ARIB STD-T118

ENGLISH TRANSLATIONOFDMA/TDMA TDD FOR
DIGITAL CORDLESS TELEPHONE (sXGP)

ARIB STANDARD
ARIB STD-T118 Version 1.1

Version 1.0
Version 1.1

April 12, 2018
July 26, 2018

Association of Radio Industries and Businesses

General Notes to the English Translation of ARIB Standards
and Technical Reports
1. Notes on Copyright- The copyright of this document is ascribed to the Association of Radio Industries andBusinesses (ARIB).
- All rights reserved. No part of this document may be reproduced, stored in a retrieval
system or transmitted, in any form or by any means, without the prior written
permission of ARIB.
2. Notes on English Translation- ARIB Standards and Technical Reports are usually written in Japanese. This
document is a translation into English of the original document for the purpose of
convenience of users. If there are any discrepancies in the content, expressions, etc.
between the original document and this translated document, the original document
shall prevail.
- ARIB Standards and Technical Reports, in the original language, are made publicly
available through web posting. The original document of this translation may havebeen further revised and therefore users are encouraged to check the latest version at
an appropriate page under the following URL:
http://www.arib.or.jp/english/index.html.

ARIB STD-T118
Version 1.1

Foreword
The Association of Radio Industries and Businesses (ARIB) investigates and summarizes thebasic technical requirements for various radio systems in the form of “ARIB Standards”. Thesestandards are developed with the participation of and through discussions amongst radio
equipment
manufacturers,
telecommunication
operators,
broadcasting
equipment
manufacturers, broadcasters and users.
ARIB Standards include ”government technical regulations” (mandatory standard) that are
set for the purpose of encouraging effective use of frequency and preventing interference withother spectrum users, and ”private technical standards” (voluntary standards) that are definedin order to ensure compatibility and adequate quality of radio equipment and broadcasting
equipment as well as to offer greater convenience to radio equipment manufacturers,
telecommunication operators, broadcasting equipment manufacturers, broadcasters and users.
This ARIB Standard is developed for OFDMA/TDMA TDD FOR DIGITAL CORDLESSTELEPHONE (sXGP). In order to ensure fairness and transparency in the defining stage, thestandard was set by consensus at the ARIB Standard Assembly with the participation of both
domestic and foreign interested parties from radio equipment manufacturers, telecommunication
operators, broadcasting equipment manufacturers, broadcasters and users.
ARIB sincerely hopes that this ARIB Standard will be widely used by radio equipment
manufacturers, telecommunication operators, broadcasting equipment manufacturers,
broadcasters and users.
NOTE:
Although this ARIB Standard contains no specific reference to any Essential Industrial
Property Rights relating thereto, the holders of such Essential Industrial Property Rights state
to the effect that the rights listed in the Attachment 1 and 2, which are the Industrial Property
Rights relating to this standard, are held by the parties also listed therein, and that to the usersof this standard, in the case of Attachment 1, such holders shall not assert any rights and shallunconditionally grant a license to practice such Industrial Property Rights contained therein,
and in the case of Attachment 2, the holders shall grant, under reasonable terms and conditions,a non-exclusive and non-discriminatory license to practice the Industrial Property Rights
contained therein. However, this does not apply to anyone who uses this ARIB Standard and also
owns and lays claim to any other Essential Industrial Property Rights of which is covered inwhole or part in the contents of the provisions of this ARIB Standard.

ARIB STD-T118
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Attachment 1(N/A)(Selection of Option 1)

Attachment 2(Selection of Option 2)
Application
Remarks
number, etc.
Patent application
publication
JP
No. 2017-220953
Patent application
publication
JP
No. 2017-216738
Patent application
JP
No. 2017-165105
Patent application
JP
No. 2017-033362

Patent Applicant

Title of the Invention

KYOCERA
Corporation

Base station and radio communication
methodKYOCERA
Corporation

Communication equipment, communication
method, and communication system

OKI ElectricControl channel monitoring equipment,
Industry Co., Ltd. methods and programs, and base station
OKI ElectricControl channel monitoring equipment,
Industry Co., Ltd. methods and programs, and base station

ARIB STD-T118
Version 1.1

Contents
Foreword
Chapter 1: General Terms ................................................................................................................ 1
1.1

Overview ............................................................................................................................. 1

1.2

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

1.3

References ........................................................................................................................... 1

1.3.1

Normative References ................................................................................................. 1

Chapter 2: Standard System ............................................................................................................ 2
2.1

Overview of standard system............................................................................................ 2

2.2

Configuration of standard system .................................................................................... 2

2.2.1

BS ................................................................................................................................ 2

2.2.2

MS................................................................................................................................ 2

2.3

System type of standard system ....................................................................................... 2

2.3.1

1.4 MHz system .......................................................................................................... 2

2.3.2

5 MHz system ............................................................................................................. 2

