Channel segregation method

Claim 2

A channel segregation method which utilizes an autonomous distributed control scheme and allows each base station to assign an idle channel of a predetermined number of channels to a call according to their priorities, said method comprising the steps of: (a) presetting a first threshold value and a second larger threshold value with respect to a carrier power versus interference-wave power ratio CIR, defining a first range of said CIR value smaller than said first threshold value, a second range of said CIR value between said first and second threshold values and a third range of said CIR value larger than said second threshold value, and predetermining an increasing/decreasing function which takes at least a first value in said first CIR range and at least a second value opposite in polarity to said first value in said second CIR range; (b) measuring said CIR value for each channel at every predetermining timing; (c) when said CIR value is within said first CIR range, decreasing the priority of said channel by at least the value of said increasing/decreasing function corresponding to said first value; (d) when said measured CIR value is within said second CIR range, increasing the priority of said channel by at least the value of said increasing/decreasing function corresponding to said second value; (e) when said measured CIR value is within said third CIR range, maintaining the previous priority of said channel unchanged; and (f) when said idle channel is assigned to said call on the basis of the priority of said each channel, increasing the priority of said assigned channel.

Claim 3

The channel segregation method of claim 1 wherein: a third threshold value is predetermined intermediate between said first and second threshold values; said second range includes a fourth range defined between said first and third threshold values and a fifth range defined between said third and second threshold values; said increasing/decreasing function takes said second value in said fourth range and, in said fifth range, at least a third value smaller in absolute value than said second value and common thereto in polarity; and said step (d) is a step of increasing the priority of said channel by the value corresponding to said second or third value of said increasing/decreasing function, depending on whether said measured CIR value is within said fourth or fifth range.

Claim 4

The channel segregation method of claim 1 wherein: a third threshold value smaller than said first threshold value is predetermined in said first range; said first range includes a fourth range below said third threshold value and a fifth range defined between said third and first threshold values; said increasing/decreasing function takes said second value in said fourth range and, in said fifth range, a third value smaller in absolute value than said second value and common thereto in polarity; and said step (c) is a step of decreasing the priority of said channel by the value corresponding to said second or third value of said increasing/decreasing function, depending on whether said measured CIR value is within said fourth or fifth range.

Claim 5

The channel segregation method of claim 1, 2, or 3 wherein, letting the current timing, said measured CIR value and said increasing/decreasing function be represented by i, Λ and q(Λ), respectively, said priority of said each channel is expressed by the following equation: P(i)={(i-1)P(i)+q(Λ)}/i.

Claim 6

The channel segregation method of claim 1, 2, or 3 wherein, letting the current timing, said measured CIR value and said increasing/decreasing function be represented by i, Λ and q(Λ), respectively, said priority of said each channel is expressed by the following equation: P(i)=λP(i-1)+q(Λ) where Λ is a predetermined forgetting coefficient that satisfies a condition 1>λ>0.

Claim 7

A channel segregation method which utilizes an autonomous distributed control scheme and allows each base station to assign an idle channel of a predetermined number of channels to a call according to their priorities, said method comprising the steps of: (a) presetting a first threshold value and a second smaller threshold value with respect to interference-wave received power, defining a first range of said interference-wave received power larger than said first threshold value, a second range of said interference-wave received power between said first and second threshold value and a third range of said interference-wave received power smaller than said second threshold value, and predetermining an increasing/decreasing function that takes at least a first value in said first range and at least a second value opposite in polarity to said first value in said second range; (b) measuring said interference-wave received power for each channel at every predetermined timing; (c) when said measured interference-wave received power is within said first range, decreasing the priority of said channel by at least the value of said increasing/increasing function corresponding to said first value; (d) when said measured interference-wave received power is within said second range, increasing the priority of said channel by at least the value of said increasing/decreasing function corresponding to said second value; (e) when said measured interference-wave received power is within said third range, maintaining the previous priority of said channel unchanged; and (f) when said idle channel is assigned to said call on the basis of said priority of said each channel, increasing the priority of said assigned channel.

Claim 8

A channel segregation method which utilizes an autonomous distributed control scheme and allows each base station to assign an idle channel of a predetermined number of channels to a call according to their priorities, said method comprising the steps of: (a) presetting a first threshold value and a second smaller threshold value with respect to interference-wave received power, defining a first range of said interference-wave received power larger than said first threshold value, a second range of said interference-wave received power between said first and second threshold value and a third range of said interference-wave received power smaller than said second threshold value, and predetermining an increasing/decreasing function that takes at least a first value in said first range and at least a second value opposite in polarity to said first value in said second range; (b) measuring said interference-wave received power for each channel at every predetermined timing; (c) when said measured interference-wave received power is within said first range, decreasing the priority of said channel by at least the value of said increasing/increasing function corresponding to said first value; (d) when said measured interference-wave received power is within said second range, increasing the priority of said channel by at least the value of said increasing/decreasing function corresponding to said second value; (e) when said measured interference-wave received power is within said third range, maintaining the previous priority of said channel unchanged; and (f) when said idle channel is assigned to said call on the basis of said priority of said each channel, increasing the priority of said assigned channel.

Claim 9

The channel segregation method of claim 6 wherein: a third threshold value is predetermined intermediate between said first and second threshold values; said second range includes a fourth range defined between said first and third threshold values and a fifth range defined between said third and second threshold values; and said increasing/decreasing function takes said second value in said fourth range and, in said fifth range, at least a third value smaller in absolute value than said second value and common thereto in polarity; and said step (d) is a step of increasing the priority of said channel by the value corresponding to said second or third value of said increasing/decreasing function, depending on whether said measured interference-wave received power is within said fourth or fifth range.

Claim 10

The channel segregation method of claim 6 wherein: a third threshold value larger than said first threshold value is predetermined in said first range; said first range includes a fourth range above said third threshold value and a fifth range defined between said third and first threshold values; said increasing/decreasing function takes said second value in said fourth range and, in said fifth range, a third value smaller in absolute value than said second value and common thereto in polarity; and said step (c) is a step of decreasing the priority of said channel by the value corresponding to said second or third value of said increasing/decreasing function, depending on whether said measured interference-wave received power is within said fourth or fifth range.

Claim 11

The channel segregation method of claim 6, 7, or 8 wherein, letting the current timing, said measured interference-wave received power and said increasing/decreasing function be represented by i, W and q(W), respectively, said priority of said each channel is expressed by the following equation: P(i)={(i-1)P(i)+q(W)}/i.

Claim 12

The channel segregation method of claim 6, 7, or 8 wherein, letting the current timing, said measured interference-wave received power and said increasing/decreasing function be represented by i, W and q(W), respectively, said priority of said each channel is expressed by the following equation: P(i)=λP(i-1)+q(W) where λ is a predetermined forgetting coefficient that satisfies a condition 1>λ>0.