Page 117 - Kaleidoscope Academic Conference Proceedings 2020

Industry-driven digital transformation

compressed by the EHC protocol. The padding (PAD) is not bring about great changes to the whole society through
compressed by the EHC protocol. The EHC compressor and URLLC services such as automatic driving, factory
the EHC decompressor store original header field automation and smart grid. Based on the present, the research
information as an "EHC context". Each EHC context is in the 3GPP R16 is about to end. At this stage, the research
identified by a unique identifier, called Context ID (CID). in related high-level technologies has laid a solid foundation
For an Ethernet packet stream, the EHC compressor for the integration of 5G and IIoT. With the development of
establishes the EHC context and associates it with the CID. IIoT, its services require more strict delay and is more
Then, the EHC compressor transmits the "Full Header (FH)" deterministic, for example, up to 99.999 999%. To this end,
packet to the EHC decompressor including the associated 3GPP Rel-17 has launched a research on standard
CID. The EHC compressor keeps transmitting the FH technology to further enhance the delay and reliability, so
packets until the EHC feedback is received from the EHC that 5G can meet the various needs of the development of
decompressor. IIoT.

Considering the directions of the reliable private network of
PREAMBLE
local service optimization, extensible wireless connections
START OF FRAME DELIMITER (SFD) of future platforms, and multiple functions of new cases, a
shorter frame structure is selected in accordance with service
DESTINATION ADDRESS development requirements to reduce the air interface delay
of services. In addition, deep integration with the TSN
SOURCE ADDRESS Compressed proposed by the industry is also considered to guarantee low

by EHC transmission delay of services. On the road of the integration
802.1Q TAG (optional) of 5G and industrial Internet TSN, related enhancements will
be carried out in the following aspects: 1) On the basis of
LENGTH/TYPE
multi-carrier deployment, the reliability is further improved
by introducing a PDCP layer and higher-level data
PAYLOAD (+PAD) replication transmission technology. 2) The feedback
scheme for the physical layer will be further enhanced. 3)
The UE service priority and uplink UCI will be enhanced. 4)
FRAME CHECK SEQUENCE (FCS) Licensed, shared and license-free spectrum: With the NR-U,
the 5G NR will support the licensed frequency, shared
EXTENSION
frequency domain and license-free spectrum. 5) URLLC:
low latency, high reliability, and multi-TRP cooperation. 6)
Figure 2 - Ethernet packet format Enhanced mobility. 7) Wireless replacement of wired bus. 8)
Positioning: based on network and equipment requirements,
The source MAC address, destination MAC address and type IIoT requirements, and intelligent factory/V2X (Vehicle to
fields of the Ethernet header frame are all static and can be everything) centimeter positioning requirements. 9) With the
compressed, which is also the conclusion of the 3GPP RAN2. penetration of artificial intelligence (AI) technology,
Header compression is essentially the use of CID instead of exploring the new deterministic requirements and key
Ethernet headers for transmission in the communication standard technology of AI in IIoT applications. These will be
network. the key direction in the future.

The compression process includes: 1) The configuration of 4. IIOT APPLICATION IN DIGITAL TWINS
the CID is completed by the PDCP data PDU. 2) The
compressor sends a full packet containing the full header and With the continuous development of the manufacturing
the CID. 3) The decompressor establishes the relationship industry, digital twins have become the focus of every digital
between the header and the CID according to the received enterprise, although they have not yet become the
FH packet. 4) After the decompressor successfully mainstream technology. The core of digital twins is model
establishes the context relationship, it sends the feedback and data, but the creation of virtual models and data analysis
message with the CID, informing the compressor that it can require professional knowledge. For those who do not have
send the compression package. 5) After receiving the relevant knowledge, it is a long way to go to build and use
feedback information carrying CID, the compressor starts to digital twins. IIoT can just solve the above problems, through
send the compression packet corresponding to the CID. The the platform to achieve data analysis outsourcing, model
header field in the compression packet is replaced by the CID, sharing and other services. For example, using the IIoT to
where the feedback information is sent by PDU control associate the edge-side infrastructure downward with the
PDCP. digital twin, and to transfer and store data upward in the
cloud. Other users can also establish digital twins through the
3. FUTURE RESEARCH IIOT TECHNOLOGY services of the platform according to their own needs. It can
be said that the industrial Internet platform activates the life
As a breakthrough in the integration of mobile of digital twins.
communications and vertical industries, 5G is expected to

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