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EDGE-PRIORITIZED CHANNEL- AND TRAFFIC-AWARE UPLINK CARRIER AGGREGATION IN LTE-ADVANCED SYSTEMS

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EDGE-PRIORITIZED CHANNEL- AND TRAFFIC-AWARE UPLINK CARRIER AGGREGATION IN LTE-ADVANCED SYSTEMS. AUTHORS R. SIVARAJ, A. PANDE, K. ZENG, K. GOVINDAN, P. MOHAPATRA . PRESENTER R. SIVARAJ, Ph.D student in CS, UC DAVIS, CA, USA Email: rsivaraj AT ucdavis DOT edu - PowerPoint PPT Presentation

Text of EDGE-PRIORITIZED CHANNEL- AND TRAFFIC-AWARE UPLINK CARRIER AGGREGATION IN LTE-ADVANCED SYSTEMS

DYNAMIC CLUSTERING-BASED ADAPTIVE MOBILE GATEWAY

EDGE-PRIORITIZED CHANNEL- AND TRAFFIC-AWARE UPLINK CARRIER AGGREGATION IN LTE-ADVANCED SYSTEMSAUTHORSR. SIVARAJ, A. PANDE, K. ZENG, K. GOVINDAN, P. MOHAPATRA PRESENTERR. SIVARAJ,Ph.D student in CS,UC DAVIS, CA, USAEmail: rsivaraj AT ucdavis DOT eduhttp://spirit.cs.ucdavis.edu

11AGENDA OF THE PRESENTATIONINTRODUCTIONISSUES IN EXISTING LITERATUREPROBLEM STATEMENTKEY CONTRIBUTIONSWHY UPLINK?SYSTEM MODELCARRIER AGGREGATIONSCHEDULINGPERFORMANCE EVALUATIONDISCUSSIONCONCLUSION

22INTRODUCTION TO LONG TERM EVOLUTION800 MHz1525 MHz1900 MHz2025 MHz2600 MHz10 MHz CC15 MHz CC20 MHz CC5 MHz CC1.4 MHz CC9033INTRODUCTION TO LTE-ADVANCEDLTE RELEASE 10 (4G CELLULAR NETWORK EVOLVED FROM OFDMA LTE)PROVISIONING NEXT-GEN TELECOMMUNICATION SERVICESPEAK DATA RATES:DOWNLINK (Low Mobility): 1 GbpsUPLINK (Low Mobility): 500 MbpsDOWNLINK (High Mobility): 100 MbpsPEAK BANDWIDTH: 100 MHzAGGREGATION OF UPTO 5 COMPONENT CARRIERSSCALABLE LTE BANDWIDTHS RANGING FROM 1.4 MHz to 20 MHzPHYSICAL RESOURCE BLOCKS (PRB)CONSTITUENT OF 12 SUB-CARRIERS (EACH 18 kHz) MINIMUM RESOURCE ALLOCATION UNIT FOR ANY UEDOWNLINK: CONTIGUOUS/DIS-CONTIGUOUS SUB-CARRIERS FOR A SINGLE PRB (CHANNEL)UPLINK: CONTIGUOUS SUB-CARRIERS FOR A SINGLE PRB (RECOMMENDED)44CARRIER AGGREGATIONSESSION ADMISSION CONTROLL3 CC ASSIGNMENTL2 PACKET SCHEDULINGL2 PACKET SCHEDULINGL2 PACKET SCHEDULINGLINK ADAPTATIONLINK ADAPTATIONLINK ADAPTATIONHARQHARQHARQMACMACMACCCCCCC55Next to room 281. Inside the gym. My room key ISSUES IN EXISTING LITERATURE

I wanna stream a HD video Am in here for a video conferencing A VoIP call to my managerAh !!!! Jus wanna surf FacebookSend an email to my boss applying for leaveVideo gaming with my friends for the next half-hourEdge UEs contribute to a bulkier data Center/Close to center UEs contribute to less UL trafficNow I wanna surf FacebookSame number of resources for both ?66Attention Deficit Hyperactivity disorderGrouping of UEs based on spatial correlation Similar channel conditions and radio characteristics

UE GROUPING

CQICQICQICQICQICQI77KEY CONTRIBUTIONS OF THE PAPERPROBLEM STATEMENT: How to optimally provision next-generation telecommunication services in LTE-Advanced uplink ?APPROACH:Prioritization of cell-edge UE groups for channel- and Traffic-aware Carrier AggregationEffectively accommodates log-normal shadowing, channel fading and propagation losses which adversely impact edge throughputEfficient representation of under-represented weak terminalsProfile-based Proportional Fair Packet SchedulingResolves contention of resources using inter- and intra-group scheduling on a time-domain and frequency-domain basis

