Joint Optimization of Access Point Placement and ... - alexandre gondran
2. Frequency Assignment Problem. 3. Our approach. 4. ACP and AFP combination. 5. Conclusion/Perspectives. WLAN Planning. 1. selecting a location for each ...
Third International Conference in Central Asia on Internet The Next Generation of Mobile, Wireless and Optical Communications Networks
Joint Optimization of Access Point Placement and Frequency Assignment in WLAN September 26 - 28, 2007 Tashkent University of Information Technologies TUIT, Tashkent, Uzbekistan
A. Gondran – A. Caminada O. Baala – H. Mabed
Agenda 1. Problem 2. Frequency channel assignment 3. Our approach 4. ACP and AFP combination 5. Conclusion/Perspectives
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
1. Problem WLAN Planning 1. selecting a location for each transmitter 2. setting the parameters of all transmitters Objectives: providing users wireless access to their local network. respecting financial requirements guarantying a given quality of service.
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
– Constraints are added to the location problem in order to ease the frequency channel assignment – The global problem is over-constrained
Simultaneously : very rare – Only three channels with co-channel interference (Wertz04)
1. Problem 4. ACP and AFP Combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
2. Frequency assignment • Share the resources: frequency channels • IEEE 802.11b/g: 13 channels (3 non-overlapping)
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
2. Frequency Assignment • 3 non-overlapping channels – More than 3 antennas => interferences – Interference: computation of SINR (Signal-to-Interferenceplus-Noise-Ratio) – Spreading interference over the whole area
• 2 approaches – Global view: interference at cell level: 3-graph colouring T-coloration – Local view: interference at user level: SINR computation
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
2. SINR computation Signal to Interference plus Noise Ratio • One user receives several signals – Best signal – Interfering signals
• Measurement
SINR =
Pbest signal
∑P
interfering
γ (∆f ) + N
• Maximising the SINR
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
3. New approach: unifying both problems and both criteria Transmitter Location + Frequency Assignment (Coverage + Interferences)
real bit rate • The bit rate provided by the network is unique and takes into account all variables (location, setting and frequency) • Require calculus – higher computation time
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
3. Our fitness
∑ (c
a∈ AP
s
+ ca ) + β ×
∑
t ∈ users
max(0, −∆ t )
Deviation between the bit rate desired by the user and the real bit rate provided by the network on downlink interference basis Gondran A., Caminada A., Fondrevelle J., Baala O., “Wireless LAN planning: a didactical model to optimise the cost and effective payback”. International Journal of Mobile Network Design and Innovation 2007 - Vol. 2, No.1 pp. 13 - 25
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
3. Our fitness
∑ (c
a∈ AP
s
+ ca ) + β ×
∑
t ∈ users
max(0, −∆ t )
Sum of all network users bit rate lack (in kbps) weighted by a financial cost β Optimisation under constraints of coverage (minimum bit rate for all users)
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
4. Joint ACP and AFP •
Originality – – – –
•
tackling both problems in the same time multiple interfering signals are used to compute SINR 13 available channels (not only 3) Large-scale combinatory !!!
Comparing 3 strategies – – –
strategy 1: ACP without channel and 13-channels AFP successively strategy 2: 3-channels ACP and 13-channels AFP successively strategy 3: 13-channels ACP and AFP together
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
4. Joint ACP and AFP Optimisation process - Local search - 20mn on Pentium 4 - 1 run
150 m
Testbed - 2 floor building 40 m - 94 candidate sites - 2 antenna patterns - 4 levels of emitted power 93
=>
∑C p =0
p 93
(408) ≈ 10 p
Floor 1 242
configurations
- demand : 600 users (300 on each floor) 500kbps => 300Mbps 8800 test point (SINR)
Floor 2
3. Our approach
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
4. Joint ACP and AFP Optimisation process - Local search - 20mn on Pentium 4 - 1 run
150 m
Testbed - 2 floor building 40 m - 94 candidate sites - 2 antenna patterns - 4 levels of emitted power Floor 1
93
=>
∑C p =0
p 93
(408) ≈ 10 p
242
configurations
- demand : 600 users (300 on each floor) 500kbps => 300Mbps 8800 test point (SINR)
Floor 2
3. Our approach
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
4. ACP and AFP combination – strategy 1: ACP without channel and 13-channels AFP successively – strategy 2: 3-channels ACP and 13-channels AFP successively – strategy 3: 13-channels ACP and AFP together
strategy 1 strategy 2 strategy 3 21
37
40
AP number
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
4. ACP and AFP combination – strategy 1: ACP without channel and 13-channels AFP successively – strategy 2: 3-channels ACP and 13-channels AFP successively – strategy 3: 13-channels ACP and AFP together TP uncovered
strategy 1 147
strategy 2
4
strategy 3 0 21
37
40
AP number
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
4. ACP and AFP combination – strategy 1: ACP without channel and 13-channels AFP successively – strategy 2: 3-channels ACP and 13-channels AFP successively – strategy 3: 13-channels ACP and AFP together TP unsatisfied
TP uncovered
strategy 1 1709
147
strategy 2
4
405
strategy 3 0 21
37
40
0 AP number
1. Problem 4. ACP and AFP combination
Floor 1 strategy 1
strategy 2
strategy 3
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
150 m
40 m
1. Problem 4. ACP and AFP combination
Floor 2 strategy 1
strategy 2
strategy 3
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
1. Problem 4. ACP and AFP combination
2. Frequency Assignment Problem 5. Conclusion/Perspectives
3. Our approach
5. Conclusion/Perspectives • First results – simultaneous ACP/AFP is convincing – feasible solution found quickly (minimum service) – about 250 networks are evaluated per second (for 8800 test points)
• To do: comparison – with results from others groups (model / algorithm / test) – with manual deployment – with others successive approach
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