# US 5,708,968 A · Channel segregation method

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- Number: US 5,708,968 A
- Document ID: US5708968A
- Status: Granted
- Kind: A
- Application number: 08/530,194
- Filed: 1995-10-02
- Granted: 1998-01-13
- Earliest claimed: 1994-06-22
- Assignees: Nippon Mobile Communications
- Inventors: Hiroshi Suzuki
- Web page: https://patentgrep.com/patent/US5708968A

## CPC

- H04W 16/04: Traffic adaptive resource partitioning
- H04W 16/10: Dynamic resource partitioning
- H04W 16/12: Fixed resource partitioning
- H04W 16/32: Hierarchical cell structures
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The minimum CIR value that permits a channel allocation to a call is defined as a threshold value .LAMBDA..sub.c1 and a CIR value a little larger than it is defined as a threshold value .LAMBDA..sub.c2. The CIR value in each idle channel is measured. When the measured CIR value is below the threshold value .LAMBDA..sub.c1, the priority of that channel is decreased; when the CIR value is between the threshold values .LAMBDA..sub.c1 and .LAMBDA..sub.c2, the priority is increased; and when the CIR value is above the threshold value .LAMBDA..sub.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 .LAMBDA..sub.c1 is allocated to that call and the priority of the allocated channel is increased.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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 3 (depends on 1)

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 4 (depends on 1, 2)

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, .LAMBDA. and q(.LAMBDA.), respectively, said priority of said each channel is expressed by the following equation:
P(i)={(i-1)P(i)+q(.LAMBDA.)}/i.

### Claim 5 (depends on 1, 2)

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, .LAMBDA. and q(.LAMBDA.), respectively, said priority of said each channel is expressed by the following equation:
P(i)=.lambda.P(i-1)+q(.LAMBDA.)
where .LAMBDA. is a predetermined forgetting coefficient that satisfies a condition 1>.lambda.>0.

### Claim 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.

### Claim 7 (depends on 6)

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 8 (depends on 6)

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 9 (depends on 6, 7)

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 10 (depends on 6, 7)

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)=.lambda.P(i-1)+q(W)
where .lambda. is a predetermined forgetting coefficient that satisfies a condition 1>.lambda.>0.