Unlicensed Carrier Transmission Scheduling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, the use of unlicensed bands for signal transmission leads to throughput decreases due to listen before talk (LBT) mechanisms, which require clear channel assessment (CCA) operations, causing suspension of transmissions and interference with other base stations.
Innovation Solution
A base station process that detects signals from other base stations on unlicensed component carriers and determines non-overlapping time intervals for its own signal transmission, avoiding collisions and mitigating interference by selecting different time intervals for transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT mechanism is implemented for unlicensed band transmission, then coexistence with other users is ensured, but throughput decreases due to CCA operation suspensions
Solution Approach 1:
The base station performs CCA operation in advance before transmission to determine channel availability. By preparing the transmission timing and channel assessment beforehand, the system ensures proper coexistence while minimizing transmission suspensions and maximizing throughput opportunities.
2Object-affected harmful factors
If CCA operation is performed to ensure proper channel access, then interference with other base stations is reduced, but transmission time is lost during suspension intervals
Solution Approach 1:
The base station dynamically adjusts transmission timing based on real-time channel conditions detected during CCA operations. When the channel is found to be busy, the base station flexibly schedules transmissions in non-overlapping time intervals, optimizing both interference avoidance and time utilization.
Solution Approach 2:
The invention resolves the time loss problem by utilizing time-domain multiplexing - transmitting signals in different time intervals rather than simultaneously. This dimensional approach to channel access allows multiple base stations to share the unlicensed spectrum efficiently without continuous interruptions.
3Reliability
If transmission is suspended for CCA operation, then channel collision is avoided, but data transmission opportunities are reduced
Solution Approach 1:
The base station maintains continuous channel monitoring and transmission scheduling operations. By keeping the CCA mechanism active and ready, the system ensures that transmission opportunities are captured as soon as the channel becomes available, minimizing gaps in data transmission while maintaining collision avoidance.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A communication device for handling a signal transmission on an unlicensed component carrier (CC) comprises a storage unit for storing instructions and a processing means coupled to the storage unit. The processing means is configured to execute the instructions stored in the storage unit. The instructions comprise detecting at least one first signal transmitted by at least one base station on an unlicensed CC; determining at least one first time interval where the at least one first signal is transmitted by the at least one base station; and transmitting at least one second signal on the unlicensed CC in at least one second time interval to a communication device wherein the at least one second time interval is not overlapped with the at least one first time interval.