Random Access Signaling for Early eRedCap UE Identification
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Solution Overview
Problem
Existing methods do not provide a way to early identify an enhanced Reduced Capability (eRedCap) UE, which has different capabilities from the RedCap UE, necessitating appropriate scheduling.
Innovation Solution
A method involving the transmission of MSG1 and MSG3 in a random access procedure, utilizing specific random access configurations and logical channel IDs (LCIDs) to distinguish between RedCap and eRedCap UEs, along with bandwidth part (BWP) configuration information, enabling early identification and suitable scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single random access configuration is used for all RedCap UEs, then the configuration process is simple, but eRedCap UEs cannot be early identified and receive inappropriate scheduling
Solution Approach 1:
The patent segments the random access configuration into multiple distinct configurations: a first random access configuration for RedCap UEs and a second random access configuration for eRedCap UEs. This segmentation allows the system to provide tailored configurations for different UE capability groups, enabling early identification and appropriate scheduling for eRedCap UEs while maintaining separate, optimized parameters for each UE type.
Solution Approach 2:
The patent applies local quality by providing different random access configurations tailored to specific UE types. The first random access configuration is optimized for RedCap UE capabilities, while the second random access configuration is optimized for eRedCap UE capabilities. This ensures that each UE type receives locally optimized parameters (such as message size, timing, and resource allocation) matching its specific performance characteristics.
2Adaptability or versatility
If early identification of eRedCap UEs is implemented through separate random access configurations, then appropriate scheduling can be provided, but the system complexity increases
Solution Approach 1:
The patent implements preliminary action by configuring multiple random access configurations in advance during network setup, before any UE access occurs. The network pre-configures the first random access configuration for RedCap UEs and the second random access configuration for eRedCap UEs, including all necessary parameters such as message sizes, timing advances, and resource allocations. This preliminary preparation enables immediate differentiation and appropriate scheduling from the first access attempt without requiring complex real-time analysis.
3Ease of manufacture
If eRedCap UEs use the same bandwidth processing as RedCap UEs, then resource allocation is simplified, but eRedCap UEs cannot process larger bandwidths efficiently
Solution Approach 1:
The patent applies parameter changes by defining distinct random access configurations with different parameters for RedCap and eRedCap UEs. The second random access configuration for eRedCap UEs includes parameters optimized for larger bandwidth processing, such as adjusted message sizes, different timing advances, and modified resource allocations. These parameter changes enable eRedCap UEs to efficiently process bandwidths up to 20 MHz in control channels while maintaining appropriate resource allocation simplicity through pre-configured parameters.
Data Source
AI summary
A method performed by a user equipment (UE) includes transmitting, to a base station, MSG1 related to a random access procedure, receiving a random access response (RAR) from the base station, and transmitting, to the base station, MSG3 scheduled based on an uplink (UL) grant related to the RAR.