Dynamic Guard Time Control in TDD User Equipment
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Solution Overview
Problem
Current LTE/LTE-Advanced systems lack techniques for dynamically controlling guard time and setting guard subcarriers, which are essential for improving communication quality by reducing interference between uplink and downlink signals in TDD schemes and future radio technologies.
Innovation Solution
The development of user equipment and base station technologies that dynamically control guard time and set guard subcarriers based on report signals, allowing for flexible configuration of subframes and resource blocks to prevent signal interference, including the use of OFDM schemes with mixed bands for TA control and non-control bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If guard time is fixed in conventional LTE/LTE-Advanced systems, then system simplicity is maintained, but communication quality deteriorates due to interference between uplink and downlink signals in dynamic TDD and full-duplex schemes
Solution Approach 1:
The patent implements dynamic guard time control where the base station determines guard time settings based on traffic conditions and subframe configurations, then notifies user equipment through signaling. This allows the guard time to adapt dynamically between different values (first guard time for TA control bands, second guard time for non-TA control bands) rather than being fixed, thereby improving communication quality while managing system complexity through centralized control
Solution Approach 2:
The patent changes the guard time parameter based on different band types and traffic conditions. Specifically, it sets a first guard time for bands performing TA control and a second guard time for bands not performing TA control, allowing the system to optimize communication quality by adjusting this critical timing parameter according to operational requirements
2Reliability
If guard subcarriers are not configured in full-duplex schemes, then frequency resource utilization is maximized, but interference between uplink and downlink control signals increases
Solution Approach 1:
The patent applies local quality by configuring guard subcarriers specifically in resource blocks allocated for control signals in full-duplex schemes, rather than across the entire frequency spectrum. This localized approach places non-communication subcarriers only where interference between uplink and downlink control signals occurs, thereby improving communication quality while minimizing the impact on overall frequency resource utilization
Solution Approach 2:
The patent introduces guard subcarriers as intermediary elements between uplink and downlink control signal subcarriers. These non-communication subcarriers act as buffers that prevent direct interference between the two directions, allowing full-duplex operation while maintaining signal quality through the mediation of these protective frequency resources
3Adaptability or versatility
If dynamic TDD is implemented with flexible uplink/downlink configuration, then traffic adaptability is improved, but timing synchronization becomes more complex due to varying guard time requirements
Solution Approach 1:
The patent implements a feedback mechanism where the base station determines the appropriate guard time based on traffic conditions and subframe configuration, then notifies user equipment through signaling. This feedback loop allows the system to adapt to varying traffic demands dynamically while centralizing the complexity of timing calculations at the base station, which has better visibility into overall system state
Solution Approach 2:
The patent creates a universal timing control mechanism that handles both TA control bands and non-TA control bands through a unified framework. The base station applies different guard time values based on band type, but the overall control structure remains universal and manageable, allowing flexible TDD configuration without proportionally increasing timing control complexity
Data Source
AI summary
User equipment for communicating with a base station in a radio communication system supporting communication based on a TDD scheme, the user equipment including a transmitter that transmits an uplink signal while setting a guard time in the uplink signal based on a report signal indicating a structure for each subframe, the report signal being transmitted from the base station; a receiver that receives a downlink signal from the base station; and an identification unit that identifies, based on the report signal, a position of a guard time that is set in the downlink signal received by the receiver.