Chapter 3: Technical Requirements for Radio Equipment ............................................................. 3
3.1

General conditions............................................................................................................. 3

3.1.1

Operating frequency ................................................................................................... 3

3.1.2

Type of radio waves and use ....................................................................................... 3

3.1.3

Interference prevention function ............................................................................... 3

3.1.4

Identification sign ....................................................................................................... 3

3.1.5

Communication method ............................................................................................. 4

3.1.6

Frame structure .......................................................................................................... 4

3.1.7

Cabinet ........................................................................................................................ 4

3.1.8

Carrier sense ............................................................................................................... 4

3.1.9

Protection of control channel in private PHS system ............................................... 5

3.1.10Interference avoidance ............................................................................................. 6

3.1.11

Failure detection ....................................................................................................... 6

3.1.12Finish of communications......................................................................................... 6

3.1.13

Radio wave name display on a MS........................................................................... 7

3.1.14

Inter-system synchronization................................................................................... 7

3.2

Requirements for transmitter........................................................................................... 7

3.2.1

Modulation method ..................................................................................................... 7

3.2.2

Frequency tolerance ................................................................................................... 7- i -ARIB STD-T118
Version 1.1

3.2.3

Permissible values for occupied bandwidth ............................................................... 7

3.2.4

Antenna power ............................................................................................................ 7

3.2.5

Tolerance of antenna power........................................................................................ 8

3.2.6

Absolute gain of antenna ............................................................................................ 8

3.2.7

Permissible values for unwanted emission intensity in the out-band domain ........ 8

3.2.8

Permissible values for unwanted emission intensity in the spurious domain......... 9

3.2.9

Carrier off time leakage power................................................................................... 9

3.2.10Conditions for radio wave transmission .................................................................... 9

3.2.11 Permissible values for Specific Absorption Rate on the human body (excluding thehead and both hands) ...................................................................................................... 9
3.2.12
3.3

Requirements for receiver ............................................................................................... 10

3.3.1
3.4

Permissible values for Specific Absorption Rate on the head ................................... 9
Limits on secondary radiated emissions, etc. .......................................................... 10

Connection with telecommunication lines ..................................................................... 10

Chapter 4: Methods of Measurement ............................................................................................. 11
Chapter 5: Systems for Interconnection ........................................................................................ 12
Appendix 1: Test Items related to Specified Radio Equipment .................................................... 13
Appendix 2: Operation Guidelines ................................................................................................. 14
Appendix 3: Compliance with Radiation Protection...................................................................... 18
Appendix 4: Management Methods for Identification Signs......................................................... 21- ii -

ARIB STD-T118
Version 1.1

Chapter 1: General Terms
1.1

Overview

This standard defines requirements for radio equipment used for OFDMA/TDMA TDD for
digital cordless telephone (hereinafter referred to as “sXGP* digital cordless telephone”)
prescribed in Article 49.8.2.3 of Ordinance Regulating Radio Equipment.
* sXGP: shared eXtended Global Platform

1.2

Scope

The standard defines the air interface for sXGP digital cordless telephone as shown in Figure
1-1.

MS

BS

Specified point

Figure 1-1

1.3

References

1.3.1

Normative References

Specified point for the air interface

The standard refers to the followings regulations.
RERL: Regulations for Enforcement of the Radio Law,
ORE: Ordinance Regulating Radio Equipment,
NT: Notification of the Ministry of Internal Affairs and Communications (issued in 2001 or
later), or the Ministry of Posts and Telecommunications (issued in 2000 or earlier),
OTRCC: Ordinance Concerning Technical Regulations Conformity Certification etc. ofSpecified Radio Equipment.

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Version 1.1

Chapter 2: Standard System
2.1

Overview of standard system

The sXGP digital cordless telephone system is that based on the TD-LTE system conforming
to 3GPP.

2.2

Configuration of standard system

The standard system for sXGP digital cordless telephone consists of BS and MS.

2.2.1

BS

BS is defined as a base station in 3GPP and mainly used at a fixed location.

2.2.2

MS

MS is defined as User Equipment (UE)in 3GPP and operated by instructions from a BS.

2.3

System type of standard system

2.3.1

1.4 MHz system

A 1.4 MHz system refers to the system in which BS and MS use a carrier with an occupied
bandwidth of 1.4 MHz.

2.3.2

5 MHz system

A 5 MHz system refers to the system in which BS and MS use a carrier with an occupied
bandwidth of 5 MHz.

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Chapter 3: Technical Requirements for Radio Equipment
3.1

General conditions

3.1.1

Operating frequency(RERL, Article 6)(NT, No.471, 2012, Appended Table No.8-6)

Operating frequency shall be as follows:a)for 1.4 MHz system: 1897.4 MHz, 1899.2 MHz, 1901.0 MHzb)

for 5 MHz system: 1899.1 MHz

3.1.2

Type of radio waves and use(NT, No.427, 2012)

The type of radio waves and use shall be as follows:
Type: X7D or X7W
Use: Control channel or traffic channel

3.1.3

Interference prevention function(RERL, Article 6.2)
(ORE, Article 9.4)

The radio equipment mainly used in the same premises has a function that can automaticallysend or receive an identification sign.

