Carrier Aggregation ACK/NACK Mapping Across Component Carriers
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing control information transmission when multiple component carriers are used, particularly in terms of acknowledgement/negative-acknowledgement (ACK/NACK) and radio resource allocation.
Innovation Solution
A terminal is equipped with a receiver to handle multiple downlink component carriers, a controller to determine uplink channel elements for ACK/NACK transmission, and a transmitter to manage ACK/NACK and scheduling requests based on the number of bits, ensuring efficient resource allocation and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple component carriers are used for data transmission, then data transmission efficiency is improved, but control information management complexity increases
Solution Approach 1:
The patent segments control information into different types (ACK/NACK, scheduling requests, channel quality indicators) and assigns them to specific uplink component carriers based on their association with downlink component carriers. This segmentation allows systematic management of control information across multiple carriers, resolving the complexity issue while maintaining high data transmission efficiency.
Solution Approach 2:
The patent introduces an intermediary mapping relationship between downlink component carriers and uplink component carriers. Each downlink component carrier is associated with a specific uplink component carrier for control information feedback. This intermediary association simplifies the management of control information by establishing clear one-to-one or many-to-one relationships, reducing the overall system complexity.
2Reliability
If control information is transmitted on multiple uplink component carriers, then reliability of control information transmission is improved, but resource allocation complexity increases
Solution Approach 1:
The patent establishes preliminary associations between downlink component carriers and uplink component carriers before actual data transmission occurs. These associations are configured in advance through higher layer signaling, so that when control information needs to be transmitted, the appropriate uplink component carrier is already determined. This preliminary action eliminates the need for complex real-time resource allocation decisions, reducing complexity while maintaining reliable control information transmission.
3Quantity of substance
If ACK/NACK information is transmitted with scheduling requests in the same uplink channel element, then resource utilization is improved, but transmission reliability may deteriorate
Solution Approach 1:
The patent merges ACK/NACK information and scheduling requests into the same uplink channel element for transmission. By combining these control information types that are naturally associated with the same downlink component carrier, the system improves resource utilization by reducing the number of separate transmissions needed, while maintaining reliability through the unified transmission mechanism.
Data Source
AI summary
Provided is a data transmission system using a carrier aggregation. The data transmission system may assign a radio resource based on a correspondence relationship between a downlink and an uplink, and may transmit data using the assigned radio resource.