Information technology — Telecommunications and information exchange between systems — Short Distance Visible Light Communication (SDVLC)

ISO/IEC 17417:2011 specifies a phsical layer (PHY) and medium access control (MAC) for communication of up to 10 cm distance with an fm of 120 MHz using visual light with the wavelength between 380 nm and 780 nm. In addition, it specifies human-detectable brightness control that is independent of the modulation for the data transfer.

Technologies de l'information — Téléinformatique — Communication à courte distance utilisant la lumière visible (SDVLC)

General Information

Status
Published
Publication Date
27-Nov-2011
Current Stage
9060 - Close of review
Start Date
08-Mar-2017
Ref Project

RELATIONS

Buy Standard

Standard
ISO/IEC 17417:2011 - Information technology -- Telecommunications and information exchange between systems -- Short Distance Visible Light Communication (SDVLC)
English language
29 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO/IEC
STANDARD 17417
First edition
2011-12-01
Information technology —
Telecommunications and information
exchange between systems — Short
Distance Visible Light Communication
(SDVLC)
Technologies de l'information — Téléinformatique — Communication à
courte distance utilisant la lumière visible (SDVLC)
Reference number
ISO/IEC 17417:2011(E)
ISO/IEC 2011
---------------------- Page: 1 ----------------------
ISO/IEC 17417:2011(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO/IEC 2011

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or

ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO/IEC 2011 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC 17417:2011(E)
Contents Page

Foreword ............................................................................................................................................................. v

Introduction ........................................................................................................................................................ vi

1  Scope ...................................................................................................................................................... 1

2  Conformance ......................................................................................................................................... 1

3  Normative references ............................................................................................................................ 1

4  Terms,definitions and abbreviations ................................................................................................... 2

5  Conventions and notations .................................................................................................................. 6

6  General ................................................................................................................................................... 6

7  Physical Layer ....................................................................................................................................... 6

8  Transmitter and Receiver Block Diagram ........................................................................................... 7

8.1  Transmitter to Receiver Link ................................................................................................................ 7

8.2  Data Encoding ....................................................................................................................................... 7

8.2.1  8B10 Data Encoding .............................................................................................................................. 8

8.2.2  2B4B Data Encoding ............................................................................................................................. 8

8.3  Modulation ............................................................................................................................................. 8

8.4  Bit Order ................................................................................................................................................. 8

9  Frame Formats ....................................................................................................................................... 8

9.1  Frame Structure overview .................................................................................................................... 9

9.2  Frame Structure Detail ........................................................................................................................ 10

9.2.1  Start Indicator Structure ..................................................................................................................... 10

9.2.2  Control Header Structure.................................................................................................................... 11

9.3  MAC PDU Structure ............................................................................................................................. 13

9.3.1  MAC Header ......................................................................................................................................... 13

9.3.2  Payload ................................................................................................................................................. 14

9.3.3  Payload CRC ........................................................................................................................................ 15

9.4  Visible Frame ....................................................................................................................................... 15

9.4.1  Visible Pattern ...................................................................................................................................... 15

9.5  Cyclic Redundancy Check (CRC) ...................................................................................................... 16

10  Connection Procedure ........................................................................................................................ 16

11  Association Operation Messages ...................................................................................................... 17

11.1  Association Request (AS-REQ) ......................................................................................................... 17

11.2  Association Response (AS-RSP) ....................................................................................................... 18

11.3  Association Acknowledge (AS-ACK) ................................................................................................ 18

11.4  Disassociation Request (DAS-REQ) .................................................................................................. 19

11.5  Disassociation Response (DAS-RSP) ............................................................................................... 19

11.6  Disassociation Acknowledge (DAS-ACK) ......................................................................................... 20

12  Data Burst Modes Operation .............................................................................................................. 20

12.1  Periodic Burst Mode ............................................................................................................................ 20

12.1.1  Burst Request Message (BR-REQ) .................................................................................................... 21

12.1.2  Burst Response Message (BR-RSP) ................................................................................................. 23

12.2  Aperiodic Burst Mode ......................................................................................................................... 24

12.2.1  Aperiodic Burst Request Message (ABR-REQ) ................................................................................ 25

12.2.2  Aperiodic Burst Response Message (ABR-RSP) ............................................................................. 26

13  Data Encoding Change ....................................................................................................................... 28

13.1  ENC-REQ (Data Encoding Change Request) .................................................................................... 28

© ISO/IEC 2011 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/IEC 17417:2011(E)

13.2  ENC-RSP (Data Encoding Change Response) .................................................................................28

iv © ISO/IEC 2011 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/IEC 17417:2011(E)
Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical

Commission) form the specialized system for worldwide standardization. National bodies that are members of

ISO or IEC participate in the development of International Standards through technical committees

established by the respective organization to deal with particular fields of technical activity. ISO and IEC

technical committees collaborate in fields of mutual interest. Other international organizations, governmental

and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information

technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of the joint technical committee is to prepare International Standards. Draft International

Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as

an International Standard requires approval by at least 75 % of the national bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent

rights. ISO and IEC shall not be held responsible for identifying any or all such patent rights.