3.1.4

Identification sign

The identification sign shall be as follows:a) The length of identification sign shall be 24 bits or more for both BS and MS. The
identification sign of a BS shall be 5 or more-digit decimal number starting from 44190. The
identification sign of a MS shall be a decimal number starting from 44190, not exceeding 15digit number.
However, base stations for portable radio communication and broadband mobile radio
access systems and MS communicating with land mobile-relay stations or land mobile
stations (limited to the stations preforming radio communications by relay) may use theidentification signs managed by telecommunications carrier that establishes radio stations
for the portable radio communications and broadband mobile radio access systems concerned.
(NT, No.424, 1994)(NT, No.294, 2017)- 3 -ARIB STD-T118
Version 1.1b) The first 5 digits of the identification sign in decimal shall be treated as PLMN-ID(Public Land Mobile Network Identifier) specified in 3GPP.

3.1.5

Communication method(ORE, Article 49.8.2.3)

The communication method shall be as follows:a)Transmission from a BS to a MS: TDD combining OFDM and TDMb) Transmission from a MS to a BS: TDD combining OFDM and TDM, or TDD combining
SC-FDMA and TDM

3.1.6
a)

Frame structure
The structure of frame and sub-frame shall be as shown in Figure 3-1.
(NT, No.294, 2017)
Frame length 10 ms
Sub-frame
1 ms

D

S

Dp

G

U

Up

U

D

3.1.7

S

U

U

D

D: Downlink sub-frame
U: Uplink sub-frame
S: Special sub-frame

Dp: Downlink part
U: Uplink part
G: Guard time

Figure 3-1

b)D

Frame structure

The guard time in a special sub-frame shall be 643 µs or more.

Cabinet(ORE, Article 49.8.2.3)

The radio equipment excluding antenna shall be housed in a single cabinet, and the cabinet
shall not be opened easily.

3.1.8

Carrier sensea) It shall be possible to emit radio waves in the sub-frame used for the radio wave emission
only when the following reference level is satisfied by the received power measured in two
consecutive frames or more for the radio wave from any radio station in other systems- 4 -ARIB STD-T118
Version 1.1(hereinafter referred to “interference level”). For the case of (b), a BS shall allocate resources
to a MS after the carrier sense.
(a) System in which each BS and MS performs carrier sense
for 1.4 MHz system: -62 dBm or lower
for 5 MHz system:(b)-56 dBm or lower

System in which only MS performs carrier sense
for 1.4 MHz system: -68 dBm or lower
for 5 MHz system:-64 dBm or lower

When a MS or a MS is operated by reducing its maximum antenna power, the amount of
reduced power may be relaxed up to 20 dB from the above reference level. The carrier senselevel in this case shall be the level adding the amount of power reduced from the maximum
antenna power to the above reference level. However, a carrier sense level cannot be relaxedwhen a reduced amount of antenna power is compensated by the antenna gain in section
3.2.5.
(ORE, Article 49.8.2.3)(NT, No.294, 2017)(NT, No.424, 1994)b) The carrier with a minimum interference level shall be selected in the 1.4 MHz systemon a priority basis.
c) The interference level measurement shall use the maximum received power for thefrequency used for communications and in the occupied time, and employ the value
measured just before emitting a radio wave. In addition, the reception bandwidth formeasurement shall be equal to or more than the designed transmission bandwidth. For thesystem in which a BS only performs carrier sense, the interference level shall also use thevalue measured just before the emission in the case of resource allocation.
d) When MS without carrier sense and those with carrier sense are mixed in the same system,
the BS shall determine entirely by the reference level for the system in which only a BS
mentioned in the above a) (b) performs carrier sense.

3.1.9

Protection of control channel of private PHS systema) When a BS prepares to emit a radio wave, a received power is measured for the radio
wave for control channel (limited to 1,898.45 MHz and 1,900.25 MHz, hereinafter referred
to “private control channel”) radiated from a radio station for private PHS system. Thenthe radio wave shall be emitted only by determining no private control channel when themeasured power is below the following reference level.
for 1.4 MHz system:-75dBm or lessfor 5 MHz system:-82dBm or less- 5 -

