SWRA648 May   2019 CC1352P , CC1352R , CC1354P10 , CC1354R10 , CC2642R , CC2642R-Q1 , CC2652P , CC2652R , CC2652R7 , CC2652RB , CC2652RSIP

 

  1.   Bluetooth Low Energy Tree Structure Network
    1.     Trademarks
    2. 1 Introduction
    3. 2 Bluetooth Low Energy Basic Knowledge
    4. 3 Three Kinds of Bluetooth Low Energy Network Structure
      1. 3.1 Star Network
      2. 3.2 Mesh
      3. 3.3 Tree Structure Network
    5. 4 Bluetooth Low Energy Tree Structure Network Analysis
      1. 4.1 Role Analysis in Bluetooth Low Energy Tree Structure
      2. 4.2 Tree Structure Network Establishment Analysis
    6. 5 Bluetooth Low Energy Tree Structure Network Realization
      1. 5.1 Tree Structure Establishment
      2. 5.2 Role Differentiation in Tree Structure Network
      3. 5.3 Data Transmission in Tree Structure Network
    7. 6 Bluetooth Low Energy tree Structure Network Test
    8. 7 References

3.3 Tree Structure Network

The tree structure network consists of one grandpa node, several father nodes and several children nodes. Same as star networks, the grandpa node as root can communicate with the father nodes, and the father nodes can communicate with children nodes. Nodes on the same level (nodes of the same type) cannot directly communicate with each other and can only communicate by message forwarding.

Compared to mesh routing rules, the tree structure network routing rules are much simpler. This means the hardware and software requirements are lower than for a mesh network. This makes the tree structure network easier to achieve. Compared to the star network, the tree structure network can connect more nodes. It has more than one level of connection distance, so it has larger network coverage than the star network. The downside of the tree network is a higher latency when there are too many layers, and the network might be vulnerable if one of the father nodes is disconnected. For a real application the number of required nodes is given. Thus latency is predictable and acceptable. In this document a three layer networks is described.

tree-structure-network.pngFigure 3. Tree Structure Network