Method and apparatus of fractional power control in wireless communication networks

摘要

A method is provided for dynamically updating the fractional power control (FPC) parameters of a wireless network such as an LTE network, so that system performance can be improved in a variety of different loading conditions, particularly under conditions of moderate or light loading. An exemplary embodiment includes obtaining a current value of a time-varying uplink interference figure for at least one individual sector s. For at least one such sector s, a value is selected for at least one FPC parameter, thereby to determine a dependency of the target SINR {circumflex over (γ)}(k,s) on the path loss λ(k,s) for each UE k in sector s for which {circumflex over (γ)}(k,s) falls between a maximum target {circumflex over (γ)}max and a minimum target {circumflex over (γ)}min. The selecting step is responsive to the obtained interference figure, such that at least one FPC parameter.

主权项

1. A method of uplink power control in a wireless network, of the kind in which a target signal-to-interference-and-noise ratio (target SINR) ŷ(k,s) for a UE k in a sector s, wherein k and s are positive integer indices, depends on a path loss λ(k,s) between UE k and a NodeB serving sector s and is governed at least in part by a maximum SINR target ŷmax, a minimum SINR target ŷmin, and a parameter α that determines how rapidly the target SINR will vary with path loss over a range spanning at least some path loss values, comprising:
obtaining a current value of a time-varying uplink interference figure for at least one individual sector s; assigning, for at least one of the at least one individual sector s, the respective current value to a corresponding category of a plurality of categories, each of the plurality of categories being associated with a determined severity of a current interference condition, each of the plurality of categories being associated with a respective predetermined value for at least one of ŷmax, ŷmin, and α; and for at least one of the at least one individual sector s, selecting the respective predetermined value for at least one of ŷmax, ŷmin, and α corresponding to the assigned corresponding category of the plurality of categories to determine a dependency of ŷ(k,s) on the path loss λ(k,s) for at least some UEs k in sector s.