LTE Parameter - Bearer Management

Admission Control

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Radio Admission Control Introduction (1/3) • Scope of RAC is cell level • RAC algorithms controls establishment of – Signaling radio bearer – Data Radio Bearer

• RAC controls number of UE in a cell – Number of established RRC connection connec tion per cell Number of active UEs (users) per cell











Radio Admission Control Introduction (2/3) • RAC applies different criteria for call estblishment and Mobility (HO) – offset in terms of number of rrc connections or connections or active active users used, etc – aim is to keep the already established sessions active and support user mobility

• RAC interacts with other RRM entities – Packet Scheduler











Radio Admission Control Introduction (3/3) • Smart Admission Control – Necessity when offering high bit rate services – Configuration Configuration of access control threshold per cell simplified for GBR traffic – RAC reacts on measurements and therefore is adapted in a dynamic way – Congestion control control function allows more optimistic admission decisions, and the system corrects overbooking situations using preemption according to priorities (Radio)

Service management High RB requests with congestion control by using of priority and smart admissions Rejected UE requests due of too high RB utilization  Only for QCI 2-4 S-RAC  Not for VoIP

Descriptions / Objective:













Smart Admission Admission control

























Radio Admission Control













Admission of SRB1













Admission of SRB1































































































Radio Admission Control for Intra-Frequency HO Definition of new admission control threshold for time critical HO: • HoThre HoThreshR shRrc rc = maxNumRrc maxNumRrc + + max(addAUeTcHo max(addAUeTcHo , addAUeRrHo ) • HoTh HoThre reshU shUe e = maxNumActUe maxNumActUe + + max(addAUeTcHo max(addAUeTcHo , addAUeRrHo ) • HoThre HoThreshD shDrb rb = maxNumActDrb + max(addNumDrbRadioReasHo max(addNumDrbRadioReasHo,, addNumDrbTimeCriticalHo addNumDrbTimeCriticalHo)) • HoThre HoThreshGb shGbrr = maxNumQci1Drb + max( addNumQci1DrbRadioReasHo addNumQci1DrbRadioReasHo,, addNumQci1DrbTimeCriticalHo addNumQci1DrbTimeCriticalHo))











Smart admission Control • Smart Radio Admission Control – Default: max 75% of PRBs (air transmission resources) available for GBR traffic – RAC checks unchanged compared to RL40  Amount of RRC_Conne RRC_Connections ctions (SRBs)  Amount of active Ues  Amount of active DRBs

maxGbrTrafficLimit Maximum radio resource consumption (PRBs) for GBR traffic in UL and an d DL LNCEL; 30... 90; 75











Smart admission Control RL40 – GBR-DRB admission takes into account:    

Requested bit rate UL/DL (incl. corrections for header info, etc) Radio conditions derived from CQI information etc (=> transmission efficiency in bits/PRB) Current load in cell (available PRB resources) Configured threshold for GBR traffic

– Congestion Handling  If GBR-traffic cannot be scheduled according to QoS requirements RAC is informed to select candidates (with the help of ARP-AC) to be kicked out in order to free resouces.











Smart admission Control RL40 Estimate throughput capacity

•

eNodeB estimates throughput per capacity efficiency; kbit/s possible per RB from CQI / SINR

•

eNodeB knows GBR requested by new user

•

eNodeB calculates from efficiency

User requested GBR

Calculate required RB











ARP Based Admission Admission Control –RL40 • Basic rules for preemption (according to 3GPP) – Priority Level    

Values between 1 and 14 1  highest priority; 14  lowest priority Only E-RABs with lower priority may may be be preempted Note: Value 15 is ‘no priority’ priority’ and correspond to preemption capability and vulnerability unset

– Preemption Capability  If set, this E-RAB may preempt others

maxNumPreEmptions Limits the number of pre-emptions which













ARP Based Admission Admission Control –RL40



















































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LTE Parameter - Bearer Management

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