March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a1 Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [DAA framework for UWB] Date Submitted: [March, 2006] Source: [Bin Zhen, Huan-Bang Li and Ryuji Kohno; Company: National Institute of Information and Communications Technology ] Contact: Bin Zhen Voice: , Abstract: [DAA framework.] Purpose: [UWB DAA support] Notice:This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a2 DAA framework for UWB by Bin Zhen, Huan-bang Li and Ryuji Kohno

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a3 Agenda for discussion in DOC a 1.Regulatory issues (1) Necessity of Interference reduction technology, e.g. DAA (2) Introduction and discussion of feasible DAA Doc a (This Doc.) (3) Summary of issues in DAA for regulatory compliance 2. Coexistence issues (1) Category of coexistence problem (2) Solution for regulatory requirement, i.e. simple DAA, LDC (3) Definition of LDC: necessary duty cycle in node & PCN etc Doc a (Next Doc.) Regulatory requirement is to ensure coexistence by reasonable interference reduction technology, e.g. DAA, LDC.

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a4 Feasible DAA with Detect in PHY and Avoid in MAC in DOC a PNC node band allocation (b 1,b 2, or b 3 ) PNC node band allocation (b 2 or b 3 ) b1b1 b2b2 b3b3 victim system frequency PNC should support a detection (e.g., energy) functionality. victim system interference Channel b 1 is not assigned. no interference with DAAwithout DAA Without DAA, the UWB and victim system will interfere with each other. The ranging mode of UWB requesting high SINR.

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a5 DAA in a  15.4a defined basic request/report mechanism to provide a DAA tunnel ( , Joe Decuir and , Kohno, Hara, & Takizawa) –Interference measurement is only mandatory for FFD –Interference information communication between FFD and coordinator –Interference avoid command from coordinator  Victim detection mechanism (as per h) –Energy detection –Receive power indication histogram –CCA  Not consider the difference between 4a and 11h

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a6 Framework of DAA  Distributed sensing –Only FFD is required to conduct detection –Multiple clusters with FFD’s in a Piconet  Centralized decision at coordinator PAN coordinator FFD, cluster header RFD, device Cluster 1 Cluster 2 Cluster 3 Victim report Avoidance command PICONET

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a7 Geometry of DAA Victim receiver keep-out range sensing border Victim transmitter d Protection range interference range UWB transmitter

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a8 Geometry of DAA (cont.)  Protection range –where victim signal is much stronger than the noise interference introduced by UWB  Interference range –where victim signal is comparable with the noise interference introduced by UWB and some performance decrease can be find  Keep-out range –where severe victim performance decrease can be find

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a9 Implications to DAA sensing  The UWB interference depends on distance between victim transmitter and receiver –No problem if victim receiver is in victim dominated range –UWB transmitter should be out of the keep-out range –DAA sensing range should be larger than keep-out range  Victim-dependent range size  At least two-looks for transmission from transmitter and receiver –it is hard for simple sensor to separate them without decoding the packets

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a10 Detection dependent upon victim type  Classification of victim systems: from modulation –DS style 3a-like MBOA, 3a-like DS-UWB and 4a –OFDM style 3a-like MBOA, WiMax (16a), and Japan 4G –Radar?  Classification of victim systems: from bandwidth –UWB –Narrow band

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a11 Key issues in DAA sensing  You cannot see the full victim signal –Intersected and versatile channel bands –Feature based sensing cannot be used. Only energy based sensing is possible  Different channel busy patterns –Transient pulse energy filled with noise (<0.1 μs) –Symbol duration of channel busy time (100 μs)  Simple sensor nodes –Computing capacity, complexity, cost, power consumption  Almost no time limitation

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a12 Key issues in DAA sensing (cont.) Partially overlapped channels Channel state pattern MBOA (4488MHz, 528MHz) 4a (4446Mhz, 499.2MHz) f 16a (10/20 MHz) t 4a (<0.1μs) 16a (>10μs, OFDM) MBOA (~0.3μs, FH)

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a13 Expected DAA performance  DAA increases probability of interference among 4a piconets due to less available channels  Distributed DAA sensing –P d =0.9 with P fa =0.1 of a FFD the pionet detection probability is 0.9, 0.99, 0.999,… when there are 1, 2, 3, … FFD in the piconet;

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a14 DAA sensing mechanism  Split a 4a channel into sub-bands –4a channels and victim channels are not full overlapped –Noise signal could dominate channel energy for a narrow band system, especially in low SNR environment. Given 500MHz filter for a 20MHz signal, the noise level increase 14dB  Separated band-pass filter bank –10MHz BPF bank for narrow band victims –100MHz BPF bank for UWB victims

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a15 DAA sensing mechanism (cont.)  Victim dependent energy detection in both time and frequency domain –Time pattern of energy detection Frequency hopping MBOA –Post-processing Average, integration, etc.  Step-by-step sensing –Victim, sub-band

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a16 Block diagram of DAA Matched filerDe-spreader Communication & ranging 500MHz BPF 10MHz tunable BPF Energy Detection DAA decision 500MHz BPF (detected channel) Post- processing 100MHz tunable BPF

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a17 DAA sensing performance  Impact factors of sensing –Filter bank Filter bandwidth Filter center frequency Distribution of filter –Detection duration –Multipath channel –SNR  Central decision –Sub-band state decision at FFD –Merge algorithm at coordinator

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a18 Extension of basic request/report  Basic request –inform victim style  Basic report –Split a channel into sub-bands –Report busy probability of each sub-band The same channel energy could indicate different states –Channel energy report is a big traffic More than one victim systems in the same channel, e.g. 16a and MBOA.

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a19 New basic request/report format Channel number Measurement duration Basic request Channel number Channel energy Basic report Map field DS- UWB Narrow-band OFDM Radar signal Channel number Sub-channel number Un- measured Busy probability ( from Joe.) Channel number Measurement duration Victim style MBOA -UWB

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a20 TBD parameters  Busy sub-band sensing –Energy threshold –Time pattern  Optimal filter bank –Center frequency –Filter bandwidth –Filter distribution and density

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a21 Summary  Framework of distributed UWB DAA sensing –DS-UWB style and OFDM style  Split a 4a channel into sub-bands for DAA sensing –100MHz for UWB victims –10MHz for narrow band victims  Extension of basic request/report –Busy probability of sub-band  Simple DAA can be accomplished in a sensor node

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a22 Annex 1: UWB victim systems  a –OFDM receiver threshold: -90 dBm –Unlicensed channel: 10/20 MHz, 256 bands –Downlink pilot: 0xfff  MBOA –Mult-band OFDM receiver threshold: -80 dBm –Channel: 528MHz, 122 bands –Preamble: ….  DS-UWB –3a-like receiver threshold: -90 dBm Channel: 3.1~4.9 GHz Preamble: …..  Japan 4G:

March, 2006 Doc: IEEE a Zhen, Li, and Kohno (NICT) SlideTG4a23 Annex 2: DAA in UWB and spectrum sensing in  : a developing cognitive radio- based PHY/MAC standard in TV channels –Existing and narrow band systems –No channel intersection issue –Not handhold device and sensor