Uplink Control Information Transmission in Multi-Cell LTE Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE communication systems, efficiently transmitting and receiving uplink control information across multiple serving cells, particularly between a terminal apparatus and a base station apparatus, is hindered by the complexity of scheduling and processing time intervals, especially when using both PUSCH and sPUSCH channels.
Innovation Solution
The solution involves a terminal apparatus and a base station apparatus configured to receive and transmit uplink control information using both PUSCH and sPUSCH channels, with specific configurations for primary and secondary cells, allowing for efficient scheduling and processing by prioritizing PUSCH transmission in secondary cells during certain subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uplink control information is transmitted using both PUSCH and sPUSCH channels across multiple serving cells, then the reliability and coverage of control information transmission is improved, but the scheduling complexity and processing time increases
Solution Approach 1:
The patent segments the uplink control information transmission by dividing serving cells into primary cells and secondary cells. Each cell type has dedicated transmission channels (PUSCH for primary, sPUSCH for secondary), which segments the overall transmission system into manageable parts with distinct functions, reducing scheduling complexity while maintaining reliability across multiple cells.
Solution Approach 2:
The patent implements dynamic selection of transmission channels based on the type of serving cell. The terminal apparatus dynamically determines whether to use PUSCH or sPUSCH based on whether the cell is a primary or secondary cell, allowing the system to adapt its transmission strategy to the specific cell type and current transmission requirements.
2Reliability
If uplink control information is transmitted using both PUSCH and sPUSCH channels across multiple serving cells, then the redundancy and robustness of transmission is improved, but the processing time and latency increases
Solution Approach 1:
By segmenting transmission channels according to cell type, the patent enables parallel processing of control information across primary and secondary cells. Each cell type has its own dedicated channel (PUSCH or sPUSCH), allowing simultaneous transmission without interference, thus maintaining robustness while reducing overall processing time.
Solution Approach 2:
The patent establishes predetermined rules for channel selection based on cell type before transmission occurs. The terminal apparatus is pre-configured to know which channel (PUSCH or sPUSCH) to use for each cell type, eliminating the need for real-time decision-making during transmission and reducing processing latency.
3Productivity
If PUSCH transmission is performed in primary cell and sPUSCH transmission is performed in secondary cell simultaneously, then the resource utilization efficiency is improved, but the coordination complexity between cells increases
Solution Approach 1:
The patent applies local quality by assigning different transmission channel characteristics to different cell types. Primary cells use PUSCH with specific properties, while secondary cells use sPUSCH with different properties. This local differentiation optimizes resource utilization for each cell type while the clear distinction between them reduces coordination complexity.
Solution Approach 2:
The patent creates a universal framework where the primary/secondary cell distinction universally determines channel selection across all serving cells. This multi-functional approach allows the same rule set to apply regardless of the specific cell configuration, enabling efficient resource utilization while maintaining consistent coordination procedures.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Uplink control information can be efficiently transmitted. A terminal apparatus (1): (i) receives an uplink grant used for scheduling of a PUSCH and an uplink grant used for scheduling of a sPUSCH; (ii) transmits uplink control information; and (iii) in a first case of performing sPUSCH transmission in a first subframe in the primary cell and performing PUSCH transmission in the first subframe in the secondary cell, transmits the uplink control information by using the PUSCH in the first subframe in the secondary cell.