ARIB STD-T118
Version 1.1

When a BS or a MS is operated by reducing its maximum antenna power, the amount of
reduced power may be relaxed up to 20 dB from the above reference level. The carrier senselevel in this case shall be the level adding the amount of power reduced from the maximum
antenna power to the above reference level. However, a carrier sense level cannot be relaxedwhen a reduced amount of antenna power is compensated by the antenna gain in section
3.2.6.
(ORE, Article 49.8.2.3)(NT, No.294, 2017)(NT, No.424, 1994)b) When a BS prepares to emit a radio wave, received power of a radio wave for a private
control channel shall be measured for the period corresponding to 300ms or more. Whenthe BS cannot determine the presence or absence of a private control channel, the unit shalldetermine the presence of the private control channel.
c) Received power of a wave for a private control channel is measured for the period
corresponding to 300 ms or more during operation once a day or more, and the existence ofthe private control channel shall be determined. However, the BS shall continue to use theprevious determination result when the existence cannot be determined due to theoverlapping radio waves from other radio stations. Continuous radio wave emission shallbe allowed during communication until the end of communication even if the presence ofprivate control channel is determined, on condition that a specialized vendor surveys inadvance based on section 5.3 in Operation guidelines (Appendix 2) at the time of radio
station installation, and operators are notified of the determination result of private control
channel existence by displaying it on the system in some way, etc.

3.1.10a)Interference avoidanceCommunication quality shall be monitored adequately during communication.

b)
When interference occurs during communication, it shall be possible to avoid
interference.
c)

3.1.11

Interference shall be avoided by changing resources allocated to a MS by a BS, etc.

Failure detection(ORE, Article 49.8.2.3)

When a radio wave is continuously radiated because of a radio equipment failure, the radiation
shall be automatically stopped.

3.1.12Finish of communications(ORE, Article 49.8.2.3)- 6 -ARIB STD-T118
Version 1.1

When operation for the finish of communication is performed on a MS side or the radio wave
for speech channel from a BS is not received, the radiation shall be stopped automatically.

3.1.13

Radio wave name display on a MS

When a MS with a display function is in a reception state, it is desirable that a radio wave
name on the MS displays the use of 1.9 GHz band sXGP system clearly.

3.1.14

Inter-system synchronization

When other sXGP system is adjacent to the own system and each frame is not synchronized, it
is desirable to match the frame synchronization timing each other between the systems in orderto reduce mutual interference.

3.2

Requirements for transmitter

3.2.1

Modulation method(ORE, Article 49.8.2.3)

The modulation method shall be as follows:a)

BS
BPSK, QPSK, 16QAM, 64QAM, or 256QAMb)

MS
BPSK, QPSK, 16QAM, or 64QAM

3.2.2

Frequency tolerance(ORE, Article 5, Appended Table No.1)

The frequency tolerance shall be 0.25 ppm.

3.2.3

Permissible values for occupied bandwidth(ORE, Article 6, Appended Table No.2)

a)for 1.4 MHz system: The permissible value for occupied bandwidth shall be 1.4 MHz.

b)for 5 MHz system:

3.2.4

The permissible value for occupied bandwidth shall be 5 MHz.

Antenna power(ORE, Article 49.8.2.3)

a)for 1.4 MHz system: The antenna power shall be 100 mw or less.

- 7 -ARIB STD-T118
Version 1.1b) for 5 MHz system: The antenna power shall be 200 mW or less for a BS, and 100 mw
or less for a MS, respectively.

3.2.5

Tolerance of antenna power(ORE, Article 14)

The tolerance of antenna power shall be within -47% (lower limit) to +87% (upper limit) for a
BS, and within -79% (lower limit) to +87% (upper limit) for a MS.

3.2.6

Absolute gain of antenna(ORE, Article 49.8.2.3)

The absolute gain of a transmit antenna shall be 4 dBi or less. However, when the equivalentisotropic radiated power is equal to or less than the value obtained by adding the maximum
antenna power to the antenna with 4 dBi absolute gain, the shortage can be compensated by theantenna gain.

3.2.7

Permissible values for unwanted emission intensity in the out-of-band domain(ORE, Article 7, Appended Table No.3)a) 1.4 MHz system
Frequency range

Unwanted emission intensity

0.7 MHz ~ 1.7 MHz detuning from a center frequency-13.7 dBm/30 kHz or less

1.7MHz ~ 3.2MHz detuning from a center frequency-10 dBm/MHz or less3.2MHz ~ 3.5MHz detuning from a center frequency-25 dBm/MHz or less

1895.040 ~ 1896.192MHZ and 1901.952 ~ 1903.104MHz-12 dBm/1.152 MHz or lessb) 5 MHz system
Frequency range

Unwanted emission intensity*

2.5MHz ~ 3.5MHz detuning from center frequency-15 dBm/30 kHz or less

3.5MHz ~ 6.1MHz detuning from a center frequency-10 dBm/MHz or less6.1MHz~ ~ 7.3MHz detuning from a center frequency-29（-13）dBm/MHz or less7.3MHz ~ 12.5MHz detuning from a center frequency-36（-25）dBm/MHz or less

1895.040 ~ 1896.192MHz and 1901.952 ~ 1903.104MHz-12 dBm/1.152 MHz or less

* The number in parentheses is a specified value for a MS.

