Dual Connectivity Protocol Support for Low-Latency XR Sessions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting extended reality (XR) applications in dual connectivity scenarios, particularly in managing the complexity and latency associated with multiple radio access technologies, leading to suboptimal user experience.
Innovation Solution
The implementation of enhanced protocols and mechanisms for dual connectivity in 5G networks, including optimized NR user and control plane protocol stacks, to manage multiple radio access technologies and reduce latency, thereby improving the support for extended reality applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual connectivity with multiple radio access technologies is implemented, then network coverage and reliability are improved, but system complexity and latency increase
Solution Approach 1:
The protocol stack is segmented into distinct user plane and control plane components, each handled by specific network nodes (NG-RAN and Core Network respectively). This segmentation allows independent optimization of each plane, reducing overall system complexity while maintaining dual connectivity reliability.
Solution Approach 2:
A protocol adaptation layer is introduced as an intermediary between the 3GPP NR protocol stack and non-3GPP protocols. This intermediary translates and adapts protocols, enabling seamless dual connectivity without requiring complex direct integration between disparate technologies, thus reducing system complexity.
2Reliability
If dual connectivity with multiple radio access technologies is implemented, then network coverage and reliability are improved, but transmission latency increases
Solution Approach 1:
Protocol stacks and connectivity configurations are pre-established and cached in both user equipment and network nodes before actual data transmission. This preliminary setup eliminates negotiation and establishment delays during real-time XR application transmission, reducing latency while maintaining reliable dual connectivity.
Solution Approach 2:
The protocol adaptation layer maintains continuous active connections across both 3GPP and non-3GPP networks simultaneously, ensuring uninterrupted data flow. This continuous operation eliminates connection establishment delays and maintains low latency throughout the transmission process.
3Loss of time
If optimized protocol stacks are used, then latency is reduced and XR application performance is improved, but implementation complexity increases
Solution Approach 1:
The protocol adaptation layer is designed with universal functionality to handle multiple 3GPP and non-3GPP protocols through a single unified interface. This multi-functional design reduces implementation complexity by avoiding the need for separate specialized handlers for each protocol type, while still achieving low latency through optimized protocol processing.
Data Source
AI summary
A master base station sends, to a secondary base station, a request message comprising a first parameter indicating a protocol data unit (PDU) set content ratio associated with a PDU session of a wireless device. The master base station receives, from the secondary base station, a response message comprising a second parameter indicating that the secondary base station supports PDU set content ratio awareness for the PDU session, and sends, to a core network node, a message, comprising a third parameter indicating that the secondary base station supports PDU set content ratio awareness for the PDU session.