RAN Assistance Information Timer for Wireless Cell Change
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Solution Overview
Problem
The existing wireless communication systems face challenges in effectively handling radio access network (RAN) assistance information during cell changes, particularly in inter-RAT and intra-RAT transitions, where it is unclear when dedicated RAN assistance information remains valid, leading to inconsistencies in traffic steering between 3GPP and non-3GPP access networks.
Innovation Solution
A method is introduced where user equipment (UE) receives RAN assistance information with a timer value via dedicated signaling, allowing it to determine the validity of the information and apply it during cell changes. The UE starts a timer upon receiving the information and continues to apply the dedicated RAN assistance information until the timer expires, ensuring consistent interworking policies across different radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated RAN assistance information is provided without a timer mechanism, then the information can be applied immediately, but it is unclear when the information remains valid during cell changes, leading to inconsistencies in traffic steering
Solution Approach 1:
The patent applies preliminary action by including a timer value in the dedicated RAN assistance information before the UE actually needs to use it. This timer value pre-defines the validity period, so when the UE receives the information, it already knows how long to apply it, eliminating the uncertainty about validity duration during cell changes.
Solution Approach 2:
The patent implements dynamics by making the RAN assistance information time-dependent through the timer mechanism. The information is not statically valid indefinitely but dynamically expires after the timer value elapses, allowing the system to adapt to changing network conditions while providing clear validity boundaries.
2Adaptability or versatility
If RAN assistance information is applied indefinitely, then consistency is maintained, but the system cannot adapt to changed network conditions after cell change
Solution Approach 1:
The patent applies periodic action through the timer mechanism that periodically expires and resets. The RAN assistance information remains valid for a specific period defined by the timer value, after which it expires and can be updated with new information better suited to current network conditions, enabling systematic adaptation while maintaining consistency during the validity period.
Solution Approach 2:
The patent implements parameter changes by using the timer value as a dynamic parameter that controls the validity duration of RAN assistance information. This allows the system to transition from static, indefinite validity to dynamic, time-limited validity, enabling adaptation to changing network conditions while maintaining reliability within each validity period.
3Adaptability or versatility
If a timer mechanism is introduced to track validity, then adaptability to cell changes is improved, but the complexity of handling RAN assistance information increases
Solution Approach 1:
The patent applies merging by combining the timer value with the RAN assistance information in a single dedicated signaling message. Instead of implementing a separate, complex timer management system in the UE, the timer value is integrated into the existing information structure, simplifying the overall handling mechanism while still providing the necessary adaptability.
Data Source
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AI summary
A method and apparatus for handling radio access network (RAN) assistance information in a wireless communication system is provided. A user equipment (UE) receives RAN assistance information via dedicated signaling, and starts a timer. Upon performing cell change, the UE determines whether to stop the timer. The cell change may be one of inter- or intra-radio access technology (RAT) cell change. If the UE determines not to stop the timer, the UE applies the received RAN assistance information while the timer is running. That is, the UE may consider that the received RAN assistance information is valid for RAN-assisted interworking while the timer is running.