The impact of user mobility into non-orthogonal multiple access (NOMA) transmission systems

Abstract

Non-orthogonal multiple access techniques (NOMA) have been recognized as a paradigm shift for the design of multiple access techniques for the next generation of wireless networks. Many existing works on NOMA have focused on scenarios with low-mobility users (static), where users with different channel conditions or quality of service (QoS) requirements are grouped together for the implementation of NOMA. However, when increased, user mobility can strongly impacts on the performance of a NOMA systems, especially in the context of downlink perceived throughput, networ fairness and QoS fuilfilment of each users. This paper presents some of the main drawback which can be obtained if the user mobility is not taken into account in the design of NOMA communication systems. Future direction and challenges to address these issues are also discussed.

Twin Delayed DDPG based Dynamic Power Allocation for Mobility in IoRT

“…They proposed a traditional dynamic power allocation (DPA) algorithm by considering the channel conditions because of UE mobility. According to [19], UE mobility strongly impacts NOMA's performance, especially for downlink throughput. In [73], the authors developed a power control algorithm for the wireless network where the communication channel varies because of UE mobility.…”

“…In the real-world application of IoRT, the mobility of UE is a crucial issue. Due to mobility, channel conditions, path loss, shadow effect, and small-scale fading are varied, which is the more realistic problem [17][18][19]. The main contributions of this article are summarized below: 1.…”

User mobility into NOMA assisted communication: Analysis and a Reinforcement Learning with Neural Network based approach

“…Then, according with Eqs. (4)-(7), performing a power allocation at time t based on the CSI received at time t − 1, could negatively impact on the achievable downlink aggregate throughput, network fairness and achievement of QoS required by each user [18].…”

Downlink User Power Allocation and Joint Rate Maximization in UAV-Relayed Assisted SWIPT-NOMA System

“…Non orthogonal multiple access technology realizes that multiple users share the same time slot, frequency band and code resources for communication through power domain multiplexing. The dynamic grouping optimization scheme of user cluster can provide convenient preconditions for effectively solving the power allocation problems in mobile communication, which have attracted extensive attention [4,5,6,7]. In reference [4], considering the combinatorial nature of mixed integer nonlinear programming problem, a low complexity suboptimal user grouping scheme is proposed to optimize the power allocation of users and maximize the throughput of the whole system.…”

“…Antonio et al Proposed Masaracchia et at. [7] that the shortcomings of user mobility are not considered in the design of NOMA communication video system, and the mobility of users is considered in NOMA transmission system, which opens a new idea for relevant research. However, the resource allocation problem under dynamic programming is not involved in literature [4,5,6,7].…”