November 2001 doc IEEE 802 15 01449 r
November 2001 doc. : IEEE 802. 15 -01/449 r 0 Project: IEEE P 802. 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 P 802. 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 P 802. 15. Submission Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 IEEE 802. 15. 4 Status Ed Callaway Florida Communication Research Lab Motorola Labs ed. callaway@motorola. com Submission Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 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 Qo. S requirements. Submission Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 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 Submission Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 Node Types n Distribution node l l l n Controls the network topology at that node Master/coordinator or mediation device l Stores routing information Talks to other distribution and slave nodes Slave node l l l Cannot control the network Very simplementation l Does not store routing information Talks only to a distribution node Submission Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 Optional Super Frame Structure Slot 3 Slot 2 Slot 1 15 ms 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. Submission Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 Master/Slave: Network Connection Master Slave CONNECT PERMIT-CONNECTION BEACON CONNECT Tx ACK Rx CONNECT-CONF ACK NEW-DEVICE Submission CONNECT-CONF Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 Mediation Device Operation Source Node MD Destination Node Query Tx slot RTS Reply Query Response Timing adjustment CTS DATA ACK … Solves synchronization problem for low cost, low duty cycle peer-peer systems Submission Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 PHY Features n n n 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 l n Orthogonal coding l n Simple, low-cost PA Greater range for a given output power 5 MHz channel separation l l Submission 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
November 2001 doc. : IEEE 802. 15 -01/449 r 0 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 Preamble I Q c 0 … c 28 c 1 … c 29 Submission Symbol 0000 c 31 cn cn+2 cn+1 cn+3 … Symbol 0001 c 30 c 0 … cn-2 cm cm+2 … … c 31 c 1 … cn-1 cm+3 … Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 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 d. Bm must be capable of power reduction to below 4 d. Bm • Designed for applications tolerant of message latency; multiple retries acceptable Submission Ed Callaway, Motorola
November 2001 doc. : IEEE 802. 15 -01/449 r 0 For Further Information • The IEEE 802. 15. 4 web site: http: //www. ieee 802. org/15/pub/TG 4. html Submission Ed Callaway, Motorola
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