Flexible Time-Domain Data Transmission for Ultralow Latency
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Solution Overview
Problem
Current mobile communication technologies, such as LTE, face challenges in achieving ultralow data transmission delays required for applications like 3D targets, virtual reality, and intelligent transportation, due to fixed time-domain lengths and subframe structures that hinder rapid data transmission.
Innovation Solution
A data transmission method that configures a time-domain length based on time-domain symbols, allowing for flexible data transmission and enabling multiple transmission opportunities within a subframe, thereby reducing delays and improving resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the PDCCH/ePDCCH receiving is delayed, then data decoding on PDSCH will be delayed, but maintaining the fixed subframe structure preserves system compatibility
Solution Approach 1:
The patent segments the subframe structure by introducing multiple starting positions for PDSCH within a subframe, allowing data transmission to begin at different time points rather than waiting for the fixed subframe boundary. This segmentation enables faster data transmission by eliminating the mandatory wait for subframe synchronization while maintaining compatibility with existing LTE frame structures.
Solution Approach 2:
The patent implements dynamic scheduling by allowing the PDSCH to start at multiple configurable positions within a subframe based on when the PDCCH/ePDCCH is received. This dynamic approach contrasts with the fixed subframe-based scheduling, enabling the system to adapt transmission timing to actual channel conditions and control channel reception timing, thereby reducing delay while maintaining system compatibility.
2Ease of operation
If the time-domain length is fixed to occupy the entire subframe, then frequency-domain position can be adjusted, but data transmission delay increases for small data packets
Solution Approach 1:
The patent segments the time-domain resources by introducing multiple PDSCH starting positions within a subframe. This allows the data transmission to be confined to only the necessary time duration rather than occupying the entire subframe. For small data packets, transmission can complete in fewer symbols, reducing delay while frequency-domain resource allocation remains flexible through existing mechanisms.
Solution Approach 2:
The patent changes the time-domain parameter by introducing multiple configurable starting positions for PDSCH within a subframe. This parameter change enables the system to adjust transmission duration dynamically based on data size and channel conditions, reducing delay for small packets while maintaining frequency-domain allocation flexibility through established LTE resource block mechanisms.
3Reliability
If data transmission waits for the next subframe, then processing can be performed, but data transmission delay increases
Solution Approach 1:
The patent applies preliminary action by configuring multiple PDSCH starting positions in advance within each subframe. This allows the system to prepare multiple transmission opportunities beforehand, so when data needs to be transmitted, the UE can immediately use the next available starting position without waiting for subframe boundaries. Processing reliability is maintained through pre-configured resource allocation while delay is reduced by eliminating the mandatory subframe wait.
Solution Approach 2:
The patent implements dynamic timing by allowing PDSCH to start at multiple configurable positions within a subframe rather than requiring alignment with subframe boundaries. This dynamic approach enables processing to complete as soon as control channel reception allows, improving reliability through proper processing timing while reducing delay by not forcing waits for subframe synchronization.
Data Source
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AI summary
Disclosed are a data transmission method and apparatus. The method includes: a transmission node acquiring information about a data transmission mode, herein the information about the data transmission mode includes a rapid data transmission mode in which a time-domain length of data transmission is configured based on a time-domain symbol; and the transmission node transmitting data according to the acquired data transmission mode. In the data transmission method, the time-domain length of data transmission is configured based on the time-domain symbol, the setting of the time-domain length of data transmission is flexible, multiple opportunities of data transmission can exist in one subframe, resources used for data transmission can be guaranteed to be found rapidly when there is a data transmission demand, thus rapid data transmission is realized and data transmission delay is reduced.