88MOTIVATION - WHY UPLINK ?HIGHER UPLINK TRAFFIC WITH THE EVOLUTION OF WEB 2.0 UPLINK COULD POSSIBLY EXCEED DOWNLINK IN 2020 (CISCO ESTIMATES)MOBILE TERMINALS MORE POWER-LIMITED THAN THE eNodeBRADIO CHANNEL CHARACTERISTICS (LIKE PATH LOSS) INFLUENCE UE TRANSMISSION POWERFREQUENCY DIVERSITY AND AMC : NOT EFFECTIVELY-UTILIZED IN THE UPLINKMOTIVATION FOR SUBSCRIBERS TO CONTRIBUTE TO UPLINK TRAFFIC FROM THEIR HAND-HELD DEVICES

99MOTIVATION - WHY CHANNEL-AWARE AND EDGE ?

41% INCREASE IN THROUGHPUT OVER CHANNEL-BLIND ASSIGNMENT57% INCREASE IN EDGE UE THROUGHPUTPATH LOSS-BASED ASSIGNMENT FOR CHANNEL AWARENESS

1010CALCULATEAMBRSYSTEM MODEL

NON-ADJACENT INTER-BAND CARRIER AGGREGATION (800 MHz, 1525 MHz, 1800 MHz, 2025 MHz, 2600 MHz)FOR ANY UE, ASSIGNABLE CC SET CONTAINS CCs WHOSE PATH LOSS IS LESS THAN A PRE-DEFINED THRESHOLD ASSIGN RESOURCES ONLY FROM ASSIGNABLE CCs TO UE GROUPSUEs FROM EACH GROUP SEND QCI TO eNB (TRAFFIC SUBSCRIPTION)DETERMINATION OF AMBR REQUIREMENTS FOR EACH GROUPEQUAL POWER ALLOCATION ON ALL FREQUENCY BANDS WITH SINR, CQI AND SPECTRAL EFFICIENCY COMPUTATIONS:

QCIQCI1111ClamAVDISTRIBUTION OF ASSIGNABLE CCs TO UEs

CC1CC2CC3CC4CC5UE1UE2UE3UE4UE5N1212CARRIER AGGREGATION THE OBJECTIVEAGGREGATING THE CCs AND ASSIGNING THEIR PRBs TO THE GROUPSTheoretical Formulation: NP-Hard Generalized Assignment Problem:

SOLUTION : SUBSET OF ITEMS (AGGREGATED CARRIER U) TO BE ASSIGNED TO THE BINSFEASIBLE SOLUTION: SOLUTION WITH MAXIMUM PROFIT (ACHIEVED UPLINK THROUGHPUT)

CC1CC2CCi

CCnITEMSBINSG1G2Gj Gm W1 W2 Wj Wmpij

ij

1313HEURISTICSPRIORITIZING THE SPATIAL GROUPS : = SET OF ASSIGNABLE CCs FOR UE r IN GROUP Gi i:= SET OF ASSIGNABLE CCs FOR GROUP Gi

PRIORITY METRIC :=

LEAST PRIORITIZATION OF CELL-CENTER UEs IN RESOURCE ALLOCATION COULD STILL GUARANTEE ALLOCATION OF GOOD CCs

8001525180020252600G1G2GjGmMGi1414PROOF OF CORRECTNESS THE INTUITIONASSIGNABLE RESOURCES FOR GROUP Gi :

ASSIGNABLE RESOURCES FOR GROUP Gj :

ASSUME Gj GETS A HIGHER PRIORITY THAN Gi (by contradiction):A,B,C COULD BE ASSIGNED TO Gj (worst case traffic requirement)ASSIGNABLE RESOURCES FOR Gi EXHAUSTED (SHOULD BE SCHEDULED IN THE NEXT TIME SLOT)IF Gi GETS A HIGHER PRIORITY THAN GjA,B,C COULD BE ASSIGNED TO Gi (worst case traffic requirement)D,E COULD STILL BE ASSIGNED TO GjHIGHER ADVERSE IMPACT FOR THE FORMER CASE NOT A NEARLY OPTIMAL SOLUTION

ABCABCDE1515PRB ASSIGNMENT GOALTo allocate the best set of contiguous channels to the UE groupsTo minimize resource contention and dependency on schedulingAlready assigned resource/CC considered for re-assignment to another group only while lack of choice for the other groupFORMULATION:

Sum of estimated bandwidths of UEs of group Gi yij := Fraction of the total number of PRBs in CC j allocated to Gi := Available bandwidth in CC j for group Gi

ij

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PRB ASSIGNMENTTraffic requirement for any group Gi :

