Millimeter Wave Subframe Scheduling for 5G RTT Reduction
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Solution Overview
Problem
Current LTE/LTE-Advanced systems, dominated by FDD mode, face extended hand-shaking procedures and round trip time (RTT) issues in TDD mode, which hinder achieving the ambitious RTT requirement of future 5G technology due to conventional FDD-optimized subframe structure.
Innovation Solution
A method for scheduling subframes in a millimeter wave system, involving transmitting downlink and uplink scheduling signaling to indicate specific subframe positions for data transmission, HARQ-A/N, and retransmissions, with predetermined or periodically determined positions to optimize subframe structure for TDD mode, reducing RTT and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If FDD-optimized subframe structure is used in TDD mode, then system compatibility and ease of operation are improved, but round trip time (RTT) is extended and cannot meet 5G requirements
Solution Approach 1:
The patent implements dynamic subframe scheduling where the base station can flexibly configure uplink and downlink subframe positions based on traffic conditions and RTT requirements. The scheduling signaling includes time domain resource allocation information that dynamically assigns resources, allowing the system to adapt TDD subframe structure for shorter RTT while maintaining FDD compatibility where needed.
Solution Approach 2:
The patent changes key parameters of the subframe structure including the position of uplink/downlink subframes, the timing of scheduling signaling, and the allocation of time domain resources. By adjusting these parameters, the system achieves optimized RTT performance in TDD mode while preserving compatibility with existing FDD-based protocols and procedures.
2Adaptability or versatility
If TDD mode is adopted for 5G, then unpaired spectrum utilization and cost-effectiveness are improved, but hand-shaking procedure duration is extended due to FDD-optimized structure
Solution Approach 1:
The patent applies preliminary action by having the base station pre-configure and notify UE of uplink subframe positions and scheduling timing through higher-layer signaling. This allows UE to prepare uplink transmissions in advance, reducing hand-shaking delays. The scheduling signaling includes predetermined time domain resource allocation that enables UE to anticipate and prepare for upcoming transmissions, thereby shortening overall procedure duration while maintaining TDD spectrum efficiency.
3Device complexity
If conventional FDD-optimized subframe structure is used, then device complexity is reduced, but system scalability and flexibility for 5G requirements are limited
Solution Approach 1:
The patent segments the radio frame into configurable uplink and downlink subframes with independent scheduling control. Each subframe can be independently configured and scheduled, allowing flexible adaptation to different 5G scenarios while keeping individual subframe processing relatively simple. The scheduling signaling is segmented to include specific time domain resource allocation for each transmission, enabling scalable system design that can accommodate varying complexity requirements.
Data Source
AI summary
The present disclosure provides a method for scheduling a subframe for transmitting data in a base station of a millimeter wave system, comprising: for scheduling a downlink subframe: transmitting a downlink scheduling signaling (DL grant) in a first subframe, wherein the downlink scheduling signaling includes at least one first scheduling position information, the first scheduling position information indicating a subframe position scheduled for performing downlink transmission; for scheduling an uplink subframe: transmitting an uplink scheduling signaling (UL grant) in a second subframe, wherein the uplink scheduling signaling includes at least one second scheduling position information, the second scheduling position information indicating a subframe position scheduled for performing uplink transmission. The present disclosure also provides a method for scheduling a subframe for transmitting HARQ-A/N in a millimeter wave system.