Abstract
In this paper, a new queuing model for the Tactile Internet (TI) is proposed for the cloud radio access network (C-RAN) architecture of the next generation wireless networks, e.g., 5G, assisted via orthogonal frequency division multiple access (OFDMA) technology. This model includes both the radio remote head (RRH) and baseband processing unit (BBU) queuing delays and reliability for each end to end (E2E) connection between each pair of tactile users. For this setup, with the aim to minimize the transmit power of users subject to guaranteeing tolerable delay of users, and fronthaul and access limitations, we formulate a resource allocation problem. Since the proposed optimization problem is highly non-convex, to solve it in an efficient manner, we utilize diverse transformation techniques such as successive convex approximation (SCA) and difference of two convex functions (DC). In addition, we propose an admission control (AC) algorithm to make problem feasible. In our proposed system model, we dynamically adjust the fronthaul and access links to minimize the transmit power. Simulation results reveal that by dynamic adjustment of the access and fronthaul delays, transmit power can be saved compared to the case of fixed approach per each transmission session. Moreover, the number of rejected users in the network is significantly reduced and more users are accepted.
Highlights
Channel power gains for the access links are set as hsi,kj,jqq = si,kj,jqqdij,q−α where dij,q is the distance between user i and remote radio heads (RRHs) j, s,j,q i,kjq is a random variable which is generated by Rayleigh distribution, and α = 3 is the path-loss exponent
In this paper, we proposed a novel queuing model based on admission control (AC) for the Tactile Internet (TI) services in OFDMAbased cloud radio access networks (C-RANs) serving several pairs of tactile users
For each pair of tactile users within C-RAN coverage area, our setup includes RRH and baseband units (BBUs) queuing delays in one E2E connection which is a more practical scenario in this context compared to previous works
Summary
One of the main requirements of the TI service is tight end-to-end (E2E) delay requirement, e.g., E2E delay should be less than one millisecond [1]–[4]. These requirements cannot be guaranteed via existing wireless networks such as fourth-generation (4G) wireless networks [4]. The associate editor coordinating the review of this manuscript and approving it for publication was Xujie Li. 5G platform via virtualized and cloud-based architecture can be leveraged to implement the TI services [1], [2]
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