IEC 63203-801-2:2022

Wearable electronic devices and technologies - Part 801-2: Smart body area network (SmartBAN) - Low complexity medium access control (MAC) for SmartBAN

IEC 63203-801-2:2022 specifies low complexity medium access control (MAC) for SmartBAN.
As the use of wearables and connected body sensor devices grows rapidly in the Internet of Things (IoT), wireless body area networks (BANs) facilitate the sharing of data in smart environments such as smart homes, smart life, etc. In specific areas of digital healthcare, wireless connectivity between the edge computing device or hub coordinator and the sensing nodes requires a standardized communication interface and protocols.
The present document describes the following medium access control (MAC) specifications:
channel structure;
MAC frame formats;
MAC functions.

Technologies et dispositifs électroniques prêts-à-porter - Partie 801-2: Smart body area network (SmartBAN) - Contrôle d’accès au support (MAC) à faible complexité pour SmartBAN

L’IEC 63203-801-2:2022 spécifie un contrôle d'accès au support (MAC) à faible complexité pour SmartBAN.
Alors que l'utilisation des dispositifs de capteurs corporels prêts-à-porter et connectés s'accroît rapidement dans l'Internet des objets (IoT, Internet of Things), les réseaux corporels sans fil (BAN) facilitent le partage des données dans les environnements intelligents tels que les maisons intelligentes, la vie intelligente, etc. Dans des domaines spécifiques des soins de santé numériques, la connectivité sans fil entre le dispositif informatique périphérique ou le coordinateur du concentrateur et les nœuds de détection exige une interface et des protocoles de communication normalisés.
Le présent document décrit les spécifications relatives au contrôle d'accès au support (MAC) suivantes:
structure du canal ;
formats de trame MAC ;
fonctions MAC.

General Information

• Status: Published
• Publication Date: 03-Nov-2022
• ICS: 35.100.01 - Open systems interconnection in general
• ICS: 35.240.80 - IT applications in health care technology
• Technical Committee: TC 124 - Wearable electronic devices and technologies
• Drafting Committee: WG 4 - TC 124/WG 4
• Current Stage: PPUB - Publication issued
• Start Date: 04-Nov-2022
• Completion Date: 02-Dec-2022

Overview

IEC 63203-801-2:2022 is an international standard developed by the International Electrotechnical Commission (IEC) that specifies the low complexity Medium Access Control (MAC) protocols and frameworks for Smart Body Area Networks (SmartBAN). As wearable electronic devices and connected body sensors become increasingly prevalent within the Internet of Things (IoT), the need for efficient, reliable, and standardized communication within wireless body area networks has grown. This standard addresses these challenges by defining a simplified MAC layer tailored for SmartBANs, enabling seamless wireless connectivity between body-worn sensing nodes and edge computing devices or hubs.

The standard provides detailed specifications on channel structures, MAC frame formats, and essential MAC functions, fostering interoperability and consistency in the design and deployment of SmartBANs. Its relevance is significant in connected health, smart home environments, and smart life applications where body sensor data exchange is critical for monitoring and control.

Key Topics

• Medium Access Control Framework: Establishes a low complexity MAC framework optimized for resource-constrained wearable devices operating in SmartBANs, supporting different device types and their communication needs.

• Frequency and Channel Structure: Defines the frequency spectrum and various channel formats used in SmartBAN communication, including control and data channels optimized for efficient wireless transmission.

• MAC Frame Formats: Details the structure of MAC frames including general frames, management frames (such as circuit beacons, requests, and assignments), and data frames. Frame components like headers, parity check, and body content are standardized for consistent implementation.

• MAC Functions and Procedures:

  • SmartBAN creation and connection initialization protocols
  • Scheduled channel access and slotted ALOHA mechanisms for efficient transmission
  • Multi-use channel access strategies for handling multiple communication sessions
  • Supplementary downlink data transmission capabilities
  • Slot reassignment and data channel migration to maintain network flexibility and robustness

• User Priorities and Node Identification: Introduces mechanisms for user priority management and unique node identification within SmartBAN, enabling quality of service (QoS) and addressing within the network.

• MAC Parameters: Presents recommended parameter values and operational configurations to guide device manufacturers and system integrators.

Applications

IEC 63203-801-2:2022 is strategically designed for use across various applications where wearable devices and body area networks are integral:

• Digital Healthcare and Medical Monitoring: Facilitates standardized communication between wearable health sensors and treatment or monitoring hubs, improving remote patient monitoring and health data accuracy.

