Subframe Scheduling for Uplink Data Transmission
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Solution Overview
Problem
In telecommunication networks, especially those using 3GPP specifications, the uncertainty of channel availability leads to inefficiencies in subframe scheduling, resulting in increased signaling overhead and data transmission delays due to the need for re-scheduling when scheduled subframes are found to be busy, particularly in scenarios like unlicensed operations.
Innovation Solution
The network device schedules a larger number of subframes than needed for uplink data transmission, allowing the terminal device to select a subset of available subframes, thereby increasing the probability of successful data transmission and reducing unnecessary signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the network device schedules a plurality of subframes in one UL grant based on the buffer status report, then the signaling overhead is reduced, but the data transmission delay increases when some scheduled subframes are found to be busy due to uncertain channel availability
Solution Approach 1:
The network device schedules a larger number of subframes than the terminal device actually needs for uplink data transmission. The terminal device is allowed to select a subset of the scheduled subframes for transmitting its buffered data. This excessive scheduling approach ensures that even if some subframes are unavailable due to LBT failures or channel uncertainties, the terminal device can still find enough available subframes to transmit all its data within the same UL grant, avoiding additional signaling overhead from re-scheduling requests.
2Productivity
If the network device schedules exactly the number of subframes matching the buffer status report, then the resource allocation efficiency is improved, but the reliability of data transmission decreases when channel availability is uncertain
Solution Approach 1:
The network device provides a cushion of additional subframes beyond what the terminal device immediately needs. By scheduling more subframes than the minimum required, the system creates a buffer against uncertainties in channel availability. This beforehand cushioning ensures that even if some subframes become unavailable due to LBT failures or external interference, the terminal device still has enough remaining subframes to complete its data transmission without requiring re-scheduling.
3Reliability
If the network device schedules a larger number of subframes than needed, then the reliability of data transmission is improved under uncertain channel availability, but the resource allocation efficiency decreases
Solution Approach 1:
The terminal device is empowered to autonomously select which subframes to use for transmitting its buffered data from the set of scheduled subframes. This self-service approach allows the terminal device to choose only the subframes it actually needs and can use, avoiding waste of scheduled resources. The terminal device can skip subframes that are unavailable or not needed, and use only the necessary number of subframes, thereby improving overall resource allocation efficiency while maintaining the reliability benefits of over-scheduling.
Data Source
AI summary
Embodiments of the present disclosure relate to methods and devices for subframe scheduling. In example embodiments, according to a method implemented in a network device is provided, a report indicating a size of uplink data to be transmitted by the terminal device is received from a terminal device. Scheduling grant information is transmitted to the terminal device indicating a first number of subframes scheduled to the terminal device for transmission of the uplink data. The first number of subframes are determined based on the report, and the first number is greater than a second number of subframes to be consumed by the transmission of the uplink data.