Ultra-Compact DCI Scheduling PDSCHs for NTN Downlink Coverage
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Solution Overview
Problem
Wireless communication systems in non-terrestrial networks face challenges due to increased propagation delays and power flux density limitations, leading to reduced downlink coverage and potential bottlenecks in PDCCH transmissions, which affect network throughput and data transmission reliability.
Innovation Solution
The use of ultra compact DCI and scheduling PDSCHs to simplify DCI structure, reduce payload size, and distribute scheduling information across multiple PDSCHs, along with PUCCH for HARQ-ACK signaling, to enhance data transmission reliability and coverage in NTN environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional DCI structure is used in NTN, then complete scheduling information can be transmitted, but PDCCH transmission becomes a bottleneck reducing network throughput
Solution Approach 1:
The patent segments the scheduling information transmission by introducing intermediate scheduling PDSCHs that carry partial scheduling information, allowing the DCI to be delivered in multiple parts rather than requiring a single complex PDCCH transmission. This reduces PDCCH bottleneck effects and improves network throughput in NTN environments.
2Object-affected harmful factors
If power flux density limitations are applied in NTN, then regulatory compliance is achieved, but downlink coverage is reduced
Solution Approach 1:
The patent divides the downlink transmission into multiple segments including intermediate scheduling PDSCHs and data PDSCHs. This segmentation allows the system to comply with power flux density limitations while maintaining coverage through multiple transmission opportunities, as each segment can be optimized independently for power distribution.
Solution Approach 2:
The patent employs preliminary scheduling actions where intermediate scheduling PDSCHs are transmitted before the actual data PDSCH. This preliminary action provides advance scheduling information to the UE, allowing the system to maintain coverage area while adhering to power flux density constraints by spreading transmissions over time.
3Speed
If propagation delays are reduced in NTN, then transmission speed improves, but coverage area shrinks
Solution Approach 1:
The patent uses preliminary scheduling PDSCHs to provide advance notification to UEs about upcoming data transmissions. This preliminary action allows the system to maintain larger coverage areas by giving UEs early warning of transmissions, enabling them to prepare for reception even when propagation delays are minimized for speed improvement.
Data Source
AI summary
System and methods for using ultra compact downlink control information (DCI) in conjunction with one or more scheduling physical downlink shared channels (PDSCHs) are disclosed herein. A base station may transmit, to a user equipment (UE), an ultra compact DCI that schedules the one or more scheduling PDSCHs. The one or more scheduling PDSCHs may schedule a data PDSCH or physical uplink shared channel (PUSCH) that is to be used for user/application layer data transmission. The ultra compact DCI and/or the one or more scheduling PDSCHs may be as configured by a system information block (SIB). The ultra compact DCI and/or the one or more scheduling PDSCHs may schedule a physical uplink control channel (PUCCH) used for hybrid automatic repeat request acknowledgement (HARQ-ACK) signaling relative to the one or more scheduling PDSCHs. Aspects regarding the use of these systems and methods in non-terrestrial network (NTN) contexts are considered.