Abstract
Compared to asynchronous contention-based random access, e.g., carrier sensing multiple access, synchronous and distributed link scheduling for orthogonal frequency-division multiplexing (OFDM) systems is a viable solution to improve system throughput for device-to-device (D2D) ad hoc network. In particular, spatial spectral efficiency can be improved by scheduling as many concurrent D2D links necessary to satisfy individual signal-to-interference ratio (SIR) requirements. In this paper, we propose an adaptive yielding mechanism that can further improve the spatial spectral efficiency by allowing for more concurrent D2D links whenever more interference can be accepted, e.g., when the instantaneous bandwidth efficiency requirement is less than the current link capacity. Even if the system throughput varies with the link density, it is shown that the average system throughput can be significantly improved by the proposed yielding mechanism.
Highlights
As opposed to the cellular systems which have been designed to support the mobile station throughout of the rather wide-area coverage, there have been various types of schemes or systems, including Wi-Fi Direct or Bluetooth, which establish links between nearby devices without resorting to an associated access point [1,2,3]
We have introduced a notion of conservative yielding that allows for the low-priority link to be scheduled without overprovisioning the link quality of its proximate high-priority links with respect to the required bandwidth efficiency as a means of improving the throughput performance over the existing link scheduling scheme
We have proposed an idea of generous yielding that allows for the low-priority link to be scheduled by falling back the data rate or delaying the transmission for a high-priority transmitter without too much data waiting in the buffer
Summary
As opposed to the cellular systems which have been designed to support the mobile station throughout of the rather wide-area coverage, there have been various types of schemes or systems, including Wi-Fi Direct or Bluetooth, which establish links between nearby devices without resorting to an associated access point [1,2,3]. In the recent advance in cellular systems, such a device-to-device (D2D) communication scheme has been considered as a means of device-centric mobile social network service (SNS), which discovers the proximity devices and connect them over the direct link [4] It can be implemented either as inband or outband D2D [5]. We propose a new type of link scheduling scheme that can eliminate the inefficiency associated with distributed scheduling in a synchronous D2D ad hoc network and demonstrate its performance gain over the existing scheme It allows for reusing other links spatially within the permissible range while consuming the link capacity only as much as enough to satisfy the required bandwidth efficiency for each link.
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