V2X Resource Pool Determination Using Repeated Bitmaps
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Solution Overview
Problem
There is a need for a detailed method to determine a time-domain resource pool for Vehicle-to-X (V2X) communication that efficiently transmits control information and data while avoiding collisions with other transmissions.
Innovation Solution
A method involving a bitmap repeated integer-multiple times within a predetermined period is used to determine a subframe pool for V2X communication, excluding sidelink synchronization signal resources and uplink subframes, and selecting subframes based on the bitmap repetitions to establish a resource pool for sidelink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a detailed method is provided for determining the time-domain resource pool for V2X communication, then resource allocation efficiency is improved, but the complexity of resource pool configuration increases
Solution Approach 1:
The resource pool configuration is segmented into multiple bitmaps, where each bitmap corresponds to a specific subframe set. This segmentation allows for granular control over resource allocation while maintaining manageable configuration complexity through modular bitmap structures.
Solution Approach 2:
The bitmaps are pre-configured to indicate available subframes for V2X transmission before actual communication occurs. This preliminary configuration enables UEs to autonomously determine resource pools without real-time coordination, improving allocation efficiency while reducing operational complexity.
2Productivity
If subframes are selected based on bitmap repetitions to establish a resource pool, then transmission efficiency is improved, but the difficulty of detecting and measuring resource availability increases
Solution Approach 1:
The bitmap pattern is repeated across multiple subframe sets, creating a predictable copy structure. This repetition allows receiving UEs to detect resource availability by examining a single bitmap pattern and inferring its applications across repeated sets, reducing detection difficulty while maintaining high transmission efficiency.
3Reliability
If control information and data are transmitted using the determined resource pool, then communication reliability is improved, but the loss of time for resource determination increases
Solution Approach 1:
The resource pool is determined in advance through pre-configured bitmaps before actual V2X transmission occurs. This preliminary resource determination eliminates real-time resource allocation delays, ensuring both high communication reliability and minimal time loss.
Data Source
AI summary
A method includes receiving, at a mobile device, resource pool configuration information, the resource pool configuration information comprising a bitmap to determine the resource pool and determining, for a period having a plurality of consecutive subframes, a first subset of subframes by excluding, from the plurality of consecutive subframes, subframes in which a sidelink synchronization signal (SLSS) resource is configured and subframes other than uplink subframes. The method also includes determining, for the period, a second subset of subframes by excluding, from the first subset of subframes, one or more subframes, wherein a quantity of the second subset of subframes corresponds to an integer multiple of a length of the bitmap, and determining, based on a plurality of repetitions of the bitmap, the resource pool for a sidelink transmission from the second subset of subframes.