Abstract
Fifth-generation (5G) of wireless networks are expected to accommodate different services with contrasting quality of service (QoS) requirements within a common physical infrastructure in an efficient way. In this article, we address the radio access network (RAN) slicing problem and focus on the three 5G primary services, namely, enhanced mobile broadband (eMBB), ultra-reliable and low-latency communications (URLLC) and massive machine-type communications (mMTC). In particular, we formulate the joint allocation of power and resource blocks to the heterogeneous users in the downlink targeting the transmit power minimization and by considering mixed numerology-based frame structures. Most importantly, the proposed scheme does not only consider the heterogeneous QoS requirements of each service, but also the queue status of each user during the scheduling of resource blocks. In addition, imperfect Channel State Information (CSI) is considered by including an outage probabilistic constraint into the formulation. The resulting non-convex problem is converted to a more tractable problem by exploiting Big-M formulation, probabilistic to non-probabilistic transformation, binary relaxation and successive convex approximation (SCA). The proposed solution is evaluated for different mixed-numerology resource grids within the context of strict slice-isolation and slice-aware radio resource management schemes via extensive numerical simulations.
Highlights
T HE UPCOMING fifth-generation (5G) of wireless networks are expected to manage a wide variety of verticals with different requirements such as high data-rate, low-latency, and reliability [1]
We focus on the optimization of the radio access network (RAN) slicing mechanism, which involves the efficient allocation of physical radio resources available at the base station
In our previous work [29], we have investigated the slice-aware RAN resource allocation mechanism to optimize the Long-Term evolution (LTE) standard radio resources (i.e., 0.5ms each transmission time interval (TTI), 1ms sub-frame and 10ms frame) between enhanced mobile broadband (eMBB) and ultra-reliable low-latency communications (URLLC) services according to their stringent quality of service (QoS) requirements
Summary
T HE UPCOMING fifth-generation (5G) of wireless networks are expected to manage a wide variety of verticals with different requirements such as high data-rate, low-latency, and reliability [1]. In our previous work [29], we have investigated the slice-aware RAN resource allocation mechanism to optimize the LTE standard radio resources (i.e., 0.5ms each transmission time interval (TTI), 1ms sub-frame and 10ms frame) between eMBB and URLLC services according to their stringent QoS requirements. We jointly allocate the transmission power and RBs with mixed-numerologies to the users by considering the MCS based link adaptation process, different traffic arrival patterns (i.e., queue models), and imperfect channel state information (CSI) We formulate these RAN slicing problems as optimization problems to minimize the consumed power of BS while satisfying the isolation constraints, outage constraint, and QoS requirements of users requesting different services.
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