Base Station COT Allocation for Unlicensed Sidelink Communication
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Solution Overview
Problem
The efficiency of Sidelink communication in unlicensed frequency bands is low due to a lower probability of winning channel contention and longer delays in obtaining Channel Occupancy Time (COT), which affects synchronization and data signal transmission efficiency.
Innovation Solution
A base station device performs channel access processing to obtain COT and allocates it to user equipment for Sidelink communication, while also transmitting synchronization and data signals in a predefined time-frequency resource format, and user equipment receives and utilizes this allocation to reduce delays and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If user equipment performs channel access processing to obtain COT for Sidelink communication in unlicensed frequency band, then the user equipment can transmit Sidelink signals, but the probability of winning channel contention is low and the delay in obtaining COT is long
Solution Approach 1:
The base station acts as an intermediary between multiple user equipments and the unlicensed frequency band channel. Instead of user equipments directly competing for channel access, the base station performs channel access processing to obtain COT first, then allocates this COT to user equipments for Sidelink communication. This intermediary approach increases the probability of obtaining channel access and reduces the delay compared to direct user equipment competition.
2Productivity
If user equipment wins channel contention and obtains COT, then Sidelink transmission can be performed, but the efficiency remains low due to single user service limitation
Solution Approach 1:
The base station is designed to serve multiple user equipments simultaneously by performing channel access processing once and then allocating the obtained COT to multiple users. This universal approach allows the system to support multi-user Sidelink communication, transforming the channel access mechanism from single-user focused to multi-user capable, thereby improving both efficiency and adaptability.
3Productivity
If Sidelink synchronization signal is transmitted efficiently, then synchronization between transmitting UE and receiving UE is improved, but the current transmission efficiency is insufficient
Solution Approach 1:
The base station performs channel access processing and obtains COT before allocating it to user equipments for Sidelink communication. This preliminary action ensures that the channel is secured and ready before user equipments need to transmit synchronization signals and data. By preparing the channel access in advance at the base station level, the transmission efficiency and reliability of synchronization signals are improved.
Data Source
AI summary
Provided are methods for wireless communication, electronic devices, and computer readable storage media, which help to improve the efficiency of sidelink communication in an unlicensed frequency band. For example, provided is an electronic device of a base station side, which may comprise a processing circuit configured to: perform channel access processing on an unlicensed frequency band for sidelink communication, so as to obtain a channel occupancy time (COT); and generate downlink control information, so as to indicate that the COT is allocated to a user device for sidelink communication. Also provided is an electronic device of a user side, which may comprise a processing circuit configured to: receive downlink control information indicating that a channel occupancy time (COT), obtained by a base station side device by performing channel access processing on an unlicensed frequency band used for sidelink communication, is allocated to the electronic device for sidelink communication.