Abstract: In recent years, the digitalization of the park has been evolving, from the informatization construction of single system such as OA, CA, BA, SA and FA, to the application-oriented large-scale system integration, to the construction of data open platform based on cloud and big data, and then to the era of full data fusion and ubiquitous digital technology.

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In recent years, the digitalization of the park has been evolving, from the informatization construction of single system such as OA, CA, BA, SA and FA, to the application-oriented large-scale system integration, to the construction of data open platform based on cloud and big data, and then to the era of full data fusion and ubiquitous digital technology. With the evolution of technology, the dependence on data collection, data opening and data sharing becomes more and more profound, and connection is the basis of data acquisition.

Connection problem has become a huge resistance to digital transformation of the park

Huawei has taken the lead in smart exploration with its own internal campus as the experimental field. In the process of construction, 38 types of subsystem terminal devices have been connected, in the process of system linkage difficulties, complex protocols, data inconsistency and a series of problems…

  • Each subsystem is independent, and data sharing and application integration are difficult: Each subsystem forms information islands, and application protocols are diversified and privatized. BACnet, Modbus, M-BUS, DTL645, ZigBee, IEC104, OPC and other protocols are numerous, which leads to the need for a lot of customization for system integration. At the same time, the interfaces and services that each subsystem can open to the outside world are very limited, and it is difficult to fully share data, which seriously hinders the innovation of data-based converged business.

  • The old connection technology has many cables, high operation and maintenance costs, and low communication efficiency: each subsystem has an independent small network, including a large number of non-IP cables. Once failure occurs, it is extremely difficult to remove obstacles. There is a growing tension between these older technologies, which communicate inefficiently, and innovative applications that rely on large volumes of data and real-time interaction.

The connection status of traditional park southward system

In view of the above problems, there are two ways to solve them:

Mode 1: Deploy a protocol conversion gateway at the edge. The gateway supports the interconnection of various southbound system protocols and converts these protocols into the southbound standard interfaces and service models of the digital platform in the campus. In this way, data is integrated through the digital platform and unified service interfaces are provided for upper-layer applications.

Mode 2: Directly interconnect with each campus system on the southbound system adaptation layer of the digital platform, and then adapt and convert the service application interfaces of each system to provide unified service interfaces for upper-layer applications.

Two current southbound system integration connection schemes

However, the current two solutions still have some shortcomings:

  • In mode 1, there are many problems, such as a large number of system buses, high maintenance cost, old system bus technology, low communication bandwidth, and long delay.

  • As for mode 2: each business subsystem is still vertically constructed, and the digital platform of the park connects with the interfaces of each closed subsystem. These interfaces provide limited open capacity and cannot achieve accurate control and efficient linkage of subsystem devices.

The digital development of the park is “difficult”, which can be easily handled by the four modules of Huawei intelligent connection architecture

Huawei smart connectivity solution for the smart park provides a southbound device access and interconnection platform for the park, overcoming the shortcomings of the above two solutions. The new scheme adopts the end-to-end cloud collaborative architecture. IP transformation and standardization transformation start from the end-to-end devices, deconstruct the southward system of the park, decouple the application and equipment, and completely break the closed and disconnected problem of the vertical chimney system. Based on this solution, hardware developers can quickly build intelligent hardware with low cost and low threshold, and shorten the product launch cycle. Based on this solution, application developers can obtain data of all devices in the south of the park, and develop innovative solutions in various scenarios through data analysis, situational awareness, and strategic linkage.

Huawei Intelligent connectivity solution architecture for smart parks

L Link(D) : SDK software and reference implementation for integrated development of intelligent connection terminal, including the following functions:

1. WIFI, ETH, PLC, RF and other network access technologies provide terminals with fast, reliable and safe network connection;

2, plug and play, touch the network that connect, realize the terminal to the edge gateway of high performance, high reliability, encryption connection;

3. Operation and maintenance diagnosis, providing local operation and maintenance, remote operation and diagnosis capabilities;

4. Open interface, standardize intelligent terminal return protocol, standardize terminal data format, policy specifications, etc., and provide unified and open TERMINAL device integration and development API interface;

L Link(G) : Intelligent terminal device access gateway deployed at the edge of the campus, which provides the following functions:

1. Terminal device management, including terminal device access authentication, encrypted channel negotiation, terminal device certificate management, terminal status monitoring, terminal operation and maintenance diagnosis;

2. Device shadow management, providing device model analysis, device data cache, device command forwarding and other functions;

3. Business edge autonomy and closed-loop, providing local management console, local control logic arrangement, message forwarding linkage, etc.;

4. Protocol conversion and adaptation, providing IoT platform access adaptation, extension protocol adaptation conversion, object model conversion, etc.;

L Link(C) : device access, object model definition, implementation tools, etc. deployed on digital platform, including:

1. Provide access management capability of massive devices in the park, including access management of gateway devices and access management of gateway sub-devices;

2. Provide application tools for intelligent connection equipment from deployment planning to deployment implementation to operation and maintenance;

3. Provide intelligent equipment management and configuration application services;

4. Provide standard equipment models, equipment data and intelligent services;

L Link(APP) : smartlink device management software installed on the mobile terminal, providing the following functions:

1. Unified account login on cloud platform, and information synchronization (download and upload) of cloud equipment and facilities;

2, Support bluetooth connection to smart devices, support administrator authentication and encryption management channel;

3. Deployment and deployment of smartlink equipment, scan code deployment, network parameter setting, local service commissioning and other functions;

4. Local maintenance, firmware upgrade, certificate update, log collection, online diagnosis, etc.;

Multiple roles can be easily connected to quickly realize the digital transformation of the park system

Huawei intelligent connectivity solutions for smart parks provide open platforms, interfaces and tools at the end, side, and cloud levels for system equipment vendors, system service providers, system application developers, and system integrators to the south of the park. Based on Huawei’s intelligent connection solution technology, it can realize the rapid construction of intelligent connection terminals, complete decoupling of equipment and applications, and complete interconnection of multi-manufacturer systems within the intelligent connection ecosystem, and ultimately help customers quickly realize the digital transformation of the park system.

