Sidelink Resource Reallocation for Half-Duplex Conflict Avoidance
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Solution Overview
Problem
Existing wireless communication systems face challenges in coordinating sidelink resource allocation, leading to half-duplex scheduling conflicts due to base stations being unaware of the intended receiver of sidelink transmissions, resulting in simultaneous transmitting and receiving by UEs.
Innovation Solution
UEs detect potential scheduling conflicts and alert the serving cell, receiving sidelink control information with serving cell identifiers, and request grant reconfigurations or provide destination identifiers to avoid half-duplex conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the base station allocates resources for sidelink communications without knowing the intended receiver, then resource allocation simplicity is maintained, but half-duplex scheduling conflicts occur
Solution Approach 1:
The patent implements a feedback mechanism where the receiving UE sends backside information to the base station, including the identifier of the transmitting UE and the intended receiver. This feedback loop enables the base station to acquire complete scheduling information and resolve half-duplex conflicts by adjusting resource allocations based on the received feedback, thus maintaining operational simplicity while ensuring reliable conflict avoidance.
Solution Approach 2:
The patent applies preliminary action by having the receiving UE detect potential scheduling conflicts before they occur and proactively send backside information to the base station. This advance notification allows the base station to preemptively adjust resource allocations, preventing half-duplex conflicts before they can impact communication reliability.
2Productivity
If UEs transmit and receive simultaneously, then communication efficiency increases, but half-duplex constraints cause scheduling conflicts
Solution Approach 1:
The patent implements dynamics by enabling flexible resource allocation where the base station can dynamically adjust time resources based on real-time scheduling information. The system transitions from static resource allocation to dynamic adjustment, allowing the base station to optimize communication efficiency while ensuring half-duplex constraint compliance through continuous monitoring and adaptive resource management.
Solution Approach 2:
The feedback mechanism described earlier enables the base station to receive scheduling information from receiving UEs and use this feedback to dynamically adjust resource allocations. This ensures that UEs do not transmit and receive simultaneously, maintaining half-duplex constraint compliance while optimizing communication efficiency through adaptive resource management.
3Device complexity
If the base station is unaware of the intended receiver, then scheduling complexity is reduced, but resource allocation accuracy decreases
Solution Approach 1:
The patent introduces the receiving UE as an intermediary that bridges the gap between the transmitting UE and the base station. The receiving UE sends backside information containing the transmitting UE's identifier and the intended receiver, effectively mediating the information flow. This intermediary approach enables the base station to achieve accurate resource allocation without significantly increasing its own scheduling complexity, as the receiving UE handles the information aggregation and transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may transmit, to a base station, a buffer status report for a first sidelink transmission to a device. The first UE may receive, from a second UE, sidelink control information scheduling the first UE for a time resource for a second sidelink transmission from the second UE, the sidelink control information including an indication of a serving cell identifier of the second UE. The first UE may detect a half-duplex scheduling conflict, or a possible half-duplex scheduling conflict, based on the serving cell identifier and transmit an indication of the conflict to a serving base station. The base station may then assign, or re-assign, resources for the first sidelink transmission to avoid the scheduling conflict.