Interference Indicator Table for Cell-Edge Mobile Stations
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Solution Overview
Problem
Current interference coordination methods in mobile communication systems face issues such as reduced frequency diversity, deteriorated capacity due to frequency band division, indiscriminate reduction in transmission power across cells, and increased power consumption in mobile stations due to frequent interference measurements.
Innovation Solution
A base station apparatus divides the uplink channel frequency band into predetermined bands and creates an interference information indicator table showing the relative interference magnitude in each band, allowing mobile stations to perform data transmission based on this allocation, thereby selecting frequency bands with low interference for improved throughput and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If frequency band division is implemented for interference coordination, then inter-cell interference is suppressed, but frequency diversity is reduced and system capacity deteriorates
Solution Approach 1:
The patent applies local quality by creating distinct interference coordination schemes for different mobile station types: cell-edge mobile stations use one interference suppression method while cell-center mobile stations use another method. This allows each group to benefit from optimized interference coordination without forcing frequency band division on all users, thereby maintaining system capacity while suppressing interference for vulnerable cell-edge users.
Solution Approach 2:
The patent segments the mobile station population into two distinct groups (cell-edge and cell-center) based on their interference characteristics and requirements. By segmenting users rather than frequency bands, the system can apply differentiated interference coordination strategies that preserve overall system capacity while providing targeted interference suppression where needed.
2Object-affected harmful factors
If transmission power is reduced to suppress inter-cell interference, then interference coordination is achieved, but throughput is reduced in frequency bands with low interference
Solution Approach 1:
The patent changes the parameter being controlled from uniform transmission power reduction to selective frequency band allocation. Instead of reducing power across all frequency bands, the system dynamically allocates specific frequency bands to cell-edge mobile stations based on interference conditions, allowing transmission power to be maintained in bands with low interference while avoiding bands with high interference.
Solution Approach 2:
The patent implements feedback mechanisms where the base station receives interference measurements from mobile stations and adjusts frequency band allocation accordingly. This feedback loop allows the system to identify which frequency bands have low interference and allocate those bands to cell-edge users, thereby maintaining high throughput while achieving interference coordination.
3Object-affected harmful factors
If mobile stations frequently measure interference to coordinate transmission, then interference coordination is improved, but power consumption increases
Solution Approach 1:
The patent extracts the interference measurement and coordination function from the mobile station and relocates it to the base station. The base station performs the computationally intensive interference analysis and frequency band allocation, while mobile stations only need to provide basic measurements and receive allocation instructions. This extraction significantly reduces the processing burden and power consumption at the mobile station while maintaining effective interference coordination.
Solution Approach 2:
The patent introduces the base station as an intermediary that mediates between interference measurement and coordination decisions. Rather than mobile stations directly performing complex interference coordination calculations, the base station acts as an intermediary that receives measurements, processes interference information, and generates allocation decisions, thereby reducing mobile station power consumption.
Data Source
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AI summary
To improve throughput of the whole system while reducing power consumption. In a mobile communication system comprising a mobile station apparatus and a base station apparatus, the base station apparatus creates an interference information table based on channel quality of an uplink channel, and at the same time, transmitting the interference information indicator table to the mobile station apparatus, and the mobile station apparatus determines a state of interference in an uplink frequency band based on the interference information indicator table, determines a frequency band of a measurement pilot channel, which is a pilot channel used to determine received quality, and make a request to the base station apparatus for a transmission resource. For example, the mobile station apparatus determines a frequency band with lowest interference among the uplink frequency bands as a frequency band of the measurement pilot channel.