] (4) The traditional SFR scheme adopts a simple power control algorithm. In order to improve the throughput performance of edge users, this scheme reduces the transmit power of the base station in the center user's applicable resource block, but improves the base station's available resource block in the edge user. The transmit power on the resource block, which makes the throughput performance of the central user greatly degraded, and the scheme does not consider the fading of different users

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