UE Route Selection Policy Deferment for Session Continuity
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Solution Overview
Problem
In 5G wireless communication networks, the updating of user equipment (UE) route selection policy (URSP) rules can disrupt ongoing voice or video calls and other critical applications by causing them to drop or experience degraded quality, as the network switches to new packet data unit (PDU) sessions with potentially lower priority or quality settings.
Innovation Solution
The UE identifies the application type and corresponding PDU session mapping, defers URSP re-evaluation until specific conditions are met, and triggers re-evaluation to apply the highest priority URSP rules during ongoing sessions, ensuring continuous and high-quality service by maintaining the current session until it ends or specific conditions are fulfilled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE re-evaluates URSP rules when updated by the network, then the UE can utilize higher priority slices and improved service quality, but ongoing voice or video calls may be dropped and service continuity is disrupted
Solution Approach 1:
The patent applies dynamics by making the URSP rule evaluation timing adaptive rather than static. The UE dynamically adjusts when to re-evaluate URSP rules based on the type of service currently active. For session-based services like voice and video calls, the UE defers re-evaluation until the session ends, ensuring continuity. For other services, the UE can re-evaluate immediately to utilize higher priority slices, thus adapting the evaluation behavior to service requirements.
Solution Approach 2:
The patent applies preliminary action by having the UE identify and classify the service type (session-based vs. non-session-based) in advance before network URSP updates arrive. This preliminary classification allows the UE to pre-determine the appropriate evaluation strategy, preventing service disruption before it occurs by preparing the correct response mechanism ahead of time.
2Reliability
If the UE continues using the old PDU Session after network URSP rule updates, then service continuity is maintained, but the UE cannot utilize higher priority slices or improved service quality
Solution Approach 1:
The patent applies dynamics by implementing service-type-dependent URSP evaluation behavior. The system dynamically switches between two modes: for session-based services, it maintains the current PDU session to ensure continuity; for non-session-based services, it transitions to the updated PDU session to utilize higher priority slices. This dynamic adaptation resolves the contradiction by making the behavior context-aware.
Solution Approach 2:
The patent applies local quality by applying different URSP evaluation strategies to different service types locally. Instead of a uniform approach, the UE applies session-based service logic to voice/video calls and non-session-based logic to other applications. This localized differentiation allows each service type to receive the appropriate treatment, maintaining continuity where needed and improving quality where applicable.
3Productivity
If the UE re-evaluates URSP rules immediately upon network update, then the UE can switch to optimal data paths for non-critical applications, but critical applications experience service disruption and call drops
Solution Approach 1:
The patent applies dynamics by implementing conditional URSP re-evaluation based on service type. The system dynamically determines whether to re-evaluate URSP rules immediately or defer the evaluation based on whether the current service is session-based or not. This dynamic decision-making enables data path optimization for non-critical applications while protecting critical applications from disruption.
Solution Approach 2:
The patent applies local quality by applying different evaluation timing strategies to different application types. Critical session-based applications receive immediate protection through deferred evaluation, while non-critical applications can benefit from immediate re-evaluation and path optimization. This localized approach ensures that productivity improvements do not come at the cost of service availability for critical applications.
Data Source
AI summary
A user equipment (UE) and a method to maintain service session continuity in a wireless communication network are provided. The UE includes a transceiver, memory storing one or more computer programs, and one or more processors communicatively coupled to the transceiver and the memory, wherein the one or more computer programs include computer-executable instructions that, when executed by the one or more processors, cause the UE to identify an application running on the UE and a corresponding packet data unit (PDU) session mapping for the application data route, defer a re-evaluation of UE route selection policy (URSP), until at least one condition has been met, based on an application type, and trigger the re-evaluation and applying highest priority URSP rules for traffic for the identified application during an ongoing service session based on the application type.