Method for congestion avoidance in 4G networks
First Claim
1. A method for congestion avoidance in 4G networks, comprising:
- a) congestion detection, wherein congestion detection comprises;
measuring parameters of uplink air interface utilization, downlink air interface utilization, relative committed uplink rate and relative committed downlink rate; and
using pairs of thresholds (hysteresis) to decide whether congestion has occurred; and
b) congestion avoidance procedure.
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Accused Products
Abstract
This invention aims to avoid and resolve congestions in wireless 4G networks. The method is based on a central self-organizing network (SON) server, which dynamically changes neighbor lists on congested base station and on all base stations in vicinity. The procedure is triggered by measuring relative committed traffic rate and air interface utilization of the base station. When base station enters into congested state, it notifies the SON server. The SON server creates new neighbor lists for all base stations in the vicinity and removes the congested base station from these lists. With new neighbor lists propagated to mobile stations, the latter won'"'"'t scan and initiate handovers to the congested base station. The SON server additionally creates a new dense neighbor list and changes handover triggers settings of the congested base station. The mobile stations consequently find other handover opportunities and connect to different base stations. As the air interface resources are released, the base station leaves the congested state.
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Citations
14 Claims
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1. A method for congestion avoidance in 4G networks, comprising:
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a) congestion detection, wherein congestion detection comprises; measuring parameters of uplink air interface utilization, downlink air interface utilization, relative committed uplink rate and relative committed downlink rate; and using pairs of thresholds (hysteresis) to decide whether congestion has occurred; and b) congestion avoidance procedure. - View Dependent Claims (2, 3, 4)
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5. A system for congestion avoidance in 4G networks, comprising:
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a processor; and a memory coupled with the processor, wherein the memory is configured to provide the processor with instructions which when executed cause the processor to; detect congestion, wherein detecting congestion comprises; measuring parameters of uplink air interface utilization, downlink air interface utilization, relative committed uplink rate, and relative committed downlink rate; and using pairs of thresholds (hysteresis) to decide whether congestion has occurred; and perform a congestion avoidance procedure. - View Dependent Claims (6, 7, 8)
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9. A method for congestion avoidance in 4G networks, comprising:
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detecting congestion; and performing a congestion avoidance procedure, wherein the congestion avoidance procedure comprises; entering a congested state; and exiting the congested state; wherein entering the congested state comprises; a base station informing a self-organizing network (SON) server of the congestion by sending a CONGESTION_INFORM message; the SON server receiving the CONGESTION_INFORM message; the SON server calculating a dense neighbor list; the SON server sending the dense neighbor list to the congested base station; the SON server calculating a new handover triggers configuration; the SON server sending the calculated handover triggers to the congested base station; the SON server removing the congested base station from a neighbor list of neighboring base stations; and SON server distributing the newly generated neighbor list to all neighboring base stations. - View Dependent Claims (10, 11)
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12. A method for congestion avoidance in 4G networks, comprising:
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detecting congestion, and performing a congestion avoidance procedure, wherein the congestion avoidance procedure comprises; entering a congested state, and exiting the congested state; wherein exiting the congested state comprises; a base station informing a self-organizing network (SON) server the congestion has cleared by sending a CONGESTION_RELEASE message; the SON server receiving the CONGESTION_RELEASE message; the SON server calculating a sparse neighbor list; the SON server sending the sparse neighbor list to the congested base station; the SON server calculating a new handover triggers configuration; the SON server sending the calculated handover triggers to the previously congested base station; the SON server placing the congested base station back to a neighbor list of neighboring base stations; and the SON server distributing the newly generated neighbor list to all neighboring base stations. - View Dependent Claims (13, 14)
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Specification