ISO/IEC 17417 was prepared by Ecma International (as ECMA-397) and was adopted, under a special “fast-

track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology, in parallel with its

approval by national bodies of ISO and IEC.
© ISO/IEC 2011 – All rights reserved v
---------------------- Page: 5 ----------------------
ISO/IEC 17417:2011(E)
Introduction

Short Distance Visible Light Communication (SDVLC) uses visible light LEDs for data communication. In most

cases, LEDs with the primary purpose of illumination will take on the secondary purpose of acting as a digital

data communication source; in other cases the LED’s primary purpose will be data communication while the

secondary purpose will be to communicate visible status to the user. With the extension of the application of

LEDs from the primary purpose of illumination to the secondary purpose of data communication, VLC can be

also applied to short range data communication.

With SDVLC, “what you see is what you send”. One possible application of SDVLC is high speed

mobile-to-mobile communication.
vi © ISO/IEC 2011 – All rights reserved
---------------------- Page: 6 ----------------------
INTERNATIONAL STANDARD ISO/IEC 17417:2011(E)
Information technology — Telecommunications and information
exchange between systems — Short Distance Visible Light
Communication (SDVLC)
1 Scope

This International Standard specifies a phsical layer (PHY) and medium access control (MAC) for

communication of up to 10 cm distance with an f of 120 MHz using visual light with the wavelength between

380 nm and 780 nm.

In addition it specifies human-detectable brightness control that is independent of the modulation for the data

transfer.
2 Conformance
Conformant implementations:
 have both a Transmitter and a Receiver;
 use 8B10B encoding and may use 2B4B encoding;
 use an f of 120 MHz as specified in 8.3.
3 Normative references

The following referenced documents are indispensable for the application 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.

ISO/IEC 18092:2004, Information technology — Telecommunications and information exchange between

systems — Near Field Communication — Interface and Protocol (NFCIP-1)

ISO/IEC 7498-1, Information technology — Open Systems Interconnection — Basic Reference Model: The

Basic Model

ISO/IEC 14165-251, Information technology — Fibre Channel — Part 251: Framing and Signaling (FC-FS)

ITU-T Z.100, Specification and Description Language (SDL)
RFC 791, Internet Protocol — DARPA Internet Program — Protocol Specification
© ISO/IEC 2011 – All rights reserved 1
---------------------- Page: 7 ----------------------
ISO/IEC 17417:2011(E)
4 Terms,definitions and abbreviations

For the purposes of this document, the terms, definitions and abbreviations given in ISO/IEC 7498-1 and the

