Wideband Simulation Results

1
Wideband Simulation Results

• AGCFG 3 ACP WG-C11
• Lommaert Luc DAS/CSM
• 18-19 September, Brussels

European Organisation for the Safety of Air
Navigation
2
Overview

• Cellular Coms Capacity estimation for aviation
• Scenario definition for modelling CDMA2000 UMTS
• Agilent - Wideband Simulations ? GENERIC
  SIMULATOR
• Roke Manor / Siemens - Wideband Simulations ?
  SAAM DATA
• Conclusions

3
CELLULAR CAPACITY FREQUENCY RE-USE
F2
F1
F7
F3
F1
F4
F6
F5
CDMA CLUSTER SIZE1
GSM CLUSTER SIZE7
4
Cellular Capacity - Interference Considerations
AVIATION LEADS TO 3D SITUATION?INTERFERENCE ?
Propagation losses make Signals decay with 2nd
order Due to Line of Sight ? adjacent cell
INTERFERENCE will increase
Saved by Radio Horizon
Ioc
Propagation losses make Signals decay with 4th -
5th order due to Rayleigh Fading (
buildings-trees..)
Isc
3th TIER
2nd TIER
1st TIER
5
Verification of compatibility of modelling tools

• Define a scenario for modelling
• Implement the scenario on the Siemens and Agilent
  tool, generate results
• Compare the results from the two modelling
  exercises and justify any disparities

6
Common Modelling Parameters
7
Direct Comparison of Results
At 2 Blocking, Mean No of Users Roke
46.8, Agilent 43.0

• Agilent Model includes extra-cell interference
• Conclusion drawn is that Roke and Agilent
  Methodologies are essentially the same and lead
  to comparable results

8
Agilents Generic Capacity Simulator
Single cell , Infinite Power
Standard ideal POLE capacity equations

• Adapted for
• keep-alive channels
• activity factor
• orthogonality factor
• other-cell interference

Forward link capacity
STATIC
Reverse link capacity
Bottleneck
STATISTIC Users Random allocated Uniform
distributed
Erlang capacity calculation (through Monte Carlo
simulation)
9
Simulation results Air interface specific
parameters

Values based on 3GPP2 C.S0010 (BS) and C.S0011
(MS) 3GPP 25.104 (BS) and 25.101 (MS)
10
Simulation results Ideal STATIC capacity

• Note
• STATIC capacity rough optimistic estimation
• The FL capacity is 3 to 4 times larger than the
  RL capacity
• Larger cells see less interference from
  neighboring cells ? more users

11
Final Simulation results Reverse link Erlang
capacity Cell size impact

Eb/No 6 dB CPICH/TCH-3,75dB
12
Simulation results Reverse link Erlang
capacity Antenna diversity impact

13
CDMA2000 9.6 kbps with RMR optimized system
parameters (Eb/No, R-PICH/TCH ) Reverse link
Erlang capacity

14
Roke Manor / Siemens Wideband Simulations

15
Simulation Methodology
COCR
Analysis
Traffic
Scenario
Definition
Simulation
SAAM Data
Analysis of
Deployment
Simulations
Processing
Results
Definition
Radio System
Parameter
Derivation
16
LSAZMP4 Service Volume
17
Wraparound
18
Total Number of Aircraft
19
Max Number of Aircraft in anyBS Sector
20
cdma2000 Simulation Parameters

• cdma2000 Release C
• Radio Configuration 1, Spreading Rate 1 (1.2288
  Mcps)
• Four Quasi-Orthogonal Codes with equal BS Power
• Max BS Tx Power 43 dBm, Pilot Power 20. Max
  20 Power/user
• Max Aircraft Tx Power 33 dBm
• Assumptions Two Antenna Base Station Diversity,
  0.2 FER, 1dB Implementation Loss

21
Simulations Results Future work

• COCR ? 9,6 kbps 10 activity
• Reverse Link Limited (as expected)
• Switzerland scenario presents the greatest
  challenge
• Higher number of aircraft
• Second cdma2000 carrier was required in this
  scenario
• Total Bandwidth Required 2025
• cdma2000 2 (carriers) x 2 (duplex) x 1.25 MHz
  5 MHz
• UMTS 1 (carrier) x 2 (duplex) x 5 MHz 10 MHz
• ALL SIMULATIONS DONE ON GREEN FIELD SPECTRUM
• L-band Interference study methodology
  M.1639/1477

22
CONCLUSIONS

• Large capacity improvements
• Eb/No target
• Keep-alive channel power fraction
• Sectorisation
• Both standards forsee in system parameters
  adaptation
• Support of all QoS (Conv, Stream, Interactive,
  Background)
• Support of multiple coders/decoders (Viterbi,
  Turbo)
• Support of multiple frame sizes ( 10,20,40,80ms)
• Use Packetdata channel i.s.o dedicated traffic
  channels
• COCR requirements met with FDD 2 x 5 MHz UMTS or
  2 x 1,25MHz CDMA2000

23
Thank You