Uplink Control Information Transmission via Bit Inversion and Repetition Coding
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Solution Overview
Problem
In wireless communication systems, particularly in LTE-A, the increased size of rank information due to extended antenna configurations and carrier aggregation poses challenges for efficient and correct transmission of uplink control information, especially in efficiently configuring and transmitting rank indicators.
Innovation Solution
A method involving repeated coding and bit inversion of information bits based on the number of 1s, followed by interleaving and modulation, is applied to transmit encoded bits through the physical uplink shared channel (PUSCH), optimizing the transmission of rank information and other control data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If extended antenna configuration and carrier aggregation are supported, then downlink transmission capacity is improved, but the size of rank information to be fed back increases
Solution Approach 1:
The patent extracts the rank indicator transmission from the conventional uplink control information framework and creates a dedicated feedback mechanism. By separating the RI feedback into a specific handling procedure with bit inversion and repetition coding, the system can manage the increased rank information size without overwhelming the uplink control channel capacity.
Solution Approach 2:
The patent applies bit inversion to the rank indicator feedback based on the number of 1s in the original bits. This inversion technique transforms the increased rank information into a format that can be efficiently transmitted and reliably decoded, converting the problem of large information size into a manageable signaling scheme.
2Reliability
If repeated coding is applied to N information bits, then transmission reliability is improved, but processing complexity increases
Solution Approach 1:
The patent changes the parameter of bit representation by applying inversion based on the count of 1s in the N information bits. This parameter transformation simplifies the repetition coding process while maintaining reliability, as the inverted bits can be systematically repeated and later decoded by the receiver knowing the inversion rule.
Solution Approach 2:
The bit inversion operation is performed preliminarily before repetition coding. By pre-processing the bits through inversion based on the 1s count, the system prepares the data in an optimal form for repetition, reducing the overall processing complexity during transmission while ensuring reliable delivery.
3Measurement precision
If detailed scheme is defined for rank indicator transmission, then transmission accuracy is improved, but system complexity increases
Solution Approach 1:
The patent implements a self-service mechanism where the transmission scheme automatically adapts to the rank indicator content. The bit inversion rule based on the number of 1s creates a self-regulating system that adjusts the encoding without requiring complex external control, thereby improving accuracy while limiting the growth of system complexity.
Solution Approach 2:
The patent introduces asymmetry in the feedback scheme by applying inversion only when the number of 1s meets certain criteria. This asymmetric treatment of different bit patterns allows for optimized accuracy for specific rank indicator values while keeping the overall system complexity manageable through rule-based differentiation.
Data Source
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AI summary
The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for transmitting uplink control information in a wireless communication system. A method for transmitting uplink control information in a wireless communication system according to one embodiment of the present invention comprises a step of repetition coding information bit of N-bit to generate an encoded bit; and a step of transmitting the encoded bit via a physical uplink shared channel, wherein bit inversion can be applied to the bit obtained by repeating the information bit of N-bit, on the basis of the number 1 contained in the information bit of N-bit.