Wireless Burst Access in Unlicensed Spectrum Using Adaptive LBT
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Solution Overview
Problem
Existing channel access schemes in unlicensed frequency spectrum cause severe interference and inefficiencies due to improper handling of transmission bursts and switching times, particularly in scenarios involving base station and terminal device transitions.
Innovation Solution
Determine the channel access scheme for a transmission burst based on the previous burst within the same Channel Occupancy Time (COT), allowing for Cat-1 LBT omission if the gap between bursts is within a threshold, thereby enhancing channel sharing and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional channel access schemes are used for transmission bursts in unlicensed spectrum, then channel access is controlled, but severe interference occurs and transmission efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by determining the channel access scheme for a transmission burst based on the previous burst within the same COT. The base station evaluates whether the time gap between consecutive bursts is less than a threshold, and pre-determines whether Cat-1 LBT should be omitted, thereby proactively managing channel access and reducing interference before the actual transmission occurs.
2Device complexity
If transmission bursts are separated by large time intervals, then channel access is simplified, but channel sharing efficiency decreases and time is lost
Solution Approach 1:
The patent applies dynamics by making the channel access scheme adaptive based on the time gap between transmission bursts. When the gap is small (less than threshold), Cat-1 LBT is used for rapid channel sharing; when the gap is large, Cat-2 LBT is applied for simplified access. This dynamic adjustment optimizes both efficiency and complexity based on actual transmission conditions.
3Speed
If Cat-1 LBT is always applied, then channel access speed increases, but interference to other systems increases
Solution Approach 1:
The patent applies parameter changes by varying the channel access parameters (LBT category) based on the time gap between transmission bursts. The system dynamically switches between Cat-1 LBT (faster, more aggressive) and Cat-2 LBT (slower, more conservative) depending on the specific transmission scenario, thereby optimizing both access speed and interference control.
4Productivity
If transmission bursts are transmitted continuously without LBT, then transmission efficiency increases, but interference to other communications deteriorates
Solution Approach 1:
The patent applies feedback by having the base station evaluate the time gap between transmission bursts and use this information to determine the appropriate LBT category. This feedback mechanism ensures that continuous transmission is enabled only when safe (small time gaps), while LBT is applied when necessary to avoid interfering with other communications, thus balancing efficiency and interference control.
Data Source
AI summary
An embodiment of the present disclosure provides a wireless communication method and apparatus for unlicensed frequency spectrum, and a communication device. The method includes transmitting, by a first device, first information to a second device on a first transmission burst within first Channel Occupancy Time (COT). A channel access scheme corresponding to the first transmission burst is determined based on a second transmission burst. The second transmission burst is a last transmission burst before the first transmission burst within the first COT. The first COT is COT obtained by the first device or COT obtained by the second device.