Design And Implementation Of IEEE 802.15.4e TSCH Timeslot Scheduling Based On Contiki

IEEE 802.15.4e-2012 standard is an amendment to IEEE 802.15.4-2011 MAC specification. IEEE 802.15.4e-2012 standard proposed five different operating mode for the industrial scenes. The study of this thesis focuses on TSCH mode which is one of them. TSCH MAC has changed a lot compared to the traditional 802.15.4 MAC.This thesis gives a full analysis of TSCH operating mode in the standard. TSCH has serveral characteristics, such as: slotframe structure, the whole network time synchronization, communication in timeslot, new TSCH CSMA/CA channel access mechanism and channel hopping technology. The thesis final y finds that, from the standard to achieve TSCH mode in multi-hop network applications also need to add in some part, of which the most important is TSCH timeslot scheduling policy. TSCH mode uses the benefits of channel hopping technology to enhance communication link resources, but improvement of the communication resources does not necessarily bring improvement of network performance. An appropriate resource scheduling policy is required.Based on the standard and requirements of the project which this thesis relies on, this thesis designs a TSCH timeslot scheduling. This scheduling policy can apply to largescale multi-hop wireless sensor network in which nodes have adequate energy supply. The policy firstly gives a classification of timeslot resources in accordance with the needs of the upper packet, ADV, TX, RX, Bcast TRX and Ucast TRX five timeslots resource type classification. ADV, TX and RX timeslots use static al ocation strategy, while Bcast TRX and Ucast TRX which both support frame transmission and frames received use dynamic policy scheduling. This thesis also gives a decision rules of node role in Bcast TRX and Ucast TRX timeslots. The thesis gives a detailed description of the specific operational procedures of nodes on different roles in different timeslots. The timeslot scheduling strategy can meet the one-hop broadcast communication and multi-hop unicast communication of the upper layer communication needs.This thesis includes an implementation of 802.15.4e TSCH mode MAC layer with use of the proposed timeslot scheduling strategy on Contiki platform. This thesis gives serveral detail descriptions of some key processes, such as the start-up and management of TSCH PAN, time synchronization mechanism, TSCH CSMA/CA algorithm, transmission mode and BUFF management.Finally, with using of the simulator Cooja on Contiki platform, this thesis did several large-scale multi-hop networks simulation experiments of nodes with TSCH MAC implemented in this article and of nodes with traditional 802.15.4 MAC respectively. Comparing of the experimental results shows that in large-scale network scenarios, the use of this timeslot scheduling policy implemented 802.15.4e TSCH MAC is significantly better than traditional 802.15.4 MAC in performance.