Unlicensed Spectrum COT Sharing for Uplink Downlink Transmission
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Solution Overview
Problem
Existing communication technologies face challenges in efficiently utilizing unlicensed spectra due to regulatory requirements such as the Listen-Before-Talk principle, which limits the sharing of Channel Occupancy Time (COT) between terminals and network devices.
Innovation Solution
A method and apparatus for transmitting data on an unlicensed spectrum, where a terminal acquires COT that includes a first and second time domain resource. The terminal sends target uplink transmission using the first time domain resource, and the network device determines if the second time domain resource can be used for target downlink transmission based on the reception result of the uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a terminal performs LBT and obtains COT for data transmission on unlicensed spectrum, then the terminal can transmit data successfully, but the network device cannot share the COT for downlink transmission
Solution Approach 1:
The COT acquired by the terminal is segmented into multiple transmission opportunities, where the first transmission opportunity is allocated to the terminal for uplink transmission and the second transmission opportunity is allocated to the network device for downlink transmission. This segmentation enables both terminal and network device to utilize the COT effectively, resolving the contradiction between terminal transmission success and network device sharing capability.
2Productivity
If the terminal uses the entire COT for uplink transmission, then the terminal maximizes its transmission opportunities, but the network device loses access to the unlicensed spectrum
Solution Approach 1:
The allocation of transmission opportunities within COT is made dynamic and flexible. The terminal and network device can negotiate and adjust the distribution of transmission opportunities based on current channel conditions and transmission needs. This dynamic allocation allows the terminal to maximize its transmission opportunities while simultaneously enabling the network device to access the unlicensed spectrum for downlink transmissions.
3Productivity
If the unlicensed spectrum is shared among multiple devices, then spectrum utilization improves, but channel access conflicts increase
Solution Approach 1:
The terminal performs LBT and acquires COT in advance before initiating data transmission. This preliminary action establishes the terminal's channel access rights, creating a predetermined transmission window that reduces channel access conflicts. Other devices can anticipate this reserved period and adjust their channel access strategies accordingly, improving overall spectrum utilization while maintaining channel access stability.
Data Source
AI summary
Provided are a method and apparatus for data transmission on an unlicensed spectrum, a device, and a storage medium, relating to the technical field of communications. The method comprises: acquiring a channel occupancy time (COT); and sending a target uplink transmission to a network device by means of a first time domain resource in the COT, wherein a second time domain resource in the COT can be used by the network device to send a target downlink transmission, and the second time domain resource is located after the first time domain resource on a time domain. In this way, there is a higher probability of a network device accessing an unlicensed spectrum under the condition of ensuring the fair sharing of resources on the unlicensed spectrum.