Page 289 - ITU-T Focus Group IMT-2020 Deliverables

ITU-T Focus Group IMT-2020 Deliverables 4

10.2.6 Flow Control

Since our solution directly transfers HTTP requests and responses over the ICN, it implements its own
lightweight transport protocol in order to support possible multicast delivery of responses in a flow controlled
manner. Due to the possibility to run TCP services that are not HTTP applications over the solution – these
services will then be transmitted via an IP-over-ICN solution that works similar to the described HTTP one –
our lightweight HTTP transport protocol is TCP.

10.3 ICN transport for mmWave Networks (KDDI)
Sony and Tokyo Tech had previously developed experimental 60 GHz wireless complementary metal–oxide–
semiconductor (CMOS) large-scale integrated circuits (LSIs) that operated with a data rate of 6.3 Gbps in the
physical (PHY) layer in 2012 (Sony and Tokyo Tech 2012). Now, they have developed a 60 GHz wireless
module with high frequency usage efficiency, i.e., a data rate of 6.57 Gbps in the PHY layer that uses a
2.16 GHz bandwidth, based on the use of a 6 dBi slab-waveguide antenna (developed by Ando-Hirokawa Labs
at Tokyo Tech), a 65 nm CMOS 60 GHz direct-conversion radio-frequency (RF) LSI and analog circuit with
40 nm CMOS process that includes a 2.3 GSample/s 7-bit analog-to-digital converter (developed by
Matsuzawa-Okada Labs at Tokyo Tech), and a 40 nm CMOS baseband (BB) LSI that incorporates a media-
access control (MAC) layer and PHY layer that uses the above analog circuit and rate-compatible low-density
8
parity-check (LDPC) codes with code rates of 14/15 and 11/15 (developed by Sony). The design of this 60
9
GHz wireless module is based on the first draft of the IEEE802.15.3e standard. They also developed a file
transfer system with a high cache memory capacity that can be accessed directly from the wireless module
with very high throughput. A 60 GHz wireless transfer system using the developed wireless module and file
transfer system demonstrated the world’s fastest user data rate of 6.1 Gbps (which can transfer a 1 GB file
in 1.3 s). The system enables users to receive large quantities of data in moments, without the low data
throughput limitations of current commercial mobile devices.

Figure 24 – Photographs of a 60 GHz 6.1 Gpbs wireless module (left) and of experimental
setup for wireless transfer of files to a smartphone (right)

We have established an actual system that allows multiple wireless systems (hereafter called the GATE
systems) installed adjacently each other to be operated independently without interference to demonstrate
the high throughput and spatial isolation abilities of the 60 GHz wave-based wireless devices, e.g., a ticket
gate at a train station.

8 Rate-compatible LDPC codes are LDPC codes that were designed to enable decoding using a single decoder.
9 IEEE 802.15.3e is the next-generation 60 GHz wave-based wireless communication standard with a maximum PHY
data rate of 100 Gbps and a maximum link-set-up time of less than 2 ms, and is currently being discussed.

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