• Smart Home and Intelligent Living: Enables smart environments where body sensor data enhances automation, security, and resident well-being through real-time context-aware interactions.

• Fitness and Wellness Tracking: Supports efficient data exchange for personal fitness devices, smart watches, and activity trackers with minimal power consumption.

• Industrial and Safety Wearables: Provides a reliable communication protocol for wearables used in hazardous or demanding work environments where continuous body sensor data is critical.

By adopting this low complexity MAC standard, device manufacturers can ensure reliable wireless communication that balances efficiency, power consumption, and scalability for wearable technologies in SmartBANs.

Related Standards

• IEC 63203 Series: This part 801-2 standard is part of the broader IEC 63203 series focusing on wearable electronic devices and technologies, offering complementary specifications on various aspects of SmartBAN and wearable device interoperability.

• IEEE 802.15.6: A widely referenced standard for wireless body area networks providing broader MAC and physical layer specifications for BANs; IEC 63203-801-2 may align or complement IEEE 802.15.6 in certain aspects.

• ISO/IEEE 11073: Standard for medical device communication, relevant in healthcare applications where wearable sensors transmit clinical data.

• IEC 62304: Focuses on software lifecycle processes in medical device software, applicable to wearable medical devices implementing SmartBAN communication protocols.

Conclusion

IEC 63203-801-2:2022 is an essential standard for developers, manufacturers, and integrators of wearable electronic devices and Smart Body Area Networks. By providing a low complexity MAC protocol tailored specifically for body sensor wireless communication, it supports the growth of IoT-connected wearables and ensures interoperability, energy efficiency, and reliable data transmission in smart healthcare, smart homes, and beyond. Its adoption promotes standardized network behavior, device compatibility, and advances the future of wearable technology networks.

Standards Content (Sample)

IEC 63203-801-2 ®
Edition 1.0 2022-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wearable electronic devices and technologies –
Part 801-2: Smart body area network (SmartBAN) – Low complexity medium
access control (MAC) for SmartBAN

Technologies et dispositifs électroniques prêts-à-porter –
Partie 801-2: Smart body area network (SmartBAN) – Contrôle d'accès au
support (MAC) à faible complexité pour SmartBAN

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IEC 63203-801-2 ®
Edition 1.0 2022-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Wearable electronic devices and technologies –

Part 801-2: Smart body area network (SmartBAN) – Low complexity medium

access control (MAC) for SmartBAN

Technologies et dispositifs électroniques prêts-à-porter –

Partie 801-2: Smart body area network (SmartBAN) – Contrôle d'accès au

support (MAC) à faible complexité pour SmartBAN

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 35.100.01; 35.240.80 ISBN 978-2-8322-6001-2

– 2 – IEC 63203-801-2:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Abbreviated terms . 8
5 General MAC framework . 9
5.1 Different device types . 9
5.2 Frequency spectrum . 10
5.3 Channel format . 10
5.3.1 Control channel format . 10
5.3.2 Data channel format . 10
5.4 User priorities . 13
5.5 Node ID . 14
5.6 IU . 14
6 Frame formats . 15
6.1 MAC general frame format . 15
6.1.1 General description . 15
6.1.2 MAC header . 15
6.1.3 MAC frame body . 18
6.1.4 Frame parity . 18
6.2 Management frames . 18
6.2.1 C-Beacon . 18
6.2.2 D-Beacon . 20
6.2.3 C-Req . 23
6.2.4 C-Ass . 25
6.2.5 S-Ras . 26
6.2.6 D-Req . 27
6.2.7 D-Res . 27
6.3 C-Frame . 27
6.4 D-Frame . 27
7 MAC functions . 28
7.1 General . 28
7.2 SmartBAN creation and connection initialization . 28
7.2.1 SmartBAN creation . 28
7.2.2 Connection initialization . 28
7.3 Channel access . 29
7.3.1 Scheduled channel access . 29
7.3.2 Slotted aloha channel access . 30
7.3.3 Multi-use channel access . 31
7.4 Supplementary downlink data transmission . 33
7.5 Slot reassignment . 34
7.6 Data channel migration . 35
8 MAC parameters. 36
Annex A (informative) Multi-use channel access . 37
Bibliography . 38

