Inter-carrier interference management in dedicated channel femtocell networks
AssigneeNtt Docomo, Inc.
InventorsAlphan Sahin, Ismail Guvenc, Huseyin Arslan
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Abstract
In one embodiment, a method of mitigating uplink inter-carrier interference (ICI) from macrocell mobile stations at a dedicated channel femtocell base station is provided that includes: determining a timing offset for a femtocell uplink symbol timing that reduces the ICI based upon an expected spatial distribution for the macrocell mobile stations with respect to the femtocell base station; communicating the timing offset to at least one femtocell mobile station; and at the femtocell base station, receiving an uplink symbol transmission from the at least one femtocell mobile station according to the timing offset.
Claims15
A method of mitigating uplink inter-carrier interference (ICI) from macrocell mobile stations at a dedicated channel femtocell base station, comprising:
- determining a timing offset based upon an expected spatial distribution of the macrocell mobile stations and expected transmission powers for the macrocell mobile stations that balances maximizing a subset of the macrocell mobile stations included within a zero-ICI region with minimizing an ICI power received at the dedicated channel femtocell base station from a remaining portion of the macrocell mobile stations that are not within the zero-ICI region;
- communicating the timing offset to at least one femtocell mobile station;
- and
- at the dedicated channel femtocell base station, receiving an uplink symbol transmission from the at least one femtocell mobile station according to the timing offset.
A dedicated channel femtocell base station, comprising:
- a processor configured to determine a timing offset with respect to uplink transmissions from a plurality of macrocell mobile stations that maximizes a subset of plurality of the macrocell mobile stations within a zero inter-carrier interference (ICI) region and minimizes an ICI power received at the dedicated channel femtocell base station from a remaining portion of the plurality of macrocell mobile stations, wherein the processor is further configured to determine the timing offset with regard to an expected distribution of the macrocell mobile stations and expected transmission powers from the macrocell mobile stations;
- and
- a memory for storing the timing offset.
Dependencies are inferred from the claim text.