Consistency-Aware Multipath Transport (CAMP) toward Interactive Multimodal LLM-Based Systems

With the prosperity of generative large language models (LLMs), interactive LLM-based services, such as digital humans, have imposed new stringent requirements on low latency and high multimodal consistency. Traditional interactive LLM-based systems typically transmit multimodal content over a single network path, thereby failing to exploit the advantages offered by multipath networks. Even when multipath transport mechanisms are adopted, single-stream encapsulation does not enable differentiated management of heterogeneous modalities. However, naively separating modalities into multiple streams further introduces inter-modal arrival inconsistency. To address these challenges, this document specifies CAMP, a consistency-aware multipath transport design over the Multipath QUIC (MPQUIC) protocol. First, CAMP defines a three-stream separation encapsulation format to support modality-differentiated transmission. Second, it incorporates a transport-layer consistency- aware multipath scheduler to reduce inter-modal arrival time deviation across network paths. Third, it specifies a client-side application-layer alignment mechanism that operates in coordination with the transport scheduler. To the best of our knowledge, this is the first specification to address multipath-enabled multimodal consistency guarantees for interactive LLM-based systems.