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

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]

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

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  1. 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. Ed Callaway, Motorola

  2. IEEE 802.15.4 Status Ed Callaway Florida Communication Research Lab Motorola Labs ed.callaway@motorola.com Ed Callaway, Motorola

  3. 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. Ed Callaway, Motorola

  4. 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 Ed Callaway, Motorola

  5. 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 Ed Callaway, Motorola

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

  7. Master/Slave: Network Connection Master Slave CONNECT PERMIT-CONNECTION BEACON CONNECT Tx ACK Rx CONNECT-CONF ACK NEW-DEVICE CONNECT-CONF Ed Callaway, Motorola

  8. Mediation Device Operation Source Node MD Destination Node Query Tx slot RTS Rx slot RTS Reply Query Response Timing adjustment CTS DATA ACK … Solves synchronization problem for low cost, low duty cycle peer-peer systems Ed Callaway, Motorola

  9. 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 Ed Callaway, Motorola

  10. Preamble Symbol 0001 Symbol 0000 c0 … c30 c0 cn-2 … cn cm+2 … c28 cm c30 cn+2 … I … c31 c1 cn+3 cm+1 cn+1 … cn-1 cm+3 c29 c1 … c31 … Q Principle of Code Phase Shift Keying • 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 Ed Callaway, Motorola

  11. 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 Ed Callaway, Motorola

  12. For Further Information • The IEEE 802.15.4 web site: http://www.ieee802.org/15/pub/TG4.html Ed Callaway, Motorola

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