Channel segregation method

• US 5,708,968 A
• Filed: 10/02/1995
• Issued: 01/13/1998
• Est. Priority Date: 06/22/1994
• Status: Expired due to Fees

• Current Assignee: NTT Mobile Communications Network Inc. (Nippon Telegraph and Telephone Corporation)
• Original Assignee: Korea Mobile Communications Incorporated
• Inventors: Suzuki, Hiroshi
• Primary Examiner(s): Eisenzopf, Reinhard J.
• Assistant Examiner(s): ARTHUR JEANGLAUDE, GERTRUDE
• Application Number:
  US08/530,194
• Time in Patent Office: 834 Days
• Field of Search: 455/34.1, 455/33.1, 455/34.2, 455/54.1, 455/54.2, 455/56.1, 455/62, 455/63, 455/67.1
• US Class Current: 455/464
• CPC Class Codes: H04W 16/04 Traffic adaptive resource partitioning
• CPC Class Codes: H04W 16/10 Dynamic resource partitioning
• CPC Class Codes: H04W 16/12 Fixed resource partitioning
• CPC Class Codes: H04W 16/32 Hierarchical cell structures

Abstract

The minimum CIR value that permits a channel allocation to a call is defined as a threshold value Λ_c1 and a CIR value a little larger than it is defined as a threshold value Λ_c2. The CIR value in each idle channel is measured. When the measured CIR value is below the threshold value Λ_c1, the priority of that channel is decreased; when the CIR value is between the threshold values Λ_c1 and Λ_c2, the priority is increased; and when the CIR value is above the threshold value Λ_c2, the priority is held unchanged. When a call occurs in a base station, the highest-priority one of idle channels with the CIR values larger than the threshold value Λ_c1 is allocated to that call and the priority of the allocated channel is increased.

Claims

1. 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.

2. 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.

3. 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.

4. 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;

space="preserve" listing-type="equation">P(i)={(i-1)P(i)+q(Λ

)}/i.

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;

space="preserve" listing-type="equation">P(i)=λ

P(i-1)+q(Λ

)

where Λ

is a predetermined forgetting coefficient that satisfies a condition 1>

λ

>

0.

6. 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.

7. 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.

8. 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.

9. 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:

space="preserve" listing-type="equation">P(i)={(i-1)P(i)+q(W)}/i.

10. 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:

space="preserve" listing-type="equation">P(i)=λ

P(i-1)+q(W)

where λ

is a predetermined forgetting coefficient that satisfies a condition 1>

λ

>

0.