User Equipment Camping on Multiple Downlink Signals
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Solution Overview
Problem
Next-generation wireless communication systems require flexible radio access technologies to support varying quality-of-service parameters and deployment scenarios, as existing LTE systems are inflexible and cannot efficiently manage multiple services with different transmission requirements, such as latency and synchronization needs, within the same frequency band.
Innovation Solution
The system introduces a novel camping concept where user equipment (UE) simultaneously monitors and camps on multiple downlink signals with different transmission parameters, including System Signature Index (SSI) for uplink access and Tracking Area Signal (TRAS) for location information, allowing for dynamic selection based on signal quality and mobility states, enabling efficient network access and paging across different nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single inflexible physical-layer technology is used, then system simplicity is maintained, but the ability to support varying quality-of-service parameters and deployment scenarios deteriorates
Solution Approach 1:
The patent segments the physical-layer technology into multiple independent numerology configurations, each optimized for specific service requirements. Different subcarrier spacings, cyclic prefix lengths, and transmission time intervals are defined as separate configurable parameters, allowing the system to select appropriate segments for different quality-of-service needs without requiring a completely different physical-layer architecture.
Solution Approach 2:
The patent introduces dynamic configurability to the physical-layer technology through multiple numerology options. The system can dynamically adjust subcarrier spacing, cyclic prefix duration, and other transmission parameters based on service requirements, mobility states, and deployment scenarios. This dynamic adaptation enables the same physical-layer technology to support both low-latency services and high-robustness services.
2Adaptability or versatility
If multiple services with different transmission requirements are supported in the same frequency band, then service versatility is improved, but resource allocation complexity increases
Solution Approach 1:
The patent segments the frequency band into different resource pools, each associated with specific numerology configurations suitable for particular service types. This segmentation allows independent resource allocation and management for different services without interfering with each other, reducing the complexity of coordinating multiple services with conflicting requirements.
Solution Approach 2:
The patent applies local quality by assigning different numerology characteristics to different frequency resources based on service requirements. Each service receives resources with locally optimized parameters (subcarrier spacing, cyclic prefix length) matched to its specific transmission needs, enabling efficient resource utilization while maintaining service-specific performance characteristics.
3Loss of time
If shorter transmission time intervals are used, then latency is reduced, but robustness to delay spread deteriorates
Solution Approach 1:
The patent changes the relationship between transmission time interval and robustness by introducing multiple subcarrier spacing options and cyclic prefix configurations. When shorter TTIs are selected for low-latency services, the system simultaneously adjusts subcarrier spacing and cyclic prefix length to maintain robustness against delay spread. This coordinated parameter change allows the system to achieve low latency without sacrificing reliability.
Data Source
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AI summary
Methods and wireless devices for monitoring system information in a wireless communications network. An example method comprises selecting (620) a first downlink signal carrying uplink access configuration information, from among two or more candidate downlink signals carrying uplink access configuration information, based at least in part on signal quality measurements performed on the first downlink signal. The example method further includes selecting (630) a second downlink signal carrying tracking area information, from among two or more candidate downlink signals carrying tracking area information, based at least in part on signal quality measurements performed on the second downlink signal, where the selection of the second downlink signal is independent of the selection of the first downlink signal. The method further comprises camping (640) on the selected first downlink signal to monitor for uplink access configuration information, while simultaneously camping on the selected second downlink signal to monitor for tracking area information.