Terminal Anchoring in Wireless Communication Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 5G communication systems, the frequent change of Packet Data Network (PDN) gateways due to user equipment mobility can lead to session disconnection issues when IP sessions are ongoing, and unnecessary triangle routing occurs when using PGW anchoring, which is ineffective for flows not requiring IP session persistence.
Innovation Solution
A method and apparatus for dual anchoring in a wireless communication system that involves receiving attribute information on gateway session persistence, determining the need for additional PDN connections based on this information, and selecting appropriate IP addresses for ongoing flows to minimize gateway changes and avoid ineffective routing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LGW anchoring is used to handle mobile traffic close to access network, then traffic handling efficiency is improved, but session disconnection occurs frequently due to gateway changes
Solution Approach 1:
The patent segments PDN connections into multiple types (first type with LGW anchoring for local traffic, second type with PGW anchoring for persistent sessions). The terminal maintains both types of connections simultaneously, allowing traffic to be routed through appropriate gateways based on session requirements, thus resolving the contradiction between local efficiency and session continuity.
Solution Approach 2:
The patent changes the anchoring gateway parameter dynamically based on traffic flow characteristics. For flows requiring IP session persistence, the system selects PGW anchoring; for local traffic, LGW anchoring is used. This parameter change allows the system to optimize both traffic handling efficiency and session continuity for different traffic types.
2Reliability
If PGW anchoring is used to ensure session persistence, then session continuity is improved, but unnecessary triangle routing occurs reducing efficiency
Solution Approach 1:
The patent applies local quality by assigning different anchoring strategies to different traffic flows based on their specific requirements. Local traffic flows use LGW anchoring for efficient local routing, while persistent session flows use PGW anchoring for session continuity. This localized optimization eliminates unnecessary triangle routing for local traffic while maintaining session persistence where needed.
3Adaptability or versatility
If gateway anchoring is changed frequently to track terminal mobility, then network optimization is improved, but IP sessions are disconnected
Solution Approach 1:
The patent implements a dynamic anchoring strategy where the terminal maintains multiple PDN connections with different anchoring characteristics. The system dynamically selects which connection to use based on traffic flow requirements, allowing the network to adapt to terminal mobility while maintaining session continuity for persistent flows through PGW anchoring.
Data Source
AI summary
The present disclosure relates to a pre-5th-Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4th-Generation (4G) communication system such as Long Term Evolution (LTE). The present invention relates to a method and apparatus for anchoring of a terminal in a wireless communication system. The method for anchoring the terminal in the wireless communication system may include receiving attribute information indicating whether at least one gateway operating as an anchor for at least one default Packet Data Network (PDN) connection supports session persistence, detecting a new flow generated by an application, determining whether a further PDN connection is required for the flow on the basis of the attribute information indicating whether at least one gateway supports session persistence, and if no further PDN connection is required for the flow, using an Internet Protocol (IP) address allocated by the at least one gateway as a source IP address of the flow.