1199 doc IEEE 802 15 010063 r 0

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11/99 doc. : IEEE 802. 15 -01/0063 r 0 IEEE P 802. 15 Working

11/99 doc. : IEEE 802. 15 -01/0063 r 0 IEEE P 802. 15 Working Group for Wireless Personal Area Networks Power Control and Packet Scheduling for Bluetooth to Avoid 802. 11 Direct Sequence Interference Nada Golmie and Nicolas Chevrollier National Institute of Standards and Technology Gaithersburg, MD 20899 USA Submission 1 Nada Golmie, NIST

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Outline • Non - Collaborative

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Outline • Non - Collaborative technique to improve Bluetooth data traffic performance – Part I: Power control – Part II: Efficient frequency use • Simulation Experiment Setup – Topology, parameters and traffic model used • Results • Summary Submission 2 Nada Golmie, NIST

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Part I: Power Control •

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Part I: Power Control • Update the power of the transmitter, based on the receiver Carrier to Interference Ratio (CIR): where and , are the transmitted power during update intervals t+1 and t respectively, and is the CIR measured during interval t. Submission 3 Nada Golmie, NIST

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Part II: Frequency Use •

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Part II: Frequency Use • Construct a table of the available frequencies based on the BER measurement at the receiver. • Master checks both its available frequencies and the slave’s available frequencies before sending a packet to the slave. Frequency Offset 0 1 . . . 78 Master BER Master Available Freq. Slave Available Freq. 10^-2 < 0 0 10^-2 < 0 1 Master Frequency Use Table Submission 1 < 10^-3 1 Slave Sends to Master Updates on its Available Receive Frequencies 4 Nada Golmie, NIST

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Simulation Parameters 300 packets 30

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Simulation Parameters 300 packets 30 seconds Bluetooth Parameters WLAN Parameters DM 1 Packet Interarrival Time 1. 25 ms Packet Interarrival Time 50% Load Transmitted Power 1 m. W Transmitted Power AP Coordinates (Sink) Slave Coordinates (0, 0) Master Coordinates (1, 0) Mobile Coordinates (Source) DM 1 Packet Interarrival Time 2. 91 ms Packet Header Slot Time 30% Load Update Interval Length of Simulation Run Submission 1. 86 ms 50% 25 m. W (0, 15) (0, d) 224 bits 20 us SIFS 10 us DIFS CW_min 50 us CW_max RTS 1023 None 5 31 Nada Golmie, NIST

1/01 Submission Topology 6 doc. : IEEE 802. 15 -01/0063 r 0 Nada Golmie,

1/01 Submission Topology 6 doc. : IEEE 802. 15 -01/0063 r 0 Nada Golmie, NIST

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Traffic Model Submission 7 Nada

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Traffic Model Submission 7 Nada Golmie, NIST

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Performance Measurements • Measurements are

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Performance Measurements • Measurements are performed at the Baseband: – Probability of packet loss – Normalized and mean access delay – Bluetooth transmitted power Submission 8 Nada Golmie, NIST

1/01 Error Occurrences and Packet Acceptance Decisions Error Location Access Code Packet Header DM

1/01 Error Occurrences and Packet Acceptance Decisions Error Location Access Code Packet Header DM 1 payload Submission doc. : IEEE 802. 15 -01/0063 r 0 Error Correction Hamming distance, d=14 1/3 FEC 2/3 FEC 9 Action Taken Drop Nada Golmie, NIST

1/01 Submission doc. : IEEE 802. 15 -01/0063 r 0 Packet Loss at Bluetooth

1/01 Submission doc. : IEEE 802. 15 -01/0063 r 0 Packet Loss at Bluetooth Slave 10 Nada Golmie, NIST

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Bluetooth Master Power Transmitted Submission

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Bluetooth Master Power Transmitted Submission 11 Nada Golmie, NIST

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Mean Access Delay for Bluetooth

1/01 doc. : IEEE 802. 15 -01/0063 r 0 Mean Access Delay for Bluetooth Slave Submission 12 Nada Golmie, NIST

1/01 Submission doc. : IEEE 802. 15 -01/0063 r 0 Normalized Mean Access Delay

1/01 Submission doc. : IEEE 802. 15 -01/0063 r 0 Normalized Mean Access Delay for Bluetooth Slave 13 Nada Golmie, NIST

1/01 Conclusions doc. : IEEE 802. 15 -01/0063 r 0 • Simple non-collaborative techniques

1/01 Conclusions doc. : IEEE 802. 15 -01/0063 r 0 • Simple non-collaborative techniques can improve the performance of Bluetooth and IEEE 802. 11: – control of Bluetooth transmitted power has limited advantage (decreases packet loss for interference distance > 1 m) but at the cost of increasing the interference on the other devices. – scheduling of Bluetooth LAN traffic to use noninterfering frequencies (available) eliminates packet loss and increases access delay by ~ 625 us. Submission 14 Nada Golmie, NIST

1/01 Future Work doc. : IEEE 802. 15 -01/0063 r 0 • Evaluate the

1/01 Future Work doc. : IEEE 802. 15 -01/0063 r 0 • Evaluate the same technique for other DM packet sizes. • Devise other techniques to deal with Bluetooth voice traffic, WLAN Frequency hopping systems. Submission 15 Nada Golmie, NIST