Sidelink Positioning Resource Reservation Method
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Solution Overview
Problem
Sidelink positioning reference signals (SL PRS) resources may overlap with resources used for sidelink communication, leading to collisions between SL PRS transmissions and sidelink signals from other terminal devices.
Innovation Solution
A communication method where a first terminal device sends indication information to a second terminal device to reserve an SL PRS resource, ensuring that the reserved resource does not overlap with the second terminal device's sidelink communication resources, either by matching time domain units, selecting non-overlapping resources, or overlapping resources that do not conflict with the second terminal device's usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a first terminal device reserves an SL PRS resource for sending an SL PRS, then positioning reference signal transmission is enabled, but the SL PRS resource may collide with a sidelink signal sent by another terminal device
Solution Approach 1:
The first terminal device sends indication information in advance to reserve the SL PRS resource before actual transmission. This preliminary reservation allows the second terminal device to adjust its sidelink communication resources accordingly, preventing collision before it occurs. The indication information includes time domain unit matching and resource pool configuration that enables proactive resource coordination.
Solution Approach 2:
The second terminal device receives the indication information and provides feedback by adjusting its sidelink communication resource selection. The second device determines whether to send sidelink signals in specific time domain units based on the received indication, creating a feedback loop that resolves resource conflicts. This feedback mechanism ensures that resource allocation decisions are coordinated between both terminal devices.
2Adaptability or versatility
If SL PRS resources are reserved without coordination, then positioning functionality is achieved, but communication efficiency deteriorates due to collisions
Solution Approach 1:
The resource allocation system becomes dynamic through the indication information exchange. The first terminal device can dynamically reserve SL PRS resources in specific time domain units, and the second terminal device dynamically adjusts its sidelink communication accordingly. This dynamic coordination allows the system to adapt resource allocation in real-time, maintaining both positioning capability and communication efficiency without fixed rigid allocations.
3Ease of operation
If the first SL PRS resource is located in the same time domain unit as the indication information, then resource reservation is simplified, but the resource may still overlap with sidelink communication resources
Solution Approach 1:
The indication information acts as an intermediary mechanism between resource reservation and collision avoidance. By sending indication information that includes time domain unit matching criteria, the first terminal device creates a coordination layer that simplifies reservation while preventing overlap. The second terminal device uses this intermediary information to adjust its resource selection, resolving the contradiction between simplicity and conflict avoidance.
Data Source
AI summary
Provided are a communication method and a terminal device. The method includes: sending, by a first terminal device, first indication information to a second terminal device, where the first indication information is used to indicate reserving a first SL PRS resource in an SL PRS resource pool, and the first SL PRS resource satisfies one of the following: a time domain unit in which the first SL PRS resource is located is the same as a time domain unit in which the first indication information is located; the first SL PRS resource is an SL PRS resource other than a resource used for sidelink communication in the SL PRS resource pool; or a second SL PRS resource included in the first SL PRS resource overlaps a resource that is used by the second terminal device for sidelink communication in a sidelink communication resource pool.