Unlicensed Carrier Channel Access Optimization
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Solution Overview
Problem
In licensed-assisted access using Long Term Evolution (LAA-LTE) systems, unlicensed eNBs face a high probability of unsuccessful channel access due to random timing in preempting channels, leading to inefficient data throughput in wireless communications networks.
Innovation Solution
A data transmission method where a first device obtains and shares status information about its data transmission using an unlicensed carrier with a second device, allowing the second device to adjust its parameters for channel preemption, specifically through an extended clear channel assessment (ECCA) process, thereby optimizing channel access timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If unlicensed eNBs preempt channels at random time using LBT principle, then channel access is performed, but the probability of successful channel access is low
Solution Approach 1:
The patent applies preliminary action by having the first unlicensed eNB perform channel preemption and obtain channel status information (such as channel occupancy duration, interference level, or clear channel assessment results) before the second unlicensed eNB attempts channel access. This advance information allows the second eNB to adjust its ECCA parameters proactively, selecting an appropriate backoff counter value based on the reported status, thereby increasing the probability of successful channel access and reducing access time.
2Productivity
If unlicensed eNBs use LBT channel access manner, then channel preemption is performed, but data throughput is reduced due to unsuccessful access
Solution Approach 1:
The patent implements feedback by having the first unlicensed eNB report channel status information to the second unlicensed eNB after performing channel preemption. The second eNB uses this feedback information to adjust its ECCA parameters and make informed channel access decisions. This feedback mechanism enables the system to adapt to channel conditions dynamically, improving both the success rate of channel access and overall data throughput by reducing failed access attempts.
Data Source
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AI summary
Embodiments of the present invention provide a data transmission method, a device, and a system, and relate to the communications field, so as to increase a probability of accessing a channel. The method includes: obtaining, by a first device, status information of sending data by the first device by using an unlicensed carrier; and sending, by the first device to a second device, the status information of sending the data, so that the second device adjusts, according to the status information, a parameter used when the second device preempts the unlicensed carrier. The method is used for data transmission.