Load balancing in interaction with handover...
Transcript of Load balancing in interaction with handover...
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FP7 ICT-SOCRATES
Load balancing in interaction with handover
optimisationp
Presented by Andreas LobingerNokia Siemens Networks
FP7 SOCRATES final workshopKarlsruhe, Germany
22 F b 201122 February 2011
Contributors: Irina Balan (IBBT), Thomas Jansen (TU BS), Szymon Stefanski (NSN)
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Outline
Overview on Load Balancing (LB)(Deliverable 5.9: section 8.4)
Overview on Handover Parameter Optimization (HPO) Overview on Handover Parameter Optimization (HPO) (Deliverable 5.9: section 8.3)
LB + HPO integration, problem description LB + HPO, coordination approach
(D li bl 5 9 ti 9 1)(Deliverable 5.9: section 9.1)
Conclusions and future work
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Andreas Lobinger, Nokia Siemens Networks, CTO Research
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Load Balancing (LB)
General Idea: Shift load of a overloaded cell by forced handovers to surrounding low loaded cells t d i h i th l d diti f t k so act on dynamic changes in the load conditions of a network self optimisation.
SeNB TeNB
Control paramters:– Cell Individual Offsets for HO
What is load?
SeNB TeNB
Hysteresis h2
What is overload?y
Di t
LB HO offset
Hysteresish1
Distance
SeNB TeNB
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Andreas Lobinger, Nokia Siemens Networks, CTO Research
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LB, example result
Typical simulation scenarios contain an area of high load and some dynamic changes ( here moving the hotspot)
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scenario 3
referencewith load balancing
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non-regular network; hotspot is moving from cell 27 to 13
Base Stationshotspot route
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General idea: Gather information in the network about mobility
Handover Parameter Optimization (HPO)
General idea: Gather information in the network about mobility problems and control the handover parameters to reduce them. generate reasonable parameters for decent network performanceg p p Information as KPI (key performance indicators) of typical handover
problems – Radio Link Failure– Handover Failure
Pi P h d– Ping-Pong handover Parameters controlled
Hysteresis– Hysteresis– Time To Trigger
The effect of HO parameterpchanges
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HPO, example results
Simulation scenarios: Regular Networks, all users the same speed
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Handover failure ratioPingPong handover ratioRadio link failure ratio
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Hysteresis [dB]Time-to-Trigger [s]
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Hysteresis [dB]Time to Trigger [s] 100 200 300 400 500 600 700 800 900 1000Simulation Time [s]
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Approach: Run both algorithms in parallel and use a coordinator to
Integrated Use Case, LB + HPO
Approach: Run both algorithms in parallel and use a coordinator to limit the controls of the system. Note: Both algorithms use the HO decisiong
Interaction example:e ac o e a p e• Overload in SeNB shifts cell
border to point 2• Some user in the area
between point 1 and 2 will be handovered to TeNB ig
nal s
treng
th
handovered to TeNB• Increase of the Hysteresis in
TeNB can then shift the borderR
ecei
ved
s
TeNB can then shift the border to point 3 and increase the load in SeNB again
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Integrated Use Case, LB + HPO
Coordinator approach following th f k f ththe framework of the SONcoordinator
– Coordination withCoordination with higher priority for HPO (COO1)C di ti ith– Coordination with higher priority for Load Balancing (COO2)
– Coordination mechanism to
mechanism to avoid abnormal situations (COO3)
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Integrated Use Case LB + HPO, example results25
referenceHPO
6Ping-Pong Handover Ratio
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HPOLBLB + HPOLB + HPO + COO
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Use
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Handover Failure Ratio
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t [s]
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40unsatisfied usersHPIping pong
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HPIRadio Link Failure
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reference HPO LB HPO + LB COO0
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Conclusion and Outlook
In the HPO and LB use cases dedicated optimization algorithms were designed. Just putting them together can lead to additional old or new
problems. With a coordinator giving priority to one or the other algorithm With a coordinator giving priority to one or the other algorithm
already some problems can be resolved. A full coordinator also looking at interaction or abnormal behaviourA full coordinator also looking at interaction or abnormal behaviour
can lead to reasonable system performance.
Integration does not stop here … Still the details of a coordinator role or network function is ffs in
3GPP
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Andreas Lobinger, Nokia Siemens Networks, CTO Research
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Thank you.
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