RedCap NR Random Access Using Dedicated Search Space Configurations
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting terminals with reduced capabilities, 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 and monitor Physical Downlink Control Channel (PDCCH) for Random Access Response using specific ra-ResponseWindow and ra-SearchSpace configurations, with dedicated search spaces and control resource sets in the initial bandwidth part, enabling efficient cell access and system information acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dedicated search spaces and control resource sets are configured for RedCap UEs in the initial bandwidth part, then cell access efficiency and system information acquisition are improved, but device complexity and network configuration overhead increase
Solution Approach 1:
The patent segments the control resource set and search space configurations into dedicated RedCap-specific configurations and general configurations. By creating separate configuration sets for RedCap UEs (with specific parameters like reduced bandwidth and adjusted subcarrier spacing) while maintaining general configurations for other UEs, the system improves RedCap access efficiency without unnecessarily complicating the overall network configuration architecture.
Solution Approach 2:
The patent applies local quality by providing tailored control resource set and search space configurations specifically for RedCap UEs in the initial bandwidth part, while other UEs continue to use standard configurations. This localized optimization ensures that RedCap devices receive appropriate resource allocations suited to their capabilities without affecting or complicating the configuration experience for other device types.
2Use of energy by moving object
If optimized bandwidth and subcarrier spacing are used for RedCap UEs, then power consumption is reduced, but communication performance and network compatibility may deteriorate
Solution Approach 1:
The patent changes key parameters including bandwidth configuration and subcarrier spacing specifically for RedCap UEs in the initial bandwidth part. By adjusting these parameters to match RedCap device capabilities (smaller bandwidth, optimized subcarrier spacing), the patent reduces power consumption while maintaining network compatibility through proper configuration alignment between the network and RedCap devices.
Solution Approach 2:
The patent implements a universal configuration framework that handles both RedCap and non-RedCap UEs through a unified system. The same control resource set and search space configuration mechanisms serve multiple device types, with RedCap-specific optimizations applied only where needed. This multi-functional approach ensures network compatibility is maintained across diverse device types while still enabling power optimization for RedCap devices.
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, monitoring, by the terminal, Physical Downlink Control Channel (PDCCH) for Random Access Response based at least in part on a specific ra-ResponseWindow and a specific ra-SearchSpace.