Sidelink Resource Pool Configuration via Bitmap Exclusion
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Solution Overview
Problem
In wireless communication systems, especially for V2X scenarios, there is a need for efficient methods to determine and configure sidelink (SL) resource pools, as existing technologies face challenges in accurately representing TDD UL-DL patterns due to limitations in PSBCH payload size and accessible SCS information, leading to inefficient SL communication.
Innovation Solution
A method where a UE receives a TDD UL-DL configuration from a base station, including information about SL symbols, and uses a bitmap to determine the SL resource pool by excluding slots not configured for UL resources, S-SSB, and reserved slots, thereby optimizing the SL resource pool configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a bitmap is used to represent SL resource pool slots, then the UE can efficiently determine available SL resources, but the PSBCH payload size becomes insufficient to carry the complete TDD UL-DL configuration information
Solution Approach 1:
The TDD UL-DL configuration information is segmented into two parts: (1) a subset of slot configuration information transmitted via PSBCH using a compact bitmap representation, and (2) complete configuration information provided through other signaling mechanisms. This segmentation allows the PSBCH to carry essential SL resource pool determination data while avoiding payload size constraints
Solution Approach 2:
The patent introduces an intermediary approach where the PSBCH carries a simplified bitmap representation of SL resource pool slots, which serves as a reference for UE to determine available SL resources. The complete TDD configuration acts as an intermediary that provides additional context when needed, bridging the gap between limited PSBCH capacity and comprehensive configuration requirements
2Productivity
If all slots are included in the SL resource pool, then the SL communication capacity is maximized, but interference from non-UL slots and S-SSB transmissions increases
Solution Approach 1:
The patent extracts and excludes specific slots from the SL resource pool that are not suitable for SL communication, namely non-UL slots and slots containing S-SSB transmissions. This extraction process creates a refined SL resource pool containing only slots that are both available for UL communication and free from interfering transmissions, thereby maximizing SL communication capacity while minimizing interference
Solution Approach 2:
Instead of starting with all slots and adding restrictions, the approach inverts the logic by defining the SL resource pool through exclusion criteria. The bitmap representation explicitly indicates which slots to exclude (non-UL slots and S-SSB slots), transforming the problem from positive inclusion to negative exclusion, which simplifies interference management
Data Source
AI summary
A method for a first device to perform wireless communication and a device supporting same. The method may include the steps of: receiving, from a base station, a time division duplex uplink-downlink (TDD UL-DL) configuration including information related to a UL resource; receiving, from the base station, information related to the start of sidelink (SL) symbols, information related to the number of the SL symbols, and a bitmap indicating one or more slots included in an SL resource pool; and determining the SL resource pool.