CSI Channel Coding for Carrier Aggregation Error Detection
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Solution Overview
Problem
In wireless communication systems, particularly in LTE standards, the increased number of component carriers for carrier aggregation leads to a rapid increase in bits required for UCI such as HARQ-ACK and CSI, making error detection and transmission challenging, which can have significant ripple effects if errors occur.
Innovation Solution
A method for channel coding of CSI that involves determining the number of input bits for a channel encoder based on individual CSI, CSI groups, PUCCH reporting types, and antenna ports, with padding and CRC masking to efficiently manage bit width and error detection across multiple CSI processes transmitted in a single subframe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of component carriers is increased for carrier aggregation, then the bandwidth and data transmission capacity are improved, but the number of bits for UCI (HARQ-ACK, CSI) increases rapidly, making error detection and transmission more challenging
Solution Approach 1:
The patent divides CSI reporting into multiple groups (first CSI group and second CSI group) with different priorities. High-priority CSI is transmitted in the first group while low-priority CSI is transmitted in the second group. This segmentation allows the system to maintain reliable transmission of critical channel state information even when the total number of CSI bits increases due to carrier aggregation.
Solution Approach 2:
The patent introduces CRC (cyclic redundancy check) masking as an intermediary error detection mechanism. By attaching CRC bits to CSI reports and using masking techniques, the system enables reliable error detection of UCI bits without requiring additional transmission resources. This intermediary mechanism resolves the contradiction by providing robust error detection capability despite the increased volume of UCI data.
2Adaptability or versatility
If the number of UCI bits (HARQ-ACK, CSI) is increased to support more component carriers, then the carrier aggregation capability is improved, but the complexity of error detection and transmission management increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and attaching CRC bits to CSI reports before transmission. The CRC masking is performed in advance on the UCI bits, allowing the receiver to efficiently detect errors without complex real-time processing. This preliminary error detection preparation reduces the complexity of managing error detection for large numbers of UCI bits.
Solution Approach 2:
The patent changes the parameter of CSI reporting by introducing different priority levels (first CSI group with high priority, second CSI group with low priority). This parameter change allows the system to manage the complexity of error detection by treating different CSI reports differently, focusing error detection resources on high-priority information while simplifying handling of low-priority information.
3Area of stationary object
If channel coding is performed on multiple CSI without bit width optimization, then the transmission coverage is improved, but the transmission efficiency and throughput are reduced due to excessive bit allocation
Solution Approach 1:
The patent optimizes bit width parameters by determining the actual number of bits required for each CSI report based on its priority and content. Instead of allocating fixed maximum bits to all CSI reports, the system dynamically adjusts bit allocation parameters. High-priority CSI in the first group receives appropriate bit allocation with CRC masking, while low-priority CSI in the second group uses reduced bit allocation, improving overall transmission efficiency.
Solution Approach 2:
The patent applies partial action by selectively applying full error detection (CRC masking) only to high-priority CSI reports in the first group, while using simplified or reduced error detection for low-priority CSI in the second group. This partial application of error detection measures maintains transmission coverage for critical information while improving throughput efficiency by reducing overhead for less critical information.
Data Source
AI summary
According to one embodiment of the present invention, a method for channel-coding channel state information (CSI) in a wireless communication system is performed by a terminal and comprises the steps of: determining the number of input bits for a channel encoder of multi-CSI, to be transmitted in one subframe, for a plurality of cells or CSI processes; and channel-coding input bits for the multi-CSI having the determined number of input bits, wherein the number of input bits of pieces of CSI determined for each individual CSI, for each CSI group, or for each physical uplink control channel (PUCCH) report type or PUCCH report mode.