V2X Handover Scheduling for Periodic Message Continuity
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Solution Overview
Problem
Current wireless vehicular communication systems face challenges in meeting latency requirements during handover processes, particularly for periodic broadcast transmissions, as the handover from one eNB to another may not occur in time to ensure timely delivery of messages.
Innovation Solution
A method and apparatus at the source network node for scheduling radio resource usage, involving the transmission of a first scheduling configuration for periodic resource allocation, handover to a target network node, and ensuring the continuity of periodic resource availability, allowing the mobile device to seamlessly transition and maintain periodicity in resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If handover is performed from source eNB to target eNB, then the mobile device can maintain connectivity when moving out of range, but the handover process causes latency that fails to meet the timing requirements of periodic broadcast transmissions
Solution Approach 1:
The source eNB performs preliminary actions by determining the handover execution time before actual handover occurs, and calculates the appropriate timing for transmitting the handover command to ensure periodic message transmissions are not disrupted. This advance planning allows the system to prepare resource allocations and timing schedules before the handover event, minimizing latency impact on periodic transmissions.
Solution Approach 2:
The system compensates for potential handover delays by adjusting the timing of handover command transmission and resource allocation. The source eNB calculates a timing offset that cushions against handover execution delays, ensuring that periodic broadcast transmissions maintain their required periodicity and timing requirements even during the handover transition.
2Loss of time
If periodic resource allocation is maintained during handover, then latency requirements of periodic messages are met, but coordination between source and target eNB becomes more complex
Solution Approach 1:
The target eNB provides feedback to the source eNB by sending a handover acknowledgement message that confirms the allocated resources and timing information. This feedback loop enables the source eNB to verify that the periodic resource allocation has been properly established at the target eNB, allowing for coordinated timing adjustments while maintaining manageable complexity through structured information exchange.
Solution Approach 2:
The handover command message serves as an intermediary carrier that transports timing information and resource allocation details from the source eNB to the mobile device, and subsequently from the mobile device to the target eNB. This structured intermediary mechanism facilitates coordination between source and target eNB while maintaining periodic transmission requirements, reducing coordination complexity through standardized information formats.
Data Source
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AI summary
A method, operable at a network node of a wireless network, schedules radio resource usage for a mobile device to transmit on a device-to-device connection. The method includes receiving, from the mobile device, an indication of a requirement for transmission resources, comprising at least an indication that the resources are required with a periodicity, transmitting, to the mobile device, an assignment of a first scheduling configuration for the device-to-device connection, comprising at least an indication of periodically recurring radio resources to be used for a plurality of instances of a message transmission on the device-to-device connection, transmitting, to the mobile device, an indication to begin use of the periodically recurring radio resources, and handing over responsibility for providing radio resources for the device-to-device connection from the network node to a target network node such that the availability of radio resources with the periodicity is substantially maintained.