Uplink Control Channel Carrier Selection in LTE-A
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Solution Overview
Problem
In multicarrier aggregation systems, existing communication methods are not suitable for using multiple carriers, and there is a need for a method that minimizes the impact on legacy systems while enabling efficient uplink/downlink signal transmission/reception.
Innovation Solution
Configuring a primary cell and one or more secondary cells for uplink control channel transmission, allowing the user equipment to dynamically select the most suitable serving cell for transmitting and receiving uplink control channels, and enabling the base station to indicate and receive these channels on specific secondary cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single carrier communication method is used, then the system is simple and legacy compatibility is maintained, but the bandwidth is limited and cannot meet wideband communication requirements
Solution Approach 1:
The patent segments the communication system into multiple independent carriers (component carriers), each operating independently with its own control channels and data channels. This allows the system to aggregate multiple narrowband carriers to achieve wideband communication while maintaining the simplicity of individual carrier operations, thus resolving the contradiction between bandwidth expansion and system complexity
Solution Approach 2:
The patent creates a universal carrier aggregation framework that can accommodate multiple carrier configurations and supports both legacy single-carrier operations and new multi-carrier operations. The system can dynamically activate or deactivate carriers based on service requirements, providing multi-functionality that spans from simple to complex operational modes
2Productivity
If multiple carriers are aggregated for wide bandwidth, then communication efficiency is improved, but control channel management becomes complex and resource allocation difficulty increases
Solution Approach 1:
The patent segments control channel functions by designating specific carriers as primary carriers that handle control channel transmissions, while secondary carriers focus on data transmissions. This segmentation of control and data functions across different carriers simplifies control channel management in multi-carrier systems while maintaining high communication efficiency
Solution Approach 2:
The patent introduces primary carriers as intermediary elements that mediate control channel transmissions between the network and user equipment. These primary carriers act as intermediaries that coordinate resource allocation and control signaling across multiple carriers, reducing the overall management complexity
3Area of stationary object
If carrier aggregation is implemented, then wideband communication is enabled, but backward compatibility with legacy systems may be affected
Solution Approach 1:
The patent designs a universal carrier aggregation framework that can operate in multiple modes: single-carrier mode for legacy compatibility and multi-carrier mode for enhanced performance. The system can dynamically adapt its operational mode based on network configuration and user equipment capabilities, ensuring backward compatibility while enabling wideband communication when needed
Solution Approach 2:
The patent implements dynamic carrier activation and deactivation mechanisms that allow the system to adapt its bandwidth usage based on service requirements. When legacy compatibility is needed, only a single carrier is activated; when wideband communication is required, multiple carriers are activated. This dynamic adaptation resolves the contradiction between bandwidth expansion and legacy compatibility
Data Source
AI summary
The method and device proposed by the present invention, in a carrier situation having a UE consisting of a plurality serving cells, change a serving cell used in transmitting uplink control information from a specific serving cell to a different serving cell under the control of a BS or the control of a UE. The present invention enables a faster and more flexible transmission/reception of the UL control information.