Method for inter-cell interference mitigation for a mobile communication system
View Patent ↗A method for reducing inter-cell interference (ICI) in a mobile communication system controls transmission signal power of an uplink signal from a terminal based on signal power measurement for a signal received from a base station of a neighboring cell. A terminal receives a signal from a base station of a neighboring cell via a wireless channel, measures a channel response against a threshold value across an applicable frequency band by using the received signal, determines a transmission signal power for each frequency band used for data transmission based on the measured channel response, and transmits data to a home cell base station according to the transmission signal power for each frequency band. The terminal may measure a channel response based on signals received from multiple base stations in multiple neighboring cells, and may also evaluate signal power of a signal transmitted from the home cell.
1. A method for managing uplink channel resources in a mobile communication terminal located in a first cell, comprising:
measuring, at the mobile communication terminal, channel responses of a downlink channel signal for each downlink frequency band of a plurality of frequency bands, the downlink channel signal transmitted from a base station of a second cell;
dividing the plurality of frequency bands into a first frequency band and a second frequency band; and
determining, by the mobile communication terminal, a transmission signal power of an uplink channel signal for each uplink frequency band of the plurality of frequency bands based on the channel responses,
wherein the first frequency band corresponds to a first downlink frequency band for receiving the downlink channel signal and corresponds to a first uplink frequency band for transmitting the uplink channel signal,
the second frequency band corresponds to a second downlink frequency band for receiving the downlink channel signal and corresponds to a second uplink frequency band for transmitting the uplink channel signal, and
the transmission signal power for the first uplink frequency band is selected to be lower than the transmission signal power for the second uplink frequency band, based on determining, by the mobile communication terminal, that the channel response of the downlink channel signal for the first downlink frequency band is better than the channel response of the downlink channel signal for the second downlink frequency band.
2. A method for transmitting data in a mobile communication system, comprising:
receiving, at a mobile communication terminal, a pilot signal from a first base station via a wireless channel;
measuring, by the mobile communication terminal, channel responses of the wireless channel for each downlink frequency band of a plurality of frequency bands by using the pilot signal;
dividing the plurality of frequency bands into first frequency bands and second frequency bands;
determining, by the mobile communication terminal, a transmission signal power for each uplink frequency band of the plurality of frequency bands used for a data transmission based on the channel responses; and
transmitting, from the mobile communication terminal, data to a second base station based on the transmission signal power for each frequency band,
wherein the first frequency bands correspond to first downlink frequency bands for receiving the pilot signal and correspond to first uplink frequency bands for the data transmission,
the second frequency bands correspond to second downlink frequency bands for receiving the pilot signal and correspond to second uplink frequency bands for the data transmission, and
the transmission signal power for the first uplink frequency bands is selected to be lower than the transmission signal power for the second uplink frequency bands, based on determining, by the mobile communication terminal, that the channel response for the first downlink frequency bands is better than the channel response for the second downlink frequency bands.
3. A method for managing uplink channel resources in a mobile communication terminal, comprising:
measuring, by the mobile communication terminal, channel responses of a downlink channel signal for each downlink frequency band of a plurality of frequency bands;
dividing the plurality of frequency bands into a first frequency band and a second frequency band; and
determining, by the mobile communication terminal, a transmission signal power of an uplink channel signal for each uplink frequency band of the plurality of frequency bands based on the channel responses,
wherein the first frequency band corresponds to a first downlink frequency band for receiving the downlink channel signal and corresponds to a first uplink frequency band for transmitting the uplink channel signal,
the second frequency band corresponds to a second downlink frequency band for receiving the downlink channel signal and corresponds to a second uplink frequency band for transmitting the uplink channel signal, and
the transmission signal power for the first uplink frequency band is selected to be lower than the transmission signal power for the second uplink frequency band, based on determining, by the mobile communication terminal, that the channel response of the downlink channel signal for the first downlink frequency band is better than the channel response of the downlink channel signal for the second downlink frequency band.
