PUCCH Format 3 DFT Precoding Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting information, particularly in allocating resources for carrying increased uplink control information (UCI) in carrier aggregation scenarios, where existing PUCCH formats struggle to handle multiple DL CCs on a single UL CC, leading to limitations in ACK/NACK feedback and other control information transmission.
Innovation Solution
A new PUCCH format, referred to as PUCCH Format 3, is introduced, which employs DFT-based precoding and spreading with a time-domain orthogonal code, allowing for increased multiplexing capacity and efficient transmission of UCI, including ACK/NACK information, by distributing modulation symbols across multiple SC-FDMA symbols and using channel selection or enhanced channel selection techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If legacy PUCCH formats are used to transmit UCI in carrier aggregation scenarios, then the system maintains compatibility with existing structures, but the multiplexing capacity is insufficient to handle ACK/NACK feedback for multiple DL CCs
Solution Approach 1:
The PUCCH format is segmented into distinct functional components: DFT-based precoding stage, modulation stage, and orthogonal code spreading stage. This segmentation allows each component to be optimized independently for its specific function, enabling the system to handle increased UCI capacity without overwhelming complexity in any single stage.
Solution Approach 2:
The patent introduces a new dimension to PUCCH transmission by employing DFT-based precoding that distributes modulation symbols across multiple SC-FDMA symbols in the time domain. This dimensional expansion from traditional single-symbol transmission to multi-symbol distributed transmission increases multiplexing capacity while maintaining manageable complexity through structured signal processing.
2Quantity of substance
If multiple DL CCs are aggregated on a single UL CC, then the system supports broader bandwidth and increased data rates, but the existing PUCCH formats cannot efficiently transmit the increased UCI
Solution Approach 1:
The patent changes key transmission parameters including the use of DFT-based precoding matrices, modulation symbol distribution across multiple SC-FDMA symbols, and orthogonal code spreading factors. These parameter changes enable the PUCCH format to efficiently encode and transmit increased quantities of UCI related to multiple DL CCs, directly improving transmission efficiency while supporting broader aggregated bandwidth.
3Adaptability or versatility
If ACK/NACK feedback for multiple DL CCs is transmitted on a single UL CC, then the system supports carrier aggregation, but the feedback capacity is limited by legacy PUCCH formats
Solution Approach 1:
The patent applies preliminary channel selection and enhanced channel selection techniques that pre-process and organize ACK/NACK feedback information from multiple DL CCs before transmission. This preliminary organization and encoding of control information ensures that all necessary feedback is efficiently packed into the available PUCCH resources, preventing information loss while supporting carrier aggregation.
Solution Approach 2:
The DFT-based precoding and orthogonal code spreading act as intermediary processing stages that transform and encode the ACK/NACK feedback from multiple DL CCs into a format suitable for transmission on a single UL CC. These intermediary processes preserve all control information while adapting it to the transmission constraints, enabling full carrier aggregation support without information loss.
Data Source
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AI summary
The present invention relates to a wireless communication system and more specifically relates to a method and device for transmitting information. A wireless communication system can support carrier aggregation (CA). In one aspect of the present invention, a method, in which a terminal receives information from a base station in a wireless communication, comprises the steps of: receiving, from the base station, first information on the transmission method of a first channel; receiving the receiving the first channel, from the base station, via at least one serving cell formed in the terminal; and carrying out decoding on the first channel in accordance with the first information. Therein, the first channel is an enhanced physical downlink control channel (ePDCCH), and the terminal is capable of not carrying out decoding on the first channel in a frequency region in a present subframe.