Enhanced uplink fractional power control method used for microcells in heterogeneous network

Abstract

The invention relates to an enhanced uplink fractional power control method used for microcells in a heterogeneous network. The heterogeneous network comprises a macro cell and a plurality of microcells disposed in the macro cell. User equipment in the macro cell and the microcells respectively provides service to a macro base station and a micro base station. The enhanced uplink fractional power control method comprises the steps that: A, according to an allowable uplink interference magnitude of the base station and the interference condition of the microcells to uplinks of the macro cell, the upper limit value of a power reference value of any user equipment served by a microcell m is set; B, an enhanced power reference value capable of inhibiting the cross-layer interference of the microcells to the uplinks of the macro cell is defined; and C, in a conventional uplink fractional power control method, the enhanced power reference value is adopted, so that the emission power of the user equipment is more effectively controlled. Compared with the prior art, the interference of the microcells to the uplinks of the macro cell is effectively reduced, and the communication quality of the heterogeneous network in an LTE-A system is improved.

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 may simultaneously perform 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 (that is, 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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