What is sXGP?

◆ TD-LTE-based wireless communication system, using unlicensed band 1.9GHz

※Unlicensed wireless band shared by PHS/DECT in Japan

Included in Band 39 (international frequency band of LTE defined by 3GPP)

◆ Private network that LTE is available (Private LTE)

◆ Expected as IoT wireless system as well as office cordless telephone use

◆ F1 and F2 were added in addition to F0 for co-existence of PHS/DECT

sXGP frequency band

1.2017: 5MHz in the 1.9GHz band (1896.6~1901.6MHz)

2.2020: 2 carriers were added (5MHz x 2: 1888.5~1893.5MHz, 1911.6~1916.6MHz)

3.Future: Consideration is underway to allocate one more carrier (5MHz)

※Being added one more channel (F3), 10MHz width (F21) can be utilized fully and the speed that used to be about ADSL will be doubled.

1.9 GHz band frequency allocation revision (proposed)


Source: from the 9th Handout of Digital Cordless Telephone Task Force, Land Wireless Communication Committee


The technical specification of sXGP uses TD-LTE system, which is part of the LTE standard for 4G (fourth generation) mobile phones. As it is the "Self-Organizing Network", the owner of buildings, factories can install and operate their own facilities and communicate and make phone calls on site. In addition to being used as an extension phone for businesses operating vast facilities, it is also expected to be used as a wireless communication infrastructure for IoT (Internet of Things), which promotes automation by linking sensor devices and control devices. In addition, sXGP can be used with existing smartphones, not specialized machines. It also can promote and contribute to digitalization and IoT of equipment by utilizing 4G high-speed and stable communication, deploying various sensors in factories and distribution centers and networking with sXGP.

What is the difference between sXGP and Private PHS?

sXGP is the successor to PHS which was enhanced with data communication and higher security. Private PHS service ended in January 2021, and telemetering services will end in March 2023. The scope of utilization of sXGP is from voice communication to current mobile data communication environments such as data utilization, video streaming and on-line conference.

While it was necessary to carry a table terminal for data communication in addition to a voice communication terminal in some cases of Private PHS, a smartphone can be used as a terminal instead, improving convenience and mobility for various purpose with sXGP.

The merit of Private LTE compared to Wi-Fi

1.Less radio interference

2.High mobility (smooth handover)

3.Ensuring security (high reliability based on SIM authentication method)

4.Double reachability and single base station of sXGP can cover four to five times of the area compared to Wi-Fi.

5.Perform error correction and retransmission control with advanced algorithms

6.High capacity (capacity of users) about twice that of Wi-Fi

Source: from Monthly Telecommunications Articles(Japanese only)

The merit of Private LTE compared to Public LTE

1.Cost effective

2.Little traffic congestion

3.Higher security

4.Able to keep certain data on site

5.Communication quality can be controlled (e.g., No worry about automatic driving in case of a disaster)

6.An LTE network can be provisioned even at the region where public LTE is difficult to be constructed (e.g., Hospitals/medical institutions, construction industry/construction sites, manufacturing industry)

Domestic demand for sXGP system

Characteristics such as high security by SIM authentication and not being easily affected by convergence of public LTE network

⇒ In addition to medical and nursing care fields like hospitals, various market sectors such as construction sites, transportation facilities, logistics, disaster prevention, electricity/gas/water supply industries showed their intention to use sXGP, so measures to deal with increasing demand (adding channels) are needed.


Source: from the 9th Handout of Digital Cordless Telephone Task Force, Land Wireless Communication Committee

Demand forecast (According to sales plans of members` of XGP Forum, etc.)

The demand forecast based on the past sales results and future sales plans, which aggregated responses from XGP Forum member companies, is as follows.

Regarding the results and plans until this year (2022), as the life-prolonging measure has been taken for the old spurious equipment for the time being by revision of Ministerial Ordinance, which had been planned to be valid until 11 April, the transition from private PHS to other systems including sXGP has been significantly delayed in major markets such as hospitals, while a portion of conventional private PHS demand is being replaced by sXGP system. We have started to receive orders for mechanical monitoring and control in certain factories and infrastructure fields which means sXGP is steadily spreading.

Source: from the 9th Handout of Digital Cordless Telephone Task Force, Land Wireless Communication Committee

More information about sXGP can be obtained from the member companies` website of XGP Forum.