- 8 -ARIB STD-T118
Version 1.1

3.2.8

Permissible value for unwanted emission intensity in the spurious domain(ORE, Article 7, Appended Table No.3)

The permissible value shall be -36 dBm/MHz or less.

3.2.9

Carrier off time leakage power(ORE, Article 49.8.2.3)

The carrier off time leakage power shall be 80 nW or less.

3.2.10Conditions for radio wave emission(ORE, Article 49.8.2.3)

A radio wave shall be emitted only when the identification sign specified in § 3.1.4 is stored.
Communications shall be connected by transmitting or receiving the relevant identification sign.

3.2.11

Permissible values for Specific Absorption Rate on the human body (excluding thehead and both hands)(ORE, Article 14.2)(OTRCC, Article 6 and 25, Appended table No.1)

Specific Absorption Rate (SAR)* on the human body (excluding the head and both hands) by aradio wave emitted from radio equipment (multiple radio waves; when radio waves are emitted
from other transmitters in the same cabinet at the same time) shall be 2 W/kg (4 W/kg in limbs)
or less. However, this provision shall not apply to the following radio equipment.
* SAR refers to the absorbed energy in any 10 grams of the human tissue exposed to anelectromagnetic field over 6 minutes divided by 10 grams and further divided 6 minutes. The
same shall apply hereinafter.
a) Radio equipment with the mean radiated power of 20 mW or less. In the case of multiple
radio wave emissions, the power corresponds to the sum of mean power.
b) Radio equipment used at a distance exceeding 20 cm between transmit antenna and thehuman body (excluding the head and both hands).

3.2.12

Permissible values for Specific Absorption Rate on the human head
(ORE, Article 14.2)(OTRCC, Article 6 and 25, Appended table No.1)

Specific Absorption Rate on the human head by a radio wave emitted from radio equipment(multiple radio waves; when radio waves are emitted from other transmitters in the same cabinet- 9 -ARIB STD-T118
Version 1.1

at the same time) shall be 2 W/kg or less. However, this provision shall not apply to the following
radio equipment.
a) Radio equipment with the mean radiated power of 20 mW or less. In the case of multiple
radio wave emissions, the power corresponds to the sum of mean power.
b) Radio equipment for a portable use, excluding that which transmits a radio wave near
the human head.

3.3

Requirements for receiver

3.3.1

Limits on secondary radiated emissions, etc.
(ORE, Article 24)

The limits on secondary radiated emissions, etc. shall be as follows:

3.4

a)

30 MHz ~ 1 GHz:

The mean power shall be 2 nW/100 kHz or less.

b)

1 GHz ~ 12.75 GHz:

The mean power shall be 20 nW/100 kHz or less.

Connection with telecommunication lines(Ordinance Concerning Terminal Facilities etc. Article 9)(NT No.424, 1994)

Radio equipment connected with telecommunication lines shall comply with the following
conditions.
a) Radio equipment between one part comprising terminal equipment and the other partshall have an identification sign with 24 bits or more.
b) Except for specific cases, communication channels shall be set only in an idle state of aradio wave to be used by determining whether the radio wave is available or not.
However, radio equipment to be used is not required to be accommodated in one cabinet.

- 10 -

ARIB STD-T118
Version 1.1

Chapter 4: Methods of Measurement
The methods of measurement shall be in accordance with the paragraph 1, item 1 (3) in the
OTRCC Appended Table No.1, or be equivalent to or better method than those. However, test
methods for items which are not specified in the above shall be based on commonly used methods.

- 11 -

ARIB STD-T118
Version 1.1

Chapter 5: System for interconnection
This standard does not specify protocols. The requirements for systems designed forinterconnection shall be in accordance with the latest version of the standard “sXGP (shared
XGP) Specification’” defined by XGP Forum.
When the provisions in the Specification overlap with those in Chapter 3 of this standard, therequirements shall conform to the standard.

- 12 -

ARIB STD-T118
Version 1.1

Appendix 1: Test Items related to Specified Radio Equipment(OTRCC, Attached Table No.1)(NT, No.88 2004, Attached/Annexed Table No.82)
The followings are test items related to technical regulations conformity certification of radio
equipment used for sXGP digital cordless telephone.
(1) Transmitter
Frequency deviation
Occupied frequency bandwidth
Spurious emission or unwanted emission intensity
Antenna power deviation
Power when carrier is not being transmitted
Specific Absorption Rate (SAR) (Note)
Note: Limited to the case where provisions in the text of ORE Article 14-2 paragraph (1)or (2) are applied to.

