LTE–NR Sidelink Resource Mapping to Reduce Collisions
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies face challenges in enabling efficient co-channel co-existence of LTE and NR sidelink (SL) operations, leading to overlapping transmissions and collisions within a device, necessitating methods for LTE and NR spectrum sharing and maximum deployment flexibility.
Innovation Solution
A wireless transmit/receive unit (WTRU) is configured to receive configuration information for LTE and NR SL resource pools, determine associations between their time and frequency resources, exclude overlapping resources, and select NR SL resources based on priority, thereby facilitating hybrid automatic repeat request (HARQ)-enabled NR SL transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE and NR SL transmissions are allowed to overlap in co-channel deployment, then spectrum sharing flexibility is improved, but transmission collisions and interference increase
Solution Approach 1:
The patent applies preliminary action by having the WTRU determine the association between LTE and NR time-frequency resources in advance, and pre-exclude overlapping resources before actual transmission occurs. The WTRU determines which NR SL resources overlap with LTE SL resources and excludes these from the set of available NR SL resources, preventing collisions before they happen.
Solution Approach 2:
The patent extracts the harmful overlapping resources from the available NR SL resource pool. By identifying and removing the subset of NR SL resources that overlap with LTE SL resources, the system maintains flexibility in resource selection while eliminating the source of interference and collisions.
2Reliability
If NR SL resources overlapping with LTE SL resources are excluded, then transmission collisions are reduced, but available NR SL resources decrease
Solution Approach 1:
The patent applies local quality by making differentiated resource availability decisions based on the specific characteristics of each NR SL resource. Instead of uniformly restricting all resources, the system allows NR SL transmissions on resources that do not overlap with LTE, while excluding only the specific overlapping resources, thus maintaining optimal resource utilization where possible.
3Measurement precision
If the WTRU determines association between LTE and NR time-frequency resources, then resource exclusion accuracy is improved, but processing complexity increases
Solution Approach 1:
The patent segments the resource association determination into manageable components by dividing the time-frequency resources into discrete units (subframes for LTE and slots for NR) and establishing associations between these segmented units. This segmentation makes the complex association determination process more systematic and implementable.
Data Source
AI summary
A WTRU may be configured to receive configuration information regarding a LTE sidelink (SL) resource pool and a NR SL resource pool. The WTRU may be configured to determine an association between time and frequency resources of the LTE SL resource pool and time and frequency resources of the NR SL resource pool. The WTRU may be configured to select NR SL candidate resources, from the NR SL resource pool. for a hybrid automatic repeat request (HARQ)-enabled NR SL transmission. The WTRU may be configured to receive reservation information indicating LTE time and frequency resources of the LTE SL resource pool. The WTRU may be configured to determine a NR SL physical SL feedback channel (PSFCH) resource corresponding to each NR SL candidate resource of the selected NR SL candidate resources. The WTRU may be configured to exclude a NR SL candidate resource from the selected NR SL candidate resources.