Flow admission control for wireless systems

Abstract

An apparatus for a wireless communication system that includes means for determining available resources in the wireless communication system and means for determining an admission of a flow.

1 . An apparatus adapted for communications, comprising:
 at least one processor configured to:
 determine a threshold based on a time slot, utilization by flows and priority violations associated with existing flows; 
 monitor the time slot utilization; 
 monitor the priority violations; and 
 admit a new flow if the total time slot utilization is below the threshold. 
   
     
     
         2 . The apparatus of  claim 1 , wherein the processor is further configured to determine a threshold for admitting a new Expedited Forwarding (EF) flow based on a fraction of time slots utilized by all EF flows. 
     
     
         3 . The apparatus of  claim 1 , wherein the processor is further configured to determine a threshold for admitting a new Assured Forwarding (AF) flow based on the sum of an actual time fraction of each AF flow, scaled by a ratio of a required minimum rate and a measured throughput of the new AF flow. 
     
     
         4 . The apparatus of  claim 1 , wherein a new AF flow is admitted if the total F′F plus AF utilization is no larger than a quality of service (QoS) threshold. 
     
     
         5 . The apparatus of  claim 1 , wherein the processor is further configured to schedule an adjustment of an existing flow. 
     
     
         6 . The apparatus of  claim 1 , wherein the processor is further configured to degrade an AF flow to a Best Effort (BE) flow if, over a period of time, the AF flow throughput is low compared with a minimum required rate. 
     
     
         7 . The apparatus of  claim 1 , wherein the processor is further configured to compute an average DRC for all new flows. 
     
     
         8 . The apparatus of  claim 1 , wherein the processor is further configured to terminate an EF flow, if its packet loss rate exceeds a value for a period of time. 
     
     
         9 . A method for communications, comprising:
 determining a threshold based on a time slot utilization by flows and priority violations associated with existing flows;   monitoring the time slot utilization;   monitoring the priority violations; and   admitting a new flow if the total time slot utilization is below the threshold.   
     
     
         10 . The method of  claim 9 , further comprising determining a threshold for admitting a new Expedited Forwarding (EF) flow based on a fraction of time slots utilized by all EF fl flows. 
     
     
         11 . The method of  claim 9 , further comprising determining a threshold for admitting a new Assured Forwarding (AF) flow based on the sum of an actual time fraction of each AF flow, scaled by a ratio of a required minimum rate and a measured throughput of the new AF flow.) 
     
     
         12 . An apparatus adapted for communications, comprising:
 means for determining a threshold based on a time slot utilization by flows and priority violations associated with existing flows;   means for monitoring the time slot utilization;   means for monitoring die priority violations; and   means for admitting a new flow if the total time slot utilization is below the threshold.   
     
     
         13 . The apparatus of  claim 13 , further comprising means for determining a threshold for admitting a new Expedited Forwarding (EF) flow based on a fraction of time slots utilized by all EF flows. 
     
     
         14 . The apparatus of  claim 13 , further comprising means for determining a threshold for admitting a new Assured Forwarding (AF) flow based on the sum of an actual time fraction of each AF flow, scaled by a ratio of a required minimum rate and a measured throughput of the new AF flow. 
     
     
         15 . A computer-readable medium comprising instructions stored thereon for execution by a processor to:
 determine a threshold based on a time slot utilization by flows and priority violations in real time for existing flows;   monitor the time slot utilization;   monitoring the priority violations; and   admit a new flow only if the total time slot utilization is below the threshold.   
     
     
         16 . The computer-readable medium of  claim 15 , further comprising instructions for execution by a processor to determine a threshold for admitting a new Expedited Forwarding (EF) flow based on a fraction of time slots utilized by all EF flows. 
     
     
         17 . The computer-readable medium of  claim 15 , further comprising instructions for execution by a processor to determine a threshold for admitting a new Assured Forwarding (AF) flow based on the sum of an actual time fraction of each AF flow, scaled by a ratio of a required minimum rate and a measured throughput of the new AF flow.