CFRA Preamble Differentiation for Slice-Aware NR Initial Access
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Solution Overview
Problem
Existing NR random access procedures lack the ability to differentiate between UE types, service types, and network slices during the initial access phase, leading to inefficient prioritization and resource allocation for high-priority services or slices.
Innovation Solution
Configuring distinct PRACH and PUSCH resources based on UE/service priority, type, and network slice IDs, allowing early identification and prioritized admission control for high-priority groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single PRACH configuration is used for all UEs during initial access, then the system is simple to implement, but the network cannot differentiate between UE types, service types, or network slices for prioritization
Solution Approach 1:
The patent divides the single PRACH configuration into multiple distinct PRACH configurations (first PRACH configuration and second PRACH configuration), each tailored for specific UE groups, service types, or network slices. This segmentation enables the network to differentiate and prioritize different traffic types while maintaining manageable complexity through structured configuration sets.
Solution Approach 2:
The patent applies local quality by assigning specific PRACH configuration characteristics (such as different time/frequency resources, preamble formats, or power settings) to specific UE groups or service types. High-priority services receive optimized local configurations that differ from standard configurations, enabling differentiated quality of service without requiring complete system redesign.
2Reliability
If PRACH resources are shared among all UEs, then resource utilization is efficient, but high-priority services cannot receive guaranteed transmission reliability during network congestion
Solution Approach 1:
The patent segments PRACH resources into dedicated resources for high-priority services and shared resources for general services. This segmentation ensures that high-priority transmissions have guaranteed access to specific time/frequency resources, preventing them from being blocked by lower-priority traffic while maintaining efficient utilization of shared resources for standard services.
Solution Approach 2:
The patent changes key PRACH parameters (such as preamble format, time slot allocation, frequency resources, or power levels) for different service priorities. High-priority services are assigned parameter sets that provide enhanced reliability characteristics, while standard services use parameter sets optimized for overall resource efficiency, thus resolving the contradiction between reliability and productivity.
3Loss of time
If admission control decisions are delayed until later in the random access procedure, then the procedure is faster for low-priority UEs, but the network loses the opportunity to prioritize high-priority services early in the access process
Solution Approach 1:
The patent implements preliminary action by performing admission control and service differentiation at the very beginning of the random access procedure, specifically during the Msg1 preamble transmission stage. The network pre-configures different PRACH resources for different service types, allowing immediate identification and prioritization of high-priority services before the full random access sequence begins, thus enabling early differentiation without significantly extending overall access time.
Solution Approach 2:
The patent applies local quality by providing differentiated treatment at specific stages of the random access procedure. High-priority UEs receive optimized local configurations for early message transmission (Msg1 and Msg2), while standard UEs follow the conventional timeline. This localized optimization allows prioritization where it matters most without forcing all UEs through extended procedures.
Data Source
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AI summary
For contention free random access (CFRA) with 2-step RA type or 4-step RA type, a network node may configure different physical random access preamble configurations (e.g., different PRACH occasions, preamble index, or preamble format) for different user equipment (UE)/service groups that are associated with different UE priorities, UE types, service priorities, service types, and/or network slices. A UE may select a configuration to use to transmit the random access preamble based on the priority of the UE, the type of the UE, the priority of the service, the type of the service, and/or the network slice. In 2-step RACH, a network node may also configure different msgA PUSCH resources for different UE priorities, UE types, service priorities, service types, and/or network slices.