Abstract: In order to meet the multiscale latency requirements of differentiated services while maintaining resource redundancy, it is necessary for the relay nodes involved in the multi-hop data transmission paths of computational load source-destination to coordinate the allocation of bandwidth resources. A collaborative bandwidth resource reservation method for distribution substations based on joint multiscale latency constraints is proposed. First, a system model for cooperative bandwidth resource reservation at distribution substations, adapted to computational load spatiotemporal transfer, is established. Next, an optimization problem for single-substation bandwidth resource allocation under given bandwidth constraints and aimed at multi-scale delay requirements is designed. Finally, under differentiated available bandwidth constraints, a cooperative reservation optimization problem for multi-substation bandwidth resources is formulated. An adaptive water-filling strategy is designed to solve this problem based on the feedback of the optimal solutions for resource allocation at each substation. Simulations analysis show that the proposed method, via its unique resource reservation mechanism, flexibly adapts to random access and latencysensitive characteristics of heterogeneous distribution services, ensures the spatiotemporal transfer capabilities of computational load indistribution substations, and facilitates the efficient utilization of distributed compute resources.

Key words: bandwidth resources, collaborative reservation, multi-scale latency, joint constraint, distribution substation