Adaptive Paging Occasions With SSB-Linked RACH Configurations
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently adapting paging occasions to meet the increasing demand for wireless data traffic and support various vertical applications, particularly in 5G/NR systems operating at higher frequencies.
Innovation Solution
The system adapts paging occasions by configuring user equipment (UE) and base stations (BS) to associate random access channel (RACH) occasions and preambles with synchronization signal blocks (SSBs) based on specific patterns, allowing for selective transmission and monitoring of random access preambles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SSB patterns are configured with different RACH configurations, then the system can support diverse application requirements and vertical applications, but the device complexity and configuration management increase
Solution Approach 1:
The system dynamically selects between first and second RACH configurations based on the activated SSB pattern, allowing the random access procedure to adapt to different service requirements (e.g., coverage enhancement, low latency) without requiring static configuration for all scenarios. The UE determines which RACH configuration to use based on the current SSB pattern activation status.
Solution Approach 2:
Different RACH configurations are associated with different SSB patterns to provide localized optimization for specific scenarios. The first RACH configuration may be optimized for coverage enhancement while the second may be optimized for low latency applications, allowing each SSB pattern to have specialized characteristics tailored to its intended use case.
2Productivity
If the system configures multiple RACH configurations for different SSB patterns, then random access performance can be optimized for specific scenarios, but the processing complexity at UE and BS increases
Solution Approach 1:
The UE and BS are pre-configured with multiple RACH configurations and SSB patterns before actual random access occurs. This preliminary configuration allows the system to quickly switch between different random access procedures based on the activated SSB pattern without requiring complex real-time processing or configuration generation during the random access event itself.
3Adaptability or versatility
If SSB patterns are activated and deactivated dynamically, then the system can adapt to changing traffic conditions and support 5G/NR requirements, but the synchronization and association management becomes more difficult
Solution Approach 1:
The system uses feedback mechanisms where the BS indicates to the UE which SSB pattern is currently activated, and the UE responds by selecting the appropriate RACH configuration based on this indication. This feedback loop ensures that both sides maintain synchronized understanding of the current configuration state, reducing errors in association management despite dynamic changes.
Data Source
AI summary
A method of operating a UE includes receiving, a configuration for a first SSB pattern, a configuration for a second SSB pattern, and a first RACH configuration, and receiving an indication activating an SSB pattern. The method also includes determining whether the activated SSB pattern is the first SSB pattern, and in response to a determination that the activated SSB pattern is the first SSB pattern: associating a ROs configured by the first RACH configuration to a first plurality of SSBs transmitted according to the first SSB pattern, associating RA preambles configured by the first RACH configuration to the first plurality of SSBs, selecting an SSB from the first plurality of SSBs; selecting, from the ROs, an RO corresponding to the selected SSB, selecting, from the RA preambles, an RA preamble corresponding to the selected SSB; and transmitting the selected RA preamble in the selected RO.