Device and method of enhancing downlink ue-specific demodulation reference signal to facilitate inter-cell interference cancellation and suppression
AssigneeFuturewei Technologies, Inc.
InventorsQian Cheng, Weimin Xiao, Jialing Liu
Life of this patent
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Abstract
Various devices and methods are provided that use enhanced downlink demodulation reference signals (DMRS) to facilitate inter-cell interference cancellation and suppression. Coordinated configuration of DMRS port assignments for transmission from cells in a group of neighboring cells is provided. Each cell's physical cell identification (PCID) is mapped with its corresponding assigned antenna port(s).
Claims20
A method for cancelling interference received at a user equipment (UE), the method comprising:
- receiving a first signal from a serving base station transmitted on a first antenna port, the first signal comprising a first demodulation reference signal (DRMS);
- receiving an interfering signal from a neighboring base station transmitted on a second antenna port, the interfering signal comprising a second DMRS coded orthogonally different from the first signal;
- determining a cell identification of the neighboring base station;
- identifying the second antenna port in accordance with a predefined mapping between a plurality of cell identifications and antenna ports;
- recovering DMRS information of the interfering signal from the second DMRS using the identified second antenna port;
- and
- performing interference cancellation on the first signal and the second signal using the recovered DMRS information of the interfering signal.
A method for interference cancellation at a user equipment (UE), the method comprising:
- obtaining information mapping each physical cell identification (PCID) of each base station in a group of neighboring base stations with one or more antenna ports assigned to the respective base station;
- receiving a desired signal from a serving base station;
- receiving an interfering signal from a neighboring base station;
- identifying a PCID of the neighboring base station;
- determining from the identified PCID the one or more antenna ports associated with the neighboring base station;
- based at least in part on the determined one or more antenna ports, recovering demodulation reference signal (DMRS) information carried in the interfering signal;
- and
- performing interference cancellation on the desired signal and the interfering signal using the recovered DMRS information of the interfering signal.
A method for facilitating inter-cell interference in a wireless communications network, the method comprising:
- assigning a set of antenna ports to each of a first base station and a plurality of coordinating neighboring base stations for transmission of user equipment-specific reference signals (UE-RS) according to the assigned antenna ports, each assigned antenna port different from each other;
- assigning a common DMRS scrambling identity to the first base station and the plurality of coordinating neighboring base stations;
- generating an association between the respective assigned set of antenna ports and the first base station and plurality of coordinating neighboring base stations;
- and
- transmitting the association and the common scrambling identity to at least one UE within the coordinating base stations for use in an inter-cell interference process.
A method for facilitating inter-cell interference in a wireless communications network, the method comprising:
- assigning, according to a default association, a set of ports to each of a first base station and a plurality of coordinating neighboring base stations for transmission of user equipment-specific reference signals (UE-RS) according to the assigned antenna ports, each assigned antenna port different from each other;
- transmitting the UE-RS according to the assigned set of ports from the first base station to at least one user equipment (UE) located within a region served by the first base station;
- and
- transmitting the UE-RS according to the assigned port from at least one of the plurality of neighboring base stations.
Dependencies are inferred from the claim text.