Inter-UE Coordination With Dynamic Sidelink Resource Windows
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Solution Overview
Problem
Existing wireless communication networks face challenges in efficiently coordinating resource allocation between user equipment (UEs) for effective sidelink communication, particularly in scenarios where explicit requests for inter-UE coordination (IUC) are absent or delayed, leading to suboptimal resource utilization and potential interference.
Innovation Solution
A method for UE-A to generate and transmit IUC information by determining resource selection windows based on processing times and explicit or implicit requests, allowing for efficient resource identification and prioritization for IUC information transmission, even in the absence of explicit coordination requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs wait for explicit requests before transmitting IUC information, then network coordination is improved, but resource allocation efficiency deteriorates due to delays
Solution Approach 1:
The UE performs resource selection and prepares IUC information in advance within a resource selection window (RSW) before an explicit request is received. The UE determines candidate resources and selects appropriate resources proactively, so that when the explicit request arrives, the IUC information can be transmitted immediately without delay, thus resolving the contradiction between reliable coordination and time loss.
2Productivity
If UEs transmit IUC information immediately upon having data ready, then resource utilization efficiency is improved, but interference increases due to uncoordinated transmissions
Solution Approach 1:
The UE monitors for explicit requests from other UEs and uses this feedback to determine when to transmit IUC information. The transmission is coordinated based on received requests, ensuring that IUC information is transmitted at appropriate times when the receiving UE is ready, thus improving resource utilization while avoiding uncoordinated interference.
Solution Approach 2:
The UE performs preliminary resource selection within a defined resource selection window before transmission is actually needed. By pre-selecting resources and preparing IUC information in advance within the RSW boundaries, the UE can transmit efficiently when requested without causing interference, as the resource selection already accounts for coordination requirements.
3Reliability
If UEs define resource selection windows based on processing times, then transmission reliability is improved, but resource allocation flexibility deteriorates
Solution Approach 1:
The resource selection window is defined dynamically based on the UE's processing time capability. The starting slot of the RSW is determined by subtracting the processing time from the explicit request reception time, and the window length adapts to the UE's ability to process and prepare IUC information. This dynamic adjustment maintains reliability by ensuring the UE has sufficient processing time while preserving flexibility by adapting to different UE capabilities and conditions.
Data Source
AI summary
Disclosed are methods, systems, and computer-readable medium for effective inter-UE coordination (IUC) scheme. One method, performed by UE-A, includes the UE-A receiving explicit request for IUC from a UE-B, the explicit request indicating a starting slot of a first resource selection window (RSW1) for IUC information, generating IUC information with a plurality of resources sets, wherein the first resource of the plurality of resources is at slot S, determining whether there is a sidelink grant within a second resource selection window (RSW2) having a starting slot (X1) determined based on (i) the starting slot of RSW1 and (ii) UE-A processing time (T″1) and an end slot (X2) determined based on S, based on a determination that there is not an available sidelink grant, triggering resource selection within RSW2 defined by X1 and X2, and using resources within RSW2 defined by X1 and X2 to identify resources for IUC information transmission.