Figure 1 – SmartBAN topology . 9
Figure 2 – Structure of Control Channel . 10
Figure 3 – Access periods in Data Channel . 11
Figure 4 – Scheduled access slot structure . 12
Figure 5 – Control and management slot structure . 12
Figure 6 – Multi-use access slot structure . 12
Figure 7 – Structure of an IU . 14
Figure 8 – MAC general frame format . 15
Figure 9 – MAC header format . 15
Figure 10 – Frame control format . 16
Figure 11 – C-Beacon frame format . 19
Figure 12 – D-Beacon frame format . 21
Figure 13 – C-Req frame format . 23
Figure 14 – C-Ass frame format . 25
Figure 15 – D-Req frame structure (hub to node) . 27
Figure 16 – Connection procedure . 29
Figure 17 – Scheduled channel access . 29
Figure 18 – Downlink data transmission illustration . 34
Figure 19 – Slot reassignment illustration . 34
Figure 20 – Scheduled period slot reassignment procedure . 35
Figure 21 – Example of Data Channel Migration (from #1 to #3) . 36
Figure A.1 – Flowchart of multi-use channel access . 37

Table 1 – Values of T . 13
MUA
Table 2 – List of user priorities . 13
Table 3 – Contention probabilities for different user priorities . 13
Table 4 – Node ID table . 14
Table 5 – Element ID for different operations . 14
Table 6 – Frame Type and Frame Subtype fields . 16
Table 7 – Table of IDs . 18
Table 8 – Slot Length field encoding . 19
Table 9 – Bit values for the Duty Cycling field . 20
Table 10 – Mapping of PHY Capability field . 24
Table 11 – IM field for allocation request IU . 24
Table 12 – IM field for allocation assignment IU . 26
Table 13 – IM field for S-Ras IU . 26
Table 14 – MAC parameters . 36

– 4 – IEC 63203-801-2:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
WEARABLE ELECTRONIC DEVICES AND TECHNOLOGIES –

Part 801-2: Smart body area network (SmartBAN) –
Low complexity medium access control (MAC) for SmartBAN

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
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9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 63203-801-2 has been prepared by IEC technical committee 124: Wearable electronic
devices and technologies. It is an International Standard.
The text of this International Standard is based on the following documents:
Draft Report on voting
124/198/FDIS 124/206/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available

at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 63203 series, published under the general title Wearable electronic
devices and technologies, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

– 6 – IEC 63203-801-2:2022 © IEC 2022
INTRODUCTION
TC 124 is developing International Standards (IS) for body area network (BAN) to define the
wireless connectivity between the hub coordinator and the sensing nodes. The IEC 63203-801
series consists of the following sub-parts, under the general part title "Smart body area network
(SmartBAN)":
IEC 63203-801-1: Enhanced ultra-low power physical layer
IEC 63203-801-2: Low complexity medium access control (MAC) for SmartBAN
The present document describes the medium access control (MAC) specifications including
channel structure, MAC frame formats and MAC functions.
This document originates from the corresponding technical specification (ETSI TS 103 325)
standardized in the European Telecommunication Standard Institute (ETSI) and captures the
results the work of IEC TC 124 Working Group 4 on devices and systems. The current document
reflects contributions and discussions by IEC TC 124 experts, mirror committees, liaison
members and Joint Advisory Group (JAG) between IEC SyC. AAL, IEC TC 100 and IEC TC 124.
This document contains material gathered from reports and group output from the IEC TC 124
meetings in May 2018 (Manchester), October 2018 (Busan), May 2019 (San Francisco),
September 2019 (Shanghai), November 2020 (online) as well as information obtained during
various web meetings.
Experts from the following national committees, liaison organizations have contributed: BE, CN,
DE, FI, FR, GB, IN, JP, KR, MY, NL, US and ETSI TC SmartBAN.
This document is also positioned as a result of the activities of the JAG. At the IEC General
Meeting in Busan in 2018, three committees related to wearable systems and technologies,
SyC. AAL, IEC TC 100 and IEC TC 124 had a joint workshop and agreed to collaborate to
develop relevant standards and to share roles. This collaboration agreement was advanced to
a Joint Advisory Group (JAG) and the JAG was established managed by SyC. AAL in 2019.
The target audience for this document includes the following stakeholders who have an interest
in the systems and services using wearable devices:
• consumer electronics (CE) and information communications technology (ICT) device
manufacturers;
• system integrators who want to utilize wearable device and technologies;
• service operators who are interested in the AAL systems and services;
• stakeholders who want to understand the technologies and requirements for wireless
connectivity between wearable sensor nodes and hub coordinators.

