Apparatus and method for reducing other-cell interference in a broadband wireless communication system
AssigneesSamsung Electronics Co., Ltd., Seoul National University Industry Foundation
InventorsYong-Hwan Lee, Keon-Wook Lee
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Abstract
An apparatus and method for avoiding interference in a broadband wireless communication system using FCS are provided. The apparatus and method include a receiver for monitoring channel statuses of neighbor cells using signals received from the neighbor cells, an active set generator for generating an active set according to at least one of the channel statuses of the neighbor cells, loads of the neighbor cells, and a performance gain from the neighbor cells, and a BS selector for selecting a serving cell from the active set according to the channel statuses of cells included in the active set. Accordingly, interference is reduced and reception performance is improved.
Claims27
A Mobile Station (MS) in a wireless communication system using Fast Cell site Selection (FCS), comprising:
- a receiver for monitoring channel statuses of neighbor cells using signals received from the neighbor cells;
- an active set generator for generating an active set according to at least one of the channel statuses of the neighbor cells, loads of the neighbor cells, and a performance gain from the neighbor cells;
- a Base Station (BS) selector for selecting a serving cell from the active set according to the channel statuses of cells included in the active set;
- and
- a transmitter for transmitting a data request signal including at least one of Channel Quality Information (CQI) of the selected serving cell and a requested frequency band to the serving cell,
- wherein the transmitter transmits to the other cells of the active set except the selected serving cell a signal requesting the other cells not to use a frequency band that is used for communications between the serving cell and the MS.
A Base Station (BS) in a wireless communication system using Fast Cell site Selection (FCS), comprising:
- a receiver for receiving a signal from at least one of a Mobile Station (MS) and a neighbor cell;
- an active set manager for upon receipt of an active set approval request signal from the MS, determining whether to approve the active set approval request according to a load of the BS;
- a scheduler for, upon receipt of a data request signal, scheduling the MS according to a channel status of the MS;
- and
- a transmitter for transmitting to other cells included in the active set except the BS a signal requesting the other cells not to use a frequency band, when the frequency band is allocated to the MS through the scheduling by the scheduler.
A method for configuring an active set in a wireless communication system using Fast Cell site Selection (FCS), the method comprising:
- selecting a cell with the highest average power level from among neighbor cells;
- calculating a performance gain that can be achieved by adding the selected cell to the active set;
- and
- adding the selected cell to the active set if the performance gain is increased.
A method for operating a scheduler for avoiding interference in a wireless communication system using Fast Cell site Selection (FCS), the method comprising:
- evaluating Channel Quality Information (CQIs) of neighbor cells of a Mobile Station (MS) received from the MS;
- performing scheduling for the MS according to the CQIs;
- and
- performing, when a serving cell and a frequency band are selected for the MS through the scheduling, scheduling not to allocate the selected frequency band to the other cells included in an active set except the selected serving cell.
A method for operating a Mobile Station (MS) for avoiding interference in a wireless communication system using Fast Cell site Selection (FCS), the method comprising:
- generating an active set according to at least one of average power levels, loads, and a performance gain of neighbor cells;
- detecting information about a frequency band for communicating with a serving cell from a cell included in the active set;
- selecting a cell having the best channel status of the frequency band from among the cells included in the active set;
- transmitting a data request signal to the selected cell in the frequency band;
- and
- transmitting to unselected cells included in the active set a signal requesting the unselected cells not to use the frequency band.
A method for operating a Base Station (BS) for avoiding interference in a wireless communication system using Fast Cell site Selection (FCS), the method comprising:
- transmitting to a Mobile Station (MS) information about a frequency band to be allocated to the MS, the frequency band being determined by negotiations with neighbor cells included in an active set;
- transmitting data to the MS in the frequency band, upon receipt of a data request signal from the MS;
- and
- determining not to use the frequency band allocated to the MS when the data request signal is not received from the MS.
A method for operating a Base Station (BS) for avoiding interference in a wireless communication system using Fast Cell site Selection (FCS), comprising:
- detecting, upon receipt of a data request signal from a Mobile Station (MS), Channel Quality Information (CQI) and information about a requested frequency band from the data request signal;
- scheduling the MS using the CQI;
- and
- transmitting to other cells included in an active set except the BS a signal requesting the other cells not to use the frequency band, if the requested frequency band is allocated to the MS by the scheduling.
A scheduler for avoiding interference in a wireless communication system using Fast Cell site Selection (FCS), comprising:
- means for evaluating Channel Quality Information (CQIs) of neighbor cells of a Mobile Station (MS) received from the MS;
- means for performing scheduling for the MS according to the CQIs;
- and
- means for performing, when a serving cell and a frequency band are selected for the MS through the scheduling, scheduling not to allocate the selected frequency band to the other cells included in an active set except the selected serving cell.
Dependencies are inferred from the claim text.