Allocating Multiple D2D Users to Subchannels with Partial CSI in Multi-Cell Scenarios

Gorantla, BVR and Mehta, NB (2019) Allocating Multiple D2D Users to Subchannels with Partial CSI in Multi-Cell Scenarios. In: 2019 IEEE International Conference on Communications, ICC 2019, 20 - 24 May 2019, Shanghai.

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Abstract

We address the problem of allocating multiple device-to-device (D2D) pairs per subchannel in a multi-cell scenario with multiple subchannels and unknown inter-D2D and inter-cell interference. We propose a scheme to feedback q bits about the signal-to-interference-plus-noise ratio of a D2D pair for each subchannel that ensures that the D2D rates can be achieved with a pre-specified probability of outage. Along with this, the base station (BS) has only statistical information about the inter-cell interference, and has to provide a quality-ofservice guarantee to the scheduled cellular users. We formulate the subchannel allocation problem as a generalized assignment problem, and propose a low-complexity locally greedy algorithm (LGA) to solve it. LGA provably achieves a D2D sum rate that is at least 1=2 and 1=3 of the maximum achievable D2D sum rate for q = 1 and q 2, respectively. We then propose a rate upgradation (RU) step that enhances the D2D rate by exploiting an inherent asymmetry in the channel state information (CSI) at the BS and D2D pairs. LGA with RU achieves a spectral efficiency that is markedly better than conventional approaches that assign one D2D pair per subchannel, and close to that of a system with full CSI of the intra-cell links even for small q. © 2019 IEEE.

Item Type:	Conference Paper
Publication:	IEEE International Conference on Communications
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The copyright for this article belongs to Institute of Electrical and Electronics Engineers Inc.
Keywords:	Cells; Combinatorial optimization; Computational complexity; Radio interference; Signal to noise ratio, Conventional approach; Generalized assignment problem; Intercell interference; Probability of outage; Signal to interference plus noise ratio; Spectral efficiencies; Statistical information; Subchannel allocation, Channel state information
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	28 Dec 2022 05:10
Last Modified:	28 Dec 2022 05:10
URI:	https://eprints.iisc.ac.in/id/eprint/78595

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