UE Random Access Reporting for Long-Preamble Resource Allocation
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Solution Overview
Problem
Existing 3GPP TSs for New Radio (NR) wireless networks do not allow user equipment (UE) to fully report random access (RA) resources for long preambles, limiting network optimization in reducing collision probability, access setup delays, and energy consumption.
Innovation Solution
Enhancements to RA reporting by introducing an OffsetToCarrier field and extending the msg1-SubcarrierSpacing field to include subcarrier spacings for long preambles, allowing UE to report frequency offsets and subcarrier spacings, enabling better network resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing 3GPP TS reporting mechanisms are used, then device complexity is reduced, but measurement precision of RA resources is insufficient
Solution Approach 1:
The RA resource reporting is segmented into multiple independent fields: offset-to-carrier field for frequency offset, msg1-SubcarrierSpacing field for subcarrier spacing, and msg1-FrequencyStart field for frequency start. This segmentation allows each parameter to be reported independently with appropriate precision without increasing overall device complexity.
Solution Approach 2:
The reporting mechanism adds new dimensions to the reporting structure by introducing frequency offset reporting (offset-to-carrier) and subcarrier spacing reporting (msg1-SubcarrierSpacing) alongside the existing frequency start information. This multi-dimensional approach enables comprehensive RA resource characterization.
2Reliability
If RA resource information is not fully reported, then device complexity is reduced, but collision probability increases
Solution Approach 1:
The network receives feedback from the UE about the actual RA resources used (frequency offset, subcarrier spacing, frequency start). This feedback enables the network to accurately assess collision probability and optimize RA resource allocation to minimize collisions between multiple UEs.
Solution Approach 2:
The reporting mechanism captures critical RA parameters (frequency offset, subcarrier spacing, frequency start) that determine resource collision probability. By reporting these parameters, the network can identify and resolve collisions through parameter adjustments in resource allocation.
3Loss of time
If RA resources are not optimized, then device complexity is reduced, but access setup delays increase
Solution Approach 1:
The UE reports RA resource information (frequency offset, subcarrier spacing, frequency start) before actual RA attempts. This preliminary information allows the network to pre-optimize resource allocation and configure appropriate RA parameters, reducing access setup delays before the RA procedure begins.
Solution Approach 2:
The system enables self-service optimization where the UE autonomously measures and reports its RA resource characteristics, and the network autonomously optimizes resource allocation based on this information. This reduces the need for manual network configuration and drive tests while minimizing access delays.
4Use of energy by moving object
If RA resources are not optimized, then device complexity is reduced, but energy consumption increases
Solution Approach 1:
The UE autonomously measures RA resource characteristics and reports them without requiring extensive network measurement campaigns or drive tests. This self-service approach reduces the energy and resources needed for network optimization while enabling energy-efficient RA operation through proper resource allocation.
Solution Approach 2:
By reporting and optimizing RA parameters (frequency offset, subcarrier spacing, frequency start), the network can allocate resources more efficiently, reducing the number of RA attempts needed and thereby reducing UE energy consumption during the access procedure.
Data Source
AI summary
The present application relates to devices and components including apparatus, systems, and methods for reporting random access configuration information in wireless networks.