Downlink single-user multi-cell mimo systems for interference mitigation
AssigneeSamsung Electronics Co., Ltd.
InventorsLingjia Liu, Jianzhong Zhang
Life of this patent
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Abstract
A system and method for interference mitigation. The system and method includes a number of base stations configured to coordinate with each other to perform a joint transmission to one or more subscriber stations. The base stations allocate a portion of a frequency band for the joint transmission and jointly schedule the joint transmission. Further, the base stations are configured to select a common codebook or separate codebooks to perform the joint transmission. Thereafter, the joint transmission is performed wherein the one or more subscribers stations substantially simultaneously receive the joint transmission from each of the base stations.
Claims26
For use in a wireless communications network, a subscriber station capable of receiving communications via a preset frequency band from a plurality of cells, the present frequency band being divided into a multi-cell joint frequency band assigned to at least two cells and an individual cell frequency band assigned to each cell, the subscriber station comprising:
- a transmitter configured to feedback identification information on at least two interfering cells and channel related information for the at least two interfering cells;
- a receiver configured to receive at least two coordinated joint transmissions having a single frequency band, that are scheduled by the identified at least two interfering cells for the subscriber station based on the identification information and the channel related information from the at least two interfering cells,
- wherein the single frequency band is allotted from the multi-cell frequency band.
A wireless communications network comprising a plurality of base stations, each one of the base stations capable of wireless communications with a plurality of subscriber stations, at least two of the plurality of base stations comprising:
- a receiver configured to receive identification information on at least two interfering cells and channel related information for the at least two interfering cells from a subscriber station;
- and
- a controller configured to divide a preset frequency band utilized by each cell into a multi-cell joint frequency band and an individual cell frequency band, to allot a single frequency band of the multi-cell joint frequency band for joint transmissions, and to control the identified at least two interfering cells to transmit the joint transmissions using the single frequency band to the subscriber station.
For use in a wireless communications network, a method for interference mitigation, the method comprising:
- receiving identification information on at least two interfering base stations and channel related information for the at least two interfering base stations from a subscriber station;
- dividing a preset frequency band utilized by a plurality of base stations into a multi-cell joint frequency band and an individual cell frequency band;
- coordinating, by a first base station of the identified at least two interfering base stations, a joint transmission to the subscriber station with a second base station of the identified at least two interfering base stations;
- allocating a single frequency band of the multi-cell joint frequency band for the joint transmission;
- transmitting, by the first base station, the joint transmission at a substantially same time and frequency that the joint transmission is transmitted by the second base station to the at least one subscriber station.
Dependencies are inferred from the claim text.