TDD Scheduling Using UE-Specific DL-UL Gap Requirements
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Solution Overview
Problem
Existing scheduling algorithms in TDD systems do not consider the downlink-to-uplink gap requirements, leading to wasted resources and reduced overall throughput.
Innovation Solution
A scheduler that takes into account UE-specific downlink-to-uplink gap requirements by using path delay or timing advance to determine optimal scheduling decisions, ensuring that transmission resources are assigned to meet these gap requirements, thereby minimizing gaps and maximizing throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed downlink-to-uplink gap is configured for all UEs based on cell range, then timing synchronization is maintained, but transmission resources are wasted and overall throughput decreases
Solution Approach 1:
The patent applies local quality by configuring UE-specific downlink-to-uplink gaps based on individual UE path delays rather than using a uniform cell-range-based gap. Each UE receives a customized gap configuration that matches its specific propagation delay characteristics, thereby eliminating unnecessary gaps for UEs with shorter path delays while maintaining required timing synchronization for all UEs.
Solution Approach 2:
The patent implements dynamics by making the downlink-to-uplink gap configurable and adaptable to individual UE conditions. The RAN can dynamically adjust the gap duration for each UE based on reported path delay measurements, transforming the static fixed gap into a flexible, condition-based parameter that optimizes resource utilization while maintaining synchronization.
2Ease of operation
If existing scheduling algorithms are used without considering TDD gap requirements, then scheduling simplicity is maintained, but transmission resources are wasted in gap periods
Solution Approach 1:
The patent applies preliminary action by having the RAN configure UE-specific downlink-to-uplink gap parameters before scheduling decisions are made. The UE reports its path delay characteristics in advance, and the RAN pre-calculates appropriate gap configurations, allowing the scheduler to efficiently allocate resources without wasting time in gap periods while maintaining relatively simple scheduling operations.
3Device complexity
If a uniform gap configuration is used for all UEs, then configuration complexity is minimized, but cell throughput is reduced due to excessive gaps
Solution Approach 1:
The patent applies local quality by implementing UE-specific gap configurations tailored to individual path delay characteristics. Instead of applying a uniform conservative gap to all UEs, each UE receives a customized gap value that matches its specific propagation delay, eliminating excessive gaps for nearby UEs while maintaining adequate gaps for distant UEs, thereby optimizing cell throughput without excessive configuration complexity.
Solution Approach 2:
The patent implements parameter changes by adjusting the downlink-to-uplink gap parameter individually for each UE based on measured path delay values. The RAN modifies this timing parameter dynamically according to UE-specific conditions, transforming the fixed uniform gap into an adaptive parameter that optimizes throughput while managing configuration complexity through automated path delay measurement and calculation.
Data Source
AI summary
Systems and methods for scheduling downlink and/or uplink transmissions to wireless communication devices in a Time Division Duplexing (TDD) system that take into account downlink-to-uplink gap requirements of the wireless communication devices are disclosed. In one embodiment, a method performed by a network node for scheduling downlink and/or uplink transmissions to a plurality of wireless communication devices in a TDD system comprises obtaining path delay requirements (e.g., timing advance requirements) of a plurality of wireless communication devices, determining downlink-to-uplink gap requirements of the plurality of wireless communication devices based on the path delay requirements of the plurality of wireless communication devices, and performing scheduling for the plurality of wireless communication devices based on the downlink-to-uplink gap requirements of the plurality of wireless communication devices.