Sidelink Resource Reservation Indication for Collision Avoidance
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Solution Overview
Problem
In wireless communication systems, particularly in sidelink communications, there is a challenge in properly indicating reserved resources, leading to improper preemption of sidelink resources by user equipment (UEs), which can result in performance limitations due to resource collisions and incorrect prioritization.
Innovation Solution
A method and apparatus for wireless communication that allow a UE to transmit and receive indications about reserved sidelink resources, ensuring that a UE is notified when a resource is already reserved by another transmitter UE, thereby preventing improper preemption by using sidelink control information and spare resources from the resource pool to convey conflict indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE transmits a reservation for a sidelink resource without checking if the resource is already reserved, then the UE can attempt to reserve resources freely, but this leads to resource collisions and improper preemption
Solution Approach 1:
The patent implements a feedback mechanism where a receiving UE sends a reserved resource indication to other UEs, informing them of already reserved sidelink resources. This feedback loop prevents resource collisions by allowing UEs to adjust their reservation decisions based on real-time information about resource availability, thus resolving the contradiction between free reservation attempts and collision avoidance.
Solution Approach 2:
The system performs preliminary resource reservation indication before actual resource allocation. By notifying UEs in advance about reserved resources through control information, the system prevents subsequent collision issues and ensures accurate resource allocation, balancing the need for efficient reservation with reliable resource management.
2Productivity
If a UE does not receive information about existing resource reservations, then resource allocation decisions can be made quickly, but this causes improper preemption and communication performance degradation
Solution Approach 1:
The patent establishes a feedback mechanism where receiving UEs transmit reserved resource indications to other UEs in the sidelink communication. This ensures that all UEs are informed about resource reservation status, preventing information loss and enabling proper preemption decisions while maintaining communication efficiency through structured information exchange.
3Device complexity
If the system uses existing sidelink control information for resource reservation indications, then additional signaling overhead is minimized, but the indication mechanism becomes more complex
Solution Approach 1:
The patent makes the sidelink control information multi-functional by using it both for resource reservation indications and for conveying reserved resource status. This universal approach allows the same control information structure to serve multiple purposes - indicating resource availability while also providing conflict detection capabilities - thus avoiding additional signaling overhead while maintaining operational simplicity.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may transmit a reservation for a sidelink resource for a communication by the UE, wherein the sidelink resource was previously reserved by a transmitter UE for a communication by the transmitter UE; and receive an indication that the sidelink resource is reserved and that the UE is not permitted to reserve the sidelink resource. Numerous other aspects are provided.