(2) Receiver
Limits on secondary radiated emission, etc.,(3) Other equipment
Carrier sense function- 13 -

ARIB STD-T118
Version 1.1

Appendix 2: Operation Guidelines
1

PurposeThis operation guidelines cover operations of radio stations for sGXP digital cordless telephonesystem using frequencies in the range from 1,893.5 MHz to 1,906.1 MHz (hereinafter referred toas “1.9 GHz band”). The purpose of the guidelines is to avoid harmful radio interference withradio stations using the same frequency band for TDMA narrow-band digital cordlesstelecommunications (hereinafter referred to as “PHS digital cordless telephone”), TDMA
broadband digital enhanced cordless telecommunications (hereinafter referred to as “DECT
digital cordless telephone”) and public PHS, and to ensure effective use of radio frequency andconvenience for users.
Here, harmful radio interference refers to causing continuous and serious damage to a functionof other radio equipment.

2

Scope of application

The operation guidelines apply to the radio station users and vendors engaged in the
manufacture, sales, implementation, operation and maintenance of radio stations (hereinafterreferred to as “specialized vendors”) for sXGP digital cordless telephone.

3

System covered by the operation guidelines
The operation guidelines apply to radio equipment used for sXGP digital cordless telephone.

4

Specification of issues

4.1

Operation manual

The operation manual for radio equipment used for sXGP digital cordless telephone shallcontain a caution notice as shown in the following text box and the meaning of product labelling
mentioned below.
The frequency band used by this radio equipment is also used by radio stations for different
types of digital cordless telephone including PHS radio station.
1

This device is designed so as to minimize the risk of radio interference with other radio
stations in the same frequency band, but in the event harmful radio interference with otherradio station occurs, the user of this device should stop operation immediately and contact
the service desk indicated below to discuss ways of avoiding radio interference (such as
installing partitions, etc.).

2

In case of any other problems, contact also the service desk indicated below:
Service desk:_______________________________________________________- 14 -

ARIB STD-T118
Version 1.1

4.2

Catalogs, brochures and websites

Catalogs, brochures, websites, etc. of the radio equipment for sXGP digital cordless telephoneshall describe a caution notice similar to that in the operation manual and the meaning of the
product labelling mentioned in section 4.3.

4.3

Product labelling

The BS used for sXGP digital cordless telephone shall indicate "1.9 GHz band radio station
type for digital cordless telephone" on the radio equipment body, using the abbreviated symbol
shown below.
If the indication cannot be placed on the radio equipment body due to restrictions on physicalsize, mounting form, or design, the same contents may be displayed by a sticker.
(This indication shall also apply to a MS if possible.)

1.9−S"1.9−": denotes the radio station for digital cordless telephone using the 1.9 GHz band.
"S": indicates the radio station type of digital cordless telephone (See section 4.3.1 for details).
Radio equipment accommodating more than one radio station types has a notation such as"P/S", which separates the symbol indicating the radio station type for digital cordless telephone
by a slash.

4.3.1

Radio station type for digital cordless telephone

Table Annex 2-1 shows the radio station type for digital cordless telephone covered by theoperation guidelines.

Table Annex 2-1

Radio station type for digital cordless telephone

Radio station

SymbolStandardsXGP digital cordless telephoneS

ARIB STD-T118

Table Annex 2-2 shows the type and symbol of other digital cordless telephone radio stations
using the same frequency band.

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ARIB STD-T118
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Table Annex 2-2

4.3.2

Radio station type for other digital cordless telephoneusing the same frequency band

Radio station

SymbolStandard

PHS digital cordless telephoneP

RCR STD-28

DECT digital cordless telephone

D

ARIB STD-T101

Indication methods, etc.

(1) Indication method
No particular specification. Indication method can adopt adhesive sticker use, printing on
equipment model nameplate, embossment on enclosure, electronic display or others.
(2) Size, aspect ratio, ground color, use of frame
No particular specification.
(3) Material
No particular specification. However, material should be resistant to peel-off and stain.
(4) Font, and color of letter or symbol
No particular specification. However, it should be easy to read and understand.

4.4

Packaging box"1.9 GHz band radio station type for digital cordless telephone" shall be indicated on an
individual packaging box for a BS of radio equipment in format similar to that of productlabelling. This provision does not apply to a packaging box intended for transport only.

5
5.1

Coordinated response
Cooperation for avoiding radio interference

If the radio station used for sXGP digital cordless telephone causes harmful radio interference
to other radio stations using the same frequency band, users and specialized vendors shallcooperate to avoid radio interference in good faith. At that time full attention shall be given to
the protection of the "PHS base stations and radio stations relaying communications between
PHS base stations and land mobile stations" in operation.

5.2

Priority of the existing radio stations

When a latecomer intends to establish a radio station for sXGP digital cordless telephone in
the areas where other radio stations using the same frequency band has been already operated
or where introduction of such radio station has been decided, the latecomer shall have theresponsibility for coordinating proper measures to avoid radio interference.

