Two-stage optimization of uplink forwarding order with cooperative DBA to accommodate a TDM-PON-based fronthaul link

Daisuke Hisano; Yu Nakayama

doi:10.1364/JOCN.384367

Journal of Optical Communications and Networking
Vol. 12,
Issue 5,
pp. 109-119
(2020)
•https://doi.org/10.1364/JOCN.384367

Two-stage optimization of uplink forwarding order with cooperative DBA to accommodate a TDM-PON-based fronthaul link

Daisuke Hisano and Yu Nakayama

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Daisuke Hisano and Yu Nakayama, "Two-stage optimization of uplink forwarding order with cooperative DBA to accommodate a TDM-PON-based fronthaul link," J. Opt. Commun. Netw. 12, 109-119 (2020)

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Abstract

A fronthaul (FH) link based on a time-division multiplexing passive optical network (TDM-PON) has received attention because it is highly cost effective. The uplink transmission has a long forwarding delay in the TDM-PON link, but this issue can be overcome using a cooperative dynamic bandwidth allocation (CO-DBA) scheme. An optical line terminal receives wireless scheduling information from the distributed unit, which is a part of the mobile base station, and can estimate the amount and arrival timing of the FH signal to an optical network unit (ONU) in advance. However, reports of conventional CO-DBA have not considered a situation involving the accommodation of a large number of ONUs, for which forwarding order control considering the FH characteristics is important. By focusing on maintaining the mobile coverage area as a design criterion, this study proposes a two-step maximization scheme of the number of transmittable ONUs within the FH requirement. Numerical simulation indicates improvements in the number of transmittable ONUs and bandwidth usage efficiency.

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Set of ONUs Requiring Bandwidth	$V$
Set of transmittable ONUs	$S_{1} \subset V, S_{2} \subset V$
Queueing delay time	$d_{i} \geq 0$
Frame burst length	$b_{i} \geq 0$
FH requirement	$D_{r e q}$
PON bandwidth	$B \geq 0$

Items	Value
Simulation time	30 s
No. of UEs	8 users/RU
No. of RUs	8, 16, 32 RUs
TTI length	1 ms
FH requirement $D_{r e q}$	150 µs
	without propagation
	delay (100 µs)
UE throughput	10 Mbps (vacant)
Degree of congestion $α$	0.1, 0.3, 0.5, 0.7
Throughput ratio $γ$	10, 15
Average traffic generation interval	5.0 s
Average traffic duration	1.0 s
No. of MIMO streams $N_{M I M O}$	4 streams
No. of RBs $N_{R B}$	100 RB
No. of sub-carriers per RB $N_{s c}$	12 SC
No. of OFDM symbols per sub-frame $N_{s y m}$	14 OFDM symbols
Modulation index $N_{m o d}$	8 bits
No. of quantization bits $N_{q}$	6 bits

Items	Value
Baud rate, $R_{b}$	10 Gbps
Polling cycle, $C_{p o l l}$	1 ms
No. of ONUs	8, 16, 32 ONUs
No. of wavelengths	1
Ethernet frame size	Up to 1500 bytes
FEC codeword	216 bytes
FEC parity	32 bytes
Burst overhead	1024 bytes
XGEM header length	8 bytes
FS overhead	8 bytes
DBRu size	4 bytes

Set of ONUs Requiring Bandwidth	$V$
Set of transmittable ONUs	$S_{1} \subset V, S_{2} \subset V$
Queueing delay time	$d_{i} \geq 0$
Frame burst length	$b_{i} \geq 0$
FH requirement	$D_{r e q}$
PON bandwidth	$B \geq 0$

Items	Value
Simulation time	30 s
No. of UEs	8 users/RU
No. of RUs	8, 16, 32 RUs
TTI length	1 ms
FH requirement $D_{r e q}$	150 µs
	without propagation
	delay (100 µs)
UE throughput	10 Mbps (vacant)
Degree of congestion $α$	0.1, 0.3, 0.5, 0.7
Throughput ratio $γ$	10, 15
Average traffic generation interval	5.0 s
Average traffic duration	1.0 s
No. of MIMO streams $N_{M I M O}$	4 streams
No. of RBs $N_{R B}$	100 RB
No. of sub-carriers per RB $N_{s c}$	12 SC
No. of OFDM symbols per sub-frame $N_{s y m}$	14 OFDM symbols
Modulation index $N_{m o d}$	8 bits
No. of quantization bits $N_{q}$	6 bits

Abstract

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Equations (18)

Journal of Optical Communications and Networking