L4S Protocol Support Determination in Cellular Registration Areas
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Solution Overview
Problem
Current wireless communication systems face challenges in determining whether a wireless communication node supports Low Queuing Latency, Low Loss, and Scalable Throughput (L4S) protocols, especially during mobility events, leading to potential congestion and increased latency.
Innovation Solution
A method where a wireless communication device requests L4S protocol support from an access management function in the core network, queries a network repository function to determine L4S support across a registration area, and performs validation to confirm L4S protocol support, switching to alternative congestion control if L4S is not supported.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the wireless communication device requests L4S protocol support for every session establishment, then congestion management efficiency is improved, but network signaling overhead increases
Solution Approach 1:
The network performs preliminary determination of L4S support status at the registration area level before actual data transmission. The SMF queries the NRF to check L4S support status of wireless communication nodes in the registration area, and this information is cached and reused for subsequent session establishments within the same registration area, avoiding repeated signaling exchanges.
Solution Approach 2:
The L4S support determination mechanism serves multiple functions: it enables congestion management for L4S flows, provides network capability information to UEs, and allows the network to make informed routing decisions. The same NRF query mechanism is used both for initial session establishment and for mobility event handling.
2Adaptability or versatility
If the network determines L4S support at the individual node level, then protocol compatibility is improved, but determination complexity increases
Solution Approach 1:
The patent merges multiple individual node capability checks into a single registration area-level determination. Instead of checking each wireless communication node individually when a session is established, the system determines L4S support at the registration area level by querying the NRF, which returns a unified indication for the entire registration area. This consolidation significantly reduces determination complexity.
Solution Approach 2:
The system applies different determination granularities to different scenarios: registration area-level determination for general session establishment, and individual node-level verification only when mobility events occur or when specific sessions require it. This localized approach optimizes the balance between compatibility and complexity.
3Reliability
If the wireless communication device validates L4S support end-to-end, then protocol reliability is improved, but validation time increases
Solution Approach 1:
The network performs preliminary L4S support validation through NRF queries before actual data transmission begins. The SMF obtains L4S support status information in advance during session establishment, allowing the UE to skip time-consuming end-to-end validation and directly use L4S protocols if supported, thus reducing validation time while maintaining reliability.
Solution Approach 2:
The NRF acts as an intermediary that provides authoritative L4S support status information to both the SMF and UE. Instead of requiring direct end-to-end validation between UE and remote endpoints, the NRF serves as a trusted mediator that pre- validates network support, significantly reducing validation time while maintaining protocol reliability.
4Stability of the object's composition
If the network maintains L4S protocol during mobility events, then service continuity is improved, but network resource consumption increases
Solution Approach 1:
The system dynamically adjusts L4S protocol usage based on mobility events and current registration area L4S support status. When a UE undergoes a mobility event, the network checks the new registration area's L4S support status via NRF query, and only maintains L4S protocol if the new area supports it. This dynamic adaptation ensures service continuity in L4S-supported areas while conserving network resources in areas where L4S is not available.
Data Source
AI summary
Systems, methods, and apparatuses for transmitting, by a wireless communication device, to an access management function (AMF) of a core network, a request for a session to be established with a wireless communication node, the request indicating a low queuing latency, low loss, and scalable throughput (L4S) protocol is to be used for the session, and a registration area corresponding to the wireless communication node, and receiving, by the wireless communication device, via the AMF from a session management function (SMF) of the core network, a response to the request, the response indicating that the L4S protocol is supported by the wireless communication node according to the registration area.