November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

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]

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.

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

IEEE 802.15.4 Status

Ed Callaway

Florida Communication Research Lab

Motorola Labs

ed.callaway@motorola.com

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

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.

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

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

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

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

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

Optional Super Frame Structure

15ms

Networkbeacon

Contentionperiod

Beaconextension

period

Slot 3 Slot 2 Slot 1

Allocatedslot

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.

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

Master/Slave: Network Connection

CONNECT

CONNECT

ACK

CONNECT-CONF

ACK

BEACONPERMIT-CONNECTION

CONNECT-CONFNEW-DEVICE

SlaveMaster

Rx

Tx

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

Mediation Device OperationSourceNode

MDDestination

Node

RTS

RTS Reply

Query

Query Response

CTS

DATA

ACK

Timingadjustment

Rx slot

Tx slot

… Solves synchronization problem for low cost, low duty cycle peer-peer systems

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

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

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

Principle of Code Phase Shift Keying

I

Q

…

cn+1

c30 c0 … cn-2

Symbol 0000

…

cn+2

c31 c1cn+3 … cn-1

Preamble

… c30c28

… c31c29

cnc0

c1

cm+2cm

cm+1 cm+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

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

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

November 2001

Ed Callaway, Motorola

doc.: IEEE 802.15-01/449r0

Submission

For Further Information

• The IEEE 802.15.4 web site: http://www.ieee802.org/15/pub/TG4.html