1. Multi-channel Wireless Sensor Network MAC protocol based on dynamic route

2. Out Line  Introduction of multi WSN and MAC protocol  Dynamic route multi-channel MAC protocol.  Step to apply Step to apply Dynamic McMAC protocol.  Simulation Result.

3. Introduction  Wireless sensor network (WSN): define as a group of spatially dispersed and dedicated sensors for monitoring and capturing information from an environment, processing data and transmitting them via radio signals.  usually work together to achieve specific task.  Application examples: Disaster relief applications, Environment control, Medicine and health care,….

5. Introduction (cont..)  MAC protocol : media access control  is a sublayer of the data link layer (layer 2). The MAC sublayer provides addressing and channel access control mechanisms that make it possible for several terminals or network nodes to communicate within a multiple access network.  It is the key and basic protocol to ensure the effective communication of WSN  MAC protocol has many problems such as  Highly dependent on time synchronization.  Low throughputs.  Data delay.

6. Introduction (cont..)  In WSN, the multi-channel MAC protocol is available to provide a better communication service as the bandwidth is limited and capacity improvement.  MCMAC protocols can be generally classified into two categories : 1.Single rendezvous SR-MCMAC protocols:  one agreement made between a transmitter and a receiver occurs over only one channel at any time. 2.multiple (parallel) rendezvous (MR) protocols:  multiple agreements made between different transmitter- receiver pairs occur over multiple channels at the same time.

7. Dynamic route multi-channel MAC protocol  Dynamic route allocation algorithm which reduced data delay and increased the throughputs.  Deboned on the neighbor table, it put probability for different relationship neighbors to avoid ( collision )  a large number of nodes sent the data to the same parent node.  Before sending data, the node will determine the type of receiver randomly according to the probability.  Then it chooses a node of this type which is on the control channel from the local neighbor table, and transfer data through an idle data channel chosen from the channel tables.

8. Step to apply Dynamic McMAC protocol 1. Establish node hierarchical model. 2.Dynamic route selection. 3.The Analysis of algorithm.

9. 1.Establish node hierarchical model 1.The sink node sends broadcast message before data transmission.  Broadcast message includes hops (the initial value is 0) which used for setting the hierarchy of node. 2.node receives message and updates local hops, that the current hierarchy.  If the node receives several messages, it sets the minimal hops as its hierarchy. 3.At the end of broadcast, the hierarchy of the whole network established. 4.After the establishment of hierarchy, each node establishes a path to the sink node by themselves’ and the neighbors’ hops.

11. 2. Dynamic route seletion  We divide the whole network into one control channel (CC) and data channels (DC).  The CC is used for controlling message, channel reservation and message broadcast  DC is for data transmission.  Each node maintains two tables in local: 1. The neighbor node table (NT, Neighbor Table) 2. The channel table (CT, Channel Table).

13. 3. The Analysis of algorithm

14. SIMULATION RESULTS  Use NS2 tool.  The experiment compared the throughputs and data delay with the multi-channel protocol and analyzed them.  The result of the simulation is

15. 1.Throughputs of network

16. 2.Average delay analysis

17. CONCLUSION  WSN: group of sensor capturing information from an environment, processing data and transmitting them and send it to sink.  To solve data collision, delay and throughputs in MAC protocol, use multi-channel protocol based on dynamic route selection.