WEARABLE ELECTRONIC DEVICES AND TECHNOLOGIES –

Part 801-2: Smart body area network (SmartBAN) –
Low complexity medium access control (MAC) for SmartBAN

1 Scope
This part of IEC 63203-801 specifies low complexity medium access control (MAC) for
SmartBAN.
As the use of wearables and connected body sensor devices grows rapidly in the Internet of
Things (IoT), wireless body area networks (BANs) facilitate the sharing of data in smart
environments such as smart homes, smart life, etc. In specific areas of digital healthcare,
wireless connectivity between the edge computing device or hub coordinator and the sensing
nodes requires a standardized communication interface and protocols.
The present document describes the following medium access control (MAC) specifications:
– channel structure;
– MAC frame formats;
– MAC functions.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undated references, the latest edition of the referenced document (including any
amendments) applies.
IEC 63203-801-1:2022, Wearable electronic devices and technologies – Part 801-1: Smart body
area network (SmartBAN) – Enhanced ultra-low power physical layer
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
beacon
frame transmitted by a hub to facilitate network management, such as the coordination of
medium access and power management of the nodes in the SmartBAN, and to facilitate clock
synchronizationwith the hub
3.2
beacon period
duration during which a beacon is transmitted

– 8 – IEC 63203-801-2:2022 © IEC 2022
3.3
downlink
communication link for transfer of management and data traffic from a hub to a node
3.4
hub
entity that possesses a node’s functionality and coordinates the medium access and power
management of the nodes in the SmartBAN
3.5
inactive period
period in time following an active transmission sequence during which the equipment does not
transmit or receive
3.6
node
any entity conforming to the SmartBAN medium access control and physical interface to the
wireless medium
3.7
priority channel access
highest priority access during multi-use channel access
3.8
re-use channel access
priority access during multi-use channel access which enables re-use of scheduled but non-
utilised slots
3.9
scheduled access
one or more scheduled recurring time intervals that a node and a hub obtain using scheduled
access to initiate frame transactions
Note 1 to entry: A scheduled allocation is an uplink allocation or a downlink allocation suitable for servicing high or
low duty cycle periodic or quasi-periodic traffic on a committed schedule.
3.10
uplink
communication link for transfer of management and data traffic from a node to a hub
4 Abbreviated terms
ACK Acknowledgement
BAN Body area network
C-Ass Connection assignment
C-Beacon Control channel beacon
C-Frame Control frame
CRC Cyclic redundancy check
C-Req Connection request
D/SR Downlink/slot reassignment
D-Beacon Data channel beacon
D-Frame Data frame
D-Req Disconnection request
D-Res Disconnection response
TM
EUI-48 Extended Unique Identifier-48 bits
FCS Frame check sequence
FEC Forward error correction
IFS Inter-frame spacing
IM Information module
ISM Industrial, scientific and medical
IU Information unit
MAC Medium access control
NACK Negative acknowledgement
NID Node ID
PHY Physical layer
REP Repetition coding
Rx Receive
S-Ras Slot reassignment
Tx Transmit
UL Uplink
5 General MAC framework
5.1 Different device types
Clause 5 provides the basic MAC framework for the nodes and hubs.
Two different device types can participate in SmartBAN:
1) sensor device (node); and
2) coordinator device (hub).
A hub is a device that acts as a SmartBAN coordinator. A node is any device that acts as an
information source or an information sink. One hub and at least one node constitute a SmartBAN.
A SmartBAN shall be organized into a star topology illustrated in Figure 1. It shall consist of at
least one node communicating directly with the hub.

Figure 1 – SmartBAN topology
– 10 – IEC 63203-801-2:2022 © IEC 2022
The hub and nodes shall communicate using communication media known as channels. A
SmartBAN shall use two different channel entities to enable communication between the hub
and nodes. The channel entities are assigned the following names:
– Data Channel
– Control Channel
Each SmartBAN shall utilise one Control Channel and one Data Channel at any one time.
5.2 Frequency spectrum
The frequency of operation shall fall between 2 401 MHz and 2 481 MHz. The channels shall
be arranged in blocks of 2 MHz with centre frequencies as follows:
f = 2 402 + 2 × n MHz, where n = 0 to 39.
c
The channels are categorised into Data and Control Channels with:
• 3 Control Channels, where control frames (in the form of C-Beacon) from the hub are
transmitted;
• 37 Data Channels, where data, control, and management frames are transmitted.
The list of channels can be found in IEC 63203-801-1.
5.3 Channel format
5.3.1 Control channel format
Only hub devices shall transmit on Control Channels shown in Figure 2. A hub shall select one
Control Channel from the list of Control Channels in IEC 63203-801-1:2022, Table 1 and
transmit one control beacon frame (C-Beacon) on the chosen Control Channel every T s. The
C
format of the C-Beacon is set out in 6.2.1.

