NTN Scheduling Delay With Gap Offsets for NBIoT Uplinks
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Solution Overview
Problem
In Non-Terrestrial Networks (NTN), the scheduling of uplink transmissions in Narrowband Internet-of-Things (NBIoT) is constrained by misunderstandings of transmission gap positions due to missing control signals, leading to inefficient scheduling and potential loss of synchronization.
Innovation Solution
Introduce a gap time offset (Toffset) indicated in the control signal to schedule uplink data or feedback data, ensuring transmission gaps are correctly positioned without limiting the length of scheduled transmissions, and utilize a semi-static configuration by higher layers to align UE and eNB understanding of transmission gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE monitors NPDCCH continuously to ensure accurate scheduling, then scheduling accuracy is improved, but power consumption increases and monitoring complexity increases
Solution Approach 1:
The patent applies preliminary action by having the UE stop NPDCCH monitoring in advance during the NPUSCH transmission period. The control signal explicitly indicates the transmission period, and the UE proactively terminates monitoring before the scheduled uplink transmission begins, avoiding unnecessary monitoring complexity and power consumption while maintaining scheduling accuracy through the control signal's timing information.
2Use of energy by stationary object
If the UE stops NPDCCH monitoring during uplink transmission, then power consumption is reduced, but misunderstanding of transmission gap positions occurs
Solution Approach 1:
The patent implements feedback by having the control signal explicitly indicate the transmission period and gap time offset information. This feedback mechanism ensures that even though the UE stops monitoring during uplink transmission, the UE and network maintain synchronized understanding of transmission gap positions through the control signal's timing information, preventing misunderstandings about when gaps occur.
Solution Approach 2:
The control signal provides preliminary information about the transmission period and gap time offset before the uplink transmission begins. This allows the UE to accurately determine when transmission gaps will occur without needing to monitor NPDCCH during the transmission period, reducing power consumption while maintaining accurate gap position knowledge through the pre-provided timing information.
3Manufacturing precision
If the scheduling delay is extended to accommodate transmission gaps, then transmission gap positioning is improved, but scheduling flexibility is reduced
Solution Approach 1:
The patent applies dynamics by making the gap time offset adjustable and configurable. The control signal can indicate different gap time offset values, allowing the scheduling delay to be dynamically adjusted based on specific transmission requirements. This dynamic configuration enables precise transmission gap positioning while maintaining scheduling flexibility through configurable offset values.
Solution Approach 2:
The patent changes the parameter of gap time offset to resolve the contradiction. By allowing the gap time offset to be configurable and adjustable in the control signal, the system can achieve precise transmission gap positioning when needed while maintaining scheduling flexibility through parameter adjustment. The gap time offset becomes a variable parameter that can be optimized for different scenarios.
Data Source
AI summary
Methods and apparatuses for NTN scheduling delay enhancement are disclosed. A method comprises receiving a control signal, the control signal schedules an uplink data or schedules a downlink data; and transmitting the uplink data starting from a time slot that is a first time offset after the end of the control signal or transmitting a feedback data corresponding to the downlink data starting from a time slot that is a second time offset after the end of the downlink data.