Multi-SIM Dynamic Spectrum Sharing for Paging Collision Control
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Solution Overview
Problem
In multi-SIM devices operating in dynamic spectrum sharing deployments, there is a challenge in optimizing hardware resource usage when multiple network subscriptions overlap, leading to issues such as paging collisions and inefficient spectrum utilization due to simultaneous reception and transmission requirements.
Innovation Solution
The terminal device indicates a need for reduced search space operations and switching gaps through RRC signaling, allowing the gNB to configure appropriate resource allocation and scheduling to avoid paging collisions and optimize connectivity resource sharing between 4G and 5G networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If hardware resources are shared between multiple network subscriptions, then device complexity is reduced, but resource conflicts and paging collisions occur
Solution Approach 1:
The system dynamically adjusts search space configurations and switching gaps based on real-time resource availability and subscription priorities. The gNB configures different search space sets for different subscriptions and dynamically allocates switching gaps to prevent simultaneous transmission conflicts, making the resource sharing adaptive rather than static.
Solution Approach 2:
The patent segments the shared hardware resources by creating separate search space configurations and transmission time slot allocations for different network subscriptions. This logical segmentation prevents resource conflicts while maintaining physical hardware sharing, as each subscription gets dedicated virtual resource pools within the shared physical infrastructure.
2Reliability
If simultaneous reception and transmission are supported for multiple subscriptions, then communication reliability is improved, but spectrum utilization efficiency decreases
Solution Approach 1:
The system implements periodic switching gaps in a structured pattern, allowing simultaneous reception and transmission at different time intervals. Instead of continuous simultaneous operation, the patent uses periodic alternating patterns where one subscription transmits while another receives, then switches periodically, maintaining reliability while improving overall spectrum utilization through time-division multiplexing.
Solution Approach 2:
The gNB pre-configures search space sets and switching gap patterns before communication conflicts occur. By preliminarily establishing the resource allocation framework and switching schedules, the system prevents conflicts before they happen, allowing reliable simultaneous operation without requiring reactive resource arbitration that would reduce spectrum efficiency.
3Reliability
If reduced search space operations are implemented, then paging collision is minimized, but control channel monitoring capability is reduced
Solution Approach 1:
The patent segments the control channel monitoring by creating separate search space set configurations for different subscriptions and purposes. Instead of a single monolithic search space, multiple segmented search spaces are defined with different monitoring parameters, allowing the system to reduce monitoring for specific subscriptions while maintaining adequate monitoring for others, thus reducing paging collisions without completely sacrificing monitoring capability.
Solution Approach 2:
Different search space configurations with varying monitoring densities are applied locally to different subscriptions based on their specific needs. High-priority subscriptions maintain more aggressive monitoring while lower-priority ones use reduced monitoring, optimizing the balance between collision reduction and monitoring capability on a per-subscription basis rather than applying a uniform reduction to all.
Data Source
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AI summary
A method comprising detecting that a first network subscription and a second network subscription are associated with a terminal device, wherein the first network subscription is to a first radio access technology type and the second network subscription is to a second radio access technology type, and dynamic spectrum sharing is utilized for the first network type and the second network type, determining that the first network subscription and the second network subscription utilize, at least partly, same connectivity resources comprised in the terminal device, identifying that an occurrence of a first reception activity regarding the first network subscription occurs, at least partly, simultaneously with a second reception activity regarding the second network subscription, and based, at least partly, on the identifying, transmitting a first indication indicating a need for reduced search space operation to an access node.