Uplink Control Information Encoding for Channel State Reporting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In 3GPP LTE wireless communication systems, the increased amount of uplink control information due to MIMO and carrier aggregation leads to restrictive radio resources and higher transmission errors, necessitating improved coding and power control for uplink channels.
Innovation Solution
A method and apparatus for reporting channel state information (CSI) that includes configuring CSI reporting periodicity and offset, determining subframes for transmission, encoding and modulating UCI with CSI, and transmitting it on the uplink channel, with specific handling for rank indicators and padding bits to manage payload size and reduce transmission errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If MIMO and carrier aggregation are introduced to increase channel capacity, then the amount of uplink control information increases, but radio resources become more restrictive and transmission errors increase
Solution Approach 1:
The patent segments uplink control information into different types (ACK/NACK, CSI, SR) and assigns them to different uplink channels (PUCCH, PUSCH) for transmission. This segmentation allows for optimized resource allocation and error handling for each type of control information, improving overall transmission reliability despite increased total control information volume.
Solution Approach 2:
The patent changes transmission parameters including power control settings, coding schemes, and modulation formats based on the type and amount of uplink control information. By dynamically adjusting these parameters, the system can maintain reliable transmission even as the volume of control information increases due to MIMO and carrier aggregation.
2Quantity of substance
If MIMO and carrier aggregation are introduced to increase channel capacity, then the amount of uplink control information increases, but radio resources become more restrictive
Solution Approach 1:
The patent merges multiple types of uplink control information (ACK/NACK, CSI, SR) onto a single uplink channel (PUSCH) when possible, reducing the total number of separate transmissions required. This merging approach optimizes radio resource utilization by consolidating control information transmission while still supporting the increased control information volume from MIMO and carrier aggregation.
Solution Approach 2:
The patent utilizes both time and frequency dimensions of radio resources more efficiently by assigning different control information types to different subframes and resource blocks. This multi-dimensional resource allocation allows the system to accommodate increased control information volume without proportionally increasing total resource consumption.
3Productivity
If CSI payload size varies according to RI, then coding efficiency improves, but complexity of determining and transmitting variable payload size increases
Solution Approach 1:
The patent performs preliminary determination of the RI value before CSI encoding, allowing the system to pre-establish the appropriate payload size and coding parameters. This preliminary action enables efficient variable-length coding without requiring complex real-time adjustments during transmission, reducing operational complexity while maintaining coding efficiency.
Data Source
AI summary
A method and device for reporting channel state information (CSI) is provided. A wireless device codes uplink control information (UCI) including CSI to create encoded UCI and transmits the encoded UCI. When the CSI includes a rank indicator (RI), the payload size of the CSI is determined according to the RI, and if the CSI does not include the RI, the payload size of the CSI is fixed.