Effects of port congestion in the gate control list scheduling of time sensitive networks

Abstract

Abstract-Time Sensitive Networking (TSN) can provide deterministic traffic behavior over Ethernet networks, for time sensitive traffic, whilst also bound the delay/jitter. To do so, the IEEE TSN working group introduced a network-wide transmission port scheduling mechanism. The duration of this schedule is directly related with the delay; hence reducing it can be beneficial within the TSN paradigm. This paper investigates the effects of port congestion, in the duration of the network wide schedule. A congested port can make scheduling more complex, leading to longer network-wide schedules. To verify this, the same set of experiments was repeated, with and without considering port congestion during path allocation. The computed paths were given as input to an implementation of the shifting bottleneck heuristic algorithm. The shifting bottleneck heuristic, computed the network-wide gating schedule. The results show that with port congestion as a metric during path allocation the duration of the gating schedule in multipath networks can be reduced up to 26%.

Removing the Wires in Time-Sensitive Networks

“…As demonstrated by different works, TSN scheduling to guarantee bounded latency and high reliability is a complex problem [23], [24]. Considering every node has its own requirements, with diverging traffic flow priorities, plus a constantly changing environment and limited time resources, it is important to devise strategies to optimize time slot usage.…”

Ultra-Low Latency (ULL) Networks: The IEEE TSN and IETF DetNet Standards and Related 5G ULL Research

“…The simulation results indicate that an optimization process can be scalable while achieving the desired level of scheduling benefits, i.e., bounded latency and jitter for an end-to-end connection carrying real-time traffic. Craciunas et al have further developed this optimal scheduling problem in [176], [177] A related scheduling approach based on a graphical model has recently been examined by Farzaneh et al [128], while a recent study by Kentis et al [178] has examined the impact of port congestion on the scheduling. d) Joint Routing and Scheduling: TSN frame transmissions out of the queues can be controlled through gating (see Section III-D2), whereby a predefined event triggers the gate to transmit a frame from a queue according to a prescribed scheduling policy.…”

Performance analysis of cost effective multi-hop Time Sensitive Network for IEEE 802.1Qbv and IEEE 802.1Qbu standards

“…The traffic classes are Scheduled traffic(ST), Audio Video Bridging (AVB) traffic with bounded latency and Best-Effort(BE) data with default priority. In our work,scheduled traffic with PCP value 7 is considered for which the schedule is generated offline in Gate Control List(GCL) [7][14][15] [ 16], sensor data with the priority of 6, video data of priority 5 and the BE traffic with default priority or PCP value 0 is considered Which has the lowest priority. Each Ethernet traffic class has a priority and is mapped to either express or preemptible interface.…”