INTERFERENCE MANAGEMENT AND DECENTRALIZED CHANNEL ACCESS SCHEMES IN HOTSPOT-AIDED CELLULAR NETWORKS

摘要

A system and method are provided wherein one or more femtocell base stations are deployed within a range of a cellular base station and utilize substantially the same frequency band as the cellular base station. Each femtocell base station may be configured to employ one or more interference avoidance techniques such that coexistence between the cellular and the corresponding femtocell base station is enabled. The interference avoidance techniques employed may include use of randomized time or frequency hopping; randomly selecting a predetermined number, or identifying one or more unutilized, frequency subchannels for signal transmission; using two or more transmit, and two or more receive antennas; nulling one or more transmissions in a direction of a nearby cellular base station user; handing off at least one cellular user to one of the femtocell base stations and vice versa; and/or reducing the transmission power of at least one femtocell base station.

主权项

1. A system comprising:
one or more low power base stations deployed in a secondary tier within a coverage range of a macro cellular base station, wherein the macro cellular base station utilizes a wireless frequency band and respective low power base stations utilize a wireless frequency band that is the same as the macro cellular base station wireless frequency band, and wherein respective low power base stations are configured to employ at least one cross-tier interference avoidance technique such that coexistence between the macro cellular base station and the corresponding low power base station is enabled, the at least one cross-tier interference avoidance technique comprising the use of two or more transmit antennas at the low power base station to null interference in the direction of a nearby macro cellular base station's user.