Table 1 Summary of key studies in smart parking systems.

From: Real time smart parking system based on IoT and fog computing evaluated through a practical case study

Ref. and approach

Proposed architecture

Key technologies

Limitations/gaps

Multi-tier Models25,26,27

Multi-tier architectures for pricing structures and contract management

Conceptual pricing models, usability frameworks

Primarily conceptual with limited real-time implementation details

Forecasting & Resource Allocation28,29,30

Models for forecasting parking availability and optimal resource allocation

Predictive analytics, usability approaches

Focused on urban environments; lack localised contextual testing

Broader IoT Applications31

IoT-based system for intelligent transportation (dynamic ride-sharing, data security)

IoT integration, edge/fog computing

Designed for large-scale urban networks; not tailored for smaller, controlled contexts

Middleware-Based Integrated Approach32

Loosely coupled middleware integrating AVP and smart parking systems for both automatic and manual vehicles

Middleware integration, Markov Chain model for usability evaluation

Not evaluated in localised campus settings; focused on overall cost, space availability, and traffic reduction

Image Processing & Sensor-Based Approaches33,34

Three-tier system (Awaisi et al.) with LED displays and multi-area fog nodes. Five-tier fog computing model (Thangam et al.)

Image processing, sensor networks, fog computing

Limited evaluation in non-urban, localised environments

Real-Time Tracking & Dynamic Pricing36

Multi-layered intelligent parking system leveraging resilient edge and cloud computing with dynamic pricing

Real-time tracking, low-power wireless communications, dynamic pricing

Primarily urban focus; challenges in applying to smaller, controlled settings

Practical Urban Implementations37,38

IoT-based smart parking systems with sensor nodes, fog computing, reservations, and camera-based real-time image processing

Sensor networks, fog computing, real-time image processing

Evaluated in urban scenarios; scalability and adaptation to university environments remain unverified

Our Study

Fog-enabled IoT smart parking system tailored for SDU University

Fog computing, local real-time decision-making, reduced reliance on centralised cloud servers

Addresses irregular campus parking demand and limited data centre capacity