An Information-Theoretic Metric for Semantic Value of Spatiotemporal Information

With the explosive growth of network scale and data volume, wireless communication is facing an increasingly severe limitation of spectrum resources.

Semantic communication has emerged as a promising paradigm to break the bandwidth bottleneck by transmitting significant task-oriented semantic information rather than raw data.

In practical real-time wireless applications, semantics of information exhibit diverse spatial and temporal correlations depending on intrinsic dynamics of source and extrinsic dynamics of environment.

Motivated by this observation, this paper develops a novel information-theoretic metric to quantify the semantic value of spatiotemporal information.

Specifically, a semantic value of information (SVoI) framework is proposed based on the mutual information, which characterises the reduction in uncertainty when predicting an unknown system state using past semantic spatiotemporal correlated observations.

Focusing on general Gaussian Markov models, closed-form expressions of the SVoI are derived.

Effects of both separable and coupled spatiotemporal correlations on SVoI are further investigated analytically.

Numerical simulations are conducted to validate the theoretical analysis of SVoI and its bounds.

The proposed SVoI metric jointly captures the impact of semantic spatiotemporal correlation of source, timeliness of information, and channel conditions, which could serve as an effective optimisation objective for the design of next-generation semantic-aware communication systems.