Figure 2 – Structure of Control Channel
5.3.2 Data channel format
5.3.2.1 Data channel description
Both hub and node devices may transmit on the Data Channels. A hub shall select one Data
Channel from the list of Data Channels in IEC 63203-801-1:2022, Table 1, on which both hub
and node devices in the associated SmartBAN may transmit. Data Channel format is illustrated
in Figure 3. For any SmartBAN, the Data Channel is partitioned into time intervals of T s,
D
known as the Inter-beacon Interval. The boundaries of each Inter-beacon Interval shall be
marked by the transmission of a Data Channel Beacon (D-Beacon). A hub shall transmit a
D-Beacon at the beginning of each Inter-beacon Interval.

Each Inter-beacon Interval shall be partitioned into L distinct time epochs known as slots. The
D
duration of each time slot is T . The duration of each Inter-beacon Interval shall be (L × T ) s.
S D S
Any device transmitting in a time slot shall ensure that the transmission takes place within the
duration of that time slot.
Each Inter-beacon Interval shall consist of four distinct periods:
1) Beacon Period, consisting of one single time slot, where the D-Beacon frame shall be
transmitted by the hub. No nodes shall transmit in this period;
2) Scheduled Period, consisting of N time slots, where scheduled transmissions and
S
acknowledgements occur;
3) Control and Management Period, consisting of N time slots, where unscheduled access,
CM
and management and control signaling occur;
4) Inactive Period, where no transmission occurs.
The time slots shall be identified by a 10-bit sequence denoting the position of the time slot in
an Inter-beacon Interval. The Beacon Period, consisting of 1 time slot shall have the sequence
number 0000000000. Subsequent time slots shall have sequence numbers incremented by the
number of time slots following the Beacon Period.

Figure 3 – Access periods in Data Channel
The Scheduled Access Period shall begin on the slot boundary immediately following the
Beacon. The Scheduled Access Period may be of zero length, in which case the Control and
Management Period shall begin immediately following the Beacon Period. The Control and
Management Period shall begin on the slot boundary immediately following the Scheduled
Access Period. The Inactive Period shall begin on the slot boundary immediately following the
Control and Management Period.
Three types of channel access mechanisms can be used in the access periods:
– Scheduled Channel Access, in the Scheduled Access Period;
– Slotted Aloha Channel Access, in the Control and Management Period;
– Multi-use Channel Access, in both Scheduled Access and Control and Management Period.
The hub and nodes shall always support Scheduled Channel Access and Slotted Aloha Channel
Access, and may support Multi-use Channel Access. Multi-use Channel Access may only be
used when every node in the SmartBAN supports it. Each channel access mechanism shall
adhere to its respective slot structure as described in 5.3.2.2.

– 12 – IEC 63203-801-2:2022 © IEC 2022
5.3.2.2 Scheduled access slot structure

Figure 4 – Scheduled access slot structure
The Scheduled Access time slots shall follow the structure as illustrated in Figure 4. Any
Scheduled Access time slots allocated by the hub shall be in the Scheduled Access Period.
The Scheduled Access slot shall consist of at most two transmission periods:
1) D-Frame Transmission: the device allocated to the time slot shall transmit;
2) ACK Frame Transmission: if the ACK policy of the received frame defined in 6.1.2.2.3 is ‘0’
and the transmission is successful, the receiving device shall transmit an Acknowledgement
Frame. If the ACK policy is ‘1’ and the transmission is not successful, the receiving device
shall transmit a NACK Frame. The ACK Frame Transmission period shall commence one
IFS after the end of the Data Transmission period and end at least one IFS before the end
of the time slot.
5.3.2.3 Control and management slot structure

