Multi-Carrier Subcarrier Allocation for Interference Mitigation
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Solution Overview
Problem
In cellular systems, when a high traffic base station allocates subcarriers to a new mobile station, the frequency of these subcarriers may coincide with existing subcarriers from another base station, leading to interference and reduced throughput for mobile stations.
Innovation Solution
A multicarrier communication apparatus that acquires and compares reception quality values of allocated and allocatable subcarriers across different base stations, selecting subcarriers with different frequencies to deallocate and reallocate, preventing interference and maintaining throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high traffic base station deallocates subcarriers to a new mobile station, then the new mobile station can be accommodated, but the reception quality of the mobile station may deteriorate due to frequency coincidence with subcarriers from other base stations
Solution Approach 1:
The system performs preliminary checks before deallocating subcarriers. The reception quality measurement section measures the reception quality of subcarriers to be deallocated and subcarriers to be allocated, and the deallocation determination section determines whether to proceed with deallocation based on these measurements, preventing frequency coincidence that would cause interference
Solution Approach 2:
The system implements feedback mechanisms where the reception quality measurement section continuously monitors the reception quality of subcarriers, and this information is fed back to the deallocation determination section to make informed decisions about subcarrier reallocation, ensuring that throughput deterioration is prevented
Data Source
AI summary
There is provided a multi-carrier communication method capable of preventing lowering of a throughput of another mobile device accompanying allocation of a sub-carrier for a new mobile station device. This multi-carrier communication method can acquire reception quality information for one of the sub-carriers already allocated in an MS (150a) from a BS (100a) and for one of the sub-carriers which can be allocated in the MS (150a) from the BS (100b). According to the reception quality information, a release sub-carrier is selected from the sub-carriers already allocated and a new-allocation sub-carrier is selected from the sub-carriers which can be allocated. The new-allocation sub-carrier has a frequency different from the already-allocated sub-carriers excluding the release sub-carrier. The BS (100a) is instructed to release the selected release sub-carrier and the BS (100b) is instructed to allocate the selected new-allocation sub-carrier in the MS (150a).