Systems and methods for interference mitigation in heterogeneous networks

摘要

Disclosed systems and methods mitigate interference in heterogeneous networks. Embodiments include adaptive or selective inter-cell interference coordination, adaptive multi-user zero forcing, adaptive power, and/or combinations of the foregoing. Techniques may be used to favor one group of users (e.g., femto users or macro users) over another. Certain embodiments focus quality of service (QoS) improvements on a first group of users, while using constraint processes to provide a threshold QoS for a second group of users.

主权项

1. A non-transitory machine readable storage medium having stored thereon instructions, which when executed by a processor, cause the processor to perform a method for interference mitigation in a heterogeneous network including one or more femto cells within a macro cell coverage area, the method comprising:
detecting, at a femto station, a macro user equipment (UE) operating within a femto coverage area of the femto station and a macro transmission channel toward the macro UE, wherein a measured first signal power of a macro UE received at the femto station is greater than a second signal power of the macro UE received at a macro station, the second signal power indicated in a message received by the femto station; and in response to detecting the macro UE:
estimating the macro transmission channel toward the detected macro UE;calculating an orthogonal transmission channel to the estimated macro transmission channel, the orthogonal transmission channel calculated to reduce or minimize a femto transmission interfering with the macro transmission channel; andselecting the orthogonal transmission channel for the femto transmission;determining a beamformed signal for the femto transmission to reduce or minimize transmission toward the detected macro UE;beamforming, using multiple antennas of the femto station, the femto transmission from the femto station according to the orthogonal transmission channel and beamformed signal to reduce or minimize the femto transmission interfering with the detected macro UE.