Figure 5 – Control and management slot structure
The Control and Management time slots shall follow the structure as illustrated in Figure 5.
The Control and Management slot shall consist of two transmission periods:
1) Data/Management Frame Transmission: any device wishing to transmit either data or
management frames may transmit;
2) ACK Frame Transmission: if the ACK policy of the received frame defined in 6.1.2.2.3 is ‘0’
and the transmission is successful, the receiving device shall transmit an Acknowledgement
Frame. If the ACK policy is ‘1’ and the transmission is not successful, the receiving device
shall transmit a NACK Frame. The ACK Frame Transmission period shall commence one
IFS after the end of the Data Transmission period and end at least one IFS before the end
of the time slot.
5.3.2.4 Multi-use access slot structure

Figure 6 – Multi-use access slot structure

The Multi-use Access time slots should follow the structure as illustrated in Figure 6. The
support of the Multi-use Access time slot is optional. The Multi-use Access time slots should be
used when Multi-use Access is in operation.
The Multi-use Access slot should consist of one sensing period, and at most two transmission
periods:
– Sensing: the sensing period, T , should depend on the traffic type. The values of T
MUA MUA
are defined in Table 1, where T is the minimum sensing period as defined in Clause 8.
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Any device wishing to transmit should sense the channel for a period of T . If the channel
MUA
is busy, the device should wait for the next available Multi-use Access time before another
attempt is made. If the channel is found to be idle, the device may commence data
transmission.
– D-Frame Transmission: any device that has sensed the channel for the sensing period
above may transmit if the channel is found to be idle.
– Acknowledgement period: the receiving device may transmit an Acknowledgement frame if
the transmission is successful, depending on the acknowledgement policy.
Table 1 – Values of T
MUA
Type of user Type of traffic Access period T
MUA
Any user Very high priority traffic (User priority 3) Scheduled Access 0
Slot owner Any traffic Scheduled Access T
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Non-slot owner Any traffic Scheduled Access 2 × T
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Any user Very high priority traffic (User priority 3) Control & Management Access 0
Any user Any traffic Control & Management Access T
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5.4 User priorities
Four user priority levels shall be defined in the operation of a SmartBAN. The user priorities are
defined in Table 2. The user priority shall determine the contention probability of the node in
Slotted Aloha Channel Access. The range of contention probabilities for different user priority
levels is listed in Table 3.
Table 2 – List of user priorities
User priority Data type
0 Low priority
1 Mid priority
2 High priority
3 Very high priority
Table 3 – Contention probabilities for different user priorities
User priority Contention probability
CP CP
max min
0 1/8 1/16
1 1/4 1/16
2 1/2 1/8
3 1 1/2
– 14 – IEC 63203-801-2:2022 © IEC 2022

5.5 Node ID
The Node ID of devices in a SmartBAN shall be assigned according to Table 4.
Table 4 – Node ID table
NID value NID NID notation NID usage
subtotal
00000000 1 Unconnected NID For unicast from/to unconnected nodes in a BAN
00000001- 16 Connected NID For unicast from/to connected nodes in a BAN
00010101 1 Hub NID For hubs
11111111 1 Broadcast NID For broadcast to all nodes

5.6 IU
IUs encapsulate the required information for specific operations. Operations requiring IUs shall
use the appropriate Element ID listed in Table 5. An IU shall be formatted as in Figure 7.

Figure 7 – Structure of an IU
An IU comprises an Element ID field, a Length field, and multiple Information Module (IM) fields.
The Element ID field denotes the type of operation the IU is used for. The field shall be set
according to Table 5.
The Length field denotes the number of IM fields the IU has. Each IU can have up to 32 IM
fields.
The Information Module field is operation specific and has a length of L .
IM
Table 5 – Element ID for different operations
Element ID Operation Description
000 Uplink request Specifies uplink requirements for scheduled uplink transmissions
001 Downlink request Specifies downlink requirements for scheduled downlink
transmissions
010 Uplink assignment Specifies uplink assignment parameters for scheduled
transmissions
011 Downlink request Specifies downlink assignment parameters for scheduled
assignment transmissions
100 Uplink slot reassignment Specifies new slot allocations in the Scheduled Access Period
for different nodes in the uplink
Downlink slot Specifies new slot allocations in the Scheduled Access Period
reassignment for different nodes in the downlink

6 Frame formats
6.1 MAC general frame format
6.1.1 General description
All MAC frames shall be formed by concatenation of a MAC Header of 56 bits, a MAC Frame
Body of L bits, and a Frame Parity of 16 bits as shown in Figure 8. The MAC Frame Body has
F
a length of L bits and is present only if it has a nonzero length. The MAC frame shall also be
F
called the MPDU.
Figure 8 – MAC general frame format
6.1.2 MAC header
6.1.2.1 MAC header format
Figure 9 illustrates the MAC header format. The MAC header shall consist of:
• a Frame Control field,
• a Recipient ID field,
• a Sender ID field,
• a BAN ID field, and
• an FCS.
Figure 9 – MAC header format
6.1.2.2 Frame control
6.1.2.2.1 Frame control format
The 24-bit Frame Control field shall be formatted as shown in Figure 10.

