Network-Guided WD Cell Reselection Using Slice-Specific Priority Sets
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Solution Overview
Problem
Current wireless communication systems lack a mechanism for network nodes to signal frequency priorities and slice associations dynamically to wireless devices in IDLE/INACTIVE mode, leading to potential overload and inefficient distribution of devices across cells and frequencies.
Innovation Solution
Network nodes broadcast multiple sets of parameters associated with different slices and services, and provide indications for wireless devices to select appropriate parameters based on their registered slices, enabling dynamic frequency priority adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the network provides a single set of frequency priorities to all WDs, then the signaling mechanism is simple, but WDs cannot follow slice-specific frequency priorities leading to inefficient distribution and potential overload
Solution Approach 1:
The network node segments the frequency priority information into multiple parameter sets, each associated with a specific network slice. Instead of providing a single universal priority set, the system divides the priorities into slice-specific groups (e.g., first parameter set for first slice, second parameter set for second slice), allowing WDs to receive tailored frequency priorities based on their slice requirements.
Solution Approach 2:
The network node performs preliminary action by broadcasting multiple parameter sets in advance, each tagged with its associated slice identifier. WDs receive and store these pre-configured parameter sets before needing to make cell reselection decisions, enabling them to quickly select the appropriate priority set based on their registered slice without real-time computation or additional signaling overhead.
2Reliability
If all WDs camp on the same cell frequency, then the WD distribution is simple, but the network experiences overload when WDs enter CONNECTED mode
Solution Approach 1:
The system applies local quality by providing different frequency priority configurations to different WDs based on their specific slice requirements. Instead of uniform treatment, each WD receives localized priority information tailored to its slice, enabling differentiated cell reselection behavior that distributes load appropriately across the network infrastructure.
Solution Approach 2:
The network node implements feedback by monitoring WD distribution patterns and adjusting the frequency priorities in the parameter sets accordingly. When certain cells or frequencies become overloaded, the network can update the broadcast parameters to guide WDs toward less congested resources, creating a dynamic feedback loop that maintains balanced load distribution.
3Adaptability or versatility
If the network broadcasts multiple sets of parameters, then slice-specific priorities can be supported, but the broadcast signaling overhead increases
Solution Approach 1:
The broadcast signaling mechanism is enhanced to serve multiple functions simultaneously. The same broadcast channel carries both the traditional cell reselection parameters and the new slice-associated parameter sets. By making the broadcast system multi-functional, the network avoids creating separate dedicated signaling channels for each slice, thereby supporting adaptability without proportionally increasing overall signaling overhead.
Data Source
AI summary
A method, network node and wireless device for network guided wireless device (WD) cell reselection are disclosed. According to one aspect, a method includes obtaining an indication of a set of parameters of a plurality of sets of parameters, the parameters in a set including at least one index and at least one priority, the index used to configure the WD to select a frequency priority based at least in part on the index. The method further includes selecting one of a network slice, frequency and service, based at least in part on the index and included in the set of parameters.