Sidelink Data Transmission with Selective LBT Subband Allocation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently transmitting sidelink data over unlicensed frequency bands due to high LBT failure probabilities and interference, particularly when using multiple LBT subbands.
Innovation Solution
A method for determining frequency-domain resources within a transmission band that reduces LBT subband occupancy and minimizes LBT detections by selecting resources within the same LBT subband, using criteria such as sidelink control information and RSRP measurements to optimize resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple LBT subbands are used for sidelink data transmission, then frequency diversity and transmission reliability are improved, but LBT failure probability and interference increase
Solution Approach 1:
The transmission band is divided into multiple LBT subbands, and the patent selects specific subbands for resource allocation based on LBT success probability. By segmenting the frequency band and selectively using subbands with lower LBT failure probability, the system achieves frequency diversity while avoiding the harmful effects of using all subbands uniformly.
Solution Approach 2:
Different LBT subbands are treated differently based on their local characteristics (LBT failure probability). The patent identifies and prioritizes subbands with lower LBT failure probability for resource allocation, applying local quality optimization rather than uniform treatment across all subbands.
2Adaptability or versatility
If multiple LBT subbands are occupied for frequency-domain resource allocation, then resource allocation flexibility is improved, but power consumption increases due to multiple LBT detections
Solution Approach 1:
Instead of performing LBT detections on all M LBT subbands, the patent performs LBT detections on only a subset of subbands (specifically, those with lower failure probability). This partial action approach maintains resource allocation flexibility while reducing power consumption by avoiding unnecessary LBT detections on subbands that are less likely to succeed.
Solution Approach 2:
The patent changes the parameter of LBT subband selection by prioritizing subbands with lower LBT failure probability. This parameter-based selection strategy allows the system to maintain adaptability in resource allocation while reducing the number of LBT detections required, thereby lowering power consumption.
3Object-affected harmful factors
If frequency-domain resources are distributed across multiple LBT subbands, then interference diversity is improved, but LBT detection complexity and failure probability increase
Solution Approach 1:
The patent segments the frequency band into LBT subbands and selectively allocates resources to subbands with lower LBT failure probability. This segmentation approach maintains interference diversity by using multiple subbands while reducing detection complexity by focusing only on promising subbands rather than all subbands.
Solution Approach 2:
The patent performs LBT detections on only a partial set of LBT subbands (those with lower failure probability) rather than all subbands. This partial detection approach reduces LBT detection complexity and failure probability while still achieving interference diversity through selective multi-subband resource allocation.
Data Source
AI summary
The present disclosure is applied to the technical field of wireless communications. Provided are a method and apparatus for transmitting sidelink data, and a readable storage medium. The method comprises: determining the value of N, wherein N is the number of frequency-domain resource units to be determined of a user equipment on a transmission frequency band, the transmission frequency band is located in an unlicensed frequency band, and the transmission frequency band comprises M listen-before-talk (LBT) sub-bands; determining a frequency-domain resource in the transmission frequency band according to a frequency-domain resource position of at least one LBT sub-band, wherein the frequency-domain resource comprises N frequency-domain resource units, and the number of LBT sub-bands occupied by the frequency-domain resource is less than or equal to M; and transmitting sidelink data on the frequency-domain resource. In the present disclosure, when a frequency-domain resource in a transmission frequency band is determined, the influence of the number of occupied LBT sub-bands is taken into consideration, and it can be determined that the frequency domain resource occupies different numbers of LBT sub-bands, so as to meet different sidelink data transmission requirements.