– 16 – IEC 63203-801-2:2022 © IEC 2022

Figure 10 – Frame control format
6.1.2.2.2 Protocol version
The Protocol Version field is set to ‘000’. All other values are reserved.
6.1.2.2.3 ACK policy
The ACK Policy field indicates the acknowledgement type used by the current frame. The field
is set to ‘0’ to indicate that an ACK frame shall be sent when a transmission is successful. The
field is set to ‘1’ to indicate that no ACK frames shall be sent when a transmission is successful,
but a NACK shall be sent when a transmission is unsuccessful. When NID is set to ‘11111111’
(Broadcast), ACK Policy is not applied.
6.1.2.2.4 Frame type
The Frame Type field is set to indicate the type of the current frame. The three defined Frame
Types are: Management, Control, and Data. The Frame Subtype and Frame Type are given in
Table 6.
Table 6 – Frame Type and Frame Subtype fields
Field value Frame Type Field value Frame Subtype
00 Management 000 Beacon
00 Management 001 Connection Request
00 Management 010 Connection Assignment
00 Management 011 Slot Reassignment
00 Management 100 Disconnection Request
00 Management 101 Disconnection Response
00 Management 110 Inter HUB
00 Management 111 Reserved
01 Control 000 ACK
01 Control 001 NACK
10 Data 000 User Priority 0
10 Data 001 User Priority 1
10 Data 010 User Priority 2
10 Data 011 User Priority 3
10 Data 100 Inter HUB
11 Reserved 101-111 Reserved
6.1.2.2.5 Frame subtype
The Frame Subtype field shall be set as defined in Table 6.
6.1.2.2.6 Sequence number
The Sequence Number field specifies the sequence identifier of the frame.

The Sequence Number is applicable for both beacon and data frames. The values of the
Sequence Number field are set as follows:
– The field is set to zero if the frame is the first data type frame of this frame subtype to a
recipient.
– The field is incremented by one, modulo 256, from its value in the frame that was the same
frame type of this frame subtype and addressed to a recipient.
– For data type frames, the field is kept with the same value if frames contain fragments of
the same MAC Frame Body or are being retransmitted to the same recipient.
6.1.2.2.7 Fragment number
The 3-bit Fragment Number field is applicable for the data type frames. The values of Fragment
Number are set as follows:
– The Fragment Number field is set to zero if the current frame contains no MAC Frame Body,
a MAC Frame Body not fragmented, or the first fragment of a fragmented MAC Frame Body.
– The value of the field is incremented by one from its value in the frame containing the
previous fragment of the MAC Frame Body if the current frame contains a non-first fragment
of a fragmented MAC Frame Body or is kept with the same value if the frame is being
retransmitted to the same recipient.
In all other frames, it is reserved.
6.1.2.2.8 Non-final fragment
The 1-bit Non-final Fragment field is only applicable to data type frames.
The Non-final Fragment field is set as follows:
– to 0 (zero) if the current frame contains no MAC Frame Body, a MAC Frame Body not
fragmented, or the final fragment of a fragmented MAC Frame Body; or
– to 1 (one) if the frame contains a non-final fragment of a fragmented MAC Frame Body.
In all other frames, it is reserved.
6.1.2.2.9 Command acknowledgement
The 1-bit Command Acknowledgement field shall be set as follows:
– to 1 (one) if the node acknowledges that the node has received the slot reassignment or
downlink data request command from the hub;
– to 0 (zero) otherwise.
6.1.2.3 Recipient ID
The Recipient ID is an 8-bit ID identifying the recipient of the frame, assigned previously by the
hub according to Table 4. The specific recipient ID of each frame is defined in Table 7.
6.1.2.4 Sender ID
The Sender ID is an 8-bit sequence identifying the sender of the frame. The specific sender ID
of each frame is defined in Table 7.
6.1.2.5 BAN ID
The BAN ID is an 8-bit abbreviated address identifying the SmartBAN of the sender and
recipient. The specific
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