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5.3

Specialized vendors’ action

Specialized vendors shall conduct the following preliminary survey, when radio stations used
for sXGP digital cordless telephone are supplied.
(1) Measuring a received level of PHS control channel (limited to 1,898.45 MHz and 1900.25
MHz) and confirming that the level fully meet a carrier sense level.
(2) Trying a transition to a new control channel of the neighboring PHS digital cordlesstelephone when the level does not meet the carrier sense level.
(3) Examining operations by reducing maximum antenna power of a BS or a MS, andredesigning when the transition to the new control channel is difficult.
(4) Confirming presence or absence of a radio station for DECT digital cordless telephone, andtaking measures such as enough separation from the BS when the wireless unit exists. In
addition, explaining the possibility of interference to users.
(5) Avoiding sXGP system installation which cannot determine presence or absence of private
control channel by radio waves of other radio stations in the same system.

6

Influence on implantable medical devices

It is desirable to take appropriate actions in accordance with the "Guidelines for the preventionof influence by various types of radio equipment on implantable medical devices" in order toprevent influence on implantable medical devices.

7

Method for allocating International Mobile Subscriber Identity (IMSI)An International Mobile Subscriber Identity (IMSI) shall be a decimal number of up to 15 digits
composing of 3 digits for mobile country code (MCC: “441”), 2 digits for mobile network code
(MNC: “90”) and 9 or 10 digits for mobile subscription identification number (MSIN).
LAND MOBILE RADIO ASSOCIATION CORPORATION JAPAN administrates the IMSI
allocation, etc. (Refer to Appendix 4: Method for allocating IMSI).

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Appendix 3: Compliance with Radiation Protection
1

Safety facility for radio wave signal intensity(RERL, Article 21-3)

When radio equipment is installed at the place where radio wave signal intensity coming fromthe radio equipment exceeds the value shown in Table Annex 3-1, easy entering and exiting theplace shall not be allowed except for operators. Here, the radio wave signal intensity refers to theelectric field intensity, power flux density and magnetic field intensity (hereinafter the same),
and the place is limited to that where people get together, pass through, or come in and out.
However, this shall not apply to the radio equipment in the following radio station.
a)Radio equipment with mean power of 20 mW or lessb)

Mobile radio station equipmentc) Radio equipment for temporary established radio stations in the case of emergency suchas earthquake, typhoon, flood, tsunami, snow damage, fire, riot and others(RERL, Attached Table 2-3-2)
Table Annex 3-1

2

Reference value of the electromagnetic field intensity (Re: RERL, Article 21-3-6)

Frequency

Electric field
intensity (V/m)

Magnetic field
intensity (A/m)

Power flux
density (mW/cm2)

Average time(minute)Exceeding 1.5 GHz
and 300 GHz or less

61.4

0.163

1

6

Calculation method for radio wave signal intensity radiated from radio equipment(NT, No.300, 1999)

The power flux density is calculated by the following equation for evaluating radio wave signal
intensity radiated from radio equipment. Calculations are made at each point with at least λ/10[m] intervals from the transmitting antenna position in the horizontal direction and at positions
with at least 10 cm intervals from the range of 10 cm to 200 cm above the ground in the verticaldirection, and the maximum value is obtained. However, each calculation point must be at least
10 cm away from the transmitting antenna and a metal object.
S = (PG) / (40πR2) x K
Here,(1) S: Power flux density [mW/cm2](2) P: Antenna input power [W] (Transmission output minus feeder loss & mismatching loss)
Note: For a pulse wave, time average value of antenna input power is used.
(3) G: Power ratio of absolute gain of transmit antenna in the maximum radiation direction- 18 -

ARIB STD-T118
Version 1.1(4) R: Distance between an antenna and a calculation point [m](5) K: Reflection coefficienta) K = 2.56: taking account of the refection from the groundb) K = 4: taking account of the refection from other than the ground such as water surfacec) K = 1: taking account of no reflection

3

Certification of compliance with the standard value of radio wave signal intensity

Table Annex 3-2 shows the parameters of radio station for OFDMA/TDMA TDD broadband
digital cordless telephone.
Table Annex 3-2 Parameters of radio station for OFDMA/TDMA TDD
broadband digital cordless telephone
Antenna power

Antenna gain

Power ratio of antenna gain

200 mW (maximum)

