Sidelink Interlaced Resource Allocation for Unlicensed Band Interference
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Solution Overview
Problem
Sidelink communication in an unlicensed frequency band faces severe interference due to multiple devices sending signals on the same time-frequency resource, as devices monitor and occupy a channel bandwidth less than a specific proportion, leading to mutual interference.
Innovation Solution
The sidelink communication method involves sending a sidelink signal occupying an interleaved resource with a specific interval in the frequency domain, ensuring the frequency domain bandwidth is not less than a certain proportion of the channel bandwidth, and multiplexing PSCCH and PSSCH through time division within a slot to prevent devices from channel monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If devices send sidelink signals on the same time-frequency resource to improve spectral efficiency, then transmission delay is reduced, but mutual interference increases
Solution Approach 1:
The frequency domain bandwidth is divided into multiple interleaved resources, where each resource consists of non-contiguous PRBs distributed across the bandwidth. This segmentation prevents devices from occupying the entire bandwidth, allowing other devices to perform channel monitoring and select different resources, thereby reducing mutual interference while maintaining efficient resource utilization
Solution Approach 2:
The patent transitions from contiguous frequency resource allocation to non-contiguous interleaved resource allocation. By distributing PRBs across the frequency domain with specific intervals, the system creates a new resource dimension that allows multiple devices to coexist without severe interference, while still occupying sufficient bandwidth for efficient transmission
2Device complexity
If devices occupy less than a specific proportion of channel bandwidth to simplify resource allocation, then device complexity is reduced, but channel monitoring effectiveness deteriorates
Solution Approach 1:
The patent introduces a specific parameter - the proportion of channel bandwidth that must be occupied (not less than a specific proportion). This parameter change ensures that devices occupy sufficient bandwidth to effectively block channel monitoring, preventing resource conflicts while maintaining manageable allocation complexity through standardized resource patterns
Data Source
AI summary
The present application relates to a sidelink communication method and a terminal device. The sidelink communication method comprises: a sidelink signal sent by a sending end TX occupying interlace resources, wherein one interlace resource comprises a plurality of physical resource blocks (PRBs) with specific intervals on a frequency domain; and a frequency domain bandwidth occupied by one interlace resource is not less than a specific proportion of a channel bandwidth. A sidelink signal sent in the embodiments of the present application occupies the interlace resources, such that the sidelink signal sent by the sending end occupies a certain channel bandwidth on the frequency domain to prevent devices, which work on the same unlicensed frequency band, from performing channel listening on the current time-frequency resource, thereby preventing a plurality of devices from sending sidelink signals on the same time-frequency resource, and reducing the interference of sidelink communication.