Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)

1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: TG4a ECC TG3 regulatory Requirements for UWB Low Duty Cycle (LDC) Date Submitted: November 9, 2005 Source: Christian Politano, Gian Mario Maggio & Philippe Rouzet (STMicroelectronics) Contact: Gian Mario Maggio Voice: +41-22-929-6917, E-Mail: gian-mario.maggio@st.com Abstract: Low Duty Cycle mitigation techniques under discussion at ECC TG3 Purpose: To provide information on the Low Duty Cycle requirements under discussion at ECC TG3, and submit these requirements for further investigation. Notice: This document has been prepared to assist the IEEE P802.15. 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 P802.15. C. Politano, G.M. Maggio & P. Rouzet (STM)

2. ECC TG3 Regulatory requirementsfor UWB Low Duty Cycle (UWB LDC) C. Politano, G.M. Maggio & P. Rouzet (STM)

3. ECC TG3 Regulatory limitations for UWB Low Duty Cycle (LDC)Introduction • Purpose of the document: • Introduce on-going ECC TG3 discussions in defining regulatory requirements for Low Duty Cycle UWB devices targeting low data rate and Location / Tracking UWB applications. • Propose areas of investigations for IEEE 802.15.4a TG, in order to investigate the impact of these ECC TG3 regulatory requirements on the PHY-MAC. • Objectives of ECC TG3 regulatory limitations for LDC UWB devices • Reduce aggregated UWB interferences for UWB coexistence with radiocommunication services in Indoor environment for Low Data rate and Location/Tracking UWB devices operating at an emission level of -41.3 dBm/MHz • Targeted indoor victim services: WiMax C. Politano, G.M. Maggio & P. Rouzet (STM)

4. ECC TG3 Regulatory limitations for UWB Low Duty Cycle (LDC)WiMax Characteristics to be considered • Results from current compatibility studies • For UWB coexistence scenario with WiMax client transceivers in Indoor environment, the UWB interferer impact is proven: the UWB interferences level during “Ton” are affecting FWA frames. • Regulation limitations are defined according to current IEEE 802.16 standard • and not limited on present WiMAX profiles, which are only a subset for the initial priorities; WiMAX shall be left free to later define different additional profiles within 802.16 flexibility. • WiMax characteristics impacting LDC UWB regulatory limitations: • WiMax frame lengths: The 802.16 standard specification gives frame lengths between 2 to 20 msec • WiMax Protection criteria: The 802.16 standard specifies that no more than 2 consecutive frames should be affected by interferers. • BLER of 0.5% over a long transmission period for WiMax system Under investigation C. Politano, G.M. Maggio & P. Rouzet (STM)

5. ECC TG3 Regulatory limitations for UWB Low Duty Cycle (LDC)UWB Characteristics impacted (1/2) • PRF considerations and limitations seem unessential. • The main characteristics are the “Ton” defined as UWB burst duration and the “Toff” defined as interval between two “Ton” without any UWB emission • “Ton”: is defined as the maximum duration in order not to affect two consecutive WiMax frames with minimum duration. The minimum WiMax frame duration is 2msec. • With this criteria, the maximum “Ton” shall be 2msec • “Toff”: is the minimum duration for a single UWB link in order not to affect two consecutive WiMax frames with maximum duration. The maximum Wimax frame duration is 20 msec; • With this criteria, for one single UWB link, the minimum “Toff” shall be 30 msec (1.5 times the longer frame length) Under investigation C. Politano, G.M. Maggio & P. Rouzet (STM)

6. ECC TG3 Regulatory limitations for UWB Low Duty Cycle (LDC)UWB Characteristics impacted (2/2) • UWB piconet consideration: The “Toff” defined above should be considered for one single UWB link, when in a typical piconet several links are possible. • In order to take into account multiple UWB links in a piconet, a safeguard margin of 7 times the single UWB “Toff” is envisaged. • With this criteria, for UWB piconet configuration, the single UWB “Toff” shall be increased to 210 msec Under investigation C. Politano, G.M. Maggio & P. Rouzet (STM)

7. ECC TG3 Regulatory limitations for Low Duty Cycle UWB (LDC UWB)Summary on UWB characteristics impact • Low Duty Cycle UWB characteristics to be considered and investigated: • PRF----> arbitraryBurst duration (Ton) ----> <2mSBurst interval single device (Toff) -----> >210mS (Burst frequency <5 Hz)Burst interval within a UWB piconet----> >30mSThe above will result in the following Activity Factor:1%/Sec (for single UWB)6.6%/Sec (for a piconet)0.5%/hour (for single UWB) Under investigation C. Politano, G.M. Maggio & P. Rouzet (STM)

8. UWB Low Duty Cycle based on WiMax Frames« Ton » = Maximum Burst duration • Maximum Burst Duration (MBD): “Ton” • Criteria; UWB MBD has to be smaller than minimum WiMax frame duration (802.16gives 2 to 20 msec frame lengths) in order not to affect more than 2 consecutive frames • Actions: Evaluate minimal WiMax frame durations (typical value?, 4 or 5, or more msec?) • Proposals: LDC UWB burst durations should allow several messages transmissions, and typical LDC UWB burst durations should also be investigated according to LDC UWB applications Minimum Wimax Frame duration: [2] msec Continuous Frames transmission Under investigation WiMax Frames “Ton” = MBD = [2] msec UWB bursts Time C. Politano, G.M. Maggio & P. Rouzet (STM)

9. UWB Low Duty Cycle based on WiMax Frames« Toff » = Minimum instantaneous Burst Period (MBP) • Minimum instantaneous Burst repetition Period (MBP_instantaneous) over 1 second: MBP equivalent to “Toff” • “Toff” or MBP=30msec: UWB MBD for a single UWB link has to be bigger than the maximum Wimax frame length (20msec) in order not to affect more than 2 consecutive frames = 1/1.5*0.02 = 33.3 Hz • Safeguard for UWB piconet; 7 times => MBP= 210 msec: 5 Hz maximum Burst repetition Frequency • Actions; clarification of the protection criteria to apply to WiMax Maximum Wimax Frame duration: 20 msec Continuous Frames transmission Under investigation WiMax Frames MBP_instantaneous: 30 or 200 msec (in this slide we consider MBP equivalent to “Toff” “Toff” UWB bursts 0 1 Sec C. Politano, G.M. Maggio & P. Rouzet (STM)

10. UWB Low Duty Cycle based on WiMax FramesMinimum average Burst period (MBP) over 1 Hour • Minimum average Burst repetition Period (MBP_average) over 1 hour: • Criteria: BLER of 0.5% over a long transmission period for WiMax system • Maximum burst repetition frequency (average) over 1 Hour: 1 Hz • Minimum Burst repetition Period (MBP_average) over 1 Hour: 1 sec Wimax Frame duration Continuous Frames transmission Under investigation WiMax Frames MBP_average = 1 sec UWB bursts 0 1 Hour C. Politano, G.M. Maggio & P. Rouzet (STM)