1. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: [IEEE 802.15.4 Status] Date Submitted: [November, 2001] Source: [Ed Callaway] Company: [Motorola] Address: [8000 W. Sunrise Blvd., M/S 2141, Plantation, FL 33322] Voice:[(954) 723-8341], FAX: [(954) 723-3712], E-Mail:[ed.callaway@motorola.com] Re: [] Abstract:[This presentation describes the status of the IEEE 802.15.4 standard, with emphasis on coexistence features.] Purpose:[Description of 802.15.4 status to 802 COEX.] 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.

2. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola IEEE 802.15.4 Status Ed Callaway Florida Communication Research Lab Motorola Labs ed.callaway@motorola.com

3. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola Now in Development … A low-rate wireless personal area network communications protocol that: -Supports multiple network types, -Has long battery life (months or years from a AAA cell) -Is low cost … for systems with moderate data throughput (< 250 kb/s) and QoS requirements.

4. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola MAC Features Supports star & peer-peer topologies –Master/slave, point to any point, cluster tree, etc. Access is slotted CSMA-CA Raw data rates of 250 kb/s at 2.4 GHz, lower at 868 and 915 MHz Optional use of network beacons Optional time slots for low latency transfer Super-frame is contention based

5. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola Node Types Distribution node Controls the network topology at that node Master/coordinator or mediation device Stores routing information Talks to other distribution and slave nodes Slave node Cannot control the network Very simple implementation Does not store routing information Talks only to a distribution node

6. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola Optional Super Frame Structure 15ms Network beacon Contention period Beacon extension period Slot 3Slot 2Slot 1 Allocated slot Transmitted by distribution nodes. Contains network information, super frame structure and notification of pending node messages. Space reserved for beacon growth due to pending node messages Access by any node using CSMA-CA Reserved for nodes requiring guaranteed bandwidth.

7. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola Master/Slave: Network Connection CONNECT ACK CONNECT-CONF ACK BEACON PERMIT-CONNECTION CONNECT-CONFNEW-DEVICE SlaveMaster Rx Tx

8. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola Mediation Device Operation Source Node MD Destination Node RTS RTS Reply Query Query Response CTS DATA ACK Timing adjustment Rx slot Tx slot … Solves synchronization problem for low cost, low duty cycle peer-peer systems

9. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola PHY Features 250 kb/s operation at 2.4 GHz DSSS with low chip rate (1 MHz) for low power operation O-QPSK, for constant envelope modulation Simple, low-cost PA Orthogonal coding Greater range for a given output power 5 MHz channel separation 16 channels in the 2.4 GHz band 5 channels in the U.S. 915 MHz band 1 channel (at lower data rates) in the European 866 MHz band Eases channel filter requirements to lower die size & cost

10. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola Principle of Code Phase Shift Keying I Q … c n+1 c 30 c0c0 …c n-2 Symbol 0000 … c n+2 c 31 c1c1 c n+3 …c n-1 Preamble … c 30 c 28 …c 31 c 29 cncn c0c0 c1c1 c m+2 cmcm c m+1 c m+3 Symbol 0001 … … The starting position of a single pn sequence is modulated with the transmitted data Multiple bits may be sent in a single symbol time  better battery life

11. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola Coexistence Features Designed for ultra-low duty cycle operation: < 0.1% to 1% –Node transmitters off more than 99% of the time network is in operation Multiple PHYs: 868, 915 MHz, 2.4 GHz Devices above 16 dBm must be capable of power reduction to below 4 dBm Designed for applications tolerant of message latency; multiple retries acceptable

12. doc.: IEEE 802.15-01/449r0 Submission November 2001 Ed Callaway, Motorola For Further Information The IEEE 802.15.4 web site: http://www.ieee802.org/15/pub/TG4.html