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Performance Analysis of Decentralized RAN (Radio Access Network) Selection Schemes

Evaluate the efficiency of decentralized RAN selection schemes in wireless networks, examining achieved bandwidth, handovers, and power consumption.

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Performance Analysis of Decentralized RAN (Radio Access Network) Selection Schemes

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  1. Performance Analysis of Decentralized RAN (Radio Access Network) Selection Schemes December 28th, 2004 Yang, Sookhyun

  2. Contents • Introduction • Previous Works • RAN Selection Schemes • Evaluation Method • Performance Analysis • Conclusion

  3. Background • Emerging various wireless access technologies • 2G, 3G celluar, satellite, WiBro/WiMax (IEEE 802.16), Wi-Fi (IEEE 802.11a/b/g), Bluetooth (IEEE 802.15) • In the Fourth-generation (4G) wireless network • Multiple broadband wireless access • Seamless mobility across heterogeneous networks WWAN: large coverage, high cost WLAN: high speed, moderate cost WPAN: small area, low speed, low cost (HPi)

  4. Wi-Fi WiMax Bluetooth Satellite Celluar Motivation • RAN Discovery • Discover available access networks • Scan a wide range of frequencies • Power management • RAN selection • Determine the optimal access network among available RANs • Many selection parameters • User’s network preference • Communication charge • Available bandwidth • Power dissipation

  5. Previous Works • Centralized approaches • A centralized server collects and monitors available RANs • A centralized server manages a mobile host’s position (GPS) • BAN (Basic Access Network)-based scheme • WISE (Wise Interface Selection) • Decentralized approaches • A mobile host itself monitors available RANs • PPM (Power and Performance Management) • NAV (Network Allocation Vector)-based scheme

  6. Decentralized Approaches • RAN discovery • Periodically turns on NICs (Network Interface Card) • Static or Dynamic period • All NIC or a CAN (Candidate Access Network) • RAN selection • QoS guarantee • Signal strength is increasing • Minimum power consumption • Select before a handoff occurs • Handoff occurs when QoS does not guarantee

  7. {network’s coverage} {mobile host’s velocity} How to discover available RANs • Static/Dynamic period • Static period ∝ {network’s coverage} • Dynamic period ∝ • {mobile host’s velocity} ≈ {∆signal strength} • CAN (Candidate Access Network) • Pre-select the optimal RAN among available RAN as a CAN • Periodically check that a selected CAN guarantees QoS

  8. How to select the optimal RAN

  9. Objective • Evaluate the performance of the following RAN selection schemes • Static period with a CAN • Dynamic period with a CAN • Static period without a CAN • Dynamic period without a CAN • Continuously active scheme • Performance Metrics • Achieved bandwidth • Number of handovers • Power consumption per seconds

  10. 2.4Mbps Signal is Good~! 1.2Mbps Signal is not good~! Evaluation Environments BS BS AP NS2’s mobility generator AP BS BS AP 0Mbps Signal is bad~!

  11. Configuration • Mobile node • 100 nodes, maximum 11m/s (≒ 40km/h) • Equipped with all types of network interfaces • Network characteristics Type Coverage (Km) Bandwidth (Mbps) Power Consumption Receive (J/Mbits) Transmit (J/Mbits) Idle (W) Off (W) ON (W) CDMA1X 2.5 2.4 0.206 1.169 0.082 - - 802.16 1 5 (0.13) (0.264) (0.2) - - 802.11a 0.4 54 0.035 0.022 1 - - 802.11b 0.4 11 0.123 0.205 0.75 1.7(1ms) 2.3(0.3s) 802.11g 0.4 54 0.026 0.037 0.75 - -

  12. Network Topologies • Insufficient network resource (b) Sufficient network resource

  13. Performance Analysis (1/3) Achieved bandwidth • Insufficient network resource (b) Sufficient network resource

  14. Performance Analysis (2/3) QoS degradation Number of handovers • Insufficient network resource (b) Sufficient network resource

  15. Performance Analysis (3/3) Power consumption per Sec 4.5 ~ 40% of a continuously active • Insufficient network resource (b) Sufficient network resource

  16. Observations and Analysis • Four selection schemes show the same achieved bandwidth • Dynamic or a CAN give large energy-saving • But, when bandwidth is sufficient • Static/dynamic with a CAN trigger too many handovers • But, when bandwidth is not sufficient • Static with a CAN consumes more power than Dynamic without a CAN

  17. Conclusion • Evaluated decentralized approaches for RAN selection • Implemented a simulator for wireless overlay network environment • Dynamic with a CAN reduces large amount of power consumption without degrading achieved bandwidth • But, too many handovers occur when bandwidth is sufficient

  18. Network Topologies • Insufficient network resource (b) Sufficient network resource CDMA1X (4) CDMA1X (4) 802.11g (10) 802.11g (26) 802.16 (20) 802.16 (10) 96 65 802.11a (10) 802.11b (31) 802.11a (21) 802.11b (25)

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