RSD Parameter Handling for MA PDU Session Establishment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G wireless communication systems, User Equipment (UE) registered in the 4G system cannot establish a PDN connection as a leg of a Multi-Access (MA) PDU session due to the lack of applicability of MA preferences, which hinders efficient data traffic balancing between 3GPP and non-3GPP access networks.
Innovation Solution
The UE handles Route Selection Descriptor (RSD) parameters to determine if a PDN connection should be established as a user-plane resource of an MA PDU session, by supporting MA PDU session procedures and using mapped EPS parameter descriptions to indicate MA preferences, allowing for the establishment of PDN connections as either a new or existing MA PDU session based on available resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE is registered in 4G system using traditional PDN connectivity procedure, then UE can establish PDN connection, but UE cannot establish PDN connection as a leg of MA PDU session due to lack of MA preference applicability
Solution Approach 1:
The patent applies parameter changes by introducing a new parameter 'multi-access preference' into the RSD (Route Selection Descriptor) structure. This parameter enables 4G-registered UEs to indicate their capability and preference for establishing MA PDU sessions. By modifying the RSD parameter set to include this new attribute, the system allows UE to express MA session establishment intent during PDN connectivity procedure, resolving the contradiction between adaptability and complexity.
Solution Approach 2:
The patent implements universality by making the PDN connectivity procedure serve dual purposes: traditional single-access PDN connection establishment and MA PDU session leg establishment. The same procedure can now result in different outcomes based on the multi-access preference parameter, allowing the procedure to be universal across both 4G and 5G scenarios without requiring separate procedures for each case.
2Productivity
If UE establishes PDN connection as leg of MA PDU session, then traffic distribution across multiple access networks is optimized, but UE must support additional MA PDU session procedures
Solution Approach 1:
The patent applies preliminary action by having the UE indicate multi-access preference and capability during the initial PDN connectivity procedure setup phase. The UE includes the multi-access preference parameter in the PDN connectivity request, allowing the network to pre-determine whether to establish a traditional PDN connection or an MA PDU session leg. This preliminary indication avoids the need for complex post-establishment reconfiguration and enables efficient traffic distribution from the outset.
3Ease of operation
If UE supports MA PDU session procedures, then transparent data traffic balancing between 3GPP and non-3GPP access is enabled, but UE must evaluate and select appropriate RSD parameters
Solution Approach 1:
The patent introduces the multi-access preference parameter as an intermediary element that simplifies the decision-making process. Instead of requiring UE to perform complex evaluation of multiple RSD parameters and access types, the preference parameter acts as a mediator that directly indicates the desired MA PDU session establishment. This intermediary parameter reduces the evaluation complexity while enabling transparent traffic balancing between 3GPP and non-3GPP accesses.
Data Source
AI summary
Methods and apparatus are provided for the UE handling RSD parameters for MA preferences when the UE is in S1 mode. In one novel aspect, the MA PDU preference is applicable for a UE attached to EPS if the UE supports MA PDU session and procedures for PDN connection establishment and a mapped EPS parameter description of an MA preference type of the selected RSD indicates the MA preference. In one embodiment, the selected RSD indicates MA preference when the EPS parameter description of an MA preference type indicates that the PDN connection should be established as a user-plane resource of a multi-access PDU session if the UE supports MA PDU session and procedures for PDN connection establishment. In one embodiment, the PDN connection is established via a PDN connectivity procedure in an EPS or an EPC.