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 http://spirit.cs.ucdavis.edu 1
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EDGE-PRIORITIZED CHANNEL- AND TRAFFIC-AWARE UPLINK CARRIER AGGREGATION IN LTE-ADVANCED SYSTEMS
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
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EDGE-PRIORITIZED CHANNEL- AND TRAFFIC-AWARE UPLINK CARRIER
AGGREGATION IN LTE-ADVANCED SYSTEMSAUTHORS
R. 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
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AGENDA OF THE PRESENTATION
INTRODUCTION ISSUES IN EXISTING LITERATURE PROBLEM STATEMENT KEY CONTRIBUTIONS WHY UPLINK? SYSTEM MODEL CARRIER AGGREGATION SCHEDULING PERFORMANCE EVALUATION DISCUSSION CONCLUSION
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INTRODUCTION TO LONG TERM EVOLUTION
800 MHz
1525 MHz
1900 MHz
2025 MHz
2600 MHz
10 MHz CC
15 MHz CC
20 MHz CC
5 MHz CC
1.4 MHz CC
90
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INTRODUCTION TO LTE-ADVANCED
LTE RELEASE 10 (4G CELLULAR NETWORK – EVOLVED FROM OFDMA LTE) PROVISIONING NEXT-GEN TELECOMMUNICATION SERVICES PEAK DATA RATES:
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 GROUPS UEs FROM EACH GROUP SEND QCI TO eNB (TRAFFIC SUBSCRIPTION) DETERMINATION OF AMBR REQUIREMENTS FOR EACH GROUP EQUAL POWER ALLOCATION ON ALL FREQUENCY BANDS WITH SINR, CQI AND
SPECTRAL EFFICIENCY COMPUTATIONS:
QCI
QCI
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DISTRIBUTION OF ASSIGNABLE CCs TO UEs
CC1
CC2
CC3
CC4
CC5
UE1
UE2
UE3
UE4
UE5
N
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CARRIER AGGREGATION – THE OBJECTIVE
AGGREGATING THE CCs AND ASSIGNING THEIR PRBs TO THE GROUPS Theoretical Formulation: NP-Hard Generalized Assignment Problem:
SOLUTION : SUBSET OF ITEMS (AGGREGATED CARRIER U) TO BE ASSIGNED TO THE BINS
FEASIBLE SOLUTION: SOLUTION WITH MAXIMUM PROFIT (ACHIEVED UPLINK THROUGHPUT)
CC1 CC2 CCi … CCn ITEMS
BINSG1 G2 Gj … Gm
W1 W2 Wj … Wm
pijβij
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HEURISTICS PRIORITIZING 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
800
1525
1800
2025
2600
G1
G2
Gj
…
Gm
MGi
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PROOF OF CORRECTNESS – THE INTUITION
ASSIGNABLE 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 Gj
A,B,C COULD BE ASSIGNED TO Gi (worst case traffic requirement) D,E COULD STILL BE ASSIGNED TO Gj
HIGHER ADVERSE IMPACT FOR THE FORMER CASE – NOT A NEARLY OPTIMAL SOLUTION
A B C
A B C D E
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PRB ASSIGNMENT GOAL
To allocate the best set of contiguous channels to the UE groups To minimize resource contention and dependency on scheduling Already assigned resource/CC – considered for re-assignment to another
group only while lack of choice for the other group FORMULATION:
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 βij
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PRB ASSIGNMENT
Traffic 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 model
Spectral Efficiency is given by:
Channel allocation follows Maximum Throughput algorithm using the computed MCS levels
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SCHEDULING TO RESOLVE CONTENTION AMONGST THE UE GROUPS AND
INDIVIDUAL UEs PHASE I : TIME DOMAIN-BASED INTER-GROUP PFPS
PROFILE-BASED TD METRIC:
SERVICE PRIORITIZATION
G1 G2
COMMON RESOURCES
t1t2
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SCHEDULING INTRA-GROUP FREQUENCY-DOMAIN PFPS:
UE with maximum FD metric :
Total number of PRB combinations:
UE1 UE3 UE2
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SIMULATION DETAILS1. NS3 LENA – LTE/EPC NETWORK SIMULATOR2. FULLY-IMPLEMENTED LTE UPLINK PHY AND MAC FUNCTIONALITIES3. FEATURES INCLUDE MODELING THE AMC, PATH LOSS MEASUREMENTS,
CHANNEL-STATE INFORMATION FEEDBACK CELL SIZE 1 km NON-ADJACENT FREQUENCY BANDS = 10 (5 CCs CHOSEN FOR CA) FREQUENCY BANDS : 800, 1525, 1800, 2025, 2600 MHz CONSTANT POSITION MOBILITY MODEL FOR eNB, CONSTANT VELOCITY
MOBILITY MODEL FOR Ues UNIFORM UE DISTRIBUTION ACROSS THE CELL MAXIMUM 10 UEs PER CELL, (MAX. 5 HIGH-END TRAFFIC APPLICATIONS PER