PDU Session SSC Mode Selection Reducing Signaling Load
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Solution Overview
Problem
Next-generation mobile communication systems face challenges in supporting high data traffic, increased transfer rates, numerous connections, low latency, and energy efficiency due to resource shortages and user demands for high-speed services, necessitating advanced techniques such as small cell enhancement, dual connectivity, and non-orthogonal multiple access.
Innovation Solution
A method for selecting or supporting session and service continuity modes associated with protocol data units (PDUs) in wireless communication systems, allowing user equipment (UE) to determine the appropriate SSC mode based on application requirements and network policies, reducing unnecessary protocol data unit sessions and reusing existing sessions for efficient data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new PDU session is established for each application requiring session and service continuity, then service continuity is guaranteed, but resource and signaling loads increase
Solution Approach 1:
The patent allows a single PDU session to serve multiple applications by enabling one session to support multiple SSC modes. Instead of establishing separate PDU sessions for each application, the system makes the existing PDU session universal by allowing it to accommodate different SSC mode requirements through mode checking and compatibility determination mechanisms.
Solution Approach 2:
The patent merges multiple application requirements into a single PDU session by combining the SSC mode checking function with the existing session management process. The system combines the capabilities of multiple sessions into one unified session that can handle different continuity requirements through policy-based SSC mode selection.
2Quantity of substance
If existing PDU sessions are reused for applications with different SSC modes, then resource efficiency improves, but service continuity may be compromised
Solution Approach 1:
The patent implements feedback mechanisms where the UE checks the SSC mode of the existing PDU session and compares it with the required SSC mode for the application. The network provides feedback through allowed SSC mode information, and based on this feedback, the system determines whether to reuse the existing session or establish a new one, ensuring service continuity is not compromised.
Solution Approach 2:
The system dynamically determines whether to reuse an existing PDU session or establish a new one based on real-time SSC mode compatibility assessment. The session reuse decision is not static but adapts to the specific SSC mode requirements of each application, making the system flexible in balancing resource efficiency and service continuity.
3Adaptability or versatility
If multiple PDU sessions are established to support different SSC modes, then application-specific continuity requirements are met, but device and network complexity increases
Solution Approach 1:
The patent applies preliminary action by having the network provide allowed SSC mode information during PDU session establishment. This advance information allows the UE to pre-determine whether the existing session can support future applications, avoiding the need for complex real-time decisions and reducing device complexity in session management.
Data Source
AI summary
Disclosed are a method for selecting a session and a service continuity mode in a wireless communication system and a device therefor. Specifically, a method for selecting a session-and-service continuity (SSC) mode associated with a protocol data unit (PDU) session by a user equipment (UE) in a wireless communication system supporting a plurality of SSC modes may comprise the steps of: receiving a data transmission request from an application; checking whether a first PDU session can support an SSC mode associated with the application; and when the first PDU session can support the SSC mode associated with the application, transmitting data of the application to a network by using the first PDU session without sending a request for establishment of a new second PDU session to the network, although an SSC mode of the first PDU session does not match the SSC mode associated with the application.