Uplink Data Transmission with Selection Across Overlapping TTI Channels
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Solution Overview
Problem
Existing LTE systems lack a definitive solution for transmitting data on overlapping channels with different Transmission Time Intervals (TTIs), particularly in short-TTI scenarios, which is crucial for meeting higher user-plane delay requirements in future mobile communication systems.
Innovation Solution
A method and apparatus for selecting one uplink channel for transmission and dropping or puncturing the remaining channel when their transmission periods overlap, utilizing a preset method to prioritize and manage Uplink Control Information (UCI) transfer between uplink control and shared channels with different TTI lengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If short-TTI transmission is implemented to reduce user-plane delay, then transmission speed and responsiveness are improved, but channel overlap conflicts between different TTI lengths occur
Solution Approach 1:
The patent changes the TTI length parameter to create short-TTI transmissions (2, 3, 4, or 7 symbols) alongside legacy 1ms TTI transmissions. This parameter variation enables reduced user-plane delay while managing channel overlaps through defined prioritization rules between different TTI lengths
Solution Approach 2:
The system dynamically adjusts transmission behavior based on TTI length conflicts. When short-TTI and legacy TTI channels overlap, the system dynamically selects which channel to transmit based on predefined priorities, allowing flexible adaptation to different transmission scenarios
2Productivity
If both sPUCCH and PUSCH/PUCCH are scheduled in the same sub-frame with different TTI lengths, then channel utilization is improved, but transmission conflict occurs
Solution Approach 1:
The patent introduces different TTI length parameters for control channels (sPUCCH with short TTI) and data channels (PUSCH/PUCCH with legacy 1ms TTI). This parameter differentiation allows simultaneous scheduling while resolving conflicts through defined selection rules based on TTI length and channel type
Solution Approach 2:
The patent segments the uplink transmission into different TTI length categories (short-TTI for control, legacy TTI for data). This segmentation allows independent management of control and data transmissions, resolving conflicts by applying different transmission rules to different segments
Data Source
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AI summary
The present invention discloses a data transmission method and apparatus. The method comprises: determining on a terminal side whether there is an overlap between a transmission time of an uplink channel which transmits using a first transmission time interval length and a transmission time of an uplink channel which transmits using a second transmission time interval length; when there is an overlap, then selecting a part of the uplink channel for transmission according to a predetermined rule, and abandoning the remaining uplink channel for transmission or puncturing the transmission of the remaining uplink channel. On a network side, determining that the terminal selects one type of uplink channel for transmission according to the predetermined rule, and abandons another type of uplink channel for transmission or punctures the transmission of another type of uplink channel. With the present invention, correct transmission of the terminal can be achieved even when channels with different transmission time intervals overlap.