Terminal Feedback Transmission via Dynamic Time Domain Allocation
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Solution Overview
Problem
In 5G NR systems, the shortening of SPS periods in Rel-16 to support URLLC transmission leads to a situation where some SPS PDSCHs do not have available PUCCH resources, making one-to-one configuration between SPS PDSCH and PUCCH impossible.
Innovation Solution
The solution involves determining a first time domain unit based on the time domain unit occupied by a downlink channel and time offset information, and then determining a second time domain unit after the first one for transmitting feedback information. This allows the feedback information to be accurately transmitted even when there is no one-to-one configuration of downlink and uplink channel resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the SPS period is shortened to support URLLC transmission, then the transmission latency is reduced, but some SPS PDSCHs will not have available PUCCH resources
Solution Approach 1:
The patent segments the feedback transmission process into two independent stages: first determining a first time domain unit based on time offset information, then determining a second time domain unit after the first one for actual feedback transmission. This segmentation allows flexible resource allocation independent of traditional one-to-one SPS-PUCCH configuration, enabling feedback transmission even when SPS period is shortened to 2 symbols.
2Device complexity
If one-to-one configuration between SPS PDSCH and PUCCH is maintained, then feedback transmission is simplified, but it cannot accommodate shortened SPS periods
Solution Approach 1:
The patent introduces dynamic determination of time domain units based on time offset information rather than static one-to-one configuration. The first time domain unit is dynamically determined according to the downlink channel's time domain unit and time offset, allowing the system to adapt to varying SPS periods while maintaining feedback transmission capability.
3Productivity
If the SPS period is reduced to 2 symbols, then URLLC performance is improved, but traditional PUCCH resource allocation becomes insufficient
Solution Approach 1:
The patent transitions from traditional one-to-one spatial mapping between SPS PDSCH and PUCCH resources to a time-domain based allocation mechanism. By determining time domain units sequentially (first time domain unit then second time domain unit), the system allocates resources in the time dimension rather than being constrained by fixed spatial configuration, thereby creating sufficient PUCCH resources even for 2-symbol SPS periods.
Data Source
AI summary
The present application discloses an information sending method and receiving method, an apparatus, a device, and a storage medium. The method comprises: receiving, by a terminal, a first downlink channel; determining, by the terminal, a first time domain unit according to a time domain unit occupied by the first downlink channel and time offset information; determining, by the terminal, a second time domain unit, where the second time domain unit is after the first time domain unit; and transmitting, by the terminal, feedback information corresponding to the first downlink channel on the second time domain unit. An embodiment of the present application provides a new means of sending feedback information, such that when there is no one-to-one configuration between downlink channel and uplink channel resources, it is still possible to ensure that feedback information can be accurately transmitted between a terminal and a base station.