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Proposed Resolution for Low-Power Wake-Up Radio Comment S6-485

Discussion on enhancing the compatibility of low-power wake-up radios in TG6 draft D01 by adding detailed information for consistent functionality within the MAC proposal.

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Proposed Resolution for Low-Power Wake-Up Radio Comment S6-485

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  1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [Resolution of TG6 comment: S6-485] Date Submitted: [06 September, 2010] Source: [Yan Zhang, GeorgiosSelimis and Guido Dolmans] Company [IMEC-NL] Address [IMEC the Netherlands High Tech Campus 31, 5656 AE Eindhoven, The Netherlands] Voice:[+31 40 277 4000], FAX: [+31 40 274 6400 E-Mail:[Yan.Zhang@imec-nl.nl] Re: Proposed Resolution of D0 MAC Comment S6-485. Abstract: Proposed resolution for comments: S6-485. Purpose: This document is for the MAC comment resolution discussion for TG6 draft D01. 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. <IMEC The Netherlands>

  2. Proposed Resolution of D0 Comment S6-485 Comments relative to low power wake-up radio bit (6.6.2 PHY Capability). <IMEC The Netherlands>

  3. D0 Comment S6-485 • 6.6.2 PHY Capability • Comment: Currently, there is only one bit which is linked with low power wake up radio in Figure 37 of MAC proposal (PHY Capability format). • Proposed Change: More details are to be filled in for the low power radio bit. Otherwise wakeup radios will not be compatible; wakeup radio will not be able to wake up the node. <IMEC The Netherlands>

  4. Analysis: The low power wake up radio functionality has been indicated with one bit in the PHY capability format. However, there is no other information regarding this. Featured by ultra-low power channel monitoring, it is important for the BAN radio to facilitate this functionality. To make this functionality consistent to the other rest of the MAC proposal, a control frame structure and a mode shift IE (between the normal mode and the low power wake up radio mode) are proposed in details. <IMEC The Netherlands>

  5. Proposed Resolution: Add to “Table 3 — Frame Type and Frame Subtype field encoding” p.31, the following row in order to support low power wake-up types Table 3 — Frame Type and Frame Subtype field encoding Since we added the Frame Subtype “Low power wake-up”, then we have to define its format. So, we add the 6.4.9 paragraph at the end of the “6.4 Control type frames” . Below is the text . 6.4.9 Duty cycle control can be applied to the main radio or with a separate low power wake-up radio, as specified in 6.6.2 PHY capability. For the out-of-band low power wake-up packet, the packet format is shown in Figure 1. Figure 1:Low power wake-up packet format • Flag bit is used to indicate if there is payload part included or not. • Optional payload part contains link configuration information of the main radio, such as PHY interface selection, modulation scheme, channel, coding rate. The payload of the wake-up packet is illustrated in Figure 2. Figure 2 Wake-up packet payload (narrowband) Continued on next page <IMEC The Netherlands>

  6. Band Index: the selected frequency band for the main radio communication Table 1 — Band Index Mapping (narrowband) • Channel index: is used to identify a certain channel in the selected frequency band. • Modulation scheme: the chosen modulation scheme Table 2 — Modulation Index Mapping (narrowband) Table 3 — Modulation Index Mapping (UWB) End of 6.4.9 <IMEC The Netherlands>

  7. In addition we add the following entry to Table 12 Table 12 — Information elements defined in this standard Insert 6.7.15: Low Power Wake-up Radio Mode Shift IE A low power wake-up radio mode shift IE is formatted as shown in Figure 3. It is optionally contained in the Connection Request frames to enable out-of-band low power wake-up radio mode. Figure 3 Low Power Wake-up Radio Mode Shift IE Format The 4-bit low power wake-up channel ID is used to indicate a certain channel that the low power wake-up radio is to dwell on. Table 6 — Low power wake-up cannel ID mapping <IMEC The Netherlands>

  8. Duty cycle indicator is used to inform the coordinator about the duty cycle control used by the low power wake-up radio. The low power wake-up radio can adopt continuous channel monitoring or follow the same duty cycle control as indicated by wakeup phase and wakeup period in the Connection Request frame 6.3.6. Table 7 — Duty cycle indicator <IMEC The Netherlands>

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