Unlicensed Sidelink Symbol Transmission for Slot Resource Utilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In sidelink communication on unlicensed frequency bands, channel resources are excessively wasted, leading to low spectrum resource utilization.
Innovation Solution
A wireless communication method where a terminal device sends a first signal on unoccupied symbols of a slot, including symbols copied from a next slot, a to-be-sent transport block, or a cyclic prefix extension, to effectively occupy channel resources in unlicensed spectrums.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT mechanism is used for channel access in unlicensed spectrum, then channel access fairness is improved, but channel resource utilization deteriorates due to excessive backoff and idle time
Solution Approach 1:
The transmitting terminal performs LBT in advance before the slot boundary and determines the remaining symbols available for transmission. By proactively assessing channel availability and preparing transmission content (copying symbols from next slot or using CPE) before the actual transmission window opens, the system reduces idle time and ensures immediate channel utilization when access is granted.
Solution Approach 2:
The patent dynamically adjusts the transmission strategy based on the number of remaining symbols in the slot. When N is small, symbols are copied from the next slot; when N is large, CPE is used or original transmission proceeds. This dynamic adaptation optimizes resource utilization while maintaining fair channel access under varying channel conditions.
2Reliability
If complete slot transmission is used, then transmission reliability is improved, but channel resource waste increases when channel access is delayed
Solution Approach 1:
The transmitting terminal copies symbols from the next slot to the current slot when the remaining symbol count N is insufficient for complete TB transmission. This copying mechanism ensures that transmission can proceed with available resources rather than waiting for a complete slot, reducing channel resource waste while maintaining acceptable transmission reliability through redundancy.
Solution Approach 2:
The patent changes the transmission parameters dynamically based on the remaining symbol count N. When N < threshold, the system switches to copying mode; when N >= threshold, it uses CPE or original transmission. This parameter adaptation allows the system to balance reliability and resource efficiency based on real-time channel access conditions.
3Ease of operation
If channel access is performed at slot boundary, then synchronization is simplified, but channel resource utilization deteriorates due to fixed timing constraints
Solution Approach 1:
The patent segments the transmission opportunity into two parts: the remaining symbols N of the current slot and the subsequent slots. By allowing transmission to start at the slot boundary but flexibly utilizing only the available N symbols plus additional resources (copying or CPE), the system maintains synchronization simplicity while improving resource utilization through fine-grained time resource management.
Data Source
AI summary
This application provides a wireless communication method and apparatus. The method includes: determining N first symbols in a first slot, where N is a positive real number greater than 1 and less than M, M is a quantity of symbols included in the first slot, M is a positive integer, a frequency domain resource corresponding to the first slot is an unlicensed spectrum, and the first symbols are unoccupied symbols in the first slot; and sending a first signal to a terminal device on the N first symbols. The first signal includes at least one of the following: a symbol copied from a second slot, a to-be-sent first transport block, or a cyclic prefix extension. The second slot is a next slot of the first slot. According to the disclosure, a channel resource in an unlicensed spectrum can be effectively occupied, thereby reducing waste of channel resources.