ZigBee was born for IoT from the beginning. Initially, in order to provide the best standard for specific markets, the ZigBee Alliance designed a variety of different ZigBee protocols based on different application scenarios. With the development of the IoT market, different application protocols are adopted. Zigbee products cannot communicate with each other, and the fragmentation caused by these various protocols affects the product experience of consumers. In order to improve this sense of fragmentation and unify the original different protocols, ZigBee3.0 was officially launched.
Over the years, ZigBee has been continuously updated and iterated.
After ZigBee re-approved its ZigBee (07) specification, it defined two function sets of ZigBee and ZigBee Pro on the basis of its ZigBee (06), and the functions of ZigBee (07) in terms of network environment compatibility are based on this function set got strengthened.
Among them, in the public standard ZigBee (07) standard, the ZigBee function set includes:
Tree and mesh routing addressing;
And provide a specific randomly selected distance vector (AODV);
Also supports directional unicast, broadcast and group communication;
Enhanced data communication security, etc.
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ZigBeePro
ZigBee Pro no longer uses tree addressing, and replaces tree addressing with more convenient random addressing. It also adds threshold-limited broadcast addressing to support higher-level data security, but ZigBee The AODV (Ad hoc randomly selected distance vector) used with ZigBee Pro provides a many-to-one source routing scheme, so to a certain extent, it can be said that both feature sets can support the flexibility of selected objects. frequency and fragmentation.
ZigBee 3.0
The main purpose of ZigBee 3.0 is to unify the problems of the previous ZigBee protocol on different application layers. ZigBee 3.0 mainly solves the difficulty that different application layer protocols cannot communicate with each other. The imported ZigBee devices are unified when the devices are discovered, connected, and networked, making it more convenient for ZigBee devices to form a network, and further standardizing the ZigBee protocol.
And the ZigBee 3.0 software stack set provides a new solution for configuring nodes to join the network: consistent behavior, using a set of common configuration methods for ZigBee devices (including Touch Link), which is a configuration of adjacent nodes to access the network Methods. And both ZLL1.0 and ZHA1.2 support ZigBee 3.0. ZigBee (Smart Energy) is functionally compatible with ZigBee 3.0, but the additional condition is that it can only be processed in this Profile.
Program Diversity
Addressing method: ZigBee adopts ladder-type specified tree addressing, while ZigBee Pro uses random addressing. The two addressing methods have their own advantages and disadvantages. Tree-type specified addressing can avoid additional address conflicts, but the network range is relatively small. Small; random addressing can include nodes in large-scale networks, but the latency will be longer because ZigBee Pro takes time to resolve address conflicts. In addition, both ZigBee and ZigBee Pro support group addressing, but ZigBee Pro also supports wired broadcast addressing, reducing the extra load of network communication in large networks.
Specific On-demand Distance Vector (AODV): Both ZigBee and ZigBee Pro support AODV routing, but only ZigBee Pro supports the many-to-one source routing option. In the case of a larger communication protocol stack, the many-to-one source route can quickly establish a route. But for unrequired two-way, peer-to-peer (one-to-one) communication (lighting), many-to-one functionality is basically not applicable.
ZigBee 3.0 also adds proprietary protocols and application specifications on the basis of ZigBee and ZigBee Pro.
This means that any given network may only contain devices sold by a given company or group. This situation is especially common in medical fields where standard protocols are not currently defined and approved. Therefore, ZigBee will be used for mesh routing communication protocol, communication redundancy, and low power operation.
However, if the devices of different suppliers in the market must operate in a single cooperative network to perform specified services or functions, a specified standard protocol (Public Profile) must be adopted to ensure that all devices on the network use a common language and can communicate with each other , this type of interoperability means that Company A's product (the light switch) can communicate with Company B's product (the light ballast) without prior cooperation to ensure that the devices work together.
Advantages and disadvantages of ZigBee3.0
According to the official description, ZigBee3.0 standard has the following advantages compared with ZigBee1.2 standard: 1. Higher security; 2. Better stability; 3. Better compatibility; 4. , Lower power consumption.
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From the perspective of market applications, ZigBee 3.0 covers the widest range of device types, including home automation, lighting, energy management, smart home appliances, security devices, sensors and healthcare monitoring products. It supports both easy-to-use DIY equipment as well as professionally installed systems. Based on the IEEE 802.15.4 standard, the operating frequency is 2.4 GHz.
ZigBee 3.0 solves the problem of interconnection and interoperability of different application layer protocols of ZigBee, the most mainstream protocol in the field of smart home, and further standardizes the ZigBee protocol, which is a big step towards the interconnection of smart home.
Although ZigBee 3.0 cannot completely solve the problem of smart home interconnection, it can solve the problem of unification of application layer protocols. The emergence of ZigBee 3.0 is to unify ZigBee RS /HA/LL/BA/HC/TS and other application layer It is used to solve the interconnection and intercommunication problem between different application layer protocols. The ZigBee protocol has many application layer protocols, and different application layer protocols are independent of each other and do not communicate with each other. In addition, due to standardization issues, even if the application layer protocols are the same, they cannot achieve interconnection. The ZigBee Alliance also launched the ZigBee 3.0 certification to regulate the use of the standard ZigBee 3.0 protocol by various manufacturers.
Application Scenario
ZigBee 3.0 is already an indispensable and important role in smart home applications on the market. Ebyte E18 series is a typical small-sized 2.4GHz frequency band ZigBee wireless module, SMD type, IPEX interface, transmission power 100mW, pin spacing 1.27mm, suitable for a variety of application scenarios (especially smart home). The original CC2530 RF chip imported from Texas Instruments (TI) is used. The chip integrates 8051 single-chip microcomputer and wireless transceiver, and built-in PA+LNA, which greatly expands the communication distance and improves communication stability.
It can be widely used in various intelligent subsystems in smart homes: intelligent lighting control, intelligent temperature and humidity adjustment, intelligent cleaning and other systems. In addition, it can also be widely used in intelligent medical monitoring systems and smart city transportation systems.