4. A method for transmitting data in a mobile communication system, comprising:
receiving, at a mobile communication terminal, a pilot signal from a base station via a wireless channel;
measuring, by the mobile communication terminal, channel responses of the wireless channel for each downlink frequency band of a plurality of frequency bands by using the pilot signal;
dividing the plurality of frequency bands into first frequency bands and second frequency bands;
determining, by the mobile communication terminal, a transmission signal power for each uplink frequency band of the plurality of frequency bands used for a data transmission based on the channel responses; and
transmitting, from the mobile communication terminal, data to a base station based on the transmission signal power for each frequency band,
wherein the first frequency bands correspond to first downlink frequency bands for receiving the pilot signal and correspond to first uplink frequency bands for the data transmission,
the second frequency bands correspond to second downlink frequency bands for receiving the pilot signal and correspond to second uplink frequency bands for the data transmission, and
the transmission signal power for the first uplink frequency bands is selected to be lower than the transmission signal power for the second uplink frequency bands, based on determining, by the mobile communication terminal, that the channel response for the first downlink frequency bands is better than the channel response for the second downlink frequency bands.
5. The method of claim 1 , wherein the channel responses comprises at least one of a signal-to-interference plus noise ratio (SINR), a signal gain measured for each downlink frequency band of the downlink channel signal, and a signal power measured for each downlink frequency band of the downlink channel signal.
6. The method of claim 3 , wherein the channel responses comprises at least one of a signal-to-interference plus noise ratio (SINR), a signal gain measured for each downlink frequency band of the downlink channel signal, and a signal power measured for each downlink frequency band of the downlink channel signal.
7. The method of claim 2 , wherein the channel responses comprises at least one of a signal-to-interference plus noise ratio (SINR), a signal gain measured for each downlink frequency band of the pilot signal, and a signal power measured for each downlink frequency band of the pilot signal.
8. The method of claim 4 , wherein the channel responses comprises at least one of a signal-to-interference plus noise ratio (SINR), a signal gain measured for each downlink frequency band of the pilot signal, and a signal power measured for each downlink frequency band of the pilot signal.
9. The method of claim 1 , wherein determining the transmission signal power comprises:
dividing the plurality of frequency bands into first frequency bands with a good channel response and second frequency bands with a poor channel response; and
selecting a transmission signal power of the first frequency bands that is less than a transmission signal power of the second frequency bands.
10. The method of claim 2 , wherein determining the transmission signal power comprises:
dividing the plurality of frequency bands into first frequency bands with a good channel response and second frequency bands with a poor channel response; and
selecting a transmission signal power of the first frequency bands that is less than a transmission signal power of the second frequency bands.
11. The method of claim 3 , wherein determining the transmission signal power comprises:
dividing the plurality of frequency bands into first frequency bands with a good channel response and second frequency bands with a poor channel response; and
selecting a transmission signal power of the first frequency bands that is less than a transmission signal power of the second frequency bands.
12. The method of claim 4 , wherein determining the transmission signal power comprises:
dividing the plurality of frequency bands into first frequency bands with a good channel response and second frequency bands with a poor channel response; and
selecting a transmission signal power of the first frequency bands that is less than a transmission signal power of the second frequency bands.
13. The method of claim 2 , further comprising:
receiving a plurality of pilot signals from a plurality of base stations respectively arranged in a plurality of cells, and
wherein the channel responses are further measured with respect to the plurality of pilot signals.
14. The method of claim 4 , further comprising:
receiving a plurality of pilot signals from a plurality of base stations respectively arranged in a plurality of cells, and
wherein the channel responses are further measured with respect to the plurality of pilot signals.
15. The method of claim 1 , further comprising:
measuring a plurality of channel responses from a plurality of base stations respectively arranged in a plurality of cells, and
wherein the transmission signal power is determined with respect to the plurality of channel responses.
16. The method of claim 3 , further comprising:
measuring a plurality of channel responses from a plurality of base stations respectively arranged in a plurality of cells, and
wherein the transmission signal power is determined with respect to the plurality of channel responses.