Sidelink Resource Pool Collision Avoidance in Relay UE Communication
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Solution Overview
Problem
In Device-To-Device (D2D) communication, existing methods fail to effectively avoid collisions between sidelink (SL) transmission and reception, and uplink (UL) transmission in mobile communication networks, particularly when a relay UE is not controlled by an eNB, leading to inefficiencies in resource allocation and increased power consumption.
Innovation Solution
The method involves determining a resources pool for SL communication that includes both transmission and reception resources, and transmitting this information to a relay UE, along with an indication of a second resources pair or confirmation, to prevent collisions by prioritizing SL communication over UL communication when necessary, allowing the relay UE to select and manage resources for collision-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If resource allocation is not controlled by eNB in D2D communication, then device autonomy and flexibility are improved, but collision probability between SL transmission/reception and UL transmission increases
Solution Approach 1:
The patent applies preliminary action by having the relay UE select and report a candidate resource pair to the eNB before actual SL communication occurs. The eNB then provides advance indication or confirmation of the approved resource pair, allowing the relay UE to prepare for collision-free transmission in advance rather than resolving collisions reactively
Solution Approach 2:
The patent implements feedback mechanisms where the relay UE reports assistant information including candidate resource pairs to the eNB, and the eNB responds with indications or confirmations. This closed-loop feedback enables the network to guide resource selection while maintaining device autonomy, resolving the contradiction between flexibility and collision avoidance
2Productivity
If resource pool includes both SL transmission and reception resources, then resource allocation efficiency is improved, but collision risk between simultaneous transmission and reception increases
Solution Approach 1:
The patent applies local quality by providing different resource pool configurations to different relay UEs based on their specific communication scenarios. The eNB can indicate different resource pairs or provide confirmations tailored to each relay UE's local conditions, allowing efficient resource utilization while avoiding collisions through customized local resource allocation
Solution Approach 2:
The patent segments the resource pool into specific resource pairs (tx resource, rx resource) and provides granular control by indicating or confirming specific pairs rather than allowing unrestricted access to the entire pool. This segmentation enables efficient resource usage while preventing simultaneous transmission-reception collisions through precise resource pairing
3Loss of energy
If relay UE autonomously selects resources from resource pool, then signaling overhead is reduced, but resource allocation precision and collision avoidance capability deteriorate
Solution Approach 1:
The patent applies partial action by having the relay UE perform limited autonomous selection of candidate resource pairs from the pool, then reporting only the selected candidate to the eNB. This partial autonomy reduces signaling overhead compared to full network control, while the eNB's subsequent indication or confirmation provides just enough additional precision to ensure collision avoidance
Data Source
AI summary
Apparatuses and methods are disclosed for sidelink (SL) communication. One method of apparatus includes determining a first resources pool for SL communication which includes SL transmission resources and SL reception resources, and transmitting resources information to a relay UE. Wherein, the first resources pool is a SL subframes pool or a SL SPS configurations pool, and the resources information is the first resource pool or a resource pair selected by the apparatus for SL communications.