ISO IEC 24730-21-2012 PDF

Full title and description

Information technology — Real time locating systems (RTLS) — Part 21: Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol: Transmitters operating with a single spread code and employing a DBPSK data encoding and BPSK spreading scheme. This part specifies the DSSS 2.4 GHz air‑interface (physical layer) requirements for RTLS transmitters that use a single spread code and differential BPSK/BPSK modulation to support location beacons and telemetry.

Abstract

ISO/IEC 24730-21:2012 is one of the parts of the ISO/IEC 24730 RTLS family. The part defines the air‑interface protocol for transmitters that autonomously generate direct sequence spread spectrum (DSSS) beacons in the 2.4 GHz band, specifying the use of a single spread code together with differential binary phase shift keying (DBPSK) data encoding and binary phase shift keying (BPSK) spreading. The document supports interoperability of RTLS transmitters at the physical layer while the higher‑level location system behaviour is defined in the main part (24730‑2).

General information

• Status: Published (International Standard; confirmed at review).
• Publication date: 2012 — published May 31, 2012 / ISO listing June 2012 (Edition 1, 2012).
• Publisher: Joint ISO/IEC (ISO/IEC JTC 1/SC 31 - Automatic identification and data capture techniques).
• ICS / categories: 35.040.50 (Automatic identification and data capture techniques).
• Edition / version: Edition 1.0 (2012).
• Number of pages: 31 pages (published PDF length as catalogued).

Scope

This part (24730‑21) specifies the physical‑layer air interface for RTLS transmitters using DSSS in the 2.4 GHz ISM band where transmitters operate with a single spread code, using DBPSK for data encoding and BPSK for spreading. It is intended to enable interoperable beacon transmission for RTLS systems that implement the ISO/IEC 24730 family; it specifies waveform, modulation and timing/format details needed for radio‑level interoperability but does not redefine the higher‑level location system modes described in ISO/IEC 24730‑2.

Key topics and requirements

• Specification of DSSS 2.4 GHz air interface for RTLS transmitters.
• Single spread code operation model and associated timing/format constraints.
• Use of differential BPSK (DBPSK) for data encoding and BPSK for spreading.
• Physical‑layer packet framing, signalling and beacon transmission parameters required for interoperability.
• Normative requirements for transmitter behaviour to support the ISO/IEC 24730 RTLS architecture (PHY level only).

Typical use and users

Engineers and product teams developing RTLS tags/transmitters and radio modules; manufacturers of asset‑tracking and personnel‑tracking devices; test and certification labs verifying PHY conformance; system integrators implementing ISO/IEC 24730 family solutions; and standards specialists mapping vendor radio implementations to an international profile for interoperability.

Related standards

ISO/IEC 24730 is a multi‑part family. Key related documents include the main RTLS definition ISO/IEC 24730‑2 (network and system behaviours) and ISO/IEC 24730‑22 (DSSS 2.4 GHz air interface for transmitters using multiple spread codes and QPSK/WOQPSK schemes). Other related parts in the 24730 series cover UWB air interfaces (e.g., parts 61 and 62) and system profiles maintained by JTC 1/SC 31.

Keywords

RTLS; Real‑time locating systems; DSSS; 2.4 GHz; DBPSK; BPSK; air interface; physical layer; spread code; ISO/IEC 24730; JTC 1/SC 31.

FAQ

Q: What is this standard?

A: ISO/IEC 24730‑21:2012 is an international standard that defines the DSSS 2.4 GHz air‑interface (physical layer) protocol for RTLS transmitters that use a single spread code and DBPSK/BPSK modulation.

Q: What does it cover?

A: It covers transmitter‑level waveform, modulation, spreading, framing and timing details necessary to transmit RTLS beacons in the 2.4 GHz band with a single spread code; it enables PHY‑level interoperability within the ISO/IEC 24730 RTLS architecture while higher‑level system behaviour is specified in ISO/IEC 24730‑2.

Q: Who typically uses it?

A: Radio/firmware engineers, RTLS tag and module manufacturers, integrators and test labs use this part when designing, implementing or validating transmitter hardware and PHY conformance for RTLS deployments.

Q: Is it current or superseded?

A: ISO/IEC 24730‑21:2012 was published in 2012 (Edition 1) and the ISO record indicates the standard was reviewed and confirmed in the subsequent review cycle; it remains the published version unless formally superseded or withdrawn by ISO/IEC. For catalogue details see the ISO/IEC publication records.

Q: Is it part of a series?

A: Yes — it is a part of the ISO/IEC 24730 RTLS series (notably used with ISO/IEC 24730‑2 and ISO/IEC 24730‑22) and maintained under ISO/IEC JTC 1/SC 31 (Automatic identification and data capture techniques).

Q: What are the key keywords?

A: RTLS, DSSS, 2.4 GHz, DBPSK, BPSK, spread code, PHY, air interface, ISO/IEC 24730.