Parallel Random Access in Dual-Connectivity Handover Failure Handling
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Solution Overview
Problem
In wireless communications systems, performing handovers in dual connectivity scenarios often results in increased time duration due to the sequential execution of random access procedures with target master and secondary nodes, leading to inefficiencies and potential data retransmissions or duplicates.
Innovation Solution
User equipment initiates parallel random access procedures with target master and secondary nodes, allowing data transfer with the secondary node before completing the procedure with the master node, and implements mechanisms to avoid redundant data transmissions upon failure of the master node procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential random access procedures are performed with target master and secondary nodes, then handover reliability is improved, but handover time duration increases
Solution Approach 1:
The UE performs the random access procedure with the target secondary node before completing the procedure with the target master node. This preliminary action allows data transfer to be established earlier with the secondary node, reducing overall handover time while maintaining reliability through coordinated failure handling between the two nodes
Solution Approach 2:
The handover procedure is segmented into independent random access procedures for the master node and secondary node. These segmented procedures can be executed in parallel rather than sequentially, allowing the UE to establish connections with both nodes simultaneously and reduce total handover duration
2Duration of action of moving object
If parallel random access procedures are initiated with target master and secondary nodes, then handover time is reduced, but risk of redundant data transmissions increases
Solution Approach 1:
The target master node and target secondary node exchange feedback information about the status of random access procedures. When one node detects failure of its random access procedure, it notifies the other node, which then terminates its procedure and avoids redundant data transmissions. This feedback mechanism enables parallel execution while preventing data loss or duplication
Solution Approach 2:
The system prepares failure handling mechanisms in advance by establishing feedback channels between target master and secondary nodes before the handover completes. This preliminary anti-action ensures that if one random access procedure fails, the other node can immediately detect and counteract potential redundant transmissions before they occur
Data Source
AI summary
Methods (1500, 1600, 1700, 1800, 1900), systems (1000, 1400) and devices (705, 805, 1005, 1105, 1205, 1405) for wireless communications are presented. A method (1500, 1600) may include the following operations. A UE determines to perform a handover from a first source device in a first network to a first target device in the first network and from a second source device in a second network to a second target device in the second network (1505, 1605). The UE identifies a time interval for performing a first random access procedure with the first target device in the first network (1510, 1610). The UE initiates a first random access procedure with the first target device (1515, 1615). The UE performs a second random access procedure successfully with the second target device in the second network during the time interval (1520, 1620). The UE transmits or receives from the target device in the second network before the UE finishes performing the first random access procedure with the first target device in the first network (1525, 1630).