Reconstruction and development of southward system in the park

Terminal module provider: according to the standard hardware interface defined in the scheme, develop and provide intelligent connection terminal module. The module refers to the adaptation interface provided by Link SDK to realize the pre-integration of Link SDK. Equipment suppliers can obtain Link’s connection capability after purchasing intelligent connection module.

Terminal device provider: provides intelligent connected terminal devices in line with Link specifications, ADAPTS terminal business software based on THE API interface of Link SDK, and provides functions such as reliable connection, deployment, operation and maintenance diagnosis.

System application provider: Based on the open Restful interfaces provided by Link(G) and Link(C) and with reference to the unified and standardized object model defined by Huawei Intelligent Connection solution, the development of cloud side and side application is realized.

System integration service provider: according to customer requirements of actual projects, it can flexibly choose ecological equipment and system application of Huawei intelligent connection solution to realize equipment interconnection of any ecological manufacturer. At the same time, based on the configuration development tool and control logic arrangement tool provided by the scheme, the project group state customized development can be realized, the field control logic without code programming, to meet the needs of customers in specific projects.

Digital transformation practice of building automatic control system in park based on Huawei intelligent connection scheme

Project background

The existing building control system of a Huawei park has been under construction for 20 years, and has the following problems:

  • High maintenance costs: Multiple brands and versions coexist, and the monitoring and management systems need to be built repeatedly. For example, there are XX BA central control rooms and XX sets of BA systems (group control, building control, electric energy and lighting) in 11 blocks of a park. High maintenance costs: system construction and operation and maintenance costs are high, policy adjustment requires manufacturers to provide door-to-door services, the cost of person per day is more than XXXX yuan, a park site maintenance service XXX million/year.

  • Low operational efficiency: Scattered operating platforms lead to difficult personnel management. The automatic control system is not “automatic”, relying on human operation, heavily dependent on the experience of engineers, responsibility, poor sustainability.

  • Energy waste: HVAC accounts for 40~50% of building energy consumption, lighting accounts for 18% of the entire building energy consumption, but the air-conditioning system can not be adjusted according to the weather temperature in real time to save energy, resulting in about 30% of energy waste.

Digital transformation scheme

1. Based on LinkSDK and module, partners quickly build IP-based DDC and VAV terminals on zero basis, providing WIFI, PLC and other uplink communication interfaces;

2. Based on the open interface of Link(G) and edge computing platform of AR502H, the partner developed edge building control and edge configuration software, which was installed and deployed on AR502H together with Link(G) to provide the function of edge gateway of building control;

3. Based on the control logic programming tool and configuration development tool suite provided by Link(C), the building automatic control cloud application was rapidly built within three months;

4. Use Link OPERATION and maintenance APP to realize terminal device plug and play deployment online, diagnosis and maintenance online operation and maintenance;

5. During the implementation of the project planning, the existing WIFI network in the park is directly utilized to realize automatic identification, authentication and QoS service guarantee of WIFI uplink DDC through iot sensing network technology. For the old system that has deployed twisted-pair, the old twisted-pair resource is utilized to realize the order of magnitude improvement of transmission efficiency through PLC-iot technology, and provide more real-time data acquisition and control services.

Reconstruction scheme of building automatic control system

Digital transformation achievements

1. Low cost and high efficiency of transformation and upgrading: brand compatibility, benefit old live network system (including sensor/actuator), only transformation/new field controller. Using the existing network twisted-pair, no rewiring, through PLC-iot network upgrade. In the area without wired network, the device can be quickly online through WIFI connection and plug and play.

2. Unified monitoring and maintenance: unified facility management platform to achieve cross-regional and cross-brand unified management and reduce operating costs. The facility management mode based on land plot is changed into a unified management mode, and management units are set based on permissions to break the limitations of space and manufacturers and simplify management.

Unified monitoring and maintenance of equipment and facilities

3. Energy saving effect of continuous operation: BA equipment is dynamically optimized according to the parameters such as weather temperature and humidity, indoor temperature, real-time number of people, light intensity, thermal calculation of personnel, cold quantity prediction, etc. Bright operation sensors are installed in public areas to control air conditioning and lighting, and the overall energy efficiency is optimized to save 10% on average.

Energy efficiency tuning application solution

The future has come, let’s look forward to it together

In recent years, various connection technologies have developed rapidly, and plC-iot, WIFI6, POL, NB-iot, 5G and many other connection technologies have emerged. No matter how the connection technology evolves, IP is the inevitable trend of the campus network, and the old network technology will be replaced. With the evolution of IP equipment in the park, unified connection, unified service model, network interconnection and data sharing are inevitable trends. The deep integration of man-machine, material and things in the park and the artificial intelligence technology based on big data will accelerate the evolution of the park to intelligence.

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