Cyclic transmission window-based bandwidth allocation scheme for asynchronous time-sensitive industrial applications in TDM-PON

Chen Su; Jiawei Zhang; Yuefeng Ji

doi:10.1364/JOCN.497848

Journal of Optical Communications and Networking
Vol. 15,
Issue 11,
pp. 820-829
(2023)
•https://doi.org/10.1364/JOCN.497848

Cyclic transmission window-based bandwidth allocation scheme for asynchronous time-sensitive industrial applications in TDM-PON

Chen Su, Jiawei Zhang, and Yuefeng Ji

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Chen Su, Jiawei Zhang, and Yuefeng Ji, "Cyclic transmission window-based bandwidth allocation scheme for asynchronous time-sensitive industrial applications in TDM-PON," J. Opt. Commun. Netw. 15, 820-829 (2023)

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Abstract

The industrial Internet has become an important application scenario for time-division multiplexing passive optical networks (TDM-PONs). Time-sensitive (TS) industrial applications, such as control-to-control communications, require a TDM-PON to have deterministic transmission capability. Traditional bandwidth allocation schemes are unable to fulfill this capability; thus we proposed a time-aware deterministic bandwidth allocation (TA-DetBA) scheme to guarantee deterministic delay and jitter in our previous work. TA-DetBA allocates appropriate transmission windows (TWs) to each TS industrial flow in a supercycle based on the flow’s arrival time, cycle, delay, and jitter requirements. However, “awaring” the arrival time of flow relies on precise time synchronization between the TDM-PON and industrial devices, which makes TA-DetBA unsuitable for those TS industrial applications that are asynchronous to the TDM-PON. In addition, the diversity of flow cycles may make the size of the supercycle and the number of allocated TWs large, thus increasing the complexity of the TW scheduling algorithm. To this end, we propose a cyclic TW-based deterministic bandwidth allocation (CTW-DetBA) scheme for asynchronous industrial applications. First, we design cyclic TWs with appropriate cycle and size for TS industrial flows, which not only improves the schedulability of TWs (i.e., the ratio of the number of successfully scheduled TWs to the total number of TWs) but also reduces the complexity of the algorithm. Then, we construct a TW scheduling model based on the satisfiability model theory to schedule the TWs in the PON upstream frame. Simulation results show that the CTW-DetBA guarantees the deterministic transmission of TS industrial flows that are asynchronous to the TDM-PON system. Compared with the fixed bandwidth allocation scheme, the average schedulability of the CTW-DetBA can be increased by up to 62.03%, and the average resource utilization efficiency can be increased by up to 20.4%.

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Notations	Description
$t_{p r o c}$	Processing delay within the ONU and OLT
$t_{p r o p}$	Propagation delay between the ONU and OLT
$t_{s}^{i}$	Sending delay of TS flow $i$ in one cycle
$t_{w}^{i, k}$	Waiting delay of the packet in the $k$ th cycle of TS flow $i$ in an ONU
$t_{g}$	Size of the guard band
$C^{i}$	Cycle of TS flow $i$
$D^{i}$	E2E delay requirement of TS flow $i$
$J^{i}$	E2E jitter requirement of TS flow $i$
$M^{i, j}$	Maximum tolerable waiting delay of TS flow $j$ in T-CONT $i$
$T$	Set of the T-CONT
$N^{i}$	Number of TS flows in T-CONT $i$
$S^{i}$	Start time of TW $i$
$P^{i}$	Cycle of TW $i$
$B^{i}$	Size of TW $i$
$H^{i, j}$	Supercycle of TW $i$ and $j$
$d$	Offset between the TW start time and the AT of the flow’s first packet
$O^{i, j}$	Offset between the start times of TWs $i$ and $j$
$G^{i, j}$	GCD of the cycles of TWs $i$ and $j$
$S_{g}^{i}$	Sum of the size of TW $i$ and the guard band
$S_{p}$	Sum of TCRs
$S_{g}$	Sum of TGRs
$U$	Upper bound of bandwidth resources allocated to TS flows
$G$	Set of optional GCDs
$g_{m i n}$	Minimum value in the GCD set
$N, m, n, X^{i}$	Positive integers

Flow Type	Cycle	E2E Delay	E2E Jitter	Data Size
Type 1	1000 µs	1000 µs	1000 µs	800 bytes
Type 2	1000 µs	1000 µs	500 µs	800 bytes
Type 3	1000 µs	1000 µs	100 µs	800 bytes
Type 4	1000 µs	600 µs	1000 µs	800 bytes
Type 5	1000 µs	200 µs	1000 µs	800 bytes
Type 6	1500 µs	1000 µs	500 µs	800 bytes
Type 7	2000 µs	1000 µs	500 µs	800 bytes

Notations	Description
$t_{p r o c}$	Processing delay within the ONU and OLT
$t_{p r o p}$	Propagation delay between the ONU and OLT
$t_{s}^{i}$	Sending delay of TS flow $i$ in one cycle
$t_{w}^{i, k}$	Waiting delay of the packet in the $k$ th cycle of TS flow $i$ in an ONU
$t_{g}$	Size of the guard band
$C^{i}$	Cycle of TS flow $i$
$D^{i}$	E2E delay requirement of TS flow $i$
$J^{i}$	E2E jitter requirement of TS flow $i$
$M^{i, j}$	Maximum tolerable waiting delay of TS flow $j$ in T-CONT $i$
$T$	Set of the T-CONT
$N^{i}$	Number of TS flows in T-CONT $i$
$S^{i}$	Start time of TW $i$
$P^{i}$	Cycle of TW $i$
$B^{i}$	Size of TW $i$
$H^{i, j}$	Supercycle of TW $i$ and $j$
$d$	Offset between the TW start time and the AT of the flow’s first packet
$O^{i, j}$	Offset between the start times of TWs $i$ and $j$
$G^{i, j}$	GCD of the cycles of TWs $i$ and $j$
$S_{g}^{i}$	Sum of the size of TW $i$ and the guard band
$S_{p}$	Sum of TCRs
$S_{g}$	Sum of TGRs
$U$	Upper bound of bandwidth resources allocated to TS flows
$G$	Set of optional GCDs
$g_{m i n}$	Minimum value in the GCD set
$N, m, n, X^{i}$	Positive integers

Flow Type	Cycle	E2E Delay	E2E Jitter	Data Size
Type 1	1000 µs	1000 µs	1000 µs	800 bytes
Type 2	1000 µs	1000 µs	500 µs	800 bytes
Type 3	1000 µs	1000 µs	100 µs	800 bytes
Type 4	1000 µs	600 µs	1000 µs	800 bytes
Type 5	1000 µs	200 µs	1000 µs	800 bytes
Type 6	1500 µs	1000 µs	500 µs	800 bytes
Type 7	2000 µs	1000 µs	500 µs	800 bytes

Abstract

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Equations (13)

Journal of Optical Communications and Networking