4 dBi

2.51

In the radio station for OFDMA/TDMA TDD digital cordless telephone, time average value ofantenna input power being a pulse wave may be used. However, the maximum value of 200 mW
is applied for the certification of compliance. Since there is no need to consider the reflection fromthe ground, the power flux density S radiated from radio equipment is given by the following.
S = (PGK) / (40πR2) = (0.2*2.51*1) / (40π*0.1*0.1) = 0.399 [mW/cm2]
The calculated result conforms to the permissible value of radio wave signal intensity (1mW/cm2) shown in Table Annex 3-1.
When more than one radio waves from other radio equipment accommodated in the samecabinet are emitted simultaneously, the sum of ratio of power flux density to the reference value
shall be calculated. If the sum does not exceed 1, the power flux density can be considered to becompliant with the permissible value.
For example, in the case of radio equipment including a radio station A for OFDMA/TDMA
TDD digital cordless telephone and a radio station B for Low power data communication systemin the same cabinet, the power flux density of the radio station A is set SA and the reference value
is set S1, and the power flux density of the radio station B is set SB and the reference value is set
S2. Then the calculation is made as follows:(SA / S1) + (SB / S2) ≦ 1
In the case of being accommodated with a radio station for 2.4 GHz Low power data
communication system together, it is considered that the power flux density of the low power
data communication system does not exceed 0.601 (mW/cm2) by the above expression. According
to the power flux density formula, the power flux density can be considered to be compliant withthe permissible value when the equivalent isotropic radiated power of that system does notexceed 0.755 (W).

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Setting of system parameters should be considered to comply with the radio wave protection
guidelines in accordance with the operation mode of the radio station for OFDMA/TDMA TDD
digital cordless telephone. When they are not compatible, a countermeasure such as establishingsafety facilities is required.

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Appendix 4: Management Methods for Identification Signs
This appendix describes management methods for identification signs used for MS of sXGP
digital cordless telephone as a guideline.
A part of the number zone assigned to telecommunication carries, etc. based on the Regulations
for Telecommunications Numbers (MIC Ordinance) is allocated to the identification sign used for
MS of sXGP digital cordless telephone, which is a decimal number starting from 44190 less than
15-digit number (MIC Notification No.294, 2017). Therefore, the effective use of identification
signs in accordance with the regulations is required.
LAND MOBILE RADIO ASSOCIATION CORPORATION JAPAN (hereinafter referred to as“RMK”) examines whether or not an applicant can manage identification signs in accordancewith the regulations and issues identification signs. It is desirable that the applicant organizes
a method for managing identification signs in advance from the following point of view andprepares the explanation document.
This explanation document should be submitted in the case of the first application or changeof the management method.

(1) Management methods for identification signs
Identification signs shall be managed as follows:a) When a SIM card storing identification signs is issued to a user, the identification signs
shall be set additionally to a managing system which identifies MS without delay.
b) When the above SIM card is lost or damaged, or the use of the relevant SIM card is
discontinued, identification signs stored in the managing system which identifies MS are
set to be deleted without delay.
c)

The identification signs deleted in the above process shall be reusable for a different SIM.

(2) Management for reporting utilization status of identification signs
The utilization status of the designated identification signs shall be collected on a regularbasis. Then it can be confirmed that the signs are unused for a long period of time actually.
In addition, the volume of usable identification signs shall be managed so that a sequential
report can be made at the request of RMK.

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ARIB STD-T118
Version 1.1[Reference] Method for obtaining identification sign (IMSI)RMK has started to issue identification signs since May 1, 2018. Application procedures havesome different parts from those for the existing digital cordless telephone (e.g. private PHS, etc.).
In order to prevent an applicant from being confused at the time of the application, the current
application procedures are introduced below (RMK’s documents are described as a reference,
because they may change).
As described in this standard “Appendix 2, Paragraph 7: Method for allocating International
Mobile Subscriber Identity (IMSI), an applicant inquires RMK (main office) about the issue ofidentification signs and then can acquire an application form. An application fee should be
confirmed because the fee is different between RMK members and non-members.
The following two documents are required for the application.
(1) Request for the grant of identification signs (Document sent from RMK)
Entry items and method are shown below.
- Type- Manufacture’s name or user’s name
- Desired number of radio equipment
to be granted- Equipment type or name: Fill in “Radio equipment used for MS of
OFDMA/TDMA TDD digital cordless telephone: Fill in an applicant name, etc.
: Fill in the required number of identification signs
Up to 50,000 units per application: No description needed for sXGP system(2) Document explaining management methods for identification signs in the corporation (Freeformat)See items related to the management methods for identification signs in the previous pagefor document preparation.
RMK issues the following document after examining the above submitted document. Thenthe applicant obtains identification signs.
(1) Certificate of designation for identification numbers (Issued by RMK)
The identification signs allocated by RMK are issued by the certificate of designation for
identification numbers. Described items and contents are as follows.
- Designated person- Type- Equipment type and name
- Designated identification number-Designated date

: Name of applicant: Radio equipment used for MS of
OFDMA/TDMA TDD digital cordless telephone: Not described for sXGP
: Granted numbers are described.
: Date of issue- 22 -

OFDMA/TDMA TDD
for digital cordless telephone(sXGP)
ARIB STANDARD
ARIB STD-T118 VERSION 1.1(July 26, 2018)
Published by
Association of Radio Industries and Businesses
11F, Nittochi Building
1-4-1 Kasumigaseki, Chiyoda-ku, Tokyo 100-0013, JapanTEL 81-3-5510-8590
FAX 81-3-3592-1103
Printed in JapanAll rights reserved