RedCap NR Random Access Using Dual PUSCH Time Allocation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting terminals with reduced capability, such as RedCap UEs, in accessing and obtaining system information due to their limited performance compared to general smartphones, necessitating new methods for NR cell access.
Innovation Solution
A method and apparatus for RedCap UEs to receive System Information Block1 (SIB1) and perform random access procedures using specific configurations of pusch-TimeDomainAllocationList, leveraging search space 0 (SS #0) and control resource set 0 (CORESET #0) in the initial bandwidth part (IBWP) to obtain necessary system information and perform random access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If general terminal access procedures are used for RedCap UEs, then network compatibility is maintained, but access efficiency and resource utilization deteriorate due to limited RedCap UE capabilities
Solution Approach 1:
The patent segments the random access procedure into two distinct paths: one for normal UEs and another specifically for RedCap UEs. The network configures separate RACH resources and parameters for RedCap UEs, allowing them to follow a simplified access procedure that matches their limited capabilities while maintaining compatibility with the overall network infrastructure.
Solution Approach 2:
The patent applies local quality by providing specialized configuration parameters specifically tailored for RedCap UEs within the broader network configuration. The network can selectively apply different pusch-TimeDomainAllocationList configurations based on UE capability, ensuring that RedCap UEs receive optimized parameters for their specific needs without affecting other UE types.
2Productivity
If simplified access procedures are implemented for RedCap UEs, then access efficiency improves, but system complexity increases due to multiple configuration sets
Solution Approach 1:
The patent implements universality by designing a configuration framework where a single set of parameters (pusch-TimeDomainAllocationList) serves multiple purposes: it can be applied to both normal UEs and RedCap UEs, or to different RedCap UE scenarios. This multi-functional approach reduces the need for entirely separate configuration sets while still providing specialized optimization for RedCap UEs.
3Productivity
If RedCap UEs use standard random access procedures, then protocol simplicity is maintained, but resource utilization deteriorates due to inefficient parameter matching
Solution Approach 1:
The patent applies parameter changes by modifying the pusch-TimeDomainAllocationList parameters specifically for RedCap UEs. These parameter changes include adjusting time domain allocation, frequency domain resources, and other physical layer parameters to match the limited processing capabilities and antenna configurations of RedCap UEs, thereby improving resource utilization efficiency.
Data Source
AI summary
A method and apparatus for accessing a NR cell in a mobile communication system are provided. Method for accessing a NR cell includes receiving in a first cell, by a terminal from a base station, a System Information Block1 (SIB1), determining, by the terminal, if the first cell is barred and performing by the terminal, if the cell is not barred, random access procedure based at least in part on a second pusch-TimeDomainAllocationList.