Method for deciding transmission priority of non-realtime data and apparatus and method for controlling interference between cells using the same
There is provided a method for deciding a transmission priority of non-realtime data, the method including: receiving a user requested data transfer rate; confirming an average data transfer rate allocated previously to a user terminal; and deciding a transmission priority using the received user requested data transfer rate and the previously allocated average data transfer rate.
1. An apparatus for controlling inter-cell interference using a transmission priority of a non-realtime data, the apparatus comprising:
a priority calculator for calculating uplink priorities of terminals in a cell using a user requested data transfer rate of each cell;
a condition determiner coupled to an output of the priority calculator, the condition determiner determining whether a number of terminals provided with an uplink service based on uplink priority calculated by the priority calculator is larger than a predetermined threshold or not;
a resource utilization calculator coupled to an output of the condition determiner, the resource utilization calculator calculating resource utilization of each cell;
a cell selector coupled to an output of the resource utilization calculator, the cell selector selecting a cell that generates largest inter-cell interference using the calculated resource utilization of each cell, which is calculated by the resource utilization calculator; and
a cell controller coupled to an output of the cell selector, the cell controller sustaining an uplink service within a threshold range according to a determination result output by the condition determiner and interrupting an uplink service of the cell selected by the cell selector,
wherein when interrupting the uplink service of the selected cell, the cell controller compares performance increment of the selected cell with performance increment of remaining cells and closes the selected cell if it is determined that gain is generated based on a result of comparing the performance increments.
2. The apparatus of claim 1 , wherein the condition determiner uses a limitation value of an interference ratio for thermal noise to determine whether a number of terminals provided with an uplink service according to the calculated uplink priority is larger than a predetermined threshold.
3. The apparatus of claim 2 , wherein the resource utilization calculator uses an interference ratio for thermal noise in a corresponding cell and a limitation value of an interference rate for thermal noise to calculate the resource utilization.
4. A method for controlling inter-cell interference in a code division multiple access (CDMA) system comprising a priority calculator, a condition determiner, a resource utilization calculator, a cell selector, and a cell controller, the method comprising:
calculating uplink priorities of terminals in a cell using the priority calculator, wherein the uplink priorities are calculated based on a user requested data transfer rate of each cell;
determining using the condition determiner whether a number of terminals provided with an uplink service based on uplink priority calculated by the priority calculator is larger than a predetermined threshold or not;
calculating using the resource utilization calculator resource utilization of each cell based on an interference ratio for thermal noise in a corresponding cell and a limitation value of an interference rate for thermal noise;
selecting a cell that generates largest inter-cell interference using the cell selector based on resource utilization of each cell calculated by the resource utilization calculator; and
sustaining using the cell controller an uplink service within a threshold range according to a determination result output by the condition determiner and interrupting using the cell controller an uplink service of the cell selected by the cell selector,
wherein when interrupting the uplink service of the selected cell, comparing using the cell controller a performance increment of the selected cell with a performance increment of remaining cells, and closing the selected cell if it is determined that gain is generated based on a result of comparing the performance increments.
5. The method of claim 4 , wherein the resource utilization calculating uses an interference ratio for thermal noise in a corresponding cell and a limitation value of an interference rate for thermal noise to calculate the resource utilization.