Multi-TTI Scheduling via Consecutive Slot Intervals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication technologies, the existing methods for scheduling Physical Downlink Shared Channels (PDSCHs) and Physical Uplink Shared Channels (PUSCHs) face challenges with excessive blind detection overhead due to large sub-carrier spaces and short slot durations, particularly in Multi Transmission Time Interval (multi-TTI) designs, where reducing the number of Downlink Control Information (DCI) is necessary to simplify blind detection for User Equipment (UE).
Innovation Solution
A method is introduced to determine a transmission parameter by configuring a set of consecutive integer elements representing slot intervals for Hybrid Automatic Repeat reQuest Acknowledgements (HARQ-ACK) feedback, allowing for efficient HARQ-ACK feedback across multiple PDSCHs scheduled by a single DCI, using a Type1 HARQ-ACK codebook with a fixed or dynamically indicated interval value to ensure all scheduled PDSCHs receive ACK/NACK feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one separate DCI is used to schedule each PDSCH, then scheduling flexibility is ensured, but DCI blind detection overhead becomes excessive when sub-carrier space is large and slot duration is short
Solution Approach 1:
The patent merges multiple PDSCH scheduling operations into a single DCI message by introducing a multi-TTI scheduling mechanism. The DCI includes a time domain resource assignment field that can indicate multiple slot offsets (K0 values), allowing one DCI to schedule multiple PDSCHs across different slots. This combining approach maintains scheduling flexibility while significantly reducing the number of DCI messages the UE must blindly detect.
Solution Approach 2:
The patent enhances the universality of the DCI structure by making the time domain resource assignment field multi-functional. The same field can indicate either a single slot offset for traditional scheduling or multiple slot offsets for multi-TTI scheduling. This multi-functionality allows the system to adapt between scheduling modes without requiring separate DCI formats, thereby reducing blind detection overhead while preserving scheduling flexibility.
2Adaptability or versatility
If the number of PDSCHs scheduled by one DCI is dynamically indicated, then scheduling adaptability is improved, but the complexity of determining HARQ-ACK feedback slots increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring a set of allowed slot offsets (K0 values) through higher layer signaling before actual scheduling occurs. When multi-TTI scheduling is activated, the DCI dynamically indicates which pre-configured K0 values to use by providing a count and starting position. This preliminary configuration simplifies the UE's task of determining HARQ-ACK feedback slots, as the UE only needs to interpret the dynamic indication against the pre-known set of valid offsets rather than calculating all possibilities.
Solution Approach 2:
The patent introduces dynamics by allowing the time domain resource assignment field to flexibly indicate different numbers of PDSCHs based on scheduling needs. The DCI can specify a variable count of scheduled PDSCHs and their corresponding slot offsets dynamically.配合 pre-configured K0 sets, this dynamic indication mechanism allows the system to adapt to varying scheduling requirements while keeping the HARQ-ACK determination process manageable through the pre-established offset values.
3Productivity
If HARQ-ACK feedback for multiple PDSCHs is transmitted on the same PUCCH, then uplink resource efficiency is improved, but the accuracy of timing alignment becomes more critical and difficult to maintain
Solution Approach 1:
The patent applies local quality by calculating and applying individual timing offsets for each PDSCH within the multi-TTI schedule. Instead of using a single timing reference for all PDSCHs, the system determines the PDSCH reception time for each scheduled PDSCH based on its specific slot offset from the DCI. The HARQ-ACK transmission timing is then aligned to the latest PDSCH reception time, ensuring that each PDSCH's feedback is properly timed while still being transmitted together on the same PUCCH, thus maintaining both efficiency and timing accuracy.
Data Source
AI summary
A method for determining a transmission parameter, a method for sending an HARQ-ACK, an apparatus, a device, and a storage medium, applied to the technical field of wireless communications, are provided. The method for determining a transmission parameter includes: determining a first set, the first set including a plurality of consecutive integer elements, where the integer elements indicate a timeslot interval between a PDSCH and a channel for feeding back an HARQ-ACK of the PDSCH.