Overview
ISO/IEC 29157:2015 - Information technology - Telecommunications and information exchange between systems - PHY/MAC specifications for short-range wireless low-rate applications in the ISM band - defines the physical (PHY) characteristics and media access control (MAC) procedures for short-range, low-data-rate wireless links. The standard targets very low latency and point-to-multipoint topologies operating in the ISM band, providing a machine-readable specification of frame formats, management primitives and service access points needed to implement interoperable low-rate wireless systems.
Key topics and technical requirements
- PHY and MAC scope: Specifies PHY characteristics and MAC procedures suited to short-range, low-rate communications (ISM band) with emphasis on low-latency, point-to-multipoint connections.
- Interlayer service specification: Defines management and data primitives (MLME, PLME, MAC-SAP, PD-SAP) for control and data exchange:
- Examples: MLME-GET/SET, MLME-SCAN, MLME-MASTER-START, PLME-GET/SET/RESET.
- MAC PDU formats: Detailed MPDU definitions for multiple frame types:
- Beacon Frame (BF) and Fast Beacon Frame (FBF) - includes beacon frequency table, hopping sequence, superframe counters.
- Request Control Frame (RCF), Master Control Frame (MCF), acknowledgements (RACF/MACF), and Payload Frame (PF).
- Field-level definitions such as Open flag (2 bits), MAC version (6 bits), address/PHY version fields, 64-bit source/destination MAC addresses, and 16-bit CRC fields (TCRC16, MCRC16) are specified.
- MAC functional description: Procedures for frame exchange, addressing modes, superframe operation and frequency hopping behavior.
- Management interfaces: Formal MLME/PLME/PD service access points and primitives enabling consistent implementation and testing.
Practical applications and users
ISO/IEC 29157:2015 is intended for designers and implementers of low-rate wireless systems that require:
- Low-latency sensor networks, telemetry and control networks in industrial automation.
- Point-to-multipoint IoT applications using ISM-band radios where power efficiency and deterministic latency matter.
- Embedded systems engineers, PHY/MAC firmware developers, protocol stack integrators, test labs and product certification bodies seeking interoperability and conformance testing guidance.
Related standards and keywords
- Related work typically includes other ISO/IEC and regional standards for ISM-band wireless and short-range communication profiles for Internet of Things (IoT) and industrial wireless.
- SEO keywords: ISO/IEC 29157:2015, PHY/MAC specifications, ISM band, short-range wireless, low-rate wireless, point-to-multipoint, MLME, PLME, MAC PDU, beacon frame, low-latency wireless.
This standard is a practical reference for implementing interoperable PHY and MAC layers for short-range, low-rate ISM-band deployments.