doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: Two rate DSSS for SUN Date Submitted: 2 May, 2009 Source: Tae-Joon Park, Wun-Cheol Jeong, Hoyong Kang, Seong-Soon Joo Company: ETRI Address: 161 Gajeong-dong, Yuseong-gu, Daejeon, KOREA Voice: +82-42-860-6333, FAX: +82-42-860-4197, E-Mail: ssjoo@etri.re.kr Re: Abstract: . Purpose: To support the task group forming for the neighborhood area network 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. <author>, <company>

doc.: IEEE 802.15-<doc#> <month year> doc.: IEEE 802.15-<doc#> Two Rate DSSS for SUN Tae-Joon Park, Wun-Cheol Jeong, Hoyong Kang, Seong-Soon Joo* ETRI <author>, <company>

What do we want to TG4g-SUN ? Simple & compatible with IEEE 802.15.4 Minimal modification coexistence with IEEE802.15.4 based networks Two rate options Basic Rate (below 250 Kbps) IEEE802.15.4 compatible (Below 127 Bytes long) DSSS PHY O-QPSK Extended Rate (over 250 Kbps and below 750Kbps) Minimize a change Reducing the spreading gain

1. Basic Rate Below 250 Kbps For the case of 127 Bytes long or under, it can support backward compatibility on the condition that; Normally CRC-16, Optionally CRC-32 Symbol-to-chip mapping table is the same as that of IEEE802.15.4-2006 915 MHz O-QPSK PHY Specification provides The commercial deployment has been delayed since the technology for this application has not yet been decided upon.

2. Extended Rate Over 250 Kbps and below 750Kbps Minimizing the modification to the IEEE802.15.4 Reducing the spreading gain Data symbol (Binary) b0 b1 b2 p Chip Values c0 c1 c2 c3 -1 +1

What we want to TG4g-SUN is… IEEE 802.15.4 is already verified in the market. But it has some limitations to use in various applications. TG4g-SUN may make up for the weak points of it. We tried to think the matter over carefully, and made a proposal with simple and minimal modification