following apply.
4.1
Ack
Acknowledge
4.2
Ack/Nack
4.3
ABR-REQ
Aperiodic Burst Request
4.4
ABR-RSP
Aperiodic Burst Response
4.5
AS-ACK
Association Acknowledge
4.6
AS-REQ
Association Request
4.7
AS-RSP
Association Response
4.8
Burst Master
Burst scheduler
4.9
Burst Slave
Burst schedule follower
4.10
BR-REQ
Burst Request
4.11
BR-RSP
Burst Response
4.12
Burst Start
4.13
BWS
Burst Window Size
2 © ISO/IEC 2011 – All rights reserved
---------------------- Page: 8 ----------------------
ISO/IEC 17417:2011(E)
4.14
CHC
Control Header CRC
4.15
CRC
Cyclic Redundancy Check
4.16
DAS-ACK
Disassociation Acknowledge
4.17
DAS-REQ
Disassociation Request
4.18
DAS-RSP
Disassociation Response
4.19
DCC-REQ
Duty Cycle Change Request
4.20
DCC-RSP
Duty Cycle Change Response
4.21
dectet
group of 10 bits (cf. octet)
4.22
DER
Data Encoding Response
4.23
Disassociatee
recipient of a DAS-REQ
4.24
Disassociator
initiator of a disassociation
4.25
DQWS
Data Quiet Window Size
4.26
ENC
Data Encoding
4.27
Frame Length
4.28
Frequency of modulation clock that changes the optical output signal
© ISO/IEC 2011 – All rights reserved 3
---------------------- Page: 9 ----------------------
ISO/IEC 17417:2011(E)
4.29
Frame Type
4.30
Initiator
initiator of an association
4.31
LEN
Length
4.32
MAC Flag
4.33
MHC
MAC Header CRC
4.34
Management Message
4.35
Nack
Negative Acknowledge
4.36
OOK
On-Off Keying
4.37
Operation
4.38
Payload Length
4.39
PDU
Protocol Data Unit
[ISO/IEC 7498-1]
4.40
PSN
PDU Sequence Number
4.41
Response Code
4.42
Recipient
receiver of a frame
4 © ISO/IEC 2011 – All rights reserved
---------------------- Page: 10 ----------------------
ISO/IEC 17417:2011(E)
4.43
RFU
Reserved for Future Use
4.44
RID
Recipient ID
4.45
RVF
Recipient VF
4.46
SDL
Specification and Description Language (ITU-T Z.100)
4.47
SDU
Service Data Unit
[ISO/IEC 7498-1]
4.48
SDVLC
Short Distance Visible Light Communication
4.49
Sender
sender of a frame
4.50
Start Indicator
4.51
SID
Sender ID
4.52
SMF
Supported Modulation Frequencies
4.53
Target
recipient of an AS-REQ
4.54
Visible Frame
4.55
VFA
VF Mode Stop Approve
4.56
VFR
VF Mode Stop Request
© ISO/IEC 2011 – All rights reserved 5
---------------------- Page: 11 ----------------------
ISO/IEC 17417:2011(E)
4.57
VLC
Visible Light Communication
5 Conventions and notations

The following conventions and notations apply in this document unless otherwise stated.

 The setting of bits is denoted by ZERO or ONE.

 An individual bit in a field is identified by a numerical subscript of the field name, where for numeric values

the least significant bit of the value is assigned to the bit with subscript 0.
 (xxxxxxx)b denotes a sequence of binary digits.
6 General
All RFU bits shall be set to 0 by the Sender and ignored by the Recipient.
Unless otherwise stated, all RFU values shall be ignored by the Recipient.
7 Physical Layer
Figure 1 illustrates the basic model of the SDVLC Transmitter and Receiver.

A SDVLC Transmitter shall have an optical output with a minimum peak irradiance of 3 W/m between 380 nm

and 780 nm over an area of at least 1,0 cm × 1,0 cm at a distance of 10 cm, and a 10% to 90% rise time t

and fall time t of at most 3,0 ns, illustrated in Figure 2. The SDVLC Transmitter shall have a maximum off

irradiance of 1 mW/m .

A SDVLC Receiver shall have an optical sensitivity from 380 nm to 780 nm and from 0 cm to at least 10 cm

from a SDVLC Transmitter.
Figure 1 — SDVLC Transmitter and Receiver
6 © ISO/IEC 2011 – All rights reserved
---------------------- Page: 12 ----------------------
ISO/IEC 17417:2011(E)
Figure 2 — SDVLC Modulation Waveform
8 Transmitter and Receiver Block Diagram
8.1 Transmitter to Receiver Link

In Figure 3, the modular structures of SDVLC system are shown. When data is to be transmitted, the data is

encoded by the Data Encoding block. In the Modulation block, encoded data is used to modulate the optical

output. The optical output is then transmitted to the Receiver. The Demodulation block of the Receiver

demodulates the optical signal. The demodulated signal is then decoded by the Data Decoding block.

Optical
Transmitter Data
Modulation Signal
Data Encoding
Output
Optical
Receiver Data
Demodulation Signal
Data Decoding
Input
Figure 3 — Transmitter and Receiver block diagram
8.2 Data Encoding

SDVLC supports two different data encoding schemes. One of the data encoding schemes (8B/10B) allows

the maximum data throughput but has a fixed optical link duty cycle of 50%. The other data encoding scheme

(2B4B) has a lower data throughput but allows optical link duty cycles other than 50%.

