Full-duplex (FD) wireless is an attractive communication
paradigm with high potential for improving network
capacity and reducing delay in wireless networks. Despite significant
progress on the physical layer development, the challenges
associated with developing medium access control (MAC)
protocols for heterogeneous networks composed of both legacy
half-duplex (HD) and emerging FD devices have not been fully
addressed. Therefore, we focus on the design and performance
evaluation of scheduling algorithms for infrastructure-based
heterogeneous HD-FD networks (composed of HD and FD users).
We first show that centralized GreedyMaximal Scheduling (GMS)
is throughput-optimal in heterogeneous HD-FD networks. We
propose the Hybrid-GMS (H-GMS) algorithm, a distributed
implementation of GMS that combines GMS and a queue-based
random-access mechanism. We prove that H-GMS is throughputoptimal.
Moreover, we analyze the delay performance of H-GMS
by deriving lower bounds on the average queue length. We
further demonstrate the benefits of upgrading HD nodes to FD
nodes in terms of throughput gains for individual nodes and
the whole network. Finally, we evaluate the performance of HGMS
and its variants in terms of throughput, delay, and fairness
between FD and HD users via extensive simulations. We show
that in heterogeneous HD-FD networks, H-GMS achieves 16–30×
better delay performance and improves fairness between HD and
FD users by up to 50% compared with the fully decentralized
Q-CSMA algorithm.
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This content will become publicly available on September 1, 2024
Multi-Band Full Duplex MAC Protocol (MB-FDMAC)
In this paper, we propose a multi-band medium
access control (MAC) protocol for an infrastructure-based network
with an access point (AP) that supports In-Band full-duplex
(IBFD) and multiuser transmission to multi-band-enabled stations.
The Multi-Band Full Duplex MAC (MB-FDMAC) protocol
mainly uses the sub-6 GHz band for control-frame exchange,
transmitted at the lowest rate per IEEE 802.11 standards,
and uses the 60 GHz band, which has significantly higher
instantaneous bandwidth, exclusively for data-frame exchange.
We also propose a selection method that ensures fairness among
uplink and downlink stations. Our result shows that MB-FDMAC
effectively improves the spectral efficiency in the mmWave band
by 324%, 234%, and 189% compared with state-of-the-art MAC
protocols. In addition, MB-FDMAC significantly outperforms
the combined throughput of sub-6 GHz and 60 GHz IBFD
multiuser MIMO networks that operate independently by more
than 85%. In addition, we study multiple network variables such
as the number of stations in the network, the percentage of
mmWave band stations, the size of the contention stage, and
the selection method on MB-FDMAC by evaluating the change
in the throughput, packet delay, and fairness among stations.
Finally, we propose a method to improve the utilization of the
high bandwidth of the mmWave band by incorporating time
duplexing into MB-FDMAC, which we show can enhance the
fairness by 12.5%and significantly reduces packet delay by 80%.
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- Award ID(s):
- 1909381
- NSF-PAR ID:
- 10477714
- Publisher / Repository:
- IEEE
- Date Published:
- Journal Name:
- IEEE Journal on Selected Areas in Communications
- Volume:
- 41
- Issue:
- 9
- ISSN:
- 0733-8716
- Page Range / eLocation ID:
- 2864 to 2878
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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