Method for centralized allocation of time slots of industrial wireless network in TSCH mode

Abstract

The invention discloses a method for centralized allocation of time slots of an industrial wireless network in a TSCH mode and aims at improving the problems of determinacy and reliability of the industrial wireless network and reducing the network delay. According to the method, the deterministic scheduling of the network can be guaranteed, so that the high reliability is realized; field equipment sends data to route equipment according to the refresh cycle priority under a scheduling mechanism of the method; the route equipment receives data of the field equipment, selects a storage stack according to the data priority, carries out aggregation on the data from different field equipment according to the data priority in order to generate a data packet when the network communication traffic is too large and forwards the data packet according to the data priority at the route equipment. The scheduling method adopts the ways of refresh cycle priority and data priority to guarantee that each equipment has an opportunity of sending the data to a gateway, so that the determinacy and the reliability of the network are improved, and furthermore, through adoption of an aggregation way, the network data transmission times and the network transmission cost can be reduced, so that the low delay is realized.

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...

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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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