Semantic Radio Access Networks: Architecture, State-of-the-Art, and Future Directions

TL;DR

This paper reviews the integration of Semantic Communication into Radio Access Networks, highlighting recent advancements, architecture, challenges, and future research directions for enhancing wireless communication systems.

Contribution

It provides a comprehensive survey of Semantic RAN, covering architecture, techniques, standardization, and future challenges, which was lacking in prior literature.

Findings

Semantic RAN improves spectrum efficiency and interference resilience.

Review of techniques across all network layers.

Identification of key research challenges and future directions.

Abstract

Radio Access Network (RAN) is a bridge between user devices and the core network in mobile communication systems, responsible for the transmission and reception of wireless signals and air interface management. In recent years, Semantic Communication (SemCom) has represented a transformative communication paradigm that prioritizes meaning-level transmission over conventional bit-level delivery, thus providing improved spectrum efficiency, anti-interference ability in complex environments, flexible resource allocation, and enhanced user experience for RAN. However, there is still a lack of comprehensive reviews on the integration of SemCom into RAN. Motivated by this, we systematically explore recent advancements in Semantic RAN (SemRAN). We begin by introducing the fundamentals of RAN and SemCom, identifying the limitations of conventional RAN, and outlining the overall architecture of SemRAN. Subsequently, we review representative techniques of SemRAN across physical layer, data link layer, network layer, and security plane. Furthermore, we envision future services and applications enabled by SemRAN, alongside its current standardization progress. Finally, we conclude by identifying critical research challenges and outlining forward-looking directions to guide subsequent investigations in this burgeoning field.