Time-aware deterministic bandwidth allocation scheme in TDM-PON for time-sensitive industrial flows

Chen Su; Jiawei Zhang; Yuefeng Ji

doi:10.1364/JOCN.481996

Journal of Optical Communications and Networking
Vol. 15,
Issue 5,
pp. 255-267
(2023)
•https://doi.org/10.1364/JOCN.481996

Time-aware deterministic bandwidth allocation scheme in TDM-PON for time-sensitive industrial flows

Chen Su, Jiawei Zhang, and Yuefeng Ji

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Chen Su, Jiawei Zhang, and Yuefeng Ji, "Time-aware deterministic bandwidth allocation scheme in TDM-PON for time-sensitive industrial flows," J. Opt. Commun. Netw. 15, 255-267 (2023)

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Abstract

A programmable logic controller deployed in the cloud or edge cloud (cloud PLC) contributes to flexible and scalable industrial manufacturing processes. For the industrial Internet, a time-division multiplexing passive optical network is a promising access technology for connecting cloud PLC and industrial devices. Time-sensitive (TS) industrial applications such as motion control and mobile robotics impose strict delay and jitter requirements, pursuing deterministic transmission capability, that is, guaranteeing that the upper bounds on delay and jitter of the TS industrial flow meet its requirements. However, traditional bandwidth allocation schemes aim to leverage statistical multiplexing to improve bandwidth resource utilization efficiency, so it guarantees only the “average delay/jitter” of the service and cannot meet the deterministic requirements of the TS industrial flow. This paper presents a time-aware deterministic bandwidth allocation (TA-DetBA) scheme to satisfy the deterministic transmission of TS industrial flows. To this purpose, first, we constrain the position of the transmission window (i.e., bandwidth) allocated by optical line termination to the optical network unit according to the arrival characteristics (i.e., flow arrival time and flow cycle) and requirements (i.e., delay and jitter) of the flow. Subsequently, we propose an integer linear programming scheduling model and a greedy-based time slot equalization heuristic scheduling algorithm to improve schedulability and reduce the average delay of best-effort flows. Simulation results show that our proposed TA-DetBA scheme guarantees the deterministic delay and jitter of TS industrial flow. Compared with the fixed bandwidth allocation (FBA) scheme, the average resource utilization efficiency of the TA-DetBA scheme is improved by up to 20.6% higher than FBA.

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Constant	Description
$R$	PON system rate $i$
$t_{p r o c}$	Processing delay within the ONU and OLT $i$
$t_{p r o c}$	Propagation delay between the ONU and OLT $i$
$G_{ts}$	Size of time slot $i$
$T_{se}$	Synchronization errors among the industrial device, GW, and PON $i$
$s_{T}^{i}$	Cycle of TS industrial flow $i$
$s_{D}^{i}$	e2e delay requirement of TS industrial flow $i$
$s_{J}^{i}$	e2e jitter requirement of TS industrial flow $i$
$s_{L}^{i}$	Data size of TS industrial flow $i$ in one cycle
$N_{f}$	Number of TS flows
$F$	Set of TS flows
$D$	Set of DBA cycles in a supercycle
$T_{sc}$	Size of a supercycle
$T_{DBA}$	Size of a DBA cycle
$T_{G}$	Size of a guard bandwidth
$T_{AT}^{i, n}$	Arrival time of flow $i$ in the $n$ th cycle
$T_{P}^{i}$	Cycle of TS flow $i$
$T_{DT}^{i}$	e2e delay tolerance of TS flow $i$
$T_{JT}^{i}$	e2e jitter tolerance of TS flow $i$
$T_{TW}^{i}$	Size of the TW for TS flow $i$
${UBD}^{i, n}$	Upper bound on the waiting delay of the $n$ th TW of TS flow $i$
$T_{S}$	Cycle of the shaping TW in GW $i$
Variables	Description
$S_{TW}^{i, n}$	Start time of the TW for the $n$ th cycle of TS flow $i$ in a supercycle
$S_{us}^{i}$	Binary, one if TS flow $i$ is not successfully scheduled; zero if TS flow $i$ is successfully scheduled
$T S_{s}^{i, n, w}$	Binary, one if the $w$ th time slot of the $n$ th TW of TS flow $i$ is in the sth DBA cycle
$D_{m a x}$	Maximal difference in the number of used time slots in the different DBA cycles in a supercycle

Flow Types	Cycle	Delay	Jitter	Size
Iso-Type1	500 µs	500 µs	1 µs	200Bytes
Iso-Type2	1000 µs	1000 µs	1 µs	400Bytes
Cli-Type1	2000 µs	1000 µs	500 µs	800Bytes
Cli-Type2	4000 µs	2000 µs	1000 µs	1600Bytes

Constant	Description
$R$	PON system rate $i$
$t_{p r o c}$	Processing delay within the ONU and OLT $i$
$t_{p r o c}$	Propagation delay between the ONU and OLT $i$
$G_{ts}$	Size of time slot $i$
$T_{se}$	Synchronization errors among the industrial device, GW, and PON $i$
$s_{T}^{i}$	Cycle of TS industrial flow $i$
$s_{D}^{i}$	e2e delay requirement of TS industrial flow $i$
$s_{J}^{i}$	e2e jitter requirement of TS industrial flow $i$
$s_{L}^{i}$	Data size of TS industrial flow $i$ in one cycle
$N_{f}$	Number of TS flows
$F$	Set of TS flows
$D$	Set of DBA cycles in a supercycle
$T_{sc}$	Size of a supercycle
$T_{DBA}$	Size of a DBA cycle
$T_{G}$	Size of a guard bandwidth
$T_{AT}^{i, n}$	Arrival time of flow $i$ in the $n$ th cycle
$T_{P}^{i}$	Cycle of TS flow $i$
$T_{DT}^{i}$	e2e delay tolerance of TS flow $i$
$T_{JT}^{i}$	e2e jitter tolerance of TS flow $i$
$T_{TW}^{i}$	Size of the TW for TS flow $i$
${UBD}^{i, n}$	Upper bound on the waiting delay of the $n$ th TW of TS flow $i$
$T_{S}$	Cycle of the shaping TW in GW $i$
Variables	Description
$S_{TW}^{i, n}$	Start time of the TW for the $n$ th cycle of TS flow $i$ in a supercycle
$S_{us}^{i}$	Binary, one if TS flow $i$ is not successfully scheduled; zero if TS flow $i$ is successfully scheduled
$T S_{s}^{i, n, w}$	Binary, one if the $w$ th time slot of the $n$ th TW of TS flow $i$ is in the sth DBA cycle
$D_{m a x}$	Maximal difference in the number of used time slots in the different DBA cycles in a supercycle

Flow Types	Cycle	Delay	Jitter	Size
Iso-Type1	500 µs	500 µs	1 µs	200Bytes
Iso-Type2	1000 µs	1000 µs	1 µs	400Bytes
Cli-Type1	2000 µs	1000 µs	500 µs	800Bytes
Cli-Type2	4000 µs	2000 µs	1000 µs	1600Bytes

Abstract

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Journal of Optical Communications and Networking