Random Access Procedure Selection in Wireless Bandwidth Parts

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Solution Overview

Problem

Existing wireless systems face challenges in selecting the appropriate type of random access (RA) procedure and resources for user equipment (UE) due to varying scenarios and requirements, leading to inefficiencies in RA processes.

Innovation Solution

The proposed solution involves an apparatus and method for initiating a random access procedure by reconfiguring with sync for a bandwidth part (BWP), determining whether the reconfiguration was initiated for recovery using a lower-layer triggered mobility (LTM) candidate, and selecting between 2-step and 4-step RA types based on BWP configurations and measured reference signal received power (RSRP) thresholds.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the UE performs multiple checks to determine the correct RA type and resources, then the reliability of RA procedure selection is improved, but the device complexity and processing overhead increase

Engineering Contradiction:

ImproveRA procedure selection accuracyVSAvoidRA selection logic complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The network configures multiple BWP pairs in advance, each associated with specific RA type indications (2-step or 4-step). The UE stores these pre-configured associations and simply retrieves the appropriate configuration based on current BWP activation, avoiding complex real-time decision logic.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system changes the indication parameter from complex multi-criteria evaluation to simple BWP association lookup. By encoding the RA type selection criteria into the BWP configuration parameters themselves, the UE only needs to monitor which BWP is active rather than evaluating multiple independent conditions.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If the UE monitors BWP activation/deactivation and RA resource configurations continuously, then the adaptability to changing network conditions is improved, but the energy consumption increases

Engineering Contradiction:

ImproveRA configuration adaptabilityVSAvoidUE energy consumption

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The patent extracts the RA type selection logic from continuous monitoring and isolates it to BWP configuration events. The UE only processes RA resource information when BWP activation or deactivation occurs, rather than continuously monitoring all RA parameters, significantly reducing energy consumption while maintaining adaptability.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If the system provides both 2-step and 4-step RA resources in the same BWP, then the versatility of RA procedures is improved, but the difficulty of detecting and measuring the correct resources increases

Engineering Contradiction:

ImproveRA procedure versatilityVSAvoidRA resource identification difficulty

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent applies local quality by associating different RA resource characteristics (2-step vs 4-step) with different BWP configurations. Each BWP pair has locally optimized RA resources configured according to its specific characteristics, allowing the UE to identify the correct resources simply by determining which BWP is active, rather than searching through mixed resources.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12328772B1Performing random access procedure in a wireless communication system

Publication Date: 2025.06.10 AERKODO LLC

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.