An Enhanced Uplink Fractional Power Control Method for Micro Cells in Heterogeneous Networks

Abstract

The present invention relates to an enhanced uplink fractional power control method used for small cells in a heterogeneous network. The heterogeneous network comprises a macro cell and a plurality of small cells disposed in the macro cell. User equipments in the macro cell and user equipment in the small cells are respectively served by a macro base station and a Pico base station. The method comprises the steps of: A, setting, according to an allowable uplink interference magnitude of the macro base station and uplink interference of the small cells on the macro cell, an upper limit value P0(dBm, upper) of a power reference value of any user equipment served by a small cell m; B, defining an enhanced power reference value P0(dBm,constrained)=min(P0(dBm), P0(dBm, upper)) capable of constraining the uplink cross-layer interference of the small cells on the macro cell; and C, using the enhanced power reference value P0(dBm,constrained) in a conventional uplink fractional power control method, so as to more effectively control the transmitted power of the user equipment. Compared with the prior art, the present invention can effectively reduce the uplink interference of small cells on a macro cell, thereby improving the communication quality of a heterogeneous network in an LTE-A system.

Description

technical field [0001] The present invention relates to a microcell uplink power control method, in particular to an enhanced uplink fractional power control method for microcells in a heterogeneous network. Background technique [0002] In order to increase the capacity and / or coverage of a traditional cellular mobile communication network that only deploys macrocells (Marcocell), in an LTE-Advanced (referred to as LTE-A) system, it is considered that co-channel ( That is, co-channel) to deploy some low-power micro cells (ie, small cells), such as Pico cells; the resulting network is usually called a heterogeneous network (ie, heterogeneous networks, HetNets for short). [0003] When multiple micro cells that can be opened to all network users are deployed in the macro cell, some user equipments can be served by the micro cell, thereby reducing the burden of the macro cell and realizing load balancing. [0004] In the LTE-A system, regardless of whether it is a macro cell ...

AI Technical Summary

Problems solved by technology

Specifically, when a macro cell implements the FPC scheme to set the uplink power of the MUEs served by it, one or more micro cells deployed within its coverage area may simultaneously implement some The uplink power control scheme is used to adjust the uplink transmit power of some PUEs, so that the wireless communication transmission environment with broadcast characteristics changes (that is, the uplink wireless channel conditions corresponding to the macro cell change) ; This will cause the transmit power set by the macro cell for some MUEs according to the previous uplink channel conditions to become invalid, that is, the dynamic change of the uplink interference generated by the PUEs to the macro cell will be The power settings of these MUEs may not be able to meet the corresponding quality of service (Quality of Service, referred to as QoS) requirements

Similarly, the dynamic change of the uplink interference generated by MUEs to the micro cell will also cause the transmit power set by the micro cell for some PUEs to be ineffective.

[0021] Therefore, for the co-channel deployment scenario of macro cells and micro cells, the existing uplink power control scheme needs to be improved and enhanced, because the existing uplink power control scheme does not consider the relationship between the Macro layer and the Pico layer. The dynamic change of the uplink interference among them makes it impossible to ensure the service quality requirements of the uplink

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