The sixth version of wireless communication technologies aspires to build a data-driven, economically viable future enabled by near-instant, secure, unlimited, and environmentally friendly communication [1-7]. To accomplish this, industry and academics have established stringent performance criteria for trust and security, speed, sensing capabilities, dependability, flexibility, and consumption of energy. As a consequence, the 6G or sixth-generation cellular IoT architecture must be developed to meet growing demands and expectations, including larger coverage, improved capacity, ubiquitous connection, and so on [8-13]. As a result, 6G cellular networks must include THz connectivity [14- 17], Holographic multiple inputs and multiple outputs (HMIMO) [18-23], intelligently reflecting surfaces (IRS) [24-29], symbiont radio [30-35], cell-free access to networks [36-42], multi-tier diverse network [43-49], and other technologies [50-56]. Furthermore, 6G is projected to have an artificial intelligence-powered cloud-edge-device cooperating ground-air-space interconnected environment [57-62].
6G cellular IoT needs to offer exact computation and effective connection for a broad variety of devices or things in order to facilitate instantaneous handling or analysis of enormous datasets created by terminal electronic devices, which are considered as the two primary goals of cellular IoT within 6G [63-67].
Automated production [68-72], eHealthcare [73-77], innovative city planning [78-81], intelligent automated homes [82-85], intelligent agriculture [86-89], smart grid support and surveillance [90], and other IoT applications and services will thrive and spread rapidly in 6G networks due to improved coverage, dependability, extremely short end-to-end delays, and so on. Artificial intellect (AI) [91, 92], the machine learning (ML) [93-95], analytics of data (such as analytics of videos for vegetation health investigation in intelligent agriculture [96], remote tracking, security monitoring, etc.) are going to be heavily used in IoT applications and services to reinforce IoT features. As a result, within a 6G [97] Internet of Things or 6G mobile IoT scenario, greater network coverage including extremely short end-to-end communication latency should be guaranteed.
An IRS [98] represents a rectangular metasurface composed of a large number of reflecting surfaces that has lately attracted academic interest because to its capacity to greatly increase the energy and spectrum efficiency of communication systems by changing wireless transmission contexts. IRS pieces with the proper phase shift are capable of reflecting the incoming stream [99, 100]. IRS generates constructive signal aggregation and detrimental interference mitigation at receivers by proactively modifying reflected signal broadcasts. As a consequence, the recipient's quality of services (QoS) can be increased.
The paper intended to compare the effectiveness of a traditional micro cellular interacting against an IRS-enhanced micro cell-based communication in terms of downstream spectral efficiency within the environment of an IoT concept using a two-tier 6G system that includes a micro cellular tier (or layer) functioning beneath a macro cellular tier.