US 9,854,589 B2Granted

Interference management and interference alignment in wireless networks

AssigneeInterDigital Patent Holdings, Inc.

InventorsShahrokh Nayeb Nazar, Afshin Haghighat, Lujing Cai

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Abstract

Interference mitigation (e.g., interference suppression and/or interference cancellation) in a wireless communications system may include interference alignment techniques. Interference alignment may be performed to concurrently mitigate the effects of multiple types of interference (e.g., inter-cell interference and intra-cell interference). Interference management using interference alignment may enhance spectral efficiency in an interference-limited communications system, such as a wireless communications system (e.g., a cellular system). Interference alignment techniques may be applied to a homogeneous wireless communications system (e.g., including one or macro base stations). Interference alignment techniques may be applied to a heterogeneous wireless communications system (e.g., including one or macro base stations and one or more overlaid low-power nodes, such as small cells, remote radio heads (RRHs), or the like).

Claims18

Dependent claims

A method for mitigating interference received at a user equipment (UE) that is associated with a macrocell of a wireless communication system, the method comprising, by the UE:

measuring first interference received at the UE, the first interference generated by a transmission from a base station of the macrocell;
measuring second interference received at the UE, the second interference generated by a transmission from a second source of interference that is not a device of the macrocell;
generating a first channel state information (CSI) matrix based on a first CSI measurement performed on a first link between the UE and the second source of interference that is not a device of the macrocell;
calculating a receiver weight vector based on the first CSI matrix corresponding to the first link between the UE associated with the macrocell and the second source of interference that is not a device of the macrocell;
generating a second CSI matrix based on a second CSI measurement performed on a second link between the UE and a distributed antenna of the macrocell;
generating a third CSI matrix based on a third CSI measurement performed on a third link between the UE and the base station;
and
sending a feedback report to the base station of the macrocell, the feedback report including the receiver weight vector based on the first CSI matrix corresponding to the first link between the UE associated with the macrocell and the second source of interference that is not a device of the macrocell, the second CSI matrix corresponding to the second link between the UE and the distributed antenna of the macrocell, and the third CSI matrix corresponding to the third link between the UE and the base station of the macrocell.

5 more elements

A user equipment (UE) that is associated with a macrocell of a wireless communication system, the UE comprising:

a processor;
and
a memory comprising instructions that when executed by the processor cause the UE to:
measure first interference received at the UE, the first interference generated by a transmission from a base station of the macrocell;
measure second interference received at the UE, the second interference generated by a transmission from a second source of interference that is not a device of the macrocell;
generate a first channel state information (CSI) matrix based on a first CSI measurement performed on a first link between the UE and the second source of interference that is not a device of the macrocell;
calculate a receiver weight vector based on the first CSI matrix corresponding to the first link between the UE associated with the macrocell and the second source of interference that is not a device of the macrocell;
generate a second CSI matrix based on a second CSI measurement performed on a second link between the UE and a distributed antenna of the macrocell;
generate a third CSI matrix based on a third CSI measurement performed on a third link between the UE and the base station;
and
send a feedback report to the base station of the macrocell, the feedback report including the receiver weight vector based on the first CSI matrix corresponding to the first link between the UE associated with the macrocell and the second source of interference that is not a device of the macrocell, the second CSI matrix corresponding to the second link between the UE and the distributed antenna of the macrocell, and the third CSI matrix corresponding to the third link between the UE and the base station of the macrocell.

8 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/199,642Filed 6 Mar 2014 · us provisional application
Priority: 6 Mar 2013
Published: US 2014/0256341 A111 Sep 2014
Granted: 26 Dec 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

H04W 72/541
Based on quality criteria: using the level of interference
H04J 11/0023
Orthogonal multiplex systems, e.g. using WALSH codes: interference mitigation or co-ordination
H04B 7/024
Site diversity; Macro-diversity: co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input…
H04B 7/0452
MIMO systems: multi-user MIMO systems