ISO/IEC 29157:2015 情報技術—システム間の電気通信と情報交換—ISM帯域の短距離無線低レートアプリケーションのPHY / MAC仕様 | ページ 2

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.

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The committee responsible for this document is ISO/IEC JTC 1, Information technology, SC 6, Telecommunications and information exchange between systems.

This second edition cancels and replaces the first edition (ISO/IEC 29157:2010), which has been technically revised.

Introduction

This International Standard is the revision of ISO/IEC 29157. This International Standard was established to provide a unified platform for services of data rates up to 1 Mbps: control data, voice, audio, and video. The purpose of the revision is to accommodate the advancement of technology for higher-quality services in the mobile applications.

The direction of the revision is three-fold: to enhance throughput, to facilitate co-existence with other technologies such as time-division LTE (long term evolution) and WiMAX II, and to increase data rate. For the higher throughput, the length of the preamble of the payload frames is made variable up to the user’s need (see 9.2.2). For the co-existence, the duration of the middle frames is reduced to 4 ms from 16 ms to make align with those of the other technologies (see 8.3). With the shorter middleframes, the International Standard does not only harmonise with other technologies, but also attains advantages of shorter communication delay and less paring time. To increase the data rate, the message part of the payload frames may be modulated with QPSK. The modulation format is indicated by the ‘PHY version’ of the header (see Clause 7 and 9.3). With the addition of the new option, the data rate can be increased to 2 Mbps. In addition, to protect communications against security challenges due to the loss of protection provided by wires, this International Standard provides the optional security mechanism (See 9.3.2 and Annex A).

1 Scope

This International Standard specifies the PHY characteristics and MAC procedures used for short-range, low-data-rate, wireless communications with very low latency and point-to-multipoint connection capability.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.