V2X Resource Status Reporting via Segmented Bitmaps
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Solution Overview
Problem
In V2X communication, the centralized scheduling resource pool often results in large amounts of data for reporting resource use statuses, leading to severe reporting overheads and potential transmission collisions due to the need for terminal devices to interact extensively with network devices for resource allocation.
Innovation Solution
A method where terminal devices divide resources into smaller to-be-measured resources based on a measurement parameter, determine their use status, and report this information using bitmaps to reduce overheads and prevent collisions by allowing network devices to allocate unoccupied resources effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If terminal devices report use statuses of all resources in the centralized scheduling resource pool, then the network device can accurately allocate unoccupied resources, but the uplink message size becomes very large causing severe reporting overheads
Solution Approach 1:
The resource pool is divided into multiple resource sets, where each resource set contains a subset of resources. The terminal device separately reports use statuses of resources within each resource set, rather than reporting all resources in one large message. This segmentation reduces the size of each uplink message while ensuring complete coverage of all resource statuses for accurate network device allocation decisions.
2Reliability
If the centralized scheduling transmission mode is used, then resource allocation is controlled by the network device, but the transmission delay increases due to frequent interactions between terminal devices and network devices
Solution Approach 1:
The network device pre-configures multiple resource sets and their corresponding parameters before the terminal device needs to transmit data. This preliminary configuration allows the terminal device to quickly determine resource availability and select appropriate resources without needing to interact with the network device at the moment of transmission, thereby reducing transmission delay while maintaining network-controlled allocation reliability.
3Speed
If the distributed transmission mode is used, then transmission delay is reduced, but transmission collisions occur when different terminal devices select the same resource
Solution Approach 1:
The terminal device in distributed transmission mode obtains use status information of resources in each resource set from the network device. This feedback mechanism provides the terminal device with knowledge of which resources are currently occupied, enabling it to select unoccupied resources and avoid collisions. The resource set structure organizes this feedback information efficiently, maintaining transmission speed while improving reliability through collision avoidance.
Data Source
AI summary
Embodiments of this application provide a resource use status reporting method and a communications apparatus. A terminal device divides a resource in a first resource set into a plurality of to-be-measured resources based on a first measurement parameter used to indicate a length of the to-be-measured resource, determines a use status of each to-be-measured resource to obtain use status information, and then reports the use status information to a network device.