Handover Random Access Procedure Selection via Indicator
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Solution Overview
Problem
Determining the appropriate type of random access (RA) procedure to perform during a handover in wireless communications is challenging due to differences in RA procedures between source and target base stations, which can lead to inefficiencies and increased latency.
Innovation Solution
The system identifies the type of RA procedure by using indicators included in messages sent between devices involved in the handover, such as wireless devices, source base stations, and core network devices, allowing for the selection between two-step and four-step RA procedures based on specific conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If different RA procedures are performed at source and target base stations during handover, then communication can be initiated, but latency increases and efficiency decreases
Solution Approach 1:
The source base station performs preliminary actions by determining the target base station's RA procedure type before handover occurs, and includes this information in handover messages. This allows the wireless device to be pre-configured with the correct RA procedure type for the target cell, eliminating delays during the actual handover process.
Solution Approach 2:
The system implements feedback mechanisms where the source base station receives information about the target base station's RA procedure type through handover messages, and this feedback is used to configure the wireless device appropriately. The AMF also provides feedback by including RA procedure type indicators in NAS messages during handover.
2Productivity
If RA procedure type is not determined beforehand during handover, then device complexity is reduced, but handover efficiency deteriorates
Solution Approach 1:
The patent introduces intermediary elements (source base station, target base station, and AMF) that handle the complexity of RA procedure type determination. These intermediaries exchange information about RA procedure types through standardized messages, shielding the wireless device from complexity while enabling efficient handover.
Solution Approach 2:
The handover messages serve multiple functions: they transmit mobility information, configure radio resources, and convey RA procedure type indicators. This multi-functionality reduces the need for separate signaling mechanisms, thereby reducing overall system complexity while maintaining high handover efficiency.
Data Source
AI summary
Systems, apparatuses, and methods are described for wireless communications. Random access procedures may include various types of procedures, such as 4-step or 2-step random access procedures. One or more indicators may be included in one or more messages for a handover to indicate a type of a random access procedure.