PUCCH Format Using DFT-precoded OCs for Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting control information, particularly in Carrier Aggregation (CA) scenarios, where existing methods struggle to efficiently allocate resources for control information transmission, leading to limitations in handling increased amounts of uplink control information.
Innovation Solution
The proposed solution involves a new Physical Uplink Control Channel (PUCCH) format and signal processing method that uses DFT-precoded and spread signals with time-domain OCs, allowing for efficient resource allocation and increased multiplexing capacity, enabling the transmission of a larger amount of uplink control information across multiple carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing PUCCH formats are used for control information transmission in Carrier Aggregation, then the system maintains backward compatibility, but the multiplexing capacity and resource allocation efficiency are insufficient to handle increased amounts of uplink control information
Solution Approach 1:
The patent applies parameter changes by modifying the PUCCH format parameters, specifically using DFT-precoded orthogonal cover codes with length 4 or 5, and configuring specific resource element patterns for reference signals and control information. This allows the system to handle increased control information capacity while maintaining compatibility with existing SC-FDMA framework
Solution Approach 2:
The patent segments the uplink transmission by separating reference signals and control information into specific resource element patterns within the SC-FDMA resource blocks. This segmentation enables efficient multiplexing of multiple control information streams while maintaining individual signal integrity for each component carrier
2Quantity of substance
If more resource elements are allocated for control information transmission, then the uplink control information capacity increases, but the available resources for data transmission decrease
Solution Approach 1:
The patent implements dynamic resource allocation where the number of resource blocks and resource elements allocated to PUCCH can be adjusted based on the amount of control information that needs to be transmitted. This dynamic configuration allows the system to optimize the balance between control information capacity and data transmission resources
Solution Approach 2:
The patent creates a universal PUCCH format that can handle multiple types of control information (ACK/NACK, CQI, PMI, RI) from multiple component carriers simultaneously. This multi-functional approach consolidates what would otherwise require multiple separate transmission channels, improving overall resource utilization
3Adaptability or versatility
If DFT-precoded orthogonal cover codes are used for signal spreading, then the multiplexing capacity increases, but the signal processing complexity increases
Solution Approach 1:
The patent applies parameter changes by using specific DFT-precoded orthogonal cover codes of length 4 or 5, which provide sufficient multiplexing capacity for Carrier Aggregation scenarios. The patent also specifies particular orthogonal cover code patterns and resource element configurations that balance multiplexing capability with processing complexity
Solution Approach 2:
The patent uses orthogonal cover codes that are generated through systematic DFT-based spreading, where the same base sequence is copied and spread across multiple resource elements with different phase rotations. This systematic approach to code generation simplifies the processing complexity while maintaining high multiplexing capacity
Data Source
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AI summary
The present invention relates to a wireless communication system, more specifically to a method for transmitting control information and a device therefor. The wireless communication system can support carrier aggregation. The present invention relates to a method for transmitting information from a terminal to a base station in a wireless communication system, which includes a step for receiving first information for cross carrier scheduling through at least one primary cell among serving cells formed in a terminal from the base station, and a step for transmitting second information about a secondary cell related to at least one first information among serving cells to the base station through an uplink resource of the primary cell.