Power balancing in a cooperative communication network
A method of adjusting transmission power for data communicated in a mobile communication system, wherein data is transmitted from a source station to a destination station over a first route and a second route. The method comprises receiving a first transmission power control signal; wherein a destination station generates a second transmission power control signal, in response to receiving a quality measurement signal from the relay station for data communicated to the destination station over a combination of the first route and the second route; and adjusting data transmission power according to the first transmission power control signal.
1. A method of adjusting at least transmission power or a transmission rate at a relay station for data communicated in a mobile communication system, wherein data is transmitted from a source station to a destination station over a first route and a second route, the method comprising:
measuring a Signal to Noise Ratio (SNR) between the source station and relay station (SNR(S-R));
receiving, from the destination station, an SNR between the source station and the destination station (SNR(S-D)) and an SNR between the relay station and destination station (SNR(R-D));
generating an adjustment value of the at least the transmission power or the transmission rate by using the SNR(S-R), the SNR(S-D) and the SNR(R-D); and
transmitting the adjustment value to the source station for adjusting the at least the transmission power or the transmission rate.
2. The method of claim 1 , wherein the first route is characterized by a direct communication route established between the source station and the destination station.
3. The method of claim 1 , wherein the second route is characterized by a communication route established between the source station and the destination station by way of the relay station.
4. The method of claim 1 , wherein:
data is transmitted from the source station to the destination station over the first route in a first time interval;
the same data is transmitted from the source station to the relay station over a first segment of the second route in the first time interval; and
the relay station transmits the same data to the destination station over a second segment of the second route in a second time interval.
5. The method of claim 1 , wherein the first time interval the second time interval are within a single communication frame for data communicated between the source station and the destination station.
6. The method of claim 1 , wherein:
a distance between the source station and the destination station remains the same; and
a distance between the source station and the relay station is decreasing.
7. A method of adjusting data transmission power for a source station in a mobile communication network, the method comprising:
receiving a notification to reduce data transmission power for data transmitted from the source station to a destination station over a first route and a second route,
wherein the notification is in response to detecting an increase in data transmission throughput over a first segment of the second route comprising a communication route established between the source station and a relay station.
8. The method of claim 7 , wherein:
the first route comprises a first communication route directly established between the source station and the destination station; and
the second route comprises a second communication route established between the source station and the destination station by way of the relay station.
9. The method of claim 7 , wherein the notification is generated by the relay station, in response to monitoring quality of transmission over the first segment of the second route.
10. A method of adjusting data transmission power for a source station in a mobile communication network, the method comprising:
receiving a notification to increase data transmission power for data transmitted from the source station to a destination station over a first route and a second route,
wherein the notification is in response to detecting a decrease in data transmission throughput or an increase in traffic volume over a first segment of the second route comprising a communication route established between the source station and a relay station.
11. The method of claim 10 , wherein:
the first route comprises a first communication route directly established between the source station and the destination station; and
the second route comprises a second communication route established between the source station and the destination station by way of the relay station.
12. A method of adjusting data transmission power for a source station in a mobile communication network, the method comprising:
transmitting data to a relay station and a destination station, wherein the relay station transmits the data received from the source station communicating with the destination station over a first route and a second route;
wherein the relay station increases data transmission power for data transmitted from the relay station to the destination station, in response to detecting a decrease in data transmission throughput or an increase in traffic volume for data received from the source station.
13. The method of claim 12 , wherein:
the first route comprises a first communication route directly established between the source station and the destination station; and
the second route comprises a second communication route established between the source station and the destination station by way of the relay station.
14. A method of adjusting data transmission power for a source station in a mobile communication network, the method comprising:
transmitting data to a relay station and a destination station, wherein the relay station transmits the data received from the source station communicating with the destination station over a first route and a second route;
wherein the relay station decreases data transmission power for data transmitted from the relay station to the destination station, in response to detecting an increase in data transmission throughput or a decrease in the traffic volume for data received from the source station.
15. The method of claim 14 , wherein:
the first route comprises a first communication route directly established between the source station and the destination station; and
the second route comprises a second communication route established between the source station and the destination station by way of the relay station.
16. A method for adjusting at least a transmission power or a transmission rate at a source station for data communicated in a mobile communication system, wherein data is transmitted from the source station to a destination station over a first route and a second route, the method comprising:
receiving, from a relay station, an adjustment value of the at least the transmission power or the transmission rate; and
adjusting the at least the transmission power or the transmission rate by using the adjustment value,
wherein the adjustment value is based on a Signal to Noise Ratio (SNR) between the source station and the destination station (SNR(S-D)), an SNR between the relay station and the destination station (SNR(R-D)) and an SNR between the source station and the relay station (SNR(S-R)).