Method for monitoring the state of interference by a base station of a mobile radio communication system

Claim 1

A method for monitoring the state of interference in each zone of a mobile radio communication system wherein a mobile station in each zone performs communication via a base station of said each zone, said method comprising the steps of: (a) periodically measuring, by said mobile station, the field intensity and quality of a downlink radio wave from said base station; (b) reporting measured results from said mobile station to said base station; (c) collecting, by said base station for a predetermined period of time, said measured results reported from said mobile station and statistically processing said collected measured results into data about the state of interference by comparing said measured results with a predetermined reference characteristic to judge whether said measured results are abnormal or not, said reference characteristic being a characteristic predetermined on the basis of a characteristic representing an ideal relationship between field intensity and bit error rate; and (d) evaluating said data about said state of interference, thereby judging the state of interference between the radio wave from said base station and other radio waves of the same frequency as that of said radio wave from said base station, it being judged whether said measured results are abnormal by comparing said measured results with said bit error rate defined by said reference characteristic, the ratio of the number of measured results judged as abnormal to the number of measured results collected for said predetermined period of time being used as an index indicating said state of interference.

Claim 2

A method for monitoring the state of interference in each zone of a mobile radio communication system wherein a mobile station in each zone performs communication via a base station of said each zone, said method comprising the steps of: (a) periodically measuring, by said mobile station, the field intensity and quality of a downlink radio wave from said base station; (b) reporting measured results from said mobile station to said base station; (c) collecting, by said base station for a predetermined period of time, said measured results reported from said mobile station and statistically processing said collected measured results into data about the state of interference by comparing said measured results with a predetermined reference characteristic to judge whether said measured results are abnormal or not, said reference characteristic being a characteristic predetermined on the basis of a characteristic representing an ideal relationship between field intensity and bit error rate; and (d) evaluating said data about said state of interference, thereby judging the state of interference between the radio wave from said base station and other radio waves of the same frequency as that of said radio wave from said base station, it being judged whether said measured results are abnormal by comparing said measured results with said bit error rate defined by said reference characteristic, the ratio of the number of measured results judged as abnormal to the number of measured results collected for said predetermined period of time being used as an index indicating said state of interference.

Claim 6

A method for monitoring the state of interference in each zone of a mobile radio communication system wherein a mobile station in each zone performs communication via a base station of said each zone, said method comprising the steps of: (a) periodically measuring, by said mobile station, the field intensity and quality of a downlink radio wave from said base station; (b) reporting measured results from said mobile station to said base station; (c) collecting, by said base station for a predetermined period of time, said measured results reported from said mobile station and statistically processing said collected measured results into data about the state of interference by comparing said measured results with a predetermined reference characteristic to judge whether said measured results are abnormal or not, said reference characteristic being defined by error rate threshold values determined on the basis of an ideal characteristic indicating an ideal relationship between field intensity and bit error rate in respective intensity regions obtained by dividing field intensity; and (d) evaluating said data about said state of interference, thereby judging the state of interference between the radio wave from said base station and other radio waves of the same frequency as that of said radio wave from said base station, by deciding the intensity region to which said measured results belong, comparing said measured results with said threshold value of said intensity region to determine whether said measured results are abnormal or not, calculating the ratio of the number of measured results determined to be abnormal to the number of measured results belonging to each of said intensity regions during said predetermined period of time, weighting said ratios with predetermined weighting factors, respectively, and summing said weighted ratios to obtain an index indicating said state of interference.

Claim 7

A method for monitoring the state of interference in each zone of a mobile radio communication system wherein a mobile station in each zone performs communication via a base station of said each zone, said method comprising the steps of: (a) periodically measuring, by said mobile station, the field intensity and quality of a downlink radio wave from said base station; (b) reporting measured results from said mobile station to said base station; (c) collecting, by said base station for a predetermined period of time, said measured results reported from said mobile station and statistically processing said collected measured results into data about the state of interference by comparing said measured results with a predetermined reference characteristic to judge whether said measured results are abnormal or not, said reference characteristic being defined by error rate threshold values determined on the basis of an ideal characteristic indicating an ideal relationship between field intensity and bit error rate in respective intensity regions obtained by dividing field intensity; and (d) evaluating said data about said state of interference, thereby judging the state of interference between the radio wave from said base station and other radio waves of the same frequency as that of said radio wave from said base station, by deciding the intensity region to which said measured results belong, comparing said measured results with said threshold value of said intensity region to determine whether said measured results are abnormal or not, calculating the ratio of the number of measured results determined to be abnormal to the number of measured results belonging to each of said intensity regions during said predetermined period of time, weighting said ratios with predetermined weighting factors, respectively, and summing said weighted ratios to obtain an index indicating said state of interference.