Estimate the SINR, CQI and MCS Spectral Efficiency values for all the PRBs across each assignable CC for a given UE transmission power and path loss modelSpectral Efficiency is given by:

Channel allocation follows Maximum Throughput algorithm using the computed MCS levels

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SCHEDULINGTO RESOLVE CONTENTION AMONGST THE UE GROUPS AND INDIVIDUAL UEsPHASE I : TIME DOMAIN-BASED INTER-GROUP PFPS

PROFILE-BASED TD METRIC:

SERVICE PRIORITIZATION

G1G2COMMON RESOURCESt1t21818

SCHEDULINGINTRA-GROUP FREQUENCY-DOMAIN PFPS:

UE with maximum FD metric :

Total number of PRB combinations:

UE1UE3UE2

1919SIMULATION DETAILSNS3 LENA LTE/EPC NETWORK SIMULATORFULLY-IMPLEMENTED LTE UPLINK PHY AND MAC FUNCTIONALITIESFEATURES INCLUDE MODELING THE AMC, PATH LOSS MEASUREMENTS, CHANNEL-STATE INFORMATION FEEDBACKCELL SIZE 1 kmNON-ADJACENT FREQUENCY BANDS = 10 (5 CCs CHOSEN FOR CA)FREQUENCY BANDS : 800, 1525, 1800, 2025, 2600 MHzCONSTANT POSITION MOBILITY MODEL FOR eNB, CONSTANT VELOCITY MOBILITY MODEL FOR UesUNIFORM UE DISTRIBUTION ACROSS THE CELLMAXIMUM 10 UEs PER CELL, (MAX. 5 HIGH-END TRAFFIC APPLICATIONS PER UE), GBR TRAFFIC APPLICATIONSJAKES FADING MODEL, LOG NORMAL SHADOWING, 23 dBM UE TRANSMISSION POWER, 43 dBM eNB TRANSMISSION POWER, -120 dBM THRESHOLD PATH LOSS, -174 dBM/Hz NOISE SPECTRAL DENSITY

2020TRAFFIC DETAILS

2121RESULTSCC ASSIGNMENT (IMPR 33%, 15%)INTER- AND INTRA-GROUP PFPS (IMPR 15%, 21%)

2222

RESULTS

CC ASSIGNMENT IN UNIFORM SCENARIOCC ASSIGNMENT (EDGE UEs) (IMPR. 64%, 54%)2323RESULTS

INTER- AND INTRA-GROUP PFPS (EDGE UEs IMPR. 62%)UNIFORM CC ASSIGNMENT (EDGE UEs IMPR. 10%)2424RESULTS

CDF OF LTE-A UPLINK THROUGHPUT (IMPR. 20%, SD 14%)ACHIEVED GBR (91.7%, 87.4%)2525 DISCUSSIONLUSIONSIMPACT ON POWER OPTIMIZATION :ESTIMATED TRANSMISSION POWER FOR UE ON ANY CC:

LOW VALUES OF M AND PL FROM OUR PROPOSED MECHANISMS MINIMIZES POWER CONSUMPTIONREST OF THE PARAMETERS ARE CC-SPECIFIC OPEN-LOOP AND CLOSED-LOOP VALUESNOT APPLICABLE TO HIGH-SPEED MOBILE UEs NO DISTINCT CELL-CENTER AND CELL-EDGE UEs, IRRELEVANT FEEDBACKREQUIRES COORDINATION AMIDST MULTIPLE, NEIGHBORING eNBs

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26CONCLUSIONSCHANNEL- AND TRAFFIC-AWARENESS IN RESOURCE ALLOCATION FOR LTE-ADVANCED SYSTEMSFOCUS ON UPLINK CARRIER AGGREGATION CC ASSIGNMENT AND PFPSMOTIVATION FOR GROUPING OF UEsCC ASSIGNMENT PROBLEM THEORETICALLY-MODELLED AS NP-HARD GENERALIZED ASSIGNMENT PROBLEMPROPOSAL OF EDGE-PRIORITIZED CC ASSIGNMENTPROPOSAL OF TIME-DOMAIN INTER-GROUP AND FREQUENCY-DOMAIN INTRA-GROUP PFPSPERFORMANCE EVALUATION 33% IMPR IN CC ASSIGNMENT AND 15% IMPROVEMENT IN SCHEDULING MECHANISMSDOWNLINK LTE-ADVANCED MULTICAST, HIGH-SPEED SCENARIO ENVISIONED FOR FUTURE WORK

2727QUERIES??2828THANK YOU2929

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