© ISO/IEC 2011 – All rights reserved 7
---------------------- Page: 13 ----------------------
ISO/IEC 17417:2011(E)
8.2.1 8B10 Data Encoding

When using 8B/10B encoding, the SDVLC Transmitter shall use the 8B/10B encoding as specified in

ISO/IEC 14165-251.
8.2.2 2B4B Data Encoding

In 2B4B encoding, the SDVLC Transmitter shall encode pairs of data bits into 4 bit symbols by selecting a row

of Table 1. Note that which row is selected in Table 1 can be different for each pair of data bits, thus allowing

for average duty cycles between 25% and 75%.
Table 1 — Data Encoding
Data
(00)b (01)b (10)b (11)b
25% (0001)b (0010)b (0100)b (1000)b
Encoded Data
50% (0011)b (0110)b (1100)b (1001)b
Duty Cycle
75% (1110)b (1101)b (1011)b (0111)b
8.3 Modulation
The modulation of the optical link is On-Off Keying (OOK).

SDVLC may support a maximum of 16 different OOK f . The f of 120 MHz is mandatory. The f shall be at

m m m

the specified frequency with a relative frequency tolerance of ± 20 × 10 % and a maximum peak jitter of

100 ps.
Bit duration time t (illustrated in Figure 2) is 1/f .
b m
8.4 Bit Order

The least significant bit of each symbol shall be transmitted first, while the most significant bit of each symbol

shall be transmitted last.
9 Frame Formats

SDVLC transmissions shall be in the form of a sequence of frames, as shown in Figure 4. Each frame in the

sequence is either a Data Frame or a Visible Frame.
Figure 4 — Frame Sequence
8 © ISO/IEC 2011 – All rights reserved
---------------------- Page: 14 ----------------------
ISO/IEC 17417:2011(E)
9.1 Frame Structure overview

Two frame structures shall be used in SDVLC: a Data Frame structure, as specified in Figure 5, and a Visible

Frame structure, as specified in Figure 6.
Figure 5 — Data Frame structure
© ISO/IEC 2011 – All rights reserved 9
---------------------- Page: 15 ----------------------
ISO/IEC 17417:2011(E)
Figure 6 — Visible Frame structure

The choice of which frame structure to use may depend on the communication link status. When the

communication link between Transmitter and Receiver is established with good alignment, the Data Frame

structure is used for data communication. The Visible Frame structure is used to control the visible aspect of

the communication beam to notify the user of a link failure (such as misalignment between the two devices)

when the communication link between Transmitter and Receiver is not established. The decision of which

frame structure to use may be made using the information in the control header, and when the communication

link fails or becomes misaligned, the frame structure type may be changed.

The Visible Frame structure may be also used to cause the devices to show a beam while not transmitting

data, thus making visible the communication link.
9.2 Frame Structure Detail

The frame structure for SDVLC shall consist of Start Indicator, Control Header, and either a series of one or

more MAC PDUs or a Visible Pattern.
9.2.1 Start Indicator Structure

The Start Indicator structure shall consist of Preamble_1 and Preamble_2 as specified below.

Preamble_1 shall be (10)b repeated 800 times. Preamble_1 may be used by the Recipient to synchronize the

receive data clock to the received data.

For 2B4B encoding, Preamble_2 shall be (11110000)b repeated five times. For 8B/10B encoding, Preamble 2

shall be the 8B/10B K28.1 symbol repeated four times. The Recipient shall check Preamble_2 field, and if

Preamble_2 is not correct the Recipient shall consider a frame to not be started. Preamble_2 may be used by

the Recipient for symbol synchronization to denote the end of the Preamble_1 and the start of PHY data.

10 © ISO/IEC 2011 – All rights reserved
---------------------- Page: 16 ----------------------
ISO/IEC 17417:2011(E)
9.2.2 Control Header Structure

After the symbol synchronization process using the Start Indicator completes, the control information shall be

transmitted in the Control Header. The format of the Control Header is specified in Figure 7, and the contents

of the Control Header are specified in Table 2. Reserved values shall not be used by a Sender. If a Recipient

receives a Control Header that uses a reserved value it shall discard the Frame.
Figure 7 — Control Header structure
© ISO/IEC 2011 – All rights reserved 11
---------------------- Page: 17 ----------------------
ISO/IEC 17417:2011(E)
Table 2 — Control Header contents
Field Name Description
Sender ID
Sender ID
Recipient ID
Recipient ID
0: Data frame
Frame Type
1: Visible frame
2-15: RFU
RFU
RFU
Length of Data Frame or Visible Frame,
Frame Length
from the start of the Control Header
through the end of the Frame, in bits.
0: No Ack/Nack
1: Nack
Ack/Nack
2: Ack
3-15: RFU
1: Recipient may transmit vi
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.