A centralized allocation method of industrial wireless network time slots in tsch mode

Abstract

The invention discloses a method for centralized allocation of industrial wireless network time slots in TSCH mode, aiming at improving the certainty and reliability of industrial wireless networks and reducing network delay. The method can ensure the deterministic scheduling of the network, thereby Realize high reliability; under the scheduling mechanism of this method, the field device sends data to the routing device according to the update cycle priority; at the routing device, the routing device receives the field device data, selects the storage stack according to the data priority, and When the traffic is too large, the data from different field devices are aggregated according to the data priority to generate a data packet, and then the data packet is forwarded according to the data priority. This scheduling method uses update cycle priority, data priority, etc. to ensure that each field device has the opportunity to send data to the gateway, improve network certainty and reliability, and use aggregation to reduce the number of network data transmissions and reduce network transmission. overhead to achieve low latency.

Description

technical field [0001] The invention belongs to the technical field of wireless networks, and in particular relates to a centralized allocation method of industrial wireless network time slots in TSCH mode. Background technique [0002] Deterministic scheduling is the core issue of industrial wireless networks. IEEE 802.15.4e improves and modifies IEEE 802.15.4, adds a MAC layer specially designed for industrial wireless applications, and tries to solve the problems of determinism and reliability. IEEE 802.15.4e specifies three superframe structures: [0003] One is DSME (deterministic and synchronous multichannel extension) multi-superframe structure, the specific format is defined by the coordinator, and the coordinator will periodically send enhanced beacons (EB) with DSME PAN descriptor IE (Information Element). A multi-superframe is a cycle of repeated superframes, and each repeated superframe consists of a beacon frame, contention access period (CAP) and contention-fr...

AI Technical Summary

Problems solved by technology

[0013] In the IEEE 802.15.4e specification, the use of the slot frame structure is given, but the specific network resource scheduling method in the TSCH mode is not given, which makes the deployment of the IEEE 802.15.4e-based network in the TSCH mode very difficult. , how to schedule and allocate network resources according to network equipment acquisition cycle, data priority, channel quality and other parameters is the main problem currently facing

The existing MAC layer scheduling method cannot be directly applied to the TSCH MAC layer. Taking the OTF (On-The-Fly) distributed scheduling method as an example, it is only used for single-hop communication and cannot guarantee global Qos (Quality of Service); Take the TASA (traffic Aware Scheduling Algorithm) centralized scheduling method as an example, it only uses the initial communication value of the network operation to optimize the scheduling, therefore, when an event such as packet loss occurs, TASA does not consider MAC retransmission, so it must be in the following sent within a superframe, resulting in a delay

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