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arXiv · 2002.03265

Robust URLLC Packet Scheduling of OFDM Systems

Jing Cheng·Chao Shen·Shuqiang Xia
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Abstract

In this paper, we consider the power minimization problem of joint physical resource block (PRB) assignment and transmit power allocation under specified delay and reliability requirements for ultra-reliable and low-latency communication (URLLC) in downlink cellular orthogonal frequency-division multiple-access (OFDMA) system. To be more practical, only the imperfect channel state information (CSI) is assumed to be available at the base station (BS). The formulated problem is a combinatorial and mixed-integer nonconvex problem and is difficult to tackle. Through techniques of slack variables introduction, the first-order Taylor approximation and reweighted $\ell_1$-norm, we approximate it by a convex problem and the successive convex approximation (SCA) based iterative algorithm is proposed to yield sub-optimal solutions. Numerical results provide some insights into the impact of channel estimation error, user number, the allowable maximum delay and packet error probability on the required system sum power.

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Jing Cheng, Chao Shen, Shuqiang Xia. 2020-02-09. Robust URLLC Packet Scheduling of OFDM Systems. https://arxiv.org/abs/2002.03265

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