Wireless Random Access Selection Using BWP and RSRP Conditions
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Solution Overview
Problem
Wireless systems face challenges in selecting the appropriate type and resources for random access procedures, such as 2-step or 4-step RA, due to varying scenarios and requirements, leading to inefficiencies in UE operations.
Innovation Solution
A method for determining the appropriate RA procedure and resources based on BWP configuration, LTM candidate configurations, and RSRP thresholds, allowing for 2-step or 4-step RA selection based on specific conditions, including the use of dedicated and common RA resources, PDCCH orders, and MAC CE indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE performs random access procedures with multiple types and resource configurations, then the adaptability to different scenarios is improved, but the device complexity and operation difficulty increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the random access procedure type (2-step or 4-step) and resource selection based on varying conditions such as RSRP thresholds, BWP configurations, and LTM candidate states. The UE changes operational parameters according to measured signal quality and configuration flags, enabling adaptability without requiring complex decision logic for every scenario.
Solution Approach 2:
The patent implements dynamics by making the random access procedure selection flexible and condition-dependent rather than static. The UE dynamically determines whether to perform 2-step or 4-step RA based on real-time conditions including RSRP measurements, BWP configuration status, and LTM recovery requirements, allowing the system to adapt to changing wireless conditions while maintaining manageable complexity through structured decision criteria.
2Productivity
If the UE selects the correct RA procedure type and resources based on initiation purpose, then the operation efficiency is improved, but the difficulty of detecting and measuring the correct procedure increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with multiple random access procedure types (2-step and 4-step) and their associated resource configurations before the actual random access is needed. The network provides advance configuration information including RSRP thresholds, BWP settings, and LTM candidate configurations, enabling the UE to efficiently select the appropriate procedure based on pre-established criteria rather than determining everything in real-time.
Solution Approach 2:
The patent implements feedback mechanisms where the UE measures RSRP values and compares them against configured thresholds to determine the appropriate random access procedure type. The system uses feedback from signal quality measurements and configuration status to guide the selection process, making the determination of the correct RA type more straightforward through structured comparison and decision logic based on measured parameters.
Data Source
AI summary
A method comprising initiating a random access (RA) procedure, by a reconfiguration with sync, for a bandwidth part (BWP), in circumstances where the reconfiguration with sync was not initiated for recovery using an lower-layer triggered mobility (LTM) candidate configuration, in circumstances where the BWP was configured with the dedicated contention free RA resources for the 4-step RA type, performing 4-step RA, in circumstances where the active BWP was not configured with the dedicated contention free RA resources for the 4-step RA type: in circumstances where the BWP was configured with the dedicated contention free RA resources for the 2-step RA type, performing 2-step RA, in circumstances where the BWP was not configured with the dedicated contention free RA resources for the 2-step RA type, performing 4-step RA; in circumstances where the reconfiguration with sync was initiated for recovery using an LTM candidate configuration: in circumstances where the BWP is configured with RA resources for 2-step RA type: in circumstances where the BWP is not configured with RA resources for 4-step RA type random access, performing 2-step RA, in circumstances where the BWP is configured with RA resources for 4-step RA type: in circumstances where the measured RSRP of the downlink pathloss reference is above the message-A threshold, performing 2-step RA, and in circumstances where the measured RSRP of the downlink pathloss reference is not above the message-A threshold, performing 4-step RA is disclosed.