ISO/IEC 24730-22:2012 PDF

Information technology — Real time locating systems (RTLS) — Part 22: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol: Transmitters operating with multiple spread codes and employing a QPSK data encoding and Walsh offset QPSK (WOQPSK) spreading scheme

First page of standard ISO/IEC 24730-22:2012

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Title (English):

ISO/IEC 24730-22:2012

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 19
Publication date:: May 31, 2012
Edition:: ISO/IEC IS 24730 edition 1 version 1
ICS:: 35.040

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Description (English):

ISO/IEC 24730-2 is comprised of a main document and two additional parts, ISO/IEC 24730-21 and ISO/IEC 24730-22, and defines a networked location system that provides X-Y coordinates and data telemetry. The system utilizes real-time locating systems (RTLS) transmitters that autonomously generate a direct sequence spread spectrum radio frequency beacon. These devices can be field programmable and support an optional exciter mode that allows modification of the rate of location update and location of the RTLS device. ISO/IEC 24730-2 defines these modes, but does not define the means by which they are accomplished. ISO/IEC 24730-22:2012 is the mode of ISO/IEC 24730-2 transmitters operating with multiple spread codes and employing a quadrature phase shift keying (QPSK) data encoding and Walsh offset QPSK (WOQPSK) spreading scheme.

Technical details

Technical committee: ISO/IEC JTC 1/SC 31 - Automatic identification and data capture techniques
SKU: ISO/IEC 24730-22:2012

Abstract

Overview

ISO/IEC 24730-22:2012 specifies the DSSS 2.4 GHz air interface protocol for real-time locating systems (RTLS) transmitters that operate with multiple spread codes and use QPSK data encoding combined with a Walsh Offset QPSK (WOQPSK) spreading scheme. It is a companion part to ISO/IEC 24730-2 and ISO/IEC 24730-21 and defines the physical layer and mandatory air-interface behaviors needed for interoperable RTLS deployments in the 2 400–2 483.5 MHz band.

Key topics and technical requirements

Air interface and modulation
- Direct Sequence Spread Spectrum (DSSS) at 2.4 GHz.
- Quadrature Phase Shift Keying (QPSK) for data encoding.
- Walsh Offset QPSK (WOQPSK) spreading with support for multiple spread codes.
Frequency and RF parameters
- Operating band: 2400 MHz–2483.50 MHz (international 2.4 GHz ISM band).
- Centre frequency: 2441.75 MHz; occupied channel bandwidth: 60 MHz.
- Transmit power classes - Class 1 limited to 10 dBm EIRP (coexistence with IEEE 802.11 and ISO/IEC 18000-4).
Performance and compliance
- RTLS transmitters and reference tags must autonomously generate DSSS beacons.
- Minimum open‑field reception range: ≥ 300 m LOS under specified parameters.
- Nominal location accuracy: 3 m or better radius.
- Receivers must handle at least 120 beacon transmissions per second.
- Operating temperature range defined (–30 °C to 50 °C) for physical parameters.
Identification and protocol
- Manufacturer tag ID: 16-bit allocation aligned with ISO/IEC 15963.
- Defines reader synchronization methods needed for timing-based location methods (e.g., TDoA).
Normative references
- Works with ISO/IEC 24730-1 (API) and ISO/IEC 24730-2 (main DSSS spec), plus ISO/IEC 18000-4, ISO/IEC 8802-11, ISO/IEC 15963, and IEEE Std 1451.7.

Practical applications and who uses this standard

ISO/IEC 24730-22 is intended for:

RTLS equipment manufacturers (tags, readers) implementing DSSS QPSK/WOQPSK physical layers.
System integrators and solution providers building asset-tracking, logistics, warehousing, healthcare, airport, and campus RTLS solutions.
Network architects and RF engineers ensuring coexistence with Wi‑Fi and regulatory compliance in the 2.4 GHz band.
Software developers implementing RTLS server/APIs in accordance with ISO/IEC 24730-1.
Use cases: high-update-rate location tracking, TDoA timing-based positioning, telemetry from battery-powered tags, and environments requiring multiple orthogonal spread codes for capacity and interference resilience.

Related standards

ISO/IEC 24730-2 (DSSS main document)
ISO/IEC 24730-21 (single spread code, DBPSK/BPSK)
ISO/IEC 24730-1 (API)
ISO/IEC 18000-4, ISO/IEC 15963, ISO/IEC 8802-11 (802.11), IEEE Std 1451.7

Keywords: ISO/IEC 24730-22, RTLS, DSSS 2.4 GHz, QPSK, WOQPSK, air interface protocol, multiple spread codes, TDoA, real-time locating systems.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Air interface and modulation
- Direct Sequence Spread Spectrum (DSSS) at 2.4 GHz.
- Quadrature Phase Shift Keying (QPSK) for data encoding.
- Walsh Offset QPSK (WOQPSK) spreading with support for multiple spread codes.
Frequency and RF parameters
- Operating band: 2400 MHz–2483.50 MHz (international 2.4 GHz ISM band).
- Centre frequency: 2441.75 MHz; occupied channel bandwidth: 60 MHz.
- Transmit power classes - Class 1 limited to 10 dBm EIRP (coexistence with IEEE 802.11 and ISO/IEC 18000-4).
Performance and compliance
- RTLS transmitters and reference tags must autonomously generate DSSS beacons.
- Minimum open‑field reception range: ≥ 300 m LOS under specified parameters.
- Nominal location accuracy: 3 m or better radius.
- Receivers must handle at least 120 beacon transmissions per second.
- Operating temperature range defined (–30 °C to 50 °C) for physical parameters.
Identification and protocol
- Manufacturer tag ID: 16-bit allocation aligned with ISO/IEC 15963.
- Defines reader synchronization methods needed for timing-based location methods (e.g., TDoA).
Normative references
- Works with ISO/IEC 24730-1 (API) and ISO/IEC 24730-2 (main DSSS spec), plus ISO/IEC 18000-4, ISO/IEC 8802-11, ISO/IEC 15963, and IEEE Std 1451.7.

Practical applications and who uses this standard

ISO/IEC 24730-22 is intended for:

RTLS equipment manufacturers (tags, readers) implementing DSSS QPSK/WOQPSK physical layers.
System integrators and solution providers building asset-tracking, logistics, warehousing, healthcare, airport, and campus RTLS solutions.
Network architects and RF engineers ensuring coexistence with Wi‑Fi and regulatory compliance in the 2.4 GHz band.
Software developers implementing RTLS server/APIs in accordance with ISO/IEC 24730-1.
Use cases: high-update-rate location tracking, TDoA timing-based positioning, telemetry from battery-powered tags, and environments requiring multiple orthogonal spread codes for capacity and interference resilience.

Related standards

ISO/IEC 24730-2 (DSSS main document)
ISO/IEC 24730-21 (single spread code, DBPSK/BPSK)
ISO/IEC 24730-1 (API)
ISO/IEC 18000-4, ISO/IEC 15963, ISO/IEC 8802-11 (802.11), IEEE Std 1451.7

Keywords: ISO/IEC 24730-22, RTLS, DSSS 2.4 GHz, QPSK, WOQPSK, air interface protocol, multiple spread codes, TDoA, real-time locating systems.

ISO/IEC 24730-22:2012 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications and who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications and who uses this standard

Related standards

Related standards

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