User Equipment Shortened TTI Scheduling Method
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Solution Overview
Problem
Existing technologies for shortening Transmission Time Interval (TTI) in radio communication systems, such as LTE, face challenges in being adaptive to various User Equipment (UE) and result in high system overhead.
Innovation Solution
A data transmission method where User Equipment (UE) acquires configuration information for a shortened TTI from a base station, blindly detects a physical downlink control channel, and determines secondary DCI based on primary DCI to schedule data transmission in a second shortened TTI, allowing flexible scheduling and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If TTI is shortened to reduce air interface delay, then air interface delay is reduced, but control overhead increases
Solution Approach 1:
The control channel is segmented into two types: primary DCI for initial access and secondary DCI for scheduled transmissions. This segmentation allows the system to reduce control overhead by using compact secondary DCI formats for repeated transmissions while maintaining the necessary primary DCI for initial connection establishment.
Solution Approach 2:
The patent implements periodic blind detection at the UE side where the device periodically monitors for DCI messages during the shortened TTI period. This periodic action pattern allows efficient resource utilization while reducing overall control overhead compared to continuous monitoring in longer TTI structures.
2Adaptability or versatility
If blind detection is performed frequently to support shortened TTI, then scheduling flexibility is improved, but device complexity increases
Solution Approach 1:
The patent implements a dynamic switching mechanism where the UE can transition between blind detection mode and scheduled mode based on received DCI messages. This dynamics principle allows the system to maintain high scheduling flexibility when needed while reducing device complexity by entering a more passive scheduled state when resources are pre-allocated.
Solution Approach 2:
The base station performs preliminary scheduling actions by sending primary DCI messages that pre-allocate resources for subsequent transmissions. This preliminary action reduces the need for frequent blind detection, thereby lowering device complexity while maintaining scheduling flexibility through the pre-established resource allocations.
3Quantity of substance
If system overhead is reduced for shortened TTI, then resource efficiency is improved, but adaptability to various UE types deteriorates
Solution Approach 1:
The patent designs the DCI structure with universal components that can serve multiple UE types. The primary DCI format and secondary DCI format are designed to be universally applicable across different UE categories, allowing the system to reduce overhead while maintaining adaptability through a unified yet flexible control channel design.
Solution Approach 2:
The patent enables parameter changes in the DCI messages to adapt to different UE types while maintaining a compact structure. By allowing flexible parameter configuration within the standardized DCI framework, the system can reduce overall system overhead while still accommodating various UE capabilities and requirements through parameter adjustments rather than structural changes.
Data Source
AI summary
A UE and a data transmission method thereof are provided. The method includes: acquiring configuration information of a first shortened TTI sent by a base station; blindly detecting a predetermined physical downlink link control channel with a period of the first shortened TTI, until primary DCI corresponding to the UE is acquired; determining secondary DCI corresponding to the UE based on the acquired primary DCI; and performing data transmission with the base station in a second shortened TTI scheduled by the secondary DCI. Flexibility of application of a shortened TTI may be improved, and resources may be saved.