Systems and methods for making channel assignments to reduce interference and increase capacity of wireless networks
First Claim
1. A method for assigning channels in a wireless system, said method comprising:
- determining at a given point in time in interfering cells which mobile stations (MSs) in each said cell are communicating with the highest signal strength; and
assigning channels to said MSs based on said determined signal strength;
wherein said assigning comprises;
in one of said cells making the channel assignment such that a MS with a highest signal strength is assigned a particular channel and in the interfering cell the assignment is that a MS with a lowest signal strength is assigned said particular channel.
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Abstract
There is disclosed a system and method for improving wireless system capacity by reducing collisions where the Signal to Interference Ratio (SIR) is high in systems having a channel reuse of 1. By ordering the channel assignment in each of the interfering cells according to a pattern, for example, according to the distance from a base station (determined by power levels), the mobile stations will become paired on the same channel in a manner to reduce interference between them. In one embodiment, this intelligent assignment is accomplished by assigning mobile stations in one cell such that the mobile station having the strongest signal is assigned channel A while in the interfering cell the mobile station with the weakest signal is assigned to channel A. In another embodiment, certain preferred mobile stations are assigned either interference-free channels or channels paired with weak interference mobile stations.
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Citations
17 Claims
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1. A method for assigning channels in a wireless system, said method comprising:
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determining at a given point in time in interfering cells which mobile stations (MSs) in each said cell are communicating with the highest signal strength; and assigning channels to said MSs based on said determined signal strength; wherein said assigning comprises; in one of said cells making the channel assignment such that a MS with a highest signal strength is assigned a particular channel and in the interfering cell the assignment is that a MS with a lowest signal strength is assigned said particular channel.
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2. A method for assigning channels in a wireless system, said method comprising:
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determining at a given point in time in interfering cells which mobile stations (MSs) in each said cell are communicating with the highest signal strength; and assigning channels to said MSs based on said determined signal strength; in one of said cells making the channel assignment such that preferred MSs are assigned to certain channels and in the interfering cell said certain channels are reserved. - View Dependent Claims (3, 4, 5, 6)
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7. A method of assigning channels to MSs, said method comprising:
in a pair of potentially interfering cells, establishing an assignment order of channels such that with respect to an ordered series of channels in each cell a first cell will assign MSs to channels according to a particular assignment pattern while in the second of said cells the assignment will be in the mirror image of the assignment in said first cell, wherein said particular pattern is in the order of strongest to weakest signal strength with respect to said first cell and said channel assignment is in the order of weakest to strongest with respect to the same ordered series of channels in said second cell. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A wireless system comprising:
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at least two BSs each defining a cell, said BSs using an N=1 repeat pattern; means for determining relative signal strength among MSs communicating with each said BS; and means for assigning MSs according to a pattern designed to minimize interference between MSs in each of said cells using the same channels; and means for assigning an order to said channels in each said cell such that in one cell the weakest signal strength MSs are assigned from one end of said channel order and the strongest signal strength MSs are assigned from the other end of said channel order. - View Dependent Claims (16, 17)
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Specification