NDLI: Capacities of Physical Layer Scheduling Strategies on a Shared Link

Content Provider	Springer Nature Link
Author	Hämäläinen, Jyri Wichman, Risto
Copyright Year	2006
Abstract	We compare capacities of three physical layer scheduling algorithms: on-off scheduling (OOS), maximum SNR, and round robin schedulers. With OOS, downlink transmission is suspended if the instantaneous received SNR in the mobile station falls below a given threshold requiring only one feedback bit per user, which considerably decreases the overhead of the feedback signaling when compared with maximum SNR scheduler. In case of FDD systems, OOS and maximum SNR schedulers require a fast feedback channel from mobile to base station like the one in the FDD WCDMA system, while round robin operates independently of the channel state.We derive asymptotic capacity gains of the three schedulers in high SNR region and study the effect of feedback bit errors to capacities. It is noticed that OOS has an optimal threshold, which depends on the number of users and their mean SNRs. As expected, maximum SNR scheduler provides the largest capacity among the three schedulers, but if additional spatial diversity, i.e., transmit antenna selection is available, the difference between the capacities of OOS and maximum SNR schedulers is small.
Starting Page	115
Ending Page	134
Page Count	20
File Format	PDF
ISSN	09296212
Journal	Wireless Personal Communications
Volume Number	39
Issue Number	1
e-ISSN	1572834X
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2006-08-05
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Shannon capacity shared channel physical layer scheduling Signal, Image and Speech Processing Electronic and Computer Engineering Processor Architectures
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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