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Int. J. Communications, Network and System Sciences, 2011, 4, 626-629
doi:10.4236/ijcns.2011.410076 Published Online October 2011 (http://www.SciRP.org/journal/ijcns)
Copyright © 2011 SciRes. IJCNS
An Implementation Method for ZigBee Network Layer
Qiyong Pan1, Jin Wu2, Yihuai Wang2, Jingfei Ni2
1College of Physics & Electronic Engineering, Changshu Institute of Technology, Changshu, China
2School of Computer Science and Engineering, Changshu Institute of Technology, Changshu, China
Received June 21, 2011; revised July 25, 2011; accepted August 9, 2011
The basic functions and the relative concepts of ZigBee network are analyzed in this paper. The implementa-
tion method of ZigBee network layer is proposed, and then a algorism about how to built a Zigbee network is
defined. Finally, a experiment is simulated by prove the liveness of the Zigbee network, the result shows the
PC can get the monitored data from the Zigbee network.
Keywords: Zigbee Network, Aodvjr, Route Choosing, Route Finding
ZigBee [1-3] network layer support star, tree and mesh
topology structure. The tree structure and the network
structure is naturally the P2P network. In the star struc-
ture, there is a device called ZC (ZigBee Coordinator,
ZigBee) which is used to start up and maintain the de-
vices of the network, and the other devices just commu-
nicate with ZC.
The coverage range and communication distance is
relatively small. In the network and the tree structure
network, ZC [4-6] is responsible for starting up the net-
work and choosing the key network parameters, and the
coverage range of network can be extended by ZR. The
tree structure can be used in the beacon network de-
scribed by IEEE 802.15.4. In the tree structure, ZR
(ZigBee Router) uses the hierarchical routing strategy to
transfer the data and control information. The routing
algorism is routing the data to its father node or routing it
to its child node, but if one of the nodes have fault, the
communication between all the child nodes with the ex-
ternal nodes will be interrupt. So the robustness should
be considered in the tree structure network.
The communication methods of ZigBee have three
models, and they are unicast, broadcast and multicast.
The unicast data can just be transferred to some single
device. The broadcast data is transferred to all the de-
vices of the network. Multicast data is transferred to all
the devices to some group, which can be called groupcast.
Group is a notion in Zigbee, and a group is composed by
one or many devices, every group is using a group id to
be identified. In the Zigbee network, the location and
data transferring can be received and transferred, so
many devices can controlled in one operation.
2. The Frame Format
The network layer protocol data unit (NPDU) is organ-
ized by frame. There are two types of network, data
frame and network command frame.
The general network format is showed as Table 1. The
frame head is the same for the different types of frame
with the different frame load. Every frame has two parts
such as NWK header and NWK payload.
The format of network command frame is the same
with the general network frames, just giving the details
of frame load showed as Table 2. The network identifier
can divide the different network command.
3. ZigBee Network Routing Protocol
ZigBee network is a self-organization and self-healing
network with the characters of multi-leap, dynamics to-
pology, resource limit, taking the big challenge for the
design of algorism. The protocols can be classified to
table driven protocols, on-demand driven protocols and
blending routing showed as Figure 1.
4. Implementation of Network Layer
4.1. Building Network
ZigBee network can just be implemented by the device
having cooperative ability. The device is initialized to a
Q. Y. PAN ET AL. 627
Table 1. General frame format.
Bytes: 2 2 2 1 1 0/8 0/8 0/1 Variable
address Radius Sequence
control Route area
Table 2. Network co mmand frame format.
Bytes: 2 Variable length 1 Variable length
Frame control Route area Network frame identifier Network command load
Figure 1. Category of routing protocols.
ZigBee coordinator (ZC) after building the network. The
ZigBee network just has one ZC.
4.2. Adding Nodes to Network
When a device in the network admits a new device add-
ing to the network, the new adding node is the son device.
The first device is parent device. A son device can be
added to the network by the following ways: through the
MAC layer association process or the pre-appointed
parent device, it can be added to the network directly.
Moreover, isolated point device can be added or read to
the network by isolated point manner.
4.3. Sending or Receiving Data of Network
The Network layer transfer NPDU to the data service
entity of MAC layer, and request MAC layer sends
NPDU. MAC layer returns the data sending result to
The process of network layer receiving data is as fol-
lows: after the data frame received from MAC layer, the
network layer does validity check and examines whether
the destination address of the frame is accord with the
network address of the device. If the address matched,
then the frame will be send to the top layer to be man-
aged, otherwise, if the address is not matched and the
device has no route ability, the device network will query
the route table to choose the suitable next hop to do the
5. The Experiment Simulation
The experiment is implemented by using C#.NET. The
data management center receive, manage, save and dis-
play the sampling data of each monitoring nodes or send
the configuration and command information to them by
using the connected ZigBee Coordinator (ZC). It shows
the whole system structure by the way of graph structure,
and allows the users manage and maintain each monitor-
ing nodes. It also provides relevant query interface and
operation interface, for example query a node's real-time
data or historical data, set the sampling cycle etc.
In order to apply the ZigBee protocol stack in our
equipment monitoring system, we realize a simple ap-
plication above the Network layer of protocol stack,
which achieves automatic networking of nodes to reduce
the workload of the user.
5.1. The Graphical Display of System and User
The user interface for the software of data management
center is shown in Figure 2. The symbols in figure indi-
cate the type of the ZigBee nodes (the legends “C”, “R”,
“E” correspond to the type ZC, ZR, ZED), and distin-
guish them by different color. Click each node by the
right key of mouse, a right key menu appear which in-
cludes various functional operating sub-menu for this
node( such as “query and modify the equipment informa-
tion”, “query the real time data of equipment”, “query
the historical data of equipment”, “send relevant control-
opyright © 2011 SciRes. IJCNS
Q. Y. PAN ET AL.
Figure 2. The user interface of data management center in PC.
ling command to this equipment” etc.). When the mouse
stop above each node, a hints box come out to display
the simple information of this node.
5.2. The Analysis of the Experiment Result
Data management center can actually query and display
the data of single equipment monitoring node. As shown
in Figure 3, Three physical value such as temperature,
humidity and Motor speed etc are measured and dis-
played, which is distinguished by different color and can
be displayed in the same interface using different scale.
Being use the special data sampling interface board,
user can decide what physical value should be sampled,
and can add new physical value sampling sensor. Be-
cause ZigBee network has self-organizing and self-re-
covery features, equipment monitoring nodes can op-
tionally move within the network coverage. Therefore
user can freely decide what equipment’s information
should be sampled only by joining the equipment moni-
toring nodes with the monitoring equipment. The whole
system is customizable and with good scalability.
The reference model and the basic function are general-
Figure 3. The querying interface for real time data of equipment.
opyright © 2011 SciRes. IJCNS
Q. Y. PAN ET AL. 629
ized. The network frame type and the format definition
are given. The network building, adding node, data
sending and receiving are realized. Finally, after the
Zigbee network is built, and the Zigbee network is linked
to the PC to get the data or transmit the data, and the
experiment shows it has the good scalability and cus-
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opyright © 2011 SciRes. IJCNS