Flexible Frame Structure for Half-Duplex Wireless Scheduling
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Solution Overview
Problem
Current wireless communication protocols, such as Half Duplex Frequency Division Duplex (HD-FDD), face challenges in efficiently scheduling uplink and downlink traffic for half-duplex users, leading to inefficiencies due to simultaneous scheduling and inadequate switch time between transmission and reception modes, particularly in group-based frame structures.
Innovation Solution
The proposed solution involves dynamically configuring frame structures with temporal non-overlapping regions and adjustable temporal gaps to allow half-duplex users sufficient switch time, using flexible grouping strategies and signaling mechanisms to optimize resource allocation and air-time utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a group-based frame structure is used to simplify traffic scheduling, then scheduling complexity is reduced, but air-time utilization efficiency deteriorates due to simultaneous uplink and downlink traffic scheduling
Solution Approach 1:
The frame structure is segmented into multiple non-overlapping regions, with each region dedicated to specific user groups. This segmentation allows different groups to be served in different time regions, preventing simultaneous uplink and downlink scheduling conflicts while maintaining organized traffic management.
Solution Approach 2:
The frame structure is made dynamic by allowing flexible configuration of temporal regions and gaps. The system can adaptively adjust the duration and positioning of downlink and uplink regions based on traffic demands, optimizing air-time utilization while preventing scheduling conflicts.
2Productivity
If traffic scheduling is optimized for full-duplex users, then system capacity is improved, but half-duplex user communication reliability deteriorates due to simultaneous transmission and reception requirements
Solution Approach 1:
Different quality of service is provided to different user types through local configuration of frame regions. Half-duplex users are assigned to specific non-overlapping temporal regions with guaranteed protection from simultaneous opposite-direction traffic, while full-duplex users can utilize overlapping regions, ensuring each user type receives appropriate service quality.
Solution Approach 2:
The frame structure is divided into separate temporal regions for different user groups, with half-duplex users assigned to non-overlapping regions. This segmentation isolates half-duplex user traffic from potential conflicts, ensuring reliable communication while maintaining high system capacity through efficient resource allocation.
3Productivity
If temporal gaps are reduced to maximize air-time utilization, then productivity is improved, but switch time adequacy for half-duplex users deteriorates
Solution Approach 1:
The temporal gap duration is made dynamic and configurable based on system conditions. The gap can be adjusted to provide adequate switch time for half-duplex users when needed, while being minimized to maximize air-time utilization when traffic patterns allow, optimizing both user reliability and system efficiency.
Solution Approach 2:
The system changes the temporal parameters of frame structure dynamically, adjusting gap durations and region positions based on traffic demands and user requirements. This allows optimization of air-time utilization while ensuring adequate switch time is provided when half-duplex users require mode transitions.
Data Source
AI summary
A wireless communication base station is disclosed, configured to serve a plurality of user terminals in a series of downlink radio frames wherein user terminals in a first group are served in a first temporal region of the downlink radio frame and user terminals in a second group are served in the second temporal region of the downlink radio frame. A downlink radio frame contains an indicator signaling a change of duration of either of the first or second temporal region of at least one downlink radio frame in a series of downlink radio frames.