REDCAP NR System Information Acquisition Through Selective PDCCH Monitoring
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Solution Overview
Problem
The current 5G standard lacks a method for reduced capability (REDCAP) user equipment (UE) devices to efficiently acquire system information from a wireless network with reduced power consumption and computational complexity.
Innovation Solution
The UE device determines PDCCH candidates from an extended CORESET, monitors PDCCH, and decodes REDCAP scheduling information to receive REDCAP-specific system information, including support for extended CORESETs and REDCAP-specific RNTI scrambled DCI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single protocol is used for all UE devices to acquire system information, then compatibility is maintained, but power consumption and computational complexity increase for REDCAP devices
Solution Approach 1:
The patent segments the system information acquisition process by introducing separate protocols for legacy UE and REDCAP UE devices. REDCAP devices use a simplified protocol that monitors only a subset of PDCCH candidates and acquires only essential system information, while legacy devices continue using the comprehensive protocol. This segmentation allows REDCAP devices to reduce power consumption and computational complexity by avoiding processing of unnecessary information.
2Loss of information
If standard system information acquisition protocol is used, then complete system information is obtained, but processing time and computational complexity increase for REDCAP devices
Solution Approach 1:
The patent extracts only the essential system information parameters that REDCAP devices need to operate, rather than acquiring complete system information. The REDCAP-specific protocol retrieves minimal necessary information such as basic cell access parameters and essential system configuration, excluding advanced features and optional parameters that REDCAP devices cannot utilize. This extraction approach maintains operational completeness while significantly reducing processing burden.
3Loss of information
If REDCAP devices monitor all PDCCH candidates, then no information is missed, but power consumption increases
Solution Approach 1:
The patent applies partial action by having REDCAP devices monitor only a subset of PDCCH candidates rather than all candidates. The protocol specifies that REDCAP devices monitor a reduced set of control resource sets (CORESETs) and physical downlink control channel (PDCCH) candidates that are most relevant for their operation. This partial monitoring approach ensures that REDCAP devices acquire all necessary scheduling information and system updates while consuming significantly less power compared to monitoring all PDCCH candidates.
Data Source
AI summary
A system, apparatus, method, and non-transitory computer readable medium for system information acquisition for reduced capability NR devices may include a UE device which is caused to, determine a plurality of physical downlink control channel (PDCCH) candidates from a control resource set (CORESET), monitor a PDCCH from the plurality of PDCCH candidates, determine reduced capability (REDCAP) scheduling information from a downlink control information (DCI) received on the PDCCH, and receive REDCAP system information based on the determined REDCAP scheduling information.