IAB Relay Handover Control for Parameter-Consistent Donor Switching
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Solution Overview
Problem
Existing handover techniques in Integrated Access and Backhaul (IAB) systems fail to effectively manage handover processing when an IAB node switches connection destinations, leading to potential mismatches in connection parameters and inefficient communication maintenance during mobility.
Innovation Solution
The IAB node withholds transmitting handover control signals to downstream communication apparatuses until a successful handover to a new IAB donor is established, ensuring synchronization and parameter consistency by executing random access processing and completing handover setup before transmitting these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the relay apparatus transmits handover control signals to downstream communication apparatuses immediately, then the handover processing speed is improved, but connection parameter mismatches and communication failures occur when handover fails
Solution Approach 1:
The relay apparatus performs the handover to the new base station apparatus before transmitting handover control signals to downstream communication apparatuses. This preliminary action ensures that the relay apparatus has successfully established connection with the new base station, guaranteeing connection parameter consistency while maintaining efficient handover processing.
2Reliability
If the relay apparatus waits for successful handover before transmitting control signals, then connection parameter consistency is maintained, but handover processing time increases
Solution Approach 1:
The relay apparatus performs handover to the new base station apparatus in advance before notifying downstream communication apparatuses. This preliminary action minimizes the time downstream apparatuses need to wait for handover completion, reducing overall handover processing time while ensuring parameter consistency.
Solution Approach 2:
The handover process is segmented into two independent phases: (1) relay apparatus handover to new base station, and (2) transmission of handover control signals to downstream communication apparatuses. This segmentation allows the first phase to complete successfully before initiating the second phase, ensuring parameter consistency without unnecessary delays.
3Productivity
If handover control signals are transmitted without verifying successful handover, then signaling efficiency is improved, but unnecessary signaling and communication failures occur
Solution Approach 1:
The relay apparatus uses the successful establishment of handover to the new base station apparatus as feedback before transmitting handover control signals to downstream communication apparatuses. This feedback mechanism ensures that control signals are only transmitted when the handover has successfully completed, eliminating unnecessary signaling while maintaining high signaling efficiency.
Solution Approach 2:
The relay apparatus performs preliminary verification of successful handover before transmitting control signals, preventing the harmful effect of unnecessary signaling. By checking handover success in advance, the system avoids transmitting control signals that would lead to communication failures, thus eliminating harmful unnecessary signaling.
Data Source
AI summary
A relay apparatus that relays communication between a base station apparatus and a communication apparatus that is connected to the base station apparatus executes, in a case where the relay apparatus performs a handover to another base station apparatus, control so as to withhold transmitting/receiving a signal for a handover of the communication apparatus between the communication apparatus and the base station apparatus while the relay apparatus is not successful in a handover.