ACK/NACK Payload Transmission in Carrier Aggregation Systems
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting control information, particularly in multiplexing and bundling multiple ACK/NACK information, which leads to inefficient use of transmission power and limited feedback capacity, especially with increasing numbers of component carriers and subframes.
Innovation Solution
The method involves configuring various transmission modes and channels to efficiently piggyback multiple ACK/NACK information on an uplink shared channel, using techniques such as increased modulation orders, channel coding, and multiplexing schemes like LTE PUCCH formats, and transmitting ACK/NACK information on PUSCH resources, allowing for more efficient power utilization and larger payload sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple ACK/NACK information are transmitted using conventional multiplexing and bundling methods, then feedback capacity is maintained, but transmission power efficiency deteriorates and payload capacity is limited
Solution Approach 1:
The patent combines multiple ACK/NACK information bits into a single uplink shared channel transmission by integrating them with uplink data, rather than using separate control channels. This merging approach allows efficient power utilization and increases payload capacity by transmitting control information alongside data in the PUSCH, resolving the contradiction between maintaining feedback capacity and improving power efficiency
Solution Approach 2:
The uplink shared channel is designed to serve dual purposes: transmitting both user data and control information (ACK/NACK feedback) simultaneously. This multi-functionality allows the same transmission resource to handle multiple types of information, improving power efficiency while maintaining comprehensive feedback capacity across multiple component carriers and subframes
2Reliability
If control information is transmitted separately from data, then control reliability is maintained, but transmission efficiency and power utilization deteriorate
Solution Approach 1:
The patent merges control information (ACK/NACK) with uplink data transmissions in the PUSCH, allowing both to be sent together in a single transmission. This combining maintains reliability through proper channel coding and resource allocation while significantly improving transmission efficiency and power utilization compared to separate control channel transmissions
3Productivity
If the number of component carriers and subframes increases, then system capacity is improved, but control information transmission complexity and power consumption increase
Solution Approach 1:
The uplink shared channel is designed to handle multiple ACK/NACK feedback bits from multiple component carriers and subframes simultaneously. By making the PUSCH universal for both data and control information transmission, the system can scale to support more carriers and subframes without proportionally increasing transmission complexity, as the same channel structure and processing methods are used regardless of payload size
Data Source
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AI summary
The present invention relates to a wireless communication system supporting carrier aggregation. More specifically, the present invention relates to a method in which a terminal transmits ACK/NACK and to a device therefor; and relates to a method comprising the steps of: receiving one or more items of data simultaneously on a plurality of carriers; generating an ACK/NACK payload comprising one or more items of ACK/NACK information about the one or more items of data; and transmitting the ACK/NACK payload, wherein the position of each item of ACK/NACK information in the ACK/NACK payload corresponds to respective carriers, and the present invention relates to a device for the method.