Terminal Device Uplink Control Information Transmission Delay Reduction
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Solution Overview
Problem
In LTE-A systems, the fixed 1 ms transmission time interval for uplink and downlink data leads to increased information transmission delay when carrier aggregation is used, especially when different component carriers have varying transmission lengths, making it challenging to efficiently transmit uplink control information.
Innovation Solution
The method involves grouping downlink component carriers based on their transmission lengths and scheduling them to ensure aligned transmission lengths, allowing for the use of either time division multiplexing (TDM) or frequency division multiplexing (FDM) to transmit uplink control information, thereby reducing transmission delay by optimizing the use of available channel capacities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed 1 ms transmission time interval is used for all component carriers, then system simplicity is maintained, but information transmission delay increases when component carriers have different transmission lengths
Solution Approach 1:
The patent segments component carriers into different groups based on their transmission time interval lengths. Specifically, it divides component carriers into those with sTTI (short TTI) and those with normal TTI (1 ms), and applies different scheduling and multiplexing strategies to each group. This segmentation allows the system to handle carriers with different transmission lengths efficiently without forcing all carriers to use a fixed 1 ms interval, thereby reducing information transmission delay while maintaining manageable system complexity through structured organization.
2Adaptability or versatility
If component carriers with different transmission lengths are aggregated, then carrier aggregation capability is enhanced, but uplink control information transmission efficiency deteriorates due to delay
Solution Approach 1:
The patent introduces a grouping mechanism as an intermediary layer between component carriers with different transmission lengths and the uplink control information transmission process. By grouping carriers with the same TTI length together and applying specific multiplexing rules (TDM for sTTI carriers, FDM for normal TTI carriers), the system mediates the interaction between heterogeneous carriers, enabling efficient UCI transmission without requiring all carriers to synchronize to a fixed 1 ms interval, thus maintaining both aggregation capability and transmission efficiency.
3Ease of operation
If uplink control information is transmitted using 1 ms TTI for all carriers, then scheduling simplicity is maintained, but transmission delay increases for carriers with sTTI
Solution Approach 1:
The patent implements dynamic scheduling strategies that adapt to the transmission time interval characteristics of different component carrier groups. For sTTI carriers, the system dynamically allocates uplink control information transmission resources using time division multiplexing within the sTTI framework, allowing transmission delays to match the shorter carrier intervals. For normal TTI carriers, frequency division multiplexing is used. This dynamic adaptation enables the scheduling system to optimize for each carrier type's characteristics rather than imposing a static 1 ms interval on all carriers, reducing transmission delay while maintaining reasonable scheduling complexity through rule-based differentiation.
Data Source
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AI summary
An information processing method and a terminal device are disclosed. The method is applied to a terminal device and includes: grouping DL component carriers CCs based on a downlink DL transmission length; and sending UCI based on grouped DL CCs by using an uplink UL CC, where the UCI is UCI corresponding to the grouped DL CCs, and transmission lengths of DL CCs in at least one DL CC group of the grouped DL CCs are all the same. According to embodiments of the present invention, an information transmission delay can be reduced.