LTE-U Base Station CCA Check for Power Reduction
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Solution Overview
Problem
In LTE-U systems operating in unlicensed frequency bands, existing scheduling methods waste power and reduce channel utilization efficiency due to continuous transmission of preservation signals without checking the Clear Channel Assessment (CCA) condition, leading to interference with other communication systems.
Innovation Solution
A method where a base station checks the CCA condition and transmits scheduling information through a licensed band channel, minimizing power consumption and optimizing channel occupation by switching to an unlicensed band only when successful, and includes mechanisms for DRX control to manage power usage effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station continuously transmits preservation signals without checking CCA condition, then the channel occupation is maintained, but power consumption increases and interference with other communication systems occurs
Solution Approach 1:
The base station performs periodic CCA checks before transmitting preservation signals and only transmits when the channel is clear. This periodic sensing approach replaces continuous transmission, reducing power consumption while maintaining reliable channel occupation through periodic re-assertion of presence.
Solution Approach 2:
The base station uses CCA feedback from the unlicensed band to dynamically control preservation signal transmission. When CCA indicates the channel is occupied or busy, the base station suppresses preservation signal transmission, thereby reducing power consumption and avoiding interference with other systems while maintaining channel occupation when conditions permit.
2Reliability
If the base station continuously transmits preservation signals without checking CCA condition, then the channel occupation is maintained, but interference with other communication systems increases
Solution Approach 1:
By implementing periodic CCA checks before preservation signal transmission, the base station ensures it only transmits when the channel is clear. This periodic approach prevents continuous interference with other communication systems while maintaining channel occupation through periodic re-assertion.
Solution Approach 2:
The base station performs preliminary CCA assessment before transmitting preservation signals to detect potential interference conditions. When CCA indicates the channel is busy, the base station preemptively avoids transmission, thereby preventing interference with other communication systems before it occurs.
3Productivity
If scheduling information is transmitted through unlicensed band without CCA check, then channel utilization efficiency is maintained, but power waste and interference occur
Solution Approach 1:
The base station implements periodic CCA checks before transmitting scheduling information in the unlicensed band. This ensures transmission only occurs when the channel is clear, maintaining channel utilization efficiency by avoiding unnecessary retransmissions while eliminating power waste from transmitting into occupied channels.
Solution Approach 2:
The base station uses CCA feedback to dynamically control scheduling information transmission. When CCA indicates the channel is clear, transmission proceeds efficiently; when CCA indicates occupancy, transmission is suppressed. This feedback-driven approach optimizes both channel utilization and power efficiency.
Data Source
AI summary
The present disclosures provides a method in a communication system for scheduling, by a base station, a terminal which uses an unlicensed band channel, comprising: a step in which a base station transmits scheduling information with respect to an unlicensed band to a terminal through a licensed band channel in a first subframe; a step in which the base station performs a search for the unlicensed band channel; and a step in which, if the search for the unlicensed band channel is successful, downlink data is transmitted to the terminal through the unlicensed band channel on the basis of the scheduling information.