The advent of 5G mobile networks represents a monumental shift in wireless communication technology, promising enhanced data rates, reduced latency, and the seamless connection of myriad devices. This paper comprehensively analyzes resource allocation strategies within 5G networks, specifically focusing on CRAN. Through systematic categorization, we explore various resource allocation elements and their impact on service quality, reliability, and efficiency. The research highlights the imperative of sophisticated resource management to support diverse services like massive mobile telecommunication (MTC), ultra-reliable low latency communication (URLLC), and enhanced mobile broadband (eMBB). By examining recent innovations and resource allocation algorithms, this study provides a foundation for understanding and improving the performance of 5G networks to meet the escalating demands of modern connectivity.