UE Paging Offset Configuration for Multi-SIM Collision Avoidance
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Solution Overview
Problem
Multi-SIM user equipment (UE) devices experience paging collisions due to overlapping paging occasions in different networks, leading to missed paging messages, particularly when equipped with single-TX/single-RX capabilities.
Innovation Solution
The UE determines paging collisions and initiates a UE ID reassignment procedure with the network to change paging frames/occasions, adjusts NAS and RRC parameters, or changes the current UE ID to resolve collisions, utilizing specific actions tailored for 5GC or EPC networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If paging occasions are used for receiving pagings from multiple networks, then paging reception capability is improved, but paging collisions occur leading to missed pagings
Solution Approach 1:
The paging occasion resources are segmented by assigning different offset values to different networks. The UE calculates separate paging occasions for each network using network-specific offset values, thereby dividing the paging reception process into distinct time resources for each network, avoiding collisions while maintaining multi-network paging capability
Solution Approach 2:
The patent introduces a new dimension for resource allocation by using offset values in the time domain to differentiate paging occasions across networks. Instead of relying solely on frequency or code division, the system adds temporal offset as an additional dimension, allowing UEs to receive pagings from multiple networks without collision by monitoring paging occasions at different time offsets
2Reliability
If offset values are configured for paging occasion calculation, then paging collision is avoided, but signaling overhead increases
Solution Approach 1:
The patent changes the parameter of paging occasion calculation by introducing offset values that can be configured by the network. These offset parameters are transmitted through existing signaling mechanisms (system information or RRC signaling), allowing the network to control paging occasion timing without requiring entirely new signaling protocols, thus balancing collision avoidance with signaling efficiency
Solution Approach 2:
The UE autonomously calculates its paging occasions using the configured offset values and its own identity (IMSI or 5G-S-TMSI). This self-service mechanism eliminates the need for the network to explicitly assign specific paging occasion resources to each UE, reducing signaling overhead while maintaining reliable collision-free paging reception
3Adaptability or versatility
If UE monitors paging occasions for multiple networks, then multi-SIM functionality is improved, but complexity of paging management increases
Solution Approach 1:
The paging management process is segmented by network identity, with separate offset values and calculation procedures for each registered network. The UE maintains distinct paging occasion schedules for different networks using their respective offset parameters, organizing the complexity through clear separation of paging management for each network while supporting multi-SIM functionality
Data Source
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AI summary
A method for a user equipment (UE) for performing a paging reception is provided. The method includes determining whether the UE registers to a first network associated with an Evolved Packet Core (EPC) network; determining whether to transmit a requested offset value for a paging occasion calculation to the first network after the UE determines that the UE registers to the first network; transmitting, to the first network, the requested offset value after the UE determines to transmit the requested offset value to the first network; receiving, from the first network, a configured offset value for the paging occasion calculation; forwarding, by a Non-Access-Stratum (NAS) layer of the UE, to a lower layer of the UE, the configured offset value; and performing the paging reception based on a first UE identity (ID), wherein the first UE ID is determined based on the configured offset value.