Session Establishment with Deactivated State Indication
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Solution Overview
Problem
In 5G mobile communication systems, especially in NB-IoT scenarios, the limited number of data radio bearers (DRBs) available to terminal devices can lead to a negative impact on communication quality when the number of activated sessions exceeds a threshold, typically two, causing interference with other devices.
Innovation Solution
A method and device for establishing sessions that include sending a session establishment request with indication information to differentiate between activated and deactivated sessions, allowing the network device to manage session activation and deactivation based on the current number of sessions and priority, thereby preventing exceeding the session threshold and reducing data transmission delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device establishes more activated sessions simultaneously, then the session availability increases, but the communication quality of other NB-IoT devices deteriorates due to resource contention
Solution Approach 1:
The patent applies preliminary action by establishing a deactivated session in advance before it is needed. When the terminal device needs to exceed the activated session threshold, it can quickly activate a pre-established deactivated session rather than going through the full session establishment process, thus maintaining session availability while preventing resource overload on the network
Solution Approach 2:
The patent implements dynamics by allowing sessions to transition between activated and deactivated states. The terminal device can dynamically manage session states based on current network conditions and resource availability, converting deactivated sessions to activated sessions when needed and vice versa, providing flexible adaptation to changing requirements
2Productivity
If a new session is established when the number of activated sessions reaches the threshold, then the session establishment time increases, but the data transmission delay increases as well
Solution Approach 1:
The patent resolves this contradiction by performing preliminary action - establishing the session context and parameters in advance in a deactivated state. When data transmission is needed, the session is already prepared and can be activated immediately, avoiding the time-consuming full establishment process and reducing data transmission delay
Solution Approach 2:
The patent applies segmentation by separating session establishment into two distinct phases: a preliminary phase where session parameters and context are established in deactivated state, and an activation phase where the session becomes operational. This segmentation allows the heavy establishment work to be done in advance without impacting real-time transmission performance
3Loss of information
If the network device does not receive indication information about session type, then the signaling overhead is reduced, but the network device cannot accurately determine session establishment intention
Solution Approach 1:
The patent extracts only the essential information needed for session type identification from the full session establishment message. By including a compact indication field that specifically marks whether a session is deactivated or activated, the patent provides the network device with sufficient information to make accurate decisions without requiring the entire session establishment message to be processed for this purpose
Data Source
AI summary
The present disclosure provides a method for establishing a session, which is applied to a terminal device and includes sending a session establishment request to a network device. The session establishment request is used to request to establish a first session. The session establishment request includes first indication information. The first indication information indicates that the first session is a deactivated session or an activated session. The method also includes receiving a response message of the session establishment request from the network device. If the number of DRBs has reached a number threshold, the terminal device can request the network device to establish a deactivated first session via the first indication information. When the number of DRBs is less than the number threshold, the terminal device or the network device can activate the first session.