Over-the-Air Dynamic TDD with Uplink-Multiplexed Channel Use Indicators
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Solution Overview
Problem
Existing wireless communication systems face interference issues due to uncoordinated access to shared radio frequency spectrum, leading to increased signaling overhead and latency, particularly in dynamic time division duplex (TDD) operations.
Innovation Solution
Implementing a dynamic TDD operation with channel use indicators multiplexed in uplink transmissions to manage UE-to-UE interference, eliminating the need for dedicated clear-to-send bursts and reducing overhead by integrating channel use indicators with scheduled uplink regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated clear-to-send bursts are used for channel usage indication, then interference management between UEs is achieved, but signaling overhead and latency increase
Solution Approach 1:
The patent combines the channel usage indication function with existing uplink transmission resources. Instead of using separate dedicated clear-to-send bursts, the channel use indicator is multiplexed with scheduled uplink regions, merging two functions into a single transmission resource, thereby reducing signaling overhead and latency while maintaining interference management capability
Solution Approach 2:
The uplink transmission resources are designed to serve multiple purposes: they carry both data transmissions and channel use indicators simultaneously. This multi-functionality eliminates the need for dedicated resources solely for channel indication, reducing overall signaling overhead while maintaining the ability to manage UE-to-UE interference effectively
2Productivity
If dynamic TDD operations are implemented in shared spectrum, then network capacity and flexibility are improved, but UE-to-UE interference increases
Solution Approach 1:
The patent implements a feedback mechanism where UEs transmit channel use indicators in uplink regions to inform other UEs about their transmission status. This feedback allows receiving UEs to adjust their operations and avoid causing or suffering from interference, enabling dynamic TDD to operate effectively in shared spectrum while managing UE-to-UE interference
Solution Approach 2:
The channel use indicators are transmitted in advance within scheduled uplink regions before potential interference scenarios occur. This preliminary indication allows other UEs to prepare appropriate interference mitigation actions, enabling dynamic TDD operations to maintain high network capacity while preventing harmful interference through proactive coordination
Data Source
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AI summary
Over-the-air (OTA) dynamic time division duplex (TDD) is disclosed with a channel use indicator (CUI) receiver (CUI-R) signal multiplexed in uplink transmissions. According to various aspects, a user equipment (UE) may receive a downlink grant from a serving base station, in which the downlink grant identifies downlink transmissions in one or more subsequent communication slots. The UE may identify a trigger for transmission of a channel usage signal associated with the grant that may be received by neighboring UEs that may potentially interfere. The UE transmits the channel usage signal in a next scheduled uplink region and then receives downlink data from the serving base station according to the downlink grant. If the neighboring UE receives a conditional uplink grant, then it may proceed with uplink transmissions when it fails to detect the channel usage signal from the UE.