Sidelink Burst Preamble Detection for Low-Power Unlicensed Spectrum
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems using unlicensed spectrum for sidelink transmissions, UEs face power consumption issues due to unnecessary blind detection of sidelink control information (SCI) when channels are occupied by other wireless technologies or UEs, necessitating a method to identify relevant transmissions without decoding SCI.
Innovation Solution
A UE generates and transmits a predefined sequence at the beginning of a sidelink burst, spanning a predetermined number of consecutive symbols, to enable detection of sidelink transmissions without decoding SCI, using interlace-based resource allocation and LBT procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE performs blind detection of SCI in each slot on unlicensed spectrum, then the UE can identify relevant transmissions, but the power consumption increases significantly
Solution Approach 1:
The patent applies preliminary action by transmitting a sequence at the beginning of the sidelink burst before the actual data transmission. This sequence serves as a preamble that allows receiving UEs to detect the presence of a transmission and determine whether to proceed with SCI decoding, thereby avoiding unnecessary power consumption from blind detection in every slot.
2Use of energy by moving object
If a UE skips SCI detection to save power, then the power consumption decreases, but the UE cannot determine whether the channel is occupied by relevant transmissions
Solution Approach 1:
The patent introduces an intermediary element - a predefined sequence transmitted at the start of the sidelink burst. This sequence acts as a mediator that carries information about channel occupancy and transmission presence without requiring full SCI decoding. The sequence enables UEs to gain channel information indirectly, balancing power savings with information acquisition.
3Reliability
If the sequence is transmitted at every candidate position, then the detection reliability improves, but the overhead and complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the transmission resources into specific candidate positions within slots rather than transmitting at every possible position. The sequence is transmitted only at predefined candidate positions, which segments the search space and reduces complexity while maintaining detection reliability through strategic positioning.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and apparatuses for detecting a sidelink transmission burst over an unlicensed spectrum. According to an embodiment of the present disclosure, a method performed by a user equipment (UE) for wireless communication includes: generating a sequence; and transmitting the sequence at a beginning of a sidelink burst on a carrier, starting from a first candidate position of a set of candidate positions in a first slot, wherein the sequence spans a predetermined number of consecutive symbols in time domain and the sidelink burst is contiguously transmitted in time domain without any gap.